Publications: Recent Journals

 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000
Archives

2017

  1. Saxena, A. and Chopra, I., “Design, Development and Hover Testing of a Mach-Scale Swashplateless Rotor Using Brushless DC Motor-Actuated Trailing Edge Flaps for Rotor Primary Conttol,” Journal of the American Helicopter Society, Vol. 62, No. 2, April 2017, pp. 022002 (1-12).
  2. Shrestha, E., Yeo, D., Benedict, M. and Chopra, I., “Development of a Meso-Scale Cycloidal-Rotor Aircraft for Micro Air Vehicle Application,” International Journal of Micro Air Vehicles, 9, No. 2, May 2017, pp. 1-14.
  3. Coleman, D., Benedict, M., Hrishikeshavan, V. and Chopra, I., “Development of a Robotic Hummingbird Capable of Controlled Hover,” Journal of the American Helicopter Society, Vol. 62, No. 3, July 2017, pp. 032003 (1-9).
  4. Hrishikeshavan, V. and Chopra, I, “Refined Lightweight Inertial Navigation System for Micro Air Vehicle Applications,” International Journal of Micro Air Vehicles, 9, No. 2, May 2017, pp. 124-135.
  5. Schmaus, J. H. and Chopra, I., “Aeromechanics of Rigid Coaxial Rotor Models for Wind-Tunnel Testing,” Journal of Aircraft, Vol. 54, No. 4, July-August 2017, pp. 1486-1497.

2016

  1. 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.
  2. Benedict, M., Lakshminarayan, V., Pino, J. and Chopra, I., “Aerodynamic of a Small-Scale Vertical-Axis Wind Turbine with Dynamic Blade Pitching,” AIAA Journal, Vol. 54, No. 3, March 2016, pp. 924-935.
  3. Ravichandran, K. and Chopra, I., “Open-Loop Control of Performance and Vibratory Loads Using Leading-Edge Slats,” Journal of the American Helicopter Society, 61, No. 3, July 2016, pp. 032003 (1-9).
  4. 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).
  5. 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. 1160-1167.
  6. 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.
  7. 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, 61, No. 4, October 2016, pp. 042009 (1-9).
  8. 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

  1. 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.
  2. 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).
  3. 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).
  4. Mayo, D. B., Lankford, J. L., Benedict, M. and Chopra, I., “Experimental and Computational Analysis of Rigid Flapping Wings for Micro Air Vehicles,” Journal of Aircraft, Vol. 52, No. 4, July 2015, pp. 1161-78.
  5. Benedict, M., Winslow, J., Hasnain, Z. and Chopra, I., “Experimental Investigation of Micro Air Vehicle Scale Helicopter Rotor in Hover,” International Journal of Micro Air Vehicles,” 7, No. 3, Sept. 2015, pp. 231-256.
  6. 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.
  7. 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.

2014

  1. 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).
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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
  7. 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.
  8. 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

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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).
  6. 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

  1. 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.
  2. 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.
  3. Seshadri, P., Benedict, M. and Chopra, I., “A Novel Mechanism for Emulating Wing Kinematics,” Journal of Bioinspiration Biomemetics, Vol. 7, 2012, pp. 036017.

2011

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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
  8. 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

  1. 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.
  2. 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.
  3. 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

  1. 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.
  2. 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.
  3. 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.
  4. 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

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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

  1. 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, pp. 43-58.
  2. Robbins, D. H. and Chopra, I., “The Effect of Laminate Kinematic Assumptions on the Global Response of Actuated Plates,” Journal of Intelligent Material Systems and Structures, Vol. 17, No. 4, April 2006, pp. 273-299.
  3. Shen, J., Yang, M. and Chopra, I., “Swashplateless Helicopter Rotor with Active Trailing-Edge Flaps for Flight and Vibration Control”, Journal of Aircraft, Vol. 43, No. 2, March-April 2006, pp. 346-352.
  4. Bao, J., Nagaraj, V. T., Chopra, I. and Bernhard, A., “Development of Mach Scale Rotors with Tailored Composite Couplings for Vibration Reduction,” Journal of Aircraft, Vol. 43, No. 4, July-August 2006, pp. 922-931.
  5. Datta, A., Sitaraman, J, Chopra, I. and Baeder, J. D., “CFD/CSD Prediction of Rotor Vibratory Loads in High Speed Flight,” Journal of Aircraft, Vol. 43, No. 6, Nov.-Dec 2006, pp. 1698-1709.

2005

  1. 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.
  2. 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.
  3. 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.

2004

  1. Shen, J. and Chopra, I., “A Parametric Design Study for a Swashplateless Helicopter Rotor with Trailing-Edge Flaps,” Journal of the American Helicopter Society, Vol. 49, No. 1, January 2004, pp. 43-53.
  2. Shen, J. and Chopra, I., “Swashplateless Helicopter Rotor with Trailing-Edge Flaps,” Journal of Aircraft, Vol. 41, No. 2, March-April 2004, pp. 208-214.
  3. Yang, M., Chopra, I. and Haas, D. J., “Vibration Prediction for a Rotor System with Faults Using Coupled Rotor-Fuselage Model,” Journal of Aircraft, Vol. 41, No. 2, March-April 2004, pp. 348-358.
  4. Yang, M., Chopra, I. and Haas, D. J., “Sensitivity of Rotor-Fault-Induced Vibrations to Operational and Design Parameters,” Journal of the American Helicopter Society, Vol. 49, No. 3, July 2004, pp. 328-339.
  5. Datta, A. and Chopra, I., “Validation and Understanding of UH-60 Vibratory Loads in Steady Level Flight,” Journal of the American Helicopter Society, Vol. 49, No. 3, July 2004, pp. 271-287.
  6. Epps, J. and Chopra, I., “Methodology for In-flight Tracking of Helicopter Rotor Blades Using Shape Memory Alloy Actuators,” Journal of the American Helicopter Society, Vol. 49, No. 2, April 2004, pp. 192-200.
  7. Shen, J. and Chopra, I., “Aeroelastic Modeling of Trailing-Edge-Flap Helicopter Rotors Including Actuator Dynamics,” Journal of Aircraft, Vol. 41, No. 6, Nov.-Dec. 2004, pp. 1465-1472.

2003

  1. Chopra, I., “Review of State-of-Art of Smart Structures and Integrated Systems,” AIAA Journal, Vol. 40. No. 11, November 2002, pp. 2145-2187.
  2. Tishchenko, M. N., Nagaraj, V. T. and Chopra, I., “Unmanned Transport Helicopters,” Journal of the American Helicopter Society, Vol. 48, No. 2, April 2003, pp. 71-79.
  3. Singh, B. and Chopra, I., “Whirl Flutter Stability for Two-Bladed Proprotor/Pylon System in High Speed Flight,” Journal of the American Helicopter Society, Vol. 48, No. 2, April 2003, pp. 99-107.
  4. Sirohi, J. and Chopra, I., “Design and Testing of a High Pumping Frequency Piezoelectric hydraulic Hybrid Actuator,” Journal of Intelligent Material Systems and Structures, Vol. 14, No. 3, March 2003, pp. 135-148.
  5. Prahlad, H. and Chopra, I., “Development of Strain-Rate Dependent Model for Uniaxial Loading of SMA Wires,” Journal of Intelligent Material Systems and Structures, Vol. 14, No. 5, July 2003, pp. 429-442.
  6. Roget, B. and Chopra, I., “Individual Blade Control Methodology of a Rotor with Dissimilar Blades,” Journal of the American Helicopter Society, Vol. 48, No. 3, July 2003, pp. 176-185.
  7. Shen, J. and Chopra, I., “Aeroelastic Stability of Trailing-Edge Flap Helicopter Rotors,” Journal of the American Helicopter Society, Vol. 48, No. 4, October 2003, pp. 236-243.
  8. Singh, K., Sirohi, J. and Chopra, I., “An Improved Shape-Memory Alloy Actuator for Rotor Blade Tracking,” Journal of Intelligent Material Systems and Structures, Vol. 14, No. 12, December 2003, pp. 767-786.

2002

  1. Roget, B. and Chopra, I., “Robust Individual Blade Control Algorithm for a Dissimilar Rotor,” Journal of Guidance, Control and Dynamics, Vol. 25, No. 5, Sept. Oct. 2002, pp. 915-923.
  2. Bernhard, A. P. F. and Chopra, I., “Hover Test of Mach-Scale Rotor-Model with Active Blade Tips,” Journal of the American Helicopter Society, Vol. 47, No. 4, Oct. 2002, pp. 273-284.
  3. Koratkar, N. and Chopra, I., “Wind Tunnel Testing of a Smart Rotor Model with Trailing-Edge Flaps,” Journal of the American Helicopter Society, Vol. 47, No. 4, Oct. 2002, pp. 263-272.
  4. Jung, S. N., Nagaraj, V. T. and Chopra, I., “A General Structural Model for Thin- and Thick-Walled Composite Blades with Elastic Couplings,” AIAA Journal, Vol. No. 1, January 2002, pp. 105-116.
  5. Spencer, M. G., Sanner, R. M. and Chopra, I., “Closed-Loop Neuro-Controller Tests on Piezoactuated Smart Rotor Blades in Hover,” AIAA Journal, Vol. 40 No. 8, Aug. 2002, pp. 1596-1602.
  6. Koratkar, N. A. and Chopra, I., “Open-Loop Hover Testing of Smart Rotor Model,” AIAA Journal, Vol. 40 No. 8, Aug. 2002, pp. 11495-1502.
  7. Bernhard, A. P. F. and Chopra, I., “Hover Test Mach-Scale Active-Twist Rotor using Piezo-Bending-Torsion Actuators,” Journal of Aircraft, Vol. 34, No. 4, July-August 2002, pp. 678-688.

2001

  1. Jung, S. N., Nagaraj, V. T. and Chopra, I., “Refined Structural Dynamics Model for Composite Rotor Blades,” AIAA Journal, Vol. 39, No. 2, February 2001, pp. 339-348.
  2. Yeo, H. and Chopra, I., “Effect of Modeling Refinements on Coupled Rotor/Fuselage Vibration Analysis,” Journal of Aircraft, Vol. 38, No. 1, Jan. –Feb. 2001, pp. 111-121.
  3. Epps, J. J. and Chopra, I., “In-Flight Tracking of Helicopter Rotor Blades Using Shape Memory Alloy Actuators,” Structures Smart Material and Structures, Vol. 10, No. 1, February 2001, pp. 104-111.
  4. Bernhard, A. B. F. and Chopra, I., “Hover Testing of a Mach-Scale Rotor with Active Blade Twists,” Smart Material and Structures Journal, Vol. 10, No. 1, February 2001, pp. 35-52.
  5. Lee, T. and Chopra, I., “Design of Piezostack-Driven Trailing-Edge Flaps for Helicopter Rotors,” Smart Material and Structures Journal, Vol. 10, No. 1, February 2001, pp. 15-24
  6. Koratkar, N. and Chopra, I., “Wind Tunnel Testing of a Mach-Scaled Rotor Model with Piezbender Actuated Trailing-Edge Flaps,” Smart Material and Structures Journal, Vol. 10, No. 1, February 2001, pp. 1-14.
  7. Yeo, H. and Chopra, I., “Coupled Rotor/Fuselage Vibration Analysis Using Detailed 3-D Airframe Model,” Mathematical and Computer Modeling, Vol. 33, 2001, pp. 1035-1054.
  8. Prahlad, H. and Chopra, I., “Comparative Evaluation of Shape Memory Alloy Constitutive Models with Experimental Data,” Journal of Intelligent Material Systems and Structures, Vol. 12, No. 6, June 2001, pp. 383-397.
  9. Sirohi, J. and Chopra, I., “Actuator Power Reduction Using Tuned L-C Oscillator Circuits,” Journal of Intelligent Material Systems and Structures, Vol. 12, No. 12, December 2001, pp. 867-878.

2000

  1. Koratkar, N. and Chopra, I., “Development of a Mach-Scaled Model with Piezoelectric Bender Actuated Trailing-Edge Flaps for Helicopter Individual Blade Control (IBC),” AIAA Journal, Vol. 38, No. 7, July 2000, pp. 1113-24.
  2. Chopra, I., “Status of Application of Smart Structures Technology to Rotorcraft Systems,” Journal of the American Helicopter Society, Vol. 45, No. 4, October 2000, pp. 228-252.
  3. Sirohi, J. and Chopra, I., “Fundamental Understanding of Piezoelectric Strain Sensors Journal of Intelligent Material Systems and Structures, Vol. 11, No. 4, April 2000, pp. 246-257.
  4. Sirohi, J. and Chopra, I., “Fundamental Behavior of Piezoceramic Sheet Actuators,” Journal of Intelligent Material Systems and Structures, Vol. 11, No. 1, January 2000, pp. 47-61.
  5. Prahlad, H. and Chopra, I., “Experimental Characterization of Ni-Ti Shape Memory Alloy Wires Under Uniaxial Loading Conditions,” Journal of Intelligent Material Systems and Structures, Vol. 11, No. 4, April 2000, pp. 263-271.
  6. Lee, T. and Chopra, I., “Design Issues of High-Stroke, On-Blade Piezostack Actuator for a Helicopter Rotor with Trailing-Edge Flaps,” Journal of Intelligent Material Systems and Structures, Vol. 11, No. 5, May 2000, pp. 328-343.