Energy-saving Research On Linear Actuator Of Pressure Coupling System Based On Hydraulic Transformer

Along with the society,energy conservation and consumption reduction has always been an important direction for the development of each industry.Hydraulic technology is widely used,but energy utilization efficiency is not high.The pressure coupling system has great advantages in energy saving.The hydraulic transformer is one of the key components of this system.It can theoretically control the movement speed of the hydraulic actuator in the hydraulic system without the throttling loss.It also can recover the energy of the load,which has a very good application prospect.This paper mainly studies the gravitational potential energy of the linear actuator load by using a new hydraulic transformer,and establishes the simulation model of the system and carries out experimental verification.Firstly,according to the working principle diagram of the pressure coupling system,combined with the research characteristics of this subject,the working principle diagram of the energy-saving system was designed.According to the working characteristics of each component in the system,the secondary factors affecting the system's working effect are simplified.Established a mathematical model of the main components of the energysaving system.Then research on the theory of energy-saving system.The transformation ratio model and efficiency model of the hydraulic transformer were established,and the equalefficiency curve was analyzed.The total efficiency model of the energy-saving system is established.The results show that the highest efficiency can reach 60%,and the hydraulic transformer cylinder speed and angle range of swash plate corresponding to the highefficiency zone are large,which is beneficial to work with the hydraulic accumulator.The gas pressure change in the process of recovering energy from the hydraulic accumulator was analyzed.On the basis of ensuring the highest energy recovery efficiency of the system,the volume of the hydraulic accumulator is calculated by genetic algorithm with the minimum volume of the hydraulic accumulator as the optimization target.The value of the gas and the change in gas pressure during the recovery of the energy process complete the matching of the parameters of the hydraulic accumulator.The change of the transformation ratio of the hydraulic transformer in the energy recovery process is analyzed,and the motion curve of the swash plate angle in this process is calculated,that is,the motion curve of the output angle of the hydraulic oscillating motor.Then,the Simulink mathematical model of energy-saving system is established.According to the nonlinear characteristics of the system mathematical model,the fuzzy self-tuning PID control algorithm was used to control the motion speed of the load during the recovery of energy.The simulation results show that the motion response characteristics of the load are significantly improved.According to the characteristics of Simscape language,the physical model of hydraulic transformer is established.The physical model of energy-saving system was established in Simscape.The control strategy was proposed.The whole process of energy-saving system recycling and reuse of load potential energy was simulated.The results show the simulation results of the mathematical model are not much different,indicating the accuracy of the model.Finally,the energy-saving system test bench was built.The transformer pressure ratio and efficiency of the hydraulic transformer under different working conditions were tested.The energy recovery process of the hydraulic transformer was verified by experiments.The results show that the hydraulic transformer can drive the load in the forward rotation.It is also possible to achieve reverse rotation to recover load energy.