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A Load Spectrum Design Method for Accelerated Life Test Based on Markov Information Matrix

A technology of Markov information and Markov matrix, applied in computing, computer components, instruments, etc., can solve problems such as accelerated life tests of aviation hydraulic pumps, and achieve the effect of shortening the test time and increasing the load level

Active Publication Date: 2019-09-27
BEIJING QTCREATE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of the closed policy adopted by foreign countries on my country's related technologies, we have no way of knowing how to design the accelerated life test profile of foreign aviation hydraulic pumps. The research on accelerated life test of aviation hydraulic pumps in my country has just started. Design method of load spectrum for accelerated life test of applied aviation hydraulic pump

Method used

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  • A Load Spectrum Design Method for Accelerated Life Test Based on Markov Information Matrix
  • A Load Spectrum Design Method for Accelerated Life Test Based on Markov Information Matrix
  • A Load Spectrum Design Method for Accelerated Life Test Based on Markov Information Matrix

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Embodiment

[0061] The load spectrum of the accelerated life test of a certain type of aviation hydraulic pump is designed as follows:

[0062] First of all, the rated pressure of the pump is 21MPa, the rated speed is 4200rpm, and the flow of each grade is shown in Table 1.

[0063] Table 1 Flow demand table for each flight stage

[0064]

[0065] by Figure 7 The SAE-AS19692B aviation general hydraulic pump general test standard shown, the statistics of the load switching frequency information of this type of hydraulic pump, and the statistics of the flight data of a certain flight, obtain the duration information of each flight state, such as Figure 8 As shown, the Markov information matrix shown below can finally be obtained. According to the analysis of the user's flow demand of the hydraulic system, the matrix E is output.

[0066]

[0067]

[0068] Using the hidden Markov model, the conventional load spectrum of the hydraulic pump flow load changing with time can be obtained, such as Pict...

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Abstract

The invention discloses a design method of accelerated life test load spectrum based on Markov information matrix, which is applied to the reliability field of aviation airborne equipment. This method uses the Markov information matrix method to count the loads of mechanical products under alternating stress, and takes into account the cumulative effect of loads and the impact of switching shocks. The hidden Markov model is used to solve the problem that the actual loads such as aviation hydraulic pumps cannot be obtained directly. The hydraulic pump flow loads are solved. Based on the cumulative damage theory, the load spectrum of the accelerated life test is designed. The method of the invention realizes the accelerated life test of the aviation airborne equipment without changing the failure mechanism of the aviation airborne equipment, and obtains a good acceleration effect.

Description

Technical field [0001] The invention belongs to the field of reliability of aviation airborne equipment, and in particular relates to a method for designing an accelerated life test load spectrum based on a Markov information matrix. Background technique [0002] Modern aircraft require ultra-high reliability and ultra-long life. As the core component of the aircraft hydraulic system, aviation hydraulic pumps have stricter requirements than ordinary hydraulic pumps. The hydraulic pump provides high-pressure oil up to 21-35MPa for the aircraft hydraulic system to drive the flight control rudder surface or retract the landing gear. Its structure is complex, powerful, and life and reliability requirements are getting higher and higher. Once an aircraft hydraulic pump fails, it can cause the aircraft hydraulic system to work abnormally, or cause the aircraft to crash and kill people, bringing huge economic losses and adverse social impacts. Therefore, modern aircraft have more requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06K9/62
CPCG06F30/15G06F30/17G06F18/295
Inventor 王少萍马仲海张超孙旭
Owner BEIJING QTCREATE TECH