Experimental Modal Analysis on Crankcase Cover of Magnesium Alloy

To understand the dynamic behavior of crankcase cover made of magnesium alloy in comparison to aluminum alloy crankcase cover,experimental modality analysis of the crankcase covers made of magnesium alloy and aluminum alloy was condmcted by means of the hammering method.Research result shows that similarity on modal parameters of the crankcase covers with different materials is depended on inherent relationship between the attribute parameters of these two kind materials.However,compared with the aluminum alloy crankcase cover,the magnesium alloy crankcase cover has a lower stiffness,and has a higher curve of the frequency response function.Therefore,it is necessary for the magnesium alloy crankcase cover to optimize its structure and exert its good performance in shock absorption.In general,in the case of the same structure,these two kind material have the similar modal parameters,so it is favorable for replacement between these two kind materials in practical engineering application.