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Front Impact Pulse Severity Assessment Methodology

CIS Tech, LLC-Seung-Jae Song
DaimlerChrysler Corporation-Sikyeon Kim, Sukhbir Bilkhu
Published 2005-04-11 by SAE International in United States
The pulse severities from various vehicle impact tests need to be assessed during the impact structure development and targeting stage to assure that the occupants can meet the injury criteria as required. The conventional method using TTZV (time to zero velocity), TDC (total dynamic crush), and G1/G2 (two stage averaged pulse) is often unable to give a quick and clear answer to the question being raised. A simple numerical tool is developed here to assess the pulse severity with a single parameter in which the severity is expressed as the amount of chest travel under a certain target restraint curve or chest A-D curve. The tool is applied to several front impact vehicle pulses to show the effectiveness. The new method developed here can be used to assess the pulse severity in an easy and objective way along with conventional parameters.
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Three Dimensional Position Measurement using String-pots

CIS Tech, LLC-Seung-Jae Song
DaimlerChrysler Corporation-Jeffrey Robbins
Published 2005-04-11 by SAE International in United States
It is often necessary to measure three-axis displacement of a deforming or moving part in static or dynamic impact tests. A point moving in the three-dimensional space can be monitored and measured using three string-pots or other distance measuring devices with a methodology developed here. A numerical algorithm along with required equations are shown and discussed. The algorithm was applied as an example to static seat pull test and compared to results from film analysis. The application with string pots is useful especially when the point of concern gets hidden or blocked by other parts disabling the photogrammetry technology.
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