Faculty Directory

Research in helicopter dynamics, Micro Air Vehicles & Drones and smart structures, Rotorcraft Design.

Journal Articles

2016

• Friedman, C., Chopra, I. and Rand, O., “Obstacle Avoidance and Targeted Flight for Rotary Wing MAVs in GPS Denied Environments,” Journal of the American Helicopter Society, Vol. 61, No. 1, January 2016, pp. 012009 (1-16).  
• Benedict, M., Coleman, D., Mayo, D. B. and Chopra, I., “Experiments on Rigid Wing Undergoing Hover-Capable Flapping Kinematics at Micro-Air-Vehicle-Scale Reynolds Numbers,” AIAA Journal, Vol. 54, No. 4, April 2016, pp. 1145-1171.  
• Benedict, M., Lakshminarayan, V., Pino, J. and Chopra, I., “Aerodynamic of a Small-Scale VerticalAxis Wind Turbine with Dynamic Blade Pitching,” AIAA Journal, Vol. 54, No. 3, March 2016, pp. 924-935.
• Ravichandran, K. and Chopra, I., “Open-Loop Control of Performance and Vibratory Loads Using Leading-Edge Slats,” Journal of the American Helicopter Society, Vol. 61, No. 3, July 2016, pp. 032003 (1-9).
• Bowen-Davies, G. M. and Chopra, I., “Performance and Loads Predictions of a Mach-Scaled Rotor at High Advance Ratios,” Journal of the American Helicopter Society, Vol. 61, No. 3, July 2016, pp. 032008 (1-11).  
• Shrestha, R., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Hover Performance of a Small-Scale Helicopter Rotor for Flying on Mars,” Journal of Aircraft, Vol. 53, No. 4, July-Aug 2016, pp. 11601167.
• Benedict, M., Jarugumilli, T. and Chopra, I., “Effects of Asymmetric Blade-Pitching Kinematics on Forward-Flight Performance of a Micro-Air-Vehicle-Scale Cycloidal-Rotor,” Journal of Aircraft, Vol. 53, No. 5, Sept-Oct 2016, pp. 1567-1572.
• Shrestha, E., Hrishikeshavan, V., Benedict M., Yeo, D. and Chopra, I., “Development of Control Strategies for a Twin-Cyclocopter in Forward Flight,” Journal of the American Helicopter Society, Vol. 61, No. 4, October 2016, pp. 042009 (1-9).
• Lankford, J., Mayo, D. and Chopra, I., “Computation Investigation of Insect-Based Flapping Wings for Micro Air Vehicle Applications,” International Journal of Micro Air Vehicles,” Vol. 8, No. 2, April 2016, pp. 64-78.

2015

• Hrishikeshavan, V., Benedict, M. and Chopra, I., “Identification of Flight Dynamics of a Cyclocopter Micro Air Vehicle in Hover,” Journal of Aircraft, Vol. 52, No. 1, Jan-Feb 2015, pp. 116-129.
• Mayo, D. B., Lankford, J. L., Benedict, M. and Chopra, I., “Aeroelastic Analysis of Avian-Based Flexible Flapping Wings for Micro Air Vehicles,” Journal of the American Helicopter Society, Vol. 60, No. 3, July 2015, pp. 032002 (1-18).
• Bowen-Davies, G. M. and Chopra, I., “Aeromechanics of a Slowed Rotor,” Journal of the American Helicopter Society, Vol. 60, No. 3, July 2015, pp. 032011 (1-13).
• Friedman, C., Chopra, I. and Rand, O., “Perimeter-Based Polar Scan Matching (PB-PSM) for 2D Laser Odometry,” Journal of Intelligent & Robotic Systems, Vol. 80, No. 2, Nov. 2015, pp. 231-254.
• Friedman, C., Chopra, I. and Rand, O., “Indoor/Outdoor Scan-Matching Based Mapping Technique with a Helicopter MAV in GPS-Denied Environment,” International Journal of Micro Air Vehicles, Vol. 7, No. 1, March 2015, pp. 55-70.

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2014

• Jarugumilli, T., Benedict, M. and Chopra, I., “Wind Tunnel Studies on a Micro Air Vehicle-Scale Cycloidal Rotor,” Journal of the American Helicopter Society, Vol. 59, No. 2, April 2014, pp. 02208 (1-10).
• Petricca, L., Hrishikeshavan, V., Ohickers, P. and Chopra, I., “Design, Fabrication and Test of an Embedded Lightweight Kinematic Autopilot (ELKA),” International Journal of Intelligent Unmanned Systems,” Vol. 2, No. 2, 2014, pp. 140-150.
• Hrishikeshavan, V., Black, J. and Chopra, I., “Design and Performance of a Quad-Shrouded Rotor Micro Air Vehicle,” Journal of Aircraft, Vol. 51, No. 3, May-June 2014, pp. 779-791.
• Benedict, M., Shrestha, E., Hrishikeshavan, V. and Chopra, I., “Development of a Micro Twin-Rotor Cyclocopter Capable of Autonomous Hover,” Journal of Aircraft, Vol. 51, No. 2, March-April 2014, pp. 672-675.
• Hrishikeshavan, V., Bogdanowicz, C. and Chopra, I., “Design, Performance and Testing of a Quad Rotor Biplane Micro Air Vehicle for Multirole Missions,” International Journal of Micro Air Vehicles, Vol. 6, No. 3, September 2014, pp. 155-174.
• Lind, A. H., Jarugmilli, T., Benedict, M., Lakashminarayan, V. K., Jones, A. and Chopra, I., “Flow Field Studies on a Micro-Air-Vehicle-Scale Cycloidal Rotor in Forward Flight,” Experiments in Fluids, Vol. 55, No. 12, Dec 2014, pp. 1826: 1-17
• Benedict, M., Jarugumilli, T., Lakashminaryayan, V. and Chopra, I., “Effect of Flow Curvature on Forward Flight Performance of a Micro-Air-Vehicle-Scale Cycloidal-Rotor,” AIAA Journal, Vol. 52, No. 6, June 2014, pp. 1159-1169.
• Hrishikeshavan, V., Humbert, J. S. and Chopra, I., “Controllability and Disturbance Gramian Analysis of a Shrouded Rotor Micro Air Vehicle,” AIAA Journal of Guidance, Control and Dynamics, Vol. 37, No. 5, 2014, pp. 1684-1691.

2013

• Ravichandran, K., Chopra, I., Wake, B. E. and Hein, B., “Trailing-Edge Flaps for Rotor Performance Enhancement and Vibration Reduction,” Journal of the American Helicopter Society, Vol. 58, No. 2, April 2013, pp. 022006-13.
• Benedict, M., Jarugumilli, T. and Chopra, I., “Effect of Rotor Geometry and Blade Kinematics on Cycloidal Rotor Hover Performance,” Journal of Aircraft, Vol. 50, No. 5, 2013, pp. 1340-52.
• Seshadri, P., Benedict, M. and Chopra, I., Understanding Micro Air Vehicle Flapping-Wing Aerodynamics Using Force and Flowfield Measurements,” Journal of Aircraft, Vol. 50, No. 4, 2013, pp. 1070-87.
• Jain, R., Yeo, H. and Chopra, I., “Investigation of Trailing-Edge Flap Gap Effects on Rotor Performance Using High Fidelity Analysis,” Journal of Aircraft, Vol. 50, No. 1, 2013, pp. 140-151.
• Benedict, M., Gupta, R. and Chopra, I., Design, Development, and Open-Loop Flight-Testing of a Twin-Rotor Cyclocopter Micro Air Vehicle,” Journal of the American Helicopter Society, Vol. 58, No. 4, October 2013, pp. 042005 (1-10).
• Zachary, H. A., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Design, Development, and Flight Test of a Small-Scale Cyclogyro UAV Utilizing a Novel Cam-Based Passive Blade Pitching Mechanism, International Journal of Micro Air Vehicles, Vol. 5, No. 2, June 2013, pp.  145-162.

2012

• Malhan, R., Benedict, M. and Chopra, I., “Experimental Studies to Understand the Hover and Forward Flight Performance of a MAV-Scale Flapping Wing Concept,” Journal of the American Helicopter Society, Vol. 57, No. 2, April 2012, pp. 022003-11.
• Hrishikeshavan, V. and Chopra, I., “Performance, Flight Testing of Shrouded Rotor Micro Air Vehicle in Edgewise Gust,” Journal of Aircraft, Vol. 49, No. 1, January 2012, pp. 193-205.
• Seshadri, P., Benedict, M. and Chopra, I., “A Novel Mechanism for Emulating Wing Kinematics,” Journal of Bioinspiration Biomemetics, Vol. 7, 2012, pp. 036017.

2011

• Benedict, M., Jarugumilli, T., and Chopra, I., "Experimental Optimization of MAV-Scale Cycloidal Rotor Performance," Journal of the American Helicopter Society, Vol. 56, No. 2, April 2011, pp. 022005-1-11.
• Harishikeshavan, V., Sirohi, J., Tishchenko, M. and Chopra, I., “Design, Development and Testing of a Shrouded Single Rotor Micro Air Vehicle with Anti-Torque Vanes,” Journal of the American Helicopter Society, Vol. 56, No. 1, January 2011, pp. 12008-11.
• Harishikeshavan, V., and Chopra, I., “Aeromechanics and Control of a Shrouded Rotor Micro Air Vehicle in Hover and in Edgewise Flow,” Journal of the American Helicopter Society, Vol. 56, No. 4, October 2011, pp. 042004-14.
• Abhishek, A., Ananthan, S., Baeder, J. and Chopra, I., “Prediction and Fundamental Understanding of Stall Loads in UH-60A Pull-Up Maneuver,” Journal of the American Helicopter Society, Vol. 56, No. 4, October 2011, pp. 042005-14.
• Benedict, M., Mattaboni, M., Chopra, I., and Masarati, P., “ Aeroelastic Analysis of a Micro-Air-Vehicle-Scale Cycloidal Rotor in Hover,” AIAA Journal, Vol. 49, No. 11, November 2011, pp. 2430- 43.

2010

• Roget, B. and Chopra, I., “Closed-Loop Test of a Rotor with Individually Controlled Trailing-Edge Flaps for Vibration Reduction,” Journal of the American Helicopter Society, Vol. 55, No. 1, January 2010, pp. 012009-1-12.
• Benedict, M., Ramasamy, M., Chopra, I. and Leishman, J. G., “Performance of Cyclocopter Concept for Micro Air Vehicle Applications,” Journal of the American Helicopter Society, Vol. 55, No. 2, April 2010, pp. 022-1-12.
• Abhishek, A., Datta, A., Ananthan, S. and Chopra, I., “Prediction and Analysis of Main Rotor Loads in Prescribed Pull-Up Maneuver,” Journal of Aircraft, Vol. 47, No. 4, July-Aug 2010, pp. 1197-15.
• Benedict, M., Ramasamy, M., and Chopra, I., "Improving the Aerodynamic Performance of Micro-Air-Vehicle-Scale Cycloidal Rotor: An Experimental Approach," Journal of Aircraft, Vol. 47, No. 4, July-Aug 2010, pp. 1117-25.
• Falls, J., Datta, A. and Chopra, I., “Design and Analysis of Trailing-Edge Flaps and Servotabs for Primary Control,” Journal of the American Helicopter Society, Vol. 55, No. 3, July 2010, pp. 032005-15.
• Jain, R. K., Yeo, H. and Chopra, I., “Computation Fluid Dynamics-Computational Structural Dynamics Analysis of Active Control of Helicopter Rotor for Performance Improvement,” Journal of the American Helicopter Society, Vol. 55, No. 4, October 2010, pp. 042004-14.
• Shen, J., Chopra, I. and Johnson, W., “Performance of Swashplateless Helicopter Rotor with Trailing-Edge Flaps for Primary Flight Control,” Journal of the American Helicopter Society, Vol. 55, No. 4, October 2010, pp. 042005-9.
• Jain, R. K., Yeo, H. and Chopra, I., “Examination of Rotor Loads due to On-Blade Active Controls for Performance Enhancement,” Journal of Aircraft, Vol. 47, No. 6, Nov.-Dec 2010, pp. 2049-2066.

2009

• Pereira, J. L. and Chopra, I., “Hover Tests of Micro Air Vehicle-Scale Shrouded Rotors, Part I: Performance Characteristics,” Journal of the American Helicopter Society, Vol. 54, No. 1, January 2009, pp. 012001-1 to 102001-28.
• Pereira, J. L. and Chopra, I., “Hover Tests of Micro Air Vehicle-Scale Shrouded Rotors, Part II: Flow-Field Measurements,” Journal of the American Helicopter Society, Vol. 54, No. 1, January 2009, pp. 012002-1 to 012002-26.
• Abhishek, A., Datta, A. and Chopra, I., “Prediction of UH-60A Structural Loads Using Multibody Analysis and Swashplate Dynamics,” Journal of Aircraft, Vol. 46, No. 2, March-April 2009, pp. 474-490.

2008

• Roget, B. and Chopra, I., Wind-Tunnel Testing of Rotor with Individually Controlled Trailing-Edge Flaps for Vibration Reduction,” Journal of Aircraft, Vol. 45, No. 3, May-June 2008, pp. 868-879.
• Bao, J., Nagaraj, V. T., Chopra, I. and Bernhard, A., “Wind Tunnel Testing of Five Sets Mach Scale Composite Tailored Rotor with Flap-Bending/Torsion Couplings for Vibration Reduction,” Journal of the American Helicopter Society, Vol. 53, No. 3, July 2008, pp. 215-225.
• Datta, A. and Chopra, I., “Prediction of the UH-60A Main Rotor Structural Loads Using Computational Fluid Dynamics/Comprehensive Analysis Coupling,” Journal of the American Helicopter Society, Vol. 53, No. 4, Oct. 2008, pp. 351-365.
• Singh, B. and Chopra, I., “Insect-Based Hover-Capable Flapping Wings for Micro Air Vehicles: Experiment and Analysis,” AIAA Journal, Vol. 46, No. 9, September 2008, pp. 2115- 2135.

2007

• Prahlad, H. and Chopra,I., “Modeling and Experimental Characterization of SMA Torsional Actuators,” Journal of Intelligent Material Systems and Structures, Vol. 18, No. 1, January 2007, pp. 29-38.
• Couch, R. and Chopra, I., “A Quasi-Static Model for NiMnGa Magnetic Shape Memory Alloy” Smart Material and Structures Journal, Vol. 16, No. 1, February 2007, pp. 11-21.
• Robbins, D. H. and Chopra, I., “The Effect of Discrete Layer Kinematics on the Global Response of Homogenous and Composite Plates with Multiple Actuator Pairs,” Journal of Intelligent Material Systems and Structures, Vol. 18, No. 3, March 2007, pp. 235-252.
• Robbins, D. H. and Chopra, I., “Quantifying the Local Kinematic Effect in Actuated Plates via Strain Energy Distribution,” Journal of Intelligent Material Systems and Structures, Vol. 18, No. 6, June 2007, pp. 569-589.
• Couch, R., Sirohi, J. and Chopra, I., “Development of a Quasi-Static Model of NiMnGa Magnetic Shape Memory Alloy” Journal of Intelligent Material Systems and Structures Vol. 18, No. 6, June 2007, pp. 611-622.
• Hein, B. R. and Chopra, I., “Hover Performance of a Micro Air Vehicle: Rotor at Low Reynolds number,” Journal of the American Helicopter Society, Vol. 52, No. 3, July 2007, pp. 254-262.
• Sirohi, J., Parsons, E. and Chopra, I., “Hover Performance of a Cycloidal Rotor for a Micro Air Vehicle,” Journal of the American Helicopter Society, Vol. 52, No. 3, July 2007, pp. 263-279.
• Robbins, D. H. and Chopra, I., “Modeling of Progressive Damage in the Adhesive Bond Layers of Actuated Plates,” Journal of Intelligent Material Systems and Structures Vol. 18, No. 9, September 2007, pp. 893-922.
• Datta, A., Nixon, M. and Chopra, I., “Review of Rotor Loads Prediction with the Emergence of Rotorcraft CFD,” Journal of the American Helicopter Society, Vol. 52, No. 4, October 2007, pp. 287-317.
• Brindejonc, A., Sirohi, J. and Chopra, I., “Design and Testing of an Autorotative Payload Delivery System,” Journal of the American Helicopter Society, Vol. 52, No. 4, October 2007, pp. 360-370.

2006

• Bao, J., Chopra, I. and Bernhard, A., “Development of Mach Scale Composite Tailored Rotors with Flap-Bending/Torsion Couplings for Vibration Reduction,” Journal of Aircraft, 2006.
• Datta, A. and Chopra, I., “Validation of Structural and Aerodynamic Modeling Using UH-60A Flight Test Data,” Journal of the American Helicopter Society, Vol. 51, No. 1, Jan 2006.

2005

• Sirohi, J.. Cadou, C. and Chopra, I., “Investigation of the Dynamic Characteristics of Piezohydraulic Actuator,” Journal of Intelligent Material Systems and Structures, Vol. 16, No. 6, June 2005, pp. 481-492.
• Singh, B. and Chopra, I., “Elastic Blade Whirl Flutter Stability Analysis for Two-Bladed Proprotor/Pylon Systems,” Journal of Aircraft, Vol. 42, No. 2, March-April 2005, pp. 519-527.
• Tarascio, M. J., Ramasamy, M., Chopra, I., and Leishman J. G., “Flow Visualization of Micro Air Vehicle Scaled Insect-Based Flapping Wings,” Journal of Aircraft, Vol. 42, No. 2, March-April 2005, pp. 385-390.
• Singh, B. and Chopra, I., “Elastic Blade Whirl Flutter Stability Analysis for Two-Bladed Proprotor/Pylon Systems,” Journal of Aircraft, Vol. 42, No. 2, March-April 2005, pp. 519-527.
• Tarascio, M. J., Ramasamy, M., Chopra, I., and Leishman J. G., “Flow Visualization of Micro Air Vehicle Scaled Insect-Based Flapping Wings,” Journal of Aircraft, Vol. 42, No. 2, March-April 2005, pp. 385-390.
• Sirohi, J., Cadou, C. and Chopra, I., “Investigation of the Dynamic Characteristics of Piezohydraulic Actuator,” Journal of Intelligent Material Systems and Structures, Vol. 16, No. 6, June 2005, pp. 481-492.

Submitted Journal Articles

• Couch, R. and Chopra, I., “Constitutive Model of NiMnGa Ferromagnetic Shape Memory Alloy Bars” Accepted for Publication in Smart Material and Structures Journal, 2006.
• Datta, A. and Chopra, I., “CFD/CSD Coupling for the Prediction of Rotor Vibratory Loads in High-speed Flight, Accepted for Publication in Journal of Aircraft, 2006.
• Robbins, D. H. and Chopra, I., "The Effect of Laminate Kinematic Assumptions on the Global Response of Actuated Plates," Accepted for Publication in Journal of Intelligent Material Systems and Structures, 2006.
• Prahlad, H. and Chopra,I., “Development of SMA Torsional Actuators for Active Twist Rotor Blades,” Accepted for Publication in Journal of Intelligent Material Systems and Structures, 2006.
• Sirohi, J. and Chopra, I., "Measurement of the Dynamic Response of Piezohydraulic Actuator," Accepted for Publication in Journal of Intelligent Material Systems and Structures, 2006.
• Shen, J., Yang, M. and Chopra, I., "Swashplateless Helicopter Rotor System with Active Trailing-Edge Flaps for Primary and Vibrations Controls", Accepted for Publication in the Journal of Aircraft, 2006.

Conference Proceedings

• Berry, B. and Chopra, I., “Wind Tunnel Testing of an Instrumented Rotor at High Advance Ratio,” AIAA SciTech Conference, Kissimmee, FL, January 2015, Paper AIAA-2015-0950.
• Bowen-Davies, G. and Chopra, I., “Aeromechanics of Slowed Rotor at High Advance Ratios,” AIAA SciTech Conference, Kissimmee, FL, January 2015, Paper AIAA-2015-0951.
• Schmaus, J. and Chopra, I., “Performance and Loads Prediction for High Advance Ration Coaxial Rotor,” AIAA SciTech Conference, Kissimmee, FL, January 2015, Paper AIAA-2015-1413.
• Shrestha, E., Yeo, D., Hrishikeshavan, V. and Chopra, I., “Autonomous Maneuvering of Cyclocopter Using Closed-Loop Motion Capture Feedback Controller,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Hrishikeshavan, V. and Chopra, I., “Refined Lightweight Inertial Navigation System for Micro Air Vehicle Applications,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Shrestha, R., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Performance of Small-Scale Martian Helicopter Rotor,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Winslow, J., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Design, Development, and Flight Testing of a High Endurance Micro Quad-Rotor Helicopter,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Shrestha, E., Martz, V., Chopra, I. and Benedict, M., “Design and Hover Testing of a 50-gram Meso-Cyclocopter,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Lankford, J., Mayo, D. and Chopra, I., “Experimental and Computational Investigation of an Insect-Based Flapping Wing for MAV Applications,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Coleman, D., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Design and Development of a Hover-Capable Two-Winged Flapping-Wing Micro Air Vehicle,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Chandler, AZ, January 2015.
• Benedict, M., Lakshminarayan, V. and Chopra, I., “Experimental and Computational Investigation of a Small-Scale Vertical Axis Wind Turbine with Dynamic Blade Pitching,” 71st Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2015.
• Coleman, D., Benedict, M. and Chopra, I., “Design, Development and Flight Testing of Robotic Hummingbird,” 71st Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2015.
• Schmaus  J. and Chopra, I., “Aeromechanics for a High Advance Ratio Coaxial Helicopter,” 71st Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2015.
• Staruk, W., Weiner, E. and Chopra, I., “CAD-Based 3-D Structural Dynamic Modeling of the Tilt Rotor Aeroacoustic Model (TRAM) Proprotor,” 71st Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2015.
• Shrestha, E., Hrishikeshavan, V., Yeo, D. and Chopra, I., “Flight Dynamics Modeling and System Identification of a Cyclocopter in Forward Flight,” 71st Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2015.
• Bogdanowicz, C., Hrishikeshavan, V. and Chopra, I., “Development of a Quad-Rotor Biplane MAV with Enhanced Roll Control Authority in Fixed Wing Mode,” 71st Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2015.pp
• Benedict, M., Winslow, J., Hasnain, Z. and Chopra, I., “Performance and Flow Field Measurements of a MAV-Scale Helicopter Rotor in Hover,” 70th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2014.
• Shrestha, E., Benedict, M. and Chopra, I., “Development of Control Strategies and Flight Testing of Twin-Cyclocopter in Forward Flight,” 70th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2014.
• Nagaraj, V. T. and Chopra, I., “Exploration of Novel Powerplant Architectures of Hybrid Electric Helicopters,” 70th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2014.
• Staruk, W., Chopra, I., and Datta, A., “Three-Dimensional CAD-Based Structural Modeling of Next Generation Rotor Dynamic Analysis,” 70th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2014.
• Mayo, D., Lankford, J. and Chopra, I., “Coupled CFD/CSD-Based Aeroelastic Analysis with Flowfield Measurements of Avian-Based Flexible Flapping Wings for MAV Applications,” 70th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2014.
• Hrishikeshavan, V., Bogdonowicz, C. and Chopra, I., “Performance and Testing of a Quad Rotor Biplane Micro Air Vehicle for Multi Role Missions,” AIAA SciTech, National Harbor, MD, April 2014.
• Bowen-Davier, G. and Chopra, I., “Validation of Rotor Performance and Loads at High Advance Ratio,” Fifth Decennial AHS Aeromechanics Specialists’ Conference, San Francisco, CA, January 2014.
• Mayo, D. B., Lankford, J. L., Benedict, M. and Chopra, I., “Experimental and Computational Aerodynamic Investigation of Avian-Based Rigid Flapping Wings for MAV Applications,” Fifth Decennial AHS Aeromechanics Specialists’ Conference, San Francisco, CA, January 2014.
• Berry, B. and Chopra, I., “High-Advance Ratio Wind Tunnel Testing of a Model Rotor with Pressure Measurements,” Fifth Decennial AHS Aeromechanics Specialists’ Conference, San Francisco, CA, January 2014.
• Berry, B. and Chopra, I., “Slowed Rotor Wind Tunnel Testing of an Instrumented Rotor at High Advance Ratio,” 40th European Rotorcraft Forum, Southampton, UK, Sept 2014.
• Bowen-Davies, G. and Chopra, I., “Performance and Loads Correlation of the UH-60 Rotor at High Advance Ratios,” 40th European Rotorcraft Forum, Southampton, UK, Sept 2014.
• Nagaraj, V. T. and Chopra, I., “Assessment of Power Sources and Electric Motors for Hybrid Electric Tiltrotors,” 40th European Rotorcraft Forum, Southampton, UK, Sept 2014.
• Campbell, R., Humbert, J. S., and Chopra I., “Maneuverability Comparison of Flybar and Flybarless Micro-Helicopters,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Scottsdale, AZ, January 2013.
• Hrishikeshavan, V., Humbert, J.S., and Chopra, I., "Controllability and Disturbance Gramian Analysis of a Shrouded Rotor Micro Air Vehicle in Hover” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Scottsdale, AZ, Jan. 2013.
• Zachary, H. A., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Development of a Hover-Capable Cyclogyro Utilizing a Novel Cam-Based Passive Blade Pitching Mechanism,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Scottsdale, AZ, January 2013.
• Benedict, M., Hrishikeshavan, V. and Chopra, I., “Development of 800 gram Quad-Cyclocopter Capable of Autonomous Hover,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Scottsdale, AZ, January 2013.
• Malhan, R., Lakshminarayan, V., Masarati, P., Baeder, J. and Chopra, I., “Investigation of Aerodynamics of Flexible Flapping Wings of MAV Applications,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Scottsdale, AZ, January 2013.
• Jarugumilli, T., Benedict, M. and Chopra, I., “Experimental Investigation of High Speed Flight Capability of the Revolutionary Cycloidal Rotor Concept,” AHS International Specialists’ Meeting on Unmanned Rotorcraft and Network Centric Operations, Scottsdale, AZ, January 2013.
• Benedict, M., Pino, J. and Chopra, I., “Fundamental Understanding of the Physics of a Small-Scale Vertical Axis Wind Turbine with Dynamic Blade Pitching: An Experimental and Computation Approach,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Boston, MA, April 2013.
• Malhan, R., Masarati, P., Baeder, J. and Chopra, I., “CFD-CSD Coupled Aeroelastic Analysis of Flexible Flapping Wings for MAV Applications,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Boston, MA, April 2013.
• Benedict, M., Coleman, D., Mayo, D. and Chopra, I., “Force and Flowfield Measurements of a Rigid Wing Undergoing Hover Capable Flapping and Pitching Kinematics in Air at MAV-Scale Reynolds Numbers,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Boston, MA, April 2013.
• Hrishikeshavan, V., Bagdonowicz, C. and Chopra, I., “Experimental Investigation of Performance of a Wing-Propeller System for a Quad-Rotor-Biplane Micro Air Vehicle,” 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Boston, MA, April 2013.
• Chopra, I., Copp, P. and Saxena, A., “Review of Helicopter Primary Control Using Smart Actuators,” 23rd International Conference on Adaptive Structures & Technologies, Nanjing, China, October 2013.
• Saxena, A. and Chopra, I., “Continued Work on Hover Testing of a Swashplateless Rotor with Compact Brushless Motor Actuated Flaps for Primary Control,” 69th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2013.
• Hrishikeshavan, H., Benedict, M. and Chopra, I., “Flight Dynamics Identification of a Cyclocopter Micro Air Vehicle in Hover,” 69th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2013.
• Berry, B. and Chopra, I., “High-Advance Ratio Wind Tunnel Testing of Two Mach-Scale Rotor Geometries,” 69th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2013.
• Bowen-Davies, G. and Chopra, I., “Correlation of the UH-60A Slowed Rotor Wind Tunnel Tests Using UMARC,” 69th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2013.
• Friedman, C., Rand, O. and Chopra, I., “Obstacle Avoidance and Targeted Flight for Rotary Wing MAVs,” 69th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2013.
• Jarugmilli, T., Lind, A. and Chopra, I., “Experimental and Computational Flow Field Studies of a MAV-scale Cycloidal Rotor in Forward Flight,” 69th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2013.
• Benedict, M., Shrestha, E., Hrishikeshavan, V. and Chopra, I., “Development of a 200 Gram Twin-Rotor Micro Cyclocopter Capable of Autonomous Hover,” AHS Future Vertical Lift Design Conference, San Francisco, January 2012.
• Harrington, A., Kalra, T., Milluzzo, J., Seshadri, P., Nagaraj, V. T. and Chopra, I., “Challenges in Rotor System and Hub Design for a Variable Diameter Tiltrotor,” AHS Future Vertical Lift Design Conference, San Francisco, January 2012.
• Ravichandran, K. and Chopra, I., “Active Control of Performance and Vibratory Loads Using Leading Edge Slats,” 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2012.
• Benedict, M., Jarugumilli, T. and Chopra, I., “ Studies to Understand the Role of Flow Curvature Effects on the Aerodynamic Performance of MAV-Scale Cycloidal Rotor in Forward Flight,” 53rd AIAA/ASME/ASCE/AHS/AC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2012.
• Malhan, R., Lakshminarayan, V., Masarati, P., Baeder, J. and Chopra, I., “CFD-CSD Coupled Aeroelastic Analysis of Flexible Flapping Wings for MAV Applications: Methodology Validation,” 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2012.
• Seshadri, P., Benedict, M. and Chopra, I., “Towards a Fundamental Understanding of Low Reynolds Number Hover-Capable Flapping Wing Aerodynamics,” 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2012.
• Hrishikeshavan, V., Black, J. and Chopra, I., “Design and Testing of a Quad Shrouded Rotor Micro Air Vehicle in Hover,” 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2012.
• Bowen-Davies and Chopra, I., “Aeromechanics of a Variable-Radius Rotor,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Kalra, T. S., Amiraux, M., Nagaraj, V. T. and Chopra, I., “A Comparative Study of Different Weight Formulations Affecting Preliminary Sizing of Rotorcraft,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Hrishikeshavan, V., Black, J. and Chopra, I., “Development of a Quad Shrouded Rotor Micro Air Vehicle and Performance Evaluation in Edgewise Flow,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Hrishikeshavan, V. and Chopra, I., “Design and Testing of a Dual Tilt-Wing Micro Air Vehicle,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Jarugumilli, T. , Benedict, M. and Chopra, I., “Experimental Investigation of the Forward Flight Performance of a MAV Scale Cycloidal Rotor,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Friedmann, C., Rand, O. and Chopra, I., “Highly Accurate SLAM for Rotary Wing MAVs,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Saxena, A. and Chopra, I., “Hover Testing of A Swashplateless Rotor with Compact Brushless Motor Actuated Flaps for Primary Control,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Berry, B. and Chopra, I., “Performance and Vibratory Loads of a Slowed Rotor at High Advance Ratios,” 68th Annual Forum of the American Helicopter Society, Fort Worth, TX, May 2012.
• Friedman, C., Chopra, I., Rand, O. and Kanza, Y., “Towards Obstacle Avoidance for Autonomous UAV Flying,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Bewak, D. and Chopra, I., “Design, Control, and Performance Verification of a Quad-Rotor MAV,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Harrington, A., Samuel, P. and Chopra, I., “Optimal Design Study of a Micro Quad-Rotor,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Malhan, R., Lakshminarayan, V., Baeder, J. and Chopra, I., “Investigation of Aerodynamics of Rigid Flapping Wings for MAV Applications: CFD Validations,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Benedict, M., Jarugumilli, T. and Chopra, I., “Experimental Investigation of the Effects of Rotor Geometry on the Performance of MAV-Scale Cycloidal Rotor,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Seshadri, P., Benedict, M. and Chopra, I., “Exploring the Insect-Based Aerodynamics for Micro-Air Vehicles,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Hrishikeshavan, V. and Chopra, I., “Performance and Rotor-Based Control of a Shrouded Rotor MAV in Edgewise Flow,” AHS International Specialists’ Meeting, Unmanned Rotorcraft Systems and Network-Centric Operations, Tempe, AZ, January 2011.
• Abhishek, A. and Chopra, I., “Validation of UTTAS Pull-Up Maneuver Using CFD/CSD Coupling” 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Denver, CO, April 2011.
• Saxena, A. and Chopra, I., “Development and Testing of a Swashplateless Rotor with Compact Brushless Motor Actuated Flaps for Primary Control,” 67th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2011.
• Bowen-Davies, G. and Chopra, I., “Aeromechanics of a Variable-Speed Rotor,” 67th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2011.
• Benedict, M., Gupta, R. and Chopra, I., “Design, Development and Flight Testing of a Twin-Rotor Cyclocopter Micro Air Vehicle,” 67th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2011.
• Sridharan, A., Celi, R. and Chopra, I., “On the Role of Aerodynamic Nonlinearities in Helicopter Sling Load Operations,” 67th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2011.
• Berry, B. and Chopra, I., Wind Tunnel Testing for Performance and Vibratory Loads of a Variable-Speed Mach-Scale Rotor,” 67th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2011.
• Ravichandran, K., Chopra, I., Wake, B. E. and Hein, B., “Active Flaps and Slats for Rotor Performance Enhancement,” 67th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2011.
• Gilad, M., Chopra, I. and Rand, O., “Experiments and Theoretical Study of a Flexible Rotor in Extreme Ground Effect,” 37th European Rotorcraft Forum, Gallarate, Italy, September 2011.
• Friedman, C., Chopra, I., Potyagaylo, S., Rand, O. and Kanza, Y., “Towards Model-Free SLAM Using a Single Laser Range Scanner for Helicopter MAV,” AIAA Guidance, Navigation, and Control Conference, Portland, Oregon, August 2011.
• Jain, R., Yeo, H. and Chopra, I., “An Examination of Dynamic Loads due to On-Blade Active Controls for Performance Enhancement using CFD/CSD Analysis,” American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 2010.
• Hrishikeshavan, V. and Chopra, I., “Development of Closed Loop Flight Control for a Shrouded Rotor Micro Air Vehicle with Anti-Torque Vanes,” American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 2010.
• Benedict, M., Jarugumilli, T. and Chopra, I. “ Experimental Performance Optimization of a MAV-Scale Cycloidal Rotor,” American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 2010.
• Ravichandran, K., Ananthan, S., Chopra, I. and Hein, B., “Active Rotor Controls for Vibration Reduction and Performance Enhancement,” American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 2010.
• Malhan, R., Benedict, M. and Chopra, I., “Experimental Investigation of an Avian-Based Flapping Wing Concept in Hover and Forward Flight for Micro Air Vehicle Applications,” 66th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2010.
• Abhishek, A., Ananthan, S., Baeder, J. and Chopra, I., “Prediction and Fundamental Understanding of Stall Loads in UH-60A Pull-Up Maneuver,” 66th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2010.
• Hrishikeshavan, V. and Chopra, I., “Flight Testing and Closed Loop Control of a Shrouded Rotor Micro Air Vehicle with Anti Torque Vanes,” 66th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 2010.
• Benedict, M., Mattaboni, M., Chopra, I., and Masarati, P., "Aeroelastic Analysis of a MAV-Scale Cycloidal Rotor," 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Orlando, FL, April 2010.
• Mattaboni, M., Benedict, M., Masarati, P., and Chopra, I., " MAV-Scale Cycloidal Rotor Multibody Aeroelastic Analysis," Presented at the First Joint International Conference on Multibody System Dynamics, May  2010, Lappeenranta, Finland.
• Chopra, I., “Hovering Micro Air Vehicles: Challenges and Opportunities,” AHS International Meeting on Advanced Rotorcraft Technology and Safety Operations, Heli Japan 2010, Sonic City Omiya, Japan, November 2010.
• Falls, J., Datta, A. and Chopra, I., “An Examination of the Effect of Trailing Edge Flaps on Swashplateless Rotor Performance and Wake,” 36th European Rotorcraft Forum, Paris, France, September 2010.
• Abhishek, A., Chopra, I., Wang, G., Phan, N. and Liebschutz, “Rotor Loads Prediction Using Estimated Modal Participation from Sensors,” 36th European Rotorcraft Forum, Paris, France, September 2010.
• Copp, P. and Chopra, I., “Mach Scale Swashplateless Rotor Using Piezobender-Actuated Trailing Edge Flaps for Primary Control,” 21st International Conference on Adaptive Structures and Technologies, Penn State University, October 2010.
• Hrishikeshavan, V. and Chopra, I., “Development of Closed Loop Flight Control for a Shrouded Rotor Micro Air Vehicle with Anti-Torque Vanes,” AHS International Specialists’ Meeting Unmanned Rotorcraft Systems, Scottsdale, AZ, January 2009.
• Benedict, M., Chopra, I., Ramassamy, M. and Leishman, G. J., “Experiments of Optimization of MAV-Scale Cycloidal Rotor Characteristics towards Improving their Aerodynamic Performance,” AHS International Specialists’ Meeting Unmanned Rotorcraft Systems, Scottsdale, AZ, January 2009.
• Seshadri, P., Benedict, M. and Chopra, I., “Understanding Insect-Based Flapping Flight from Micro Air Vehicle Perpective,” AHS International Specialists’ Meeting Unmanned Rotorcraft Systems, Scottsdale, AZ, January 2009.
• Abhishek, A., Datta, A. and Chopra, I., Comprehensive Analysis, Prediction, and Validation of UH-60A Blade Loads in Unsteady Maneuvering Flight,” 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Palm Springs, CA, May 2009, AIAA-2009-2466.
• Benedict, M., Tarugumilli, T. and Chopra, I., “Design and Development of Hover-Capable Cyclocopter Micro Air Vehicle,” 65th Annual Forum of the American Helicopter Society, Grapevine, TX, May 2009.
• Pereira, J., Bawek, D., Westfall, S. and Chopra, I., “Design and Development of a Quad-Shrouded-Rotor Micro Air Vehicle,” 65th Annual Forum of the American Helicopter Society, Grapevine, TX, May 2009.
• Jain, R., Szema, K., Munipalli, R., Yeo, H. and Chopra, I., “Coupled CFD/CSD Prediction of the Effects of Leading Edge Slat on Rotor Performance,” 65th Annual Forum of the American Helicopter Society, Grapevine, TX, May 2009.
• Silbaugh, B., Abhishek, A., Ananthan, S., Baeder, J. and Chopra, I., Aerodynamic and Structural  Rotor Loads During Maneuvering Flight using Coupled CFD/CSD Analysis,” 65th Annual Forum of the American Helicopter Society, Grapevine, TX, May 2009.
• Sirohi, J. and Chopra, I., “Overview of Piezoelectric Actuator and Sensor Technology,” International Conference on Adaptive Structures and Technologies, Hong Kong, October 2009.
• Hrishikehavan, V. and Chopra, I., “Design, Development and Flight Testing of a Shrouded Rotor Micro Air Vehicle with Anti-Torque Vanes,” 3rd International Basic Research Conference on Rotorcraft Technology, Nanjing, China, October 2009.
• Abhishek, A., Silbaugh, B., Ananthan, S., Baeder, J. and Chopra, I., “CFD/CSD Analysis of a Prescribed Pull-up Maneuver,” 3rd International Basic Research Conference on Rotorcraft Technology, Nanjing, China, October 2009.
• Jung, S. N., Park, I., Nagaraj, V. T. and Chopra, I., “Structural Dynamics Analysis of Thin-Walled, Pretwisted Composite Blades with Spanwise Taper,” 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Schaumburg, Illinois, April 2008.
• Abhishek, A., Chopra, I., and Datta, A., “Comprehensive Analysis, Prediction, and Validation of UH-60A Blade Loads in Unsteady Maneuvering Flight,” AHS Specialists’ Conference on Aeromechanics, San Francisco, January 2008.
• Falls, J., Chopra, I. and Datta, A., “Performance Analysis of Trailing-Edge Flaps in Helicopter Primary Control,” AHS Specialists’ Conference on Aeromechanics, San Francisco, January 2008.
• Hrishkeshavan, V. and Chopra, I., “Design and Testing of a Shrouded Rotor Micro Air Vehicle with Anti Torque Vanes,” 64th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2008.
• Copp, P. and Chopra, I., “Continued Development of a Mach Scale Swashplateless Rotor with Integrated Trailing Edge Flaps,” 64th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2008.
• Benedict, M., Chopra, I., Ramasamy, M., and Leishman, J. G., “Experimental Investigation of the Cycloidal-Rotor Concept for a Hovering Micro Air Vehicle,” 64th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2008.
• Medic, C., Nagaraj, V., Chopra, I., “Novel Rotorcraft Automated Blade Fold and Secure Design,” 64th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2008.
• Nagaraj, V. and Chopra, I., “Design of Helicopter Based Urban Disaster Rescue Module,” 64th Annual Forum of the American Helicopter Society, Montreal, Canada, May 2008.
• Chopra, I., “Rotor-Based Micro Air Vehicles: Challenges & Opportunities,” 1st US-Asian Demonstration and Assessment of Micro-Aerial and Unmanned Ground Vehicles Technologies, Agra, India, March 2008.
• Copp, P. and Chopra, I., “Piezobimorph Actuated Trailing Edge Flaps for Primary Helicopter Control,” International Conference on Adaptive Structures and Technologies, Ascona, Switzerland, October 2008.
• Harishikeshavan, V., Sirohi, J., Tishchenko, M. and Chopra, I., “Design of a Shrouded Rotor Micro Air Vehicle wit Anti-Torque Vanes,” AHS International Specialists’ Meeting on Unmanned Rotorcraft, Chandler, AZ, January 2007.
• Pereiera, J. and Chopra, I., “Forward Flight Performance Measurements of a Shrouded Rotor for MAV Applications,” AHS International Specialists’ Meeting on Unmanned Rotorcraft, Chandler, AZ, January 2007.
• Benedict, M., Sirohi, J. and Chopra, I., “Design and Testing of a Cycloidal-Rotor MAV,” AHS International Specialists’ Meeting on Unmanned Rotorcraft, Chandler, AZ, January 2007.
• Fitchett, B. and Chopra,I., “A Biological Inspired Flapping Rotor for Micro Air Vehicles,” AHS International Specialists’ Meeting on Unmanned Rotorcraft, Chandler, AZ, January 2007.
• Gupta, N., Copp, P. and Chopra, I., “Flight Dynamics Model for Pitch and Heave Motion of a Rotary Wing Micro Air Vehicle,” AHS International Specialists’ Meeting on Unmanned Rotorcraft, Chandler, AZ, January 2007.
• Singh, B. and Chopra, I., “Aeroelastic Analysis of Insect-Based Hover-Capable Flapping Wings,” AHS International Specialists’ Meeting on Unmanned Rotorcraft, Chandler, AZ, January 2007.
• Falls, J., Datta, A. and Chopra, I., “Design and Analysis of Trailing-Edge Flaps and Servotabs for Primary Control,” Proceedings of 63rd Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2007.
• Abhishek, A., Datta, A. and Chopra, I., “Comprehensive Analysis, Prediction, and Validation of UH-60A Blade Loads in Unsteady Maneuvering Flight,” Proceedings of 63rd Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2007.
• Pereira, J. and Chopra, I., “Performance and Surface Measurements on a MAV-Scale Shrouded Rotor in Translational Flight,” Proceedings of 63rd Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2007.
• Singh, B. and Chopra, I., “An Aeroelstic Analysis for the Design of Insect-Based Flapping Wings,” AIAA 2007-1757, 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2007.
• Nagaraj, V. T. and Chopra, I., “Analysis of Elastically Coupled Non-Uniform Thin-Walled Composite Beams with Pre-Twist and Taper,” AIAA 2007-2261, 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Honolulu, Hawaii, April 2007.
• Allen, K., Sirohi, J. and Chopra, I., “Development of a Mach-Scaled Swashplateless Rotor with Embedded Trailing-Edge Flaps,” 33rd European Rotorcraft Forum, Kazan Russia, Sept 2007.
• Chopra, I., “Hovering Micro Air Vehicles: Challenges and Opportunities,” Proceedings of American Helicopter Society Specialists’ Conference, International Forum on Rotorcraft Multidisciplinary Technology, October 15-17, 2007, Seoul, Korea
• Jung, S. N., Park, I., Yu, H. Y., Nagaraj, V. T. and Chopra, I., “Theory of Thin-Walled, Pretwisted Composite Blades,” Proceedings of American Helicopter Society Specialists’ Conference, International Forum on Rotorcraft Multidisciplinary Technology, October 15-17, 2007, Seoul, Korea.
• Bao, J., Falls, J. and Chopra, I., “Development of a Swashplateless Rotor,” Proceedings of 2nd International Basic Research Conference on Rotorcraft Technology, Nanjing, China, November 2005
• Robbins, D. H. and Chopra, I., “The Effect of Laminate Kinematic Assumption on the Global Response of Actuated Plates,” 16th International Conference on Adaptive Structures and Technologies, Paris, France, October 2005.
• Datta, A., Nixon, M. and Chopra, I., “Prediction of Rotor Loads with the Emergence of Rotorcraft CFD,” Proceedings of 31st European Rotorcraft Forum, Italy, September 2005.
• Datta, A. and Chopra, I., “Prediction of UH-60A Dynamic Stall Loads in High Altitude Level Flight Using CFD/CSD Coupling,” Proceedings of 61st Annual Forum of the American Helicopter Society, Grapevine, TX June 2005.
• Nagaraj, V. and Chopra, I., “Assessment of Helicopter Wire Strike Accidents and Safety Warning and Protection Devices,” Proceedings of 61st Annual Forum of the American Helicopter Society, Grapevine, TX June 2005.
• Roget, B. and Chopra, I., “Closed-Loop Test of a Rotor with Individually Controlled Trailing-Edge Flaps for Vibration Reduction,” Proceedings of 61st Annual Forum of the American Helicopter Society, Grapevine, TX June 2005.
• Falls, J. and Chopra, I., Piezobimorph Actuated Servotab for Controlling a Trailing-Edge Flap for Rotor Vibration Suppression,” AIAA-2005-1961, 13th AIAA/ASME/AHS Adaptive Structures Conference, Austin, TX, April 2005.
• Singh, B. and Chopra, I., “Aerodynamics of Insect-Based Flapping Wings for Micro Hovering Air Vehicles,” AIAA-2005-2293,” 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Austin, TX, April 2005.
• Couch, R. N. and Chopra, I., “Quasi-Steady Modeling of NiMnGa Magnetic Shape Memory Alloy,” SPIE's 12th Annual International Symposium on Smart Structures and Materials, San Diego, Calif., March 2005.
• Ellison, J, Sirohi, J. and Chopra, I., “Comparison of Piezoelectric and Magnetostrictive Hydraulic Hybrid Actuators,” SPIE's 12th Annual International Symposium on Smart Structures and Materials, San Diego, Calif., March 2005.
• Hein, B. and Chopra, I., "Hover Performance of a Micro Air Vehicle: Rotor at Low Reynolds Number," AHS International Specialists' Meeting on Unmanned Rotorcraft: Design, Control and Testing, Phoenix, AZ, January 2005.
• Pereira, J. and Chopra, I.. "An Investigation of the Effects of Shroud Design Variables on the Hover Performance of a Shrouded-Rotor Micro Air Vehicles," AHS International Specialists' Meeting on Unmanned Rotorcraft: Design, Control and Testing, Phoenix, AZ, January 2005.
• Singh, B., Chopra, I., Ramasamy, M. and Leishman, J. G., "Insect-Based Flapping Wings for Micro Hovering Air Vehicles: Experimental Investigation," AHS International Specialists' Meeting on Unmanned Rotorcraft: Design, Control and Testing, Phoenix, AZ, January 2005.
• Parson, E., Sirohi, J. and Chopra, I., "Micro Air Vehicle: Cycloidal Rotor Concept," AHS International Specialists' Meeting on Unmanned Rotorcraft: Design, Control and Testing, Phoenix, AZ, January 2005.
• Sirohi, J., Tishchenko, M. and Chopra, I., “Design and Testing of a Micro-Aerial Vehicle with a Single Rotor and Turning Vanes,” Proceedings of 61s Annual Forum of the American Helicopter Society, Grapevine, TX June 2004.
• Brindejonc, A., Sirohi, J. and Chopra, I., “Design and Flight Testing of an Autonomous Payload Delivery System: The Autobody,” Proceedings of 61st Annual Forum of the American Helicopter Society, Grapevine, TX June 2004.