Method for simulating statically indeterminate boundary of static test with connecting joint part
By releasing some displacement constraints and applying active loads in the static test of the connecting joint components, the finite element model was updated, solving the problem that the existing technology could not accurately simulate the force transmission path, and achieving more accurate test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA AIRPLANT STRENGTH RES INST
- Filing Date
- 2022-09-07
- Publication Date
- 2026-06-23
Smart Images
Figure CN116257929B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of static test of components with connecting joint parts, and particularly relates to a static test superstatic boundary simulation determination method for components with connecting joint parts. BACKGROUND
[0002] There are a large number of components connected through connecting joints in an airplane. At present, when the static test is performed on the components, a hinge constraint is directly applied at the connecting joint part of the component to simulate the boundary condition of the component. This technical scheme has the following defects:
[0003] When the stiffness of the separation surface of the component is weak, obvious relative deformation occurs between the connecting joints. The deformation freedom of the connecting joints is limited by the hinge constraint, so that the load distribution and the load transmission path of the component cannot be accurately simulated during the static test, and accurate test results cannot be obtained.
[0004] It should be noted that the disclosure of the above background art is only used to assist in understanding the inventive concept and technical scheme of the application, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY
[0005] The purpose of the present application is to provide a static test superstatic boundary simulation determination method for components with connecting joint parts, so as to overcome or alleviate at least one aspect of the technical defects known.
[0006] The technical scheme of the present application is:
[0007] A static test superstatic boundary simulation determination method for components with connecting joint parts, comprising:
[0008] performing finite element analysis under the actual state of the component;
[0009] performing finite element analysis under the hinge constraint state of each connecting joint on the boundary of the component;
[0010] If the deviation between the node force of each connecting joint and the element strain on the main load transmission path under the actual state of the component and under the hinge constraint state of each connecting joint on the component exceeds the deviation set value, then:
[0011] On the basis of the hinged constraint state of each connecting joint on the component, displacement constraints of part of the connecting joints in part directions are released, active loads are applied on part of the connecting joints, the finite element model is updated according to the new boundary conditions, the optimization model is constructed to correct the active loads, until the deviations of each connecting joint node force, the main force transmission path element strain and the actual state of the component are within the deviation setting value range, and then the accurate simulation of the statically indeterminate boundary of the component static test is obtained.
[0012] According to at least one of the embodiments of the present application, in the simulation method of the statically indeterminate boundary of the component static test with connecting joints, on the basis of the hinged constraint state of each connecting joint on the component, displacement constraints of part of the connecting joints in part directions are released, and the finite element model is updated according to the new boundary conditions, which specifically comprises:
[0013] According to the relative deformation between each connecting joint in the actual state of the component, on the basis of the hinged constraint state of each connecting joint on the component, displacement constraints of part of the connecting joints in part directions are released, and the finite element model is updated.
[0014] According to at least one of the embodiments of the present application, in the simulation method of the statically indeterminate boundary of the component static test with connecting joints, the relative deformation between each connecting joint in the actual state of the component is calculated from the node displacement of each connecting joint in the actual state of the component.
[0015] According to at least one of the embodiments of the present application, in the simulation method of the statically indeterminate boundary of the component static test with connecting joints, on the basis of the hinged constraint state of each connecting joint on the component, active loads are applied on part of the connecting joints, the finite element model is updated according to the new boundary conditions, and the optimization model is constructed to correct the active loads or displacement, which specifically comprises:
[0016] According to the deviation between each connecting joint node force in the actual state of the component and in the hinged state of each connecting joint on the component, on the basis of the hinged constraint state of each connecting joint on the component, active loads are applied on part of the connecting joints, the finite element model is updated according to the new boundary conditions, the optimization model is constructed to correct the joint active load, the joint active load is taken as the optimization design variable, the joint load and the element strain deviation (compared with the actual state of the component) on the main force transmission path are taken as the optimization target, the load card of the finite element model is iterated on the finite element simulation model platform of the section structure, the joint load and the element strain are extracted in real time and compared with the actual state of the component to calculate the error, and the optimal joint active load is obtained through optimization convergence. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 FIG. 1 is a schematic diagram of simulation and determination of the statically indeterminate boundary of the static test of an aircraft outer wing according to an embodiment of the present application.
[0018] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual size of the product. Furthermore, the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Detailed Implementation
[0019] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.
[0020] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.
[0021] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a 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 or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.
[0022] The following is in conjunction with the appendix Figure 1This application will be described in further detail.
[0023] A method for simulating and determining the statically indeterminate boundary of a component with a connecting joint in a static test, comprising:
[0024] Perform finite element analysis on the actual state of the component;
[0025] Perform finite element analysis on each connecting joint of the component under hinged constraint.
[0026] If the deviations between the forces at each connection joint node and the strain between elements on the main force transmission path exceed the set deviation value under the actual state of the component and the hinged state of each connection joint on the component boundary, then:
[0027] Based on the hinged constraint state of each connecting joint on the component, the displacement constraints of some connecting joints in some directions are released, and active loads are applied to some connecting joints. The finite element model is updated according to the new boundary conditions, and an optimization model is constructed to correct the active loads or displacements until the deviations between the obtained nodal forces of each connecting joint, the element strains on the main force transmission path and the actual state of the component are within the deviation set value range. Thus, the accurate simulation of the statically indeterminate boundary of the component in static test is obtained.
[0028] Regarding the method for simulating and determining the statically indeterminate boundary of a component with connecting joints disclosed in the above embodiments, those skilled in the art will understand that it is based on finite analysis of the actual state of the component and the hinged constraint state of each connecting joint on the component. When the deviation between the nodal force of each connecting joint and the strain of the unit on the main force transmission path exceeds the deviation set value under the actual state of the component and the hinged constraint state of each connecting joint, the method adjusts the displacement constraint of some connecting joints in some directions under the hinged constraint state of each connecting joint on the component, and applies active loads to some connecting joints. An optimization model is constructed to optimize the active loads, so that the deviation between the nodal force of each connecting joint and the strain of the unit on the main force transmission path and the nodal force of each connecting joint under the actual state of the component is within the deviation set value range. Thus, the statically indeterminate boundary of the component is accurately simulated. Based on this, the component static test is conducted, the displacement constraint of each connecting joint of the component is designed, and the active load is applied. The force transmission path and load distribution of the component can be accurately simulated, and accurate test results can be obtained. The deviation set value can be determined by relevant personnel according to the specific actual situation when applying the technical solution disclosed in this application, and will not be explained in more detail here.
[0029] In some optional embodiments, in the above-described method for determining the statically indeterminate boundary in a static test of a component with connecting joints, the step of releasing the displacement constraints of some connecting joints in certain directions based on the hinged constraint state of each connecting joint on the component, and updating the finite element model according to the new boundary conditions, specifically involves:
[0030] Based on the relative deformation between the joints in the actual state of the component, and on the basis of the hinged constraint state of each joint on the component, the displacement constraints of some joints in some directions are released. Specifically, the displacement constraints in the direction with large relative deformation between the joints can be released. In the static test of the component, to cancel the hinged constraint of the corresponding joint, a single degree of freedom limit is performed in the direction where displacement constraint is required, and the finite element model is updated.
[0031] In some optional embodiments, in the above-described method for determining the statically indeterminate boundary of a component with connecting joints under static testing, the relative deformation between the connecting joints under the actual state of the component is calculated from the nodal displacement of each connecting joint under the actual state of the component.
[0032] In some optional embodiments, in the above-described method for determining the statically indeterminate boundary of a component with connecting joints under static testing, the step of applying an active load to some connecting joints based on the hinged state of each connecting joint on the component, updating the finite element model according to the new boundary conditions, and constructing an optimized model to correct the active load or displacement specifically involves:
[0033] Based on the deviations between the forces at each joint node under the actual and hinged states of the component, active loads are applied to some joints. In the static test of the component, this corresponds to applying active loads through the actuator cylinder. The finite element model is updated according to the new boundary conditions, and an optimization model is constructed to correct the active loads on the joints. The active loads on the joints are used as the optimization design variable, and the deviations in element strain along the load and main force transmission path (compared to the actual state of the component) are used as the optimization objectives. On the finite element simulation model platform for the segment structure, the load cards of the finite element model are iterated, and the joint loads and element strains are extracted in real time and compared with the calculation errors under the actual state of the component. The optimal active load on the joints is obtained through optimization and convergence.
[0034] In one specific embodiment, a static test is conducted on the outer wing, which is connected to the inner wing via four connecting joints on the front and rear spars. Using the statically indeterminate boundary simulation method for the connecting joint components disclosed in the above embodiment, the statically indeterminate boundary simulation of the outer wing static test is obtained. The process is as follows:
[0035] 1. Perform finite element simulation analysis under the full aircraft condition, extract the nodal forces and nodal displacements of the four connecting joints between the outer wing and the inner wing, compare the nodal displacements of each connecting joint, and calculate the relative deformation between the connecting joints.
[0036] 2. Hinge constraints were applied to the four connecting joints of the outer wing. The inertial load and aerodynamic load on the wing surface were applied in the same way as the whole aircraft. Finite element simulation analysis was performed to extract the nodal forces of the four connecting joints. The results were compared with the whole aircraft and it was found that there was a large error in the load distribution of the front and rear spars of the outer wing in the main load direction, which exceeded the deviation setting value.
[0037] 3. Analyze the relative deformation of the four connecting joints of the outer wing under full-aircraft conditions. The in-plane deformation of the four connecting joints is small, and the centers of the four connecting joints remain in the same plane in the y-direction. There is a large relative deformation in the z-direction between the two connecting joints on the front spar and the two connecting joints on the rear spar of the outer wing. The connecting joints on the front and rear spars of the outer wing are under compression, while the lower connecting joints are under tension. The tensile load on the rear spar is small, so the hinge constraints on the connecting joints on the upper parts of the front and rear spars of the outer wing can be maintained. Release the constraint on the lower connecting joint of the front spar in the z-direction, and release the hinge constraints on the upper connecting joint of the rear spar in the x, y, and z directions. Apply active loads in the y and z directions to the connecting joint on the lower part of the rear spar, update the finite element model, and so on. Figure 1 As shown, an optimization model is constructed to solve for the active loads in the y and z directions applied to the connecting joints below the rear beam. The nodal forces of the four connecting joints and the element strains on the main force transmission path are not exceeded by the deviation set value compared with the aircraft under the overall condition. This results in an accurate simulation of the statically indeterminate boundary of the outer wing static test.
[0038] The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0039] The technical solution of this 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 this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.
Claims
1. A method for simulating and determining the statically indeterminate boundary in a static test with connecting joint components, characterized in that, include: Perform finite element analysis on the actual state of the component; Perform finite element analysis on each connecting joint at the component boundary under hinged constraint state. If, under the actual condition of the component, under the hinged condition of each connecting joint on the component, the strain deviation of each unit along the main force transmission path exceeds the set deviation value, then: Based on the relative deformation between the joints under the actual condition of the component, and on the basis of the hinged constraint state of each joint on the component boundary, the displacement constraints of some joints in some directions are released, and active loads are applied to some joints. The finite element model is updated according to the new boundary conditions, and an optimization model is constructed to correct the active loads until the deviations of the nodal forces of each joint and the strain of the main force transmission path elements from the actual condition of the component are within the deviation set value range. Thus, the accurate simulation of the statically indeterminate boundary of the component static test is obtained.
2. The method for simulating and determining the statically indeterminate boundary of a component with a connecting joint in a static test according to claim 1, characterized in that, The relative deformation between the various connecting joints of the component under actual conditions is calculated from the nodal displacement of each connecting joint under actual conditions of the component.
3. The method for simulating and determining the statically indeterminate boundary of a component with a connecting joint in static testing according to claim 2, characterized in that, Based on the hinged constraint state of each connection joint on the component boundary, active loads are applied to some connection joints. The finite element model is updated according to the new boundary conditions, and an optimized model is constructed to correct the active loads or displacements. Specifically: Based on the hinged constraint state of each connection joint on the component, active loads are applied to some connection joints. The finite element model is updated according to the new boundary conditions, and an optimization model is constructed to correct the active loads of the joints. The active loads of the joints are used as the optimization design variables, and the strain deviations of the elements on each joint load and the main force transmission path are used as the optimization objectives. On the finite element simulation model platform of the segment structure, the load cards of the finite element model are iterated, the joint loads and element strains are extracted in real time, and the calculation errors are compared with those under the actual state of the component. The optimal active load of the joints is obtained by optimization convergence.