Active vibration reduction method and device based on SMA

Abstract

The invention discloses an SMA-based active vibration reduction method and device, and relates to the field of shape memory alloys. Comprising the steps that an active vibration reduction system provided with a control center and a plurality of electrically-connected SMA driving microwires is built; receiving the vibration signal, detecting the resistance change of the SMA driving microfilament in the active vibration reduction system in real time, and generating a time-strain curve of the SMA driving microfilament based on the resistance-frequency-strain correlation of the SMA driving microfilament; based on a time-strain curve, determining vibration spectrum information of the vibration signal and feeding back the vibration spectrum information to a control center; wherein the vibration spectrum information comprises vibration amplitude, vibration frequency, phase and wavelength; and based on the vibration spectrum information, the control center controls to use pulse electric heating to drive the SMA driving microwire, a compensation vibration spectrum opposite to the vibration spectrum information is generated, and active damping is achieved. According to the invention, based on SMA driving microwires, vibration spectrum monitoring and damping active control are realized by combining high-frequency strain / stress control under a confrontation structure system and combining a feedback control algorithm.

Description

Technical Field

[0001] The present invention relates to the technical field of shape memory alloys, and particularly relates to an active vibration damping method and device based on SMA. Background Art

[0002] Vibration damping technology is widely used in industries such as transportation equipment and military equipment. It mainly reduces the vibration during the operation of mechanical equipment to achieve technical effects such as reducing noise, providing control accuracy, improving equipment stability and service life.

[0003] Shape memory alloys exhibit extremely large macroscopic reversible strains based on the reversible crystallographic shear accompanying thermoelastic martensitic transformation. Moreover, during stress-induced martensitic transformation and the reverse transformation during unloading, they exhibit a "hysteretic" stress-strain curve, endowing the material with superelasticity and vibration damping characteristics. Therefore, shape memory alloy devices can replace functional components such as linear motors, actuators, and strain sensor devices based on their material properties. In-depth research on the performance of shape memory alloy materials reveals that this material can be used to achieve vibration damping effects. For example, according to the deformation-recovery process of shape memory alloy materials, shape memory alloy materials can be classified as energy-absorbing materials and can be applied to passive vibration damping scenarios such as electrical equipment damping and building damping. When vibration occurs, vibration waves are absorbed to achieve vibration damping effects. The existing active vibration damping system is installed with vibration sensors and actuators on the basis of a passive vibration isolation system. The vibration sensor detects the vibration of the tabletop and then feeds it back to the control system. By applying a force in the opposite direction of the vibration to the tabletop, the vibration is offset, and active vibration damping can be implemented in the range of 0.7 Hz to 50 Hz. Based on the characteristics of shape memory alloys, the existing technology monitors the vibration spectrum of shape memory alloy motors, and the results show that the stroke, vibration frequency, and amplitude of the vibration spectrum can all be adjusted, that is, the vibration spectrum of shape memory alloy materials can be edited. Therefore, researchers have explored the application of shape memory alloy materials in active vibration damping scenarios. Summary of the Invention

[0004] The purpose of the present invention is to provide an active vibration damping method and device based on SMA, which utilizes SMA-driven microfilaments to achieve the integration of vibration spectrum monitoring, feedback, and compensated vibration spectrum control output, making the active vibration damping system more concise.

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

[0006] In the first aspect, an active vibration damping method based on SMA is proposed, including the following steps:

[0007] Build an active vibration damping system, in which several SMA-driven microfilaments are arranged, and the SMA-driven microfilaments are electrically connected to the control center of the active vibration damping system;

[0008] Receive vibration signals, detect the resistance change of the SMA-driven microfilament in the active vibration damping system in real time, and generate a time-strain curve of the SMA-driven microfilament based on the correlation between the resistance-frequency-strain of the SMA-driven microfilament;

[0009] Based on the time-strain curve, determine the vibration spectrum information of the vibration signal and feedback it to the control center; wherein, the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength;

[0010] Based on the vibration spectrum information, the control center controls the use of pulse electric heating to drive the SMA-driven microfilament to generate a compensation vibration spectrum that is out of phase with the vibration spectrum information for active damping.

[0011] Furthermore, the process by which the control center controls the use of pulse electric heating to drive the SMA-driven microfilament to generate a compensation vibration spectrum that is out of phase with the vibration spectrum information is as follows:

[0012] By controlling the current or PWM duty cycle of the pulse electric heating of the SMA-driven microfilament, the amplitude of the compensation vibration spectrum is regulated;

[0013] By controlling the resistance change of the pulse electric heating of the SMA-driven microfilament, the stroke of the SMA-driven microfilament is regulated;

[0014] By controlling the input frequency of the pulse electric heating of the SMA-driven microfilament, the output frequency of the compensation vibration spectrum is regulated.

[0015] Furthermore, the resistance change range of the SMA-driven microfilament is 130 - 160 Ω, and the driving stroke strain range of the SMA-driven microfilament is 0.035 - 3.0%; the current change range of the pulse electric heating is 0 - 100 mA, the input waveform is a sine wave, and the input frequency range is 0.7 - 200 Hz; the driving stroke is negatively correlated with the input frequency.

[0016] Furthermore, the vibration amplitude range of the compensation vibration spectrum that is out of phase with the vibration spectrum information generated by the active vibration damping system is 0.035 - 3.0%, the active vibration damping frequency range is 0.7 - 200 Hz, the reverse vibration frequency of the active vibration damping is consistent with the vibration frequency of the vibration signal, and the generated active damping phase is 180°.

[0017] Furthermore, the amplitude resolution of the active vibration damping system for the vibration signal is sub-micron level.

[0018] Furthermore, the radial dimension of the SMA-driven microfilament in the active vibration damping system is 30 - 76 μm.

[0019] In a second aspect, an active vibration damping device based on SMA is proposed, including:

[0020] An active vibration damping system, in which a control center and a number of SMA drive microfilaments are provided; among them, the SMA drive microfilaments are electrically connected to the control center of the active vibration damping system and are used to receive vibration signals;

[0021] A detection module, which is used to detect the real-time resistance change of the SMA drive microfilaments after receiving vibration signals, and generate a time-strain curve of the SMA drive microfilaments based on the correlation of the resistance-frequency-strain of the SMA drive microfilaments;

[0022] A determination and feedback module, which is used to determine the vibration spectrum information of the vibration signals based on the time-strain curve and feedback it to the control center, so that the control center controls the use of pulse electric heating to drive the SMA drive microfilaments based on the vibration spectrum information, generate a compensation vibration spectrum that is opposite in phase to the vibration spectrum information, and actively damp; among them, the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength.

[0023] Further, the process in which the control center in the determination and feedback module controls the use of pulse electric heating to drive the SMA drive microfilaments to generate a compensation vibration spectrum that is opposite in phase to the vibration spectrum information is as follows:

[0024] By controlling the current or PWM duty cycle of pulse electric heating of the SMA drive microfilaments, the amplitude of the compensation vibration spectrum is regulated;

[0025] By controlling the resistance change of pulse electric heating of the SMA drive microfilaments, the stroke of the SMA drive microfilaments is regulated;

[0026] By controlling the input frequency of pulse electric heating of the SMA drive microfilaments, the output frequency of the compensation vibration spectrum is regulated;

[0027] The resistance change range of the SMA drive microfilaments is 130 - 160 Ω, and the drive stroke strain range of the SMA drive microfilaments is 0.035 - 3.0%; the current change range of the pulse electric heating is 0 - 100 mA, the input waveform is a sine wave, and the input frequency range is 0.7 - 200 Hz; the drive stroke is negatively correlated with the input frequency.

[0028] Further, the vibration amplitude range of the compensation vibration spectrum that is opposite in phase to the vibration spectrum information generated by the determination and feedback module is 0.035 - 3.0%, the active vibration damping frequency range is 0.7 - 200 Hz, the reverse vibration frequency of the active vibration damping is the same as the vibration frequency of the vibration signal, and the generated active damping phase is 180°.

[0029] Furthermore, the radial dimension of the SMA-driven microfilaments in the active vibration damping system is 30 - 76 μm.

[0030] As can be seen from the above technical solutions, the technical solutions of the present invention have obtained the following beneficial effects:

[0031] The SMA-based active vibration damping method and device disclosed in the present invention include the following steps: building an active vibration damping system, in which a number of SMA-driven microfilaments are arranged, and the SMA-driven microfilaments are electrically connected to the control center of the active vibration damping system; receiving vibration signals, detecting the resistance change of the SMA-driven microfilaments in the active vibration damping system in real time, and generating a time-strain curve of the SMA-driven microfilaments based on the correlation of resistance-frequency-strain of the SMA-driven microfilaments; determining the vibration spectrum information of the vibration signals based on the time-strain curve and feeding it back to the control center; wherein the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength; based on the vibration spectrum information, the control center controls the use of pulsed electric heating to drive the SMA-driven microfilaments to generate a compensation vibration spectrum that is out of phase with the vibration spectrum information, for active damping. The present invention combines high-frequency strain / stress control under an anti-structure system based on SMA-driven microfilaments and combines a feedback control algorithm to achieve vibration spectrum monitoring and active damping control.

[0032] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts do not contradict each other.

[0033] The foregoing and other aspects, embodiments, and features of the teachings of the present invention can be more fully understood from the following description taken in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or will be learned through practice of the specific embodiments according to the teachings of the present invention. Description of the Drawings

[0034] The drawings are not drawn to scale in accordance with real reference objects. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the drawings, wherein:

[0035] Figure 1 is a flowchart of the SMA-based active vibration damping method disclosed in this embodiment;

[0036] Figure 2 is a block diagram of the composition of the SMA-based active vibration damping device disclosed in this embodiment;

[0037] Figure 3Time-resistance curve of the SMA-driven microfilament detected in Example 1;

[0038] Figure 4 Time-strain curve of the vibration signal calculated by the control center in Example 1;

[0039] Figure 5 Time-current curve of the tensile pulse current for compensating vibration in Example 1;

[0040] Figure 6 Expected amplitude of the tensile compensation vibration and the vibration curve after actual compensation in Example 1. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains.

[0042] The terms "first", "second" and similar terms used in the specification and claims of this patent application of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms "a", "an" or "the" and similar terms do not denote a limitation of quantity, but mean that there is at least one. The terms "comprising" or "including" and similar terms are intended to mean that the elements or items appearing before "comprising" or "including" cover the features, wholes, steps, operations, elements and / or components listed after "comprising" or "including", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0043] Through the study of shape memory alloy materials, it is found that the hysteretic stress-strain curve accompanying the stress-induced martensitic transformation and the reverse transformation during unloading can bring excellent damping and vibration reduction characteristics; therefore, the present invention aims to apply this characteristic to propose an SMA-based active vibration reduction method and device for monitoring the vibration spectrum and realizing active damping according to the monitored vibration spectrum.

[0044] Specifically, the SMA-based active vibration damping method includes the following steps: Step S102, build an active vibration damping system, in which several SMA drive microfilaments are arranged, and the SMA drive microfilaments are electrically connected to the control center of the active vibration damping system;

[0045] Step S104, receive vibration signals, detect the resistance change of the SMA drive microfilaments in the active vibration damping system in real time, and generate a time-strain curve of the SMA drive microfilaments based on the correlation between the resistance-frequency-strain of the SMA drive microfilaments; The amplitude resolution of the active vibration damping system for the vibration signals is sub-micron level, which is related to the wire diameter of the SMA drive microfilaments. Therefore, in this case, SMA drive microfilaments with a conditional radial dimension of 30-76 μm are selected. In this solution, it is set that the frequency of the vibration signals that the active vibration damping system can receive reaches at least 1 kHz, and the signal delay <1 ms.

[0046] Step S106, based on the time-strain curve, determine the vibration spectrum information of the vibration signals and feedback it to the control center; Among them, according to the correlation between the resistance (R), frequency (f) and strain (ε) of the shape memory alloy microfilaments: ε = c + a 1 f + b 1 R + a 2 f 2 + b 2 R 2 , where c, a 1 , b 1 , a 2 and b 2 are all constant parameters, and this relationship can determine the vibration amplitude of the detected vibration signals; the constant parameters are calibrated according to material tests, and the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength. The calculation principle of the correlation between the resistance-frequency-strain of the SMA drive microfilaments is as follows: Since the SMA drive strain is controlled by the phase change process, the resistance of the two-phase structures before and after the phase change is different, so the phase change strain can be reflected according to the resistance; In addition, since the phase change strain will decrease when the frequency increases, and the phase change volume of the material will also decrease at high frequencies, adding a negatively correlated frequency-related term can control the prediction of strain through resistance at high frequencies; the constant parameters are obtained by fitting the experimental results of the current range, resistance range and strain at different frequencies on the SMA tensile test platform.

[0047] Step S108, based on the vibration spectrum information, the control center controls the use of pulsed electric heating to drive the SMA drive microfilaments, generates a compensation vibration spectrum that is out of phase with the vibration spectrum information, and can perform active damping in the frequency range of 0.7-200 Hz.

[0048] Among them, the process in which the control center controls the use of pulse electric heating to drive the SMA drive microfilament to generate a compensation vibration spectrum that is out of phase with the vibration spectrum information is as follows:

[0049] By controlling the current or PWM duty cycle of the pulse electric heating of the SMA drive microfilament, the amplitude of the compensation vibration spectrum is regulated; by controlling the resistance change of the pulse electric heating of the SMA drive microfilament, the stroke of the SMA drive microfilament is regulated; by controlling the input frequency of the pulse electric heating of the SMA drive microfilament, the output frequency of the compensation vibration spectrum is regulated. The specific control parameters are as follows: the resistance change range of the SMA drive microfilament is 125 - 165 Ω, the drive stroke strain range of the SMA drive microfilament is 0.035 - 3.0%; the current change range of the pulse electric heating is 0 - 100 mA, the input waveform is a sine wave, and the input frequency range is 0.7 - 200 Hz; the drive stroke is negatively correlated with the input frequency.

[0050] The present invention also proposes an active vibration damping device based on SMA, which includes: an active vibration damping system, in which a control center and several SMA drive microfilaments are provided; among them, the radial dimension of the SMA drive microfilament is 30 - 76 μm, and it is electrically connected to the control center of the active vibration damping system for receiving vibration signals; a detection module for detecting the real-time resistance change of the SMA drive microfilament after receiving the vibration signal, and generating a time-strain curve of the SMA drive microfilament based on the correlation between the resistance-frequency-strain of the SMA drive microfilament; a determination feedback module for determining the vibration spectrum information of the vibration signal based on the time-strain curve and feeding it back to the control center, so that the control center controls the use of pulse electric heating to drive the SMA drive microfilament based on the vibration spectrum information to generate a compensation vibration spectrum that is out of phase with the vibration spectrum information for active damping; among them, the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength.

[0051] Among them, in the process that the control center in the determination feedback module controls the use of pulse electric heating to drive the SMA drive microfilament based on the vibration spectrum information and generates a compensation vibration spectrum that is out of phase with the vibration spectrum information: by controlling the current or PWM duty cycle of the pulse electric heating of the SMA drive microfilament, the amplitude of the compensation vibration spectrum is regulated; by controlling the resistance change of the pulse electric heating of the SMA drive microfilament, the stroke of the SMA drive microfilament is regulated; by controlling the input frequency of the pulse electric heating of the SMA drive microfilament, the output frequency of the compensation vibration spectrum is regulated; the specific parameters are that the resistance change range of the SMA drive microfilament is 125 - 165 Ω, and the drive stroke strain range of the SMA drive microfilament is 0.035 - 3.0%; the current change range of the pulse electric heating is 0 - 100 mA, the input waveform is a sine wave, and the input frequency range is 0.7 - 200 Hz; the drive stroke is negatively correlated with the input frequency.

[0052] In addition, the vibration amplitude range of the compensation vibration spectrum that is out of phase with the vibration spectrum information generated by the determination feedback module is 0.035 - 3.0%, the amplitude resolution is sub - micron level, the active vibration damping frequency range is 0.7 - 200 Hz, the reverse vibration frequency of the active vibration damping is consistent with the vibration frequency of the vibration signal, and the generated active damping phase is 180°.

[0053] The above - mentioned device realizes the high - frequency strain / stress control of the SMA drive microfilament under the anti - structure system. Combining with the feedback control algorithm, it realizes vibration spectrum monitoring and active damping control, not only simplifies the active vibration damping system, but also has a higher resolution of the detectable vibration spectrum and a wider frequency range for active damping.

[0054] Next, combined with specific embodiments and drawings, the active vibration damping method and device based on SMA disclosed in the present invention will be further specifically introduced.

[0055] Embodiment 1: Take the active vibration damping with a vibration frequency of 10 Hz and a strain of 0.95% of the vibration signal as an example

[0056] As Figure 3 shown, it is detected that the resistance change range of the SMA drive microfilament in the active vibration damping system is 132.0 - 138.3 Ω, and the vibration frequency is 10 Hz. According to the correlation of resistance - frequency - strain ε = c + a 1 f + b 1 R + a 2 f 2 + b 2 R 2 , the constant parameters are calibrated according to material experiments, c = - 358.5, a 1 = - 0.306, b 1 = 5.18, a 2= 0.0164, b 2 = -0.01861; According to the time-strain feedback algorithm control model, the time-strain curve of the SMA-driven microfilament is generated, and the actual vibration amplitude of the detected vibration signal is calculated to be -0.23 to 0.72%. The length of the SMA-driven microfilament used in the case is 115 mm, the radial dimension is 50 μm, and the vibration displacement amplitude is -0.26 to 0.83 mm. Its vibration spectrum is as Figure 4 shown.

[0057] By applying pulsed electricity to the active vibration damping system containing the SMA-driven microfilament, the SMA-driven microfilament in the active vibration damping system includes at least two and is arranged in a double-filament counter structure. By alternately heating and cooling the SMA-driven microfilament, the compensated vibration of the tension mode is realized, and a compensated vibration spectrum is generated. The current change range of pulsed electricity heating is 19 to 70 mA, and the time-current curve is as Figure 5 shown; By applying the compensated vibration in the opposite phase, the active damping is realized, and finally the active vibration damping effect of reducing the -0.23 to 0.72% movement to 0.008% is achieved. The vibration damping result is as Figure 6 shown.

[0058] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to what is defined by the claims.

Claims

1. An active vibration reduction method based on SMA, characterized in that: The steps include: Building an active vibration reduction system, wherein a plurality of SMA drive microwires are arranged in the active vibration reduction system, and the SMA drive microwires are electrically connected to a control center of the active vibration reduction system; Receive vibration signals, detect the resistance change of the SMA drive microwire in the active vibration reduction system in real time, and generate a time-strain curve of the SMA drive microwire based on the correlation between the resistance-frequency-strain of the SMA drive microwire; Based on the time-strain curve, the vibration spectrum information of the vibration signal is determined and fed back to the control center; wherein the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength; Based on the vibration spectrum information, the control center controls the use of pulse electric heating to drive the SMA drive microwire to generate a compensating vibration spectrum that is inversely proportional to the vibration spectrum information and actively damps.

2. The SMA-based active vibration reduction method according to claim 1, characterized in that: The process in which the control center controls the SMA drive microwire using pulse electric heating to generate a compensation vibration spectrum that is inversely proportional to the vibration spectrum information is as follows: The amplitude of the compensation vibration spectrum is regulated by controlling the current or PWM duty cycle of the pulsed electric heating of the SMA driving microwire; By controlling the resistance change of the SMA driving microwire by pulse electric heating, the stroke of the SMA driving microwire is regulated; The output frequency of the compensation vibration spectrum is regulated by controlling the input frequency of the pulse electric heating of the SMA driving microwire.

3. The SMA-based active vibration reduction method according to claim 2, characterized in that: The resistance variation range of the SMA driving microwire is 125-165Ω, and the driving stroke strain range of the SMA driving microwire is 0.035-3.0%; the current variation range of the pulse electric heating is 0-100mA, the input waveform is a sine wave, and the input frequency range is 0.7-200Hz; the driving stroke is negatively correlated with the input frequency.

4. The SMA-based active vibration reduction method according to claim 1, characterized in that: The vibration amplitude range of the compensation vibration spectrum of the vibration spectrum information generated by the active vibration reduction system is 0.035-3.0%, the frequency range of active vibration reduction is 0.7-200 Hz, the reverse vibration frequency of active vibration reduction is consistent with the vibration frequency of the vibration signal, and the generated active damping phase is 180°.

5. The SMA-based active vibration reduction method according to claim 1, characterized in that: The active vibration reduction system has an amplitude resolution of the vibration signal at sub-micron level.

6. The SMA-based active vibration reduction method according to claim 1, characterized in that: The radial size of the SMA driving microwire in the active vibration reduction system is 30-76 μm.

7. An active vibration reduction device based on SMA, characterized in that: include: An active vibration reduction system, wherein a control center and a plurality of SMA drive microwires are provided in the active vibration reduction system; wherein the SMA drive microwires are electrically connected to the control center of the active vibration reduction system for receiving vibration signals; A detection module, used to detect the real-time resistance change of the SMA drive microwire after receiving the vibration signal, and generate a time-strain curve of the SMA drive microwire based on the correlation between the resistance-frequency-strain of the SMA drive microwire; A feedback module is determined, which is used to determine the vibration spectrum information of the vibration signal based on the time-strain curve and feed it back to the control center, so that the control center controls the use of pulse electric heating to drive the SMA drive microwire based on the vibration spectrum information to generate a compensating vibration spectrum that is inversely proportional to the vibration spectrum information and actively damp; wherein the vibration spectrum information includes vibration amplitude, vibration frequency, phase and wavelength.

8. The SMA-based active vibration reduction device according to claim 7, characterized in that: The process of the control center in the determination feedback module controlling the use of pulse electric heating to drive the SMA drive microwire based on the vibration spectrum information to generate a compensation vibration spectrum that is inversely proportional to the vibration spectrum information is as follows: The amplitude of the compensation vibration spectrum is regulated by controlling the current or PWM duty cycle of the pulsed electric heating of the SMA driving microwire; By controlling the resistance change of the SMA driving microwire by pulse electric heating, the stroke of the SMA driving microwire is regulated; By controlling the input frequency of the pulse electric heating of the SMA driving microwire, the output frequency of the compensation vibration spectrum is regulated; The resistance variation range of the SMA driving microwire is 125-165Ω, and the driving stroke strain range of the SMA driving microwire is 0.035-3.0%; the current variation range of the pulse electric heating is 0-100mA, the input waveform is a sine wave, and the input frequency range is 0.7-200Hz; the driving stroke is negatively correlated with the input frequency.

9. The SMA-based active vibration reduction device according to claim 7, characterized in that: The vibration amplitude range of the compensation vibration spectrum of the vibration spectrum information generated by the determination feedback module is 0.035-3.0%, the frequency range of active vibration reduction is 0.7-200 Hz, the reverse vibration frequency of active vibration reduction is consistent with the vibration frequency of the vibration signal, and the generated active damping phase is 180°.

10. The SMA-based active vibration reduction device according to claim 7, characterized in that: The radial size of the SMA driving microwire in the active vibration reduction system is 30-76 μm.

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