Abstract
The need to reduce the fuel consumption of vehicles leads to having lighter chassis’ with lighter engines yet maintaining engine power. These new design requirements are in contrast with the vibration isolation requirements. To keep the vehicles light yet provide good cabin noise and vibration isolation, requires a new vibration isolation technology. Fluid mounts have been used in the aerospace and the automotive industry to provide cabin noise and vibration reduction for years. With the use of passive fluid mounts, the highest cabin noise and vibration reduction is achieved at a frequency called “Notch Frequency”. But typical passive fluid mounts have only one notch frequency. So the best cabin noise and vibration reduction is only achievable at one frequency. In this paper, a new fluid mount design in combination with a tuned vibration absorber is proposed. Bond graph modelling technique is used to model the new fluid mount design. The physical model and simulation results are presented. The effect of the natural frequency of the TVA on the dynamic stiffness of the fluid mount is studied.
Highlights
Vibration isolation is an important issue in the automotive and the aerospace industry
Physical and bond graph model of the fluid mount with the tuned vibration absorber (TVA) In order to represent the physical model of the new fluid mount design, it is needed to deal with two different energy domains: namely mechanical and hydraulic energy domains
Before analyzing the effect of TVA parameters on the dynamic stiffness of the new fluid mount design, it is necessary to make sure that the vibration amplitudes of the bottom chamber piston and TVA mass are reasonable and practical
Summary
Vibration isolation is an important issue in the automotive and the aerospace industry. Automotive companies compete to design more comfortable vehicles with lower cabin noise and vibration. Fuel consumption reduction is another important criterion in designing the new vehicles. There are many different types of engine mounts on the market that have been used in the past to isolate the cabin from the engine noise and vibrations and they are hard mounts, elastomeric mounts, wire mesh mounts, and passive fluid mounts. Passive fluid mounts have been used in the automotive and the aerospace industry to provide cabin noise and vibration isolation since 1940’s. There are two types of fluid mount designs that are often used in the industry: the single pumper [3] and the double pumper [4].
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