A method for determining loading node loads in component static testing

Abstract

The present application belongs to the technical field of determining the load of loading nodes in a static test of a component, and specifically relates to a method for determining the load of loading nodes in a static test of a component, comprising: determining the loading nodes in the static test of the component; determining the initial distribution of the loading load of each loading node; constructing a finite element model of the static test of the component, performing finite element analysis, obtaining the sensitivity coefficient of the assessment target to each loading node, and then constructing a sensitivity coefficient matrix; constructing a finite element model of a theoretical state of the component, performing finite element analysis, obtaining the assessment target response error under the static test and theoretical state finite element model of the component, and then constructing a response error matrix; using the sensitivity coefficient matrix and the response error matrix, calculating the increment of the loading load of each loading node, updating the loading load of each loading node, until the assessment target response error under the static test and theoretical state finite element model of the component meets the requirements, and obtaining the loading load of each loading node.

Description

Technical Field

[0001] The present application belongs to the technical field of component static test loading node load determination, and specifically relates to a component static test loading node load determination method. Background Art

[0002] There are a large number of structural components in an aircraft, and static testing of the components is an important means of evaluating component performance.

[0003] To conduct static tests on components, it is necessary to accurately convert the theoretical loads borne by the components into test loading node loads, so as to apply loads to the components during the static tests. Currently, the determination of loading node loads for static tests of components often requires a large number of repeated iterations and calculations, which is inefficient and makes it difficult to ensure the control requirements of the target response error of the structural assessment.

[0004] This application is proposed in view of the above-mentioned technical defects.

[0005] It should be noted that the disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0006] The purpose of this application is to provide a method for determining the load of a loading node in a static test of a component, so as to overcome or alleviate at least one of the technical deficiencies of the known ones.

[0007] The technical solution of this application is:

[0008] A method for determining a loading node load in a component static test, comprising:

[0009] Determine the loading nodes of component static test;

[0010] Determine the initial distribution of loading loads at each loading node;

[0011] Construct a finite element model for component static testing, perform finite element analysis, obtain the sensitivity coefficients of the assessment target to each loading node, and then construct a sensitivity coefficient matrix;

[0012] Construct a finite element model of the theoretical state of the component, perform finite element analysis, obtain the target response error under the static test and theoretical state finite element model of the component, and then construct a response error matrix;

[0013] The sensitivity coefficient matrix and response error matrix are used to calculate the increment of the loading load of each loading node, and the loading load of each loading node is updated until the target response error under the static test of the component and the theoretical state finite element model meets the requirements, and the loading load of each loading node is obtained.

[0014] According to at least one embodiment of the present application, in the above-mentioned method for determining the load of the component static test loading node, the determination of the component static test loading node is specifically:

[0015] Determine the loading nodes of the component static test based on the component's structural form and theoretical load distribution.

[0016] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, the initial distribution of the loading load of each loading node is determined as follows:

[0017] According to the principle of theoretical total load and total moment unchanged and control section error control, the initial distribution scheme of loading load for each loading node is determined, and then the loading load for each loading node is calculated.

[0018] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, the assessment targets include the joint support reaction force, node displacement, unit strain and stress thereof on the component.

[0019] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, the calculation of the increment of the loading load of each loading node using the sensitivity coefficient matrix and the response error matrix is ​​specifically as follows:

[0020] dp=S -1 *F;

[0021] in,

[0022] dp is the incremental matrix of the load applied to each loading node;

[0023] S is the sensitivity coefficient matrix;

[0024] F is the response error matrix.

[0025] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, the calculation of the increment of the loading load of each loading node using the sensitivity coefficient matrix and the response error matrix is ​​specifically as follows:

[0026] Calculate the minimum value of the quadratic programming objective function dp′*S′*S*dp-2*(S′*F)′*dp and obtain the corresponding dp;

[0027] in,

[0028] dp is the incremental matrix of the load applied to each loading node;

[0029] S is the sensitivity coefficient matrix;

[0030] F is the response error matrix.

[0031] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, the calculation of the increment of the loading load of each loading node using the sensitivity coefficient matrix and the response error matrix is ​​specifically as follows:

[0032] The equality constraint is performed with the theoretical total load moment, and the inequality constraint is performed with the control section error. The upper and lower limits of the load at each loading point are restricted. The minimum value of the nonlinear programming objective function (S*dp-F)′*(S*dp-F) is calculated to obtain the corresponding dp.

[0033] in,

[0034] dp is the incremental matrix of the load applied to each loading node;

[0035] S is the sensitivity coefficient matrix;

[0036] F is the response error matrix.

[0037] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, when the assessment target response error cannot meet the requirements under the component static test and the theoretical state finite element model, an assessment target response error weighting matrix is ​​set to adjust the assessment target response error.

[0038] According to at least one embodiment of the present application, in the above-mentioned method for determining the loading node load of a component static test, when the assessment target response error meets the requirements under the component static test and the theoretical state finite element model, but there is a situation where the local strain in the non-assessment area is too large, the local strain in the non-assessment area is added to the assessment target. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flow chart of a method for determining the loading node load of a component static test provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] To make the technical solution and its advantages of the present application clearer, the technical solution of the present application will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present application and are only used to explain the present application, not to limit the present application. It should be noted that, for ease of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0041] In addition, unless otherwise defined, the technical or scientific terms used in the description of this application should have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The words "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer" used in the description of this application are only used to indicate relative directions or positional relationships, and do not imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. Therefore, they should not be understood as limitations on this application. The words "first," "second," "third," and similar terms used in the description of this application are used only for descriptive purposes to distinguish different components and should not be understood to indicate or imply relative importance. The words "one," "an," or "the" used in the description of this application should not be understood as absolute limitations on quantity, but should be understood as meaning the presence of at least one. The words "include" or "comprises" used in the description of this application mean that the element or object listed before the word includes the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0042] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "install", "connect", "connect" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0043] The following is combined with Figure 1 This application is described in further detail.

[0044] A method for determining a loading node load in a component static test, comprising:

[0045] Determine the loading node of the component static test, that is, the location of the tape or tension and compression pad when conducting the component static test, and the actuator can be used to load the component at this location;

[0046] Determine the initial distribution of loading loads at each loading node;

[0047] Construct a finite element model for component static testing, perform finite element analysis, obtain the sensitivity coefficients of the assessment target to each loading node, and then construct a sensitivity coefficient matrix;

[0048] Construct a finite element model of the theoretical state of the component, perform finite element analysis, obtain the target response error under the static test and theoretical state finite element model of the component, and then construct a response error matrix;

[0049] The sensitivity coefficient matrix and response error matrix are used to calculate the increment of the loading load of each loading node, and the loading load of each loading node is updated until the target response error under the static test of the component and the theoretical state finite element model meets the requirements, and the loading load of each loading node is obtained.

[0050] As for the method for determining the load at the loading node of a component static test disclosed in the above embodiment, those skilled in the art will understand that its design is to construct a finite element model of the component static test and perform finite element analysis to obtain the sensitivity coefficient of the assessment target to each loading node, and then construct a sensitivity coefficient matrix; and to construct a finite element model of the component theoretical state and perform finite element analysis to obtain the assessment target response error under the component static test and theoretical state finite element model, and then construct a response error matrix. The sensitivity coefficient matrix and the response error matrix are used to calculate the increment of the loading load at each loading node, and the loading load at each loading node is updated until the assessment target response error under the component static test and theoretical state finite element model meets the requirements, thereby obtaining the loading load at each loading node. That is, the loading load at each loading node is updated based on the sensitivity and response error to obtain the loading load at each loading node. The calculation converges quickly, and the loading load at each loading node can be obtained efficiently. On the basis of ensuring the control requirements of the total load and moment and the control section error, and the consistency of the structural assessment target response with the theoretical state, the reliability of the static test results is thereby ensured.

[0051] In some optional embodiments, in the above-mentioned method for determining the load of a component static test loading node, the determining of the component static test loading node is specifically:

[0052] Determine the loading nodes of the component static test based on the component's structural form and theoretical load distribution.

[0053] In some optional embodiments, in the above-mentioned method for determining the initial distribution of loads at loading nodes in a component static test, the determination of the loading loads at each loading node is specifically as follows:

[0054] According to the principle of theoretical total load and total moment unchanged and control section error control, the initial distribution scheme of loading load for each loading node is determined, and then the loading load for each loading node is calculated.

[0055] In some optional embodiments, in the above-mentioned method for determining the loading node load of a component static test, the assessment targets include the joint support reaction force, node displacement, unit strain and stress thereof on the component.

[0056] In some optional embodiments, in the above-mentioned method for determining the loading node load of a component static test, the increment of the loading load of each loading node is calculated by using the sensitivity coefficient matrix and the response error matrix, specifically:

[0057] dp=S -1 *F;

[0058] in,

[0059] dp is the incremental matrix of the load applied to each loading node;

[0060] S is the sensitivity coefficient matrix;

[0061] F is the response error matrix.

[0062] In some optional embodiments, in the above-mentioned method for determining the loading node load of a component static test, the increment of the loading load of each loading node is calculated by using the sensitivity coefficient matrix and the response error matrix, specifically:

[0063] Calculate the minimum value of the quadratic programming objective function dp′*S′*S*dp-2*(S′*F)′*dp and obtain the corresponding dp, which can be solved using the Matlab quadratic programming toolbox;

[0064] in,

[0065] dp is the incremental matrix of the load applied to each loading node;

[0066] S is the sensitivity coefficient matrix;

[0067] F is the response error matrix.

[0068] In some optional embodiments, in the above-mentioned method for determining the loading node load of a component static test, the increment of the loading load of each loading node is calculated by using the sensitivity coefficient matrix and the response error matrix, specifically:

[0069] Theoretical total load and total moment are used for equality constraints, and section error is used for inequality constraints, including inequality constraints on section bending moment, shear force, and torque errors, as well as upper and lower limits on the loads at each loading point. The minimum value of the nonlinear programming objective function (S*dp-F)′*(S*dp-F) is calculated to obtain the corresponding dp, which can be solved using the Matlab nonlinear programming toolbox.

[0070] in,

[0071] dp is the incremental matrix of the load applied to each loading node;

[0072] S is the sensitivity coefficient matrix;

[0073] F is the response error matrix.

[0074] In some optional embodiments, in the above-mentioned method for determining the loading node load of the component static test, when the assessment target response error cannot meet the requirements under the component static test and the theoretical state finite element model, the assessment target response error weighting matrix is ​​set or adjusted to converge the main assessment target, and the error requirements of the secondary assessment target can be appropriately relaxed to a certain extent.

[0075] In some optional embodiments, in the above-mentioned method for determining the load of loading nodes in the static test of components, when the assessment target response error meets the requirements under the static test of components and the theoretical state finite element model, but there is a situation where the local strain in the non-assessment area is too large, the local strain in the non-assessment area is added to the assessment target. Under this assessment target, the sensitivity coefficient matrix and the response error matrix are used to calculate the increment of the loading load of each loading node, and the loading load of each loading node is updated until the assessment target response error meets the requirements under the static test of components and the theoretical state finite element model, and the loading load of each loading node is obtained. This can avoid the situation where the local strain is too large during the static test of components and ensure the safety of the test.

[0076] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in detail.

[0077] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the scope of protection of the present application.

Claims

1. A method for determining the loading node load in a component static test, characterized in that: include: Determine the loading nodes of component static test; Determine the initial distribution of loading loads at each loading node; Construct a finite element model for component static testing, perform finite element analysis, obtain the sensitivity coefficients of the assessment target to each loading node, and then construct a sensitivity coefficient matrix; Construct a finite element model of the theoretical state of the component, perform finite element analysis, obtain the target response error under the static test and theoretical state finite element model of the component, and then construct a response error matrix; Using the sensitivity coefficient matrix and the response error matrix, the increment of the loading load of each loading node is calculated and the loading load of each loading node is updated until the target response error of the component static test and the theoretical state finite element model meets the requirements, and the loading load of each loading node is obtained; The initial distribution of the loading load of each loading node is determined as follows: According to the principle of theoretical total load and total moment unchanged and control section error control, the initial distribution scheme of loading load for each loading node is determined, and then the loading load for each loading node is calculated.

2. The method for determining the loading node load of a component static test according to claim 1, characterized in that: The determination of the component static test loading node is specifically as follows: Determine the loading nodes of the component static test based on the component's structural form and theoretical load distribution.

3. The method for determining the loading node load of a component static test according to claim 1, characterized in that: The assessment targets include the joint support reaction force, node displacement, unit strain and stress on the component.

4. The method for determining the loading node load of a component static test according to claim 1, characterized in that: The sensitivity coefficient matrix and the response error matrix are used to calculate the increment of the load on each loading node, specifically: dp=S -1 *F; in, dp is the incremental matrix of the load applied to each loading node; S is the sensitivity coefficient matrix; F is the response error matrix.

5. The method for determining the loading node load of a component static test according to claim 1, characterized in that: The sensitivity coefficient matrix and the response error matrix are used to calculate the increment of the load on each loading node, specifically: Calculate the minimum value of the quadratic programming objective function dp′*S′*S*dp-2*(S′*F)′*dp and obtain the corresponding dp; in, dp is the incremental matrix of the load applied to each loading node; S is the sensitivity coefficient matrix; F is the response error matrix.

6. The method for determining the loading node load of a component static test according to claim 1, characterized in that: The sensitivity coefficient matrix and the response error matrix are used to calculate the increment of the load on each loading node, specifically: Theoretical total load moment is used for equality constraint, and section error is used for inequality constraint. The upper and lower limits of the load at each loading point are restricted, and the nonlinear programming objective function (S*dp-F) is calculated. ′ *(S*dp-F) minimum value, get the corresponding dp; in, dp is the incremental matrix of the load applied to each loading node; S is the sensitivity coefficient matrix; F is the response error matrix.

7. The method for determining loading node loads in a component static test according to claim 1, characterized in that: When the assessment target response error cannot meet the requirements under the component static test and theoretical state finite element model, the assessment target response error weighting matrix is ​​set to adjust the assessment target response error.

8. The method for determining loading node loads in a component static test according to claim 1, characterized in that: When the assessment target response error meets the requirements under the static test of the component and the theoretical state finite element model, but the local strain in the non-assessment area is too large, the local strain in the non-assessment area is added to the assessment target.

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