针对某发动机开发过程中出现的薄壁件结构振动及噪声较大的问题,应用有限元、多体动力学相关软件,对发动机表面振动水平进行评估。通过发动机弱点分析,确定优化方向,进行缸盖罩、正时罩和机油盘三大薄壁件结构优化,最终得到合格的优化样机。台架试验验证结果证明了仿真优化方案的合理性,同时,优化后的发动机达到了开发目标。 Aiming at the problem of vibration and noise of thin-walled structure appearing during the engine development process, the finite element and multi-body dynamics related software is used to evaluate the vibration level of engine surface. Through the analysis of engine weakness, to determine the direction of optimization, the cylinder head cover, the timing cover and the oil pan three thin-walled structure optimization, the final qualified qualified prototype. The test results of the bench proved the rationality of the simulation optimization scheme, meanwhile, the optimized engine achieved the development goal.