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CAE Virtual Design Validation Tests of Automotive Engine Mount Systems
Technical Paper
2009-01-0404
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a CAE virtual test procedure for automotive engine mount systems, which evaluates NVH and durability performance of an engine suspension design. Engine mount systems are virtually tested in terms of noise and vibration response characteristics, mount structural strength and fatigue durability, under the defined engine load conditions. The proposed procedure incorporates several CAE modeling and simulation technologies, including the definition of engine test loading environment, the modeling of nonlinear rubber bushings for their stiffness and damping properties, the frequency domain dynamic simulation, and fatigue damage prediction technologies. First, the test engine load specifications are defined from the measured engine vibration raw data with respect to engine speeds, and the engine speed duty cycle statistics. Secondly, the nonlinear rubber bushing properties are modeled as equivalent stiffness and damping elements in each of the mount directions, based on the measured dynamic bushing parameters, in the frequency domain. The dynamic simulations are then realized by using the frequency response analysis technique, for both NVH and durability performance tasks. The engine NVH performance is evaluated in terms of engine vibration isolation and noise transmission characteristics. For the mount bracket strength and durability, a method of fatigue damage prediction in frequency domain is introduced. The dynamic stresses of brackets are first simulated and sorted for potential high stress spots. The durability of each bracket structure then is evaluated based on the simulated stress and the corresponding material damage model. Automotive engine mount examples are provided to illustrate applications of the proposed virtual test procedure and associated techniques.
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Citation
Su, H. and Hua, Y., "CAE Virtual Design Validation Tests of Automotive Engine Mount Systems," SAE Technical Paper 2009-01-0404, 2009, https://doi.org/10.4271/2009-01-0404.Also In
References
- Thompson M. Igami H. Osodo K. “Automotive Powertrain Mounting System Design Optimization,” SAE paper 2008-01-0879 April 2008
- Moon H. Jeong G. Sung D. “The Development of Lab-Simulation Test to Accelerate the Durability Validation of Engine Mounting and Wiring Harness,” SAE paper 2003-01-0949 March 2003
- Yoon H. W. “Development of Engine Mount System for Low Frequency Vibration Improvement,” SAE paper 2008-01-0885 April 2008
- Hoppe C. Hirshey J. Sui J. “Powertrain Mounting Design Principles to Achieve Optimum Vibration Isolation with Demonstration Tools,” SAE paper 2003-01-1476 March 2003
- Ramorino G. Vetturi D. Cambiaghi D. Pegoretti A. Ricco T. “Developments in Dynamic Testing of Rubber Compounds: Assessment of Non-Linear Effects,” Journal of Polymer Testing 22 681 687 2003
- Rao M. Gruenberg S. Griffiths D. “Measurement of Dynamic Parameters of Automotive Exhaust Hangers,” SAE paper 2001-01-1446 March 2001
- Meirovitch L. “Analytical Methods in Vibrations,” The Macmillan Co. NY, New York 1967
- Thomson W.T. “Theory of Vibration with Applications,” 3rd Prentice Hall Englewood Cliffs, New Jersey 1988
- SAE J1099 Committee “Technical Report on Low Cycle Fatigue Properties,” SAE J1099 Society of Automotive Engineers Warrendale, PA August 2002
- SAE J1211 Committee “Recommended Environmental Practices for Electronic Equipment Design,” SAE J1211 Society of Automotive Engineers Warrendale, PA November 1978
- Su H. “Vibration Test Specification for Automotive Products Based on Measured Vehicle Load Data,” SAE 2006-01-0729 , SAE Transactions 115 Journal of Materials & Manufacturing 571 581 2006
- Su H. Rakheja, S. Sankar, T.S. “Stochastic Analysis of Nonlinear Vehicle Systems Using a Generalized Discrete Harmonic Linearization Technique,” Journal of Probabilistic Engineering Mechanics 6 4 1991 175 183
- Su H. Steinert D. Egle K. Weipert B. “Localized Non-linear Model of Plastic Air Induction Systems for Virtual Design Validation Tests,” SAE paper 2005-01-1516 15 24 April 11 2005
- Su H. Kempf J. Montgomery B. Grimes R. “CAE Virtual Tests of Air Intake Manifolds Using Coupled Vibration and Pressure Pulsation Loads,” SAE paper 2005-01-1071 , SAE Transactions 114 Journal of Engines 935 961 2005
- Su H. “Radiated Noise Prediction of Air Induction Systems Using Filter Seal Modelling and Coupled Acoustic-Structural Simulation Techniques,” SAE 2007-01-0253 New Engines and Design Technologies, World Congress Detroit, MI April 16 2007
- Su H. “Virtual Automotive Product Development Using Frequency Domain Simulation Techniques,” Proceedings of MSC Software 2007 Virtual Product Development Conference Detroit, MI, USA Oct. 11-12 2007
- Su H. “CAE Virtual Durability Tests of Automotive Products in the Frequency Domain,” SAE paper 2008-01-0240 April 2008
- “MSC.Nastran Reference Manual, Sections for Coupled Acoustic Analysis,” MSC Software publication 2002