Dual Source Integrated Driving for Hydraulic Excavator Swing System

Abstract

Generally, during the accelerating process of construction machinery large inertia hydraulic swing system, a lot of kinetic energy is accumulated, and it will be eventually dissipated through the relief valve orifice during the decelerating process, which results in serious energy waste and large overflow loss. In order to solve this problem, a new dual source hydraulic motor with non-uniform flow distribution is proposed, which can drive high-frequency swing mechanism efficiently. The new dual source hydraulic motor has two groups of oil inlet and outlet, corresponding to two groups of different displacement. The two groups of inlet and outlet are respectively connected with the energy recovery unit and the main driving unit. During the starting process, the energy recovery unit assists the main driving unit to drive the swing mechanism together, so that the main drive unit output torque and overflow loss are reduced; during the braking process, the energy recovery unit recovers the braking energy. Finally, the integrated control of braking energy direct recovery and utilization is realized. In the research, the 38 t hydraulic excavator is taken as the research object. Firstly, the multi-body dynamics electro-hydraulic simulation model of the dual source integrated driving hydraulic excavator swing system is established, and the accuracy of the model is verified by experiments. Then the effects of the accumulator working pressure and the dual source hydraulic motor displacement ratio on the working performance of the system were simulated. The simulation results show that with the displacement ratio increasing, the accelerating time, the maximum angular velocity and decelerating time increase. Compared with the original system, when the displacement ratio  is 0.6, the comprehensive performance of the system is the best, and the hydraulic pump output energy is reduced by 48.6% and 46.6% respectively in the process of full load and no-load operation.

Practical adaptive robust tracking control of the dual-valve parallel electro-hydraulic servo system with reduced-order model

“…Hydraulic systems are pervasively used in large construction machinery (Huang et al, 2021; Tong et al, 2020), industrial equipment (Liu et al, 2020), and various kinds of mobile machinery (Padovani et al, 2020) due to their large power-to-size ratio, the ability to generate large force or torque, and simple structure. In existing hydraulic systems among mobile machinery, large-flow proportional valve with inferior dynamic performance is widely adopted, which is hard to meet the requirement of higher tracking accuracy and higher efficiency.…”

Experimental Tests on the Influence of Accumulated Pressure Energy on the Response Time of a Hydraulic Cylinder under External Load Actuated in a Classic and Distributed System Structure

“…Research is currently performed into improving the operating characteristics by implementing a series of control solutions without manipulating the structure of the hydrostatic system [15][16][17][18][19][20]. Another, parallel research direction is to modify the classic structure of the system by adding a system which would allow the accumulation and reuse of the hydraulic energy, thus increasing the efficiency of the entire system [21,22]. However, it seems that the most interesting research direction is the one in which modifications are introduced into the classic architecture of the system.…”

Research into a Marine Helicopter Traction System and Its Dynamic Energy Consumption Characteristics

“…Concurrently, in recent years, numerous scholars have undertaken research into the diverse shipborne equipment of helicopter traction systems, encompassing aspects such as aerodynamics [15][16][17][18], multibody dynamics [19][20][21], system reliability [22], and path planning [23,24]. However, presently, the issue of [25] high-energy consumption by the current helicopter traction systems when transporting shipborne helicopters [10,26], presenting substantial stress to the vessel's energy supply system, and the intricate entanglement of traction steps during task execution are underrated. Essentially, both issues are attributed to the utilization of hydraulic components for the power source within the helicopter traction system, resulting in uncontrollable traction movement speed.…”