Table of Contents Author Guidelines Submit a Manuscript
Shock and Vibration
Volume 2, Issue 2, Pages 99-109

Air Bag Momentum Force Including Aspiration

Guy Nusholtz,1 Deguan Wang,2 and E. Benjamin Wylie3

1Chrysler Corp., USA
2Visiting Scholar, USA
3Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109-2125, USA

Received 8 August 1994; Accepted 18 October 1994

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A gas-jet momentum force drives the air bag into position during a crash. The magnitude of this force can change as a result of aspiration. To determine the potential magnitude of the effect on the momentum force and mass flow rate in an aspirated system, a series of experiments and simulations of those experiments was conducted. The simulation consists of a two-dimensional unsteady isentropic CFD model with special “infinite boundaries”. One of the difficulties in simulating the gas-jet behavior is determining the mass flow rate. To improve the reliability of the mass flow rate input to the simulation, a sampling procedure involving multiple tests was used, and an average of the tests was adopted.