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Powertrain Mounting Design Principles to Achieve Optimum Vibration Isolation with Demonstration Tools
Technical Paper
2003-01-1476
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The way a powertrain is mounted plays an important role in improving vehicle noise and vibration caused by the engine firing forces and can be an effective role in improving vehicle ride comfort. This paper describes the basic concepts in powertrain mounting and derives a new concept of evaluating powertrain mounting. It is well known in publications that a decoupled powertrain mounting system has better NVH characteristics[3][4][6]. But how to relate percentage of decouple to powertrain mounts transmitted forces, what “decoupled” really means, and how to evaluate how much it is decoupled are still ambiguous to many engineers. The traditional “one coordinate system” kinetic energy fraction (KEF) index can't give a clear picture of how much the engine mounting is decoupled and is often misleading. The new concept focuses on the excitations acting on the powertrain system. The KEF index is simulated in global, engine and torque roll axis (TRA) coordinate systems, and the evaluation of decoupling is directed to a specific excitation. The global coordinate KEF index focuses on road and wheel excitation; the engine coordinate KEF index focuses on engine cylinder direction forces and corresponding torques excitation; and the TRA coordinate KEF index focuses on the crankshaft torque variation excitation which is critical for idle isolation.
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Authors
Citation
Sui, J., Hoppe, C., and Hirshey, J., "Powertrain Mounting Design Principles to Achieve Optimum Vibration Isolation with Demonstration Tools," SAE Technical Paper 2003-01-1476, 2003, https://doi.org/10.4271/2003-01-1476.Also In
References
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- Joeng, Taeseok “Analysis of Powertrain Mounts with Focus on Torque Roll Axis Decoupling and Frequency-Dependent Properties” Ohio State University 2000
- Bretl, John “Optimization of Engine Mounting Systems to Minimize Vehicle Vibration” SAE Technical Paper No. 931322
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