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Determination method of telescopic landing gear calibration load based on buffer compression stroke

A technology of compression stroke and determination method, applied in the field of calibration load determination of strut-type landing gear based on buffer compression stroke, can solve the problems of nonlinear influence of structural response, poor calibration accuracy, small structural strain response, etc., so as to improve the load Calibration accuracy, enriching calibration load case samples, and improving the effect of calibration load magnitude

Active Publication Date: 2017-06-06
CHINESE FLIGHT TEST ESTAB
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Problems solved by technology

In the past, the specific load situation under a certain different strokes was transformed into the same load situation under different strokes. Such a calibration load situation design has small calibration loads under large compression strokes, small structural strain responses, and nonlinear effects of structural responses. Serious and other adverse effects, resulting in poor calibration accuracy

Method used

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  • Determination method of telescopic landing gear calibration load based on buffer compression stroke
  • Determination method of telescopic landing gear calibration load based on buffer compression stroke

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Embodiment

[0020] The relationship between the calibration load and the design load is shown in the following formula. Given a certain design operating load condition (Pxlim, Fylim, Pzlim) and the corresponding known stroke L1, the rolling radius of the wheel of the strut landing gear is R0, the length of the wheel axle is L0, and the outer cylinder below the hinge point of the strut and the strut is If the length is B, it is necessary to determine the calibration load (Pxi, Fyi, Pzi) in the required calibration stroke Li (load calibration stroke classification number i=1~3 or i=1~5), and satisfy that both L1 and Li are in the calibration stroke Within 0.1S~0.9S, the hinge point Oj of the landing gear in the calibration stroke Li under the calibration load (Pxi, Fyi, Pzi) (usually the main force transmission structure of the landing gear adopts a three-point hinge statically bound to the aircraft fuselage or On the wing, there are 3 landing gear hinge points, j=1~3) the restraint loads (...

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Abstract

The invention provides a determination method of a telescopic landing gear calibration load based on a buffer compression stroke. The determination method comprises that determining the calibration compression stroke to select an appropriate calibration stroke range within a buffer compression stroke design range; grading and fixing the compression stroke; orthogonally designing calibration conditions; selecting calibration load conditions: selecting a maximum unidirectional load and a composite load in the designed operation load conditions and the corresponding stroke as an initial source for determining the calibration load conditions; equivalently determining the calibration load: after reducing the primary designed operation load conditions in a specific proportion by utilizing an equivalence principle, the primary designed operation load is mapped to different sizes of the calibration loads of every grading stroke. The determination method of a telescopic landing gear calibration load is used to design the conditions of the telescopic landing gear calibration load based on the buffer compression stroke, and is applicable to a rocker arm type landing gear with the buffer, and has wide applicability and practicability.

Description

technical field [0001] The invention is patented in the field of aircraft flight test, and relates to a method for determining the calibration load of a strut landing gear based on a buffer compression stroke. Background technique [0002] The external load measurement of aircraft landing gear is usually carried out by strain electrical measurement method, which mainly includes key steps such as strain gauge modification, load ground calibration and flight measurement. Among them, the ground calibration of the load is very important, and how to simulate the load of the aircraft is the top priority. Due to the significant characteristics of the landing gear such as single force transmission path, multiple mechanism links, high structural rigidity, complex multi-component bearing coupling, and serious nonlinear changes of the load with the stroke of the buffer, the change of the stroke of the buffer has a significant impact on the load of the landing gear. It brings great dif...

Claims

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Application Information

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IPC IPC(8): B64F5/60
Inventor 蒋启登原正庭郭正旺王海平张多源
Owner CHINESE FLIGHT TEST ESTAB
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