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Rajendra Singh

Professor


BS (Honors) 1971, Birla Institute, Pilani, India
MS 1973, IIT Roorkee, India
Ph.D. 1975, Purdue University

Room E545
201 W. 19th Ave.
Columbus, OH 43210

614-292-9044

Email: singh.3

Web site: http://rclsgi.eng.ohio-state.edu/%7Esingh/ADL.html
Thrust Area(s): Dynamics and Controls

Research

Focus of Research and Graduate Education:

  • Machine dynamics, acoustics and vibrations
  • Non-linear dynamics and signal processing
Key Application Areas:
  • Automotive noise, vibration and harshness (NVH) control
  • Geared system dynamics and acoustics (automotive and rotorcraft systems)

The Acoustics and Dynamics Laboratory is concerned with the analysis, design and synthesis of automotive and mechanical transmission systems for reducing noise, shock and vibration; development of inter-relationships between dynamic forces and motions in rigid or elastic machine elements; study of complex acoustic sources and transmission paths; techniques for passive and active noise control; and digital signal processing for sound quality, system identification, and diagnostics. Since most mechanical systems exhibit significant nonlinearities associated with clearance nonlinearities (such as backlash and multi-staged springs), dry or sliding friction, finite amplitudes, etc., nonlinear dynamic studies are emphasized. Refer to the list of journal publications on http://www.autonvh.org/ where more than 145 articles have been posted; these provide specific information on the knowledge generated. Professor Singh has received several national awards for research and teaching, and 12 of his graduate advisees have won outstanding paper awards. Go to the following link for a listing: http://www.mecheng.ohio-state.edu/docs/FacultyAwardsList.pdf

Major facilities of the Acoustics and Dynamics Laboratory include several two, four and eight channel FFT analyzers, a laser scanning system, modal testing systems, acoustic intensity probes, hemi-anechoic and reverberation rooms, and an assortment of exciters and transducers. Computer-aided analysis, design and testing software, including finite element and boundary element programs are also available.

Selected Publications

Go to http://www.autonvh.org/ to view more than 165 articles. Some recent journal publications are listed below:

  1. S. Kim and R. Singh, Alternate Methods for Characterizing Spectral Energy Inputs based only on Driving Point Mobilities or Impedances, Journal of Sound and Vibration, 291, 604-626, 2006.
  2. C. Duan and R. Singh, Dynamics of a 3DOF Torsional System with a Dry Friction Controlled Path, Journal of Sound and Vibration, 289(4-5), 657-688, 2006. 
  3. S. He and R. Singh, Estimation of Amplitude and Frequency Dependent Parameters of Hydraulic Engine Mount Given Limited Dynamic Stiffness Measurements, Noise Control Engineering Journal, 53(6), 2005.
  4. V. Asnani, R. Singh and S. Yurkovich, Active Control of Amplitude or Frequency Modulated Sounds in a Duct, Noise Control Engineering Journal, 53(5), 211-221, 2005 
  5. P. Wickramarachi, R. Singh, and G. Bailey, Analysis of Friction-Induced Vibration Leading to "EEK" Noise in a Dry Friction Clutch, Noise Control Engineering Journal, 53(4), 122-128, 2005.
  6. C. Duan and R. Singh, Super-Harmonics in a Torsional System with Dry Friction Path Subject to Harmonic Excitation Under a Mean Torque, Journal of Sound and Vibration, 285(4-5), 803-834, 2005.
  7. H. Lee and R. Singh, Acoustic Radiation from Out-of-Plane Modes of an Annular Disk Based on Thick Plate Theory, Journal of Sound and Vibration, 282(1-2), 313-339, 2005.
  8. T.C. Kim, T.E. Rook and R. Singh, Effect of Nonlinear Impact Damping on the Frequency Response Characteristics of a Torsional System with Clearance, Journal of Sound and Vibration, 281(3-5), 995-1021, 2005.
  9. T.C. Kim, T.E. Rook and R. Singh, Super- and Sub-harmonic Response Calculations for a Torsional System with Clearance Non-linearity using Harmonic Balance Method, Journal of Sound and Vibration  281(3-5) , 965-993, 2005
  10. H. Lee and R. Singh, Determination of Sound Radiation from a Simplified Disk-Brake Rotor by a Semi-Analytical Method,  Noise Control Engineering Journal, 52(5), 225-239, 2004.