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Strain-based three-dimensional configuration determination method for large flexible beam structures

A determination method and three-dimensional space technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, instruments, etc., to achieve the effect of improving accuracy, improving poor measurement accuracy, and wide application scenarios

Active Publication Date: 2022-05-27
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not need to introduce constraints on the laying angle of the strain sensor, thus effectively overcoming the problems of poor measurement accuracy of the large deformation of the large flexible beam structure and difficulty in engineering practice in the existing methods

Method used

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  • Strain-based three-dimensional configuration determination method for large flexible beam structures
  • Strain-based three-dimensional configuration determination method for large flexible beam structures
  • Strain-based three-dimensional configuration determination method for large flexible beam structures

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Experimental program
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Embodiment 1

[0054] Taking the number of sensor layout sections N=5 as an example, such as figure 1 As shown, the flexible beam structure 1 to be tested is divided into N=5 sections, which include the beam center reference line 2, the section 3 considering shear deformation, the sensor arrangement section along the beam center reference line station 5, the beam structure Unit Node 6. The arc length coordinate along the length direction of the beam center reference line 2 is marked as s; the arc length coordinate of the nth structural element node 6 is s' n-1 , shown as s' 2 ; the origin O of the spatial reference system E, the basis vector E 1 =[1 0 0] T , E 2 =[0 1 0] T , E 3 =[0 0 1] T ;The point P on the beam center reference line 2 coincides with the position 5 of the sensor layout section along the beam center reference line, and the arc length coordinate is s n , shown in the figure as s 3 ; The spatial position vector of point P in the reference coordinate system E is R(s);...

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Abstract

The invention provides a method for determining the three-dimensional space configuration of a large flexible beam structure based on strain. The method obtains the strain information of the preset position on the surface of the structure through a strain sensor, and then calculates the generalized strain of the reference line of the center of the beam, and then calculates the generalized strain of the reference line according to the geometric accuracy The precise generalized strain-configuration relationship in beam theory restores the configuration of the beam center reference line, and finally introduces the relative positional relationship between any point in the structure and the beam reference line to obtain the three-dimensional spatial configuration of any position of the structure to be measured. The method of the present invention does not need to introduce constraints on the laying angle of the strain sensor, thereby effectively overcoming the problems of poor measurement accuracy of large deformation of a large flexible beam structure and difficult application in engineering practice in the existing method.

Description

technical field [0001] The invention relates to the technical field of flexible beam structure design, in particular to a method for determining the three-dimensional spatial configuration of a large flexible beam structure based on strain. Background technique [0002] Large aspect ratio wings made of lightweight composite materials are widely used in modern aircraft due to their light structural mass and large lift-to-drag ratio. However, such wings are more flexible and prone to large deformation when subjected to aerodynamic loads, which affects the flight performance and flight safety of the aircraft. Therefore, how to accurately measure the large three-dimensional deformation of such wings has become a key technology that must be broken through in the design, testing and structural health monitoring of aircraft. [0003] According to the type of sensor, the past spatial configuration sensing methods can be roughly divided into two categories: non-contact measurement a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16G01B11/16G06F17/16
CPCG01B7/16G01B11/16G01B11/165G06F17/16
Inventor 孟杨谢长川安朝许秋怡
Owner BEIHANG UNIV