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This paper presents an analytical modeling and performance analysis of the hydraulic engine mount by using bond graph method, which is becoming more common in the industry for engine vibration and noise control. It is well known that the hydraulic engine mount can provide excellent frequency and amplitude response characteristics compared to the conventional elastic rubber type one. Numerous study has been attempted up to now to explain the complex dynamic performance characteristics of this mount through a variety of analytical methods but it is not yet fully understood.

The use of the hydro-elastic mount for passenger car engine as well as for heavy vehicle diesel engine is increasingly becoming common in the industry because they can provide excellent frequency and amplitude response characteristics compared to the conventional elasto-rubber type engine mount. Numerous articles have been attempted up to now to explain the complex performance charateristics of those mount but is not fully understood yet. In the present study a hydro engine mount with a circular inertia track and a free decoupler is designed for a 110 PS class In-line diesel engine in order to control and reduce the high amplitude low frequency vibration and noise in frequency range of 1 - 50 Hz in particular. A linear lumped model is developed in the study to analyse the dynamic response characteristics and the dynamic spectra results from the model are validated with experimental data over 1 - 50 Hz.

The Montreal Protocol, an international agreement to stop further depletion of the ozone in the stratosphere, was concluded in 1987 in Montreal, Canada as an effort of the global environmental protection through worldwide control of the production and the use of specific ozone-destroying substrances. More than 80 countries responded to the intent of the Protocol by placing special controls as well as the teminationg programs on the production and use of chlorofluor-ocarbons (CFC), beginning of July 1, 1989. Since the automobile and related industries are major consumer of CFC-12 for automotive air conditioner and in servicing shops handling the air conditioners, the role of the industry for environmental protection is very important.