摘要
计算机辅助测试(Computer Aided Test)技术是电子计算机技术与常规测试系统相结合的一门综合性技术。电液伺服阀静、动态特性指标的测试在工业生产中有着极为重要的意义。计算机辅助测试技术的兴起和应用,为电液伺服阀性能测试开辟了广阔的发展前景。
燕山大学液压综合实验台是一个大型的液压测试系统,本系统由国家液压元件质量监督检测中心研制开发;其中,电液伺服阀的性能测试部分由燕山大学自己开发。我们在该实验台伺服阀液压回路的基础上,利用目前流行的LabVIEW软件,完成了电液伺服阀静、动态特性计算机辅助测试系统的研发。
本系统涉及的相关理论主要有数据采集与处理、信号与系统、数字信号处理、自动控制、仪器仪表、电工电子、液压传动、液压伺服控制、机械加工等。针对FF102型伺服阀进行了静、动态特性测试,并对测试结果进行了分析。
在动态测试方面,分别测试了伺服阀频率特性、阶跃响应特性。并在频率特性的测试中,我们用扫频法、统计法两种方法进行了测试。在伺服阀静态特性方面,完成了伺服阀的压力增益特性、空载流量特性、负载流量特性及泄漏特性的测试。与传统测试方法相比,采用LabVIEW软件开发电液伺服阀静、动态测试系统,使本测试系统实现了自动化。
该套软件人机界面友好,程序结构清晰,易于阅读与维护。在实验过程中所需的全部激励信号,采用LabVIEW软件编程结合采集卡硬件进行开发。节省了实际物理仪器,大幅度降低了系统成本,大大缩短了实验时间。
The technology of Computer Aided Test is a comprehensive technology which is combined with common testing technology. Electro-hydraulic servo valve test is of very importance in industrial production. The application of computer-aided test provides a brilliant future for characteristic test of servo valve and the technology of virtual instruments brings CAT into a new developing stage.
The Yanshan University hydraulic pressure comprehensive test bedstand is a large hydraulic pressure test system which is developed by National hydraulic component detecting center. In the whole system, servo valve characteristic test is finished by us. On the basis of test bedstand hydraulic loop, we’ve developed the servo valve static and dynamic state characteristic test system by mean of software LabVIEW which is very popular now.
The relevant theories include data acquisition and processing, signal and system, digital signal processing, automatic control, instruments and electronics, hydraulic transmission and control, machining etc. Statistic and dynamic state Characteristic of FF102 servo valve is tested and its results are analyzed.
In electro-hydraulic servo valve dynamic state characteristic test, frequency characteristic and step response characteristic are tested. frequency sweeping and statistics are applied in frequency characteristic test. In static state characteristic test, pressure gain characteristic, runoff characteristic with load, runoff characteristic without load and leakage characteristic are completed. Compared with the conditional testing method, the application of LabVIEW software in the electro-hydraulic servo valve dynamic and static state characteristic test system automates this testing system.
The interface of LabVIEW is friendly and program structure is clear and easy to maintain. During the course of the test, all the stimulating signals are made by LabVIEW software programming which is combined with data acquisition card. Through these configurations, the whole test saves real instruments, decreases the cost and shortens the test time greatly.
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