This paper describes a durability analysis method that was developed to define the enforced motion, stress responses and fatigue life of a mounted component subsystem, in this example a rear battery support and its attachments. The method combines the large mass method with the modal transient formulation (NASTRAN SOL 112) to analyze dynamic structural responses. The large mass method proved effective when working with the modal formulation and cases with known accelerations at a single point. For the rear battery support subsystem, these input accelerations were obtained from drive files of a 4-DOF shake table that was used for corresponding lab tests. The strain-life approach accounting for plastic deformation was used and is recommended for predicting fatigue life in such applications. With current desktop capability and parallel processing (dividing long time-histories into assumed independent segments), this process requires just a few hours for production applications. The potential for utilizing high performance machine for these types of simulations is also recognized.
A dynamic durability analysis method and application to a battery support subsystem
Methode und Anwendung einer dynamischen Haltbarkeitsanalyse auf ein Batterieauflager-Teilsystem
2004
7 Seiten, 6 Bilder, 4 Tabellen, 9 Quellen
Conference paper
English
A dynamic Durability Analysis Method and Application to a Battery Support Subsystem
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