基于掘进机履带架焊接变形的履带动力学特性分析

Analysis of Dynamic Characteristics of Tracks Based on Welding Deformation of Roadheader Crawler Frames

针对履带架焊接变形对履带行走动力学的影响,应用Ansys有限元方法,模拟履带架的焊接过程,求得履带架的变形量。在此基础上,采用集中质量法建立履带的多自由度动力学模型,根据Bekker理论以履带与地面间的接触力为外部载荷,采用数值分析法求解履带架不同变形量对履带张紧力和振动的影响。仿真结果表明:焊接变形使履带板出现摆角变化,受此影响,履带架的焊接变形对履带行走动力学影响较大,变形越大张紧力越大,在履带板摆角为0.7°时,驱动处的履带张紧力在44 k N至45.6 k N之间变化,波动剧烈。

The influence of welding deformation of the roadheader crawler frame on the travel dynamics of tracks isstudied.The welding process of the crawler frame is simulated by means of the Ansys finite element software and thedeformation of crawler frame is obtained.On this basis,the multi-DOF dynamic model of the track is established by LumpedMass Method.According to Bekker theory,the contact force between the track and the ground is regarded as external load.Theinfluence of the different deformations of the crawler frame on the tensile force and vibration of the track is analyzednumerically.The simulation results show that the welding deformation of the track frame can make the track plate to have aswing angle change,which has a great influence on the travel dynamics of the track.Large deformation of the track frame canlead to a large tensile force.When the swing angle reaches0.7°,the drive-induced tensile force of the creepers of the track iswithin44kN-45.6kN,which induces violent vibration.