Automotive CAE Durability Analysis Using （汽车使用CAE耐久性分析）.pdfVIP

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2017-08-11 发布于浙江
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Automotive CAE Durability Analysis Using （汽车使用CAE耐久性分析）.pdf

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Automotive CAE Durability Analysis Using （汽车使用CAE耐久性分析）

Automotive CAE Durability Analysis Using Random Vibration Approach Hong Su, Ph.D. CAE Tools and Methods Group Advanced Technology Office, Visteon Corporation Abstract Dynamic road loads to automotive structures are random in nature and can be conveniently characterized as random processes in terms of the power spectral density (PSD) functions. Typical multiple dynamic loadings are modeled as a correlated PSD complex matrix. The random responses are simulated efficiently by employing MSC.Nastran frequency response module. The statistical characteristics of a random response are found through the moments of its PSD function. The total damage and durability life of a structure due to multiple road load events, corresponding to multiple road surfaces and events of a typical vehicle proving ground test, are then derived. A practical procedure for automotive CAE durability analysis using the random vibration approach is presented in this paper. Two example results of automotive structures, a rear axle assembly made of metals, and a headlamp assembly made of plastics, are given to demonstrate the approach and their applications. The results show that the random vibration approach costs less CPU time and memory. 1 Introduction Computer aided engineering (CAE) provides a means of verifying design for durability of automotive structures without making hardware prototypes. CAE durability can thus reduce time and cost for product development. There are, in general, two approaches for dynamic automotive CAE durability analysis, one is time domain approach and the other frequency domain approach. The time domain durability