Dynamic Analysis of Systems With Varying Constraints

[+] Author and Article Information
S. Djerassi

P.O. Box 2250 Haifa 32101, Israel

J. Appl. Mech 66(3), 786-793 (Sep 01, 1999) (8 pages) doi:10.1115/1.2791756 History: Received September 15, 1998; Revised December 03, 1998; Online October 25, 2007


This paper deals with constrained dynamical systems which are subject, during motion, to the replacement of one set of constraints with another. The theory of imposition and removal of constraints is used to formulate equations governing motions of such systems. To this end, the terms minimally constrained state (MCS), phase of motion, transition, and transition conditions are introduced. These terms are used to denote, respectively, state of a system subject only to constraints which are not removed throughout the motion, period of time during which an MCS system is subject to one set of constraints, event characterized by the instantaneous removal of one set of constraints and the imposition of another, and conditions, satisfaction of which initiate a transition. The indicated formulation enables the simulation of motions of the systems in question, including the evaluation of changes in the motion variables associated with the transitions. The formulation is particularly efficient in that the impulses arising during the transitions are automatically eliminated. The formulation is used to simulate motions of a number of systems, including a legged machine.

Copyright © 1999 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In