| Compared with power transmission systems, there are several problems with traditional hydraulic drive system in multi-actuators field, such as difficulty in pressure-boost, throttling loss, and poor load matching. The Switch-mode Hydraulic Power System controls on-off valve through electrical signal, with characteristics of controlled pressure transformer ratio, simple structure and low loss. Besides, its good load adaptability makes it an ideal high-efficiency hydraulic supply for multi-load. While at present, this Switch-mode Hydraulic System is not yet fully studied, especially in the affecting of system components parameters and the output characteristics between systems combined with different hydraulic inductance and capacity, which are still lack of comprehensive research and analysis.Start with similarities between the power transmission and hydraulic drive system, some research including theoretical analysis, system modeling & simulation, test system design & building were done this paper. And these efforts all revolve around the principle, characteristics and related affecting factors of Switch-mode Hydraulic Power System.Based on the electro-hydraulic simulation theory, the correspondence between the hydraulic inductance, hydraulic capacity, hydraulic switching element with circuit elements was discussed in this paper, and theoretical formulas were established by analyzing; On the basis of the relevant principles and reference on switching power supply, a Switch-mode Hydraulic Power System composed of hydraulic inductance, hydraulic capacity and high-speed on-off valve was built, and the implementation principle and characteristics of it were analyzed.Utilizing AMESim software, Switch-mode Hydraulic Power System simulation model was set up. After parameter debugging, the results proved the feasibility of relevant principles with the boosting system pressure controlled by PWM. Based on this model, analysis of different hydraulic capacity’s and inductance’s effect on system was done, and relationships between relevant elements parameters and the system output, such as output pressure, dynamic balanced time, speed and pressure fluctuation were drawn.Based on the study on individual element’s characteristics, systems combined with different hydraulic inductances and capacities were built for comprehensive comparison and analysis, while features, advantages and disadvantages of different systems were given on pressure boosting, dynamic response and output fluctuation, which may has some reference value for system optimum design. Simulation of the Switch-mode Hydraulic Power System’s application on a multi-load field showed that the system also had a stable and controllable output characteristic when there is a load change or a load control policy change.Combined with hydraulic transmission theory and the simulation results, a test system for Switch-mode Hydraulic Power were designed and built, with the ability of multi-signals acquisition and processing including pressure, flow, speed, displacement and so on. By using the visualization software written in LabVIEW, test parameters can be adjusted in real-time while operating results can be displayed synchronously, which providing a hardware platform support for the theoretical and simulating analysis.Through this study, the systematic performance characteristics of Switch-mode Hydraulic Power System was showed, and the work of the test platform system design & building was completed, offering a good reference and support for the system’s further research and engineering application. |
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