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Accelerated life test method of aircraft brake system

An accelerated life test and brake system technology, which is applied in the field of accelerated life test to test the performance of the aircraft brake system, can solve the problems of high test cost and long test cycle

Inactive Publication Date: 2012-07-11
XIAN AVIATION BRAKE TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of long test period and high test cost in the prior art, the present invention proposes an accelerated life test method for the aircraft brake system

Method used

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  • Accelerated life test method of aircraft brake system
  • Accelerated life test method of aircraft brake system
  • Accelerated life test method of aircraft brake system

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Embodiment Construction

[0069] This embodiment is to carry out the accelerated life test on the braking system of civil aircraft. The purpose of the test is to determine the life index and reliability index of the brake system. The service life requirement of the brake system in the flight test stage is 1200 landings, and the reliability requirement is MTBF=700h. The take-off and landing time of a regional airliner is 1 hour.

[0070] The control box of the aircraft braking system that is carried out accelerated life test in the present embodiment must pass through low temperature working stress limit test, high temperature working stress limit test, vibration working stress limit test and high accelerated stress screening, and determine the attained by accelerated reliability test Reliability index; and the diameter of the fixed orifice in the servo valve in the brake system is 0.19 mm to 0.24 mm, and the gap between the nozzle and the baffle is 0.035 mm to 0.06 mm.

[0071] The test equipment use...

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Abstract

The invention relates to an accelerated life test method of an aircraft brake system. The environment conditions of applying temperature stress, vibration stress and the like in a combined way are adopted, the operating conditions are added and the operating frequency of the whole system are increased during the test process, so that the hidden fault dangers of the brake system are stimulated, and the test time is shortened. The method is circularly carried out according to the test profile during the test process until the required reliability index is reached. The power-on operating conditions, the brake applying pressure operating conditions and the rotating speed change conditions in use are converted into the test time according to the applied operating frequency, and the operating frequency adopted in the test is greater than the actual operating frequency in use. The reached reliability index is assessed according to the method in GJB1407 and recommended degree of confidence after the test is finished, and the degree of confidence for assessing the reliability index is 90%; and the empirical coefficient of life assessment is 1.5. The purpose of performing the accelerated life test on the brake system is realized by verifying whether the brake system has hidden fault dangers under various operating states.

Description

technical field [0001] The invention relates to the field of aircraft brake systems, in particular to an accelerated life test method for testing the performance of the aircraft brake system during the test. Background technique [0002] There are two current reliability test methods, one is carried out according to GJB899 "Reliability Identification and Acceptance Test", which is used to determine whether the product or system meets the specified reliability requirements; the other is according to GJB1407 "Reliability Growth Test" 》It is used to improve the reliability index of the product or system through the test. [0003] According to the method of reliability test according to the existing standard, the use time and the test time have a corresponding relationship of 1:1. Due to compliance with the real environment timing, when the reliability index MTBF of the brake system is 700h, the reliability test is carried out according to the GJB899 standard test plan. The tes...

Claims

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Application Information

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IPC IPC(8): B64F5/00G01M7/02B64F5/60
Inventor 乔建军田广来梁力魏张斌张谦柯少昌商海东刘忠平马建峰邵养鹏郭育秦
Owner XIAN AVIATION BRAKE TECH
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