Hybrid magneto-rheological elastomer semi-active tuned mass damper and principle

Abstract

The application provides a mixed magneto-rheological elastomer semi-active tuned mass damper and principle, wherein the damper comprises a shell, a magnetic conductor assembly arranged in the shell and a first magneto-rheological elastomer, and a connecting plate is arranged at the middle part of the shell; the magnetic conductor assembly comprises a telescopic magnetic conductor which is symmetrically arranged above and below the connecting plate, one end of the telescopic magnetic conductor is provided with a cantilever which is symmetrically arranged along the center of the telescopic magnetic conductor, the cantilever is arranged close to the connecting plate, the first magneto-rheological elastomer is arranged between the cantilever and the connecting plate, and piezoelectric stack drivers are arranged on both sides of the telescopic magnetic conductor and between the cantilever and the shell. The damper of the application can obtain a wider working frequency band, the shear storage modulus of the MRE is dynamically adjusted by the static magnetic force magnetic field and the dynamic adjustment of the voltage on the piezoelectric stack, and the dynamic adjustment of the TMD stiffness is realized.

Description

Technical Field

[0001] This invention belongs to the field of structural vibration control technology, specifically to a hybrid magnetorheological elastomer semi-active tuned mass damper and its principle. Background Technology

[0002] Structural vibration control is a widely applied engineering problem. With the development of modern industry and the advancement of engineering technology, structures are becoming larger and more flexible, while their working environments are becoming more diverse and complex. Existing technologies enhance the seismic resistance of structures by increasing component size and improving material strength. However, these methods are not only poorly adaptable to random vibrations and have limited protection targets, but also significantly increase structural costs, leading to increasingly prominent vibration problems. Therefore, structural vibration control has become a crucial and challenging issue.

[0003] Tuned mass dampers (TMDs) are widely used in passive vibration control. A major drawback of nitrogen-based TMDs is that their vibration reduction effect is significantly affected by the natural frequency of the main structure. TMDs are primarily designed for a specific natural frequency or a narrow frequency range. When the external excitation bandwidth is wide, the vibration reduction effect is not very significant, and the stiffness and damping of the structure will change during use. This results in poor vibration reduction performance from optimized TMDs, highlighting the frequency tuning sensitivity of TMDs.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The primary objective of this invention is to provide a hybrid magnetorheological elastomer (MRE) semi-actively tuned mass damper. By adjusting the placement of the MRE, it works in conjunction with a stretchable magnetic conductor and is positioned in the middle of the housing, thereby achieving a wider operating frequency band. The shear modulus of the MRE is dynamically adjusted by the voltage-controlled compressive strain on the piezoelectric stack through static magnetic field and dynamic adjustment, thus realizing dynamic adjustment of the TMD stiffness.

[0006] The second objective of this invention is to provide a semi-active tuned mass damping principle for magnetorheological elastomers. This method employs a combined control strategy, using tuning control to adjust the shear storage modulus of the magnetorheological elastomer through a controllable DC power supply, thereby controlling the natural frequency of the semi-active vibration absorber to track the excitation frequency; and using switching control to control the deformation of the piezoelectric ceramic, thereby controlling the extrusion enhancement effect of the magnetorheological elastomer, reducing the power supply requirements, and decreasing power consumption and heat generation.

[0007] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0008] In a first aspect, the present invention discloses a hybrid magnetorheological elastomer semi-active tuned mass damper, comprising a housing, a magnetic conductor assembly disposed inside the housing, and a first magnetorheological elastomer, wherein a connecting plate is disposed in the middle part of the housing.

[0009] The magnetic conductor assembly includes a stretchable magnetic conductor symmetrically arranged above and below the connecting plate. One end of the stretchable magnetic conductor is provided with a cantilever symmetrically arranged along the center of the stretchable magnetic conductor. The cantilever is located close to the connecting plate. A first magnetorheological elastomer is disposed between the cantilever and the connecting plate. Piezoelectric stacked actuators are disposed on both sides of the stretchable magnetic conductor and between the cantilever and the housing.

[0010] By placing the first magnetorheological elastomer between the cantilever and the connecting plate, a larger magnetorheological effect and a wider operating frequency band can be obtained. Through static excitation magnetic field and dynamic adjustment, the shear storage modulus of the MRE can be dynamically adjusted along the iron particle chain direction by voltage control on the piezoelectric stack, thereby realizing the dynamic adjustment of the TMD stiffness.

[0011] The compressive strengthening effect of the magnetorheological elastomer can be controlled by controlling the deformation of the piezoelectric stack actuator.

[0012] Furthermore, the magnetic conductor assembly also includes a horizontal magnetic conductor arranged symmetrically up and down along the center of the housing and a vertical magnetic conductor arranged symmetrically left and right along the center of the housing, wherein the horizontal magnetic conductor and the vertical magnetic conductor are connected by a second magnetorheological elastomer.

[0013] Specifically, the second magnetorheological elastomer is interposed at the four corners of the horizontal and vertical magnetic conductors, and the two horizontal magnetic conductors at the top and bottom and the two vertical magnetic conductors at the left and right are connected by the second magnetorheological elastomer to form a closed loop.

[0014] By setting horizontal and vertical magnetic conductors inside the shell and connecting them to form a closed loop through a second magnetorheological elastomer, the stiffness of the magnetorheological elastomer is changed by adjusting the current in the excitation coil and the shear modulus of the magnetorheological elastomer by identifying the frequency of the main structure, so that the natural frequency of the TMD is equal to the frequency of the main structure, thus achieving tuning.

[0015] The magnetorheological elastomer of the present invention, based on the portion of the magnetorheological elastomer that effectively cuts magnetic field lines during shearing, arranges second magnetorheological elastomers at the four corners of the horizontal and vertical magnetic conductors, and sets a first magnetorheological elastomer between the stretchable magnetic conductor and the connecting plate, so that the first magnetorheological elastomer arranged in the middle is in a shearing and extrusion hybrid working mode. When the main structure is subjected to force, the first magnetorheological elastomer in the middle is subjected to shearing force, extrusion, and excitation magnetic field.

[0016] Furthermore, an excitation coil is wound around the outside of the vertical magnetic conductor, and a coil sleeve is wound around the outside of the excitation coil.

[0017] Furthermore, the end of the stretchable magnetic conductor is connected to the horizontal magnetic conductor and extends into the interior of the horizontal magnetic conductor.

[0018] Furthermore, the fixed end of the piezoelectric stack driver is connected to the horizontal magnetic conductor, and the driving end of the piezoelectric stack driver is connected to the cantilever.

[0019] Furthermore, a groove is provided between the end of the horizontal magnetic conductor and the inner wall of the housing, the groove extending into the interior of the horizontal magnetic conductor, and the ratio of the inward extension distance of the groove to the external connection distance is 2:1;

[0020] A connecting rod is provided between the vertical magnetic conductor and the inner wall of the shell.

[0021] Furthermore, a spring is provided inside the groove, and the ratio of the original length to the elongation distance of the spring is 1:2.

[0022] Furthermore, a sensor is provided on the cantilever on one side of the stretchable magnetic conductor.

[0023] Specifically, the sensors are fixedly mounted on the cantilever, and include acceleration sensors and displacement sensors to acquire the acceleration and displacement of the TMD dynamic mass and the main structure.

[0024] Furthermore, it also includes a control system module, to which the excitation coil and the piezoelectric stack driver are respectively connected. Specifically, the control system module is connected to a computer device; the sensor, piezoelectric stack driver, excitation coil, and control system module together form a closed-loop control system. The sensor acquires the acceleration and displacement information of the main structure, analyzes it through STFT to obtain the frequency of the external excitation, and transmits it to the control system module to dynamically adjust the stiffness of the TMD.

[0025] Secondly, this invention discloses a semi-actively tuned mass damping principle of magnetorheological elastomer, which applies the above-mentioned hybrid magnetorheological elastomer semi-actively tuned mass damper for vibration reduction.

[0026] Specifically, the semi-actively tuned mass damping method for magnetorheological elastomers of the present invention includes:

[0027] Acquire the acceleration signals of the main structure and the TMD dynamic mass, identify the frequency of the main structure through short-time Fourier transform, and establish the relationship between stiffness and current;

[0028] Based on the relationship between stiffness and current, the required stiffness of the TMD is calculated, and the normalized time-domain average acceleration S of the TMD's dynamic mass relative to the main system and the main structure is obtained. i ;

[0029] In the tuning control, the current required by the TMD excitation coil is output to change the strength around the magnetorheological elastomer, thereby changing the stiffness of the magnetorheological elastomer so that its frequency matches the frequency of the controlled structure.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] First, the hybrid magnetorheological elastomer semi-actively tuned mass damper of the present invention dynamically adjusts the shear storage modulus of the MRE by using a static excitation magnetic field and dynamic compressive strain along the iron particle chain direction, thereby achieving dynamic adjustment of the TMD stiffness; it can better adapt to the frequency changes of the main structure, broaden the operating frequency band of the TDM, and thus achieve a better vibration control effect; by using a static excitation magnetic field and dynamically adjusting the voltage acting on the piezoelectric stack, the compressive strain along the iron particle chain direction is controlled, and the shear storage modulus of the MRE is dynamically adjusted, reducing the power supply requirements and reducing power consumption and power generation;

[0032] Secondly, the semi-active tuned mass damping principle of the magnetorheological elastomer of the present invention is based on the magnetorheological effect and the compression enhancement effect to change the stiffness of the magnetorheological elastomer, realize frequency conversion control, broaden the working frequency band of the TMD and enhance the vibration reduction effect of the TMD. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 This is a schematic diagram of a hybrid magnetorheological elastomer semi-actively tuned mass damper provided in an embodiment of the present invention.

[0035] Figure 2 A schematic diagram of the operation of the first magnetorheological elastomer in the middle part of the tuned mass damping device provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the shearing and extrusion working mode of the first magnetorheological elastomer in the middle part provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the chute structure provided in an embodiment of the present invention;

[0038] Figure 5This is a schematic diagram of the installation of a semi-active tuned mass damper and frame structure provided in an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the control system provided in an embodiment of the present invention;

[0040] in

[0041] 1-Housing; 2-Magnetic conductor assembly;

[0042] 201 - Horizontal magnetic conductor; 202 - Vertical magnetic conductor;

[0043] 203 - Stretchable magnetic conductor; 2031 - Cantilever;

[0044] 3-First magnetorheological elastomer; 4-Second magnetorheological elastomer;

[0045] 5-Excitation coil; 6-Coil sleeve;

[0046] 7-Connecting plate; 8-Piezoelectric stack driver;

[0047] 801 - Fixed end; 802 - Drive end;

[0048] 9-Groove; 10-Spring;

[0049] 11-Connecting rod; 12-Main structure;

[0050] 13-Sensor. Detailed Implementation

[0051] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. 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.

[0052] To more clearly illustrate the technical solutions in this invention, specific embodiments are described below.

[0053] See Figure 1-6 As shown, the present invention discloses a hybrid magnetorheological elastomer semi-active tuned mass damper and its principle. The hybrid magnetorheological elastomer semi-active tuned mass damper includes a housing 1, a magnetic conductor assembly 2 disposed inside the housing 1, a first magnetorheological elastomer 3, a second magnetorheological elastomer 4, an excitation coil 5, and a coil sleeve 6.

[0054] Specifically, the magnetic conductor assembly 2 includes horizontal magnetic conductors 201 arranged symmetrically up and down along the center of the housing 1 and vertical magnetic conductors 202 arranged symmetrically left and right along the center of the housing 1. The horizontal magnetic conductors 201 and vertical magnetic conductors 202 are connected by a second magnetorheological elastomer 4. Specifically, the second magnetorheological elastomer 4 is intersected at the four corners of the horizontal magnetic conductors 201 and the vertical magnetic conductors 202. The two horizontal magnetic conductors 201 and the two vertical magnetic conductors 202 are connected by the second magnetorheological elastomer 4 to form a closed loop.

[0055] Preferably, an excitation coil 5 is wound around the outside of the vertical magnetic conductor 202, and a coil sleeve 6 is wound around the outside of the excitation coil 5.

[0056] By placing a horizontal magnetic conductor 201 and a vertical magnetic conductor 202 inside the housing 1, and connecting the horizontal magnetic conductor 201 and the vertical magnetic conductor 202 to form a closed loop via a second magnetorheological elastomer 4, the current passing through the excitation coil 5 and the shear modulus of the second magnetorheological elastomer 4 are adjusted by recognizing the frequency of the main structure 12, thereby changing the stiffness of the second magnetorheological elastomer 4, so that the natural frequency of the TMD is equal to the frequency of the main structure 12, thus achieving tuning. During operation, the compressive strain of the second magnetorheological elastomer 4 is ensured to be greater than 1%, thereby providing 104 N / m. 2 The pressure.

[0057] See Figure 1-3 As shown, a connecting plate 7 is provided in the middle part of the housing 1; the magnetic conductor assembly 2 also includes a stretchable magnetic conductor 203 symmetrically arranged vertically along the connecting plate 7. One end of the stretchable magnetic conductor 203 is provided with a cantilever 2031 symmetrically arranged along the center of the stretchable magnetic conductor 203. The cantilever 2031 is arranged close to the connecting plate 7. A first magnetorheological elastomer 3 is arranged between the cantilever 2031 and the connecting plate 7. Piezoelectric stacked actuators 8 are arranged on both sides of the stretchable magnetic conductor 203 and between the cantilever 2031 and the housing 1.

[0058] By setting a first magnetorheological elastomer 3, the stiffness of the first magnetorheological elastomer 3 can be changed based on the magnetorheological effect and the compression enhancement effect, thereby realizing frequency conversion control, widening the operating frequency band of the semi-active tuned mass damping device, and enhancing the vibration reduction effect of the TMD.

[0059] Preferably, the end of the stretchable conductor is connected to the horizontal magnetic conductor 201 and extends into the interior of the horizontal magnetic conductor 201.

[0060] Preferably, the fixed end 801 of the piezoelectric stacking driver is connected to the horizontal magnetic conductor 201, and the driving end 802 of the piezoelectric stacking driver is connected to the cantilever 2031.

[0061] See Figure 4 and combined Figure 1As shown, a groove 9 is provided between the end of the horizontal magnetic conductor 201 and the inner wall of the housing 1. The groove 9 extends into the interior of the horizontal magnetic conductor 201, and the ratio of the inward extension distance of the groove 9 to the external connection distance is 2:1. A spring 10 is provided inside the groove 9, and the ratio of the original length to the extension distance of the spring 10 is 1:2. When the controlled structure is subjected to shear force, the spring 10 on the groove 9 is guaranteed to have sufficient extension and contraction distance, and the groove 9 can provide support for the output force of the piezoelectric stacked actuator 8.

[0062] Preferably, a connecting rod 11 is provided between the vertical magnetic conductor 202 and the inner wall of the housing 1.

[0063] See Figure 5 As shown, a fixing plate is provided at the bottom of the housing 1 for connection with the main structure 12. The position of the fixing plate can be selected according to the actual situation. Several connection holes of the same spacing and size are provided around the fixing plate, and the positions of the connection holes are adapted to the positions of the fixing holes of the frame mechanism. The connection holes and the fixing holes are connected by bolts.

[0064] The hybrid magnetorheological elastomer semi-active tuned mass damper of this embodiment is used to solve the problem of reduced vibration reduction effect of traditional TMD when the frequency of the main structure 12 changes. The outer shell of the shell 1 can be designed as a rectangle, square, or parallelogram, and can be designed as needed according to the actual needs of the mechanism.

[0065] In this embodiment, sensor 13 is fixed on the cantilever 2031 on one side of the stretchable conductor, that is, fixed on the dynamic mass and the main structure 12. It includes an acceleration sensor and a displacement sensor for acquiring structural vibration information. Sensor 13 is used to acquire the acceleration and displacement of the dynamic mass of the semi-active tuned mass damping device and the main structure 12.

[0066] Preferred options, please refer to Figure 6 As shown, the hybrid magnetorheological elastomer semi-active tuned mass damper of the present invention also includes a control system module, and the excitation coil 5, the piezoelectric stack driver 8 and the sensor 13 are respectively connected to the control system module.

[0067] Specifically, the control system module includes a DC power supply control system, an AC voltage control system, and a combined controller. The combined controller includes tuning control and switching control. The tuning control is used to control the DC power supply control system, and the switching control is used to control the voltage of the piezoelectric stack driver 8.

[0068] Specifically, the control law is as follows:

[0069] ΔK as =g i S i ;

[0070] ΔKad =g v S v S c ;

[0071]

[0072]

[0073]

[0074] Among them, S i Normalized time-domain average of the dynamic mass of the vibration absorber relative to the main structure acceleration, S v For the output of the switch controller, ΔK as This refers to the increase in the stiffness of a smart spring based on the magnetorheological effect, generated by excitation through a controllable DC power supply. ΔK ad This refers to the intelligent spring stiffness increment based on the magnetorheological compression enhancement effect, which is controlled by a controllable voltage source. i For ΔK as The feedback coefficient, g v For ΔK ad The feedback coefficient, S c B is the output of the joint controller, and B is the magnetic field strength.

[0075] The aforementioned control system and control law employ a joint control strategy for stiffness control. The joint control strategy's control process for the semi-active tuned mass damping device includes the following steps:

[0076] First, the acceleration signals of the main structure and the TMD dynamic mass are acquired. The frequency of the main structure is identified through Short Time Fourier Transform (STFT), establishing the relationship between stiffness and current. The required stiffness of the TMD is then calculated, yielding the normalized time-domain average Sacceleration of the TMD dynamic mass relative to the main system and the main structure. i This allows the output of the current required by the TMD excitation coil in the tuning control to change the strength around the magnetorheological elastomer, thereby changing the stiffness of the magnetorheological elastomer so that its frequency matches the frequency of the controlled structure, thus achieving the effect of a semi-active TMD and having a good vibration reduction effect.

[0077] Secondly, the displacement of the TMD dynamic mass and the main structure detected by the displacement sensor is used to perform a displacement calculation process on the displacement of the dynamic mass relative to the main system and the displacement of the main structure. This process is then used to control the output of the switch controller, control the deformation of the piezoelectric ceramic, and thus control the extrusion enhancement effect of the magnetorheological elastomer. Under the premise that the natural frequency of the TMD can track the external excitation frequency, the damping of the TMD should be appropriately reduced to improve its vibration reduction effect.

[0078] Third, the output of the joint controller depends on the square of the normalized time-domain average Si of the acceleration Ya” of the TMD dynamic mass relative to the main system and the acceleration Xp” of the main structure, and the magnitude of the magnetic field strength B. If Si2 < B, the piezoelectric stack driver works; if Si2 > B, the piezoelectric stack driver does not work. The output Sc of the joint controller determines whether to dynamically control the piezoelectric stack to adjust the stiffness of the TMD.

[0079] The hybrid magnetorheological elastomer semi-actively tuned mass damper of the present invention uses short-time Fourier transform to analyze the signal, specifically including the following calculation steps:

[0080] S1. First, it is necessary to determine the relevant parameters, including the original signal, window function, scale parameter, number of overlap points, and sampling frequency; among them, the number of Fourier points is mainly used in the calculation process of Fourier transform;

[0081] S2. Convert the original signal into one-dimensional data. Determine the length of the original signal, calculate the number of window slides based on the signal length, window function length, and number of overlap points, and divide the original limit sign into multiple columns of data;

[0082] S3. Calculate the value of each column data using a sliding window function; here, the window function and the original limit sign are multiplied by a dot product, and the result of the dot product is subjected to a fast Fourier transform to obtain the time-frequency matrix.

[0083] S4. Generate a spectrum diagram as the output based on the time-frequency matrix. By processing the time-frequency matrix, the frequency information of the signal is displayed in a visual manner.

[0084] In summary, the hybrid magnetorheological elastomer semi-active tuned mass damper of the present invention utilizes sensors to acquire vibration information of the structure and external load information, and applies signals through the control system module to change the current through the static excitation coil and control the voltage of the piezoelectric stack driver, thereby dynamically adjusting the shear storage modulus of the MRE and realizing the frequency modulation control of the semi-active TMD, thus more effectively achieving the vibration reduction effect on the main structure.

[0085] Finally, it should be noted that although this specification contains many specific implementation details, these should not be construed as limiting the scope of any invention or the scope of the claims, but rather are primarily used to describe the features of specific embodiments of a particular invention. Certain features described in the various embodiments of this specification may also be implemented in combination in a single embodiment. On the other hand, various features described in a single embodiment may also be implemented separately in various embodiments or in any suitable sub-combination. Furthermore, while features may function in certain combinations as described above and even initially claimed in this way, one or more features from a claimed combination may be removed from that combination in some cases, and a claimed combination may refer to a sub-combination or a variation of a sub-combination.

[0086] Similarly, although the operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or requiring all illustrated operations to be performed to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of various system modules and components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0087] Thus, specific embodiments of the subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims may be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings are not necessarily shown in a specific order or sequence to achieve the desired result. In some implementations, multitasking and parallel processing may be advantageous.

[0088] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A hybrid magneto-rheological elastomer semi-active tuned mass damper, characterized in that, The application relates to a mixed-mode magneto-rheological elastomer semi-active tuned mass damper, which comprises a shell, a magnetic conductor assembly arranged in the shell and a first magneto-rheological elastomer. The magnetic conductor assembly comprises telescopic magnetic conductors arranged symmetrically above and below the connecting plate, one end of the telescopic magnetic conductors is provided with cantilevers arranged symmetrically along the center of the telescopic magnetic conductors, the cantilevers are arranged close to the connecting plate, the first magneto-rheological elastomer is arranged between the cantilevers and the connecting plate, piezoelectric stack drivers are arranged on both sides of the telescopic magnetic conductors and between the cantilevers and the shell. The magnetic conductor assembly further comprises horizontal magnetic conductors arranged symmetrically above and below the center of the shell and vertical magnetic conductors arranged symmetrically left and right along the center of the shell, the horizontal magnetic conductors and the vertical magnetic conductors are connected through a second magneto-rheological elastomer. The end of the telescopic magnetic conductor is connected with the horizontal magnetic conductor and extends into the horizontal magnetic conductor. The fixed end of the piezoelectric stack driver is connected with the horizontal magnetic conductor, and the driving end of the piezoelectric stack driver is connected with the cantilever. The second magneto-rheological elastomer is arranged at the four corners of the horizontal magnetic conductors and the vertical magnetic conductors, and the two horizontal magnetic conductors and the two vertical magnetic conductors are connected through the second magneto-rheological elastomer to form a closed loop.

2. The hybrid magneto-rheological elastomer semi-active tuned mass damper according to claim 1, characterized in that, An excitation coil is arranged outside the vertical magnetic conductor, and a coil sleeve is arranged outside the excitation coil.

3. The hybrid magneto-rheological elastomer semi-active tuned mass damper according to claim 1, characterized in that, A sliding groove is arranged between the end of the horizontal magnetic conductor and the inner wall of the shell, the sliding groove extends into the horizontal magnetic conductor, and the inner extension distance of the sliding groove is 2:1 of the outer connection distance. A connecting rod is arranged between the vertical magnetic conductor and the inner wall of the shell.

4. The hybrid magneto-rheological elastomer semi-active tuned mass damper according to claim 3, characterized in that, A spring is arranged in the sliding groove, and the original length of the spring is 1:2 of the extension distance.

5. The hybrid magneto-rheological elastomer semi-active tuned mass damper according to claim 2, wherein, A sensor is arranged on the cantilever on one side of the telescopic magnetic conductor.

6. The hybrid magneto-rheological elastomer semi-active tuned mass damper according to claim 5, characterized in that, A control system module is further arranged, and the excitation coil and the piezoelectric stack driver are connected with the control system module.

7. A hybrid magneto-rheological elastomer semi-active tuned mass damper principle, characterized in that, The mixed-mode magneto-rheological elastomer semi-active tuned mass damper is applied to vibration reduction.

Images