Buckling beam and quasi-zero stiffness vibration isolator
By setting deformation release zones at both ends of the buckling beam, the problems of high complexity, high cost and high stress in the existing buckling beam are solved, and the negative stiffness is improved and stress reduction is reduced. It is suitable for quasi-zero stiffness vibration isolators design.
Patent Information
- Application Number
- CN202411150646.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-02-14
AI Technical Summary
In the quasi-zero-stiffness vibration isolators, existing buckling beams have problems with high structural complexity, high cost and high stress, and it is difficult to take into account the requirements of negative stiffness and low stress.
A buckling beam is designed, with deformation release areas arranged at both ends. By increasing the bending degree and distribution of the deformation release areas, negative stiffness is enhanced and stress is reduced.
The better stress release effect of the buckled beam when bending is achieved, the negative stiffness is improved, and the structural stress is reduced, and the structural design is simplified.
Smart Images
Figure CN119435626A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of vibration reduction and isolation, and in particular relates to a buckling beam and a quasi-zero stiffness vibration isolator. Background Art
[0002] Quasi-zero stiffness isolators have the characteristics of high static stiffness and low dynamic stiffness. The "high static" characteristic gives it a large load-bearing capacity, and the "low dynamic" characteristic gives it a good vibration isolation effect under low-frequency excitation. Quasi-zero stiffness isolators are generally composed of positive stiffness elements and negative stiffness mechanisms in parallel, and the quasi-zero stiffness effect is achieved by offsetting the positive and negative stiffness. There are many ways to achieve negative stiffness, such as using linear springs to combine into geometric nonlinear mechanisms, magnetic springs, buckling beams, etc. Among them, buckling beams have the characteristics of compact structure, simple shape, and high pure structural reliability, which has great advantages in reducing the cost of quasi-zero stiffness isolators. The buckling beam structure is installed in the quasi-zero stiffness isolator by means of hinged or fixed supports at both ends. The advantages of hinged supports are high negative stiffness and convenient design; the disadvantages are increased structural complexity and increased cost. The advantages of fixed supports are simple structure and low cost; the disadvantages are reduced negative stiffness and high structural stress. Summary of the invention
[0003] In order to solve the above technical problems, one of the objectives of the present invention is to provide a buckling beam with a simple structure, good negative stiffness and low stress.
[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a buckled beam comprises a buckled beam body, and deformation release areas are arranged at both ends of the buckled beam body.
[0005] The beneficial effect of the above technical solution is that by providing a deformation release zone on the buckling beam, the bending degree of the deformation release zone can be increased when the buckling beam is bent, and the stress of the deformation release zone when bending is small.
[0006] In the above technical solution, each end of the buckling beam body is provided with a deformation release zone.
[0007] The beneficial effect of the above technical solution is that it makes the stress release effect of the buckled beam better when bending.
[0008] In the above technical solution, the two deformation release zones are symmetrically distributed at corresponding middle positions along the length direction of the buckling beam body.
[0009] The beneficial effect of the above technical solution is that it can further improve the stress release effect of the buckled beam when it is bent.
[0010] In the above technical solution, the distance between each deformation release zone and the corresponding end of the buckling beam body is L1, the distance between two deformation release zones is L2, and L2 is 1-3 times of L1.
[0011] The beneficial effect of the above technical solution is that it has a simple structure.
[0012] The buckling beam body described in the above technical solution includes a middle flat beam and two end flat beams, both ends of the middle flat beam are recessed with notch grooves, one end of the end flat beam is convexly provided with a convex portion extending into the corresponding notch groove, and an n-shaped gap is provided between the convex portion and the corresponding notch groove, each side of the end of the convex portion is connected to the corresponding side of the notch groove through a connecting strip, and each of the connecting strips is integrally formed with the connection between the middle flat beam and the end flat beam, and the connection between each end of the middle flat beam and the corresponding end flat beam constitutes the deformation release zone.
[0013] The beneficial effects of the above technical solution are: its structure is simple, so that each end flat beam is connected to the corresponding end of the middle flat beam through two connecting strips for integral molding, and when the middle flat beam and the end flat beam are bent, the two ends of the connecting strip can form a larger bending angle at the connection between the convex portion and the notch groove, thereby enhancing the negative stiffness and significantly reducing the stress in the deformation release zone, making it easier to bend.
[0014] In the above technical solution, the two ends of the connecting strip are bent to be away from each other and connected to the convex portion and the notch groove respectively.
[0015] The beneficial effects of the above technical solution are: its structure is simple, and the connecting strip, the notch groove and the convex portion do not interfere with each other.
[0016] The buckling beam body in the above technical solution is a spring piece.
[0017] The beneficial effect of the above technical solution is that it has good elasticity.
[0018] The ends of both ends of the buckling beam body in the above technical solution are both provided with penetrating connection holes.
[0019] The beneficial effect of the above technical solution is that such a suitable buckling beam body can be fixedly installed by screws passing through the connection holes.
[0020] A second object of the present invention is to provide a quasi-zero stiffness isolator with a simple structure, good negative stiffness of the buckled beam, and low stress.
[0021] In order to achieve the above object, another technical solution of the present invention is as follows: a quasi-zero stiffness vibration isolator comprises the buckling beam as described above.
[0022] The beneficial effect of the above technical solution is that the buckling beam of the quasi-zero stiffness isolator has good negative stiffness, small stress when bent, and better flexibility.
[0023] The above technical solution also includes a base, a load block, an elastic element and a damping element. The base is in the shape of a slot with the slot facing upward. The load block is placed above the middle of the slot of the base. The lower end of the load block is connected to the middle of the bottom wall of the base through the elastic element and the damping element. The lower ends of both sides of the load block are connected to the corresponding side slots of the base through the buckling beams.
[0024] The beneficial effect of the above technical solution is that by adopting the buckling beam with a deformation release zone, the negative stiffness of the entire quasi-zero stiffness isolator is improved, the structural stress is relatively reduced, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic structural diagram of the buckled beam according to Embodiment 1 of the present invention;
[0026] Figure 2 Schematic diagram of the analytical structure of the deformation release zone on the buckled beam in Example 1 of the present invention;
[0027] Figure 3 is a side view of the buckled beam described in Example 1 of the present invention;
[0028] Figure 4 Schematic diagram of setting the lengths of various components of the buckled beam in Example 1 of the present invention;
[0029] Figure 5 This is a schematic structural diagram of the quasi-zero stiffness vibration isolator described in Example 2 of the present invention;
[0030] Figure 6 Two state diagrams of the quasi-zero stiffness isolator in the embodiment 2 of the present invention in the initial state and the equilibrium state;
[0031] Figure 7 It is a structural schematic diagram of a buckling beam fixedly installed in the prior art;
[0032] Figure 8 It is a structural schematic diagram of a hinged buckling beam installed in the prior art;
[0033] Fig. 9 for Figure 8 The corresponding side view of the buckled beam in ;
[0034] Fig.10 It is a structural schematic diagram of a quasi-zero stiffness vibration isolator with a buckled beam hinge in the prior art;
[0035] Fig.11 for Fig.10 Two state diagrams of the quasi-zero stiffness isolator in the initial state and equilibrium state.
[0036] In the figure: 1 buckling beam; 11 buckling beam body; 12 deformation release area; 111 middle flat beam; 1111 notch groove; 112 end flat beam; 1121 convex portion; 113 connecting strip; 13 connecting hole; 14 hinge hole; 2 base; 3 load block; 4 elastic element; 5 damping element; 6 hinge shaft. DETAILED DESCRIPTION
[0037] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0038] The structure of the buckling beam of the existing quasi-zero stiffness isolator is a straight strip plate (square plate), and there are two ways to install it, one is a fixed connection method and the other is a hinged method. Figure 7-Figure 9 As shown, Figure 7 For example ( Figure 7 The buckling beam is a fixedly mounted buckling beam, in which connecting holes 13 are provided at both ends of the buckling beam for connecting the two ends of the buckling beam with the base and the load block (the specific connection method is to connect the base and the load block by setting screws or bolts through the connecting holes). At this time, the structure of the entire quasi-zero stiffness isolator is similar to Figure 5 and Figure 6 As shown, when the load block is subjected to a downward force F, the two ends of the buckling beam will bend and the whole will be in an "S" shape; Figure 8 and Fig. 9 The buckling beam in the embodiment is a buckling beam installed in an articulated manner, and hinge holes are provided at both ends of the buckling beam. At this time, the connection between the two ends of the buckling beam and the load block is vertically swing-connected through the hinge shaft 6. At this time, the two ends of the buckling beam have a vertical swing margin. At this time, the structure of the entire quasi-zero stiffness isolator is similar to Fig.10 and Fig.11 As shown, Figure 5 and Fig.10 They respectively represent the morphological bending structures of the corresponding buckled beams when the load block moves downward; Figure 6 and Fig.11 The following are schematic diagrams of the shape changes of the load block under different states of the buckled beam under two installation methods of the buckled beam, where: Figure 6 and Fig.11When the buckled beam is a dotted line, it is a schematic diagram of the load block in the initial state; when the buckled beam is a solid line, it is a schematic diagram of the load block moving down to the equilibrium state.
[0039] Among them, the quasi-zero stiffness isolator in the prior art includes a base, a load block, an elastic element, a damping element and a buckling beam, the base is in the shape of a slot with the slot facing upward, the load block is placed above the middle of the slot of the base, the lower end of the load block is connected to the middle of the inner bottom wall of the base through the elastic element and the damping element, the lower ends of both sides of the load block 3 are respectively connected to the corresponding side slots of the base 2 through the buckling beam 1, and each side of the load block can be provided with multiple buckling beams spaced apart along its width direction to connect with the corresponding sides of the slot of the base (the difference is whether the buckling beam is installed in a fixed manner or in a hinged manner).
[0040] The buckling beam is a spring piece (specifically a rectangular spring piece), which can be a steel sheet or a plastic sheet with elasticity.
[0041] Example 1
[0042] like Figure 1 and Figure 3 As shown, this embodiment improves the buckling beam on the basis of the prior art (mainly improves the buckling beam of the fixed connection method). The buckling beam provided in this embodiment includes a buckling beam body 11, and deformation release areas 12 are provided at both ends of the buckling beam body 11. By providing the deformation release areas on the buckling beam, the bending degree of the deformation release areas of the buckling beam can be increased when it is bent, and the stress of the deformation release areas when it is bent is small; wherein, the ends of both ends of the buckling beam body 11 are provided with penetrating connection holes 13, so that a suitable buckling beam body can be fixed and installed by screws passing through the connection holes.
[0043] In the above technical solution, each end of the buckled beam body 11 is provided with a deformation release zone 12, so that the stress release effect of the buckled beam is better when it is bent. Specifically, the two deformation release zones 12 are symmetrically distributed at the corresponding middle positions along the length direction of the buckled beam body 11, so that the stress release effect of the buckled beam when it is bent can be further improved. In this way, when the buckled beam is in a balanced state, its two deformation release zones are bent to form an "S" shape structure, and by adding deformation release zones, the stress at the bending position is smaller, the bending is more flexible, and the negative stiffness is good.
[0044] In the above technical solution, the distance between each deformation release zone 12 and the corresponding end of the buckling beam body 11 is L1, the distance between the two deformation release zones 12 is L2, and L2 is 1-3 times of L1 (preferably, L2=2L1, so that the coordination of the buckling beam is better when it is bent in an "S" shape), and its structure is simple.
[0045] Specifically, Figure 2 As shown, the buckling beam body 11 in the above technical solution includes a middle flat beam 111 and two end flat beams 112, both ends of the middle flat beam 111 are concavely provided with a notch groove 1111, one end of the end flat beam 112 is convexly provided with a convex portion 1121 extending into the corresponding notch groove 1111, and there is an n-shaped gap between the convex portion 1121 and the corresponding notch groove 1111, each side of the end of the convex portion 1121 is connected to the corresponding side of the notch of the notch groove 1111 through a connecting strip 113, and each of the connecting strips 113 is connected to the corresponding side of the notch groove 1111. The connection between the middle flat beam 111 and the end flat beam 112 is integrally formed, and the connection between each end of the middle flat beam 111 and the corresponding end flat beam 112 constitutes the deformation release zone 12, which has a simple structure, so that each end flat beam is integrally connected with the corresponding end of the middle flat beam through two connecting strips, and when the middle flat beam and the end flat beam are bent, the two ends of the connecting strip can form a larger bending angle at the connection between the convex part and the notch groove, so that the negative stiffness is enhanced, and the stress at the deformation release zone is significantly reduced, and the bending is easier. Preferably, the length of the convex part and the depth of the notch groove in this embodiment are equivalent, and can both be L1.
[0046] In the above technical solution, the two ends of the connecting strip 113 are bent away from each other and connected to the convex portion 1121 and the notch groove 1111 respectively. The structure is simple and the connecting strip does not interfere with the notch groove and the convex portion.
[0047] Among them, Figure 4 As shown, L1 refers to the distance from the end of the end flat beam to the root of the corresponding convex portion, and L2 refers to the distance between the bottoms of the two notched grooves of the middle flat beam.
[0048] The difference between the buckled beam provided in this embodiment and the buckled beam in the prior art with a fixed connection method is that a deformation release area 12 is provided on the buckled beam body in this embodiment.
[0049] The characteristics of the buckling beam in this embodiment are reflected in the two deformation release areas arranged thereon. For a single deformation release area, the end of its convex portion is fixedly connected to the notch of the notch groove by two connecting strips (integrally formed). In this way, when the buckling beam bends in the deformation release area, the convex portion can be cross-distributed with the notch groove, and the component that plays a transitional bending role is mainly the connecting strip. Since the connecting strip is in the shape of a thin strip, it is easier to bend and the stress is smaller.
[0050] Example 2
[0051] like Figure 5 and Figure 6 As shown, this embodiment provides a quasi-zero stiffness isolator, including a base 2, a load block 3, an elastic element 4, a damping element 5 and the buckling beam 1 as described in Example 1. The buckling beam of the quasi-zero stiffness isolator has good negative stiffness, small stress when bent, and better flexibility.
[0052] The specific structure of the quasi-zero stiffness vibration isolator is as follows: the base 2 is in the shape of a slot, with the slot facing upward, the load block 3 is placed above the middle of the slot of the base 2, the lower end of the load block 3 is connected to the middle of the inner bottom wall of the base 2 through the elastic element 4 and the damping element 5, the lower ends of both sides of the load block 3 are respectively connected to the corresponding side slots of the base 2 through the buckling beam 1, for a single buckling beam, one end thereof is fixedly connected to one side of the load block 3, and the other end thereof is fixedly connected to the corresponding side of the slot of the base 2, and by adopting a buckling beam with a deformation release zone, the entire quasi-zero stiffness vibration isolator has good negative stiffness, relatively reduced structural stress, and extended service life (the connection method of the various components of the quasi-zero stiffness vibration isolator belongs to the prior art, and the difference from the prior art is only reflected in the fact that a deformation release zone is provided on the buckling beam).
[0053] A plurality of buckling beams spaced apart along the width direction of the load block may be provided on each side of the load block.
[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.
Claims
1. A buckled beam, characterized in that: It comprises a buckling beam body (11), and deformation release areas (12) are arranged at both ends of the buckling beam body (11).
2. The buckled beam according to claim 1, characterized in that Each end of the buckling beam body (11) is provided with a deformation release zone (12).
3. The buckled beam according to claim 2, characterized in that: The two deformation release areas (12) are symmetrically distributed on the buckling beam body (11) at corresponding middle positions along its length direction.
4. The buckled beam according to claim 2, characterized in that: The distance between each deformation release zone (12) and the corresponding end of the buckling beam body (11) is L1, the distance between two deformation release zones (12) is L2, and L2 is 1 to 3 times of L1.
5. The buckled beam according to any one of claims 1 to 4, characterized in that: The buckling beam body (11) comprises a middle flat beam (111) and two end flat beams (112); both ends of the middle flat beam (111) are concavely provided with notch grooves (1111); one end of the end flat beam (112) is convexly provided with a convex portion (1121) extending into the corresponding notch groove (1111); and an n-shaped gap is provided between the convex portion (1121) and the corresponding notch groove (1111); each side of the end of the convex portion (1121) is connected to the corresponding side of the notch of the notch groove (1111) through a connecting strip (113); and each connecting strip (113) is integrally formed with the connection between the middle flat beam (111) and the end flat beam (112); and the connection between each end of the middle flat beam (111) and the corresponding end flat beam (112) constitutes the deformation release zone (12).
6. The buckled beam according to claim 5, characterized in that The two ends of the connecting strip (113) are respectively bent to be away from each other and are respectively connected to the convex portion (1121) and the notch groove (1111).
7. The buckled beam according to any one of claims 1 to 4, characterized in that: The buckling beam body (11) is a spring piece.
8. The buckled beam according to any one of claims 1 to 4, characterized in that: The ends of both ends of the buckling beam body (11) are provided with penetrating connection holes (13).
9. A quasi-zero stiffness vibration isolator, characterized in that: Comprising the buckled beam (1) as claimed in any one of claims 1 to 8.
10. The quasi-zero stiffness vibration isolator according to claim 9, characterized in that: It also comprises a base (2), a load block (3), an elastic element (4) and a damping element (5); the base (2) is in the shape of a slot with its slot facing upwards; the load block (3) is placed above the middle of the slot of the base (2); the lower end of the load block (3) is connected to the middle of the inner bottom wall of the base (2) through the elastic element (4) and the damping element (5); the lower ends of both sides of the load block (3) are connected to the corresponding side slots of the base (2) through the buckling beam (1) respectively.