A variable stiffness multi-stable inerter type nonlinear energy sink vibration reduction device and a working method thereof

Abstract

The present application relates to a kind of variable stiffness multi-stable inertial capacity type nonlinear energy sink damping device and its working method, the device is by bottom plate, disc spring, loading head, core fixed cylinder, nylon washer, rubber center cylinder, mass block, screw rod, ball screw, flywheel and other components are constituted.By series-parallel disc spring element with negative stiffness characteristics, form multi-stable energy dissipation mechanism.Adjust the fastening degree of bolt and the position of fixed baffle on slide rail, the pre-press displacement of disc spring can be accurately controlled, and the nonlinear stiffness adjustment of device is realized.Inertial capacity element is formed by the combination design of ball screw drive system and flywheel, efficient energy conversion and inertia mass effect are realized, so as to significantly improve the damping effect and robustness of system.The present application has compact structure and excellent performance, and is suitable for complex vibration environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vibration control, in particular to a variable stiffness multi-stable inerter type nonlinear energy sink damping device based on a disc spring and a working method thereof. BACKGROUND

[0002] Effectively suppressing unwanted vibrations has always been an important challenge in the engineering field, especially in various mechanical equipment, building structures, aerospace, etc. Vibration problems not only affect the performance of the structure, but also can cause fatigue failure, shorten the service life of the equipment, and even safety accidents. Traditional damping technology mainly relies on linear dampers. Such systems are based on linear vibration theory and can effectively reduce vibrations within the design frequency range. However, factors such as structural degradation caused by external excitation effects, inaccurate damping design estimates, and structural modifications during service often cause the structure to deviate from the expected design. At the same time, when the system is subjected to complex excitation, especially multi-frequency or high-amplitude nonlinear vibration, the performance of traditional linear dampers is insufficient. In response to complex excitation, especially multi-frequency or high-amplitude nonlinear vibration, its effectiveness is hindered by tuning failure effects.

[0003] In order to solve the above limitations, nonlinear energy sink technology has gradually attracted attention. Nonlinear energy sink systems can effectively respond to the amplitude characteristics of external excitation in a wide frequency range by introducing high-order nonlinear terms. By utilizing transient resonance capture mechanisms and a series of modes of the main structure, significant energy exchange is induced, allowing energy to be transferred from low-frequency vibrations to high-frequency vibrations, and ultimately dissipated through the damping of the additional structure. However, traditional nonlinear energy sink devices have limitations such as high threshold energy transfer mechanisms, dependence on external excitation intensity and large mass ratio of the attached structure, and fixed nonlinear characteristics, which cannot flexibly adapt to multi-frequency vibrations and different amplitude changes in complex vibration environments. Therefore, developing a lightweight nonlinear energy sink damping device with variable stiffness characteristics has become a key to solving complex vibration problems.

[0004] In recent years, some research has proposed designing elastic elements with adjustable stiffness or introducing multi-stable mechanisms to improve the damping effect of nonlinear energy sinks. By mechanical adjustment, magnetic adjustment, or the application of smart materials, nonlinear energy sinks can adaptively adjust their stiffness and steady-state characteristics according to actual vibration conditions. However, these methods still face challenges such as insufficient adjustment accuracy, complex structure, high cost, etc. in practice, limiting their application in actual engineering. SUMMARY

[0005] The present application aims to provide a variable stiffness multi-stable inerter type nonlinear energy sink vibration damping device, which can effectively control vibrations of different frequencies and amplitudes by changing the stiffness and stable characteristics of the device. By integrating inerter elements, the vibration damping device is lightweight while providing sufficient inertia effect, improving the response speed and dynamic performance of the system, and optimizing the damping effect and system robustness.

[0006] In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] A variable stiffness multi-stable inerter type nonlinear energy sink vibration damping device comprises:

[0008] A bottom plate is fixed on a controlled structure, and one end of the bottom plate is provided with a connecting plate;

[0009] Two fixed baffles are oppositely arranged on the bottom plate through a distance adjusting assembly, and the distance adjusting assembly can adjust the distance between the two fixed baffles;

[0010] A nonlinear energy sink damping assembly composed of multiple groups of disc spring elements with negative stiffness characteristics is connected between the two fixed baffles, forming a multi-stable structure with multiple elastic jump behaviors;

[0011] A mass block is connected in series on the screw rod and located between the multiple groups of disc spring elements with negative stiffness characteristics, and the geometric center of one side of the mass block is fixedly connected with a ball screw rod, the free end of the ball screw rod passes through one of the fixed baffles, two fixed plates fixed on the bottom plate and arranged in parallel, and the vertical plate portion of the bottom plate in sequence, and a ball nut is installed on the free end of the ball screw rod between the two fixed plates; the outer periphery of the ball nut is provided with external teeth;

[0012] Two flywheels are symmetrically engaged on both sides of the ball nut;

[0013] Under the inertial thrust of the mass block, the ball screw rod can move along the axis, causing the ball nut to rotate, and in turn driving the two flywheels to rotate, generating inertial mass effect.

[0014] The nonlinear energy sink damping assembly comprises, in sequence along the force direction, coaxially connected:

[0015] A loading head is a disc-shaped assembly with a central hole, composed of an annular base and an annular constraint cylinder arranged coaxially, used to provide positioning and transmit external load during installation;

[0016] A core fixed cylinder is coaxially sleeved on the outside of the annular constraint cylinder;

[0017] A plurality of disc springs with the same direction are connected in parallel to form a disc spring group, which is coaxially sleeved on the outer wall of the core fixing cylinder, and the plurality of disc springs with the same direction are connected through inner washers and inner-outer washers, wherein the inner washers are arranged at the inner ring edge joints of the disc springs, and the inner-outer washers are coaxially arranged outside the inner washers, and by adjusting the diameter of the inner-outer washers, the disc springs with different parameters can be connected together to bear force together, reduce the moment and enlarge the output force.

[0018] Two groups of disc spring groups with opposite directions are symmetrically connected in series to form a disc spring damping assembly, and a rubber center cylinder is arranged at the center of the two groups of disc spring groups.

[0019] An outer washer is coaxially arranged outside the rubber center cylinder, so that the disc springs can be deformed sufficiently during compression, and the negative stiffness characteristic of the disc springs can be effectively exerted.

[0020] One end of the screw rod is fixedly connected with a fixed baffle on one side, the other end penetrates through the center of the mass block and at least one group of disc spring damping assemblies, and is fixedly connected with a fixed baffle on the other side of the bottom plate, to form a non-linear energy well damping assembly.

[0021] The screw rod is provided with threads at both ends, and the fixed connection with the fixed baffle is realized through the cooperation of the threads and the nuts.

[0022] A rectangular groove is arranged on the surface of the screw rod in the axial direction, and a guide protrusion capable of being inserted into the rectangular groove is arranged on the inner wall of the hole of the center hole of the mass block.

[0023] A through hole is arranged at the center of the screw rod, and the ball screw is fixed with the mass block through the through hole.

[0024] The distance adjusting assembly is a linear slide rail assembly, which comprises:

[0025] A slide rail is fixed on the bottom plate.

[0026] A sliding block is slidably arranged in the slide rail and can be fixed relative to the slide rail through a first bolt.

[0027] The bottom of the fixed baffle is connected with the sliding block through a second bolt.

[0028] The materials of the inner washers, the inner-outer washers and the outer washer are nylon materials, and the inner washers and the inner-outer washers are in contact with the disc springs in the form of a circumferential line.

[0029] The materials of the core fixing cylinder and the center cylinder are rubber materials.

[0030] The application further discloses a working method of the variable-stiffness multi-stable inerter type nonlinear energy sink vibration damping device,

[0031] When external environmental excitation acts on the controlled structure, the vibration damping device and the controlled structure produce instantaneous resonance, so that the mass block in the nonlinear energy sink damping assembly slides left and right along the screw rod; the sliding causes the disc spring to be compressed axially, and a nonlinear restoring force is generated; in this process, the internal balance state of the disc spring changes dramatically, accompanied by the release of strain energy and the redistribution of the internal structure, and the external input vibration energy is effectively dissipated through high-frequency extrusion of the rubber material and sliding friction;

[0032] Meanwhile, the linear motion of the mass block is converted into high-speed rotary motion of the flywheel through the ball screw transmission system fixed to the geometric center of the mass block, and an inertial mass effect far exceeding its own physical mass is generated;

[0033] By connecting and connecting the disc spring elements with negative stiffness characteristics, a multi-stable energy dissipation mechanism is formed, and the device realizes precise control of vibrations of different frequencies and amplitudes;

[0034] Through the distance adjusting assembly, the pre-compression displacement of the disc spring element is accurately adjusted, and the nonlinear stiffness adjustment of the device is realized;

[0035] The synergistic effect of the ball screw and the flywheel further enhances the inertial damping effect of the system, and significantly improves the vibration damping performance of the controlled structure and the overall stability of the system.

[0036] 1. The application combines disc springs with negative stiffness characteristics in series and parallel to construct a nonlinear energy sink with a sawtooth-shaped force-displacement curve. Different disc spring units have stiffness mutations due to elastic snap, causing the balance state of the disc springs inside the device to change dramatically, producing multi-stable characteristics. External input vibration energy is effectively dissipated through high-frequency extrusion of the rubber material and sliding friction. This design can provide efficient vibration control in a wider frequency and amplitude range, effectively dissipate vibration energy, and significantly improve the damping effect.

[0037] 2. The distance adjusting assembly can adjust the distance between the two fixed baffles, accurately adjust the pre-compression displacement of the disc spring, and flexibly adjust the nonlinear stiffness of the device, realizing the variable stiffness characteristic. The vibration damping device has stronger adaptability and can be optimized according to different working conditions.

[0038] 3. The application integrates inerter elements in the nonlinear energy sink device, and significantly enhances the inertial mass effect through the synergistic design of the ball screw and flywheel assembly. The inerter element utilizes its unique dynamic characteristics to provide additional dynamic stiffness and damping, achieving lightweight of the vibration damping device while significantly improving the overall damping effect.

[0039] 4. The core fixing cylinder and rubber center cylinder in the application are made of rubber material, which provides flexible fixing before the deformation of the disc spring and prevents the disc spring from slipping. At the same time, the transverse deformation of the inner and outer edges of the disc spring is not affected during the response process, ensuring the stability of the mechanical properties of the disc spring.

[0040] 5. The nylon inner gasket and nylon inner and outer gasket in the application are in contact with the disc spring in the form of a circular line, which reduces the influence of friction resistance and ensures the stability of the performance of the disc spring. At the same time, the flat diameter of the nylon inner and outer gasket can be adjusted to reduce the axial force moment of the disc spring and enlarge the output, optimizing the stress performance of the disc spring.

[0041] 6. The screw rod of the application is made of rigid material, with threads at both ends for constraining multiple disc spring elements. The surface of the screw rod is provided with a rectangular groove along the length direction, and a through hole is opened in the center, which can precisely cooperate with the mass block and ball screw assembly. The screw rod not only serves to connect the disc spring elements, but also serves as a sliding track for the mass block, while having the function of adjusting the pre-press displacement of the disc spring, integrating multiple functions in one.

[0042] 7. The slide rail system of the application is made of rigid material, which is stably fixed at any position of the slide rail by the bolts on the fixing block, and sealing blocks are provided at both ends to prevent the device from derailing. By adjusting the position of the fixing block, the pre-press displacement of the disc spring can be accurately adjusted.

[0043] 8. The material used in the application has low cost, simple structure, and is easy to install and maintain. The components can be realized by standard factory machining or 3D printing technology, and the material and specifications can be selected and adjusted according to different needs. The manufacturing process is simple, and has high practicality and adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a schematic diagram of the overall structure of the application;

[0045] Figure 2 is a schematic diagram of the top view structure of the application;

[0046] Figure 3 is a schematic diagram of the front view structure of the application;

[0047] Figure 4 is a schematic diagram of a single disc spring element of the application and a sectional view;

[0048] Figure 5 is a schematic diagram of a single disc spring structure of the application;

[0049] Figure 6 is a schematic diagram of a multiple disc spring element series-parallel structure of the application;

[0050] Figure 7 Figure 1 is a schematic diagram of the loading head component of the present application;

[0051] Figure 8 Figure 2 is a schematic diagram of the core fixing cylinder component of the present application;

[0052] Figure 9 Figure 3 is a schematic diagram of the rubber center cylinder component of the present application;

[0053] Figure 10 Figure 4 is a schematic diagram of the nylon inner and outer washer component of the present application;

[0054] Figure 11 Figure 5 is a schematic diagram of the nylon outer washer component of the present application;

[0055] Figure 12 Figure 6 is a schematic diagram and cross-sectional view of the screw structure of the present application;

[0056] Figure 13 Figure 7 is a schematic diagram of the mass and ball screw system of the present application.

[0057] Figure 14 Figure 8 is a schematic diagram of the fixed baffle component of the present application.

[0058] Figure 15 Figure 9 is a schematic diagram of the slide rail system component of the present application;

[0059] Figure 16 Figure 10 is a schematic diagram of the flywheel component of the present application.

[0060] Figure 17 Figure 11 is a schematic diagram of the fixed plate and sleeve rod component of the present application.

[0061] Figure 18 Figure 12 is a schematic diagram of the force displacement curve of a single disc spring.

[0062] Figure 19 Figure 13 is a schematic diagram of the force displacement curve of a single-sided damping device.

[0063] Figure 20 Figure 14 is a schematic diagram of the force displacement curve of a damping device under different pre-press displacements.

[0064] The reference signs are explained as follows:

[0065] 1. base plate; 2. disc spring; 3. loading head; 4. core fixing cylinder; 5. nylon inner washer; 6. nylon inner and outer washer; 7. nylon outer washer; 8. rubber center cylinder; 9. mass; 10. bolt; 11. screw; 12. slide rail; 13. fixed block; 14. sealing block; 15. fixed baffle; 16. flywheel; 17. ball screw; 18. fixed plate; 19. sleeve rod. DETAILED DESCRIPTION

[0066] In order to more clearly illustrate the purpose, technical solutions and advantages of the present application, the patent of the present application is described in detail below in combination with the drawings and examples. It should be noted that the specific examples described herein are only used to explain the present application, and do not limit the present application in any form.

[0067] The present embodiment discloses a variable stiffness multi-stable inerter type nonlinear energy sink damping device based on disc spring, as shown in Figures 1-17 The device is composed of a bottom plate 1, a nonlinear energy sink and an integrated inerter element. The nonlinear energy sink is constructed by 16 groups of disc spring elements through series and parallel connection, and each group of disc spring elements is composed of 3 disc springs 2 connected in series.

[0068] The bottom plate 1 is made of high-strength steel material in L shape, the horizontal part is used to fix the damping device on the controlled structure, and the vertical part is used to fix the ball screw 17 and the sleeve rod 19 of the inerter element.

[0069] The assembly method of a single group of disc spring elements is shown in Figure 4 The specific components include: a loading head 3 made of steel, the number is 1; a core fixing cylinder 4 and a rubber center cylinder 8, both of which are made of rubber material according to the size requirements of the matched components, and the number of each is 1; disc springs 2 made of steel, the number is 3; nylon inner gasket 5, nylon inner and outer gasket 6 and nylon outer gasket 7, all of which are manufactured by 3D printing technology, the number is 3, 2 and 1 respectively.

[0070] In the assembly process, the protruding annular constraint cylinder of the loading head 3 is inserted into the shaft hole of the annular base of the core fixing cylinder 4 to form a precise fit. The nylon inner gasket 5 is coaxially placed with the core fixing cylinder 4 and contacts with the annular base to ensure the stability of the structure. The disc springs 2 are arranged coaxially on the plug-in part of the core fixing cylinder in turn, and the inner edge of the disc spring contacts with the plug-in part of the core fixing cylinder. The disc springs are isolated and supported by the nylon inner gasket 5 and the nylon inner and outer gasket 6 to ensure that the disc spring maintains its designed performance under stress. The nylon inner gasket 5 and the nylon inner and outer gasket 6 are in contact with the disc springs 2 in the form of circumferential line, and are arranged coaxially with the core fixing cylinder 4 to provide rigid support and flexible constraint. The rubber center cylinder 8 has the same diameter as the inner edge of the disc spring 2, is located at the rightmost side of the single group of disc spring elements, and contacts with the inner edge of the disc spring. The nylon outer gasket 7 is coaxially arranged outside the rubber center cylinder 8, located at the right side of the rightmost disc spring 2. The above components jointly constitute a single group of disc spring elements.

[0071] The loading head 3 is precisely matched with the core fixing cylinder 4, the nylon inner gasket 5, the nylon inner and outer gasket 6, the nylon outer gasket 7 and the rubber center cylinder 8 to ensure that the whole structure is arranged along the same central axis.

[0072] The screw rod 11 is made of steel material, the diameter matches the center hole of the loading head 3, and both ends have a preset length of thread. The screw rod surface is provided with a rectangular groove along the length direction, and a through circular hole is opened in the center to cooperate with the mass block 9 and the ball screw 17. 16 groups of disc spring elements are arranged in series and parallel through the screw rod 11 to form a multi-stable energy dissipation mechanism. Figures 1-2 The non-linear energy sink is shown in the figure.

[0073] The auxiliary mass block 9 in the non-linear energy sink is made of steel material, and a circular opening with a trapezoidal groove is arranged in the center and connected with the threaded part of the ball screw 17 by welding. The mass block 9 is arranged between the 16 groups of disc spring elements symmetrically arranged at both ends, and the screw rod 11 penetrates the circular opening of the mass block 9, so that it can freely slide on the screw rod 11. The ball screw 17 is fixedly connected with the geometric center of the mass block 9, penetrates the reserved hole of the fixed baffle 15, and extends to the vertical part of the bottom plate 1, so as to ensure the stability and cooperation of the whole structure.

[0074] The fixed baffle 15 is made of steel material, and the flat plate part is provided with 4 bolt holes, which can stably install the fixed baffle 15 on the sliding rail 12. The vertical plate has two forms: one contains a single hole for fixing the screw rod 11; the other contains 3 holes for fixing the screw rod 11 and two sleeve rods 19.

[0075] The sliding rail 12 system includes 4 fixed blocks 13 and 2 sealing blocks 14, which are made of steel material, as shown in the figure. Figure 15 The fixed baffle 15 is fixed on the sliding rail 12 by the bolt 10 and the fixed block 13, and the sealing block 14 is used to prevent the assembly from being separated from the sliding rail. By adjusting the position of the fixed block 13 and the fixed baffle 15, the pre-pressed displacement of the disc spring can be set, so as to adjust the non-linear restoring force of the system.

[0076] The ball screw 17 is fixedly connected with the geometric center of the mass block 9, penetrates the reserved hole of the fixed baffle 15, and extends to the bottom plate 1, as shown in the figures. Figure 1 And 13 The ball of the ball screw 17 and the nut part are blocked by the fixed plate 18 to limit the displacement in the screw direction.

[0077] The flywheel 16 adopts a suitable size that can cooperate with the ball screw 17, and is fixed by the sleeve rod 19. The two ends are fixed on the fixed baffle 15 and the vertical plate of the bottom plate 1 by the bolt 10, so as to ensure the stability of the device. At the same time, the flywheel 16 and the nut of the ball screw 17 should be in the same plane. Under the action of the inertial thrust of the mass block 9, the ball screw 17 drives the fixed body of the two end flywheels 16 and the nut of the ball screw 17 to rotate, so as to make the structure have a large inertial mass.

[0078] The size of the flywheel 16 matches the ball screw 17 and is fixed on the fixed baffle 15 and the vertical part of the bottom plate 1 through the sleeve rod 19 to ensure the stability of the device during operation. The flywheel 16 is in the same plane as the nut of the ball screw 17. Under the inertial thrust of the mass block 9, the ball screw 17 drives the flywheel 16 at both ends to rotate, thereby producing a significant inertial mass effect, effectively improving the damping performance of the device while reducing the physical mass of the system.

[0079] To more clearly illustrate the mechanical properties and overall performance of the embodiment, Figures 18-20 Various force-displacement curve diagrams are shown to further illustrate the working principle and performance advantages of the device.

[0080] Figure 18 The force-displacement curve of a single disc spring with negative stiffness characteristics is shown. The curve reveals the unique mechanical performance of the disc spring under external force, especially its negative stiffness characteristics within a certain range. This negative stiffness effect is the core of the multi-stable damping mechanism of the invention, which can effectively absorb and dissipate external vibration energy by inducing elastic snap-through effect.

[0081] Figure 19 The force-displacement curve of a single-sided damping device formed by series and parallel connection of disc springs is shown. By combining disc springs with negative stiffness characteristics in series and parallel, a typical sawtooth force-displacement curve is formed. Due to the stiffness mutation of different disc spring units during elastic snap-through, the balance state inside the device changes dramatically, producing multi-stable characteristics. This design can efficiently dissipate external input vibration energy through high-frequency compression of rubber materials and sliding friction.

[0082] Figure 20 The force-displacement curve of the nonlinear energy well device under different pre-compression displacement conditions is shown. When the initial pre-compression displacement is small, the curve gradually shows segmented linear stiffness, and the system stiffness changes in stages with displacement. With the increase of pre-compression displacement, the system shows quasi-cubic stiffness characteristics, showing significant geometric nonlinear characteristics. The curve shows how to flexibly adjust the overall stiffness and multi-stable characteristics of the device by adjusting the pre-compression displacement of the disc spring. All results show significant hysteresis and excellent energy dissipation capacity.

[0083] The variable stiffness multi-stable inertial energy sink damping device is firmly installed on the controlled structure through the bottom plate 1. When the external environment excitation acts on the controlled structure, the damping device and the controlled structure produce instantaneous resonance, which promotes the mass block 9 of the non-linear energy sink to slide left and right along the screw 11. This sliding causes the axial compression of the disc spring 2, generating significant non-linear restoring force. In this process, the internal balance state of the disc spring 2 changes dramatically, accompanied by the release of strain energy and the redistribution of the internal structure, effectively dissipating the external input vibration energy through high-frequency extrusion of rubber material and sliding friction. At the same time, the linear motion of the mass block 9 is converted into the high-speed rotational motion of the flywheel 16 through the ball screw 17 transmission system fixed to the geometric center of the mass block 9, generating an inertial mass effect far exceeding its own physical mass. Through the series-parallel connection of disc spring elements with negative stiffness characteristics, a multi-stable energy dissipation mechanism is formed, and the device realizes precise control of vibrations of different frequencies and amplitudes. By adjusting the fastening degree of the adjusting bolt and the position of the fixed baffle 15 on the slide rail, the pre-compression displacement of the disc spring can be precisely controlled, and the non-linear stiffness adjustment of the device is realized. In addition, the synergistic effect of the ball screw 17 and the flywheel 16 further enhances the inertial damping effect of the system, significantly improving the damping performance of the controlled structure and the overall stability of the system.

[0084] The above examples are only used to illustrate the preferred embodiments of the present application, and do not limit the concept and scope of the present application. Various modifications and improvements made by those skilled in the art without departing from the design concept of the present application shall be included in the protection scope of the present application. The technical content claimed by the present application has been described in detail in the claims.

Claims

1. A method of operating a variable-stiffness, multi-stable, inerter-based, nonlinear energy sink vibration isolation device, the variable-stiffness, multi-stable, inerter-based, nonlinear energy sink vibration isolation device comprising: A bottom plate is fixed on the controlled structure, and one end of the bottom plate is provided with a connecting plate; Two fixed baffles are oppositely arranged on the bottom plate through a distance adjusting assembly, and the distance adjusting assembly can adjust the distance between the two fixed baffles; A non-linear energy well damping assembly composed of multiple groups of disc spring elements with negative stiffness characteristics is connected between the two fixed baffles, and forms a multi-stable structure with multiple elastic jump behaviors; A mass block is connected in series on the screw rod and located between the multiple groups of disc spring elements with negative stiffness characteristics, and the geometric center of one side of the mass block is fixedly connected with a ball screw, the free end of the ball screw passes through one of the fixed baffles, two fixed plates fixed on the bottom plate and arranged in parallel and the vertical plate portion of the bottom plate in sequence, and a ball nut is mounted on the free end of the ball screw between the two fixed plates; Two flywheels are symmetrically engaged on both sides of the ball nut and engaged with the external teeth on the ball nut; Under the inertial thrust of the mass block, the ball screw can move along the axis to rotate the ball nut, and the rotation of the ball nut drives the rotation of the two flywheels to generate inertial mass effect; The device is characterized in that when external environmental excitation acts on the controlled structure, the damping device and the controlled structure produce instantaneous resonance, which promotes the mass block in the non-linear energy well damping assembly to slide left and right along the screw rod; this sliding causes the axial compression of the disc spring, generating a non-linear restoring force; in this process, the internal balance state of the disc spring changes dramatically, accompanied by the release of strain energy and the redistribution of the internal structure, effectively dissipating the external input vibration energy through high-frequency extrusion of rubber materials and sliding friction; At the same time, the linear motion of the mass block is converted into high-speed rotary motion of the flywheel through the ball screw transmission system fixedly connected with the geometric center of the mass block, generating an inertial mass effect far exceeding its own physical mass; By connecting the disc spring elements with negative stiffness characteristics in series and parallel, a multi-stable energy dissipation mechanism is formed, and the device realizes precise control of vibrations of different frequencies and amplitudes; Through the distance adjusting assembly, the pre-compression displacement of the disc spring element is precisely controlled, and the non-linear stiffness adjustment of the device is realized; The synergistic effect of the ball screw and the flywheel further enhances the inertial damping effect of the system, significantly improving the damping performance of the controlled structure and the overall stability of the system; The non-linear energy well damping assembly comprises, in sequence along the force direction: a loading head, which is a disc-shaped assembly with a central hole, composed of an annular base and a coaxially arranged annular constraint cylinder, used for positioning and transmitting external load during installation; A core fixing cylinder is coaxially connected to the outer side of the annular constraint cylinder; A plurality of disc springs with the same direction are connected in parallel to form a disc spring group, which is coaxially sleeved on the outer wall of the core fixing cylinder, and the plurality of disc springs with the same direction are connected through inner washers and inner-outer washers, wherein the inner washers are arranged at the inner ring edge joints of the disc springs, and the inner-outer washers are coaxially arranged outside the inner washers, and by adjusting the diameter of the inner-outer washers, the disc springs with different parameters can be connected together to bear force together, reduce the moment and enlarge the output. Two groups of disc spring groups with opposite directions are symmetrically connected in series around the center cylinder to form a disc spring damping assembly, the center cylinder is an annular element with a through hole in the middle, and the two ends of the center cylinder are in contact with the inner ring edges of the adjacent two disc springs. An outer washer is coaxially arranged outside the center cylinder, so that the disc springs can be fully deformed during compression, and the negative stiffness characteristics of the disc springs can be effectively exerted. One end of the screw rod is fixedly connected with the fixed baffle on one side, the other end penetrates through at least one group of disc spring damping assemblies, the center of the mass block and at least another group of disc spring damping assemblies, and is fixedly connected with the fixed baffle on the other side of the bottom plate, forming a non-linear energy well damping assembly. The distance adjusting assembly is a linear slide rail assembly, which comprises a slide rail fixed on the bottom plate. A sliding block is arranged in the slide rail and can be fixed relative to the slide rail through a first bolt. The bottom of the fixed baffle is connected with the sliding block through a second bolt.

2. The method of operating a variable-stiffness, multi-stable, inerter-based non-linear energy sink vibration isolation device according to claim 1, wherein, The two ends of the screw rod are provided with threads, and the fixed connection with the fixed baffle is realized through the cooperation of threads and nuts. A rectangular groove is arranged on the surface of the screw rod in the axial direction, and a guide protrusion capable of being inserted into the rectangular groove is arranged on the inner wall of the center hole of the mass block. A through hole is arranged in the center of the screw rod, and the ball screw is fixed with the mass block through the through hole.

3. The method of operating a variable-stiffness, multi-stable, inerter-based non-linear energy sink vibration isolation device of claim 1, wherein, The materials of the inner washer, the inner-outer washer and the outer washer are nylon materials, and the inner washer and the inner-outer washer are in contact with the disc springs in the form of a circumferential line.

4. The method of operating a variable-stiffness, multi-stable, inerter-based non-linear energy sink vibration isolation device of claim 1, wherein, The materials of the core fixing cylinder and the center cylinder are rubber materials.

Images