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Bilkhu, Sukhbir
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CAE Based Development of an Ejection Mitigation (FMVSS 226) SABIC using Design for Six Sigma (DFSS) Approach

Chrysler India Automotive Pvt, Ltd.-Dipu Purushothaman, Darshan Subhash Pawargi
FCA US LLC-Kalu Uduma, Brian Beaudet
Published 2015-04-14 by SAE International in United States
NHTSA issued the FMVSS 226 ruling in 2011. It established test procedures to evaluate countermeasures that can minimize the likelihood of a complete or partial ejection of vehicle occupants through the side windows during rollover or side impact events. One of the countermeasures that may be used for compliance of this safety ruling is the Side Airbag Inflatable Curtain (SABIC). This paper discusses how three key phases of the optimization strategy in the Design for Six Sigma (DFSS), namely, Identify; Optimize and Verify (I_OV), were implemented in CAE to develop an optimized concept SABIC with respect to the FMVSS 226 test requirements. The simulated SABIC is intended for a generic SUV and potentially also for a generic Truck type vehicle. The improved performance included: minimization of the test results variability and the optimization of the ejection mitigation performance of the SABIC.Results from this study show that for generic SUV and Truck type vehicles with hardware similar to that tested in this study; Beltline overlap, loft size and pressure account for 75% of the variability in…
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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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An Impact Pulse-Restraint Energy Relationship and Its Applications

DaimlerChrysler-Jianping Wu, Sukhbir Bilkhu, Guy S. Nusholtz
Published 2003-03-03 by SAE International in United States
This paper presents an energy relationship between vehicle impact pulses and restraint systems and applies the relationship to formulations of response factors for linear and nonlinear restraints. It also applies the relationship to derive optimal impact pulses that minimize occupant response for linear and nonlinear restraints. The relationship offers a new viewpoint to impact pulse optimization and simplifies the process mathematically. In addition, the effects of different vehicle impact pulses on the occupant responses with nonlinear restraints are studied. Finally, concepts of equivalent pulses and equal intensity pulses are presented for nonlinear restraints.
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