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
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[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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