Active and passive combined type universal vibration isolation base and vibration suppression method

Abstract

The invention provides an active and passive combined type universal vibration isolation base and a vibration suppression method.The vibration isolation base comprises a base shell, a friction wall face, a transverse buffering mechanism, a high-strength elastomer and an axial buffering mechanism, the bottom of the base shell is connected with a vibration source, the friction wall face is installed on the inner wall of the base shell, and the transverse buffering mechanism abuts against the inner wall of the friction wall face; the vibration isolation object is connected to the top of the transverse buffering mechanism, the upper portion of the high-strength elastomer is elastically connected with the bottom of the transverse buffering mechanism, the lower portion of the high-strength elastomer is elastically connected with the top of the axial buffering mechanism, and the bottom of the axial buffering mechanism is connected to the bottom of the base shell. The transverse buffering mechanism and the axial buffering mechanism form a passive damping mechanism, and a magneto-rheological body adjusting structure arranged on the transverse buffering mechanism and a friction damping adjusting structure arranged on the friction wall face form an active adjusting mechanism. Through a passive damping mechanism and an active adjusting mechanism, efficient isolation of full-band vibration and multi-direction vibration can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration control, and in particular, to a main-passive composite universal vibration isolation base and a vibration suppression method. Background Art

[0002] With the deep promotion of industrialization and intelligentization, high-end mechanical equipment is evolving towards heavy-load high-speed and precision nanometerization. Its stability and reliability face severe challenges in complex vibration environments. Structural resonance faults induced by rotating mechanical equipment occur frequently, and precision machining instruments are affected by vibration interference, resulting in a decline in accuracy. Especially in scenarios such as ship power units and aero-engines, vibration isolation has become an urgent need both for the external environment and for the equipment itself.

[0003] In traditional vibration isolation technology, passive vibration isolation is the most common, and generally absorbs or reflects vibration energy through the inherent characteristics of materials or structures. Patent CN108313252B proposes a vibration damping base based on metal rubber. There are webs and gusset plates longitudinally arranged between the base plate and the connecting plate and under the connecting plate, and damping plates and constraint plates are also provided on the side walls of each structure. Vibration is attenuated through the impedance mismatch principle. However, the attenuation efficiency for low-frequency vibration is insufficient and the overall weight is relatively large. Patent CN115303413B proposes a chain panel vibration damping base based on the impedance mismatch principle. The rectangular base panel is divided into chain sub-panels, and at the same time, an anti-side force spring damper is connected at the bottom. The sudden change of the chain panel structure can attenuate high-frequency vibration, but low-frequency vibration damping still relies on springs, which is prone to resonance and leads to a decline in vibration isolation performance. Patent CN115492894B proposes a chain panel liquid capsule-supported high-efficiency vibration damping base. A rectangular liquid capsule is arranged at the bottom of the chain panel, and at the same time, a vertical limiting device is used to constrain the vibration direction. Double vibration damping can be achieved through the impedance mismatch panel and the viscous resistance liquid capsule. However, the stiffness mismatch between the panel and the liquid capsule is likely to cause the transmission ratio to rise instead in the middle frequency band. Patent CN117307657A discloses a composite vibration damping base based on surface wave characteristics. The liquid storage tank is filled with damping liquid, and the internal flow dividing box and the upper base plate are fixed by a spring limiting mechanism. When the equipment vibrates, the spring is compressed to disturb the liquid, and the liquid then dissipates energy through the flow dividing structure. However, low-frequency vibration cannot excite effective surface waves. Patent CN118669486A discloses a sandwich superstructure vibration isolation platform. An orthogonal elastic ring array is arranged between the upper and lower platforms, and at the same time, a support mechanism is arranged circumferentially to constrain the lateral displacement. The vibration in a specific frequency band is suppressed by using the bandgap characteristic. However, the low-frequency bandgap is missing, and the orthogonal design of the rings leads to a short fatigue life due to stress concentration at the overlapping parts. Patent CN118066239A discloses a vibration damping base. The base panel is provided with an acoustic black hole structure in the first plane, and at the same time, a vibration damping oscillator is installed in the second plane. The acoustic black hole aggregates high-frequency vibration energy through the gradual change of thickness, and the vibration damping oscillator absorbs low-frequency vibration waves through mass tuning. However, the actual effective bandwidth of the two is limited. It can be seen that although passive vibration isolation technology has a low cost and can effectively respond to high-frequency vibration, it still cannot achieve the attenuation of vibration waves in the full frequency band, and its adaptability in complex working condition environments is weak. The damping cannot be adjusted in real time, resulting in over-damping or under-damping situations.

[0004] In order to broaden the vibration response frequency and improve the adaptability to complex working conditions, active vibration reduction technology has emerged. Generally, sensing technology is used to monitor vibration signals in real time, and then through the calculation of the control system, the actuator is driven to apply a reverse force to cancel the vibration. Patent CN222296830U proposes a magnetically suspended tray active vibration reduction device. Magnets are fixed on the upper and lower sides of the four corners of the tray. At the same time, electromagnetic coils are arranged at the positions facing the magnets by using magnetic brackets to form reverse magnetic poles. The vibration signal is detected in real time by the central sensing system, and then the magnetic force of the electromagnetic coils is adjusted to achieve active vibration reduction. However, it requires continuous external power supply, resulting in huge power consumption, and the electromagnetic coils are easily interfered by external magnetic fields, leading to system failure; Patent CN112879482A proposes an active vibration reduction platform. The base is filled with magnetorheological fluid and through holes are opened at the top. Then, the piston connecting rod passes through the through holes to connect the internal piston plate and the upper support plate. At the same time, the piston connecting rod is also wound with an electromagnetic coil. By adjusting the magnetic field strength through the control module, the viscosity of the liquid can be changed, thereby changing the damping performance. However, strict sealing is required between the piston and the base, and the algorithm of the control module is relatively complex; Patent CN101382178A proposes an active vibration reduction and isolation device. A sealed piston is arranged in the air chamber. Then, an inverted pendulum is used to connect the piston and the load-bearing component, and a vertical linear actuator and a horizontal linear actuator are arranged between the load-bearing component and the air chamber housing. The air-floating structure provides bidirectional stiffness and eliminates motion constraints at the same time. However, the device structure is complex, and the accuracy matching of the control system is not perfect enough, resulting in the influence on the active vibration reduction performance; Patent CN116123248A proposes an active vibration reduction and noise reduction base. Positioning brackets are symmetrically arranged on both sides of the top of the base. A limit bracket is arranged outside the positioning bracket. An electromagnetic brake is arranged outside the limit bracket, and a pressure sensing device is arranged between the two. The edge control system receives vibration, swing, and pressure signals and then dynamically adjusts the clamping force applied by the brake. However, the system requires multiple sensing devices to work together, resulting in signal delay and lag in response; Patent CN105351437A proposes an intelligent vibration isolation system that automatically adjusts stiffness and damping. Two acceleration sensors are respectively located inside the housing and on the mounting core mating disk. After the vibration signal is processed by the calculation system, the signal is transmitted to the servo motor to drive the ball screw to adjust the positions of the damping plate and the adjusting plate, thereby adjusting the pressure between the damping plate and the damping wall and the density of the wire mesh inside the vibration isolation system. However, the adjustment of the wire mesh density is uneven, which is likely to cause local stress and fatigue fracture. It can be seen that although the active vibration isolation technology can adjust the damping in real time and thus has the ability of broadband vibration response, the system is relatively complex and highly dependent on external energy supply.

[0005] Since both pure passive and pure active vibration isolation technologies have certain limitations and are difficult to meet the vibration isolation requirements in real life, the main passive composite vibration isolation technology has great development potential, can achieve complementary advantages, and better adapt to complex environments. Patent CN118309752A proposes a variable impedance composite vibration isolation device. The spring is embedded above the guide rail and the load path is connected in series to transmit the supporting elasticity. The voice coil motor is connected in parallel on both sides of the guide rail and cooperates with a high-precision grating ruler to locally apply force to adjust the impedance. The mechanical limit device is embedded in the guide rail to prevent overtravel damage. However, the rigid connection between the spring and the guide rail may cause high-frequency resonance; Patent CN217003698U proposes a main passive vibration isolation base based on Lorentz force drive. The top plate selects a layered composite structure, and drivers are respectively connected to the four corners of the bottom layer. The drive mechanism is composed of a Lorentz force motor and a metal spring connected in parallel. At the same time, a controller and a sensor are integrated inside the base. The active control motor outputs a reverse force to compensate for low-frequency vibration, but it is difficult to cope with lateral disturbances; Patent CN217003693U proposes a main passive vibration isolation base based on rubber damping. The top plate selects a three-layer rubber design to absorb vibration through gradient damping. The legs are welded to the four corners of the bottom of the top plate and are connected oppositely by crossbeams. A support block is designed at the intersection of the crossbeams, and an air spring is installed above it and the position of the spring is controlled by the controller to ensure the stability of the system. However, the load-bearing capacity of the device is limited and it is difficult to cope with complex vibrations; Patent CN215720467U proposes a main passive combined vibration damping base. Piezoelectric ceramics are installed at the bottom of the support block, voice coil motors and springs are arranged on the left and right and front and rear sides, and the top is connected to the support top plate through rubber. The control system generates a compensation force based on the information fed back by the sensors above the support block. However, the stroke of the piezoelectric ceramics is limited and it is difficult to cope with large impacts; The paper "Research on a New Type of Main Passive Vibration Isolator Based on Multi-Degree-of-Freedom Control" proposes a new type of main passive vibration isolator, which presents a sandwich configuration as a whole. Shear-type rubber vibration isolators are arranged at the upper and lower ends, and a mass block is arranged between them. Sensors are arranged above the mass block to measure multi-directional vibrations. Eight actuators are embedded inside the mass block to generate axial and lateral forces. The stator of the actuator is connected to the mass block by a central stud, and the mover of the actuator is connected to the central stud by a spring and can reciprocate under the action of electromagnetic force. However, the vibration isolator in the paper involves multi-degree-of-freedom control and the integration of multiple actuators, resulting in a complex control system;The paper "Research on a New Type of Rubber-Electromagnetic Composite Main-Passive Vibration Isolator" proposes a composite main-passive vibration isolator combining a low-frequency rubber vibration isolator and a linear electromagnetic actuator. A shear-type rubber vibration isolator is designed externally, and nitrile rubber is selected to form a double-layer series structure. An inertial body is arranged in the middle of the rubber layer, and the electromagnetic actuator is placed in the internal cavity of the rubber vibration isolator. The magnetic conductor shell of the electromagnetic actuator is connected to the inertial body of the passive vibration isolator. The magnetic conductor and the permanent magnet can be regarded as the stator of the actuator, and the coil and the bracket can be regarded as the rotor of the actuator. The coil bracket is connected to the upper end face of the vibration isolator so that the coil is suspended in the working position. The electromagnetic force acts between the load and the inertial body to achieve active control. However, the vibration reduction effect of the vibration isolator in the paper combined with relevant algorithms is not as expected under high-frequency vibration, and there is a slow convergence of vibration control in some frequency bands. The paper "Research on Magnetic Levitation-Airbag Main-Passive Vibration Isolation Technology and Performance Testing" proposes a magnetic levitation-airbag main-passive hybrid vibration isolation device. The upper and lower covers and the bladder body form an airbag vibration isolator. There are air holes and wire holes on the airbag cover. A military airtight socket is installed at the outlet of the wire hole. A magnetic levitation actuator is arranged inside the airbag vibration isolator, and two temperature sensors are installed inside the magnetic levitation actuator. The structure is compact, but it is mainly used to deal with vertical vibration, making it difficult to adapt to complex vibration modes.

[0006] Although there are already main-passive composite vibration isolation designs, there are still problems such as complex vibration isolation systems, difficulty in meeting actual requirements for vibration isolation frequency bands or vibration isolation directions. Therefore, it is necessary to develop a main-passive composite vibration isolation base with multi-party broadband vibration reduction ability, adjustable damping, and simple structure to solve the deficiencies of the existing technology. Summary of the Invention

[0007] According to the above-mentioned technical problems, a main-passive composite universal vibration isolation base and a vibration suppression method are provided.

[0008] The technical means adopted in the present invention are as follows:

[0009] A main-passive composite universal vibration isolation base, comprising: a base shell, a friction wall surface, a lateral buffer mechanism, a high-strength elastic body, and an axial buffer mechanism. The bottom of the base shell is connected to the vibration source, the friction wall surface is installed on the inner wall of the base shell, the lateral buffer mechanism abuts against the inner wall of the friction wall surface, the vibration isolation object is connected to the top of the lateral buffer mechanism, the upper part of the high-strength elastic body is elastically connected to the bottom of the lateral buffer mechanism, the lower part of the high-strength elastic body is elastically connected to the top of the axial buffer mechanism, and the bottom of the axial buffer mechanism is connected to the bottom inside the base shell;

[0010] The lateral buffer mechanism and the axial buffer mechanism constitute a passive damping mechanism. The lateral buffer mechanism is provided with a magnetorheological fluid adjustment structure, and the friction wall surface is provided with a friction damping adjustment structure. The magnetorheological fluid adjustment structure and the friction damping adjustment structure constitute an active adjustment mechanism.

[0011] Further, the lateral buffer mechanism includes a support platform, a magnetorheological fluid, a buffer ring wall, a plurality of sleeves, a plurality of pistons and a plurality of first springs. The axial upper and lower column sections of the support platform have a radius greater than that of the middle column section, presenting a dumbbell shape. An annular groove is formed between the outer side of the middle column section and the upper and lower column sections. The magnetorheological fluid is sleeved on the middle column section and placed in the annular groove. The inner side of the magnetorheological fluid fits against the middle column section of the support platform. The buffer ring wall is placed in the annular groove and generates interference pressure through interference fit with the inner wall of the friction wall surface. A plurality of through holes are spaced circumferentially along the inner side of the buffer ring wall. The plurality of sleeves are circumferentially distributed and are respectively fixed in the plurality of through holes;

[0012] The plurality of pistons are respectively connected in cooperation with the plurality of sleeves. The piston includes a head, a piston rod and a shank. The two ends of the piston rod are respectively connected to the head and the shank. The head is placed inside the sleeve. The piston rod penetrates through one end of the sleeve away from the friction wall surface. The shank is located outside the sleeve and abuts against the magnetorheological fluid. The first spring is sleeved on the piston rod and abuts between the sleeve and the shank;

[0013] A first circular groove is opened at the center of the bottom of the support platform. The top of the high-strength elastic body is connected to the first circular groove.

[0014] Further, an annular cavity is provided inside the buffer ring wall. The cavity is filled with gas or liquid. The interiors of the plurality of sleeves are communicated through the cavity. Each sleeve and the corresponding piston form a pressure interconnection system through the cavity. Sealing rubber / sealing rings are respectively provided between the inner wall of the through hole and the outer wall of the sleeve and between the inner wall of the sleeve and the outer wall of the head of the piston, forming a sealed gas chamber or a sealed liquid chamber.

[0015] Further, the axial buffer mechanism includes a mounting connecting plate, a plurality of connecting rods, a plurality of sliders, a slide rail, a plurality of second springs, a plurality of limit columns and a damping device. A circular groove is opened at the center of the bottom of the mounting connecting plate. The top of the damping device is fixedly connected in the circular groove. The bottom of the damping device is connected to the center of the slide rail. The bottom of the slide rail is embedded and fixed in a card slot at the bottom of the base housing. A plurality of pin holes are symmetrically opened at the bottom of the mounting connecting plate. One ends of the plurality of connecting rods are respectively hinged to the plurality of pin holes. The other ends of the plurality of connecting rods are respectively hinged to the tops of the plurality of sliders. The plurality of connecting rods are circumferentially distributed around the damping device;

[0016] The plurality of sliders are circumferentially distributed and are all slidably connected above the slide rail. A plurality of limit columns are provided along the circumference at the outer end of the slide rail. A guide rod is provided at the front end of the slider. The plurality of guide rods are respectively penetrated and connected to the plurality of limit columns. The second spring is sleeved on the guide rod and abuts between the slider and the limit column;

[0017] A second circular groove is formed at the center of the top of the mounting connecting plate, and the bottom of the high-strength elastic body is connected to the second circular groove.

[0018] Further, a first piezoelectric film is adhesively bonded to the outer circumferential surface of the magnetorheological fluid near the handle portion through a high-strength adhesive. The first piezoelectric film is disposed between the magnetorheological fluid and the handle portion. The center position of the first piezoelectric film faces the piston and is distributed in an array to sense lateral vibration signals. The first piezoelectric film is connected to a control system.

[0019] Further, grooves are formed on the outer side surfaces of the upper and lower column sections of the support platform. Coil windings are adhesively bonded in the grooves. The coil windings are connected to the control system to form a closed loop, generating a magnetic field to adjust the damping and stiffness of the magnetorheological fluid. The mutual cooperation of the first piezoelectric film, the control system, the coil windings, and the magnetorheological fluid constitutes a magnetorheological fluid adjustment structure.

[0020] Further, second piezoelectric films are adhesively bonded to the upper and lower surfaces of the buffer ring wall through a high-strength adhesive. The second piezoelectric films are disposed between the buffer ring wall and the support platform. The second piezoelectric films are connected to the control system.

[0021] Further, the friction wall surface is selected as an electrorheological elastomer. Insulating materials and metal thin plates are sequentially connected to the upper and lower sides of the friction wall surface from the inside to the outside. The metal thin plates are connected to the control system. The mutual cooperation of the second piezoelectric film, the control system, the insulating material, the metal thin plate, the friction wall surface, and the buffer ring wall constitutes a friction damping adjustment structure.

[0022] The present invention also provides a vibration suppression method for a main-passive composite universal vibration isolation base, including the following steps:

[0023] Step 1: The bottom of the base housing is connected to the vibration source through bolts, and the top of the support platform of the lateral buffer mechanism is connected to the vibration isolation object through bolts.

[0024] Step 2: The vibration source starts to vibrate, and the vibration signal is transmitted upward or inward through the base structure to the piezoelectric film of the lateral buffer mechanism. The piezoelectric film senses the vibration signal in real time and transmits the signal to the control system.

[0025] Step 3: The control system analyzes the vibration signal in real time. First, it determines whether there is an instantaneous large-amplitude vibration. If so, the system will immediately start the coordinated operation of active and passive vibration isolation technologies. Passive level: The slider of the axial buffer mechanism approaches the limit column along the slide rail to buffer the vibration, and the second spring reaches the compression limit. Active level: The control system instantaneously increases the stiffness and damping of the magnetorheological fluid to prevent damage to the main structure.

[0026] Step 4: If there is no instantaneous large vibration, the control system will further judge the vibration frequency. When the vibration frequency is lower than the set threshold, the control system activates the active adjustment mechanism; when the vibration frequency is higher than the set threshold, the control system selects the passive damping mechanism;

[0027] Step 5: The piezoelectric film and the control system cooperate with each other to monitor the vibration signal in real time, and repeat the above control process to form a closed-loop control, so that the vibration transmission is effectively suppressed and the stability of the system is guaranteed.

[0028] Further, in the said Step 4, the passive damping mechanism includes:

[0029] The lateral vibration is transmitted to the buffer ring wall through the base shell and the friction wall surface, disturbing the air or liquid in the cavity to initially absorb the vibration energy. At this time, a relative displacement occurs between the piston and the buffer ring wall to abut against the magnetorheological fluid, and the additional damping is provided by means of the viscous characteristics of the magnetorheological fluid to further absorb the vibration wave;

[0030] The axial vibration is transmitted upward through the base shell and the slide rail in the card slot. The second spring converts the vibration energy into elastic potential energy for storage, and combines with the vibration damping device to dissipate the vibration energy. At the same time, the axial vibration energy is further dissipated by the friction damping generated by the friction wall surface and the buffer ring wall;

[0031] The active adjustment mechanism includes:

[0032] Magnetorheological fluid adjustment: The coil winding is connected to the control system to form a closed loop. The control system adjusts the output current according to the vibration signal to adjust the magnetic field strength, so that the viscosity of the magnetorheological fluid changes dynamically with the vibration frequency to achieve active suppression of low-frequency vibration;

[0033] Friction wall surface adjustment: The friction wall surface selects the electrorheological elastomer. The metal thin plates on both sides are connected to the control system to form a parallel plate capacitor. The control system adjusts the electric field strength between the metal thin plates according to the vibration signal, thereby changing the surface friction coefficient of the friction wall surface and optimizing the friction damping.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The main and passive composite universal vibration isolation base and vibration suppression method provided by the present invention can achieve efficient isolation of full-frequency vibration and multi-directional vibration through the passive damping mechanism and the active adjustment mechanism. The passive damping mechanism absorbs the vibration energy in the medium and high frequency bands through the friction damping generated between the two wall surfaces, the viscous damping inside the buffer ring wall, the viscous characteristics of the magnetorheological fluid, and the elastic damping of the elastic structure; the active adjustment mechanism dynamically adjusts the magnetic field and electric field strength by means of the piezoelectric film to monitor the vibration signal in real time, and changes the damping stiffness of the magnetorheological fluid and the friction coefficient of the friction wall surface to achieve precise suppression of low-frequency resonance.

[0036] 2. The active and passive composite universal vibration isolation base and vibration suppression method provided by the present invention can automatically coordinate the active and passive modes according to the vibration spectrum in a complex environment, avoid the problems of over-damping or under-damping, and can trigger a protection mechanism when encountering impact loads to ensure the structural safety, so that the state of the vibration isolation object always meets the vibration isolation requirements. It is applicable to, but not limited to, complex application scenarios such as ship power units and aero-engines, can effectively improve the stability and reliability of equipment, and has broad and long-term industrial application value.

[0037] Based on the above reasons, the present invention can be widely promoted in the fields of ships, aviation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 Schematic diagram of the external shape of an active and passive composite universal vibration isolation base according to a specific embodiment of the present invention.

[0040] Figure 2 Schematic sectional view of an active and passive composite universal vibration isolation base according to a specific embodiment of the present invention.

[0041] Figure 3 Partial schematic diagram of the lateral buffer mechanism according to a specific embodiment of the present invention.

[0042] Figure 4 Partial sectional view of the lateral buffer mechanism according to a specific embodiment of the present invention.

[0043] Figure 5 Schematic sectional view of the buffer ring wall according to a specific embodiment of the present invention.

[0044] Figure 6 Schematic sectional view of the lateral buffer mechanism according to a specific embodiment of the present invention.

[0045] Figure 7 Schematic diagram of the axial buffer mechanism structure according to a specific embodiment of the present invention.

[0046] Figure 8 Flowchart of the vibration suppression method according to a specific embodiment of the present invention.

[0047] Figure 9 Schematic diagram of the working state when two piezoelectric films, a control system, a coil winding, and a metal sheet cooperate with each other according to a specific embodiment of the present invention.

[0048] In the figure: 1. Base housing; 2. Friction wall surface; 201. Insulating material; 202. Thin metal plate; 3. Lateral buffer mechanism; 301. Support platform; 302. Magnetorheological fluid; 303. Buffer ring wall; 304. Sleeve; 305. Piston; 306. First spring; 307. First piezoelectric film; 308. Second piezoelectric film; 309. Through hole; 310. Cavity; 4. High-strength elastomer; 5. Axial buffer mechanism; 501. Mounting connecting plate; 502. Connecting rod; 503. Slide block; 504. Slide rail; 505. Second spring; 506. Limit column; 507. Vibration damping device. Specific implementation mode

[0049] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] It should be noted that the terms used herein are only for describing the specific implementation mode and are not intended to limit the exemplary implementation mode of the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0052] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn according to actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc., are generally based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description. Without contrary statements, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention: The orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0054] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc., can be used here to describe the spatial positional relationships of one device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0055] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without otherwise stating, these words have no special meaning and should not be construed as limiting the scope of protection of the present invention.

[0056] Embodiment 1

[0057] Reference appendix Figures 1-7 Figures 1-7 , the present invention provides a main - passive composite universal vibration isolation base, which includes a base shell 1, a friction wall surface 2, a lateral buffer mechanism 3, a high - strength elastomer 4 and an axial buffer mechanism 5; the bottom of the base shell 1 is connected to the vibration source by bolts, the friction wall surface 2 is locked and fixedly connected to the inner wall of the base shell 1, and the lateral buffer mechanism 3 is interference - fitted (abutted) to the inner wall of the friction wall surface 2; the upper part of the high - strength elastomer 4 is elastically connected to the bottom of the lateral buffer mechanism 3, the top of the lateral buffer mechanism 3 is connected to the vibration - isolated object by bolts; the lower part of the high - strength elastomer 4 is elastically connected to the top of the axial buffer mechanism 5, and the bottom of the axial buffer mechanism 5 is connected to the bottom inside the base shell 1 through a card slot. The lateral buffer mechanism 3 and the axial buffer mechanism 5 constitute a passive damping mechanism, the lateral buffer mechanism 3 is provided with a magnetorheological fluid adjustment structure, the friction wall surface 2 is provided with a friction damping adjustment structure, and the magnetorheological fluid adjustment structure and the friction damping adjustment structure constitute an active adjustment mechanism.

[0058] Among them, the lateral buffer mechanism 3 includes a support platform 301, a magnetorheological fluid 302, a buffer ring wall 303, a sleeve 304, a piston 305 and a first spring 306. The radii of the cylindrical (upper and lower column segments) on both axial sides of the support platform 301 are larger than the radius of the middle column segment, presenting a dumbbell shape. An annular groove is formed between the outer side of the middle column segment and the upper and lower column segments. The magnetorheological fluid 302 is placed in the middle section of the support platform 301 and in the annular groove. The inner side of the magnetorheological fluid 302 fits the middle column segment of the support platform 301. The buffer ring wall 303 is placed in the annular groove and is connected to the friction wall surface 2 through interference fit to generate interference pressure, and the buffer ring wall 303 is constrained between the two column segments of the support platform 301 to limit the movement of the platform. At the same time, a plurality of through - holes 309 are arranged at intervals along the circumferential direction on the inner side of the buffer ring wall 303. A plurality of sleeves 304 are provided and distributed in a circumferential manner. The sleeves 304 are partially fixedly connected to the buffer ring wall 303 through the through - holes 309; a plurality of pistons 305 are respectively connected to the plurality of sleeves 304. The piston 305 includes a head, a piston rod and a handle. The two ends of the piston rod are respectively connected to the head and the handle. The head is placed inside the sleeve 304. The piston rod of the piston 305 penetrates the sleeve 304, and the handle is located outside the sleeve 304 and abuts the magnetorheological fluid 302. The first spring 306 is sleeved on the piston rod of the piston 305 and is placed (abutted) between the outer shell of the sleeve 304 and the handle of the piston 305; the sleeve 304 can form two chambers under the partition of the piston 305 head, one is an air chamber, and the other is a liquid chamber / air chamber.

[0059] Among them, the axial buffer mechanism 5 includes a mounting connecting plate 501, a connecting rod 502, a slider 503, a slide rail 504, a second spring 505, a limit column 506 and a damping device 507. A circular groove is formed at the center of the bottom of the mounting connecting plate 501 to abut against the top of the damping device 507. Four pin holes are symmetrically formed on the side wall of the bottom of the mounting connecting plate 501 to hinge four connecting rods 502. The four connecting rods 502 are circumferentially distributed around the damping device 507. The two ends of each connecting rod 502 are respectively hinged to the mounting connecting plate 501 and the top of the slider 503. There are four sliders 503, and the four sliders 503 are circumferentially distributed and constrained to slide above the slide rail 504. The slide rail 504 is in a cross shape, and the bottom of the slide rail 504 is embedded in the card slot in the base housing 1 and thus fixedly connected to the bottom of the base housing 1. At the same time, four limit columns 506 are arranged along the circumference at the cross ends of the slide rail 504. A guide rod is provided at the front end of each slider 503, and the guide rod penetrates through the corresponding limit column 506. The second spring 505 is sleeved on the guide rod and abuts between the slider 503 and the limit column 506 to constrain the movement path of the second spring 505. The top of the damping device 507 is connected to the circular groove at the bottom of the mounting connecting plate 501, and the bottom of the damping device 507 is connected to the cross center of the slide rail 504 through a countersunk bolt.

[0060] Refer to the appendix Figures 2-6 , on the outer circumferential surface of the magnetorheological fluid 302 near the handle, a first piezoelectric film 307 is bonded using a high-strength adhesive, and the magnetorheological fluid 302 abuts against the handle of the piston 305 through the first piezoelectric film 307; the center position of the first piezoelectric film 307 faces the piston 305 and is distributed in an array form to sense the lateral vibration signal. The voltages generated by the first piezoelectric film 307 at different positions are not the same. And since the first piezoelectric film 307 is connected to the first input channel of the control system, the control system can judge the lateral vibration situation according to the voltage form, including but not limited to amplitude, frequency and vibration direction; grooves are formed on the side surfaces of the upper and lower column sections of the support platform 301 to bond the coil windings, and the coil windings are respectively connected to the first output channel of the control system to form a closed loop, so as to generate a magnetic field to adjust the damping and stiffness of the magnetorheological fluid 302. The mutual cooperation of the first piezoelectric film 307, the control system, the coil windings and the magnetorheological fluid 302 constitutes a magnetorheological fluid adjustment structure.

[0061] Refer to the appendix Figures 2-6, on the upper and lower sides (upper surface and lower surface) of the buffer ring wall 303, the second piezoelectric film 308 is bonded using a high-strength adhesive, and the buffer ring wall 303 abuts against the support platform 301 through the second piezoelectric film 308; the second piezoelectric film 308 senses the longitudinal vibration signal, and the voltages generated by the second piezoelectric films 308 on the upper and lower sides are not the same under different vibration conditions, and since the second piezoelectric film 308 is connected to the second input channel of the control system, the control system can judge the longitudinal vibration situation according to the voltage form; the friction wall surface 2 is selected as an electrorheological elastomer, and on the upper and lower sides of the friction wall surface 2, from the inside to the outside, an insulating material 201 and a metal thin plate 202 are sequentially connected. The metal thin plate 202 is connected to the second output channel of the control system to form a parallel plate capacitor to generate a directional electric field, and the electrorheological elastomer changes the molecular arrangement form under the action of the electric field, thereby changing the surface friction coefficient of the friction wall surface 2. The mutual cooperation of the second piezoelectric film 308, the control system, the insulating material 201, the metal thin plate 202, the friction wall surface 2 and the buffer ring wall 303 constitutes a friction damping adjustment structure.

[0062] Reference appendix Figure 2 , circular grooves are opened at the centers of the bottom of the support platform 301 and the top of the installation connecting plate 501 to place the high-strength elastic body 4, which has a centering effect, thereby reducing the mutual influence between the support platform 301 and the installation connecting plate 501.

[0063] Reference appendix Figures 2-6 , an annular cavity 310 is provided inside the buffer ring wall 303, and gas or liquid is filled in the cavity 310 to generate viscous resistance. The interiors of the multiple sleeves 304 are connected through the cavity 310 to achieve a pressure interconnection design. Each sleeve 304 and the corresponding piston 305 can form a pressure interconnection system through the cavity 310 structure, avoiding local stress and improving the stability and reliability of the vibration isolation base. And a sealing rubber / sealing ring is provided between the inner wall of the through hole 309 and the outer wall of the sleeve 304 and between the inner wall of the sleeve 304 and the outer wall of the head of the piston 305 to form a closed system (closed air chamber or closed liquid chamber) to prevent the gas or liquid from overflowing.

[0064] Embodiment 2

[0065] Reference appendix Figure 8 , using the above-mentioned main-passive composite universal vibration isolation base for vibration suppression, including the following steps:

[0066] 1) The bottom of the base housing 1 is connected to the vibration source by bolts, and the top of the support platform 301 is connected to the vibration isolation object by bolts;

[0067] 2) The vibration source starts to vibrate, and the vibration signal is transmitted upward or inward through the base structure to the piezoelectric film of the transverse buffer mechanism 3. The piezoelectric film senses the vibration signal in real time and transmits the signal to the control system;

[0068] 3) The control system analyzes the vibration signal in real time. First, it determines whether there is an instantaneous large-amplitude vibration. If so, the system will immediately activate the coordinated operation of the active and passive vibration isolation technologies. Passive aspect: The slider 503 of the axial buffer mechanism 5 approaches the limit column 506 along the slide rail 504 to buffer the vibration, and the second spring 505 reaches the compression limit. Active aspect: The control system instantaneously increases the stiffness and damping of the magnetorheological fluid 302 to prevent damage to the main structure.

[0069] 4) If there is no instantaneous large-amplitude vibration, the control system will further determine the vibration frequency. When the vibration frequency is lower than the set threshold, the control system activates the active adjustment mechanism. When the vibration frequency is higher than the set threshold, the control system selects the passive damping mechanism.

[0070] 5) The piezoelectric film and the control system cooperate with each other to monitor the vibration signal in real time, and repeat the above control process to form a closed-loop control, effectively suppressing the vibration transmission and ensuring the stability of the system.

[0071] The working principle of the present invention:

[0072] The lateral vibration causes the interaction between the piston 305 handle and the magnetorheological fluid 302 to change, and the axial vibration causes the interaction between the support platform 301 and the buffer ring wall 303 to change. According to the piezoelectric effect, the first piezoelectric film 307 and the second piezoelectric film 308 can transmit the vibration signal to the control system in the form of voltage. The control system judges the amplitude and frequency according to the voltage form, activates the active adjustment mechanism for low-frequency vibration, and selects the passive damping mechanism for high-frequency vibration, thus effectively avoiding resonance and greatly improving the robustness of the system.

[0073] Passive damping mechanism: ① The lateral vibration is mainly transmitted to the buffer ring wall 303 through the base housing 1 and the friction wall surface 2, disturbing the air or liquid in the cavity 310 to initially absorb the vibration energy. At this time, a relative displacement occurs between the piston 305 and the buffer ring wall 303 to abut against the magnetorheological fluid 302, and the additional damping is provided by the viscous characteristics of the magnetorheological fluid 302 to further absorb the vibration wave. ② The axial vibration is mainly transmitted upward through the base housing 1 and the slide rail 504 in the card slot. The second spring 505 can convert the vibration energy into elastic potential energy for storage and dissipate the vibration energy in combination with the damping device 507. At the same time, the axial vibration energy is also further dissipated by the frictional damping generated by the friction wall surface 2 and the buffer ring wall 303.

[0074] Active adjustment mechanism: ① Adjustment of magnetorheological fluid 302: The coil winding is located in the side grooves of the upper and lower column sections of the support platform 301 and is connected to the control system to form a closed loop. The control system adjusts the output current according to the vibration signal to adjust the magnetic field strength, so that the viscosity of the magnetorheological fluid 302 changes dynamically with the vibration frequency to achieve active suppression of low-frequency vibration; ② Adjustment of friction wall surface 2: The friction wall surface 2 selects an electrorheological elastomer, and the insulating material 201 and the metal thin plate 202 are sequentially connected to the upper and lower sides. The two metal thin plates 202 are connected to the control system to form a parallel plate capacitor. The control system adjusts the electric field strength between the metal thin plates 202 according to the vibration signal to change the surface friction coefficient of the friction wall surface 2 and optimize the friction damping.

[0075] Reference appendix Figure 9 , the control system of the present invention can adopt an existing control system, which is mainly composed of an STM32 microcontroller (the specific model can be selected as STM32F103C8T6 / STM32F407ZGT6), and can be divided into the following five modules: (1) Voltage signal amplification module: The voltage signal generated by the piezoelectric film is amplified by a high-precision operational amplifier to reach the STM32 signal adaptation range; (2) Voltage signal acquisition module: The amplified voltage signals are respectively converted into digital signals through ADC channel 1 (the first signal input channel) and ADC channel 2 (the second signal input channel) in the STM32 and then transmitted to the STM32 chip for analysis; (3) Control signal output module: If the data analyzed by the STM32 chip is lower than the specified threshold, a control current or a control voltage will be output at the corresponding interface. The PWM output channel (the first signal input channel) outputs the current, and the DAC output channel (the second signal output channel) outputs the voltage; (4) Serial communication module: The collected signals are transmitted to the upper computer for storage; (5) Power supply module: It can provide power for the control system.

[0076] The piezoelectric film generates a voltage signal when encountering vibration. Since the voltage generated by the piezoelectric film is too small to be analyzed, the voltage signal needs to be amplified by the voltage signal amplification module, and then converted into a digital signal by the analog-to-digital conversion channel in the STM32 microcontroller and then transmitted to the STM32 chip for analysis. If it is lower than the specified threshold, a control current or a control voltage will be output at the corresponding interface. The current output by the PWM output channel is transmitted to the coil winding through an external drive circuit (MOS tube) to generate a magnetic field, thereby increasing the stiffness and damping of the magnetorheological fluid, and thus reducing vibration. The voltage output by the DAC output channel is transmitted to the metal thin plate to generate an electric field, thereby adjusting the surface friction coefficient of the friction wall surface, and thus consuming vibration energy. In addition, if the vibration signal analyzed by the STM32 chip meets the standard of instantaneous large-amplitude vibration, it will control the corresponding interface to output a control current to realize the coordinated operation of passive and active vibration isolation technologies to prevent device damage.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A main-passive composite universal vibration isolation base, characterized in that, Comprising: A base housing (1), a friction wall surface (2), a lateral buffer mechanism (3), a high-strength elastomer (4), and an axial buffer mechanism (5). The bottom of the base housing (1) is connected to a vibration source. The friction wall surface (2) is installed on the inner wall of the base housing (1). The lateral buffer mechanism (3) abuts against the inner wall of the friction wall surface (2). The vibration isolation object is connected to the top of the lateral buffer mechanism (3). The upper part of the high-strength elastomer (4) is elastically connected to the bottom of the lateral buffer mechanism (3). The lower part of the high-strength elastomer (4) is elastically connected to the top of the axial buffer mechanism (5). The bottom of the axial buffer mechanism (5) is connected to the bottom inside the base housing (1); The lateral buffer mechanism (3) and the axial buffer mechanism (5) constitute a passive damping mechanism. The lateral buffer mechanism (3) is provided with a magnetorheological fluid adjustment structure. The friction wall surface (2) is provided with a friction damping adjustment structure. The magnetorheological fluid adjustment structure and the friction damping adjustment structure constitute an active adjustment mechanism.

2. The active and passive composite universal vibration isolation base according to claim 1, wherein The lateral buffer mechanism (3) includes a support platform (301), a magnetorheological fluid (302), a buffer ring wall (303), a plurality of sleeves (304), a plurality of pistons (305), and a plurality of first springs (306). The axial upper and lower column sections of the support platform (301) have a radius larger than that of the middle column section, presenting a dumbbell shape. An annular groove is formed between the outer side of the middle column section and the upper and lower column sections. The magnetorheological fluid (302) is sleeved on the middle column section and placed in the annular groove. The inner side of the magnetorheological fluid (302) fits against the middle column section of the support platform (301). The buffer ring wall (303) is placed in the annular groove and is connected to the inner wall of the friction wall surface (2) by interference fit to generate an interference pressure. A plurality of through holes (309) are spaced apart circumferentially on the inner side of the buffer ring wall (303). The plurality of sleeves (304) are circumferentially distributed and are respectively fixed in the plurality of through holes (309); The plurality of pistons (305) are respectively connected in cooperation with the plurality of sleeves (304). The piston (305) includes a head, a piston rod, and a handle. The two ends of the piston rod are respectively connected to the head and the handle. The head is placed inside the sleeve (304). The piston rod penetrates through the end of the sleeve (304) away from the friction wall surface (2). The handle is located outside the sleeve (304) and abuts against the magnetorheological fluid (302). The first spring (306) is sleeved on the piston rod and abuts between the sleeve (304) and the handle; A first circular groove is opened at the center of the bottom of the support platform (301). The top of the high-strength elastomer (4) is connected to the first circular groove.

3. The active and passive compound universal vibration isolation base according to claim 2, wherein, An annular cavity (310) is provided inside the buffer ring wall (303). The cavity (310) is filled with gas or liquid. The interiors of the multiple sleeves (304) are communicated through the cavity (310). Each sleeve (304) and the corresponding piston (305) form a pressure interconnection system through the cavity (310). Sealing rubber / sealing rings are respectively provided between the inner wall of the through hole (309) and the outer wall of the sleeve (304) and between the inner wall of the sleeve (304) and the outer wall of the head of the piston (305) to form a sealed gas chamber or a sealed liquid chamber.

4. The active and passive composite universal vibration isolation base according to claim 1, wherein The axial buffer mechanism (5) includes a mounting connecting plate (501), multiple connecting rods (502), multiple sliders (503), a slide rail (504), multiple second springs (505), multiple limit columns (506), and a damping device (507). A circular groove is opened at the center of the bottom of the mounting connecting plate (501). The top of the damping device (507) is fixedly connected in the circular groove. The bottom of the damping device (507) is connected to the center of the slide rail (504). The bottom of the slide rail (504) is embedded and fixed in a card slot at the bottom of the base housing (1). Multiple pin holes are symmetrically opened at the bottom of the mounting connecting plate (501). One ends of the multiple connecting rods (502) are respectively hinged to the multiple pin holes. The other ends of the multiple connecting rods (502) are respectively hinged to the tops of the multiple sliders (503). The multiple connecting rods (502) are circumferentially distributed around the damping device (507); The multiple sliders (503) are circumferentially distributed and are all slidably connected above the slide rail (504). Multiple limit columns (506) are provided along the circumference at the outer end of the slide rail (504). Guide rods are provided at the front ends of the sliders (503). The multiple guide rods respectively penetrate and are connected to the multiple limit columns (506). The second spring (505) is sleeved on the guide rod and abuts between the slider (503) and the limit column (506); A second circular groove is opened at the center of the top of the mounting connecting plate (501). The bottom of the high-strength elastomer (4) is connected to the second circular groove.

5. The active and passive composite universal vibration isolation base according to claim 2, wherein A first piezoelectric film (307) is adhesively bonded to the outer circumferential surface of the magnetorheological fluid (302) near the handle portion through a high-strength adhesive. The first piezoelectric film (307) is provided between the magnetorheological fluid (302) and the handle portion; the center position of the first piezoelectric film (307) faces the piston (305) and is distributed in an array form to sense lateral vibration signals. The first piezoelectric film (307) is connected to the control system.

6. The active and passive composite universal vibration isolation base according to claim 5, characterized in that Grooves are opened on the outer sides of the upper and lower column sections of the support platform (301). Coil windings are adhesively bonded in the grooves. The coil windings are connected to the control system to form a closed loop, generating a magnetic field to adjust the damping and stiffness of the magnetorheological fluid (302); the mutual cooperation of the first piezoelectric film (307), the control system, the coil windings, and the magnetorheological fluid (302) constitutes a magnetorheological fluid adjustment structure.

7. The active and passive composite universal vibration isolation base according to claim 2, characterized in that The upper and lower surfaces of the buffer ring wall (303) are bonded with a second piezoelectric film (308) through a high-strength adhesive. The second piezoelectric film (308) is arranged between the buffer ring wall (303) and the support platform (301); the second piezoelectric film (308) is connected to the control system.

8. The active and passive composite universal vibration isolation base according to claim 7, wherein The friction wall surface (2) is selected as an electrorheological elastomer. The upper and lower sides of the friction wall surface (2) are sequentially connected with an insulating material (201) and a metal thin plate (202) from the inside to the outside. The metal thin plate (202) is connected to the control system. The mutual cooperation of the second piezoelectric film (308), the control system, the insulating material (201), the metal thin plate (202), the friction wall surface (2) and the buffer ring wall (303) constitutes a friction damping adjustment structure.

9. A vibration suppression method for the active and passive composite universal vibration isolation base according to any one of claims 1-8, characterized in that, It includes the following steps: Step 1: The bottom of the base housing (1) is connected to the vibration source by bolts, and the top of the support platform (301) of the lateral buffer mechanism (3) is connected to the vibration isolation object by bolts; Step 2: The vibration source starts to vibrate, and the vibration signal is transmitted upward or inward through the base structure to the piezoelectric film of the lateral buffer mechanism (3). The piezoelectric film senses the vibration signal in real time and transmits the signal to the control system; Step 3: The control system analyzes the vibration signal in real time. First, it judges whether there is an instantaneous large-amplitude vibration. If it occurs, the system will immediately start the active and passive vibration isolation technologies to work together. Passive level: The slider (503) of the axial buffer mechanism (5) approaches the limit column (506) along the slide rail (504) to buffer the vibration, and the second spring (505) reaches the compression limit; Active level: The control system instantaneously increases the stiffness and damping of the magnetorheological fluid (302) to prevent the main structure from being damaged; Step 4: If there is no instantaneous large-amplitude vibration, the control system will further judge the vibration frequency. When the vibration frequency is lower than the set threshold, the control system activates the active adjustment mechanism; when the vibration frequency is higher than the set threshold, the control system selects the passive damping mechanism; Step 5: The piezoelectric film and the control system cooperate with each other to monitor the vibration signal in real time, and repeat the above control process to form a closed-loop control, effectively suppressing the vibration transmission and ensuring the stability of the system.

10. The vibration suppression method of the active and passive composite universal vibration isolation base according to claim 9, characterized in that In the said Step 4, the passive damping mechanism includes: The lateral vibration is transmitted to the buffer ring wall (303) through the base housing (1) and the friction wall surface (2). The air or liquid in the disturbance cavity (310) initially absorbs the vibration energy. At this time, a relative displacement occurs between the piston (305) and the buffer ring wall (303) to abut against the magnetorheological fluid (302), and the viscous characteristics of the magnetorheological fluid (302) are used to provide additional damping to further absorb the vibration wave; The axial vibration is transmitted upward through the base housing (1) and the slide rail (504) in the card slot. The second spring (505) converts the vibration energy into elastic potential energy for storage, and combines with the damping device (507) to dissipate the vibration energy. At the same time, the axial vibration energy is further dissipated through the friction damping generated by the friction wall surface (2) and the buffer ring wall (303); The active adjustment mechanism includes: Magnetorheological fluid (302) adjustment: The coil winding is connected to the control system to form a closed loop. The control system adjusts the output current according to the vibration signal to adjust the magnetic field strength, so that the viscosity of the magnetorheological fluid (302) changes dynamically with the vibration frequency to achieve active suppression of low-frequency vibration; Friction wall surface (2) adjustment: The friction wall surface (2) selects electro-rheological elastomers. The metal thin plates (202) on both sides are connected to the control system to form a parallel plate capacitor. The control system adjusts the electric field strength between the metal thin plates (202) according to the vibration signal, thereby changing the surface friction coefficient of the friction wall surface (2) and optimizing the friction damping.

Images