Multi-variable coupled mechanism and kinetic energy stiffness analysis method for a mechanical-electrical hydraulic system
ZHAO Song1 GU Lichen1,2 YANG Bin1
1. State Engineering Lab of Highway Maintenance Equipment, Chang’an University, Xi’an 710064, China;
2. School of Mechatronic Engineering, Xi’an University of Architecture and Technology, Xi’an 710054, China
Aiming at the urgent demand of performance reliability analysis and evaluation method for a mechanical-electrical hydraulic system, the coupled mechanism of multi-energy-domain parameters under the combined action of load condition and power source was analyzed. The function-effect chain among mechanical, electrical and hydraulic subsystems was established. Based on the above theoretical basis, the analysis method of kinetic energy stiffness（KES）suitable for the mechanical-electrical hydraulic system was proposed. The changing law of the system’s KES under the action of multi-source parameters was revealed. Taking a typical mechanical-electrical hydraulic system-variable speed pump controlled motor system as the study object, its mathematical model was built. The effect mechanism of multi-energy-domain parameters on the system’s running states was analyzed. The physical meaning of KES and its important meaning to evaluation of the mechanical-electrical hydraulic system’s running states were presented. In order to measure KES, the magnitude of KES was calculated with the change rate of multi-source signals of the system. The theoretical analysis and test results indicated that KES is the inner multi-variable coupled effect of the mechanical-electrical hydraulic system, it varies with multi-energy-domain parameters; according to different excitation sources, KES can be divided into forward KES and reversed KES, they can be the evaluation indexes for the system’s anti-power source varying and anti-load disturbance performances, respectively; on-line detecting and controlling the “rigid-flexible” matching process of the system’s KES can effectively safeguard the running performance reliability of the mechanical-electrical hydraulic system.
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