【摘要】 本文采用统计能量分析法(Statistical Energy Analysis,简称 SEA)对汽车发动机振动能流进行分析和控制.首先建立汽车发动机的 SEA 模型,根据理论分析,确定汽车发动机油底壳阻尼结构参数,从而控制发动机油底壳辐射噪声,并通过对发动机油底壳进行正弦激振,阻尼损耗因子测定和全息测量等实验,SEA 理论分析结果得到很好的验证.更多还原

【Abstract】 Modal analysis has become a widely-used tool for verifying the dynamic behavi- our of systems,and for validating models designed using analytical methods such as finite element analysis.But modal analysis technology is of difficulty in solving a complex mechanical structure’s vibration which is in a band of high-frequency(high modal densities).Statistical Energy Analysis(SEA)is most useful and reliable in application to systems which have rather close natural frequencies,and is best suited to this problem in the case of high-frequency vibration.So we used SEA to research into the equations of the vibration energy of an engine.When an oil pan is dealt with damping method its loss factor is increased and the average radiation of the engine’s noise power is decreased.更多还原