关键词: 动力学分析, 工作装置, 挖掘机, 应力试验

Abstract: By taking a 6-ton small excavator working device as the research object, working device’s transient dynamic analysis is studied with finite element method. When bucket hits ground in the driving of stick hydraulic cylinder, the actual working pressures and displacements process of each hydraulic cylinder are measured with pressure and displacement sensors. The forces of articulated points on working equipment can be obtained by means of excavator’s kinematics simulation in ADMAS, motions are obtained from hydraulic cylinder’s actual displacements and theoretical maximum digging force. In comparison with hydraulic cylinder’s actual working pressures, the results of simulation in ADMAS are verified. Under detrimental working conditions, the transient dynamic analysis is conducted for finite element analysis. In comparison with stress test results and simulation calculation results, it is shown that the stress variation trend of corresponding measuring point is basically consistent, and the error is within 10%. The results provide a basis for future structural optimization.

Key words: Excavator, Stress test, Transient dynamic analysis, Working device