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A method of inverse load distribution based on structural strain distribution

A strain distribution and load distribution technology, applied in sustainable transportation, design optimization/simulation, geometric CAD, etc., to achieve the effect of simplifying the test scale, large-scale engineering application value, and ensuring prediction accuracy

Active Publication Date: 2022-07-12
CHENGDU AIRCRAFT DESIGN INST OF AVIATION IND CORP OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a Euclidean space method under the assumption of linear elasticity to solve the problem of inverting the load distribution from the strain distribution

Method used

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  • A method of inverse load distribution based on structural strain distribution
  • A method of inverse load distribution based on structural strain distribution
  • A method of inverse load distribution based on structural strain distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] Select the load distribution data and strain distribution data of the left wing of the whole aircraft fatigue test of a certain type of aircraft. The specific implementation method is as follows:

[0045] Step 1: Build the Design Load Case Library

[0046] A total of 189 independent load conditions in the fatigue test of the whole machine were taken as the design load conditions.

[0047] Step 2: Construct the strain vector for each case in Step 1

[0048] From a large number of strain gauges arranged on the wing, 150 are selected as the strain distribution, and the dimension of the strain vector is k=150.

[0049] Step 3: Construct load vectors for each case in Step 1

[0050] There are a total of 24 loading actuators on the airfoil surface, so the dimension of the load vector is n=24.

[0051] Step 4: Screen out the reference case for the strain space in step 2 and the reference case for the load space in step 3

[0052] use figure 2 In the screening method show...

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Abstract

The invention discloses a method for inferring load distribution based on structural strain distribution. , construct the load vector of each working condition in the working condition library, and create the load space; adopt the Schmidt orthogonalization method to screen out the reference working condition of the strain space and the reference working condition of the load space respectively from the design load conditions; Determine whether the strain reference condition includes the load reference condition. If not, expand the structural strain distribution and construct a new strain space. Otherwise, according to the strain vector and load vector under the strain reference condition, through matrix operations, for any working condition The load distribution corresponding to the strain distribution is inversely calculated. The present invention can select reference working conditions from a large number of design load working conditions, solves the problem of inversely pushing load distribution based on structural strain distribution, and provides guidance for the selection of ground test working conditions.

Description

technical field [0001] The invention belongs to the technical field of aircraft structural load measurement, in particular to a method for inversely pushing load distribution based on structural strain distribution. Background technique [0002] The traditional method for actual measurement of aircraft structural loads is to arrange a small number of strain bridges on the main force transmission path of the structure, and to construct a "strain-load" equation through a ground load calibration test to measure the overall load of aircraft structural components, such as wing root or Shear, bending, and torque for a section. This method is not ideal for the prediction of torque in the overall load, and the structural load distribution cannot be obtained. SUMMARY OF THE INVENTION [0003] In view of the above-mentioned situation in the prior art, the purpose of the present invention is to provide a method for inverting the load distribution based on the structural strain distr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/23
CPCY02T90/00
Inventor 兑红娜刘栋梁张志贤王勇军董江刘鑫
Owner CHENGDU AIRCRAFT DESIGN INST OF AVIATION IND CORP OF CHINA