Abstract
In the hydraulic loading system, the performance of digital relief valve plays an important role in the dynamic response of load. However, the research on large-flow emulsion relief valve is still far from perfect. In this paper, digital relief valve is taken as the research object. Based on pilot-operated relief valve, a digital control scheme using a linear stepping motor is adopted to regulate the working pressure of relief valve. The structure of relief valve is analyzed and optimized from the aspects of dynamic and internal flow field characteristics to obtain a good working performance. To obtain its accurate working characteristic, the structural model and digital control system of relief valve are established by AMESim and Simulink, respectively, for electrohydraulic cosimulation. The results show that digital relief valve has a better characteristic of real-time dynamic pressure regulation. Therefore, the digital control system could improve the dynamic performance of relief valve, and the design of digital relief valve structure is reasonable and feasible. The simulation method employed in this paper provides a better theoretical basis and reference for the comprehensive research of digital large-flow emulsion relief valves based on the hydraulic loading system.
Highlights
In the hydraulic loading system, the power to weight ratio of the hydraulic components is large, the rigidity of antiload is large, the response of the system is fast, and the adaptability is good. erefore, the hydraulic loading system applied to the loading system of product performance test-bed is obvious, especially in the medium- and highpower transmission system [1, 2]. e principle of the hydraulic loading system is to transform mechanical energy of the tested transmission system into hydraulic energy to realize passive loading. e adjustment of loading is carried out by digital relief valve; the performance of digital relief valve plays a key role in the dynamic response characteristics of the load
For the relief valve applied to the emulsion pumping station, the influence of different structural parameters on the working characteristics of relief valve is obtained by AMESim [20]. is paper mainly focuses on working characteristics of the relief valve applied to the hydraulic loading system
By analyzing the optimized structure model, the time to reach stability reduced by 27.8% and the pressure overshoot decreased by 45.5% when compared to the results before optimization. e analysis results obtained by Simulink simulation showed that relief valve had good performance
Summary
In the hydraulic loading system, the power to weight ratio of the hydraulic components is large, the rigidity of antiload is large, the response of the system is fast, and the adaptability is good. erefore, the hydraulic loading system applied to the loading system of product performance test-bed is obvious, especially in the medium- and highpower transmission system [1, 2]. e principle of the hydraulic loading system is to transform mechanical energy of the tested transmission system into hydraulic energy to realize passive loading. e adjustment of loading is carried out by digital relief valve; the performance of digital relief valve plays a key role in the dynamic response characteristics of the load. Many scholars have done a lot of research on the characteristic analysis of relief valve by theoretical and test studies Franc used both analytical and numerical approaches to design a two-stage pressure-relief valve and tested its performance, and it was found that it is appropriate for use in a water-hydraulics system [3]. Some scholars analyzed the dynamic characteristics of the pilot-operated relief valve by theoretical method and Simulink simulation [9,10,11,12,13,14]. Some scholars analyzed the dynamic characteristics of the pilot-operated relief valve by the theoretical method and AMESim simulation [15,16,17,18,19]. Digital relief valve will be comprehensively analyzed from the aspects of its dynamic characteristics, flow field distribution characteristics, and electrohydraulic cosimulation analysis
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