刚柔混合法在双层隔振系统隔振效果预测中的应用

摘要

首先建立双层隔振多刚体动力学计算模型,研究系统参数对隔振效果的影响.然后以6L16/24柴油机为研究对象,在原有单层隔振系统的基础上进行双层隔振设计.最后针对所设计的双层隔振系统,在Ansys中建立曲轴、机体和中间质量块的有限元模型,进行子结构缩减;在AVL-Excite中建立柴油机柔性体虚拟样机模型,仿真计算各悬置点的加速度,基于此计算其1/3倍频程谱和振动量级,在设计阶段从振级落差的角度预测双层隔振柴油机的隔振效果.%The multi rigid-body dynamic model for a double layer vibration isolation system is established, and the influence of the system parameters on vibration isolation effect is studied. In virtue of the analysis of the original single-layer vibration isolation system, the double layer vibration isolation of 6L16/24 diesel engine is designed. Finally, the finite element models of the crankshaft, the engine block and the intermediate mass block are built by means of the Ansys and the substructure reduction is carried out. The virtual prototype model of the diesel engine flexible body is built in AVL-Excite. The acceleration of each suspension point is simulated. On this basis, the 1/3 octave spectrum and vibration level as well as the vibration level drop at each suspension point are computed. The vibration isolation effect of the double layer isolation of the diesel engine is predicted.