Analysis of switched-rigid floating oscillator

Article type: Research Article

Authors: Marur, Prabhakar R.

Affiliations: India Science Lab, General Motors R&D, Creator Building, ITP, Bangalore – 560 066, India

Note: [] Corresponding author. Tel.: +91 80 4118 4043; Fax: +1 509 275 8715; E-mail: [email protected]

Abstract: In explicit finite element simulations, a technique called deformable-to-rigid (D2R) switching is used routinely to reduce the computation time. Using the D2R option, the deformable parts in the model can be switched to rigid and reverted back to deformable when needed during the analysis. The time of activation of D2R however influences the overall dynamics of the system being analyzed. In this paper, a theoretical basis for the selection of time of rigid switching based on system energy is established. A floating oscillator problem is investigated for this purpose and closed-form analytical expressions are derived for different phases in rigid switching. The analytical expressions are validated by comparing the theoretical results with numerical computations.

Keywords: Deformable-rigid switching, rigid-body modes, impulse response, mechanical vibration

DOI: 10.3233/SAV-2009-0474

Journal: Shock and Vibration, vol. 16, no. 4, pp. 355-364, 2009