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Failure Mode Analysis of Automotive Exhaust System Hot End
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2011 by SAE International in United States
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In this paper, a technical approach is proposed to solve the hot end failure issue of an exhaust system, which can increase the reliability and efficiency of FE calculation in the trouble-shooting process. An exhaust system in which the downpipe broke during the high speed road load test is taken as an example. In order to keep the virtual FE model consistent with the real operational conditions, lots of modifications are made, including mass correction, damping and Young's modulus. Also modal sensitivity analysis is performed to accelerate this correlation process between FEA and test, where the effect of Young's modulus, pipe wall thickness and isolator stiffness on the modal frequency is investigated. Based on the correlated FE model, the revised design is checked through inputting the engine dyno vibration data and stress levels are evaluated near the critical locations. It is validated by test that the revised design proposed following the current approach meets the durability target.
CitationDai, Z., He, H., and Xu, D., "Failure Mode Analysis of Automotive Exhaust System Hot End," SAE Technical Paper 2011-01-0787, 2011, https://doi.org/10.4271/2011-01-0787.
- Friswell, MI Mottershead, JE Finite element model updating in structural dynamics Kluwer Academic Publishers Dordrecht/Boston/London 0-7923-3431-0 1995
- Jaishi, Bijaya Ren, Wei-Xin Structural Finite Element Model Updating Using Ambient Vibration Test Results J. Struct. Engrg. 131 4 617 628 2005
- Lammens, S. Brughmans, M. Leuridan, J. Sas, P. “Application of a FRF Based Model Updating Technique for the Validation of Finite Element Models of Components of the Automotive Industry,” SAE Technical Paper 951246 1995 10.4271/951246
- Zhou, S. “An Approach for Dynamic Response Correlation of Exhaust System between Measurements and FE-Simulations,” SAE Technical Paper 2010-01-1569 2010 10.4271/2010-01-1569