基于虚拟仪器的电液伺服阀测试系统研究

发布时间：2018-07-26 13:32

【摘要】： 电液伺服阀是电液伺服系统中的关键元件，其静态和动态特性测试在电液伺服系统的理论与实验研究中具有十分重要的意义。随着计算机辅助测试(CAT)技术的发展，电液伺服阀性能测试技术取得了很大进步，而虚拟仪器技术的出现，更使电液伺服阀性能测试技术达到了一个新的高度。本文将虚拟仪器技术和电液伺服阀性能测试技术结合起来，利用图形化软件工具—LabVIEW，，研制开发出了基于虚拟仪器的电液伺服阀性能测试系统，对电液伺服阀的静、动态特性测试原理和方法进行了讨论和研究，以MOOG伺服阀为测试对象进行了静态特性测试和试验结果分析，验证了所开发的电液伺服阀测试系统设计方案的合理性。本文首先在介绍电液伺服阀特性和测试远离以及虚拟仪器技术的基础上，提出了基于虚拟仪器的电液伺服阀测试系统设计方案，以此方案研制了测试系统的液压试验单元和测控单元。然后根据电液伺服阀的液桥理论提出了一种负载流量低压测量方法，在所开发的测试系统上，利用电液比例阀模拟流量测量装置对所提出的方法进行了试验验证，实现了利用低压流量计和压力传感器进行电液伺服阀负载流量特性和空载流量特性的测量。最后在对电液伺服阀性能测试试验研究的基础上，提出了一种基于虚拟仪器的电液伺服阀故障诊断方法，并进行了模拟试验研究，取得了预期效果。本系统在Windows XP系统下采用LabVIEW6.1软件编制了系统软件，人机界面友好，程序简单，容易阅读和维护。信号源和测试功能由软件编程实现，减少了实际仪器，降低了系统成本。
[Abstract]:Electro-hydraulic servo valve is a key component in electro-hydraulic servo system. The measurement of its static and dynamic characteristics is of great significance in the theoretical and experimental research of electro-hydraulic servo system. With the development of computer-aided testing (CAT) technology, the performance testing technology of electro-hydraulic servo valve has made great progress, and the appearance of virtual instrument technology has made the performance testing technology of electro-hydraulic servo valve reach a new height. In this paper, the virtual instrument technology and electro-hydraulic servo valve performance test technology are combined, and the performance test system of electro-hydraulic servo valve based on virtual instrument is developed by using graphical software tool-LabVIEW. The principle and method of dynamic characteristic testing are discussed and studied. The static characteristic test and test result analysis of MOOG servo valve are carried out, which verify the rationality of the design scheme of the electro-hydraulic servo valve test system developed in this paper. Based on the introduction of electro-hydraulic servo valve characteristics, test distance and virtual instrument technology, a design scheme of electro-hydraulic servo valve testing system based on virtual instrument is proposed in this paper. The hydraulic test unit and the measuring and controlling unit of the test system are developed. Then, according to the bridge theory of electro-hydraulic servo valve, a low pressure load flow measurement method is proposed. The proposed method is tested and verified by using the electro-hydraulic proportional valve analog flow measurement device on the developed test system. The load flow characteristics and no-load flow characteristics of electro-hydraulic servo valve are measured by low pressure Flowmeter and pressure sensor. Finally, on the basis of the test and research on the performance of electro-hydraulic servo valve, a fault diagnosis method of electro-hydraulic servo valve based on virtual instrument is proposed, and the simulation experiment is carried out, and the expected effect is obtained. The system is programmed with LabVIEW6.1 software under Windows XP system. It has friendly man-machine interface, simple program, easy to read and maintain. The signal source and testing function are realized by software programming, which reduces the actual instrument and the cost of the system.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2004
【分类号】：TH137

【引证文献】