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Aerodynamic load distribution method

A technology of aerodynamic load and distribution method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the complexity of the strain energy method, and achieve the effects of easy programming, high calculation efficiency, and simple implementation process

Active Publication Date: 2020-12-08
CHINA HELICOPTER RES & DEV INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the principle of minimum strain energy, the method is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Known aerodynamic loads in the element and the coordinates of the point of application of the load

[0024] The steps of the triangular element method are as follows:

[0025] (1) The three vertices of the triangular finite element element are A, B, and C respectively. The node centroid O of the triangular finite element element is calculated, and the aerodynamic load is equivalent to the centroid of the unit to obtain the force on the centroid of the unit Acting moment

[0026] (2) Evenly distributed to the three finite element nodes, the first node force on the three finite element nodes is obtained, denoted as

[0027] (3) For Will decomposed into moments perpendicular to the element plane and moments parallel to the element plane

[0028] (4) calculation The resulting second nodal force, the magnitude of the load is where r i is the distance from the node to the centroid O. load direction and Consistent, in the formula is the unit nor...

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Abstract

The invention belongs to the technical field of aircraft strength calculation, and discloses an aerodynamic load distribution method. Aerodynamic loads and load action point coordinates in units are known; Aerodynamic loads are distributed to triangular finite element units through the following steps: conducting calcualting to obtain node centroids O of the triangular finite element units, and enabling the aerodynamic loads to be equivalent to the unit centroids, so as to obtain acting force and acting torque on the unit centroids; averagely distributing the acting force to three finite element nodes to obtain first node force on the three finite element nodes, and recording the first node force; decomposing the acting torque into a moment perpendicular to a unit plane and a moment parallel to the unit plane; calculating a second node force generatedby the moment perpendicular to a unit planeon the three finite element nodes; calculating a third node force generated by the moment parallel to the unit plane on the three finite element nodes ; and respectively superposing the three node forces of the three finite element nodes to obtain respective total loads of the three nodes.

Description

technical field [0001] The invention belongs to the technical field of aircraft strength calculation, in particular to an aerodynamic load distribution method. Background technique [0002] In the process of aircraft structural strength design, it is necessary to distribute aerodynamic loads to the nodes of the structural finite element model. In the case of known pressure field, the pressure load and the equivalent action point of the load in the finite element element can be obtained by integration first. In the prior art, the load is distributed to the nodes of the finite element by weighting by distance, weighting by area or by the principle of minimum strain energy. [0003] In the process of assigning loads to nodes, weighted by distance, weighted by area or according to the principle of minimum strain energy, weighted by distance and weighted by area, when the pressure center is not located at the centroid of the element, the load on the node is the same as The poin...

Claims

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Application Information

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IPC IPC(8): G06F30/15G06F30/23G06F113/08G06F119/14
CPCG06F30/15G06F30/23G06F2113/08G06F2119/14Y02T90/00
Inventor 刘海田中强
Owner CHINA HELICOPTER RES & DEV INST