Testing device and testing method for servo valve pollution sensitivity measurement

Abstract

The invention discloses a testing device and a testing method for servo valve pollution sensitivity measurement. The testing device comprises a monitoring device and a test bench for mounting a testedservo valve, wherein the test bench comprises an oil supply device for supplying oil to the tested servo valve, a cleaning filter for filtering hydraulic oil at an oil returning port of the tested servo valve, and a dust solution tank for collecting the hydraulic oil at the oil returning port of the tested servo valve and accommodating a dust solution. The testing method comprises the following steps: 1, performing a test bench pollution particle generation measurement test; 2, performing a tested servo valve pollution particle generation measurement test; 3, performing tested servo valve pollution sensitivity measurement; 4, cleaning the test bench. The testing device is reasonable in design, easy and convenient to use and operate and good in using effect; measurement of servo valve pollution sensitivity can be easily, conveniently and quickly completed; the testing precision is relatively high.

Description

technical field [0001] The invention belongs to the technical field of measuring the pollution sensitivity of a hydraulic servo valve, and in particular relates to a test device and a test method for measuring the pollution sensitivity of a servo valve. Background technique [0002] The servo valve is the hydraulic control servo valve, mainly refers to the electro-hydraulic servo valve, which outputs the modulated flow and pressure after receiving the electrical analog signal. The hydraulic servo valve is widely used in various hydraulic servo control systems, especially in In the aircraft wheel brake control system, the servo valve is used to control the output braking force of the aircraft brake system. It is required that the brake control servo valve should have high dynamic response characteristics, including: dead zone characteristics, saturation characteristics, linearity characteristics, drive The above indicators are important basis for measuring the dynamic respons...

AI Technical Summary

Problems solved by technology

Contamination particles can cause blockage of the key flow holes inside the servo valve, stick to the working surface, cause the degradation of the dynamic characteristics of the servo valve, and ultimately affect the working life and reliability of the servo valve

[0004] At present, the service life and reliability of servo valves in domestic aircraft braking systems are generally low, and servo valve failures often occur in practical applications, resulting in failure of the braking system

The reason lies in the improper design of the matching clearances and apertures inside the servo valve, and the failure to consider the impact of pollution particles on the servo valve. In the design, there is also a lack of evaluation of the servo valve’s resistance to particle pollution under actual working conditions. Competence Comprehensive Evaluation Criteria and Means

[0005] In terms of testing, although the servo valve design requirements will refer to the particle pollution level specified in GJB 420B-2006, it will be proposed how long the servo valve should be able to work without failure under a certain pollution level (for example: the specification is in GJB420B - Under the condition of Class 9 in 2006, the servo valve should be able to guarantee the MTBF value of 10800FH, and the service life is 10 years), but in the specific operation process, because the hydraulic test bench itself will produce metal particles during operation, and the set in the system The hydraulic oil filter will continue to filter the particle pollution in the oil, so during the test verification process, the degree of pollution of the hydraulic oil passing through the servo valve will decrease with the progress of the test, that is, "the oil becomes clean", so even if it passes 1:1 fully simulates the real working cycle time of the servo valve. Due to the large deviation of the pollution degree of the hydraulic oil from the design requirements, the obtained test results cannot represent the real performance and life of the servo valve.

But now, there is no special test device that can test the pollution sensitivity of servo valves, and the existing servo valves have different degrees of inconvenient test operation, low test efficiency, and low test accuracy. defects and deficiencies

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