一、前言建筑机械的工作条件较恶劣,作业过程中免不了各种各样的撞击现象。对于工作装置这样的主要结构件,必须保证在撞击时不引起塑性变形。随着负荷频度的提高,更需精确分析撞击时构件的最大应力、应力分布和波形,这是进行工作装置的强度及重量优化设计必不可少的环节。以前,工作装置撞击强度计算,是由静态分析结果乘以动态增量(动载系数),或按类似机种的撞击加速度,进行空间杆系结构的静态分析。上述的撞击强度计算,由于 I. INTRODUCTION The working conditions of construction machinery are rather poor and various impact phenomena are inevitable during the operation. For a major structural component such as a work device, it must be ensured that no plastic deformation occurs on impact. With the increase of load frequency, it is more necessary to accurately analyze the maximum stress, stress distribution and waveform of the components during the impact. This is an indispensable link for optimizing the strength and weight of the working device. Previously, the working device impact strength calculation was carried out by static analysis results multiplied by a dynamic increment (dynamic load factor), or by a similar model’s impact acceleration for static analysis of space bar structure. The above impact strength calculation is due to