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Benhayoun, Ismail
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Simulation and Optimization Driven Design Process for S&R Problematic - PSA Peugeot Citroën Application for Interior Assembly

Altair Engineering-Ismail Benhayoun, Julien Masson
PSA Groupe-Frédéric Bonin, Antoine Milliet de Faverges
Published 2017-06-05 by SAE International in United States
NVH (Noise Vibration & Harshness) is one of the main focus areas during the development of products such as passenger cars or trucks. Physical test methods have traditionally been used to assess NVH, but the necessity for reducing cost and creating a robust solution early in the design process has driven the increased usage of simulation tools. Development of well-defined methods and tools for NVH analysis allows today’s OEMs to have a virtual engineering based development cycle from concept to test. However, a subset of NVH problems including squeak and rattle (S&R) have not been generally focused upon. In a vehicle, S&R is a recurring problem for interior plastic parts such as an instrument panel or door trim. Since 2012, Altair has been developing S&R Director (SnRD), which is a solution that identifies and combats S&R issues by embedding the Evaluation-Line (E-Line) methodology [1] [2]. This methodology is based on industry best practices, as described in the paper SAE 2012-01-1553. This simulation based approach consist of predicting the risk of S&R for trim parts, identifying…
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Squeak & Rattle Correlation in Time Domain using the SAR-LINE™ Method

SAE International Journal of Passenger Cars - Mechanical Systems

SAAB Automobile AB-Jens Weber, Ismail Benhayoun
  • Journal Article
  • 2012-01-1553
Published 2012-06-13 by SAE International in United States
A new Squeak & Rattle simulation method was presented at the ISNVH conference 2010 (SAE 201-01-1423). This method, called the SAR-LINE™ method, is based on the evaluation of the relative displacement in time domain due to a random load. A specific challenge for a Squeak & Rattle simulation approach is to correlate the results to a real squeak or rattle phenomenon. This paper presents a new test procedure which enables the correlation between the results of the SAR-LINE™ simulation and the audible rattle occurrence. Three different configurations with increasing complexity were both tested and simulated. A pseudo random signal was used as load and the relative displacement was measured with the Laser Scanning Vibrometer in time domain. The movement in the gap and the rattle sound were recorded in a video sequence. The simulated results along the SAR line can directly be compared with the measured results along the gap. It is shown how the correlation between the rattle occurrence and the simulation results can be performed with the statistical evaluation approach of the SAR-LINE™…
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Squeak & Rattle Simulation - A Success Enabler in the Development of the New Saab 9-5 Cockpit without Prototype Hardware

SAE International Journal of Passenger Cars - Mechanical Systems

Saab Automobile AB-Jens Weber, Ismail Benhayoun
  • Journal Article
  • 2010-01-1423
Published 2010-06-09 by SAE International in United States
To achieve “right first time” design for SAAB projects, thus avoiding unnecessary development loops, a squeak & rattle simulation tool was required. This paper presents a new squeak & rattle simulation approach which covers the complete development process of interior parts. The process starts with a rough model, which is mainly based on styling data and ends with a model of a very high detail level close to serial tooling status. The detailed CAD model is then represented by a simulation model of similarly increasing quality. By using different types of analyses in the frequency and time domains (modal analysis, frequency response and transient analysis), the output of these simulations can be matched to the available FE model quality. During initial development the global behavior of the structure is of interest. Finally the relative displacement between two detailed trim parts is used to evaluate the risk for squeak & rattle. In order to identify the capability of the squeak & rattle simulation different correlation work between test and simulation has been performed. Examples of modal…
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