Dynamics Simulation Research And Development Of Software Of Hydraulic Excavator Working Device

Mining hydraulic excavator has very bad working conditions, it works under the load of digging resistance、severe impact and vibration, which can lead to fatigue failure of working device. Therefore, the dynamics and fatigue analysis of mining excavator working device has a very essential significance.In this paper, the working device of a mining excavator is researched. Firstly, kinematic theoretical analysis of working device is researched according to testing length of the hydraulic cylinder change over time, the angular velocity and angular acceleration calculation result of each component in working device and hydraulic cylinder is applied on the finite element model as inertial load. Secondly, the three-dimensional model of excavator working device is imported from Pro/E to ADAMS, simulation of dynamic model in ADAMS is conducted by taking the length of the hydraulic cylinder change over time as input data, the angular velocity and angular acceleration theoretical result are verified by comparing them with simulation result of dynamic model in ADAMS. Next, parametric finite element model of working device is established by ANSYS APDL language, angular velocity and angular acceleration are applied on finite element model as inertial load to solve, then the data of hydraulic cylinder axial force change over time in ANSYS finite element model is compared with the data in ADAMS dynamic model. The dynamic stress of working device is tested and compared with the ANSYS simulation result of corresponding point in model. Equivalent stress changing over time of each node in the finite element model is used as stress history in fatigue analysis, combined with rain-flow counting method and Miner damage theory, fatigue life of each part in working device is calculated. Finally, based on Visual Basic 6.0 and ANSYS software APDL language, software for structual analysis of excavator working device is developed.In this paper, the dynamic-static method applying inertial load on static model is used to simulate the dynamic stress of working device, areas of lower fatigue life calculated according to the data of simulated dynamic stress history dovetail actual cracking areas of excavator, the feasibility of the method is proved.The developed structural analysis software realizes interface operation for the fatigue analysis of the excavator working device, it is convenient for the engineering technical personnel to use finite element analysis technique to guide the excavator design.