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Dr. Inderjit Chopra
Alfred Gessow Professor
Director Alfred Gessow
Rotorcraft Center
Aerospace Engineering
University of Maryland
College Park, MD 20742
Ph:  301.405.1122
Fax: 301.314.9001
chopra@umd.edu


 


Publications : Recent Journals

2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | Archives

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. 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.

    Accepted For Publication
  • Brindejonc, A., Sirohi, J. and Chopra, I., “Design and Testing of an Autorotative Payload Delivery System,” Accepted for Publication in the Journal of the American Helicopter Society, 2007.
  • Parson, E., Sirohi, J. and Chopra, I., “Micro Air Vehicle: Cycloidal Rotor Concept,” Accepted for Publication in the Journal of the American Helicopter Society, 2007.
  • 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.
  • Hein, B. R. and Chopra, I., “Hover Performance of a Micro Air Vehicle: Rotor at Low Reynolds number,” Accepted for Publication in the Journal of the American Helicopter Society, 2006.
  • Datta, A., Nixon, M. and Chopra, I., “Prediction of Rotor Loads with the Emergence of Rotorcraft CFD,” Accepted for Publication in the Journal of the American Helicopter Society, 2006.
  • 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,” Accepted for Publication in the Journal of the American Helicopter Society, 2006.
  • Bao, J, Chopra, I. and Bernhard, A., “Wind Tunnel Testing of Low Vibration Mach Scale Rotor with Composite Tailored Blades,” Accepted for Publication in the Journal of the American Helicopter Society, 2006.

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, pp. 43-58.
  • 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.
  • 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.
  • 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.
  • 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.

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2005

  • 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.

2004

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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

  • Chopra, I., “Review of State-of-Art of Smart Structures and Integrated Systems,” AIAA Journal, Vol. 40. No. 11, November 2002, pp. 2145-2187.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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2002

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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

  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

For years prior to 2000, see Journal Archives

For Conference Procedings, see Recent Conferences

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