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.

中文翻译：

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基于液压加载系统的数字式乳化安全阀特性分析

在液压加载系统中，数字安全阀的性能在负载的动态响应中起着重要作用。但是，大流量乳化减压阀的研究还很不完善。本文以数字溢流阀为研究对象。在先导式溢流阀的基础上，采用线性步进电机的数字控制方案来调节溢流阀的工作压力。从动态和内部流场特性两方面对溢流阀的结构进行了分析和优化，以获得良好的工作性能。为了获得准确的工作特性，分别由AMESim和Simulink建立了安全阀的结构模型和数字控制系统，以进行电液协同仿真。结果表明，数字溢流阀具有较好的实时动态压力调节特性。因此，数字控制系统可以提高安全阀的动态性能，数字安全阀的结构设计是合理可行的。本文所采用的仿真方法为基于液压加载系统的数字大流量乳胶溢流阀的综合研究提供了较好的理论基础和参考。