- Development of model simplification algorithms for context dependent contact preserving off-line model simplification for interactive rigid body dynamics simulations.
- Development of model simplification algorithms for fluid - rigid body interaction problems such as for simulation of unmanned sea surface vehicles (USSV) at real time refresh rates.
- Development of model simplification algorithms for finite elemet analysis model preparation.

Model simplification algorithms for simulation of USSV-ocean interaction at real time refresh rate: We utilize potential flow theory based fluid flow model and assume the USSV as a rigid body, incorporating environmental effect such as wave-boat interaction force, damping and effects such as restoring forces and added mass effect to simulate the USSV. We developed a new simplification technique based on (1) clustering of boat geometry facets such that the surface integral difference over simplified and unsimplified boat surface is minimized, (2) caching the force values and exploiting temporal coherence based on difference in ocean waves around the boat, and (3) parallel computing to achieve significant speed up in the simulation without introducing significant errors.

CAD Model Simplification for FEA: This task involves suppressing the non-critical model features, such as holes and fasteners, based on the functional criteria. Suppression of these features reduces the computationally expensive simulation times, without affecting the accuracy of the results. We are developing an automated procedure for detecting the non-critical features and supressing them.

- A. Thakur, A.G. Banerjee, and S.K. Gupta. A survey of CAD model
simplification techniques for physics-based simulation applications. Computer Aided Design,
41(2):64-80, 2009.

- A. Thakur and S.K. Gupta. Context dependent contact preserving
off-line model simplification for interactive rigid body dynamics
simulations. ASME Computers and
Information in Engineering Conference, August 30-September 2,
2009, San Diego.

- A. Thakur and S.K. Gupta. Real-time dynamics simulation of unmanned sea surface vehicles for virtual environments.
*ASME Journal of Computing and Information Science in Engineering*,11(3):031005, September 2011. - B. Russ, M. Dabbeeru, A. Chorney, D. Skelley, and S.K. Gupta. Suppressing features to generate simplified models for finite element analysis.
*ASME Computers and Information in Engineering Conference*, Washington DC, August 2011.

Dr. Satyandra K. Gupta

Department of Mechanical Engineering and Institute for Systems Research

University of Maryland

College Park, MD-20742

Phone: 301-405-5306

FAX: 301-314-9477

WWW: http://www.glue.umd.edu/~skgupta/