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Song, Seung-Jae
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Low Risk Deployment Passenger Airbag System

CIS Tech-Seung-Jae Song, Jong S. Nam
S&T Daewoo-Young-Yeol Park, Soung-Jin Kim, Dong-Eun Kim
Published 2007-04-16 by SAE International in United States
A low risk deployment passenger airbag system has been developed to reduce the risk of injuries caused by airbag inflation to small size occupants and improve the restraint of adult occupants in high speed crashes as well. The new passenger airbag system has two airbags mounted on the instrument panel in such a way to reduce the inflator outputs and enhance deployment modes toward the occupant. A series of static and dynamic tests has been conducted to prove the concept using the FMVSS-208 test procedures and other due care conditions. The test results show that the new passenger airbag system can not only meet the injury criteria set by the government regulation but also enable deployment for all size occupants, belted or unbelted.
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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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Large Scale High Speed Dynamic Crush Tests Using Two Sleds

DaimlerChrysler Corporation-Seung-Jae Song, Homyoung Kim, Eugene Schoenherr
Published 2005-04-11 by SAE International in United States
It is often necessary to dynamically test a big vehicle part such as a rail tip at component level in high speed. Such a big part can be crush tested dynamically using two sled carriers. The methodology is shown and discussed here, and equations are developed to help determine required parameters such as sled velocity and weights. Test results using a truck rail tip are shown and compared to full vehicle test results for correlation.
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