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A Generalized Madymo Modeling Approach With Both Frontal Occupants in a Range of Impact Situations

[+] Author Affiliations
Rex T. Shea

General Motors Corporation

Paper No. IMECE2004-61533, pp. 639-646; 8 pages
doi:10.1115/IMECE2004-61533
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Applied Mechanics
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-4702-0 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

A generalized MADYMO model that includes both the driver and passenger was developed to simulate the occupant responses under different restraint conditions in various impact situations. Traditionally in safety simulations the occupant was given the inverse of the vehicle acceleration and the vehicle compartment remains stationary. This approach works for frontal impacts where the longitudinal motion of the occupants dominates the kinematics. For an offset or angled impact, where the vehicle experiences a general three-dimensional motion, this approach loses its advantage. A prescribed motion approach is used instead, where the vehicle was given a prescribed three-dimensional motion, and the occupant’s responses are recorded similar to an actual crash. Driver and passenger models are generally being developed separately for each impact situation. This creates a maintenance and updating problem, because a single design change could require modifying a family of models. In this study a master model was developed using the prescribed motion approach, and both the driver and the passenger were incorporated into the model. This has the advantage of streamlining the restraint system development process, and avoiding tedious maintenance at the same time. A single model can be used for a range of impact situations, and all occupant responses can be generated. The model can be used to simulate frontal impacts at different speeds, angled impacts, and offset deformable barrier tests. A pair of angled impacts and an NCAP test were used as examples to demonstrate the versatility of the model and correlations to barrier tests were discussed.

Copyright © 2004 by ASME

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