基于Duhamel积分的横梁动载冲击分析

Dynamic Impact Analysis of Beam Based on Duhamel Integral

以多自由度体系的动力特性分析为基础,对瞬态冲击下的横梁进行多体动力学分析,在此基础上对旋转机械瞬态冲击的横梁进行了动力学响应测试。以Duhamel积分为基础研究了冲击载荷下旋转机械的扭转时间、扭转弧长轨迹和冲击力矩的大小,并将其与实测数据对比,理论分析数据与解体检测的数据基本吻合。以此为基础对横梁瞬态的扭转冲击能量进行了分解,对三种不同假设条件下的能量耗散进行了数值分析,结合横梁的具体结构进一步研究了碰撞过程横梁的水平和垂直振动变化情况。以减小垂直振动冲击为目标,提出了相应的解决措施和方案。

Based on the analysis of the dynamic characteristics of the multi-degree-of-freedom system,the multi-body dynamics analysis of the beam under transient impact was carried out,and the dynamic response of the beam under transient impact of the rotary machine was tested.In view of those failure modes of the rotary machine,those type of failure categories were studied in multi-degree-system theory.Those torsion times and torsion arc length and impact moment were studied by Duhamel integral.These theoretical analysis data and disassembly inspection data were basically consistent.These tensional impact energy of the rotary machine were decomposed,numerical analysis of energy dissipation under three different assumptions were completed,those horizontal vibrations and vertical vibrations of block beams during the collision process were further studied in combination with those beam structures.In order to reduce those vertical vibration impactions,corresponding solutions and plans were put forward.