Active-passive hybrid isolation integrated flange and control method

Abstract

The application discloses an integrated flange for active and passive hybrid vibration isolation and a control method thereof. The integrated flange comprises an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuator module, a sensing module and a control module. The application adopts a closed-loop control method to control the extension and contraction amplitudes and frequencies of eight piezoelectric actuators. The micro-vibration generated by the operation of a steering engine is isolated and reduced during the transmission from the inner ring to the outer ring of the flange. The application can realize high-precision and high-efficiency active control of the structural vibration generated by the steering engine in low-frequency and high-frequency modes. The integrated design of damping buffer and piezoelectric actuator control, active vibration isolation and passive vibration isolation can effectively control the micro-vibration generated by the system in low-frequency and high-frequency modes. The application has high reliability, can bear large torque, has high precision, simple structure and high support stiffness, and can be widely applied in the fields of aerospace, navigation and precise driving.

Description

Technical Field

[0001] This invention relates to the field of micro-vibration isolation technology, and in particular to an integrated flange for radial micro-vibration active-passive hybrid vibration isolation based on piezoelectric drive. Background Technology

[0002] Vibration interference is a significant factor affecting the pointing accuracy, stable operation, and precision strike capabilities of missiles, aircraft, and other similar devices. These devices operate in unique environments with limited internal space and high overall structural rigidity requirements. The vibrations generated by motors during operation are minimal, and the vibration control frequency band is low, making control extremely challenging. Therefore, there are specific and stringent requirements for the complexity, reliability, and stability of the vibration control system.

[0003] Numerous measures, including various active and passive vibration isolation schemes, have been proposed both domestically and internationally to address vibration interference issues. Currently, active vibration isolation is mostly studied and applied in the design of vibration isolation platforms in aerospace fields such as satellites, and is deployed between platforms and at truss connections. These devices generate low-frequency micro-vibrations during operation, making active vibration isolation more effective for vibration control. For ring-shaped structures such as torpedoes, rolling mill rollers, and air bearings, passive vibration isolation is generally used. While this method is more suitable for high-frequency vibration control, its efficiency is lower at lower operating frequencies, affecting the reliability and stability of equipment operation and intelligent control. Therefore, this paper designs a hybrid active-passive vibration isolation system and its control method for ring structures, employing a combined active and passive vibration isolation approach to achieve more reliable vibration control across the entire frequency range for such equipment.

[0004] Currently, active vibration isolation systems generally employ electromagnetic, hydraulic, and piezoelectric methods. Electromagnetic drives are susceptible to magnetic field interference, while hydraulic mechanisms require significant space. Piezoelectric actuators, based on the inverse piezoelectric effect, offer advantages such as small size, fast response, self-locking upon power failure, and high electromechanical conversion efficiency. Therefore, the trend towards miniaturization, micro-miniaturization, and integration of equipment is increasingly evident, leading to widespread attention and research on active, semi-active, and passive vibration control technologies based on piezoelectric materials. Among these, piezoelectric active vibration isolation, although complex to control, offers superior isolation performance. Utilizing piezoelectric materials and employing a hybrid vibration isolation method combining active and passive isolation to achieve vibration control of annular flange structures holds significant research importance and broad application prospects in today's rapidly developing scientific and technological landscape both domestically and internationally. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies mentioned in the background art by providing an integrated flange and control method for active and passive hybrid vibration isolation.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An integrated flange with active and passive hybrid vibration isolation includes an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuation module, a sensing module, and a control module.

[0008] Both the inner and outer rings are hollow cylinders with openings at both ends;

[0009] The inner ring has M first countersunk through holes evenly distributed circumferentially on its inner wall, and the outer ring has M second countersunk through holes evenly distributed circumferentially on its outer wall. The piezoelectric actuation module includes M piezoelectric actuation units. The first countersunk through holes, piezoelectric actuation units, and second countersunk through holes correspond one-to-one, and M is a natural number greater than or equal to 3.

[0010] The piezoelectric actuation unit includes a first bolt, a second bolt, a first nut, a second nut, a connector, and a piezoelectric actuator;

[0011] The tail end of the piezoelectric actuator is provided with a threaded blind hole that matches the second bolt;

[0012] The connector is cylindrical, with a threaded blind hole at the center of one end for fixing to the actuating foot of the piezoelectric actuator, and a flat-bottomed blind hole at the center of the other end for engaging with the stud of the first bolt.

[0013] The stud of the first bolt passes through the first countersunk through hole and the first nut corresponding to the piezoelectric actuator in sequence and then extends into the flat-bottomed blind hole of the connector. The first bolt and the first nut are threadedly connected, so that the nut of the first bolt is fixed in the first countersunk through hole corresponding to the piezoelectric actuator. The stud of the second bolt passes through the second countersunk through hole corresponding to the piezoelectric actuator and is threadedly connected to the threaded blind hole at the tail end of the piezoelectric actuator, thereby fixing the piezoelectric actuator on the inner wall of the outer ring.

[0014] The connector is coaxially fixed to the piezoelectric actuator via its threaded blind hole;

[0015] The second nut is disposed between the first nut and the connector, and is threadedly connected to the first bolt. One side of the second nut abuts against the end of the connector away from the piezoelectric actuator, and is used to adjust the preload of the piezoelectric actuator.

[0016] The first bolt, connector, piezoelectric actuator, and second bolt are all coaxial, and their axes pass through the center of the inner ring; the M piezoelectric actuation units are coplanar.

[0017] The passive vibration isolation module contains 2N passive vibration isolation units;

[0018] The passive vibration isolation unit includes a third bolt, a damper, and a fourth bolt. The damper is a regular prism or cylinder, one end of which is coaxially fixed to the nut of the fourth bolt, and the center of the other end face is provided with a threaded blind hole for mating with the third bolt.

[0019] The first and second webs have the same structure, both being annular;

[0020] The first and second webs are arranged parallel to each other between the inner and outer rings. The outer walls of both webs are coaxially and fixedly connected to the inner wall of the outer ring. Each web has N mounting holes evenly distributed circumferentially, and the bottom center of each mounting hole has a threaded blind hole. The N mounting holes on the first web correspond one-to-one with N of the 2N passive vibration isolation units, and the N mounting holes on the second web correspond one-to-one with the other N of the 2N passive vibration isolation units.

[0021] The inner wall of the inner ring is provided with N countersunk through holes that correspond one-to-one with the N mounting holes on the first web plate and N mounting holes that correspond one-to-one with the N mounting holes on the second web plate.

[0022] The damper and the fourth bolt of the passive vibration isolation unit are set in their corresponding mounting holes. The fourth bolt is threadedly connected to the threaded blind hole at the center of the bottom surface of the mounting hole. The third bolt passes through its corresponding third countersunk through hole and is threadedly connected to the threaded blind hole on the damper, thus fixing the damper to the outer wall of the inner ring.

[0023] The sensing module includes a first to a fourth acceleration sensor, wherein the first and second acceleration sensors are disposed on the inner ring, and the third and fourth acceleration sensors are disposed on the outer ring. Let the line where the first and third acceleration sensors are located be a, and the line where the second and fourth acceleration sensors are located be b. Then, lines a and b both pass through the center of the inner ring, and lines a and b are perpendicular to each other.

[0024] The control module is connected to the first to fourth acceleration sensors and the piezoelectric actuators of the M piezoelectric actuation units, respectively, and is used to control the piezoelectric actuators of the M piezoelectric actuation units to work based on the sensing data of the first to fourth acceleration sensors.

[0025] As a further optimization of the integrated flange for active and passive hybrid vibration isolation of the present invention, several through holes are uniformly provided circumferentially on both the first web plate and the second web plate to reduce weight.

[0026] As a further optimization of the integrated flange for active and passive hybrid vibration isolation of the present invention, both the first nut and the second nut are anti-loosening nuts to prevent loosening and slippage during operation.

[0027] As a further optimization of the integrated flange for active and passive hybrid vibration isolation of the present invention, let the plane where the M piezoelectric actuation units are located be plane L. Then the inner ring and the outer ring are symmetrical about plane L, and the first web plate is symmetrical about plane L and the second web plate.

[0028] As a further optimization of the integrated flange for active-passive hybrid vibration isolation of the present invention, M is 8 and N is 8.

[0029] This invention also discloses a control method for the integrated flange with active-passive hybrid vibration isolation, comprising the following steps:

[0030] Step 1) Let the eight piezoelectric actuators be arranged in a clockwise direction as the first to the eighth piezoelectric actuators. Establish a polar coordinate system with the center of the inner ring as the origin, the axis of the first piezoelectric actuator as the y-direction, and the axis of the third piezoelectric actuator as the x-direction.

[0031] Step 2): The control module calculates the vibration interference frequency Freq based on the sensing signals from the first to fourth accelerometers. in Amplitude r and angle θ;

[0032] Step 3): The control module calculates the displacements ΔL1, ΔL2, ΔL3, ΔL4, ΔL5, ΔL6, ΔL7, and ΔL8 of the inner and outer rings on the axes of the first to eighth piezoelectric actuators based on r and θ.

[0033]

[0034] but In the formula, ΔL'1, ΔL'2, ΔL'3, ΔL'4, ΔL'5, ΔL'6, ΔL'7, and ΔL'8 are the vibration response displacements that the first to eighth piezoelectric actuation units need to generate, respectively.

[0035]

[0036] Step 4), the control module sets the frequency Freq in Compare with the preset maximum operating frequency threshold Freq1, if Freq in If the value is less than or equal to Freq1, the control module controls the piezoelectric actuators of the first to eighth piezoelectric actuation units to work, generating vibration response displacements ΔL'1, ΔL'2, ΔL'3, ΔL'4, ΔL'5, ΔL'6, ΔL'7, and ΔL'8 respectively.

[0037] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0038] 1. This invention designs and optimizes the structure of traditional support flanges used in general aircraft or missile propulsion systems. By precisely designing and arranging piezoelectric actuators and passive vibration isolation devices in the flange space, and using a hybrid active and passive vibration isolation method, it can control and attenuate the vibration interference generated during the operation of the propulsion device across the entire frequency band. It is suitable for fields such as industrial production, underwater propulsion, and aerospace that require vibration isolation of ring flange structures.

[0039] 2. This invention uses piezoelectric actuators as the excitation source for piezoelectric actuation devices in an active vibration isolation system. This results in fast response speed and high precision. Multiple piezoelectric actuation devices arranged circumferentially work together, allowing for timely changes in input frequency, voltage, and drive mode to control vibration and adjust performance in the face of multi-source, multi-directional vibration interference. Furthermore, piezoelectric actuators are small in size, have high thrust, and are unaffected by electromagnetic interference, making them suitable for confined spaces and complex environments where electromagnetic motors and hydraulic mechanisms are unsuitable.

[0040] 3. Based on the principle of vibration isolation, this invention designs a closed-loop control system suitable for the integrated vibration-damping flange. By constructing the closed-loop controller, it is expected to improve the vibration control effect within the operating frequency band of the integrated vibration-damping flange and achieve closed-loop control of vibration, thereby realizing more comprehensive vibration control performance. This will further enhance the system's performance and application potential, providing strong support for vibration control research and practical applications in related fields. Attached Figure Description

[0041] Figure 1 This is a top view of the present invention;

[0042] Figure 2 This is a partial cross-sectional view and enlarged structural schematic diagram of the present invention;

[0043] Figure 3 This is a schematic diagram illustrating the structure and working principle of the piezoelectric actuator in this invention;

[0044] Figure 4 This is a schematic diagram of the deformation and control modeling analysis of the present invention under vibration disturbance;

[0045] Figure 5 This is a schematic diagram illustrating the vibration control simulation effect of the present invention.

[0046] In the figure, 1-outer ring, 2-piezoelectric actuation unit, 3-inner ring, 4-first web plate, 5-passive vibration isolation unit, 6-first bolt, 7-second bolt, 8-first nut, 9-second nut, 10-connector, 11-piezoelectric actuator, 12-third bolt, 13-damper, 14-fourth bolt. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0048] This invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully express the scope of the invention to those skilled in the art. In the drawings, components are enlarged for clarity.

[0049] like Figure 1 , Figure 2 As shown, the present invention discloses an integrated flange with active and passive hybrid vibration isolation, comprising an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuation module, a sensing module, and a control module;

[0050] Both the inner and outer rings are hollow cylinders with openings at both ends;

[0051] The inner ring has M first countersunk through holes evenly distributed circumferentially on its inner wall, and the outer ring has M second countersunk through holes evenly distributed circumferentially on its outer wall. The piezoelectric actuation module includes M piezoelectric actuation units. The first countersunk through holes, piezoelectric actuation units, and second countersunk through holes correspond one-to-one, and M is a natural number greater than or equal to 3.

[0052] The piezoelectric actuation unit includes a first bolt, a second bolt, a first nut, a second nut, a connector, and a piezoelectric actuator;

[0053] The tail end of the piezoelectric actuator is provided with a threaded blind hole that matches the second bolt;

[0054] The connector is cylindrical, with a threaded blind hole at the center of one end for fixing to the actuating foot of the piezoelectric actuator, and a flat-bottomed blind hole at the center of the other end for engaging with the stud of the first bolt.

[0055] The stud of the first bolt passes through the first countersunk through hole and the first nut corresponding to the piezoelectric actuator in sequence and then extends into the flat-bottomed blind hole of the connector. The first bolt and the first nut are threadedly connected, so that the nut of the first bolt is fixed in the first countersunk through hole corresponding to the piezoelectric actuator. The stud of the second bolt passes through the second countersunk through hole corresponding to the piezoelectric actuator and is threadedly connected to the threaded blind hole at the tail end of the piezoelectric actuator, thereby fixing the piezoelectric actuator on the inner wall of the outer ring.

[0056] The connector is coaxially fixed to the piezoelectric actuator via its threaded blind hole;

[0057] The second nut is disposed between the first nut and the connector, and is threadedly connected to the first bolt. One side of the second nut abuts against the end of the connector away from the piezoelectric actuator, and is used to adjust the preload of the piezoelectric actuator.

[0058] The first bolt, connector, piezoelectric actuator, and second bolt are all coaxial, and their axes pass through the center of the inner ring; the M piezoelectric actuation units are coplanar.

[0059] The passive vibration isolation module contains 2N passive vibration isolation units;

[0060] The passive vibration isolation unit includes a third bolt, a damper, and a fourth bolt. The damper is a regular prism or cylinder, one end of which is coaxially fixed to the nut of the fourth bolt, and the center of the other end face is provided with a threaded blind hole for mating with the third bolt.

[0061] The first and second webs have the same structure, both being annular;

[0062] The first and second webs are arranged parallel to each other between the inner and outer rings. The outer walls of both webs are coaxially and fixedly connected to the inner wall of the outer ring. Each web has N mounting holes evenly distributed circumferentially, and the bottom center of each mounting hole has a threaded blind hole. The N mounting holes on the first web correspond one-to-one with N of the 2N passive vibration isolation units, and the N mounting holes on the second web correspond one-to-one with the other N of the 2N passive vibration isolation units.

[0063] The inner wall of the inner ring is provided with N countersunk through holes that correspond one-to-one with the N mounting holes on the first web plate and N mounting holes that correspond one-to-one with the N mounting holes on the second web plate.

[0064] The damper and the fourth bolt of the passive vibration isolation unit are set in their corresponding mounting holes. The fourth bolt is threadedly connected to the threaded blind hole at the center of the bottom surface of the mounting hole. The third bolt passes through its corresponding third countersunk through hole and is threadedly connected to the threaded blind hole on the damper, thus fixing the damper to the outer wall of the inner ring.

[0065] The sensing module includes a first to a fourth acceleration sensor, wherein the first and second acceleration sensors are disposed on the inner ring, and the third and fourth acceleration sensors are disposed on the outer ring. Let the line where the first and third acceleration sensors are located be a, and the line where the second and fourth acceleration sensors are located be b. Then, lines a and b both pass through the center of the inner ring, and lines a and b are perpendicular to each other.

[0066] The control module is connected to the first to fourth acceleration sensors and the piezoelectric actuators of the M piezoelectric actuation units, respectively, and is used to control the piezoelectric actuators of the M piezoelectric actuation units to work based on the sensing data of the first to fourth acceleration sensors.

[0067] Both the first and second webs are provided with several through holes evenly distributed around their circumference to reduce weight.

[0068] Both the first nut and the second nut are anti-loosening nuts to prevent loosening and slippage during operation.

[0069] Let plane L be the plane containing the M piezoelectric actuators. Then, the inner and outer rings are symmetrical about plane L, and the first web is symmetrical about plane L and the second web. M and N are preferably both taken as 8.

[0070] The piezoelectric actuator includes a piezoelectric stack, an actuating foot, a disc spring, and a housing. The size of the piezoelectric stack is related to the length of the selected piezoelectric actuator; the wider the cross-sectional ceramic sheet of the piezoelectric stack, the greater the output thrust. The longer the piezoelectric actuator, the more layers and the greater the thickness of the piezoelectric stack. The shape of the actuating foot is related to the connection method of the connecting device. The connection method used in the experimental case in this paper is a threaded connection, so the end of the actuating foot is machined with a corresponding thread. The shape and size of the disc spring and the housing are selected and matched according to the size of the piezoelectric actuator and the application.

[0071] The piezoelectric stack is composed of stacked piezoelectric ceramic sheets, with adjacent piezoelectric ceramic sheets in each layer having opposite polarization directions. The silver layer ends of two spaced-apart ceramic sheets are respectively grounded and connected to a voltage signal of a certain amplitude and frequency. For example... Figure 3 As shown, in operation, when a piezoelectric signal u1 is input to the piezoelectric actuator, the actuator's actuating foot extends or retracts accordingly, with an extension value of x1. After power is cut off, the actuating foot returns to its initial position. By adjusting the signal amplitude and frequency input to the piezoelectric actuator, the extension or retraction state of the actuator can be changed, thereby altering the elongation of the actuating foot and thus suppressing the vibration propagating from the inner ring to the outer ring of the flange during motor operation.

[0072] The maximum operating frequency threshold of the piezoelectric stack is preset to Freq1. If the operating frequency of the piezoelectric stack exceeds Freq1, significant hysteresis and rapid heating occur. Therefore, this invention also discloses a control method for this integrated flange with active-passive hybrid vibration isolation, comprising the following steps:

[0073] Step 1) Let the eight piezoelectric actuators be arranged in a clockwise direction as the first to the eighth piezoelectric actuators. Establish a polar coordinate system with the center of the inner ring as the origin, the axis of the first piezoelectric actuator as the y-direction, and the axis of the third piezoelectric actuator as the x-direction.

[0074] Step 2), such as Figure 4 As shown, the control module calculates the vibration interference frequency Freq based on the sensing signals from the first to fourth accelerometers. in Amplitude r and angle θ;

[0075] Step 3): The control module calculates the displacements ΔL1, ΔL2, ΔL3, ΔL4, ΔL5, ΔL6, ΔL7, and ΔL8 of the inner and outer rings on the axes of the first to eighth piezoelectric actuators based on r and θ.

[0076]

[0077] but In the formula, ΔL'1, ΔL'2, ΔL'3, ΔL'4, ΔL'5, ΔL'6, ΔL'7, and ΔL'8 are the vibration response displacements that the first to eighth piezoelectric actuation units need to generate, respectively.

[0078]

[0079] Step 4), the control module sets the frequency Freq in Compare with the preset maximum operating frequency threshold Freq1, if Freq in If the value is less than or equal to Freq1, the control module controls the piezoelectric actuators of the first to eighth piezoelectric actuation units to work, generating vibration response displacements ΔL'1, ΔL'2, ΔL'3, ΔL'4, ΔL'5, ΔL'6, ΔL'7, and ΔL'8 respectively.

[0080] Vibration response displacement ΔL' of piezoelectric actuator i The output performance of the piezoelectric stack used in the piezoelectric actuator and the frequency and voltage of the external input driving signal determine the vibration response displacement of the piezoelectric actuator. Under a pulse input signal, the vibration response displacement of the piezoelectric actuator is approximately linearly related to the voltage of the input driving signal, and this linear relationship corresponds to the proportionality value k. i Determined by the output performance of the piezoelectric stack, its expression is:

[0081] ΔL' i =k i u i

[0082] In the formula, ΔL' i k represents the vibration response displacement of the i-th piezoelectric actuator. i The proportionality coefficient, u, represents the linear relationship between the vibration response displacement of the corresponding piezoelectric actuator and the voltage of the input drive signal. i This indicates the voltage value of the input drive electrical signal.

[0083] The frequency of the vibration control signal is related to the external vibration interference. An external source (similar to the vibration generated by a motor) provides vibration interference to the inner ring of the flange. The signal collected by the accelerometer is analyzed to obtain the frequency, amplitude, and direction of the main vibration interference signal. The frequency of the vibration control signal is consistent with the frequency of the main vibration interference signal, and its expression is:

[0084] Freq 输入 =Freq in

[0085] Under a simple harmonic input signal, the vibration response displacement of the piezoelectric actuator is related to the frequency of the input driving signal. Under the same driving voltage, the vibration response displacement of the piezoelectric actuator will decrease as the frequency increases. The expression for this is:

[0086] ΔL' i =k Freq k i u i

[0087] In the formula, k Freq This represents the proportionality coefficient between the vibration response displacement of the piezoelectric actuator at the frequency of the input harmonic drive electrical signal and the vibration response displacement of the piezoelectric actuator at the frequency of the input pulse drive electrical signal.

[0088] Vibration control simulation of an integrated vibration-damping flange structure in a free state was performed using simulation software. In the simulation, simple harmonic vibration disturbance was applied to the inner ring of the flange. The piezoelectric actuators in the first to eighth piezoelectric actuators were respectively connected to corresponding bias DC signals. The input voltage frequency and phase were the same as the frequency and phase of the disturbance vibration, thus damping the disturbance excitation on the inner ring of the flange. In the experimental embodiment, the voltage amplitude was 0–150 Vpp; the adjusted voltage frequency could meet the requirements from low to high frequencies. In the experimental embodiment, the voltage frequency was 0–2000 Hz, thus ensuring attenuation of the vibration disturbance transmission from the inner ring to the outer ring of the flange when the motor rotates and the inner ring of the flange structure generates vibration disturbance. Figure 5 As shown.

[0089] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0090] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated flange of active-passive hybrid vibration isolation, characterized in that, The application relates to a passive vibration isolation device, which comprises an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuation module, a sensing module and a control module. The inner ring and the outer ring are both hollow cylinders with open ends. M first countersunk through holes are evenly arranged on the inner wall of the inner ring in the circumferential direction, and M second countersunk through holes are evenly arranged on the outer wall of the outer ring in the circumferential direction; the piezoelectric actuation module comprises M piezoelectric actuation units, and the first countersunk through hole, the piezoelectric actuation unit and the second countersunk through hole are one-to-one corresponding; M is a natural number greater than or equal to 3. The piezoelectric actuation unit comprises a first bolt, a second bolt, a first nut, a second nut, a connecting piece and a piezoelectric actuator. The tail end of the piezoelectric actuator is provided with a threaded blind hole matched with the second bolt. The connecting piece is in a cylindrical shape, one end of which is provided with a threaded blind hole for fixing the contact foot of the piezoelectric actuator, and the other end is provided with a flat-bottomed blind hole for matching the stud of the first bolt. The stud of the first bolt passes through the corresponding first countersunk through hole of the piezoelectric actuation unit and the first nut and then extends into the flat-bottomed blind hole of the connecting piece, the first bolt and the first nut are threadedly connected, and the nut of the first bolt is fixed in the corresponding first countersunk through hole of the piezoelectric actuation unit; the stud of the second bolt passes through the corresponding second countersunk through hole of the piezoelectric actuation unit and is threadedly connected with the threaded blind hole at the tail end of the piezoelectric actuator, so that the piezoelectric actuator is fixed on the inner wall of the outer ring. The connecting piece is coaxially fixed with the piezoelectric actuator through the threaded blind hole. The second nut is arranged between the first nut and the connecting piece, is threadedly connected with the first bolt, and one side of the second nut abuts against one end of the connecting piece away from the piezoelectric actuator, so as to adjust the pre-pressure of the piezoelectric actuator. The first bolt, the connecting piece, the piezoelectric actuator and the second bolt are coaxial and the axis passes through the center of the inner ring; the M piezoelectric actuation units are coplanar. The passive vibration isolation module comprises 2N passive vibration isolation units. The passive vibration isolation unit comprises a third bolt, a damper and a fourth bolt, wherein the damper is a right prism or a cylinder, one end of the damper is coaxially fixed with the nut of the fourth bolt, and the other end is provided with a threaded blind hole at the center of the end face for matching the third bolt. The first web and the second web are the same in structure and are in the shape of a circular ring. The first web and the second web are arranged in parallel between the inner ring and the outer ring, the outer walls of the first web and the second web are coaxially fixed with the inner wall of the outer ring, the inner walls of the first web and the second web are both evenly provided with N mounting holes in the circumferential direction, and the bottom surface center of each mounting hole is provided with a threaded blind hole; the N mounting holes on the first web correspond to N passive vibration isolation units in the 2N passive vibration isolation units one-to-one, and the N mounting holes on the second web correspond to another N passive vibration isolation units in the 2N passive vibration isolation units one-to-one. The inner wall of the inner ring is respectively and evenly provided with N third countersunk through holes corresponding to the N mounting holes on the first web and the N mounting holes on the second web in the circumferential direction. The damper of the passive vibration isolation unit, the fourth bolt is arranged in the corresponding mounting hole, the fourth bolt and the threaded blind hole in the center of the bottom surface of the mounting hole are threadedly connected, the third bolt is threadedly connected with the threaded blind hole on the damper after penetrating through the corresponding third countersunk hole, and the damper is fixed on the outer wall of the inner ring; The induction module comprises first to fourth acceleration sensors, wherein the first and second acceleration sensors are arranged on the inner ring, the third and fourth acceleration sensors are arranged on the outer ring, a straight line where the first and third acceleration sensors are located is a, a straight line where the second and fourth acceleration sensors are located is b, the straight lines a and b both pass through the center of the inner ring, and the straight lines a and b are perpendicular to each other. The control module is electrically connected with the first to fourth acceleration sensors and the piezoelectric actuators of the M piezoelectric actuating units, and is used for controlling the piezoelectric actuators of the M piezoelectric actuating units to work according to the sensing data of the first to fourth acceleration sensors.

2. The active-passive hybrid isolated integrated flange of claim 1, wherein, The first web and the second web are both circumferentially and uniformly provided with a plurality of through holes to reduce the weight.

3. The active-passive hybrid isolated integrated flange of claim 1, wherein, The first nut and the second nut are both lock nuts, so as to avoid loosening and sliding during work.

4. The active-passive hybrid isolated integrated flange of claim 1, wherein, The plane where the M piezoelectric actuating units are located is plane L, the inner ring and the outer ring are symmetrical about the plane L, and the first web is symmetrical about the plane L and the second web.

5. The active-passive hybrid isolated integrated flange of claim 1, wherein, M is 8 and N is 8.

6. The method of controlling an active-passive hybrid isolated flange according to claim 5, wherein The method comprises the following steps: Step 1), the eight piezoelectric actuating units are sequentially arranged in a clockwise direction as the first to eighth piezoelectric actuating units, an polar coordinate system is established with the center of the inner ring as the origin, the axis of the first piezoelectric actuating unit as the y direction, and the axis of the third piezoelectric actuating unit as the x direction; Step 2), the control module calculates the frequency Freq, the amplitude r and the angle θ of the vibration disturbance according to the sensing signals of the first to fourth acceleration sensors in ​ Step 3), the control module calculates the displacements ΔL1, ΔL2, ΔL3, ΔL4, ΔL5, ΔL6, ΔL7 and ΔL8 of the inner ring and the outer ring on the axes of the first to eighth piezoelectric actuating units according to r and θ: wherein ΔL'1, ΔL'2, ΔL'3, ΔL'4, ΔL'5, ΔL'6, ΔL'7 and ΔL'8 are respectively the vibration response displacements required by the first to eighth piezoelectric actuating units. ​ Step 4), the control module compares the frequency Freq in with the preset maximum operating frequency threshold Freq1, if Freq in is less than or equal to Freq1, the control module controls the piezoelectric actuators of the first to eighth piezoelectric actuating units to work, respectively generating vibration response displacements AL'1, AL'2, AL'3, AL'4, AL'5, AL'6, AL'7, AL'8.

Images