CN-115563721-B - Structural health monitoring method and device, electronic equipment and storage medium

CN115563721BCN 115563721 BCN115563721 BCN 115563721BCN-115563721-B

Abstract

The embodiment of the invention discloses a structural health monitoring method, a structural health monitoring device, electronic equipment and a storage medium. The method comprises the steps of determining a first parameter value of a healthy working condition corresponding to a structural unit in a target structure, determining a second parameter value of a damaged working condition corresponding to the structural unit, determining damage indexes of the structural unit based on the first parameter value and the second parameter value, generating a damage index histogram corresponding to the target structure based on damage indexes of all the structural units, and determining the structural unit with damage in the target structure based on the damage index histogram. The technical scheme provided by the embodiment of the invention can realize rapid, reliable and high-sensitivity capturing of instantaneous dynamic impact response in the running process of the aircraft, so that a plurality of potential defects and damages of the aircraft structure can be detected with high precision and high sensitivity.

Inventors

QIU JU
XU PENG
LUAN YINGWEI
WANG SHIJIE
LI ZHENYOU
WANG MIN
GAO LONGFEI
TANG JIALI
CHEN LUSONG

Assignees

上海飞机制造有限公司

Dates

Publication Date: 20260505
Application Date: 20210702

Claims (8)

1. A method of structural health monitoring comprising: Determining a first parameter value of a healthy working condition corresponding to a structural unit in a target structure, and determining a second parameter value of a damaged working condition corresponding to the structural unit; Determining a damage index of the structural unit based on the first parameter value and the second parameter value; generating a damage index histogram corresponding to the target structure based on the damage index of each structural unit; determining structural units in which damage exists in the target structure based on the damage index histogram; wherein the determining the damage index of the structural unit based on the first parameter value and the second parameter value comprises: determining the damage index of the structural unit based on the following formula: ; Wherein, the To be the damage index of the kth structural unit in the target structure, A first parameter value for a kth building block in the target structure; A second parameter value for a kth building block in the target structure; Wherein, the ; Wherein i is the ith order mode, n is the total mode number of the target structure under the healthy working condition, Representing the modal weight coefficient of the ith order modal of the kth structural unit in the target structure under the healthy working condition, which is the element of the kth row and the ith column in the modal weight coefficient vector of the target structure under the healthy working condition, The comprehensive strain value of the ith order mode of the kth structural unit in the target structure under the healthy working condition is obtained; Wherein, the ; Wherein l is the total modal number of the target structure under the damage working condition, Representing the modal weight coefficient of the ith order modal of the kth structural unit in the target structure under the damage working condition, which is the element of the kth row and the ith column in the modal weight coefficient vector of the target structure under the damage working condition, The method comprises the steps of obtaining a comprehensive strain value of an ith order mode of a kth structural unit in the target structure under a damage working condition; the comprehensive strain value of the ith order mode of the kth structural unit in the target structure under the target working condition is determined based on the following formula: ; Wherein, the For the comprehensive strain value of the ith order mode of the kth structural unit in the target structure under the target working condition, For the ith component of the modal impact vector of the target structure at the target operating condition, For the damping of the ith order mode of the target structure under the target working condition, For the natural frequency of the ith order mode of the target structure under the target working condition, Representing the modal strain of the ith order mode of a kth structural unit in the target structure under a target working condition by using elements of the kth row and the ith column in the modal displacement-strain conversion vector; The target conditions include healthy conditions and damaging conditions.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises, The modal displacement-strain conversion vector is determined based on the following formula: ; Wherein, the For the modal displacement-strain conversion vector of the target structure at the target operating condition, For displacement-strain conversion vectors of the target structure at a target operating condition, The modal vector of the target structure under the target working condition is obtained; Wherein, the ; Wherein the said For the strain vector of the target structure under the target working condition, the The strain value in the strain vector is obtained by measuring a strain sensor or a strain patch, wherein x is the maximum number of lines of y; Wherein the said The said For the displacement of the b node in the target structure, z is the maximum number of rows of q, the A generalized inverse vector corresponding to the displacement vector of the target structure under the target working condition is obtained; The said And obtaining the target structure based on a ground vibration test corresponding to the target structure under the target working condition.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises, The modal weight coefficient vector of the target structure under the target working condition is determined based on the following formula: ; Wherein, the For the modal weight coefficient vector of the target structure under the target working condition, For the weight coefficient vector of the target structure under the target working condition, A transposed vector of a modal vector of the target structure under a target working condition; Wherein, the ; Wherein the said Is said The weight coefficient of the r row and the s column in the row (u) is the maximum row number, and v is the maximum column number; Wherein the said Converting vectors for displacement-strain of the target structure under healthy conditions The displacement-strain conversion coefficient of the r th row and the s th column, wherein, 。
4. The method of claim 1, wherein determining structural units in which lesions are present in the target structure based on the lesion index histogram comprises: In the damage index histogram, if the damage index of the target structural unit is higher than a preset damage index, determining that the target structural unit is damaged.
5. The method of claim 1, further comprising, prior to determining the first parameter value for the healthy condition corresponding to the structural element in the target structure and determining the second parameter value for the damaged condition corresponding to the structural element: Constructing a healthy finite element model corresponding to the target structure under a healthy working condition, and constructing a damaged finite element model corresponding to the target structure under a damaged working condition; Correspondingly, determining a first parameter value of a healthy condition corresponding to a structural unit in a target structure, and determining a second parameter value of a damaged condition corresponding to the structural unit, includes: And determining a first parameter value of a healthy working condition corresponding to the structural unit in the target structure based on the healthy finite element model, and determining a second parameter value of a damaged working condition corresponding to the structural unit based on the damaged finite element model.
6. A structural health monitoring device employing the structural health monitoring method of claim 1, comprising: The parameter value determining module is used for determining a first parameter value of a healthy working condition corresponding to a structural unit in a target structure and determining a second parameter value of a damaged working condition corresponding to the structural unit; a damage index determination module for determining a damage index of the structural unit based on the first parameter value and the second parameter value; the damage index histogram generation module is used for generating a damage index histogram corresponding to the target structure based on the damage index of each structural unit; and the damage structural unit determining module is used for determining structural units with damage in the target structure based on the damage index histogram.
7. An electronic device, comprising: One or more processors; storage means for storing one or more programs, The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of claims 1-5.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any of claims 1-5.

Description

Structural health monitoring method and device, electronic equipment and storage medium Technical Field The embodiment of the invention relates to the technical field of structural damage diagnosis, in particular to a structural health monitoring method, a structural health monitoring device, electronic equipment and a storage medium. Background The on-line monitoring of the aircraft structural health is a damage diagnosis method based on dynamic response test, and the method comprises signal extraction and acquisition and signal processing, and has the advantages of being relatively simple, low in cost, capable of realizing real-time monitoring of the structure and the like. The basic principle is that the change of structural parameters is judged by utilizing the actually measured data of structural dynamic response and the system parameter identification technology, so as to judge whether the structure has damage or not and the position and degree of the damage. Based on structural damage monitoring, the method comprises five layers, namely a first step of judging whether damage exists or not, a second step of judging the damage position, a third step of judging the damage degree and type, a fourth step of estimating the residual life of the structure, and a fifth step of estimating the integrity of the whole structure. In the related art, the structural damage health monitoring method is used for detecting the aircraft structure by vortex, ultrasonic, X-ray and other instruments when the aircraft is stopped, and some structures can be detected after being disassembled. Or the related technology monitors the structural health in the running state of the aircraft, and can only monitor one damage position. Disclosure of Invention The embodiment of the invention provides a structural health monitoring method, a structural health monitoring device, electronic equipment and a storage medium, which can rapidly, reliably and sensitively capture instantaneous dynamic impact response in the running process of an aircraft, so that a plurality of potential defects and damages of the aircraft structure can be detected with high precision and high sensitivity. In a first aspect, an embodiment of the present invention provides a method for monitoring structural health, including determining a first parameter value of a health condition corresponding to a structural unit in a target structure, and determining a second parameter value of a damage condition corresponding to the structural unit; Determining a damage index of the structural unit based on the first parameter value and the second parameter value; generating a damage index histogram corresponding to the target structure based on the damage index of each structural unit; Determining structural units in which damage exists in the target structure based on the damage index histogram. In a second aspect, the embodiment of the invention also provides a structural health monitoring device, which comprises a parameter value determining module, a structural unit monitoring module and a structural health monitoring module, wherein the parameter value determining module is used for determining a first parameter value of a health working condition corresponding to the structural unit in a target structure and determining a second parameter value of a damage working condition corresponding to the structural unit; a damage index determination module for determining a damage index of the structural unit based on the first parameter value and the second parameter value; the damage index histogram generation module is used for generating a damage index histogram corresponding to the target structure based on the damage index of each structural unit; and the damage structural unit determining module is used for determining structural units with damage in the target structure based on the damage index histogram. In a third aspect, an embodiment of the present invention further provides an electronic device, including: One or more processors; storage means for storing one or more programs, The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the structural health monitoring method according to any of the embodiments of the present invention. In a fourth aspect, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a structural health monitoring method according to any of the embodiments of the present invention. The technical scheme provided by the embodiment of the invention comprises the steps of determining a first parameter value of a healthy working condition corresponding to a structural unit in a target structure, determining a second parameter value of a damaged working condition corresponding to the structural unit, determining damage indexes of the structural unit based on the first p