CN-121980798-A - Loading method and device for complex curved surface gradual pressure static test load, computer equipment and medium

CN121980798ACN 121980798 ACN121980798 ACN 121980798ACN-121980798-A

Abstract

The embodiment of the invention provides a loading method, a device, computer equipment and a medium for a complex curved surface gradient pressure static test load, wherein the method comprises the following steps of obtaining geometric model data and gradient pressure distribution data of a complex curved surface to be tested, dividing the complex curved surface into a plurality of loading partitions, generating partition definition data, determining loading point number data for each loading partition, carrying out finite element analysis based on the plurality of data, calculating and outputting partition resultant force data, calculating coordinates of a pressure center based on the gradient pressure distribution data and the geometric model data corresponding to the loading partition, taking the coordinates of the pressure center as theoretical action point data of the loading partition, carrying out secondary static equivalent processing, and generating executable loading scheme data of the loading partition and integrating the executable loading scheme data. The gradual pressure intensity of each partition is equivalent to a resultant force through finite element calculation, so that the accurate load size and direction are obtained, and the loading error is reduced.

Inventors

ZHANG XIZHENG
GUO JUNHAO
LUO FEI
WANG XIN
SHAO YUHANG

Assignees

中国飞机强度研究所

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (10)

1. The loading method of the complex curved surface gradual pressure static test load is characterized by comprising the following steps of: obtaining geometric model data of a complex curved surface to be tested and gradual pressure distribution data corresponding to the geometric model data; Dividing the complex curved surface into a plurality of loading partitions based on the geometric model data and physical constraints of test loading, generating partition definition data, and determining loading point number data for each loading partition; Based on the geometric model data, the partition definition data, the gradual pressure distribution data and preset boundary condition data, finite element analysis is carried out, and partition resultant force data of each loading partition are calculated and output, wherein the partition resultant force data comprises resultant force vectors and resultant moments; For each loading partition, calculating the coordinates of the pressure center of the loading partition based on the gradual pressure distribution data and the geometric model data corresponding to the loading partition, and taking the coordinates of the pressure center as theoretical action point data of the loading partition; performing secondary static force equivalent processing on each loading partition based on the corresponding partition resultant force data and the theoretical action point position data, and generating executable loading scheme data of the loading partition, wherein the executable loading scheme data comprises space positions of a plurality of physical loading points and load vectors distributed for the physical loading points; Integrating the executable loading scheme data of all the loading partitions.
2. The method for loading a complex curved surface gradient pressure static test load according to claim 1, wherein determining load point number data for each of the load partitions comprises: Calculating to obtain the number of reference loading points according to the partition area in the partition definition data and a preset loading point density reference value; acquiring curved surface curvature information corresponding to each loading partition in the geometric model data; Correcting the number of the reference loading points according to the curvature information of the curved surface, and adjusting the number of the loading points of the loading partition with the curvature higher than a preset threshold value to be larger than the number of the reference loading points.
3. The loading method of complex curved surface gradient pressure static test load according to claim 1, wherein based on the geometric model data, the partition definition data, the gradient pressure distribution data and preset boundary condition data, finite element analysis is performed, and partition resultant force data of each loading partition is calculated and output, including: grid discretization is carried out on the geometric model of the corresponding region according to the partition definition data, and a partition grid model is generated; Mapping the gradual pressure distribution data to each surface unit of the partitioned grid model, and calculating to obtain node force data of each surface unit; and in the range of the partition definition data, vector synthesis and moment synthesis are carried out on all the node force data, and the resultant force vector and the resultant moment are obtained through calculation.
4. The loading method of complex curved surface gradient pressure static test load according to claim 1, wherein calculating coordinates of a pressure center of the loading partition based on the gradient pressure distribution data and the geometric model data corresponding to the loading partition comprises: acquiring curved surface geometric information corresponding to the loading partition according to the geometric model data; Based on the curved surface geometric information and the gradual change pressure distribution data, dispersing the loading partition into a plurality of loading microelements, and determining the microelement area, the microelement center position and the microelement normal direction of each loading microelement; According to the gradual change pressure distribution data, calculating a micro-element load vector on each load micro-element; And calculating to obtain the coordinates of the pressure center by taking the infinitesimal center position as the pressure center according to infinitesimal load vectors on all the load infinitesimal and infinitesimal center positions corresponding to the infinitesimal load vectors.
5. The loading method of complex curved surface gradient pressure static test load according to claim 1, wherein the generating executable loading scheme data of the loading partition based on the corresponding partition resultant force data and the theoretical action point position data by performing a secondary static equivalent process comprises: acquiring the resultant force data of the partition of the loading partition to be processed, the theoretical action point data and the feasibility constraint condition of the loading lever system; Establishing a static equivalent optimization model, wherein the static equivalent optimization model is used for optimizing and decomposing the partition resultant force data and the theoretical action point data into a plurality of physically realizable loading point loads under the condition of meeting the feasibility constraint; and solving the static equivalent optimization model to obtain a group of M load vectors which meet all constraints and optimize the objective function and candidate loading point positions corresponding to the load vectors, binding the load vectors with the candidate loading point positions, and outputting the load vectors as the executable loading scheme data.
6. The loading method of the complex curved surface gradient pressure static test load according to claim 5, wherein the establishing of the static equivalent optimization model comprises: Setting a design variable, wherein the design variable is a load vector acting on M candidate loading points in a current loading partition, and M is more than or equal to 2; taking the vector sum of the M load vectors as a core equation constraint, wherein the vector sum is equal to a resultant force vector in the partition resultant force data, and the resultant moment of the M load vectors to points indicated by the theoretical action point position data is equal to the resultant moment in the partition resultant force data; taking the size and direction of each load vector to meet the feasibility constraint condition as an inequality constraint; Defining an objective function, wherein the objective function is used for optimizing at least one index of load distribution performance indexes, system energy consumption indexes and direction consistency indexes; and constructing a static equivalent optimization model based on the core equation constraint, the inequality constraint and the objective function.
7. The method for loading a complex curved surface gradient pressure static test load according to claim 5, further comprising: If the static equivalent optimization model is failed to solve or the obtained executable loading scheme data does not meet the engineering error requirement, the number M of the candidate loading points or the spatial positions of the candidate loading points are adjusted, and the static equivalent optimization model is re-established and solved until the executable loading scheme data meeting the requirement is obtained.
8. The utility model provides a loading device of complex curved surface gradual change pressure static test load which characterized in that includes: The parameter acquisition module is used for acquiring geometric model data of the complex curved surface to be tested and gradual change pressure distribution data corresponding to the geometric model data; The curved surface partition module is used for dividing the complex curved surface into a plurality of loading partitions based on the geometric model data and the physical constraint of test loading, generating partition definition data and determining loading point number data for each loading partition; The finite element calculation and load extraction module is used for carrying out finite element analysis based on the geometric model data, the partition definition data, the gradual change pressure distribution data and preset boundary condition data, and calculating and outputting partition resultant force data of each loading partition, wherein the partition resultant force data comprises a resultant force vector and a resultant moment; The action point analysis module is used for calculating the coordinates of the pressure center of the loading partition based on the gradual pressure distribution data and the geometric model data corresponding to the loading partition, and taking the coordinates of the pressure center as theoretical action point data of the loading partition; The resultant force secondary load processing module is used for carrying out secondary static force equivalent processing on the basis of the corresponding partition resultant force data and the theoretical action point position data for each loading partition, and generating executable loading scheme data of the loading partition, wherein the executable loading scheme data comprises space positions of a plurality of physical loading points and load vectors distributed for the physical loading points; And the data integration module is used for integrating the executable loading scheme data of all the loading partitions.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of loading complex curved surface gradient hydrostatic test loads according to any one of claims 1 to 7 when the computer program is executed by the processor.
10. A computer readable storage medium, wherein the computer readable storage medium stores a computer program for executing the loading method of the complex curved graded hydrostatic test load of any one of claims 1 to 7.

Description

Loading method and device for complex curved surface gradual pressure static test load, computer equipment and medium Technical Field The invention relates to the technical field of airplane load, in particular to a loading method, a loading device, computer equipment and a medium for a complex curved surface gradual pressure static test load. Background In the static test of the structural strength of an aircraft, the limiting load of a part of the structure is given in the form of gradual pressure change along the course. In the structural strength test, the loading point is usually formed by sticking an adhesive tape on the surface of the test piece, and loading the test piece through a combined lever. For the pressed curved surface, a common loading mode is to paste a pulling and pressing pad or a wood block on the surface of the test piece, and load the test piece through a combined lever. However, the checking structure is a complex curved surface, the pressure intensity of each point is the normal direction of the curved surface, and the load calculation is very complex. Therefore, a load handling method is needed to handle the gradual load as a node load, and then to design a loading lever system so that the loading condition of the aircraft structure can reach the original assessment requirement as much as possible. At present, a conventional load processing mode for the gradual change pressure of the curved surface is to divide the curved surface into a plurality of areas, roughly calculate the average value of the gradual change pressure in each area to be equivalent to uniform distribution pressure, obtain the total load size by multiplying the uniform distribution pressure by the area, estimate a load direction and an action point, and then perform the next lever design. However, this calculation is very difficult for complex curved surfaces, and uncertainty of the load direction and the action point leads to great design errors of the loading system in the next step. Disclosure of Invention In view of the above, the embodiment of the invention provides a loading method of a complex curved surface gradient pressure static test load, so as to solve the technical problem of complex load calculation when an aircraft structure is a complex curved surface in the prior art. The method comprises the following steps: obtaining geometric model data of a complex curved surface to be tested and gradual pressure distribution data corresponding to the geometric model data; Dividing the complex curved surface into a plurality of loading partitions based on the geometric model data and physical constraints of test loading, generating partition definition data, and determining loading point number data for each loading partition; Based on the geometric model data, the partition definition data, the gradual pressure distribution data and preset boundary condition data, finite element analysis is carried out, and partition resultant force data of each loading partition are calculated and output, wherein the partition resultant force data comprises resultant force vectors and resultant moments; For each loading partition, calculating the coordinates of the pressure center of the loading partition based on the gradual pressure distribution data and the geometric model data corresponding to the loading partition, and taking the coordinates of the pressure center as theoretical action point data of the loading partition; performing secondary static force equivalent processing on each loading partition based on the corresponding partition resultant force data and the theoretical action point position data, and generating executable loading scheme data of the loading partition, wherein the executable loading scheme data comprises space positions of a plurality of physical loading points and load vectors distributed for the physical loading points; Integrating the executable loading scheme data of all the loading partitions. The embodiment of the invention also provides a loading device for the complex curved surface gradual pressure static test load, which aims to solve the technical problem of complex load calculation when the aircraft structure is a complex curved surface in the prior art. The device comprises: The parameter acquisition module is used for acquiring geometric model data of the complex curved surface to be tested and gradual change pressure distribution data corresponding to the geometric model data; The curved surface partition module is used for dividing the complex curved surface into a plurality of loading partitions based on the geometric model data and the physical constraint of test loading, generating partition definition data and determining loading point number data for each loading partition; The finite element calculation and load extraction module is used for carrying out finite element analysis based on the geometric model data, the partition definition data, the gradual change pressure