Design And Research Of Hydraulic Pump (Motor) Reliability Test Bench Based On Power Recovery

As the key hydraulic component for construction machinery,the performance and life of heavy equipment are decided by hydraulic pump(motor)reliability.Hydraulic pump(motor)reliability experiment has the characteristics of long testing period and big power-consumption.Traditional reliability test bench often use overflow valve as the load,which results in the increasing of power-consumption and test cost.Therefore,research of power recovery system in hydraulic pump(motor)reliability experiment has important significance.Aimed at the power-consumption of reliable and long life hydraulic pump(motor)in the reliability experiment,a kind of hydraulic pump(motor)reliability test bench is designed based on electrical power recovery.A new design concept of hydraulic reliability test bench is given and the cost of reliability evolution with multi-type hydraulic pump(motor)for equipment manufacturing equipment industry is saved by design of proposed test bench.On the basis of analyzing considerable parameters of hydraulic pump(motor)for construction machinery,combining test conditions and methods ruled by test standards,the max parameters of hydraulic pump(motor)are given.Principles of load with different power recovery methods are analyzed.The power recovery ratio of system is computed,and an electrical power recovery design method of hydraulic pump(motor)reliability test bench based on common DC bus is proposed.Design parameters of hydraulic system are determined by technique data of reliability test bench.Particular design and calculation of hydraulic system function circuit are carried out.Program of measurement and control system with test bench is designed based on PCIE bus and Profinet bus.Moreover,control systems are designed,which include data collection,strong power and weak power.Geometric model of test bench is established by Pro/E,and elasticity modulus of vibration isolator is analyzed and derived.Modal and harmonic response analysis of asynchronous servo motor installation platform are analyzed by ANSYS,then vibration isolation efficiency of of structure is 52%.Dynamic characteristic of structure is analyzed under driving frequency,and vibration sensitive areas of installation platform are found out.Multi-objective optimization for structure dimension is carried out based on response surface optimization.The performance of structure is improved after optimization.Simulation model of hydraulic system and power recovery system are established by AMESim and Matlab/Simulink,and validity of simulation model is validated by the comparing start condition and generate electricity of motor.Constant speed load control method for hydraulic pump(motor)reliability experiment is proposed to solve the problems which widely exist in hydraulic pump(motor)reliability test,such as high energy consumption and long time.Dynamic and static performances and energy recovery performance of system are analyzed under different experiment situation of constant speed control method.The maximum energy recovery efficiency can reach to 63%.