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Experimental Study and Modeling of Hydraulic Mount and Engine System
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English
Abstract
Hydraulic (fluid) mounts use the inertia of a fluid to provide high damping over a narrow range of frequencies. This high damping is useful for reducing vibrations, such as engine idle shake. The various configurations of hydraulic mounts can be divided into two categories: single and double-load-bearing fluid chambers. Mathematical models in the literature(1, 2, 3, 4, 5 and 6) for both categories are reviewed. A more comprehensive model for the single-load-bearing-chamber fluid mount has been developed and validated by comparison with experimental data. This model relates dynamic properties of hydraulic mounts to device parameters, such as chamber stiffness, channel length, channel cross-sectional area (orifice size), and fluid density. These device parameters can be internally manipulated to change mount performance. This comprehensive model was used for initial design of a fluid engine mount. The resonances for the engine/mount system were then determined using experimental modal analysis. The mount was tuned for one of the rigid body mode frequencies of this engine/mount system by varying device parameters as directed by the model. The tuned mount substantially reduced vibration at this frequency.
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Authors
Citation
Gau, S. and Cotton, J., "Experimental Study and Modeling of Hydraulic Mount and Engine System," SAE Technical Paper 951348, 1995, https://doi.org/10.4271/951348.Also In
References
- Flower W. C. “Understanding Hydraulic Mounts for Improved Vehicle Noise, Vibration and Ride Qualities,” SAE 850975 1985
- Clark M. “Hydraulic Engine Mount Isolation,” SAE 851650 1986
- Shoureshi R. Graf P. Houston T. “Adaptive Hydraulic Engine Mounts,” SAE 860549 1986
- Nakajima Z. “The Development of Hydraulic Strut Mount,” SAE 901729 1990
- Kim G. Singh R. “Proceedings of the 10th International Modal Analysis Conference,” San Diego, California 1992 320
- Ushijima T. Dan T. “Nonlinear B.B.A. for Predicting Vibration of Vehicle with Hydraulic Engine Mount,” SAE 860550 1986