A new self-centering multiple energy dissipation quasi-zero stiffness vibration isolation device

Abstract

The application discloses a novel self-resetting multiple energy dissipation quasi-zero stiffness vibration isolation device, which comprises a containing cylinder, a bearing platform, a metal guide pipe, a platform plate, a magnetic spring and a self-resetting system, the self-resetting system is fixedly installed in the containing cylinder, the bearing platform is connected to the upper end of the self-resetting system, the metal guide pipe is arranged in the containing cylinder, the upper end of the metal guide pipe is fixedly connected with the lower end surface of the bearing platform, the platform plate is further arranged between the bearing platform and the containing cylinder, the outer side surface of the platform plate is welded to the inner side wall surface of the containing cylinder, and the magnetic spring is further arranged between the platform plate and the containing cylinder. The vibration isolation device has the stiffness characteristics of high static and low dynamic, and can effectively solve the problems of single energy dissipation damping mode and poor self-resetting capacity of the traditional energy dissipation quasi-zero stiffness vibration isolator.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, specifically to a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device. Background Technology

[0002] With the continuous improvement of modern technology and industrial standards, the working environment of mechanical equipment in engineering fields such as aerospace and rail vehicles is becoming more complex and severe. This places higher demands on these machines. Excessive vibration amplitude during use can significantly reduce their lifespan and working accuracy, leading to increased building safety and maintenance costs for improved occupancy comfort. Traditional energy-dissipating quasi-zero stiffness vibration isolators suffer from relatively simple energy dissipation and vibration reduction methods, as well as poor self-resetting capabilities, resulting in limited effectiveness in eliminating these adverse effects and thus limiting their vibration reduction capabilities.

[0003] Therefore, there is an urgent need to study a self-resetting multiple quasi-zero stiffness vibration isolation system in the field of energy dissipation and vibration reduction. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device, including a housing cylinder, a load-bearing platform, a metal conduit, a platform plate, a magnetic spring, and a self-resetting system. The self-resetting system is fixedly installed inside the housing cylinder, and the load-bearing platform is connected to the upper end of the self-resetting system. The metal conduit is disposed inside the housing cylinder, and the upper end of the metal conduit is fixedly connected to the lower end face of the load-bearing platform. A platform plate is also disposed between the load-bearing platform and the housing cylinder. The outer side of the platform plate is welded to the inner wall of the housing cylinder. A magnetic spring is also disposed between the platform plate and the housing cylinder.

[0005] Furthermore, the magnetic spring includes an iron core, an energized coil, and a permanent magnet. The iron core includes an upper iron core and a lower iron core, which are respectively fixed to the lower end face of the platform plate and the inner bottom surface of the accommodating cylinder. The energized coil is wound and fixed on the upper and lower iron cores, and the permanent magnet is fixed to the metal conduit through a connecting rod.

[0006] Furthermore, the magnetic spring is provided in multiple sets. Each set of magnetic springs includes an upper iron core, a lower iron core, an energized coil, and a permanent magnet, all of which are positioned in a corresponding manner. The central axes of the iron core, the energized coil, and the permanent magnet that make up a set of magnetic springs are on the same straight line.

[0007] Furthermore, the self-resetting system includes a thermal resistor, an SMA spring, and a piezoelectric layer. The piezoelectric layer includes an upper piezoelectric layer and a lower piezoelectric layer, which are arranged in an upper-lower correspondence. The upper piezoelectric layer is fixedly installed on the four corners of the lower end face of the load-bearing platform, and the lower piezoelectric layer is fixedly installed on the four corners of the inner side of the accommodating cylinder. The SMA spring is connected between the upper piezoelectric layer and the lower piezoelectric layer. A thermal resistor is provided on the inner side of the SMA spring, and the outer side wall of the thermal resistor is connected to the inner side wall of the SMA spring.

[0008] Furthermore, the platform plate has through holes at its four corners for the SMA spring to pass through, and the upper end face of the heat transfer resistor is on the same horizontal line as the lower end face of the platform plate.

[0009] Furthermore, a through hole is provided in the middle part of the platform plate to allow the metal conduit to pass through, and there is a gap between the lower end of the metal conduit and the lower inner end face of the accommodating cylinder.

[0010] Furthermore, the metal conduit is fixed to the lower end face of the load-bearing platform by a threaded connection, and the metal conduit has a hollow, layered structure on the inside.

[0011] Furthermore, the inner side of the metal conduit is provided with a layered plate, which divides the interior of the metal conduit into three closed spaces, and a viscous liquid is placed in the closed spaces.

[0012] Furthermore, when external vibrations act on the metal conduit, the viscous liquid flows due to the interaction between liquid molecules. At this time, the damping force generated by the viscous liquid dissipates energy. The viscous damping force is proportional to the vibration speed of the metal conduit. As the metal conduit vibrates, the viscous liquid collides with the wall of the metal conduit, converting the kinetic energy generated by the fluid motion into heat energy, thereby dissipating the energy input by vibration.

[0013] Furthermore, when the load-bearing platform vibrates, the load-bearing platform contacts the inner wall of the accommodating cylinder but does not compress it, and vertical vibration can occur within the accommodating cylinder.

[0014] The present invention has the following beneficial effects: 1. The ability of SMA springs to recover their original state when heated, when combined with a heat transfer resistor, can provide strong self-resetting performance after vibration, thus improving the utilization rate of vibration isolation devices.

[0015] 2. By connecting the components in the vibration isolation device in a certain way, multiple energy dissipation effects can be achieved, including the damping energy dissipation of viscous liquid and its collision energy dissipation with the metal conduit wall, the heating energy dissipation of the heat transfer resistor, the friction energy dissipation of the heat transfer resistor and the SMA spring, and the damping energy dissipation of the SMA spring.

[0016] 3. By designing the metal conduit into a layered structure and reducing the spacing between each layer, the contact area between the viscous liquid and the inner wall of the metal conduit is increased, thereby effectively increasing the collision energy dissipation of the viscous liquid. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to the present invention. Figure 2 This is a front view of the internal structure of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device, SMA spring, under a certain degree of compression, according to the present invention. Figure 3 This is a top view of the internal structure of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to the present invention (1-1). Figure 4 This is a top view of the internal structure of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to the present invention (2-2). Figure 5 This is a top-view three-dimensional schematic diagram of the internal structure of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device of the present invention (2-2). Figure 6 This is a frontal three-dimensional schematic diagram of the internal structure of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to the present invention; Figure 7 This is a three-dimensional schematic diagram of the internal structure of the metal conduit of a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to the present invention.

[0018] Among them: 1. Containing cylinder; 2. Load-bearing platform; 3. Metal conduit; 4. Platform plate; 5. Iron core; 6. Electric coil; 7. Permanent magnet; 8. Thermal resistor; 9. SMA spring; 10. Piezoelectric layer; 11. Viscous liquid; 12. Magnetic spring; 13. Layered plate. Detailed Implementation

[0019] The semi-automatic vibration damping and isolation device of the present invention will be further described in detail below with reference to the accompanying drawings. The present invention provides a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device, belonging to the category of self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation devices, possessing excellent vibration isolation performance. The system composed of the SMA spring 9, the thermal resistor 8, and the piezoelectric layer 10 achieves self-resetting. The multi-energy-dissipating system includes the damping energy dissipation of the viscous liquid 11 and its collision energy dissipation with the conduit wall, the heating energy dissipation of the thermal resistor 8, the frictional energy dissipation between the thermal resistor 8 and the SMA spring 9, and the damping energy dissipation of the SMA spring 9. The vibration isolation device of the present invention has high static and low dynamic stiffness characteristics, and can effectively solve the problems of relatively simple energy dissipation and vibration reduction methods and poor self-resetting ability in traditional energy-dissipating quasi-zero stiffness vibration isolators.

[0020] According to an embodiment of the present invention, in conjunction with the appendix Figure 1-7 As shown, the present invention proposes a novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device, which consists of a housing cylinder 1, a load-bearing platform 2, a metal conduit 3, a platform plate 4, an iron core 5, an energized coil 6, a permanent magnet 7, a thermal resistor 8, an SMA spring 9, a piezoelectric layer 10, a viscous liquid 11, a magnetic spring 12, and a layered plate 13. The accommodating cylinder 1 is a square shell structure with an open top. A self-resetting system is fixedly installed inside the accommodating cylinder 1. The self-resetting system includes a thermal resistor 8, an SMA spring 9, and a piezoelectric layer 10. The piezoelectric layer 10 includes an upper piezoelectric layer and a lower piezoelectric layer, which are arranged in an upper-lower corresponding relationship. The upper piezoelectric layer is fixedly installed on the four corners of the lower end face of the load-bearing platform 2, and the lower piezoelectric layer is fixedly installed on the four corners of the inner side of the accommodating cylinder 1. The SMA spring 9 is connected between the upper piezoelectric layer and the lower piezoelectric layer. A thermal resistor 8 is provided on the inner side of the SMA spring 9, and the outer side wall of the thermal resistor 8 is connected to the inner side wall of the SMA spring 9.

[0021] According to an embodiment of the present invention, a load-bearing platform 2 is connected to the upper end of the self-resetting system, the metal conduit 3 is disposed in the receiving cylinder 1, the upper end of the metal conduit 3 is fixedly connected to the lower end face of the load-bearing platform 2, a platform plate 4 is also disposed between the load-bearing platform 2 and the receiving cylinder 1, the outer side of the platform plate 4 is welded to the inner side wall of the receiving cylinder 1, and a magnetic spring 12 is also disposed between the platform plate 4 and the receiving cylinder 1.

[0022] According to an embodiment of the present invention, the magnetic spring 12 includes an iron core 5, an energized coil 6, and a permanent magnet 7. The iron core 5 includes an upper iron core and a lower iron core, which are respectively fixed to the lower end face of the platform plate 4 and the inner bottom surface of the accommodating cylinder 1. The energized coil 6 is wound and fixed on the upper and lower iron cores. The permanent magnet 7 is fixed to the metal conduit 3 by a connecting rod. Multiple sets of magnetic springs 12 are provided, as shown in the attached figure. Figure 4-5 As shown, the present invention preferably sets the magnetic spring 12 into 4 groups. Each group of magnetic spring 12 includes the upper iron core, lower iron core, energized coil 6 and permanent magnet 7 corresponding to the position. The central axes of the iron core 5, energized coil 6 and permanent magnet 7 that make up a group of magnetic spring 12 are on the same straight line.

[0023] According to an embodiment of the present invention, the SMA spring 9 provides positive stiffness for the vibration isolation device. The energized coil 6 is fixed to the iron core 5, and current generated by the piezoelectric layer 10 is passed through it to form an electromagnet. The electromagnet consists of the iron core 5 and the energized coil 6. The electromagnet and the permanent magnet 7 form a magnetic spring 12 with negative stiffness. Upper and lower corresponding magnetic springs form a group, preferably four groups. The SMA spring 9 and the magnetic spring 12 constitute a quasi-zero stiffness system.

[0024] According to an embodiment of the present invention, the multi-energy dissipation system of the present invention includes: damping energy dissipation of the viscous liquid 11 and collision energy dissipation with the inner wall of the metal conduit 3, heating energy dissipation of the heat transfer resistor 8, frictional energy dissipation between the heat transfer resistor 8 and the SMA spring 9, and damping energy dissipation of the SMA spring 9. In the quasi-zero stiffness vibration isolation system of the present invention, the positive stiffness component SMA spring 9 is connected at both ends to the piezoelectric layer 10 and placed in the four corners inside the housing cylinder 1. The heat transfer resistor 8 is placed on the piezoelectric layer 10 at the lower part of the central space of the SMA spring 9 and is in close contact with the SMA spring 9. The top of the heat transfer resistor 8 is at the same horizontal line as the platform plate 4. When the weight vibrates on the load-bearing platform 2, the SMA spring 9 expands and contracts accordingly. Therefore, the piezoelectric layers 10 fixed above and below the SMA spring 9 are subjected to pressure and generate current. In the quasi-zero stiffness vibration isolation system, the upper iron core of the negative stiffness component magnetic spring 12 is connected to the platform plate 4, and the lower iron core is connected to the inner bottom surface of the housing cylinder 1, with the upper and lower iron cores corresponding to each other.

[0025] According to an embodiment of the present invention, the platform plate 4 is welded inside the housing cylinder 1, at a certain distance from the load-bearing platform 2. The four vertices of the platform plate 4 have circular holes for the SMA springs 9 to pass through, and the center has a circular hole for the metal conduit 3 to pass through. The permanent magnet 7 is fixed to the metal conduit 3 via a connecting rod, located on the central axis of each set of magnetic springs 12 and corresponding to the magnetic springs 12. The SMA springs 9 and magnetic springs 12 constitute a quasi-zero stiffness system with "high static and low dynamic" characteristics for vibration isolation.

[0026] According to an embodiment of the present invention, the load-bearing platform 2 contacts the inner wall of the housing cylinder 1 but does not compress it, and can undergo a certain degree of vertical vibration within the housing cylinder 1. Current is passed into the heat transfer resistor 8 inside the SMA spring 9, which is placed in close contact with the center space of the SMA spring 9. When energized, the heat transfer resistor 8 generates heat and consumes energy, transferring the heat to the SMA spring 9, causing the SMA spring 9 to tend to return to its original shape when heated.

[0027] According to an embodiment of the present invention, the metal conduit 3 is fixed to the lower end face of the load-bearing platform 2 by a threaded connection. A layered plate 13 is provided on the inner side of the metal conduit 3, dividing the interior of the metal conduit 3 into three enclosed spaces, such as... Figure 7As shown, viscous liquid 11 is placed in each of the three enclosed spaces. A metal conduit 3 connected to the underside of the load-bearing platform 2 moves up and down with the vibration of the platform 2. The metal conduit 3 is designed with a layered structure to reduce the spacing between each layer. The viscous liquid 11 is placed inside the metal conduit 3. When external vibration acts on the metal conduit 3, the viscous liquid 11 flows due to the interaction between liquid molecules. At this time, the viscous liquid 11 generates a damping force to dissipate energy; the viscous damping force is proportional to the velocity. As the metal conduit 3 vibrates, the viscous liquid 11 collides with the inner wall of the metal conduit 3, converting the kinetic energy generated by the fluid motion into heat energy, thereby dissipating the energy input by vibration. Furthermore, the sloshing of the viscous liquid 11 within the metal conduit 3 generates a wave force that also dissipates energy.

[0028] A novel self-resetting, multi-energy-dissipating quasi-zero stiffness vibration isolation device achieves quasi-zero stiffness vibration isolation through the following process: An SMA spring 9 provides positive stiffness to the isolation device. An energized coil 6 is wound and fixed on an iron core 5. Current generated by a piezoelectric layer 10 is passed through, forming an electromagnet composed of the iron core 5 and the energized coil 6. The electromagnet and the permanent magnet 7 form a magnetic spring 12 with negative stiffness, constituting a quasi-zero stiffness system with "high static and low dynamic" characteristics for vibration isolation. When a heavy object vibrates on the load-bearing platform 2, the SMA spring 9 expands and contracts accordingly. The piezoelectric layer 10 fixed at the upper and lower ends of the SMA spring 9 is subjected to pressure, generating current. This current is passed through a heat transfer resistor 8 inside the SMA spring 9. The heat transfer resistor 8 is placed in the central space of the SMA spring 9, in close contact with it. The heat transfer resistor 8 generates heat and dissipates energy after being energized, transferring the heat to the SMA spring 9. The SMA spring 9 tends to return to its original shape when heated. When the metal conduit 3 below the load-bearing platform 2 moves up and down with the vibration of the load-bearing platform 2, the metal conduit 3 is designed with a layered structure to reduce the spacing between each layer. A viscous liquid 11 is injected inside the metal conduit 3. As the viscous liquid 11 flows, it generates damping force, dissipating energy. With the vibration of the metal conduit 3, the viscous liquid 11 collides with the wall of the metal conduit 3, converting the kinetic energy generated by the movement of the viscous liquid 11 into heat energy, thereby dissipating the energy input by vibration. Furthermore, the sloshing of the viscous liquid 11 within the metal conduit 3 generates wave forces, which also dissipate energy.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A novel self-resetting, multi-energy-dissipating, quasi-zero stiffness vibration isolation device, characterized in that, The device includes a housing cylinder, a load-bearing platform, a metal conduit, a platform plate, a magnetic spring, and a self-resetting system. The self-resetting system is fixedly installed inside the housing cylinder. The self-resetting system includes a thermal resistor, an SMA spring, and a piezoelectric layer. The piezoelectric layer comprises an upper piezoelectric layer and a lower piezoelectric layer, arranged in an upper-lower correspondence. The upper piezoelectric layer is fixedly installed at the four corners of the lower end face of the load-bearing platform, and the lower piezoelectric layer is fixedly installed at the four corners of the inner side of the housing cylinder. The SMA spring is connected between the upper and lower piezoelectric layers. A thermal resistor is disposed inside the SMA spring, and the outer wall of the thermal resistor is connected to the inner wall of the SMA spring. The piezoelectric layer is configured such that when the load-bearing platform vibrates, the piezoelectric layer is compressed and generates current. The heat transfer resistor receives this current and generates heat, which is then transferred to the SMA spring, causing the SMA spring to tend to return to its original shape. The SMA spring provides positive stiffness for the vibration isolation device. The energized coil is fixed on the iron core, and the current generated by the piezoelectric layer is passed through to form an electromagnet. The electromagnet is composed of an iron core and an energized coil. The electromagnet and the permanent magnet form a magnetic spring with negative stiffness. The upper and lower corresponding magnetic springs are a group, and four groups are set up. The SMA spring and the magnetic spring constitute a quasi-zero stiffness system. The heat transfer resistor is placed on the piezoelectric layer at the lower part of the central space of the SMA spring and is in close contact with the SMA spring. The top of the heat transfer resistor is on the same horizontal line as the platform plate. A load-bearing platform is connected to the upper end of the self-resetting system. The metal conduit is placed inside the accommodating cylinder. The upper end of the metal conduit is fixedly connected to the lower end face of the load-bearing platform. The metal conduit has a hollow, layered structure on the inside. A layered plate is provided on the inner side of the metal conduit to divide the inside of the metal conduit into three closed spaces. A viscous liquid is placed in the closed space. A platform plate is also provided between the load-bearing platform and the receiving cylinder. The outer side of the platform plate is welded to the inner wall of the receiving cylinder. A magnetic spring is also provided between the platform plate and the receiving cylinder.

2. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 1, characterized in that, The magnetic spring includes an iron core, an energized coil, and a permanent magnet. The iron core includes an upper iron core and a lower iron core, which are respectively fixed to the lower end face of the platform plate and the inner bottom surface of the accommodating cylinder. The energized coil is wound and fixed on the upper and lower iron cores, and the permanent magnet is fixed to the metal conduit through a connecting rod.

3. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 2, characterized in that, Each set of magnetic springs includes an upper iron core, a lower iron core, an energized coil, and a permanent magnet, all positioned in a given location. The central axes of the iron core, energized coil, and permanent magnet that make up a set of magnetic springs are on the same straight line.

4. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 1, characterized in that, The platform plate has through holes at its four corners to allow the SMA springs to pass through, and the upper end face of the heat transfer resistor is on the same horizontal line as the lower end face of the platform plate.

5. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 1, characterized in that, The platform plate also has a through hole in the middle part to allow the metal conduit to pass through, and there is a gap between the lower end of the metal conduit and the lower inner end face of the accommodating cylinder.

6. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 1, characterized in that, The metal conduit is fixed to the lower end face of the load-bearing platform by a threaded connection.

7. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 1, characterized in that, When external vibrations act on the metal conduit, the viscous liquid flows due to the interaction between liquid molecules. At this time, the damping force generated by the viscous liquid dissipates energy, and the viscous damping force is proportional to the vibration speed of the metal conduit.

8. The novel self-resetting multi-energy-dissipating quasi-zero stiffness vibration isolation device according to claim 1, characterized in that, When the load-bearing platform vibrates, it contacts the inner wall of the accommodating cylinder but does not compress it, and it can vibrate vertically within the accommodating cylinder.

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