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

Abstract

The invention discloses a self-energized closed-loop vibration control device based on a magnetothermal power generation effect, which relates to the technical field of vibration reduction and mainly comprises a magnetic shell, a passive vibration reduction device, a solenoid, a thermoelectric power generation device and an active vibration reduction device, the top of the magnetic shell is used for bearing an object to be subjected to vibration reduction, the magnetic shell can be arranged in the solenoid in a penetrating mode and can move up and down relative to the solenoid under the action of the object to be subjected to vibration reduction so as to generate heat energy, the passive vibration reduction device comprises an elastic piece which is arranged between the magnetic shell and a placement platform of the solenoid, and the elastic piece can be compressed in the vertical direction. The thermoelectric power generation device is connected with the magnetic shell and converts heat energy into electric energy, the active vibration reduction device comprises a driving device which is electrically connected with the thermoelectric power generation device and the magnetic shell, and the driving device can provide force for preventing the movement trend of the magnetic shell. According to the self-powered vibration damper, an external power source is not needed, self-powered can be achieved, the vibration damping effect is improved through combination of active vibration damping and passive vibration damping, and the structure is simple.

Description

Technical Field

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

[0002] With the development of science and technology, people have increasingly stringent requirements on the precision of mechanical equipment. Vibration is an inevitable phenomenon in mechanical operation. It has a great impact on the yield rate and the accuracy of test results in the field of manufacturing or testing with high precision requirements. In order to reduce or even suppress this phenomenon, there are currently a variety of methods. Among them, active vibration reduction can automatically intervene in response to loads of different sizes. Active plus passive vibration control, which supplements passive vibration reduction, is a method that has been proven to have a good vibration reduction effect.

[0003] However, the current problems of active and passive vibration reduction devices include: 1. Trapped in the working scene, it is impossible to use the scene with high flexibility requirements. 2. The supporting equipment is complicated, and most of them require an external power supply or other energy storage devices. 3. There are many adverse effects in the working process, such as heat generation and noise. At present, the main methods to solve the above problems include: using a piezoelectric block structure with a high degree of integration as an active vibration reduction element to reduce the overall volume of the vibration reduction device; integrating a piezoelectric energy storage system with a piezoelectric ceramic sheet as the main body inside the vibration reduction device to solve the dependence of the vibration reduction device on an external power supply, and processing heat dissipation ribs and other structures inside the vibration reduction device to reduce the heating problem. Although these methods can solve the above problems to a certain extent, they introduce new problems such as the difficulty of piezoelectric system design, high cost, and the increase in the volume of the vibration reduction device caused by processing the heat dissipation ribs. Therefore, there is a need for a self-powered closed-loop vibration control device based on the magnetothermal power generation effect, which can ensure a good vibration reduction effect without the help of an external power supply, can be self-powered, and fully utilizes energy, and has a simple structure. Summary of the invention

[0004] The purpose of the present 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 above-mentioned prior art. It does not require an external power supply and can be self-powered. It also utilizes the combination of active vibration reduction and passive vibration reduction to improve the vibration reduction effect, make full use of energy, and has a simple structure.

[0005] To achieve the above object, the present invention provides the following solutions:

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

[0007] A solenoid, the solenoid being arranged between the solenoid placement platform and the magnetic shell, the magnetic shell being able to penetrate into the solenoid and being able to move up and down relative to the solenoid under the action of the object to be damped to generate heat energy;

[0008] A passive vibration reduction device, the passive vibration reduction device comprising an elastic member, the elastic member is arranged between the magnetic shell and the placement platform of the solenoid, and the two ends of the elastic member are respectively connected to the placement platform and the magnetic shell, and the elastic member can be compressed in the vertical direction;

[0009] A temperature difference power generation device, the temperature difference power generation device is connected to the magnetic shell and is used to convert the heat energy generated by the magnetic shell into electrical energy;

[0010] An active vibration reduction device, wherein the active vibration reduction device comprises a driving device, wherein the driving device is electrically connected to the temperature difference power generation device and is connected to the magnetic shell, and the driving device can provide a force to prevent the movement tendency of the magnetic shell.

[0011] Preferably, it also includes a shell, which can accommodate the magnetic shell, and the shell is used to accommodate the solenoid. The magnetic shell includes a carrying platform and an annular shell. The annular shell is made of paramagnetic material. The carrying platform is fixedly arranged on the top of the annular shell and is used to carry the object to be damped. The end of the elastic member away from the shell is connected to the bottom of the carrying platform.

[0012] Preferably, the elastic member includes a spring, and the spring is sleeved on a fixed shaft, the bottom of the fixed shaft is fixedly set on the bottom surface of the shell, and the top is set through the supporting platform, both ends of the spring are fixedly connected with a first spring seat, the first spring seats at both ends are respectively fixedly connected to the bottom surface of the shell and the supporting platform, and 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 sections.

[0013] Preferably, it further comprises a lower end protrusion, wherein the first end of the lower end protrusion has threads and is fixedly connected to the bottom surface of the shell through the threads, and the second end is fixedly connected to the first spring seat.

[0014] Preferably, the temperature difference power generation device includes a temperature difference generator, a cold contact surface and a hot contact surface, the hot contact surface is tightly fitted with the inner wall of the annular shell and fixed to the bottom surface of the supporting platform, the cold contact surface is fixedly connected to the bottom of the outer shell, and the temperature difference generator is arranged between the cold contact surface and the hot contact surface and fits the cold contact surface and the hot contact surface.

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

[0016] Preferably, a restoring spring is further included, wherein the restoring spring is sleeved outside the driving device, and two ends of the restoring spring are respectively in contact with the bottom of the bearing platform and the bottom surface of the shell.

[0017] Preferably, it also includes a base, a supplementary solenoid and a supplementary solenoid shell, the supplementary solenoid is placed in the supplementary solenoid shell through a threaded groove, the supplementary solenoid shell is rotatably connected to the bottom of the base through a spiral connection device, the top of the base is the bottom surface of the shell, and the supplementary solenoid shell and the base are both provided with grooves for the supplementary solenoid to pass through, and the supplementary solenoid can enter or exit the shell by rotating the spiral connection device.

[0018] Preferably, 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, and the inclination direction of the wedge surface of the wedge-shaped plate is the same as the rotation direction of the supplementary solenoid, which is used to prevent the solenoid from backing off.

[0019] Preferably, it also includes a force sensor and a controller, wherein the force sensor is arranged below the supporting platform to sense the force applied to the supporting platform, and 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] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The top of the magnetic shell of the present invention is used to carry the object to be damped, the solenoid is arranged between the solenoid placement platform and the magnetic shell, 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 to generate heat energy, the passive vibration reduction device includes an elastic member, the elastic member is arranged between the magnetic shell and the placement platform of the solenoid, and the two ends of the elastic member are respectively connected to the placement platform and the magnetic shell, the elastic member can be compressed in the vertical direction, the temperature difference power generation device is connected to the magnetic shell, and is used to convert the heat energy generated by the magnetic shell into electrical energy, the active vibration reduction device includes a driving device, the driving device is electrically connected to the temperature difference power generation device, and is connected to the magnetic shell, and the driving device can provide a force to prevent the movement trend of the magnetic shell. Passive vibration reduction is combined with active vibration reduction. Passive vibration reduction is achieved by compressing the elastic parts in the vertical direction. It can effectively cope with conventional vibration impacts and provide preliminary protection for the object to be reduced. The driving device in the active vibration reduction device can perform more precise vibration control according to actual conditions, further improve the vibration reduction effect, and ensure the stability of the object to be reduced. The magnetic shell moves up and down in the solenoid to generate heat energy. The temperature difference power generation device converts this heat energy into electrical energy to achieve energy recovery and utilization, reduce the system's dependence on external energy, and improve energy utilization efficiency. The recovered electrical energy is used to power the driving device of the active vibration reduction device without the need for an external power supply, forming a benign energy closed-loop circulation system that can achieve self-power supply and has a relatively simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It 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 A top view of a self-powered closed-loop vibration control device based on magnetothermal power generation effect in some embodiments of the present invention;

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

[0026] Figure 4 The overall structure diagram of the passive vibration reduction device in some embodiments of the present invention is

[0027] Figure 5 A structural diagram of a device for performing temperature difference power generation using magnetocaloric effect in some embodiments of the present invention;

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

[0029] Figure 7 It is a structural diagram of a solenoid back-up prevention device in a base in some embodiments of the present invention;

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

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

[0032] Fig.10 The second part of the principle diagram of the self-powered closed-loop vibration control device based on the magnetothermal power generation effect in some embodiments of the present invention;

[0033] Fig.11 The following is a comparison of the transmission rate curves of a general vibration absorber 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 reduction device; 101-spring; 102-first spring seat; 103-second spring seat; 104-lower end protrusion; 2-thermal difference power generation device; 201-cold contact surface; 202-thermal difference generator; 203-hot contact surface; 3-housing; 4-base; 5-supplementary solenoid shell; 501-supplementary solenoid; 502-spiral connection device; 6-voice coil motor; 7-restoration spring; 8-solenoid; 9-anti-backward device; 10-conducting wire; 11-magnetic shell; 1101-carrying platform; 1102-ring shell; 12-force sensor; 13-controller; 14-fixing pin; 15-solenoid baffle. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The purpose of the present 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 aid of an external power supply, and utilizes the combination of active vibration reduction and passive vibration reduction to improve the vibration reduction effect, make full use of energy, and has a simple structure.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1-Figure 11 As shown, the present invention provides a self-powered closed-loop vibration control device based on magnetothermal power generation effect, comprising a magnetic shell 11, a passive vibration reduction device 1, a solenoid 8, a temperature difference power generation device 2 and an active vibration reduction device. The top of the magnetic shell 11 is used to carry the object to be damped, the solenoid 8 is arranged between the solenoid placement platform and the magnetic shell 11, the magnetic shell 11 can be inserted into the solenoid 8, and can move up and down relative to the solenoid 8 under the action of the object to be damped, so that the solenoid 8 can generate an induced current. At this time, the magnetic shell 11 cuts the magnetic flux lines of the magnetic field generated by the solenoid 8, and the magnetic shell 11 generates heat energy. The passive vibration reduction device includes an elastic member, which is arranged between the magnetic shell 11 and the placement platform of the solenoid 8, and the two ends of the elastic member are respectively connected to the placement platform and the magnetic shell. 11, the elastic member can be compressed in the vertical direction, the temperature difference power generation device 2 is connected to the magnetic shell 11, and is used to convert the heat energy generated by the magnetic shell 11 into electrical energy. The active vibration reduction device includes a driving device, which is electrically connected to the temperature difference power generation device 2 and to the magnetic shell 11. The driving device can provide a force to prevent the movement trend of the magnetic shell 11, that is, when the magnetic shell 11 is pressed down by the object to be damped, the driving device can provide an upward force, and when the magnetic shell 11 is lifted up by the object to be damped, the driving device can provide a downward pulling force. The driving device is used for active vibration reduction. When passive vibration reduction is not enough to completely suppress vibration, the driving device is operated to achieve active vibration reduction; the passive vibration reduction device 1 is mainly used for passive vibration reduction. When the vibration level is not enough to trigger active vibration reduction, the magnetic shell 11 performs vibration reduction.

[0038] Passive vibration reduction is combined with active vibration reduction. Passive vibration reduction is achieved by compressing the elastic member in the vertical direction. It can effectively deal with conventional vibration impacts and provide preliminary protection for the object to be damped. The driving device in the active vibration reduction device can perform more accurate vibration control according to actual conditions, further improve the vibration reduction effect, and ensure the stability of the object to be damped. The magnetic shell 11 moves up and down in the solenoid to generate heat energy. The temperature difference power generation device 2 converts this heat energy into electrical energy to achieve energy recycling, reduce the system's dependence on external energy, and improve energy utilization efficiency. The recycled electrical energy is used to power the driving device of the active vibration reduction device without an external power supply, forming a benign energy closed-loop circulation system that can achieve self-power supply. The shell 3 can accommodate the magnetic shell 11. This design makes the device compact and occupies a small space, which is easy to install and use in various scenarios. The shell 3 can isolate external interference and prevent heat dissipation, reducing energy loss. The magnetic shell 11 can move up and down relative to the solenoid, can adapt to vibrations of different amplitudes and frequencies, has a wide range of applicability, and has 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 a magnetic shell 11, and the housing 3 is used to accommodate a solenoid 8, and the magnetic shell 11 includes a carrying platform 1101 and an annular shell 1102, and the annular shell 1102 is made of paramagnetic material, and the carrying platform 1101 is fixedly arranged on the top of the annular shell 1102, and is used to carry the object to be damped, and the end of the elastic member away from the housing 3 is connected to the bottom of the carrying platform 1101. The surface of the carrying platform 1101 is a smooth plane, and the vibration reduction target workpiece can be fixed to the carrying platform 1101 by a standard clamping device, or the workpiece can be connected to the carrying platform 1101 by applying adhesive, wax, etc. on the platform surface and the bottom of the workpiece.

[0040] Paramagnetic materials are mainly used to generate heat energy through magnetocaloric effect. Magnetocaloric effect refers to the temperature change of magnetic materials when the external magnetic field changes. Magnetization increases the number of parallel magnets in the magnetic body. At the same time, the exchange interaction energy and the static magnetic energy in the external magnetic field decrease. The reduced part is converted into heat energy, which increases the temperature of the entire magnet. Paramagnetic materials are materials whose magnetic susceptibility is closely related to temperature, including salts of rare earth metals and iron elements. In paramagnetic materials, the electrons in the atoms spin in a way with permanent dipole moments. Due to thermal motion, the direction of these moments is random. When paramagnetic materials are placed in an external magnetic field, the tiny magnetic dipoles will be arranged along the direction of the magnetic field and magnetized. Therefore, paramagnetic materials are selected as the main body of magnetocaloric effect.

[0041] In some embodiments, the elastic member includes a spring 101, and the spring 101 is sleeved on a fixed shaft, the bottom of the fixed shaft is vertically arranged on the bottom surface of the housing 3, and the top is arranged through the bearing platform 1101, both ends of the spring 101 are fixedly connected with a first spring seat 102, and the first spring seats 102 at both ends are respectively fixedly connected to the bottom surface of the housing 3 and the bearing platform 1101, and a second spring seat 103 is slidably sleeved between the two ends of the spring 101, and the second spring seat 103 can divide the spring into two sections, increasing the range of variation of the elastic coefficient of the spring 101, so that the spring 101 can be adaptively adjusted according to different vibration intensities and frequencies, and when the vibration is small, the spring 101 can work in a softer state, providing a softer vibration reduction effect; when the vibration is large, the second spring seat 103 will compress the spring 101, making the spring 101 harder, so that it can withstand greater impact force and improve the vibration reduction effect. The sliding design of the second spring seat 103 allows the spring 101 to be more evenly stressed during operation. When vibration occurs, the second spring seat 103 adjusts its position according to the stress of the spring 101, so that the stress of each part of the spring 101 is more balanced, avoiding the spring 101 from being damaged due to excessive local stress, 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 are evenly arranged along the axial direction of the magnetic shell 11 to evenly bear the external force; it should also be noted that the springs 101 can also be slightly tilted, and in certain cases, when the springs are tilted, the force in the vibration direction can be decomposed. For example, when there is an oblique vibration impact, the inclined spring can simultaneously reduce the vertical and horizontal forces.

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

[0044] In some embodiments, the thermoelectric power generation device 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 carrier platform 1101. The cold contact surface 201 is fixedly connected to the bottom of the shell 3. The thermoelectric generator 202 is arranged between the cold contact surface 201 and the hot contact surface 203 and is 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 of paramagnetic material and is jointly fixed to the lower surface of the carrier platform 1101. The annular shell 1102 of paramagnetic material surrounds the outer surface of the hot contact surface 203, is closer to the solenoid, has a more significant magnetocaloric effect, and generates more heat during vibration, thereby being able to generate more electrical energy. Thermoelectric generator 202 is mainly used to utilize the magnetocaloric effect of paramagnetic materials. When the paramagnetic materials generate heat, the temperature is transferred to the temperature difference formed by the hot contact surface 203 and the cold contact surface 201 to generate electricity, and the heat energy generated by the magnetocaloric effect is converted into electrical energy. The principle of thermoelectric generator 202 is to utilize the Seebeck effect, that is, a p-type and an n-type thermoelectric element are connected with electrodes on the hot contact surface, and the cold contact surface electrodes are respectively connected on the cold contact surface to form a thermoelectric monomer.

[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 carrier platform 1101, and the voice coil motor 6 is electrically connected to the temperature difference generator 202 through the wire 10. The voice coil motor 6 has extremely high positioning accuracy and response speed, and can accurately control the movement of the carrier platform 1101, thereby achieving accurate vibration reduction of the object to be reduced, and can quickly adjust the position of the carrier platform 1101 according to different vibration conditions to ensure that the object to be reduced is always in a stable state. It can also make timely and effective responses to tiny vibrations, providing reliable protection for vibration reduction of high-precision equipment. In addition, the voice coil motor 6 usually has a small size and light weight, which will not add too much burden to the entire vibration control device, making the device more compact and portable, and 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 also includes a restoring spring 7, which is sleeved with a driving device, and its two ends are respectively abutted against the bottom of the bearing platform 1101 and the bottom surface of the housing 3. Specifically, it can be installed between the bearing platform 1101 and the bottom surface of the housing 3 by welding or slots. When vibration occurs, the driving device (such as the voice coil motor 6) is mainly used to actively control the position of the bearing platform 1101 to reduce vibration, and the restoring spring 7, as an auxiliary component, can provide additional elastic restoring force when the bearing platform 1101 is displaced by vibration. For example, when the bearing platform 1101 moves downward, the restoring spring 7 is compressed, generating an upward elastic force to help the bearing platform 1101 return to the equilibrium position faster, which is combined with the active control of the driving device to provide a double guarantee and enhance the vibration suppression capability of the entire device.

[0047] In some embodiments, the self-powered closed-loop vibration control device based on the magnetothermal power generation effect further includes a base 4, a supplementary solenoid and a supplementary solenoid shell 5. The supplementary solenoid 501 is placed in the supplementary solenoid shell 5 through a thread groove. The supplementary solenoid shell 5 is connected to the bottom of the base 4 through a spiral connection device 502. The spiral connection device 502 has a rectangular thread and can be rotated in situ. The top of the base 4 is the bottom surface of the shell 3, and the supplementary solenoid shell 5 and the base 4 are both provided with a groove for the supplementary solenoid 501 to pass through. The supplementary solenoid 501 can enter or exit the shell 3 by rotating the spiral connection device 502. The supplementary solenoid shell 5 surrounds 20 turns of the solenoid, which can be added to the inside of the vibration reduction 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 magnetothermal effect, increasing the temperature difference power generation current, and achieving a higher intensity of active vibration reduction. 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 also includes an anti-backward baffle 9, which is preferably six evenly arranged. The anti-backward baffle 9 is a wedge-shaped plate, which is fixed to the upper surface of the base 4 by a fixing pin 14. The inclination direction of the wedge surface of the wedge-shaped plate is the same as the rotation direction of the supplementary solenoid 501, which is used to prevent the solenoid from backing up. The anti-backward baffle 9 is made of a resin material with a certain strength and is made into a wedge shape that conforms to the release direction of the solenoid, that is, counterclockwise rotation release. The solenoid is subject to very little resistance when rotating counterclockwise. When the solenoid has a tendency to return to the storage bin, that is, a counterclockwise rotation tendency, it is subject to greater resistance, thereby achieving the purpose of preventing backing up. The fixing pin 14 fixes the baffle to the upper surface of the base 4, and the top tightening force provides resistance to the anti-backward plate.

[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 arranged below the carrier platform 1101 to sense the force exerted on the carrier platform 1101. The force sensor 12 is a dynamic force sensor capable of detecting the change of 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 carrier platform 1101 is mainly used to calculate the logical axis displacement signal of the center of mass of the carrier platform 1101, and to 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 according to the logical axis displacement signal through the 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] It should also be noted that the passive vibration reduction device is a traditional spring-mass-damper unit, which realizes simple passive vibration reduction, and its transfer rate curve function G is:

[0051]

[0052] Where X1 is the vibration displacement of the load-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 load-bearing platform and the base, M is the mass of the load-bearing platform, s=jω is the complex variable of the Latten transformation, and ω is the frequency domain coefficient.

[0053] On the basis of the passive vibration reduction transposition, a voice coil motor powered by magnetothermal effect is added for active vibration reduction. Its active feedback control loop uses dynamic force sensor feedback, controller calculation and voice coil motor output mode operation. When the data collected by the dynamic force sensor exceeds the capacity range of passive vibration reduction, active vibration reduction is triggered to form an active and passive composite vibration reduction device. Its transfer rate curve function G0 in the open loop is:

[0054]

[0055] Where X2 is the vibration displacement of the load-bearing platform when active and passive composite vibration reduction is adopted, K0 is the stiffness of the restoring spring, K is the equivalent stiffness of the system, C is the equivalent damping of the system, M is the mass of the load-bearing platform, s=jω is the complex variable of the pull-type transformation, ω is the frequency domain coefficient, and the vibration signal on the load-bearing platform is used as a reference to actively control the passive vibration reduction unit (PI force feedback control algorithm is adopted in this embodiment) to form an active and passive composite vibration reduction unit, wherein the control force F is:

[0056]

[0057] Among them, the time domain formula of the proportional integral (PI) control algorithm is:

[0058]

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

[0060]

[0061] In the formula, k p is the proportional gain coefficient, k i 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 Lassen transform, and ω is the frequency domain coefficient.

[0062] Then the transfer rate curve function G of the active and passive composite vibration reduction device in the closed loop is c :

[0063]

[0064] like Fig.11 As shown, it can be clearly seen from the solid line in the figure that the natural frequency of the general vibration absorber is relatively large, and the resonance peak is relatively high, which shows that its vibration reduction effect is extremely limited and the coverage range is relatively small. The dotted line in the figure is the transmission rate curve of the solenoid turns of 20 in this embodiment, the dashed line in the figure is the transmission rate curve of the solenoid turns of 30 in this embodiment, and the dot-dash line in the figure is the transmission rate curve of the solenoid turns of 40 in this embodiment. It can be seen that with the increase of the number of solenoid turns, the vibration reduction effect of the self-powered closed-loop vibration control device based on the magnetothermal power generation effect in this embodiment continues to increase, the resonance suppression effect at the natural frequency is getting better and better, the system vibration amplitude is reduced, especially the natural frequency is extremely obviously shifted forward, and the range of the vibration reduction frequency band is also significantly increased.

[0065] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A self-powered closed-loop vibration control device based on magnetothermal power generation effect, characterized in that: It comprises a magnetic shell, the top of which is used to carry the object to be damped; A solenoid, the solenoid being arranged between the solenoid placement platform and the magnetic shell, the magnetic shell being able to penetrate into the solenoid and being able to move up and down relative to the solenoid under the action of the object to be damped to generate heat energy; A passive vibration reduction device, the passive vibration reduction device comprising an elastic member, the elastic member is arranged between the magnetic shell and the placement platform of the solenoid, and the two ends of the elastic member are respectively connected to the placement platform and the magnetic shell, and the elastic member can be compressed in the vertical direction; A temperature difference power generation device, the temperature difference power generation device is connected to the magnetic shell and is used to convert the heat energy generated by the magnetic shell into electrical energy; An active vibration reduction device, wherein the active vibration reduction device comprises a driving device, wherein the driving device is electrically connected to the temperature difference power generation device and is connected to the magnetic shell, and the driving device can provide a force to prevent the movement tendency of the magnetic shell.

2. The self-powered closed-loop vibration control device based on the magnetothermal power generation effect according to claim 1 is characterized in that: It also includes a shell, which can accommodate the magnetic shell, and the shell is used to accommodate the solenoid. The magnetic shell includes a carrying platform and an annular shell. The annular shell is made of paramagnetic material. The carrying platform is fixedly arranged on the top of the annular shell and is used to carry the object to be damped. The end of the elastic member away from the shell is connected to the bottom of the carrying platform.

3. The self-powered closed-loop vibration control device based on the magnetothermal power generation effect according to claim 2 is characterized in that: The elastic member includes a spring, and the spring is sleeved on a fixed shaft. The bottom of the fixed shaft is fixedly arranged on the bottom surface of the shell, and the top is arranged through the bearing platform. Both ends of the spring are fixedly connected with a first spring seat, and the first spring seats at both ends are respectively fixedly connected with the bottom surface of the shell and the bearing 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 sections.

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

5. The self-powered closed-loop vibration control device based on magnetothermal power generation effect according to claim 2, characterized in that: The temperature difference power generation device includes a temperature difference 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 supporting platform. The cold contact surface is fixedly connected to the bottom of the shell. The temperature difference generator is arranged between the cold contact surface and the hot contact surface and is attached to the cold contact surface and the hot contact surface.

6. The self-powered closed-loop vibration control device based on magnetothermal power generation effect according to claim 2, 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 carrying platform.

7. The self-powered closed-loop vibration control device based on magnetothermal power generation effect according to claim 2, characterized in that: It also includes a restoring spring, which is sleeved outside the driving device, and has two ends respectively abutting against the bottom of the bearing platform and the bottom surface of the shell.

8. The self-powered closed-loop vibration control device based on magnetothermal power generation effect according to claim 2, characterized in that: It also includes a base, a supplementary solenoid and a supplementary solenoid shell, the supplementary solenoid is placed in the supplementary solenoid shell through a threaded groove, the supplementary solenoid shell is rotatably connected to the bottom of the base through a spiral connection device, the top of the base is the bottom surface of the shell, and the supplementary solenoid shell and the base are both provided with grooves for the supplementary solenoid to pass through, and the supplementary solenoid can enter or exit the shell by rotating the spiral connection device.

9. The self-powered closed-loop vibration control device based on magnetothermal power generation effect according to claim 8, 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 inclination direction of the wedge surface of the wedge-shaped plate is the same as the rotation direction of the supplementary solenoid, and is used to prevent the solenoid from backing off.

10. The self-powered closed-loop vibration control device based on magnetothermal power generation effect according to claim 6, characterized in that: It also includes a force sensor and a controller. The force sensor is arranged below the supporting platform and is used to sense the force applied to the supporting 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.

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