Design and Optimization of Engine Mount
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Engine is consider as one of the main source in producing noise and vibration in vehicle. Engine mount is used between chasis and body to control engine vibration. The goal of the paper is introducing optimization method to find optimum value for engine mount specification based on random vibration method. Changing design parameters such as: location of engine mount, angle of instal, stiffness and damping coefficient of engine mount causes to change Natural frequency and vibration transmissibility ratio of system. For this purpose, full vehicle finite element model include chasis, body, suspension system, tires, seats, glosses and engine of typical van vehicle is provided and the effect of engine unbalances harmonic is applied on the model as a Power Spectral Density (PSD) form. Finally, driver seat PSD acceleration in three direction (longitudinal, lateral and vertical) is obtained. Design parameters (location, stiffness, damping coefficient of engine mount) change in specific range to find best system response. Final result shows that driver seat PSD acceleration can be considered as an optimum choice.
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