A lightweight design method of a landing gear brake component

A lightweight design and landing gear technology, applied in the field of aircraft landing gear, can solve the problems of not considering fatigue life, falling into local solutions, low efficiency, etc., and achieve the effect of improving safety and maneuverability, and optimizing the process reliably

Active Publication Date: 2019-01-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] Throughout the existing literature, about combining approximate models and intelligent optimization algorithms for lightweight design of landing gear structures, the optimization algorithms in some literatures are relatively traditional, with high reliability but low efficiency; some literatures use experimental design methods with sample uniformity is

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  • A lightweight design method of a landing gear brake component
  • A lightweight design method of a landing gear brake component
  • A lightweight design method of a landing gear brake component

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0038] Such as figure 1 As shown, the present invention provides a method for lightweight design of landing gear brake components based on response surface model and multi-island genetic algorithm, comprising the following steps:

[0039] Step 1: Considering the safety factor, the mises stress range of the brake component that meets the normal functional requirements of the landing gear is given as σ max ≤0.67σ b , σ b is the strength limit of the material used, and the range of fatigue life K is 1.5K a ≤K≤2K a , K a Design fatigue life for the original;

[0040] Step 2: Determine the variation range of the brake component design variables, such as figure 2 Shown: the outer diameter of the lug D∈[D 1 ,D 2 ], cross beam longitudinal width K 1 ∈[K 1a , K1b ], cross beam transverse width K 2 ∈[K 2a , K 2b ], the longitudinal thickness of the cr...

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Abstract

The invention discloses a lightweight design method of a landing gear brake component based on a response surface model and a multi-island genetic algorithm. The lightweight design method comprises the following steps: 1, the ranges of mises stress and fatigue life of the brake component which satisfy the normal function requirements of the landing gear are given; 2, variable range of the brake component design variables is determined; 3, combining the design variables, mises stress and fatigue life, the constraint conditions are given and the objective function is established. 4, an optimal Latin hypercube test design method is adopted to select sample point; 5, comprehensive parameters of the brake component are calculated according to the sample point parameters, including the componentmass, the fatigue life and the maximum mises stress; 6, combining M group of sample points and M group of comprehensive paramete data of brake components, a fourth-order response surface model is established by adopting a complete search mode; 7, based on the established response surface model, multi-island genetic algorithm is used to optimize the lightweight structural design problem, and the optimal solution is selected as the final structural optimization parameters in the convergent solution.

Description

technical field [0001] The invention belongs to the technical field of aircraft landing gear, and in particular relates to a lightweight design method for braking components of landing gear based on a response surface model and a multi-island genetic algorithm. Background technique [0002] Aircraft landing gear is the main load-bearing device of the aircraft during take-off, landing, taxiing and ground parking. In the traditional aircraft design process, the design of landing gear parts adopts static strength design, supplemented by a large safety factor for strength check , but the landing gear parts designed by this design method often have larger stress margin and fatigue life margin. In the process of modern aircraft design, using CAD and CAE auxiliary tools for lightweight design has become an important research direction of aircraft landing gear design. The lightweight design of the aircraft landing gear structure helps to improve the safety and maneuverability of th...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/23
Inventor 魏小辉谢欣宏陈虎张钊王添翼
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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