基于电测法铲运机后车体结构强度分析

Structural Strength Analysis on Rear Frame of LHD on Electrical Measuring Method

车体是铲运机的承载基体,既承担各部分总成的质量,又承受各种力和力矩,对整车性能的好坏其重要作用。14吨混合动力铲运机由同等承载的柴油铲运机改造而成,主要对后车体内传动系统和承载系统进行改造,对新结构形式下车架强度进行分析。在对铲运机典型工作循环分析的基础上,结合铲运机中央铰接处的结构特点,对混合动力铲运机整车进行受力分析,建立铲运机后车体有限元分析分析模型,对其结构强度进行分析。采用电测法对车体结构的插入、联合铲装过程进行应变测试,获得此过程应力变化情况,选取关键位置与有限元分析结果进行对比分析。结果表明:改造后车架强度满足要求;铲运机在后轮离开地面时,后车体出现应力最大值点,设计中需加以重点分析;有限元分析与试验测试结果的一致性,证明分析结果的可靠性,可以作为实际设计的参考依据。

Frame is scraper bearing matrix, which is in charge of the each part of the assembly quality, and subjected to various forces and moments, and plays an important role of vehicle pet.formance. 14 tons hybrid power LHD/s transformed by the same carrying diesel LHD, which are mainly on the rear vehicle transmission system and carrying system in transformation. The frame strength of the new structure is analyzed. Based on the analysis of typical work cycle on the scraper, according to the structural characteristics of the central articulation, and analyzes the stress of the vehicle, then the finite element analysis model of the rear frome is built and analyzed the structure strength. Under insertion and combined loading process, the strain of the frame is test. Comparative analysis is made on the stress value and the finite element analysis results of the key position. The results show that the frame strength meet the requirements after the transformation; the maximum stress point is in the rear frame, which need to be analyzed in the design; the results of finite element analysis and test results are consistent, which proves the reliability of the analysis results , and which can be used as refereuce for practical design.