Design of Engine Mounting System Using A Two-level Optimization Method

• Main Authors: Huang, Yi-Jia, 黃奕嘉
• Other Authors: Kam, Tai-Yan
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/20147588773928615660

碩士 === 國立交通大學 === 機械工程學系 === 101 === The purpose of this thesis is to establish a two-level optimization method that can be used for the design of an engine mounting system. In the proposed method, we build a vibration model of the engine mounting system using the basic vibration principles to study the vibration behavior of the system. The modal energies together with the coupling coefficients of the six degrees of freedom of the system are identified. A two-level optimization technique is then established to solve two types of optimal design problems for the engine mount system. The first type is about the design of the locations and spring constants of the mounts to make the TRA (torque roll axis) and EA (elastic axis) of the engine mounting system coincide. The effects of the coincidence of the TRA and EA on the force transmissibility and decoupling of the modal energies of the optimally designed system are studied. The other type is about the design of the locations and spring constants of the mounts to minimize the reaction force at the rear mount which is closer to the steering wheel. It has been shown that the second type of optimization problem can produce more useful results for reducing the transmissibility of vibration from engine to steering wheel.