Flow Matching Design Of Truck Crane Luffing And Winch Systems Based On Mechanical And Hydraulic Coupling

As one of the most widely used construction machinery,truck crane plays an important role in urban construction.With the continuous development of industrial technology,intelligent,energy-saving and simple operation has gradually become the future development trend of truck crane.At present,the hydraulic system of truck crane generally adopts the load sensing system of mechanical-hydraulic feedback,which is difficult to meet the requirements of maneuverability and energy saving.The electro-hydraulic flow matching system which combines electronic control hydraulic components with electronic controller can give full play to the flexibility of electro-hydraulic control and has great potential in realizing crane handling improvement and energy saving.In this paper,the truck crane is taken as the research object,and the digital prototype model of the truck crane is established through AMESim and ADAMS co-simulation.Based on the experimental verification and model optimization,the key factors affecting the stability and energy consumption of luffing and winch system are systematically studied.Furthermore,the electro-hydraulic flow matching control system based on the maximization of valve opening is proposed,which effectively improves the maneuverability of truck crane and reduces the energy consumption of the system.The main research work and content of this paper are as follows:(1)The dynamic performance test and structural measurement of the key pump and valve components of the hydraulic system of the truck crane are carried out.The numerical simulation model of the key pump and valve components is established in the AMESim software by using the component-level modeling method.The dynamic performance test results verify the numerical simulation model.The accuracy of the calculation is less than 8%.On this basis,the simulation model of the luffing and winch hydraulic system of the truck crane is established,and the influence of the control pressure of the pressure compensation valve,the control pressure of the load-sensitive pump and other parameters on the dynamic characteristics of the luffing and winch system is studied.The optimization of the prototype model lays the foundation.(2)In order to reflect the working characteristics of truck cranes more realistically,through AMESim/ADAMS co-simulation,a digital prototype model of luffing and winch system considering machine-hydraulic coupling characteristics was established,and the dynamic characteristics of the system under different working conditions were analyzed.The dynamic performance test platform of the truck crane was built,and the dynamic characteristics under various working conditions were tested in real crane and compared with the simulation results of the digital prototype.The results show that the calculation error of the digital prototype model is less than 10%,which meets the engineering requirements.The digital prototype can be used in the research on the electro-hydraulic flow matching strategy to reduce the cycle and cost of product development.(3)The flow matching control strategy based on the maximization of valve opening is proposed.Based on the digital prototype model,the dynamic characteristics and energy efficiency characteristics of load sensing system and electro-hydraulic flow matching control system were compared and analyzed under typical working conditions.The results show that: The flow matching control strategy based on the maximization of valve opening can effectively reduce the energy consumption of the system without changing the dynamic performance indexes of the luffing and winch system.The energy consumption of the system can be reduced by about 22.2% in full speed lifting boom condition,about 20.4% in idle speed falling hook condition,and about 11.3% in idle speed lifting boom and falling hook compound condition.