Research And Develop The Distributed Test System For Electrohydraulic Servo Valve

Traditional manual testing system which has complex structure, high cost, high failure rate and low accuracy, is far from the testing demand of modern hydraulic elements and devices. In order to resolve the problem, this paper designs and exploits a distributing test system to be used to test electrohydraulic servo valve. This system consists of hydraulic test bench, and PC control system. Automatization test is executed by collaboration of PC, PLC and touch panel. PLC manages the bottom system and connects the low speed data. PC connects the high and low speed data, and processes data. This kind of model not only exploits the advantage that PLC has high control accuracy, strong anti-interference capacity and good reliability, but also makes full use of the good data analyzing and processing of IPC. Remote monitor function that allows a few remote users monitor the test process from a distance at the same time is the typical point of the paper.In chapter 1, an overall summary of hydraulic testing technology and remote monitoring technology are given. Explicate the research background, significance and contents of the project.In chapter 2, introduce the capability target of electrohydraulic servo valve and the structure of its hydraulic test bench. Design the test system scheme. Explicate every layer's function of test system. Bring forward the software and hardware composing of PLC and PC.In chapter 3, introduce the frequency response characteristic test system based on correlation principle. Study the key technology, including signal compound by software, high speed data collection, position deviation rectify, signal processing.In chapter 4, explain the solution of distributing communication, frame the communication protocol and format, and present the mechanism to decide who will control the test bench when many users want to at the same time.In chapter 5, define the function of the software test system. Design the function frame, and show the interface of the software. Design the all-purpose interface circuit and anti -jamming measure.In chapter 6, validate the test bench's integrality and reliability by two typical experimentations.In chapter 7, summarize and review this paper, then give the possible research orientation in future.