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3-8 - Design Optimization and Development of Vibration...

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Design Optimization and Development of Vibration Analysis Program for Engine Mount System Chang Yong Song Technical Division, AhTTi Co., Ltd., Suite 904~5 of Sicox Tower 513-14 Sangdaewon1-dong Jungwon-gu Seongnam-si Gyeonggi-do 462-806 Korea [email protected] TEL) 82-31-777-9131 FAX) 82-31-777-9135 1
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Abstract Engine mount is purposed to control an excessive motion generated from powertrain system and to isolate vibration and noise to be transmitted to main system. As vibration design of engine mount is one of the main items on the phase of vehicle development, the design should be optimized considering various design variables and uncertainties. In the study, design optimization of engine mount for passenger vehicle is proposed using MSC.ADAMS based engine mount system analysis program – EMTOOLS. EMTOOLS is capable of carrying out vibration and static analysis, hydro mount & frequency dependent modeling (FDM), idle and engine shake analysis for 6-DOF and 16-DOF models. In addition, vibration design optimization is able to be facilitated by design of experiment (DOE) based sensitivity analysis and optimization algorithm. Keywords: Engine mount; Vibration design; EMTOOLS; DOE; Design optimization Introduction The vehicle engine mounting system generally consists of engine, transmission supplementary systems and several mount rubbers connected to the vehicle structure. The modern engine mounting systems have been successfully applied to isolate the driver and passenger from noise, vibration and harshness (NVH) generated from powertrain system. However, there is still a need to improve the performance of engine mounting systems for the following two reasons: One reason is that the requirements of vibration and noise isolation for passenger cars are increased. The second reason is that the modern car designs have a trend for lighter car bodies and more power-intensive engines. The comfort requirements, the weight reduction and the increased engine power sometimes have adverse effects on vibratory behavior. These aspects are often conflicting. Substantial improvement in the performance of engine mounting systems definitely plays an important role in resolving such conflicting requirements. There are substantial researches on the dynamic performances of engine mounting system. The current industrial strategies use a model approach to analyze the harmonic response of the powerplant on resilient supports attached to ground, and the 6-DOF model used in the modal analysis is interesting insofar as the 2
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response to an excitation is calculated and interpreted according to the position in frequency and to the form of the modes (Brach, 1997). To decouple the engine torque roll axis, dynamic decoupling axioms are presented and compared with the conventional elastic axis mounting and focalization methods (Jeong and Singh, 2000). The significance of the rigid body modes alignment for grounded powerplant to its vehicle behavior is handled with the accuracy of NVH vehicle models (Hadi and Sachdeva, 2003). Experimental
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