Excavator Cab Rollover Protection Mechanical Property Analysis And Structure Optimization

This thesis introduces the study status on the engineering vehicle ROPS and the main research methods、research directions and points out the problems that existed in this area. And it also elaborates on the current international standards on the performance requirements and laboratory test methods of engineering vehicle ROPS. This thesis also discusses the basic theory and the numerical algorithm of computer simulation. With the help of the finite element analysis software, it does non-linear quasi-static simulations and mode analysis of the safety excavator cab. Through comparing the test data with the simulation results of ROPS. It is found that the model and the results of computer simulation are basically correct. On the basis of the results, it optimizes the current structure and provides the enterprise with theoretical support for designing and manufacturing.The roll-over process of the excavator cab is a geometric nonlinear and material nonlinear process, it refers to elasticity、elastic-plastic and plastic phrases, and it belongs to non-linear large plastic deformation problems.According to the current international standard requirements, quasi-load will be used mostly often in the laboratory experiments. The shell-solid finite element model is used in order to describe the plastic-deformation area accurately. The load velocity will take longer time and require higher computer performance. There are two ways to solve this problem efficiently according to the dynamic equations which is the foundation of the quasi-static simulation. One method is implicit analysis while the other is explicit analysis. Due to the limitation of the hardware,explicit analysis method has been chosen in this paper. The load-displacement curves can be got easily after taking a non-linear quasi-static simulation on the excavator cab by using finite element software HyperWorks. In order to avoid the Co-vibration between the cab and extrinsic motivations,mode analysis is also essential,this thesis supplies the first twelve vibration mode.This paper also got the load-displacement curves,the load-energy absorption curve and the failure mode of the cab by using laboratory test methods on the Roll-over protective structure.By comparing the simulation results and the laboratory test results, this article analyzes the reasonable of the simulation and optimizes the original structure.