Self-powered closed-loop vibration control device based on magnetocaloric power generation effect

Abstract

This invention discloses a self-powered closed-loop vibration control device based on the magnetothermal power generation effect, belonging to the field of vibration reduction technology. It mainly includes a magnetic shell, a passive vibration damping device, a solenoid, a thermoelectric generator, and an active vibration damping device. The top of the magnetic shell supports the object to be damped. The magnetic shell can be inserted into the solenoid and can move up and down relative to the solenoid under the action of the object to be damped, thereby generating heat energy. The passive vibration damping device includes an elastic element disposed between the magnetic shell and the solenoid's placement platform. The elastic element can be compressed in the vertical direction. The thermoelectric generator is connected to the magnetic shell and converts heat energy into electrical energy. The active vibration damping device includes a drive device electrically connected to the thermoelectric generator and connected to the magnetic shell. The drive device can provide a force to resist the tendency of the magnetic shell to move. This invention does not require an external power source, achieving self-powering. By combining active and passive vibration damping, it improves the vibration reduction effect and has a simple structure.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, and in particular to a self-powered closed-loop vibration control device based on the magnetothermal power generation effect. Background Technology

[0002] With the development of science and technology, people have increasingly stringent requirements for the precision of mechanical equipment. Vibration, as an unavoidable phenomenon in mechanical operation, has a significant impact on yield and accuracy of test results in manufacturing or testing fields with high precision requirements. To reduce or even suppress this phenomenon, various methods are currently available. Among them, active vibration damping, which can automatically intervene to supplement passive vibration damping, is a proven method with good vibration reduction effects.

[0003] However, current active and passive vibration damping devices suffer from several major problems: 1. Limited by the working environment, they cannot be used in scenarios requiring high flexibility. 2. Complex supporting equipment, often requiring external power supplies or other energy storage devices. 3. Numerous adverse effects during operation, such as heat generation and noise. Current solutions include: using highly integrated piezoelectric block structures as active damping elements to reduce the overall size of the vibration damping device; integrating a piezoelectric energy storage system based on piezoelectric ceramic sheets within the device to address its dependence on external power; and fabricating heat dissipation fins within the device to reduce heat generation. While these methods address some of the issues, they introduce new problems such as the high design difficulty and cost of piezoelectric systems and the increased size of the device due to heat dissipation fins. Therefore, a self-powered closed-loop vibration control device based on the magnetothermal power generation effect is needed, which can ensure good vibration damping without external power, is self-powered, fully utilizes energy, and has a simple structure. Summary of the Invention

[0004] The purpose of this invention is to provide a self-powered closed-loop vibration control device based on the magnetothermal power generation effect to solve the problems existing in the prior art. It can be self-powered without the need for an external power source, and improves the vibration reduction effect by combining active and passive vibration reduction, making full use of energy, and has a simple structure.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] The present invention provides a self-powered closed-loop vibration control device based on the magnetothermal power generation effect, comprising a magnetic housing, the top of which is used to support the object to be vibration damped;

[0007] A solenoid is disposed between a solenoid placement platform and a magnetic housing. The magnetic housing can be inserted into the solenoid and can move up and down relative to the solenoid under the action of the object to be damped, so as to generate heat energy.

[0008] A passive vibration damping device includes an elastic element disposed between the magnetic housing and the solenoid placement platform, with both ends of the elastic element connected to the placement platform and the magnetic housing respectively, and the elastic element being compressible in the vertical direction.

[0009] A thermoelectric generator, which is connected to the magnetic housing, is used to convert the heat energy generated by the magnetic housing into electrical energy;

[0010] An active vibration damping device includes a drive device that is electrically connected to the thermoelectric generator and connected to the magnetic housing. The drive device is capable of providing a force to prevent the magnetic housing from moving.

[0011] Preferably, it further includes a housing capable of accommodating the magnetic housing and for housing the solenoid. The magnetic housing includes a support platform and an annular housing. The annular housing is made of a paramagnetic material. The support platform is fixedly disposed on the top of the annular housing for supporting the object to be damped. The end of the elastic element away from the housing is connected to the bottom of the support platform.

[0012] Preferably, the elastic element includes a spring, and the spring is sleeved on a fixed shaft. The bottom of the fixed shaft is fixedly disposed on the bottom surface of the housing, and the top of the fixed shaft passes through the support platform. Both ends of the spring are fixedly connected to a first spring seat. The first spring seats at both ends are respectively fixedly connected to the bottom surface of the housing and the support platform. A second spring seat is slidably sleeved between the two ends of the spring, and the second spring seat can divide the spring into two segments.

[0013] Preferably, it further includes a lower end protrusion, the first end of which is threaded and fixedly connected to the bottom surface of the housing by the thread, and the second end is fixedly connected to the first spring seat.

[0014] Preferably, the thermoelectric generator includes a thermoelectric generator, a cold contact surface, and a hot contact surface. The hot contact surface is tightly attached to the inner wall of the annular shell and fixed to the bottom surface of the support platform. The cold contact surface is fixedly connected to the bottom of the outer shell. The thermoelectric generator is disposed between the cold contact surface and the hot contact surface and is attached to the cold contact surface and the hot contact surface.

[0015] Preferably, the driving device is a voice coil motor, and the output end of the voice coil motor is fixedly connected to the support platform.

[0016] Preferably, it also includes a restoring spring, which is sleeved outside the drive device and has its two ends abutting against the bottom of the support platform and the bottom surface of the outer shell, respectively.

[0017] Preferably, the system further includes a base, a supplementary solenoid, and a supplementary solenoid housing. The supplementary solenoid is placed inside the supplementary solenoid housing through a threaded groove. The supplementary solenoid housing is rotatably connected to the bottom of the base via a helical connection device. The top of the base is the bottom surface of the housing. Both the supplementary solenoid housing and the base have grooves for the supplementary solenoid to pass through. By rotating the helical connection device, the supplementary solenoid can enter or exit the housing.

[0018] Preferably, it also includes an anti-reverse baffle, which is a wedge-shaped plate fixed to the upper surface of the base by a fixing pin. The wedge surface of the wedge-shaped plate is inclined in the same direction as the rotation direction of the supplementary solenoid, and is used to prevent the solenoid from retracting.

[0019] Preferably, the system further includes a force sensor and a controller. The force sensor is disposed below the support platform and is used to sense the force acting on the support platform. The controller is electrically connected to the force sensor and the voice coil motor. The controller can receive the output signal of the force sensor and adjust and control the voice coil motor.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] The top of the magnetic housing of this invention is used to support the object to be damped. A solenoid is disposed between the solenoid placement platform and the magnetic housing. The magnetic housing can be inserted into the solenoid and can move up and down relative to the solenoid under the action of the object to be damped to generate heat energy. The passive damping device includes an elastic element disposed between the magnetic housing and the solenoid placement platform, and the two ends of the elastic element are respectively connected to the placement platform and the magnetic housing. The elastic element can be compressed in the vertical direction. A thermoelectric generator is connected to the magnetic housing and is used to convert the heat energy generated by the magnetic housing into electrical energy. The active damping device includes a driving device electrically connected to the thermoelectric generator and connected to the magnetic housing. The driving device can provide a force to resist the tendency of the magnetic housing to move. The combination of passive and active vibration damping achieves passive damping by compressing elastic elements in the vertical direction, effectively addressing conventional vibration impacts and providing initial protection for the object to be damped. The drive device in the active vibration damping device can perform more precise vibration control according to the actual situation, further improving the damping effect and ensuring the stability of the object to be damped. The magnetic shell moves up and down inside the solenoid, generating heat energy. The thermoelectric generator converts this heat energy into electrical energy, realizing energy recovery and utilization, reducing the system's dependence on external energy, and improving energy efficiency. The recovered electrical energy powers the drive device of the active vibration damping device, eliminating the need for an external power source and forming a virtuous cycle of energy. It can achieve self-powered operation and has a relatively simple structure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a general structural diagram of a self-powered closed-loop vibration control device based on magnetothermal power generation effect in some embodiments of the present invention;

[0024] Figure 2 This is a top view of a self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention.

[0025] Figure 3 This is a cross-sectional view of a self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention;

[0026] Figure 4 This is a general structural diagram of the passive vibration damping device in some embodiments of the present invention.

[0027] Figure 5 This is a structural diagram of a device for thermoelectric power generation using the magnetocaloric effect in some embodiments of the present invention;

[0028] Figure 6 This is a cross-sectional view of the solenoid storage compartment in some embodiments of the present invention;

[0029] Figure 7 This is a structural diagram of the device for preventing the solenoid from retracting in the base in some embodiments of the present invention;

[0030] Figure 8 This is an exploded view of a self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention.

[0031] Figure 9 This is a schematic diagram of the first part of a self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention.

[0032] Figure 10 This is a schematic diagram of the second part of the self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention.

[0033] Figure 11 This is a comparison of the transmissivity curves of a general vibration damper and a self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention. In the figure: 1-passive vibration damping device; 101-spring; 102-first spring seat; 103-second spring seat; 104-lower end protrusion; 2-thermal power generation device; 201-cold contact surface; 202-thermal power generator; 203-hot contact surface; 3-outer shell; 4-base; 5-supplementary solenoid shell; 501-supplementary solenoid; 502-spiral connection device; 6-voice coil motor; 7-restoring spring; 8-sole; 9-anti-backward device; 10-wire; 11-magnetic shell; 1101-bearing platform; 1102-annular shell; 12-force sensor; 13-controller; 14-fixing pin; 15-sole baffle. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The purpose of this invention is to provide a self-powered closed-loop vibration control device based on the magnetothermal power generation effect to solve the problems existing in the prior art. It can achieve self-powering without the need for an external power source, and improves the vibration reduction effect by combining active and passive vibration reduction, making full use of energy, and has a simple structure.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1-11 As shown, this invention provides a self-powered closed-loop vibration control device based on the magnetothermal power generation effect, including a magnetic housing 11, a passive vibration damping device 1, a solenoid 8, a thermoelectric power generation device 2, and an active vibration damping device. The top of the magnetic housing 11 is used to support the object to be damped. The solenoid 8 is disposed between the solenoid placement platform and the magnetic housing 11. The magnetic housing 11 can pass through the solenoid 8 and can move up and down relative to the solenoid 8 under the action of the object to be damped, which can induce a current in the solenoid 8. At this time, the magnetic housing 11 cuts the magnetic field lines of the magnetic field generated by the solenoid 8, and the magnetic housing 11 generates heat energy. The passive vibration damping device includes an elastic element, which is disposed between the magnetic housing 11 and the solenoid 8 placement platform, and the two ends of the elastic element are respectively connected to the placement platform and the magnetic housing. 11. The elastic element can be compressed in the vertical direction. The thermoelectric generator 2 is connected to the magnetic housing 11 and is used to convert the heat energy generated by the magnetic housing 11 into electrical energy. The active vibration damping device includes a drive device, which is electrically connected to the thermoelectric generator 2 and connected to the magnetic housing 11. The drive device can provide a force to resist the movement tendency of the magnetic housing 11. That is, when the magnetic housing 11 is pressed down by the object to be damped, the drive device can provide an upward force. When the magnetic housing 11 is lifted by the object to be damped, the drive device can provide a downward pulling force. The drive device is used for active vibration damping. When passive vibration damping is insufficient to completely suppress vibration, the drive device operates to achieve active vibration damping. The passive vibration damping device 1 is mainly used for passive vibration damping. When the vibration level is insufficient to trigger active vibration damping, the magnetic housing 11 performs vibration damping.

[0038] The combination of passive and active vibration damping utilizes the compression of elastic elements in the vertical direction to achieve passive vibration damping, effectively addressing conventional vibration impacts and providing initial protection for the object to be damped. The active vibration damping device's drive mechanism allows for more precise vibration control based on actual conditions, further improving the damping effect and ensuring the stability of the object. The magnetic housing 11 moves up and down within the solenoid, generating heat. The thermoelectric generator 2 converts this heat into electrical energy, achieving energy recovery and reducing the system's dependence on external energy sources, thus improving energy efficiency. The recovered electrical energy powers the drive mechanism of the active vibration damping device, eliminating the need for an external power source and forming a virtuous cycle of energy, enabling self-sufficiency. The outer shell 3 accommodates the magnetic housing 11, resulting in a compact structure, small footprint, and ease of installation and use in various scenarios. The outer shell 3 also isolates external interference and prevents heat dissipation, reducing energy loss. The magnetic housing 11 can move up and down relative to the solenoid, adapting to vibrations of different amplitudes and frequencies, offering wide applicability and a relatively simple structure.

[0039] In some embodiments, the self-powered closed-loop vibration control device based on the magnetothermal power generation effect further includes a housing 3, which can accommodate the magnetic housing 11 and is used to house the solenoid 8. The magnetic housing 11 includes a support platform 1101 and an annular housing 1102. The annular housing 1102 is made of paramagnetic material. The support platform 1101 is fixedly disposed on the top of the annular housing 1102 and is used to support the object to be vibration-damped. The end of the elastic element away from the housing 3 is connected to the bottom of the support platform 1101. The surface of the support platform 1101 is a smooth plane. The target workpiece for vibration damping can be fixed to the support platform 1101 by a standard clamping device, or the workpiece can be connected to the support platform 1101 by applying adhesives, waxes, etc. to the platform surface and the bottom of the workpiece.

[0040] Paramagnetic materials are primarily used to generate heat through the magnetocaloric effect, which refers to the temperature change that occurs in magnetic materials when an external magnetic field changes. Magnetization increases the number of parallel elementary magnets within the magnetic material, while simultaneously reducing the exchange energy and the static magnetic energy in the external magnetic field. This reduction is converted into heat energy, causing the overall temperature of the magnet to rise. Paramagnetic materials are those whose magnetic susceptibility is closely related to temperature, including rare earth metals and salts of iron group elements. In paramagnetic materials, electrons in the atoms possess permanent dipole moments. Due to thermal motion, the directions of these moments are random. When a paramagnetic material is placed in an external magnetic field, these tiny magnetic dipoles align along the direction of the magnetic field and become magnetized. Therefore, paramagnetic materials are chosen as the primary component for the magnetocaloric effect.

[0041] In some embodiments, the elastic element includes a spring 101, which is sleeved on a fixed shaft. The bottom of the fixed shaft is vertically disposed on the bottom surface of the housing 3, and the top passes through the support platform 1101. A first spring seat 102 is fixedly connected to both ends of the spring 101, and the first spring seats 102 at both ends are respectively fixedly connected to the bottom surface of the housing 3 and the support platform 1101. A second spring seat 103 is slidably sleeved between the two ends of the spring 101. The second spring seat 103 divides the spring into two segments, increasing the range of elastic coefficient variation of the spring 101. This allows the spring 101 to adaptively adjust according to different vibration intensities and frequencies. During small-amplitude vibrations, the spring 101 can operate in a softer state, providing a gentler damping effect. During large-amplitude vibrations, the second spring seat 103 compresses the spring 101, making the spring 101 stiffer, thereby enabling it to withstand greater impact forces and improving the damping effect. The sliding design of the second spring seat 103 allows the spring 101 to be subjected to force more evenly during operation. When vibration occurs, the second spring seat 103 adjusts its position according to the force on the spring 101, so that the force on each part of the spring 101 is more balanced, avoiding damage to the spring 101 due to excessive local force, and improving the service life and reliability of the spring 101.

[0042] It should be noted that the springs 101 are preferably six in number and evenly arranged along the axial direction of the magnetic housing 11 to uniformly bear the external force. It should also be noted that the springs 101 can be slightly tilted. Under certain circumstances, when the springs are tilted, the force in the direction of vibration can be decomposed. For example, when there is an oblique vibration impact, the tilted springs can simultaneously dampen the vertical and horizontal components of the force.

[0043] In some embodiments, the self-powered closed-loop vibration control device based on the magnetothermal power generation effect further includes a lower protrusion 104. The lower protrusion 104 is threaded, with one end fixedly connected to the first spring seat 102 and the other end fixedly connected to the bottom surface of the housing 3 by the thread. It is quick to install and disassemble and has high reliability.

[0044] In some embodiments, the thermoelectric generator 2 includes a thermoelectric generator 202, a cold contact surface 201, and a hot contact surface 203. The hot contact surface 203 is tightly attached to the inner wall of the annular shell 1102 and fixed to the bottom surface of the support platform 1101. The cold contact surface 201 is fixedly connected to the bottom of the outer shell 3. The thermoelectric generator 202 is disposed between and attached to the cold contact surface 201 and the hot contact surface 203. The hot contact surface 203 is tightly connected to the annular shell 1102 made of paramagnetic material and is fixed to the lower surface of the support platform 1101. The annular shell 1102 made of paramagnetic material surrounds the outer surface of the hot contact surface 203, is closer to the solenoid, and has a more significant magnetocaloric effect, generating more heat during vibration, thereby generating more electrical energy. The thermoelectric generator 202 is mainly used to utilize the magnetocaloric effect of paramagnetic materials. As the paramagnetic material heats up, the heat is conducted to the temperature difference formed between the hot contact surface 203 and the cold contact surface 201 to generate electricity, converting the heat energy generated by the magnetocaloric effect into electrical energy. The principle of the thermoelectric generator 202 is based on the Seebeck effect, that is, a p-type and an n-type thermoelectric element are connected by electrodes at the hot contact surface, and cold contact surface electrodes are connected to form a single thermoelectric element.

[0045] In some embodiments, the driving device is a voice coil motor 6. The output end of the voice coil motor 6 is fixedly connected to the support platform 1101, and the voice coil motor 6 is electrically connected to the thermoelectric generator 202 via wire 10. The voice coil motor 6 has extremely high positioning accuracy and response speed, enabling precise control of the movement of the support platform 1101, thereby achieving precise vibration reduction of the object to be vibration-damped. It can quickly adjust the position of the support platform 1101 according to different vibration conditions, ensuring that the object to be vibration-damped is always in a stable state. It can also respond promptly and effectively to minor vibrations, providing reliable protection for vibration reduction of high-precision equipment. Furthermore, the voice coil motor 6 typically has a small size and light weight, which does not add too much burden to the entire vibration control device, making the device more compact and portable, suitable for occasions with limited space.

[0046] In some embodiments, the self-powered closed-loop vibration control device based on the magnetothermal power generation effect further includes a restoring spring 7. The restoring spring 7 is sleeved on the drive device, and its two ends abut against the bottom of the support platform 1101 and the bottom surface of the housing 3, respectively. Specifically, it can be installed between the support platform 1101 and the bottom surface of the housing 3 by welding or slotting. When vibration occurs, the drive device (such as the voice coil motor 6) is mainly used to actively control the position of the support platform 1101 to reduce vibration, while the restoring spring 7, as an auxiliary component, can provide additional elastic restoring force when the support platform 1101 is displaced by vibration. For example, when the support platform 1101 moves downward, the restoring spring 7 is compressed, generating an upward elastic force, which helps the support platform 1101 return to the equilibrium position more quickly. Combined with the active control of the drive device, this dual guarantee enhances the overall device's ability to suppress vibration.

[0047] In some embodiments, the self-powered closed-loop vibration control device based on the magnetocaloric power generation effect further includes a base 4, a supplementary solenoid 501, and a supplementary solenoid shell 5. The supplementary solenoid 501 is placed inside the supplementary solenoid shell 5 through a threaded groove. The supplementary solenoid shell 5 is connected to the bottom of the base 4 through a helical connection device 502. The helical connection device 502 has a rectangular thread, enabling in-situ rotation. The top of the base 4 is the bottom surface of the outer shell 3, and both the supplementary solenoid shell 5 and the base 4 have grooves for the supplementary solenoid 501 to pass through. By rotating the helical connection device 502, the supplementary solenoid 501 can enter or exit the outer shell 3. The supplementary solenoid shell 5 surrounds a solenoid with 20 turns. It can be added to the vibration damping device by rotating counterclockwise through the grooves of the base 4 and the supplementary solenoid shell 5. Increasing the number of turns of the solenoid can significantly increase the magnitude of the magnetic field change, thereby increasing the magnitude of the magnetocaloric effect, increasing the thermoelectric current, and achieving higher intensity active vibration damping. Clockwise rotation can reduce the magnitude of the magnetic field.

[0048] In some embodiments, the self-powered closed-loop vibration control device based on the magnetothermal power generation effect further includes anti-backward baffles 9, preferably six evenly arranged. The anti-backward baffles 9 are wedge-shaped plates, fixed to the upper surface of the base 4 by fixing pins 14. The wedge surface of the wedge plate is inclined in the same direction as the rotation direction of the supplementary solenoid 501, which is used to prevent the solenoid from retracting. The anti-backward baffles 9 are made of resin material with a certain strength and are made into a wedge shape that conforms to the release direction of the solenoid, i.e., counterclockwise rotation release. The solenoid experiences minimal resistance when rotating counterclockwise, and experiences greater resistance when the solenoid has a tendency to retract into the storage compartment, i.e., a counterclockwise rotation tendency, thus achieving the purpose of preventing retraction. The fixing pins 14 fix the baffles to the upper surface of the base 4, and the top tightening force provides resistance for the anti-backward baffles.

[0049] In some embodiments, the self-powered closed-loop vibration control device based on the magnetothermal power generation effect further includes a force sensor 12 and a controller 13. The force sensor 12 is disposed below the support platform 1101 to sense the force acting on the support platform 1101. The force sensor 12 is a dynamic force sensor, capable of detecting changes in force in real time. The controller 13 is electrically connected to the force sensor 12 and the voice coil motor 6. The controller 13 can receive the output signal of the force sensor 12 and adjust and control the voice coil motor 6. The dynamic force sensor installed at the bottom of the support platform 1101 is mainly used to calculate the logical axis displacement signal of the center of mass of the support platform 1101 and upload the axial vibration force signal of the vibration reduction device to the controller 13. Subsequently, the controller 13 calculates the logical axis control signal based on the logical axis displacement signal through an active control algorithm. Finally, the physical axis control signal is calculated. The controller 13 transmits the physical axis control signal to the voice coil motor 6 for vibration compensation to achieve active vibration reduction.

[0050] Other points to note are that the passive vibration damping device is a traditional spring-mass-damping unit, achieving simple passive vibration damping. Its transmissibility curve function G is:

[0051]

[0052] In the formula, X1 is the vibration displacement of the bearing platform after being loaded, X0 is the vibration displacement of the base, i.e., the foundation platform, C is the equivalent damping of the device, K is the equivalent stiffness between the bearing platform and the base, M is the mass of the bearing platform, s=jω is the complex variable of the Laplace transform, and ω is the frequency domain coefficient.

[0053] Based on the passive damping transpose, a voice coil motor powered by the magnetocaloric effect is added for active damping. Its active feedback control loop operates in a mode of dynamic force sensor feedback, controller calculation, and voice coil motor output. When the data collected by the dynamic force sensor exceeds the passive damping capability range, active damping is triggered, forming a combined active and passive damping device. Its open-loop transmissivity curve function G0 is as follows:

[0054]

[0055] In the formula, X2 represents the vibration displacement of the bearing platform when using a combined active and passive vibration reduction method, K0 is the restoring spring stiffness, K is the equivalent stiffness of the system, C is the equivalent damping of the system, M is the mass of the bearing platform, s=jω is the complex variable of the Laplace transform, and ω is the frequency domain coefficient. Using the vibration signal on the bearing platform as a reference, the passive vibration reduction unit is actively controlled (in this embodiment, a PI force feedback control algorithm is used) to form a combined active and passive vibration reduction unit, where the control force F:

[0056]

[0057] The time-domain formula for the proportional-integral (PI) control algorithm is as follows:

[0058]

[0059] The frequency domain formula for the proportional-integral (PI) control algorithm is:

[0060]

[0061] In the formula, k p k is the proportional gain coefficient. i Here, e(t) is the integral gain coefficient, e(t) is the error between the logic axis control signal and the logic axis displacement signal, t is the time coefficient, s=jω is the complex variable of the Laplace transform, and ω is the frequency domain coefficient.

[0062] The transmissivity curve function G of the active-passive composite vibration damping device under closed-loop conditions. c :

[0063]

[0064] like Figure 11 As shown in the figure, the solid line clearly indicates that the natural frequency of a typical vibration damper is relatively high, and the resonance peak is also high. This suggests that its vibration damping effect is extremely limited, and the coverage area is small. The dotted line in the figure represents the transmissibility curve when the solenoid turns are 20 in this embodiment; the dashed line represents the transmissibility curve when the solenoid turns are 30 in this embodiment; and the dotted-dashed line represents the transmissibility curve when the solenoid turns are 40 in this embodiment. It can be seen that as the number of solenoid turns increases, the vibration damping effect of the self-powered closed-loop vibration control device based on the magnetothermal power generation effect in this embodiment continuously improves. The resonance suppression effect at the natural frequency becomes better and better, the system vibration amplitude decreases, and the natural frequency shifts forward significantly, with a significant increase in the range of the vibration damping frequency band.

[0065] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A self-powered closed-loop vibration control device based on the magnetothermal power generation effect, characterized in that: include A magnetic housing, the top of which is used to support the object to be damped; A solenoid is disposed between a solenoid placement platform and a magnetic housing. The magnetic housing can be inserted into the solenoid and can move up and down relative to the solenoid under the action of the object to be damped, so as to generate heat energy. A passive vibration damping device includes an elastic element disposed between the magnetic housing and the solenoid placement platform, with both ends of the elastic element connected to the solenoid placement platform and the magnetic housing respectively, and the elastic element being compressible in the vertical direction. A thermoelectric generator, which is connected to the magnetic housing, is used to convert the heat energy generated by the magnetic housing into electrical energy; An active vibration damping device includes a driving device that is electrically connected to the thermoelectric generator and connected to the magnetic housing. The driving device is capable of providing a force to resist the tendency of the magnetic housing to move. The outer casing is capable of accommodating the magnetic housing and is used to house the solenoid. The magnetic housing includes a support platform and an annular housing. The annular housing is made of a paramagnetic material. The support platform is fixedly disposed on the top of the annular housing and is used to support the object to be damped. The end of the elastic element away from the outer casing is connected to the bottom of the support platform. It also includes a base, a supplementary solenoid, and a supplementary solenoid housing. The supplementary solenoid is placed inside the supplementary solenoid housing through a threaded groove. The supplementary solenoid housing is rotatably connected to the bottom of the base through a helical connection device. The top of the base is the bottom surface of the housing. Both the supplementary solenoid housing and the base have grooves for the supplementary solenoid to pass through. By rotating the helical connection device, the supplementary solenoid can enter or exit the housing.

2. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 1, characterized in that: The elastic element includes a spring, which is sleeved on a fixed shaft. The bottom of the fixed shaft is fixedly disposed on the bottom surface of the housing, and the top of the fixed shaft passes through the support platform. Both ends of the spring are fixedly connected to a first spring seat, which is fixedly connected to the bottom surface of the housing and the support platform, respectively. A second spring seat is slidably sleeved between the two ends of the spring, and the second spring seat can divide the spring into two segments.

3. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 2, characterized in that: It also includes a lower end protrusion, the first end of which is threaded and fixedly connected to the bottom surface of the housing by the thread, and the second end of which is fixedly connected to the first spring seat.

4. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 1, characterized in that: The thermoelectric generator includes a thermoelectric generator, a cold contact surface, and a hot contact surface. The hot contact surface is tightly attached to the inner wall of the annular shell and fixed to the bottom surface of the support platform. The cold contact surface is fixedly connected to the bottom of the outer shell. The thermoelectric generator is disposed between the cold contact surface and the hot contact surface and is attached to the cold contact surface and the hot contact surface.

5. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 1, characterized in that: The driving device is a voice coil motor, and the output end of the voice coil motor is fixedly connected to the support platform.

6. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 1, characterized in that: It also includes a restoring spring, which is sleeved outside the drive device and has its two ends abutting against the bottom of the support platform and the bottom surface of the outer shell, respectively.

7. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 1, characterized in that: It also includes an anti-backward baffle, which is a wedge-shaped plate fixed to the upper surface of the base by a fixing pin. The wedge surface of the wedge-shaped plate is inclined in the same direction as the rotation direction of the supplementary solenoid, and is used to prevent the supplementary solenoid from retracting.

8. The self-powered closed-loop vibration control device based on magnetocaloric power generation effect according to claim 5, characterized in that: It also includes a force sensor and a controller. The force sensor is located below the support platform and is used to sense the force on the support platform. The controller is electrically connected to the force sensor and the voice coil motor. The controller can receive the output signal of the force sensor and adjust and control the voice coil motor.

Images