A quasi-zero stiffness vibration isolation-energy capture integrated device and its application

Abstract

The present invention provides a quasi-zero stiffness vibration isolation and energy capture integrated device and its application, belonging to the field of vibration energy capture and vibration isolation; comprising a main frame, a load-bearing platform, an electromechanical conversion unit, a double-wing vibrator structure and a positive stiffness module, wherein the load-bearing platform is mounted on the main frame via the double-wing vibrator structure and the positive stiffness module; negative stiffness is provided by the double-wing vibrator structure, and positive stiffness is provided by the positive stiffness module, and the combination of the two realizes quasi-zero stiffness vibration isolation; and vibration energy capture is completed by the electromechanical conversion unit. The present invention uses a double-wing vibrator structure to provide negative stiffness, and a positive stiffness module to provide positive stiffness, and the combination of the two realizes quasi-zero stiffness vibration isolation; an electromechanical conversion unit is connected with the double-wing vibrator structure and the positive stiffness module to collect vibration energy, and the conversion of vibration energy into electrical energy is realized by an electromagnetic conversion method; the structure is simple, and can be widely used in mechanical processing, rail transportation, aerospace and other fields to power micro-electromechanical systems or embedded devices.

Description

Technical Field

[0001] The present invention belongs to the field of vibration energy capture and vibration isolation, and particularly relates to a quasi-zero stiffness vibration isolation-energy capture integrated device and its application. Background Art

[0002] Vibration is a ubiquitous natural phenomenon that offers numerous benefits, but also poses risks. Beneficial vibrations can be converted into other usable forms of energy, produce beautiful musical notes, transmit signals, and significantly contribute to improvements in human living standards and the development of military technology. However, when vibration exceeds a certain threshold, it can harm human health and equipment, potentially causing equipment to malfunction. For example, the vibration and noise caused by complex road conditions can severely compromise the stability of tactical vehicle-mounted directed energy weapon systems, preventing them from effectively striking targets while in motion and resulting in poor anti-interference performance. Converting these harmful vibrations into energy can both eliminate them and protect equipment, and capture the energy to power microelectronic devices. Therefore, vibration control and utilization have become key technologies and challenges in the design and development of modern high-tech equipment.

[0003] In the field of vibration control, traditional vibration isolators have poor low-frequency isolation performance. Recently developed, nonlinear quasi-zero-stiffness vibration isolators offer high static and low dynamic stiffness, effectively isolating vibration at low frequencies and possessing a load-bearing capacity superior to traditional isolators. Furthermore, research on biomimetic structures in vibration isolators has become a hot topic, such as the application of dual-wing vibrator structures.

[0004] In the field of vibration energy capture, currently common vibration energy harvesters include electromagnetic conversion, electrostatic conversion, piezoelectric conversion, and magnetostrictive types. Vibration energy capture technology, a key alternative to traditional batteries, aims to power various microelectromechanical systems (MEMS) or embedded devices. In most cases, energy capture using nonlinear techniques yields a wider effective operating bandwidth and a larger amplitude response compared to linear systems. Therefore, the nonlinear design of high-performance vibration energy capture systems has become a hot topic of research in this field. Based on the number of stable states in the system, vibration energy capture systems can be categorized as monostable, bistable, tristable, and multistable. Through the nonlinear design of vibration energy capture systems, energy capture from vibrations in various environments can be achieved, and the effective combination of vibration isolators and energy harvesters warrants further development.

[0005] In the prior art, the hydraulic cylinder achieves quasi-zero stiffness of the system, the ball slide carrier provides negative stiffness for the system, and the linear spring provides positive stiffness. However, due to the difficulty in curved surface machining, the machining difficulty and cost increase. Summary of the Invention

[0006] Technical issues to be solved:

[0007] In order to avoid the shortcomings of the existing technology, the present invention provides a quasi-zero stiffness vibration isolation and energy capture integrated device with a bionic double-wing vibrator structure. The double-wing vibrator structure is used to provide negative stiffness, thereby reducing the processing cost. It is innovative and practical, and the overall processing and manufacturing are convenient, and it is easy to commercialize. It can also capture vibration energy through electromagnetic conversion and provide it to other equipment that requires power supply. It can be applied to aerospace, rail transportation, mechanical processing and other aspects.

[0008] The technical solution of the present invention is: a quasi-zero stiffness vibration isolation and energy capture integrated device, comprising a main frame, a load-bearing platform, an electromechanical conversion unit, a double-wing vibrator structure and a positive stiffness module, wherein the load-bearing platform is mounted on the main frame via the double-wing vibrator structure and the positive stiffness module;

[0009] Negative stiffness is provided by the double-wing vibrator structure, and positive stiffness is provided by the positive stiffness module, and the combination of the two realizes quasi-zero stiffness vibration isolation; and vibration energy capture is completed by the electromechanical conversion unit.

[0010] A further technical solution of the present invention is: the double-wing vibrator structure includes a mass block, a first connecting member and a horizontal elastic unit, the mass block is installed below the load-bearing platform; the two horizontal elastic units are symmetrically hinged to the two sides of the mass block through the first connecting member;

[0011] The horizontal elastic unit includes a fixed end and a free end. The free end is hinged to the first connecting member. The free end can reciprocate in the horizontal direction under the push of the first connecting member.

[0012] A further technical solution of the present invention is: the horizontal elastic unit includes a horizontal guide rail, a horizontal spring and a horizontal slider, the horizontal guide rail is horizontally arranged on the main frame, one end of the horizontal spring is fixed on the main frame, and the other end is fixed on the horizontal slider, and the horizontal slider can perform reciprocating linear motion along the horizontal guide rail.

[0013] A further technical solution of the present invention is that the first connecting member is a first rigid connecting rod, which is hinged to the mass block and the horizontal slider respectively through lug structures provided at both ends.

[0014] A further technical solution of the present invention is that the positive stiffness module includes a vertical elastic unit and a central load-bearing elastic unit, the central load-bearing elastic unit is arranged directly below the load-bearing platform, and the load-bearing platform can perform vertical reciprocating motion under the support of the central load-bearing elastic unit;

[0015] The two groups of vertical elastic units are symmetrically arranged on both sides of the central load-bearing elastic unit. The bottom ends are fixed in the main frame, and the upper ends are free ends, which are hinged to the double-wing vibrator structure through the second connecting parts. The free ends can move back and forth in the vertical direction under the push of the second connecting parts.

[0016] A further technical solution of the present invention is: the vertical elastic unit includes a vertical guide rail, a vertical spring and a vertical slider, the vertical guide rail is fixed in the main frame along the vertical direction, one end of the vertical spring is fixed in the main frame, and the other end is fixed on the vertical slider, and the vertical slider can perform reciprocating linear motion along the vertical guide rail.

[0017] A further technical solution of the present invention is that the second connecting member is a second rigid connecting rod, which is hinged to the horizontal slider and the vertical slider respectively through lug structures provided at both ends.

[0018] A further technical solution of the present invention is: the electromechanical conversion unit is connected to the double-wing vibrator structure and the positive stiffness module, and includes a magnet and a coil, wherein the magnet is located inside the coil;

[0019] The conversion of vibration energy into electrical energy is achieved through the reciprocating motion of the magnet in the axial direction of the coil.

[0020] A further technical solution of the present invention is: the quasi-zero stiffness condition of the quasi-zero stiffness vibration isolation-energy capture integrated device is:

[0021]

[0022] Where k1 is the vertical spring stiffness, k2 is the horizontal spring stiffness, k3 is the load-bearing spring stiffness, a is the length of the first rigid link, b is the length of the second rigid link, c is the distance between the vertical guide rail and the central vertical guide rail, d is the distance between the horizontal guide rail and the vertical slider, g is the acceleration due to gravity, .

[0023] An application of a quasi-zero stiffness vibration isolation-energy harvesting integrated device, wherein the quasi-zero stiffness vibration isolation-energy harvesting integrated device is applied to mechanical processing, rail transportation, and aerospace, and can provide power for micro-electromechanical systems or embedded devices.

[0024] Beneficial effects

[0025] The beneficial effects of the present invention are as follows: In the device of the present invention, a dual-wing vibrator structure provides negative stiffness, while a positive stiffness module provides positive stiffness. The combination of the two achieves quasi-zero stiffness vibration isolation. The dual-wing vibrator structure adopts a biomimetic structure, which is simple and has excellent vibration isolation effect. An electromechanical conversion unit is connected to the dual-wing vibrator structure and the positive stiffness module to collect vibration energy from the dual-wing vibrator structure and the positive stiffness module, and convert the vibration energy into electrical energy through electromagnetic conversion.

[0026] Preferably, the positive stiffness module uses vertical elastic units and load-bearing springs to provide the system's positive stiffness, while the dual-wing vibrator structure uses horizontal elastic units to provide the system's negative stiffness. By adjusting the device's geometric parameters (a, b, c, d), the system achieves quasi-zero stiffness according to the quasi-zero stiffness condition formula, thereby achieving low-frequency vibration isolation.

[0027] The present invention has a simple structure and can be widely used in mechanical processing, rail transportation, aerospace and other fields to provide power for micro-electromechanical systems or embedded devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structural principle of a quasi-zero stiffness vibration isolation and energy capture integrated device according to the present invention;

[0029] Figure 2 is the restoring force F(y) curve of the vibration isolation device of the present invention under quasi-zero stiffness conditions;

[0030] Figure 3 This is the stiffness P(y) curve of the vibration isolation device of the present invention under quasi-zero stiffness conditions.

[0031] Explanation of the accompanying drawings: 1. Main frame, 2. Load-bearing platform, 3. Mass block, 4. Electromechanical conversion unit, 5. Load-bearing spring, 6. Central vertical guide rail, 7. Horizontal elastic unit, 8. Vertical elastic unit, 9. First rigid link, 10. Second rigid link; 41. Magnet, 42. Coil; 71. Horizontal guide rail, 72. Horizontal spring 72, 73. Horizontal slider; 81. Vertical guide rail, 82. Vertical spring, 83. Vertical slider. DETAILED DESCRIPTION

[0032] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] Reference Figure 1As described, in this embodiment, a quasi-zero stiffness vibration isolation and energy capture integrated device includes a main frame 1, a load-bearing platform 2, an electromechanical conversion unit 4, a double-wing vibrator structure and a positive stiffness module, and the load-bearing platform 2 is installed on the main frame 1 through the double-wing vibrator structure and the positive stiffness module;

[0035] Vibration energy is captured by the electromechanical conversion unit 4; negative stiffness is provided by the double-wing vibrator structure, and positive stiffness is provided by the positive stiffness module, and the combination of the two realizes quasi-zero stiffness vibration isolation.

[0036] Preferably, the double-wing vibrator structure includes a mass block 3, a first rigid link 9 and a horizontal elastic unit, and the mass block 3 is installed under the load-bearing platform 2; the two horizontal elastic units are symmetrically hinged on both sides of the mass block 3 through the first rigid link 9; the horizontal elastic unit includes a horizontal guide rail 71, a horizontal spring 72 and a horizontal slider 73, the horizontal guide rail 71 is horizontally arranged on the main frame 1, one end of the horizontal spring 72 is fixed on the main frame 1, and the other end is fixed on the horizontal slider 73. The horizontal slider 73 is pushed by the first rigid link 9 and performs reciprocating linear motion along the horizontal guide rail 71.

[0037] Preferably, the positive stiffness module includes a vertical elastic unit 8 and a central load-bearing elastic unit. The central load-bearing elastic unit is arranged directly below the load-bearing platform 2. The load-bearing platform 2 can perform vertical reciprocating motion under the support of the central load-bearing elastic unit.

[0038] The two groups of vertical elastic units 8 are symmetrically arranged on both sides of the central load-bearing elastic unit, including a vertical guide rail 81, a vertical spring 82 and a vertical slider 83. The vertical guide rail 81 is fixed in the main frame 1 along the vertical direction, one end of the vertical spring 82 is fixed in the main frame 1, and the other end is fixed on the vertical slider 83. The vertical slider 83 is hinged to the horizontal slider 73 through the second rigid link 10, and can reciprocate in the vertical direction under the push of the second rigid link 10.

[0039] Preferably, the electromechanical conversion unit is connected to the double-wing vibrator structure and the positive stiffness module, and includes a magnet and a coil, wherein the magnet is located inside the coil; the conversion of vibration energy into electrical energy is achieved through the reciprocating motion of the magnet in the axial direction of the coil.

[0040] Among them, the distance between the horizontal guide rail 71 and the vertical slider 83, the distance between the vertical guide rail 81 and the central vertical guide rail 6, and the length of the first rigid link 9 and the second rigid link 10 can all be adjusted.

[0041] By adjusting the geometric parameters, where: k1 is the stiffness of the vertical spring 82, k2 is the stiffness of the horizontal spring 72, k3 is the stiffness of the load-bearing spring 5, M is the mass of the load-bearing platform 2, the mass block 3, and the magnet 41, a is the length of the first rigid link 9, b is the length of the second rigid link 10, c is the distance between the vertical guide rail 81 and the central vertical guide rail 6, d is the distance between the horizontal guide rail 71 and the vertical slider 83, and g is the acceleration of gravity. . Make ;

[0042] When the vertical displacement of the load-bearing platform 2 is season , the load-bearing platform is The restoring force in the y direction is:

[0043] (1)

[0044] Stiffness P(y) is:

[0045] (2)

[0046] Therefore, the quasi-zero stiffness condition of the vibration isolation device is:

[0047] (3).

[0048] In this embodiment, a method for installing a quasi-zero stiffness vibration isolation and energy capture integrated device includes the following steps:

[0049] In the first step, the central vertical guide rail 6 is fixedly installed in the center of the main frame 1, the load-bearing spring 5 is sleeved on the central vertical guide rail 6, and the main frame 1 and the load-bearing spring 5 are fixedly connected.

[0050] The second step is to install the electromechanical conversion unit 4: the magnet 41 is placed on the central vertical guide rail 6, and the load-bearing spring 5 is fixedly connected to the magnet 41, and the coil 42 is arranged in the movement direction of the magnet 41.

[0051] In the third step, the mass block 3 is placed on the central vertical guide rail 6 and the mass block 3 is fixedly connected to the magnet 41 .

[0052] The fourth step is to securely connect the load-bearing platform 2 to the mass block 3 .

[0053] The fifth step is to install the horizontal elastic unit 7: install the horizontal guide rail 71 on the side wall of the main frame 1 so that the distance between the horizontal guide rail 71 and the vertical slider 83 can be adjusted, and sequentially put the horizontal spring 72 and the horizontal slider 73 on the horizontal guide rail 71, and then fix the horizontal spring 72 to the horizontal guide rail 71, and the horizontal spring 72 to the horizontal slider 73 in sequence.

[0054] Step 6. Install the vertical elastic unit 8: The vertical guide rail 81 is installed at the bottom of the main frame 1 so that the distance between the vertical guide rail 81 and the central vertical guide rail 6 can be adjusted. The vertical spring 82 and the vertical slider 83 are sequentially mounted on the vertical guide rail 81, and the vertical spring 82 and the vertical guide rail 81, and the vertical spring 82 and the vertical slider 83 are fixedly connected in turn.

[0055] In the seventh step, the horizontal slider 73 is hinged to the mass block 3 by the first rigid link 9, and the vertical slider 83 is hinged to the horizontal slider 73 by the second rigid link 10. When excitation is applied to the load-bearing platform 2, the quasi-zero-stiffness vibration isolation and energy capture integrated device starts to work.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A quasi-zero stiffness vibration isolation and energy capture integrated device, characterized by: It includes a main frame, a load-bearing platform, an electromechanical conversion unit, a double-wing vibrator structure and a positive stiffness module, wherein the load-bearing platform is mounted on the main frame through the double-wing vibrator structure and the positive stiffness module; The double-wing vibrator structure provides negative stiffness, and the positive stiffness module provides positive stiffness, and the combination of the two achieves quasi-zero stiffness vibration isolation; the electromechanical conversion unit achieves vibration energy capture; The dual-wing vibrator structure includes a mass block, a first connecting member, and a horizontal elastic unit. The mass block is installed below the load-bearing platform. Two horizontal elastic units are symmetrically hinged to the two sides of the mass block through the first connecting member. The horizontal elastic unit includes a fixed end and a free end. The free end is hinged to the first connecting member. The free end can reciprocate in the horizontal direction under the push of the first connecting member. The positive stiffness module includes a vertical elastic unit and a central load-bearing elastic unit. The central load-bearing elastic unit is arranged directly below the load-bearing platform. The load-bearing platform can perform reciprocating motion in the vertical direction under the support of the central load-bearing elastic unit. Two groups of vertical elastic units are symmetrically arranged on both sides of the central load-bearing elastic unit. The bottom ends are fixed in the main frame, and the upper ends are free ends, which are respectively hinged to the double-wing vibrator structure through the second connecting member. The free ends can reciprocate in the vertical direction under the push of the second connecting member. The electromechanical conversion unit is connected to the double-wing vibrator structure and the positive stiffness module, and includes a magnet and a coil, wherein the magnet is located inside the coil; the conversion of vibration energy into electrical energy is achieved through the reciprocating motion of the magnet in the axial direction of the coil.

2. The quasi-zero stiffness vibration isolation and energy capture integrated device according to claim 1, characterized in that: The horizontal elastic unit includes a horizontal guide rail, a horizontal spring and a horizontal slider. The horizontal guide rail is horizontally arranged on the main frame. One end of the horizontal spring is fixed to the main frame and the other end is fixed to the horizontal slider. The horizontal slider can perform reciprocating linear motion along the horizontal guide rail.

3. The quasi-zero stiffness vibration isolation and energy capture integrated device according to claim 2, characterized in that: The first connecting member is a first rigid connecting rod, which is hinged to the mass block and the horizontal sliding block respectively through lug structures provided at both ends.

4. The quasi-zero stiffness vibration isolation and energy capture integrated device according to claim 3, characterized in that: The vertical elastic unit includes a vertical guide rail, a vertical spring and a vertical slider. The vertical guide rail is fixed in the main frame along the vertical direction. One end of the vertical spring is fixed in the main frame and the other end is fixed on the vertical slider. The vertical slider can perform reciprocating linear motion along the vertical guide rail.

5. The quasi-zero stiffness vibration isolation and energy capture integrated device according to claim 4, characterized in that: The second connecting member is a second rigid connecting rod, which is hinged to the horizontal slider and the vertical slider respectively through lug structures provided at both ends.

6. The quasi-zero stiffness vibration isolation and energy capture integrated device according to claim 3 or 5, characterized in that: The quasi-zero stiffness condition of the quasi-zero stiffness vibration isolation-energy capture integrated device is: Where k1 is the vertical spring stiffness, k2 is the horizontal spring stiffness, k3 is the load-bearing spring stiffness, a is the length of the first rigid link, b is the length of the second rigid link, c is the distance between the vertical guide rail and the central vertical guide rail, d is the distance between the horizontal guide rail and the vertical slider, .

7. An application of the quasi-zero stiffness vibration isolation and energy capture integrated device according to any one of claims 1 to 6, characterized in that: The quasi-zero stiffness vibration isolation-energy capture integrated device is applied to mechanical processing, rail transportation, and aerospace, and can provide power for micro-electromechanical systems or embedded devices.

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