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An Analysis and Application of a Decoupled Engine Mount System for Idle Isolation
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English
Abstract
This paper addresses the issue of front wheel drive engine idle isolation. It establishes criteria for design and presents an analysis of an application. The approach was to model the powertrain and engine mounts as a 6 D. O. F., lumped parameter system, and decouple the five highest frequency rigid body modes from the direction of the idle torque pulses (crankshaft rotation direction).
A packageable decoupled mounting system was obtained by using a Ford in-house program for simulating dynamic systems (MOTRAN) and a structural design optimization program (OPUS).
A baseline mount system and a decoupled mount system were installed and tested in a production vehicle. A three cylinder engine with similar inertia properties to the production four cylinder engine was used for the analysis and vehicle evaluation. A simulated idle test and an actual engine excited idle test were performed on the vehicle. A factor of two reduction in vehicle interior vibration levels was obtained with the decoupled mounting system at the frequency band of interest.
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Authors
Citation
Ford, D., "An Analysis and Application of a Decoupled Engine Mount System for Idle Isolation," SAE Technical Paper 850976, 1985, https://doi.org/10.4271/850976.Also In
References
- Roven W. G. and Petaja A. E., “Design Guide Engine Mounts”, Ford Motor Company internal document, May, 1967
- Geck P. E. and Patton R. D., “Front Wheel Drive Engine Mount Optimization” SAE Paper #840736, Fith International Conference on Vehicular Structural Mechanics Proceedings, Detroit, Michigan, April 2, 1984
- Adelberg M. L., “MOTRAN Users Guide” version three, Ford Motor Company internal document, January, 1981