Roller-concave plate type variable stiffness self-adaptive vibration isolation device with auxiliary mass

Abstract

The present application relates to a kind of variable stiffness self-adaptive vibration isolation devices of roller-concave plate type with auxiliary mass, including auxiliary mass mechanism unit and variable stiffness mechanism unit;Auxiliary mass mechanism unit includes multiple pairs of auxiliary mass rotating nut, auxiliary mass rotating nut is sleeved on rotating screw, two connecting rods are connected between rotating screw and main body bar, baffle is provided on rotating screw, rotating spring is connected between auxiliary mass rotating nut and baffle;Variable stiffness mechanism unit includes hexagonal structure and roller-concave plate structure, hexagonal structure includes six main body bars, spring is connected between main body bar, roller-concave plate structure includes concave plate, spring and roller, spring is connected between roller and main body bar.Compared with prior art, the present application can provide nonlinear enhanced inertia control force and variable stiffness restoring force related to deformation amplitude, speed and acceleration for the isolated structure, especially can realize the synergistic control effect of vibration isolation and deformation in the deformation stage.

Description

Technical Field

[0001] This invention belongs to the technical field of vibration isolators for civil engineering structures, and relates to a roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass. Background Technology

[0002] Modern building structures tend to be larger and more complex, with lower stiffness and greater flexibility. The vibration frequencies of these structures have also shifted to lower frequencies, exhibiting larger amplitudes compared to higher frequencies. Linear vibration isolation theory indicates that only when the excitation frequency is greater than... The system only achieves vibration isolation when the frequency is twice the natural frequency. Based on existing linear theory optimization methods that rely on the linear relationship between load and deformation, reducing the isolation frequency of the vibration isolator to the low-frequency range requires reducing the stiffness of the isolation structure. This leads to a decrease in the structural load-bearing capacity, and the large amplitude vibrations during vibration isolation can also cause fatigue damage to the structure. Increasing the damping and reducing the resonance peak value will also worsen the vibration isolation effect in the high-frequency range.

[0003] Based on existing technological requirements, researchers have designed vibration isolators with nonlinear relationships, meaning that the load and deformation exhibit a nonlinear relationship. The main research directions for achieving nonlinearity include geometric nonlinearity and material nonlinearity. Geometric nonlinearity uses biomimetic techniques to mimic animal bones and muscles to create vibration isolation devices with nonlinear relationships, such as limb-like structures; scissor-shaped structures are a special type of symmetrical configuration. Material nonlinearity utilizes nonlinear materials to achieve nonlinear functions, mainly including shape memory alloys and bistable composite plates. Currently, some researchers are combining the two nonlinearity methods, replacing the linear spring units in geometric nonlinearity with nonlinear materials, which is also an emerging research direction.

[0004] Biomimetic vibration isolators, as an emerging development direction in vibration isolators, mainly involve studying the nonlinear characteristics of biological structures that are favorable to excitation forces and using industrial equipment to simulate the nonlinear structures of organisms. Most existing research focuses on the invention, improvement, and practical application of single stiffness, damping, or mass parameters, and there is a severe lack of composite vibration isolators that utilize multiple mechanisms for synergistic enhancement. With the discovery and biomimetic application of more biological vibration isolation structures, the future research prospects remain promising.

[0005] Vibration isolators play a significant role in vibration isolation in fields such as aerospace, automotive engineering, shipbuilding, large building structures, and precision instrument manufacturing. However, existing vibration isolation design research methods have shortcomings under conditions such as ultra-low frequency, large deformation, and large inertia.

[0006] Patent CN236048327A discloses an impact-resistant vibration isolator with synchronous adjustment of damping and stiffness, comprising a shell, an upper cover and a lower cover fixedly mounted at the upper and lower ends of the shell, a guide post fixedly mounted on the shell, a lifting sleeve slidably mounted on the guide post, and a vibration isolation platform fixedly mounted on the lifting sleeve; a variable damping module is also slidably mounted on the guide post, and the shell interior is also equipped with a variable stiffness module A and a variable stiffness module B symmetrical about the guide post; the variable damping module includes a pressure plate A, a pressure plate B, a metal tensile and compressive helical spring, a connecting rod A, a connecting rod C, a connecting rod B, and a connecting rod D, and two symmetrically mounted damping blocks. However, although this patent has variable stiffness and variable damping mechanisms, the stiffness adjustment of this patent only increases synchronously with the increase of external impact, and cannot achieve customizable nonlinear restoring force and inertial control force amplification, and is not highly sensitive to micro-vibrations.

[0007] Patent CN365729431U discloses a novel insect-inspired low-frequency vibration isolation structure, comprising an upper and lower base plate that achieve relative vertical motion via a vertically oriented guiding structure, a series of rhomboid structures installed between the upper and lower base plates to apply restoring forces, and a horizontally oriented guiding structure connected in series with the series of rhomboid structures to increase nonlinear inertial forces and nonlinear damping forces on the upper and lower base plates. However, the small rhomboid structures added to the rhomboid structure in this patent operate on the same mechanism as the main rhomboid structure, only adding a means of adjusting the nonlinear restoring force, and failing to provide an auxiliary mass amplification mechanism. Summary of the Invention

[0008] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass. This invention can provide the vibration-isolated structure with nonlinear enhanced inertial control force and variable stiffness restoring force related to deformation amplitude, velocity and acceleration, and can especially achieve vibration isolation enhancement and vibration isolation deformation synergistic control effect during the deformation stage.

[0009] The objective of this invention can be achieved through the following technical solutions:

[0010] One of the technical solutions of the present invention is to provide a roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass. The device includes an auxiliary mass mechanism unit and a variable stiffness mechanism unit. The upper part of the device is connected to an upper platform, and the lower part is connected to a lower platform.

[0011] The auxiliary mass mechanism unit includes multiple pairs of auxiliary mass rotating nuts. One pair of auxiliary mass rotating nuts is sleeved on both sides of the rotating screw. Two connecting rods are connected between the two sides of the rotating screw and the main rod. A pair of baffles are provided at both ends of the rotating screw. A rotating spring is connected between the auxiliary mass rotating nuts and the baffles. When the device is activated and vertical displacement occurs, the pair of auxiliary mass rotating nuts will rotate clockwise or counterclockwise simultaneously following the rotating screw, forming a rotating unit. At the same time, the auxiliary mass rotating nuts will rotate around the thread according to the rotation speed of the rotating screw. The rotation of the auxiliary mass rotating nuts can increase the inertial force they can provide. The external baffles and springs will ensure that the auxiliary mass rotating nuts can return to their original positions after the activation of the device, thus playing the role of auxiliary mass amplification and inertial enhancement to provide enhanced inertial control force. Without reducing the longitudinal bearing capacity of the vibration isolator, it provides amplified nonlinear inertial mass. This inertial mass is related to the deformation amplitude, velocity, and acceleration, and can effectively extend the vibration isolation period.

[0012] The variable stiffness mechanism unit includes a hexagonal structure and a roller-concave plate structure. The hexagonal structure includes six main rods, with variable stiffness springs connected at the joints. These variable stiffness springs act as linear spring units, exhibiting a linear relationship between restoring force and displacement in the horizontal direction. The hexagonal structure provides non-linear adjustment of the linear spring stiffness. The roller-concave plate structure includes a concave plate, a spring, and a roller. A spring connects the roller to the main rod, and the roller contacts the surface of the concave plate. The concave plate is connected to a lower platform. The pre-compressed spring... The roller moves on the concave plate, the surface of which has a curved shape. When the device performs vibration isolation, it is displaced in the vertical direction, and the roller also contacts the surface of the concave plate at different positions in the vertical direction. The different curved shapes of the concave plate surface allow the spring to generate different restoring forces, resulting in a customizable nonlinear force. The roller-concave plate structure can achieve vibration isolation for different working conditions by adjusting parameters under various complex circumstances. The parallel connection of the hexagonal structure and the roller-concave plate structure achieves the complementary effect of two nonlinear stiffnesses in the variable space.

[0013] As a preferred technical solution, the upper platform is the main structural body, i.e., the installation end, and the lower platform is the ground.

[0014] Furthermore, the main body members include a first main body member, a second main body member, a third main body member, a fourth main body member, a fifth main body member, and a sixth main body member. The upper part of the device is connected to the upper platform through the first main body member, and the lower part is connected to the lower platform through the fourth main body member.

[0015] Furthermore, a variable stiffness spring is connected between the connection point of the second main body member and the third main body member and the connection point of the fifth main body member and the sixth main body member.

[0016] Further, the auxiliary mass includes a first auxiliary mass rotating nut and a second auxiliary mass rotating nut, the rotating screw includes a first rotating screw, the connecting rod includes a first connecting rod and a second connecting rod, the baffle includes a first baffle and a second baffle, and the rotating spring includes a first rotating spring and a second rotating spring. The first auxiliary mass rotating nut and the second auxiliary mass rotating nut are sleeved on both sides of the first rotating screw. A first connecting rod is connected between one side of the first rotating screw and the connection point of the second main rod and the third main rod, and a second connecting rod is connected between the other side of the first rotating screw and the connection point of the fifth main rod and the sixth main rod. A first baffle and a second baffle are provided at both ends of the first rotating screw. A first rotating spring is connected between the first auxiliary mass rotating nut and the first baffle, and a second rotating spring is connected between the second auxiliary mass rotating nut and the second baffle.

[0017] Furthermore, the auxiliary mass rotating nut further includes a pair of third auxiliary mass rotating nuts and a fourth auxiliary mass rotating nut, the rotating screw further includes a second rotating screw, the connecting rod further includes a third connecting rod and a fourth connecting rod, the baffle further includes a third baffle and a fourth baffle, and the rotating spring further includes a third rotating spring and a fourth rotating spring.

[0018] Furthermore, the third auxiliary mass rotating nut and the fourth auxiliary mass rotating nut are sleeved on both sides of the second rotating screw. A third connecting rod is connected between one side of the second rotating screw and the connection point between the second main rod and the third main rod, and a fourth connecting rod is connected between the other side and the connection point between the fifth main rod and the sixth main rod. A third baffle and a fourth baffle are provided at both ends of the second rotating screw. A third rotating spring is connected between the third auxiliary mass rotating nut and the third baffle, and a fourth rotating spring is connected between the fourth auxiliary mass rotating nut and the fourth baffle.

[0019] Furthermore, the roller-concave plate structure also includes a cylinder, in which the spring moves. When the device performs vibration isolation, the cylinder constrains the spring and the roller to remain horizontal.

[0020] Furthermore, the concave plate includes a first concave plate and a second concave plate, and the roller includes a first roller and a second roller. The first roller is in contact with the surface of the first concave plate, and the second roller is in contact with the surface of the second concave plate. The first concave plate and the second concave plate are connected to the ground.

[0021] Furthermore, the spring includes a first spring and a second spring, the cylinder includes a first cylinder and a second cylinder, the first spring is connected between the first roller and the connection between the second main body member and the third main body member, the second spring is connected between the second roller and the connection between the fifth main body member and the sixth main body member, the first spring moves within the first cylinder, and the second spring moves within the second cylinder.

[0022] Furthermore, the surface of the concave plate adopts a curved shape, which, according to design requirements, includes an arc, a catenary, or a trigonometric function line.

[0023] As a preferred technical solution, according to design requirements, the materials of the rod, rotating screw, auxiliary mass rotating nut, baffle, concave plate, cylinder, and roller include aluminum alloy or alloy steel.

[0024] As a preferred technical solution, according to design requirements, the material of the spring includes carbon spring steel, low manganese spring steel, or chromium vanadium steel.

[0025] As a preferred technical solution, all the rods are connected by hinges. Considering the influence of rotational damping, the connection interfaces of the rods are all connected by connectors. The connectors at the connection points of the first main rod, the second main rod, and the sixth main rod, as well as the connection points of the fourth main rod, the third main rod, and the fifth main rod, are all connected by bearings.

[0026] As a preferred technical solution, in order to avoid mutual interference between the main body rods, variable stiffness springs and multiple pairs of rotating screws due to their installation positions, the main body rods, variable stiffness springs and rotating screws are connected in parallel. The connecting parts at the connection between the second and third main body rods, and at the connection between the fifth and sixth main body rods, adopt a combination of bearings and long rods.

[0027] As a preferred technical solution, the auxiliary mass rotating nut and rotating spring can be flexibly adjusted according to design requirements to ensure that the nonlinear inertial mass provided by the auxiliary mass rotating nut meets the vibration isolation frequency requirements.

[0028] This invention relates to a nonlinear vibration isolator based on geometric nonlinearity. Current geometric nonlinear vibration isolators can be mainly classified into three types: variable stiffness adjustment mechanism, auxiliary mass adjustment mechanism, and damping adjustment mechanism. Since this invention combines variable stiffness and auxiliary mass mechanisms, only the research status of the first two will be introduced. The variable stiffness adjustment mechanism achieves stiffness adjustment by mimicking the vibration isolation mechanism of animals, mainly through limb-like structures, biomimetic polygonal structures, and K-type spring structures. In recent years, researchers have proposed adjustable template stiffness structures to achieve variable stiffness, and this invention references these. The auxiliary mass adjustment mechanism adds auxiliary mass, and the vibration isolation effect is achieved by providing inertial force through the swinging of the auxiliary mass. Current research directions mainly include vibration isolators constructed using cantilever beams mimicking the middle ear, lever-type and swing-type vibration isolators mimicking the swinging of a human arm, and rotary vibration isolators that utilize mechanical structures such as flywheels to amplify the auxiliary mass effect.

[0029] This invention employs an auxiliary mass adjustment mechanism coupled with a hexagonal structure, while incorporating a roller-concave plate structure to provide adjustable stiffness. Compared to classic vibration isolation platforms, the vibration isolation platform provided by this invention couples the auxiliary mass mechanism and the stiffness adjustment mechanism. The auxiliary mass mechanism provides displacement-related nonlinear inertial effects for the vibration isolation platform; the stiffness adjustment mechanism provides customizable restoring force. This coupling allows the invention to provide nonlinearly enhanced inertial control force and vibration isolation effect when the isolated structure undergoes large deformations. The phase difference between the inertial control force and the vibration isolation restoring force controls the deformation of the isolation layer in the variable stiffness bionic vibration isolation device. The parameters in this invention can be customized and adjusted based on different application scenarios, thus having a wider range of applications. This invention is simple and clear in design, convenient and flexible in setup, and has high research and application value.

[0030] Based on the principle and configuration of biomimetic vibration isolation, this invention not only has the characteristics of high static and low dynamic, but also, due to its simple and adjustable parameters and passive vibration isolation method that does not require external energy, it is also suitable for use in a variety of complex working conditions.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The main part of the present invention includes an auxiliary mass mechanism unit and a variable stiffness mechanism unit. The auxiliary mass mechanism unit uses the auxiliary mass rotating nut and lever effect to provide nonlinear amplification of the equivalent mass, providing displacement-related nonlinear inertial control effect for the vibration isolation device platform, and quantitatively amplifying the equivalent nonlinear inertial mass by means of lever amplification effect and adjustment of auxiliary mass coefficient, extending the equivalent vibration isolation period of the vibration isolation device, and improving its adaptability to large deformation vibration control through nonlinear inertia, that is, simultaneously achieving vibration isolation efficiency enhancement and vibration isolation deformation control;

[0033] (2) The hexagonal structure involved in the variable stiffness mechanism unit of the present invention is based on the biomimicry of the spinal ligament, which can make full use of geometric space to achieve low-frequency nonlinear vibration isolation effect, and provides a variable and adjustable hexagonal structure to meet the flexible adjustment of the restoring force and deformation nonlinear relationship.

[0034] (3) The roller-concave plate structure and spring involved in the variable stiffness mechanism unit of the present invention jointly simulate the structure of the ligamentum flavum in the human body. The variable stiffness restoring force characteristics are provided by the restoring force generated in the horizontal direction by the roller and the pre-compressed spring when the roller is offset from the equilibrium position. The nonlinear restoring force of the spring can be customized according to the curve shape of the concave plate surface. It has high sensitivity to micro-vibration. In a large deformation range, it provides a nonlinear low stiffness effect with the help of the roller-concave plate structure and auxiliary mass mechanism. It improves the vibration isolation effect in the low frequency region without weakening the vertical bearing capacity of the vibration isolator. This structure can achieve vibration isolation for different working conditions by adjusting the parameters under various complex conditions. The displacement at both ends of the roller and the spring makes the structural parameters easier to adjust and apply.

[0035] (4) This invention provides a nonlinear vibration isolation mechanism based on the parallel coupling of roller-concave plate structure and hexagonal structure. It can not only customize the nonlinear stiffness complementary effect in the deformable region, but also introduce an auxiliary mass amplification adjustment mechanism based on levers to effectively amplify the equivalent mass of the isolated structure. The joint use of the nonlinear vibration isolation mechanism and the nonlinear inertia mechanism can significantly reduce the vibration isolation frequency without weakening the vertical bearing capacity of the vibration isolator, satisfying the vibration isolation efficiency and vibration isolation deformation control effect under large amplitude vibration isolation conditions. Furthermore, the phase difference between the inertial control force and the vibration isolation restoring force is used to control the deformation of the vibration isolation layer of the variable stiffness bionic vibration isolation device.

[0036] (5) The device of the present invention is convenient and flexible to set up and has good promotion and application value. It can be used as a unit to couple with other structures, such as with Stewart platform, to achieve multi-directional vibration isolation effect. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural schematic diagram of the roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass in Embodiment 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the main structure of the roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass in Embodiment 2 of the present invention;

[0039] Figure 3 This is a top view of the roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass in Embodiment 2 of the present invention.

[0040] Figure 4This is a detailed structural diagram of the roller-concave plate structure in an embodiment of the present invention.

[0041] Explanation of markings in the diagram:

[0042] 1—First main member, 2—Second main member, 3—Third main member, 4—Fourth main member, 5—Fifth main member, 6—Sixth main member, 7—Variable stiffness spring, 8—First rotating screw, 9—First auxiliary mass rotating nut, 10—Second auxiliary mass rotating nut, 11—First rotating spring, 12—Second rotating spring, 13—First baffle, 14—Second baffle, 15—Second rotating screw, 16—Third auxiliary mass rotating nut, 17—Fourth auxiliary mass 18—Third rotating spring, 19—Fourth rotating spring, 20—Third baffle, 21—Fourth baffle, 22—First connecting rod, 23—Second connecting rod, 24—Third connecting rod, 25—Fourth connecting rod, 26—First concave plate, 27—Second concave plate, 28—First cylinder, 29—Second cylinder, 30—First spring, 31—Second spring, 32—First roller, 33—Second roller, 34—Upper platform, 35—Lower platform, 36—Connector. Detailed Implementation

[0043] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and do not imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Example 1:

[0047] A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass, such as Figure 1 As shown, it includes an auxiliary mass mechanism unit and a variable stiffness mechanism unit. The upper part of the device is connected to the upper platform 34 (the main structure, i.e., the installation end), and the lower part is connected to the lower platform 35 (the ground).

[0048] The auxiliary mass mechanism unit includes multiple pairs of auxiliary mass rotating nuts. One pair of auxiliary mass rotating nuts is sleeved on both sides of the rotating screw. Two connecting rods connect the two sides of the rotating screw to the main rod. A pair of baffles are set at both ends of the rotating screw. A rotating spring connects the auxiliary mass rotating nuts and the baffles. When the device is activated and vertical displacement occurs, the pair of auxiliary mass rotating nuts will rotate clockwise or counterclockwise simultaneously with the rotating screw, forming a rotating unit. At the same time, the auxiliary mass rotating nuts will rotate around the thread according to the rotation speed of the rotating screw. The rotation of the auxiliary mass rotating nuts can increase the inertial force they can provide. The external baffles and springs will ensure that the auxiliary mass rotating nuts can return to their original positions after the activation of the device. This will play the role of amplifying auxiliary mass and enhancing inertia to provide enhanced inertial control force. It provides amplified nonlinear inertial mass without reducing the longitudinal bearing capacity of the vibration isolator. This inertial mass is related to the deformation amplitude, velocity, and acceleration, and can effectively extend the vibration isolation period.

[0049] The variable stiffness mechanism unit includes a hexagonal structure and a roller-concave plate structure. The hexagonal structure includes six main rods, with variable stiffness springs 7 connected between the main rods. The variable stiffness springs 7, as linear spring units, have a linear relationship between restoring force and displacement in the horizontal direction. The hexagonal structure provides nonlinear adjustment of the stiffness of the linear spring. The roller-concave plate structure includes a concave plate, a spring, and a roller. The spring is connected between the roller and the main rod, and the roller contacts the surface of the concave plate. The concave plate is connected to the ground. The pre-compressed spring causes the roller to move on the concave plate. The surface of the concave plate has a curved shape. When the device performs vibration isolation, the device is displaced in the vertical direction, and the roller also contacts the surface of the concave plate at different positions in the vertical direction. The different curve shapes of the concave plate surface can cause the spring to generate different restoring forces, making the spring generate customizable nonlinear forces. The roller-concave plate structure can achieve vibration isolation for different working conditions by adjusting parameters under various complex conditions. The parallel connection of the hexagonal structure and the roller-concave plate structure realizes the complementary effect of two nonlinear stiffnesses in the variable space.

[0050] The main components include a first main component 1, a second main component 2, a third main component 3, a fourth main component 4, a fifth main component 5, and a sixth main component 6. The upper part of the device is connected to the main structure through the first main component 1, and the lower part is connected to the ground through the fourth main component 4. A variable stiffness spring 7 is connected between the connection point of the second main component 2 and the third main component 3 and the connection point of the fifth main component 5 and the sixth main component 6.

[0051] In this embodiment, the auxiliary mass rotating nut includes a pair of first auxiliary mass rotating nuts 9 and second auxiliary mass rotating nuts 10, the rotating screw includes a first rotating screw 8, the connecting rods include a first connecting rod 22 and a second connecting rod 23, the baffles include a first baffle 13 and a second baffle 14, and the rotating springs include a first rotating spring 11 and a second rotating spring 12. The first auxiliary mass rotating nuts 9 and the second auxiliary mass rotating nuts 10 are sleeved on both sides of the first rotating screw 8. The first connecting rod 22 is connected between one side of the first rotating screw 8 and the connection between the second main rod 2 and the third main rod 3, and the second connecting rod 23 is connected between the other side of the first rotating screw 8 and the connection between the fifth main rod 5 and the sixth main rod 6. The first baffle 13 and the second baffle 14 are provided at both ends of the first rotating screw 8. The first rotating spring 11 is connected between the first auxiliary mass rotating nut 9 and the first baffle 13, and the second rotating spring 12 is connected between the second auxiliary mass rotating nut 10 and the second baffle 14.

[0052] like Figure 4 As shown, the roller-concave plate structure also includes a cylinder, in which the spring moves. When the device plays a vibration isolation role, the cylinder constrains the spring and the roller to remain horizontal.

[0053] The surface of the concave plate is curved. The curve shape can be selected from arc, catenary or trigonometric function line according to the design requirements. In this embodiment, an arc is preferred.

[0054] The concave plate includes a first concave plate 26 and a second concave plate 27; the spring includes a first spring 30 and a second spring 31; the roller includes a first roller 32 and a second roller 33; the cylinder includes a first cylinder 28 and a second cylinder 29; the first spring 30 is connected between the first roller 32 and the connection between the second main rod 2 and the third main rod 3; the second spring 31 is connected between the second roller 33 and the connection between the fifth main rod 5 and the sixth main rod 6; the first spring 30 moves within the first cylinder 28; the second spring 31 moves within the second cylinder 29; the first roller 32 is in contact with the surface of the first concave plate 26; the second roller 33 is in contact with the surface of the second concave plate 27; and the first concave plate 26 and the second concave plate 27 are connected to the ground.

[0055] Example 2:

[0056] A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass, such as Figure 2 and Figure 3As shown, it is basically the same as Embodiment 1, except that the auxiliary mass rotating nut includes a pair of first auxiliary mass rotating nuts 9 and second auxiliary mass rotating nuts 10, and a pair of third auxiliary mass rotating nuts 16 and fourth auxiliary mass rotating nuts 17; the rotating screw includes a first rotating screw 8 and a second rotating screw 15; the connecting rod includes a first connecting rod 22 and a second connecting rod 23, and a third connecting rod 24 and a fourth connecting rod 25; the baffle includes a first baffle 13 and a second baffle 14, and a third baffle 20 and a fourth baffle 21; the rotating spring includes a first rotating spring 11 and a second rotating spring 12, and a third rotating spring 18 and a fourth rotating spring 19; the first auxiliary mass rotating nuts 9 and 10 are sleeved on both sides of the first rotating screw 8; the third auxiliary mass rotating nuts 16 and 17 are sleeved on both sides of the second rotating screw 15; and one side of the first rotating screw 8 is connected to the second auxiliary mass rotating nut 15. A first connecting rod 22 is connected between the connection point of the main rod 2 and the third main rod 3, and a second connecting rod 23 is connected between the other side of the connection point of the fifth main rod 5 and the sixth main rod 6. A third connecting rod 24 is connected between one side of the second rotating screw 15 and the connection point of the second main rod 2 and the third main rod 3, and a fourth connecting rod 25 is connected between the other side of the second rotating screw 15 and the connection point of the fifth main rod 5 and the sixth main rod 6. A first baffle 13 and a second baffle 14 are provided at both ends of the first rotating screw 8, and a third baffle 20 and a fourth baffle 21 are provided at both ends of the second rotating screw 15. A first rotating spring 11 is connected between the first auxiliary mass rotating nut 9 and the first baffle 13, a second rotating spring 12 is connected between the second auxiliary mass rotating nut 10 and the second baffle 14, a third rotating spring 18 is connected between the third auxiliary mass rotating nut 16 and the third baffle 20, and a fourth rotating spring 19 is connected between the fourth auxiliary mass rotating nut 17 and the fourth baffle 21.

[0057] In this embodiment, the materials of the above-mentioned rods, rotating screws, auxiliary mass rotating nuts, baffles, concave plates, cylinders, and rollers can be selected from aluminum alloys or alloy steels according to design requirements, and alloy steels are preferred in this embodiment;

[0058] The material of the spring can be selected from carbon spring steel, low manganese spring steel or chromium vanadium steel according to design requirements. In this embodiment, chromium vanadium steel is preferred.

[0059] like Figure 4 As shown, the connection method of the above rods is all hinged. Considering the influence of rotational damping, the connection interface of the rods is all connected by connector 36. The connector 36 at the connection of the first main rod 1, the second main rod 2, the sixth main rod 6, and the connection of the fourth main rod 4, the third main rod 3, and the fifth main rod 5 is a bearing.

[0060] like Figure 3 As shown, in order to avoid the main body rods, variable stiffness springs 7 and multiple pairs of rotating screws from affecting each other due to their installation positions, the main body rods, variable stiffness springs 7 and rotating screws are connected in parallel. The connecting parts 36 at the connection between the second main body rod 2 and the third main body rod 3, and at the connection between the fifth main body rod 5 and the sixth main body rod 6, adopt a combination of bearings and long rods.

[0061] The aforementioned auxiliary mass rotating nut and rotating spring can be flexibly adjusted according to design requirements to ensure that the nonlinear inertial mass provided by the auxiliary mass rotating nut meets the vibration isolation frequency requirements.

[0062] Unless otherwise specified, all the above connections are made by welding.

[0063] This embodiment is a single-degree-of-freedom bionic vibration isolator. When the main structure is subjected to a vertical excitation force, that is, when this embodiment plays a vibration isolation role, this embodiment will generate vertical movement. The rods will simultaneously move, rotate and deform in the vertical direction, and drive the variable stiffness spring 7, the first spring 30 and the second spring 31 to compress or extend.

[0064] The auxiliary mass mechanism unit in this embodiment functions, causing horizontal and vertical displacement at the connection points of the second main body member 2 and the third main body member 3 with the connection points of the fifth main body member 5 and the sixth main body member 6. This allows the first auxiliary mass rotating nut 9 and the second auxiliary mass rotating nut 10 to rotate in the same direction around the node of the first rotating screw 8, and the third auxiliary mass rotating nut 16 and the fourth auxiliary mass rotating nut 17 to rotate in the same direction around the node of the second rotating screw 15. Simultaneously, the first auxiliary rotating nut 9 and the second auxiliary mass rotating nut 10 will rotate themselves around the thread according to the rotation speed of the first rotating screw 8, and the third auxiliary mass rotating nut 16 and the fourth auxiliary mass rotating nut 17 will rotate in the same direction around the node of the second rotating screw 15. The four auxiliary mass rotating nut 17 rotates around the thread according to the rotation speed of the second rotating screw 15. This rotation increases the inertial force it can provide. The external first baffle 13 and second baffle 14, first rotating spring 11 and second rotating spring 12 ensure that the first auxiliary mass rotating nut 9 and second auxiliary mass rotating nut 10 return to their original positions after their operation. The external third baffle 20 and fourth baffle 21, third rotating spring 18 and fourth rotating spring 19 ensure that the third auxiliary mass rotating nut 16 and fourth auxiliary mass rotating nut 17 return to their original positions after their operation, ultimately providing a large moment of inertia. Through the lever-based auxiliary mass amplification and adjustment mechanism of the auxiliary mass mechanism unit, the equivalent mass of the vibration-isolated structure is equivalently amplified. The vibration-isolated structure receives a nonlinearly enhanced inertial control force related to deformation amplitude, velocity, and acceleration, especially achieving enhanced vibration isolation efficiency and coordinated control of vibration isolation deformation during large deformation stages.

[0065] The variable stiffness mechanism unit in this embodiment functions because it generates vertical movement. Specifically, the connection between the second main member 2 and the third main member 3, and the connection between the fifth main member 5 and the sixth main member 6, experiences horizontal relative movement, causing the variable stiffness spring 7 to deform. While the deformation and restoring force of the variable stiffness spring 7 are linearly related, the hexagonal variable stiffness mechanism unit can also generate a restoring force in the vertical direction. This restoring force exhibits a non-linear relationship with the displacement, thus achieving the variable stiffness effect.

[0066] In this embodiment, the roller-concave plate structure functions effectively. The connection points between the second and third main body members 2 and 3, and between the fifth and sixth main body members 5 and 6, undergo horizontal and vertical displacement. The roller contacts different curves of the concave plate at different vertical positions, causing variations in spring compression and generating different restoring forces. The shape of the concave plate can be adjusted and customized according to parameters such as the natural frequency of the main structure, perfectly achieving vibration isolation enhancement and synergistic control of vibration isolation and deformation during large deformation stages.

[0067] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass, characterized in that, The device includes an auxiliary mass mechanism unit and a variable stiffness mechanism unit. The upper part of the device is connected to the upper platform (34), and the lower part is connected to the lower platform (35). The auxiliary mass mechanism unit includes multiple pairs of auxiliary mass rotating nuts. One pair of auxiliary mass rotating nuts is sleeved on both sides of the rotating screw. Two connecting rods are connected between the two sides of the rotating screw and the main rod. A pair of baffles are provided at both ends of the rotating screw. A rotating spring is connected between the auxiliary mass rotating nuts and the baffles. When the device is activated and vertical displacement occurs, the pair of auxiliary mass rotating nuts rotate clockwise or counterclockwise simultaneously following the rotating screw, forming a rotating unit. At the same time, the auxiliary mass rotating nuts rotate around the thread according to the rotation speed of the rotating screw. The auxiliary mass rotating nuts increase the provided inertial force through rotation. The external baffles and springs ensure that the auxiliary mass rotating nuts return to their original positions after activation, playing the role of auxiliary mass amplification and inertial enhancement to provide enhanced inertial control force. Without reducing the longitudinal bearing capacity of the vibration isolator, it provides amplified nonlinear inertial mass. This inertial mass is related to deformation amplitude, velocity, and acceleration, effectively extending the vibration isolation period. The variable stiffness mechanism unit includes a hexagonal structure and a roller-concave plate structure. The hexagonal structure includes six main rods, and variable stiffness springs (7) are connected between the joints of the main rods. The variable stiffness springs (7) are linear spring units, and their restoring force and displacement are linearly related in the horizontal direction. The hexagonal structure provides nonlinear adjustment of the stiffness of the linear spring. The roller-concave plate structure includes a concave plate, a spring, and a roller. The roller is connected to the main rods, and the roller is in contact with the surface of the concave plate. The concave plate is connected to the lower platform (35) and is pre-stressed. The compressed spring causes the roller to move on the concave plate, the surface of which has a curved shape. When the device performs vibration isolation, it is displaced in the vertical direction, and the roller also contacts the surface of the concave plate at different positions in the vertical direction. The different curved shapes of the concave plate surface cause the spring to generate different restoring forces, resulting in a customized nonlinear force. The roller-concave plate structure can achieve vibration isolation for different working conditions by adjusting parameters under various complex conditions. The parallel connection of the hexagonal structure and the roller-concave plate structure realizes the complementary effect of two nonlinear stiffnesses in the variable space. The main components include a first main component (1), a second main component (2), a third main component (3), a fourth main component (4), a fifth main component (5), and a sixth main component (6). The upper part of the device is connected to the upper platform (34) through the first main component (1), and the lower part is connected to the lower platform (35) through the fourth main component (4). The auxiliary mass includes a first auxiliary mass rotating nut (9) and a second auxiliary mass rotating nut (10), the rotating screw includes a first rotating screw (8), the connecting rod includes a first connecting rod (22) and a second connecting rod (23), the baffle includes a first baffle (13) and a second baffle (14), the rotating spring includes a first rotating spring (11) and a second rotating spring (12), the first auxiliary mass rotating nut (9) and the second auxiliary mass rotating nut (10) are sleeved on both sides of the first rotating screw (8), and the first rotating screw (8) A first connecting rod (22) is connected between one side and the connection point of the second main rod (2) and the third main rod (3), and a second connecting rod (23) is connected between the other side and the connection point of the fifth main rod (5) and the sixth main rod (6). A first baffle (13) and a second baffle (14) are provided at both ends of the first rotating screw (8). A first rotating spring (11) is connected between the first auxiliary mass rotating nut (9) and the first baffle (13), and a second rotating spring (12) is connected between the second auxiliary mass rotating nut (10) and the second baffle (14). The auxiliary mass mechanism unit utilizes the auxiliary mass rotating nut and lever effect to provide nonlinear amplification of the equivalent mass, providing displacement-related nonlinear inertial control effect for the vibration isolation device platform. It also quantitatively amplifies the equivalent nonlinear inertial mass by lever amplification effect and adjustment of auxiliary mass coefficient, thereby extending the equivalent vibration isolation period of the vibration isolation device. Through nonlinear inertia, it enhances the adaptability of the device to large deformation vibration control, thus simultaneously achieving improved vibration isolation efficiency and vibration isolation deformation control. The hexagonal structure involved in the variable stiffness mechanism unit is based on the biomimicry of the spinal ligament, that is, it makes full use of geometric space to achieve low-frequency nonlinear vibration isolation effect, and provides a variable and adjustable hexagonal structure to meet the flexible adjustment of the restoring force and deformation nonlinear relationship. The roller-concave plate structure and spring involved in the variable stiffness mechanism unit jointly simulate the structure of the ligamentum flavum in the human body. The variable stiffness restoring force characteristics are provided by utilizing the restoring force generated in the horizontal direction by the roller and the pre-compressed spring when the roller is offset from the equilibrium position. The nonlinear restoring force of the spring can be customized according to the surface curve shape of the concave plate. It has high sensitivity to micro-vibrations. In a large deformation range, it provides a nonlinear low stiffness effect with the help of the roller-concave plate structure and auxiliary mass mechanism. It improves the vibration isolation effect in the low frequency region without weakening the vertical bearing capacity of the vibration isolator. This structure can achieve vibration isolation for different working conditions by adjusting parameters under various complex conditions. The displacement at both ends of the roller and the spring makes the structural parameters easier to adjust and apply. A nonlinear vibration isolation mechanism based on a roller-concave plate structure and a hexagonal structure is provided. It not only customizes the nonlinear stiffness complementarity effect in the deformable region, but also introduces a lever-based auxiliary mass amplification adjustment mechanism to effectively amplify the equivalent mass of the isolated structure. The joint use of the nonlinear vibration isolation mechanism and the nonlinear inertia mechanism significantly reduces the vibration isolation frequency without weakening the vertical bearing capacity of the vibration isolator, meeting the requirements of vibration isolation efficiency enhancement and vibration isolation deformation control under large amplitude vibration isolation conditions. Furthermore, the phase difference between the inertial control force and the vibration isolation restoring force is used to control the deformation of the vibration isolation layer of the variable stiffness bionic vibration isolation device.

2. The roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 1, characterized in that, A variable stiffness spring (7) is connected between the connection point of the second main member (2) and the third main member (3) and the connection point of the fifth main member (5) and the sixth main member (6).

3. The roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 1, characterized in that, The auxiliary mass rotating nut further includes a pair of third auxiliary mass rotating nuts (16) and fourth auxiliary mass rotating nuts (17), the rotating screw further includes a second rotating screw (15), the connecting rod further includes a third connecting rod (24) and a fourth connecting rod (25), the baffle further includes a third baffle (20) and a fourth baffle (21), and the rotating spring further includes a third rotating spring (18) and a fourth rotating spring (19).

4. The roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 3, characterized in that, The third auxiliary mass rotating nut (16) and the fourth auxiliary mass rotating nut (17) are sleeved on both sides of the second rotating screw (15). A third connecting rod (24) is connected between one side of the second rotating screw (15) and the connection between the second main rod (2) and the third main rod (3), and a fourth connecting rod (25) is connected between the other side and the connection between the fifth main rod (5) and the sixth main rod (6). A third baffle (20) and a fourth baffle (21) are provided at both ends of the second rotating screw (15). A third rotating spring (18) is connected between the third auxiliary mass rotating nut (16) and the third baffle (20), and a fourth rotating spring (19) is connected between the fourth auxiliary mass rotating nut (17) and the fourth baffle (21).

5. A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 1, characterized in that, The roller-concave plate structure also includes a cylinder, within which the spring moves.

6. A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 5, characterized in that, The concave plate includes a first concave plate (26) and a second concave plate (27), and the roller includes a first roller (32) and a second roller (33). The first roller (32) is in contact with the surface of the first concave plate (26), and the second roller (33) is in contact with the surface of the second concave plate (27). The first concave plate (26) and the second concave plate (27) are connected to the ground.

7. A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 6, characterized in that, The spring includes a first spring (30) and a second spring (31), and the cylinder includes a first cylinder (28) and a second cylinder (29). The first spring (30) is connected between the first roller (32) and the connection between the second main rod (2) and the third main rod (3), and the second spring (31) is connected between the second roller (33) and the connection between the fifth main rod (5) and the sixth main rod (6). The first spring (30) moves inside the first cylinder (28), and the second spring (31) moves inside the second cylinder (29).

8. A roller-concave plate type variable stiffness adaptive vibration isolation device with auxiliary mass according to claim 1, characterized in that, The surface of the concave plate has a curved shape, which includes arcs, catenaries, or trigonometric function lines.

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