Construction method of equivalent analysis spectrum of fatigue cracking structure

A technology of fatigue cracking and equivalent analysis, which is applied in the field of fatigue testing, can solve problems such as incomplete and complex data of structural fatigue load spectrum, and achieve the effects of shortening the test period, less data, and simple compilation process

Active Publication Date: 2014-01-29
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of incomplete or overly complex structural fatigue load spectrum data in field fatigue crack troubleshooting, and to construct an equivalent analysis spectrum that can be used for fault analysis

Method used

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  • Construction method of equivalent analysis spectrum of fatigue cracking structure
  • Construction method of equivalent analysis spectrum of fatigue cracking structure

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Embodiment

[0030] The first step is to determine the key parts of fatigue, including the fatigue cracking part, the root of the pelvic fin connection angle bar of a certain type of aircraft and the bolt connection hole of the adjacent part of the pelvic fin connection angle bar, N 0 =5000 lifts, N 1 =660 landing numbers.

[0031] Step 2: Check the Aircraft Fatigue Manual, λ 1 Take the ground-air-ground damage ratio λ of the joint between the vertical tail and the fuselage of the Boeing 737 aircraft GAG =0.14,λ 2 Take the ground-air-ground damage ratio λ of the horizontal tail structure of Boeing 747 aircraft GAG =0.3,λ 3 Also take the ground-air-ground damage ratio λ of the horizontal tail structure of the Boeing 747 aircraft GAG = 0.8.

[0032]Step 3: According to the static strength aerodynamic load distribution, the structure mainly bears the bending moment M caused by the lateral aerodynamic force. Therefore, the lateral load distribution is calculated in sections, and the ave...

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Abstract

The invention belongs to the technical field of fatigue tests and relates to a construction method of an equivalent analysis spectrum of a fatigue cracking structure. The construction method is based on field data and accordingly the field reality can be reflected by the obtained equivalent analysis spectrum of the fatigue cracking structure. The spectral pattern is a uniform amplitude spectrum and accordingly the equivalent analysis spectrum can be applied to the improvement analysis and a contrast test without simplifying work of a load spectrum, the effectiveness of the improved scheme can be determined, and accordingly the test circle of a test can be significantly shortened. According to the construction method of the equivalent analysis spectrum of the fatigue cracking structure, the problem that structure fatigue load spectrum data are not complete or too complicated in field fatigue crack troubleshooting is solved.

Description

technical field [0001] The invention belongs to the technical field of fatigue tests, and relates to a method for constructing an equivalent analysis spectrum of a fatigue crack structure. Background technique [0002] Troubleshooting fatigue cracking of the aircraft field structure is a very important work content of aircraft service support, and after the failure occurs, cause analysis and structural improvement need to consume a lot of manpower, material resources and time. Angle and time are particularly critical, and the premise of finding the cause and completing the improved design is to have the analysis spectrum of the corresponding structure. The problem we are facing now is that the fatigue load spectrum data of the structure with fatigue cracks is often incomplete, and flight measurements are required, or other The fatigue load spectrum is relatively complex, and it takes a long period of time to do relevant analysis and improve the confirmatory test. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 雷晓欣张彦军李小鹏
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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