Variable stiffness mechanism, frame structure and simulation test device

Abstract

The utility model discloses a variable stiffness mechanism, a frame structure and a simulation test device. The variable stiffness mechanism comprises a frame body (110); the material layers (120) are connected in the frame body (110) and are sequentially stacked in the longitudinal direction (Y); and the connecting rod (130) sequentially penetrates through the frame body (110) and the material layer (120) and is configured to be detachably connected with the frame body (110) and the material layer (120). The frame body and the material layers are connected together through the connecting rods to form a structural part with certain rigidity, different rigidity changes of the structure are achieved by selecting different material layers and the connecting rods, therefore, the deformation mode and the damage mode of the frame structure are adjusted, the test requirement is met, and the structure is reliable and high in flexibility.

Description

Technical Field

[0001] This utility model relates to the field of construction, and in particular to a variable stiffness mechanism, a frame structure, and a simulation test device. Background Technology

[0002] In architectural structural design, lateral deformation primarily depends on the building's lateral stiffness, which is inextricably linked to the stiffness of each column. Vertical deformation is mainly caused by the stiffness of the beams. In teaching experiments, it's impossible to conduct every experiment involving the impact of changes in beam and column stiffness on the deformation and failure of structures and components. Even when selecting typical teaching experiments for simulation, a large number of architectural models are required. Some teaching methods also necessitate destructive experiments on these models, rendering them unusable after each experiment. This not only impacts the sustainability of teaching but also represents a significant waste of teaching resources. Summary of the Invention

[0003] This solution addresses the problems and needs raised above by proposing a variable stiffness mechanism, a frame structure, and a simulation test device. Due to the adoption of the following technical features, it can achieve the above-mentioned technical objectives and bring about several other technical effects.

[0004] One objective of this invention is to provide a variable stiffness mechanism, comprising:

[0005] Framework body;

[0006] The material layers are connected within the frame body and are stacked sequentially along the longitudinal direction.

[0007] A connecting rod is sequentially inserted through the frame body and the material layer, configured to detachably connect the frame body and the material layer.

[0008] In this technical solution, the frame body and material layers are connected together by connecting rods to form a structural component with a certain stiffness. By selecting different material layers and connecting rods, different stiffness variations of the structure can be achieved, thereby adjusting the deformation and failure modes of the frame structure. Under the same load, the same building structure model can produce different deformation and failure states. Moreover, the structure is reliable, highly flexible, and reusable.

[0009] In addition, the variable stiffness mechanism, frame structure, and simulation test device according to this utility model may also have the following technical features:

[0010] In one example of this utility model, the connecting rod is a shape memory metal rod or a rigid metal rod.

[0011] In one example of this utility model, the material layer comprises:

[0012] A variable material layer and a damping material layer, wherein the variable material layer and the damping material layer are arranged alternately along the longitudinal direction, and the connecting rod passes through the variable material layer and the damping material layer.

[0013] In one example of this utility model,

[0014] The variable material layer is at least one of the following: steel plate, pearl cotton, rubber, and plastic.

[0015] The damping material layer is at least one of the following: steel balls, epoxy resin adhesive, sandblasting, and lubricant.

[0016] In one example of this invention, when the variable material layer is a steel plate and the damping material layer is a steel ball,

[0017] In the two adjacent variable material layers, a plurality of grooves are provided on one side end face of one of the variable material layers, and the other variable material layer covers the upper end of the grooves to form a receiving cavity, and the steel ball is adapted to the receiving cavity;

[0018] The connecting rod is a rigid metal rod.

[0019] In one example of this utility model,

[0020] When the variable material layer is steel plate and rubber, and the damping material layer is epoxy resin adhesive.

[0021] The steel plates and the rubber are arranged alternately along the longitudinal direction, and the epoxy resin adhesive is disposed between adjacent steel plates and rubber.

[0022] The connecting rod is a shape memory metal rod.

[0023] Another objective of this utility model is to propose a frame structure, including:

[0024] As described above, the variable stiffness mechanism, node modules, and frame columns are connected to adjacent frame columns via node modules, and the node modules and the frame columns are fastened together via the variable stiffness mechanism.

[0025] In one example of this utility model, in the node module and the variable stiffness mechanism or in the frame column and the variable stiffness mechanism, one of them is provided with a wedge-shaped groove, and the other is provided with a wedge-shaped block adapted to the wedge-shaped groove.

[0026] Fastening mechanisms are provided at the connection points between the node module and the variable stiffness mechanism, and at the connection points between the frame column and the variable stiffness mechanism, to fix the connection points between the node module and the variable stiffness mechanism or the connection points between the frame column and the variable stiffness mechanism.

[0027] In one example of this utility model, in either the node module and the variable stiffness mechanism or the frame column and the variable stiffness mechanism, a bolt is provided on one of them, and a threaded hole that mates with the bolt is provided on the other.

[0028] Another objective of this invention is to provide a simulation test device, comprising:

[0029] The framework structure described above;

[0030] A test bench, wherein the frame structure is disposed on the test bench, and the test bench is configured to apply vibration to the frame structure;

[0031] The acquisition system includes a signal acquisition module and a signal analysis module. The signal acquisition module is installed on the frame structure and configured to acquire the vibration signal of the frame structure. The signal analysis module is coupled to the signal acquisition module and configured to receive and analyze the vibration signal.

[0032] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, so as to facilitate an understanding of the features and advantages of the present invention. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. The drawings are merely illustrative of some embodiments of this utility model and are not intended to limit the scope of all embodiments of this utility model.

[0034] Figure 1 This is a schematic diagram of the variable stiffness mechanism according to the first embodiment of the present invention;

[0035] Figure 2 This is a structural schematic diagram of a variable stiffness mechanism according to the second embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure between the material layers according to the second embodiment of the present invention;

[0037] Figure 4 This is a structural schematic diagram of a variable stiffness mechanism according to the third embodiment of the present invention;

[0038] Figure 5 This is a structural schematic diagram of the variable stiffness mechanism according to the fourth embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the frame structure according to the first embodiment of the present utility model;

[0040] Figure 7 This is a schematic diagram of the frame structure according to the second embodiment of the present utility model;

[0041] Figure 8 This is a schematic diagram of the frame structure according to the third embodiment of the present utility model;

[0042] Figure 9 This is a schematic diagram of the frame structure according to the fourth embodiment of the present utility model.

[0043] List of reference numerals in the attached diagram:

[0044] Frame structure 1000;

[0045] Frame column 300;

[0046] Threaded hole 310;

[0047] Wedge block 320;

[0048] Node module 200;

[0049] Variable stiffness mechanism 100;

[0050] Frame body 110;

[0051] Bolt 111;

[0052] Wedge-shaped slot 112;

[0053] Material layer 120;

[0054] Variable material layer 121;

[0055] Groove 1210;

[0056] Receptacle 121A;

[0057] Steel plate 1211;

[0058] Rubber 1212;

[0059] Damping material layer 122;

[0060] Connecting rod 130;

[0061] Lateral direction X;

[0062] The vertical direction is Y. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0064] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0065] According to a first aspect of this utility model, a variable stiffness mechanism 100 is provided, such as... Figures 1 to 9 As shown, it includes:

[0066] Frame body 110;

[0067] Material layer 120 is connected within the frame body 110 and is stacked sequentially along the longitudinal direction Y.

[0068] The connecting rod 130 passes through the frame body 110 and the material layer 120 in sequence, and is configured to detachably connect the frame body 110 and the material layer 120.

[0069] In other words, the frame body 110 and the material layer 120 are connected together by the connecting rods to form a structural component with a certain stiffness. By selecting different material layers 120 and connecting rods 130, different stiffness changes of the structure can be achieved, thereby adjusting the deformation and failure modes of the frame structure to meet the test requirements. Moreover, the structure is reliable, flexible, and reusable.

[0070] In one example of this utility model, the connecting rod 130 is a shape memory metal rod or a rigid metal rod;

[0071] When the connecting rod 130 is a shape memory metal rod, the structure can have a certain degree of flexibility and is not prone to stiffness failure.

[0072] When the connecting rod 130 is a rigid metal rod, the structure can have a certain rigidity, which makes it prone to stiffness failure.

[0073] In one example of this utility model, the material layer 120 includes:

[0074] A variable material layer 121 and a damping material layer 122 are provided, wherein the variable material layer 121 and the damping material layer 122 are arranged alternately along the longitudinal direction Y, and the connecting rod 130 passes through the variable material layer 121 and the damping material layer 122.

[0075] By combining the variable material layer 121 and the damping material layer 122, the stiffness of the material layer 120 can be flexibly varied, meeting the test requirements for controlling the stiffness nodes.

[0076] In one example of this utility model,

[0077] The variable material layer 121 is at least one of steel plate 1211, pearl cotton, rubber 1212 and plastic; wherein the stiffness of steel plate 1211, pearl cotton, rubber 1212 and plastic decreases in that order.

[0078] The damping material layer 122 is at least one of the following: steel balls, epoxy resin adhesive, sandblasting, and lubricant. Among them, steel balls can increase the deformation of the variable material layer 121 and accelerate the failure of the connecting rod 130; epoxy resin adhesive can effectively bond and fix the variable material layer 121, increasing its stiffness; sandblasting can increase the friction between the variable material layers 121, thereby increasing its stiffness; and lubricant can reduce the friction between the variable material layers 121, thereby reducing its stiffness.

[0079] In one example of this utility model, when the variable material layer 121 is a steel plate 1211 and the damping material layer 122 is a steel ball,

[0080] In the two adjacent variable material layers 121, a plurality of grooves 1210 are provided on one side end face of one of the variable material layers 121, and the other variable material layer 121 covers the upper end of the grooves 1210 to form a receiving cavity 121A, and the steel ball is adapted to the receiving cavity 121A.

[0081] The connecting rod 130 is a rigid metal rod;

[0082] In other words, by placing steel balls between the steel plates 1211, the steel plates 1211 deform during the stress process of the variable stiffness mechanism 100, thereby accelerating the failure of the rigid metal rod and meeting the requirements of destructive control test.

[0083] In one example of this utility model,

[0084] When the variable material layer 121 is a steel plate 1211 and rubber 1212, and the damping material layer 122 is epoxy resin,

[0085] The steel plate 1211 and the rubber 1212 are arranged alternately along the longitudinal direction Y, and the epoxy resin adhesive is disposed between adjacent steel plates 1211 and rubber 1212.

[0086] The connecting rod 130 is a shape memory metal rod;

[0087] In other words, the alternating arrangement of steel plate 1211 and rubber 1212 can greatly reduce the stiffness of the variable stiffness mechanism 100, giving the structure a certain degree of flexibility. The memory metal rod itself has a certain degree of flexibility, and its combination with the aforementioned variable material layer 121 enables the structure to meet the test requirements for deformability.

[0088] A frame structure 1000 according to a second aspect of the present invention includes:

[0089] As described above, the variable stiffness mechanism 100, node module 200 and frame column 300 are connected to each other through node module 200, and the node module 200 and the frame column 300 are fastened together through the variable stiffness mechanism 100.

[0090] In other words, the existence of the variable stiffness mechanism 100 causes the stiffness structure between the frame columns 300 to change, which can satisfy the need to adjust the deformation and failure modes of the frame structure 1000 and meet the test requirements.

[0091] In one example of this utility model, in the node module 200 and the variable stiffness mechanism 100 or in the frame column 300 and the variable stiffness mechanism 100, one of them is provided with a wedge-shaped slot 112, and the other is provided with a wedge-shaped block 320 adapted to the wedge-shaped slot 112.

[0092] Among them, fastening mechanisms are provided at the connection between node module 200 and variable stiffness mechanism 100 and at the connection between frame column 300 and variable stiffness mechanism 100, which are configured to fix the connection between node module 200 and variable stiffness mechanism 100 or the connection between frame column 300 and variable stiffness mechanism 100.

[0093] The above structure can effectively fix the node module 200 and the variable stiffness mechanism 100, and the frame column 300 and the variable stiffness mechanism 100, and has high reliability.

[0094] For example, the fastening mechanism can be a sleeve, which is fitted on the outside of the corresponding connection. The fastening mechanism can also be a tenon and mortise structure, or of course, a fastener.

[0095] In one example of this utility model, in the node module 200 and the variable stiffness mechanism 100 or in the frame column 300 and the variable stiffness mechanism 100, one of them is provided with a bolt 111, and the other of them is provided with a threaded hole 310 that mates with the bolt 111.

[0096] Specifically, in this embodiment, the frame body 110 is a rigid plate, and the bolts 111 are fixed on the rigid plate. The node module 200 is pre-set with threaded holes 310. By the bolts 111 cooperating with the threaded holes 310, the node module 200 and the variable stiffness mechanism 100, and the frame column 300 and the variable stiffness mechanism 100 can be effectively connected.

[0097] A simulation test apparatus according to a third aspect of the present invention includes:

[0098] The frame structure 1000 described above;

[0099] A test bench, wherein the frame structure 1000 is disposed on the test bench, and the test bench is configured to apply vibration to the frame structure 1000;

[0100] The acquisition system includes a signal acquisition module and a signal analysis module. The signal acquisition module is installed on the frame structure 1000 and configured to acquire the vibration signal of the frame structure 1000. The signal analysis module is coupled to the signal acquisition module and configured to receive and analyze the vibration signal.

[0101] The test bench applies vibration to the frame structure 1000 located on it, thereby causing the frame structure 1000 to vibrate. The signal acquisition module is installed on the frame structure 1000 and can acquire the vibration signal of the frame structure 1000. The signal analysis module receives and analyzes the vibration signal to complete the corresponding test analysis.

[0102] The foregoing description, with reference to preferred embodiments, details exemplary implementations of the variable stiffness mechanism 100, device, and simulation test apparatus proposed by this utility model. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of this utility model, and various combinations can be made to the various technical features and structures proposed by this utility model without exceeding the protection scope of this utility model, which is determined by the appended claims.

Claims

1. A variable stiffness mechanism, characterized by, The variable stiffness mechanism comprises: a frame body (110); a material layer (120) connected in the frame body (110) and arranged in sequence along the longitudinal direction (Y); a connecting rod (130) sequentially penetrating the frame body (110) and the material layer (120) and configured to detachably couple the frame body (110) and the material layer (120).

2. The variable stiffness mechanism according to claim 1, wherein the connecting rod (130) is a memory metal rod or a rigid metal rod.

3. The variable stiffness mechanism according to claim 1, wherein the material layer (120) comprises: a variable material layer (121) and a damping material layer (122), wherein the variable material layer (121) and the damping material layer (122) are alternately arranged along the longitudinal direction (Y), and the connecting rod (130) penetrates the variable material layer (121) and the damping material layer (122).

4. The variable stiffness mechanism according to claim 3, wherein the variable material layer (121) is at least one of a steel plate (1211), pearl wool, rubber (1212) and plastic; the damping material layer (122) is at least one of a steel ball, epoxy resin glue, sandblasting and lubricant.

5. The variable stiffness mechanism according to claim 4, wherein when the variable material layer (121) is a steel plate (1211) and the damping material layer (122) is a steel ball, a plurality of grooves (1210) are arranged on one side end face of one of the adjacent two variable material layers (121), and the other variable material layer (121) is arranged on the upper end of the grooves (1210) to form a receiving cavity (121A), and the steel ball is fitted in the receiving cavity (121A); wherein the connecting rod (130) is a rigid metal rod.

6. The variable stiffness mechanism according to claim 4, wherein when the variable material layer (121) is a steel plate (1211) and rubber (1212), and the damping material layer (122) is epoxy resin glue, the steel plate (1211) and the rubber (1212) are alternately arranged in sequence along the longitudinal direction (Y), and the epoxy resin glue is arranged between the adjacent steel plate (1211) and rubber (1212); wherein the connecting rod (130) is a memory metal rod.

7. A frame structure, characterized by, The frame structure comprises: the variable stiffness mechanism (100), the node module (200) and the frame column (300) according to any one of claims 1 to 6, adjacent frame columns (300) are connected through the node module (200), and the node module (200) and the frame column (300) are tightly coupled through the variable stiffness mechanism (100).

8. The frame structure according to claim 7, wherein In the node module (200) and the variable stiffness mechanism (100) or the frame column (300) and the variable stiffness mechanism (100), one of which is configured with a wedge-shaped clamping groove (112), and the other of which is configured with a wedge-shaped block (320) matched with the wedge-shaped clamping groove (112); Wherein, a fastening mechanism is arranged at the connection between the node module (200) and the variable stiffness mechanism (100) or the connection between the frame column (300) and the variable stiffness mechanism (100), and is configured to fix the connection between the node module (200) and the variable stiffness mechanism (100) or the connection between the frame column (300) and the variable stiffness mechanism (100).

9. The frame structure according to claim 7, characterized in that, In the node module (200) and the variable stiffness mechanism (100) or the frame column (300) and the variable stiffness mechanism (100), one of which is configured with a bolt (111), and the other of which is configured with a threaded hole (310) matched with the bolt (111).

10. A simulation test device, characterized by comprising: Comprise: The frame structure (1000) according to claim 7; A test bench, wherein the frame structure (1000) is arranged on the test bench, and the test bench is configured to apply vibration to the frame structure (1000); and a collection system comprising a signal collection module and a signal analysis module, wherein the signal collection module is installed on the frame structure (1000) and is configured to collect vibration signals of the frame structure (1000), and the signal analysis module is coupled to the signal collection module and is configured to receive and analyze the vibration signals.

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