Mechanical-hydraulic Co-simulation On Working Divece Of Large-size Face-shovel Hydraulic Excavator And Optimization

Working device of shovel hydraulic excavator belongs to manipulator of construction machinery,widely used in construction,transportation,energy engineering,water conservancy and hydropower,military engineering and industries,not only increase efficiency,improve economic efficiency,but also reduce danger.Although large domestic demand,but homemade can't satisfy the current requirements,and abroad has a monopoly position in the market,inhibiting the development of excavator industry in China.For foreign restrictions on the patents in the industry,the domestic development of large hydraulic excavator shovel is constrained,so research on independent configuration brand-shovel hydraulic excavators is of a major and far-reaching significance.Working device is the core component of excavator,its performance directly affects the efficiency,reliability of the whole machine.This paper established multi-body dynamic model of working device and analyzed the dynamic characteristics of the working device and established a co-simulation of hydraulic and dynamic system to analyze the dynamic characteristics of the working device,finally did dynamic topology optimization of working device.Firstly,the paper used the experimental formula to calculate the excavating resistance,the resistance was as the working external load.And established rigid dynamics model by ADAMS,and analyzed and contrasted the rigid dynamical characteristics under different state of speed velocity and typical operating condition;and established rigid-flexible coupling model by ADAMS and Hypermesh,studied dynamic structure strength of working device under typical operating conditions;and did comparative analysis on the force of working device between rigid model and rigid-flexible coupling model.Then,based on the characteristics of excavator to create an excavator hydraulic system,and calculated the parameters of the hydraulic system through analysis of dynamic characteristic.And hydraulic system model was established in software AMESim,hydraulic system was debugged and verified,then built the co-simulation model by ADAMS and AMESim to analyze the dynamic characteristics of the working device.Finally,according to the results of the analysis of rigid-flexible coupling multi-body model,making topology optimization of working device,optimization object was stick.Under the optimized model to build the new model of rigid-flexible coupling,and researched on dynamic stress of new model.Last contrast dynamic structural strength between no optimized and optimized model.