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Squeak&Rattle - New Equivalent Static Load (ESL) based on Dynamic Distortion in all Body Openings from both Test and Simulation

AFRY-Viktor Jönsson
BETA CAE Nordic AB-Mohamed Zaben
  • Technical Paper
  • 2020-01-1556
To be published on 2020-06-03 by SAE International in United States
The body stiffness has a major impact on the Squeak&Rattle (S&R) performance of a car. Since the body structure of electrical/automated cars will differ clearly from traditional bodies, an enhanced requirement is needed to limit the distortion in the closure openings. The new requirement can be derived from a complete vehicle simulation using the deformation of the diagonals in the closure openings. This simulation includes different test tracks by using the dynamic road load data which can be obtained from a multi body simulation of a complete vehicle. Since the requirement needs to be applied early in the development only an untrimmed body model (BIG) is available, which can be used for a simplified static load. This paper shows a new approach of defining an equivalent static load (ESL), which considers both the reduction from a complete vehicle to a BIG and from a dynamic load to a static load. The approach is based on the comparison of the deformation in the diagonals of all closure openings between the dynamic simulation of a complete trimmed…
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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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Information Technology - A Challenge for Automotive Electronics

Robert Bosch GmbH-Karlheinz Topp, Jens Weber
Published 2001-03-05 by SAE International in United States
In the automotive industry, a steadily growing number of mono-functional electronic control units (ECUs) with increasing complexity on the one hand and restrictive requirements for power consumption and mounting space on the other hand are forcing changes in car electronics. This tendency is enforced by increasing requirements on security, comfort, fuel consumption and emission. In luxury cars, we are now at up to 80 more or less independent electronic units with low potential for synergies between functions (pan-functional services). The actual assembly of electronic units is certainly easily expandable, has very low error propagation but it also involves lots of logistic and bulky cabling with unwanted weight as well as extensive space and power consumption.If trends are properly interpreted, synergies between functions for more comfort, additional safety and security as well as minor air pollution are required in the future at least at unchanged costs in the vehicle's electronics. To be cost-effective this requires as far as possible software implementation. Therefore, the current multi-unit electronics solution might be replaced in a long-term range by a…
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The Significance of a Reference Architecture in the Automotive Industry

Robert Bosch GmbH-Jens Weber, Fabio Peruzzi
Published 2000-03-06 by SAE International in United States
In the automotive industry, a steadily growing number of mono-functional electronic control units (ECUs) with increasing complexity on the one hand and restrictive requirements for power consumption and mounting space on the other hand are forcing an architectural change in car electronics. Computer platforms with a client/server architecture could potentially reduce the number of ECUs in a car drastically, with a commensurate reduction of costs and space, better integration possibilities for enhanced functionality and additional services during the lifetime of a car.One of the problems which arises when those architectures come to the car is coping with the complexity of mainly software-based functionality and reliability issues under the aspect of rapidly evolving hardware infrastructure. The reorganization of car electronics also offers the possibility of a redistribution of functionality in the car which has been designed in the past for specific demands. In the case of the introduction of a client/server-architecture, it is proposed that a Reference Architecture based on a consistent top-down design process be specified where from further component specifications (e.g. interfaces) can be…
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Information Technology Restructures Car Electronics

Robert Bosch GmbH-Jens Weber, Torsten Bertram, Timo Kytölä, Fabio Peruzzi, Steffen Thiel
Published 1999-03-01 by SAE International in United States
In the automotive industry a growing number of mono-functional control units with increasing complexity on one hand and requirements for reduced power con-sumption and mounting space on the other hand are enforcing an architectural change of the car electronics. Computer platforms with a client/server architecture are candidates to reduce the number of control units drastically followed by a reduction of costs, space and better integration possibilities for enhanced func-tionalities as well as additional services. The problem which comes up now if those architectures are coming to the cars is to cope with software complexity and reliability issues under the aspect of continuously evolving hardware infrastructure.To understand the problems better, the Corporate Engineering within Robert Bosch GmbH has build a multifunctional look-and-feel demonstrator in a first step using a component-based software architecture on a standard PC-platform. Experiences are reported. Therefrom it also has been learned that for cost efficiency in the software development on any hardware architecture, a platform-like Software Process is necessary which allows highly reusability of non-product-related assets and comparably little additional product-specific engineering.…
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