CN118274055A - Active vibration isolation flange based on piezoelectric driving and control method - Google Patents
Active vibration isolation flange based on piezoelectric driving and control method Download PDFInfo
- Publication number
- CN118274055A CN118274055A CN202410482257.9A CN202410482257A CN118274055A CN 118274055 A CN118274055 A CN 118274055A CN 202410482257 A CN202410482257 A CN 202410482257A CN 118274055 A CN118274055 A CN 118274055A
- Authority
- CN
- China
- Prior art keywords
- piezoelectric
- nut
- bolt
- inner ring
- connecting piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001133 acceleration Effects 0.000 claims abstract description 41
- 230000006698 induction Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 16
- 239000000919 ceramic Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses an active vibration isolation flange based on piezoelectric driving and a control method thereof, wherein the active vibration isolation flange comprises an inner ring, an outer ring, a first web, a second web, a piezoelectric actuation module, an induction module and a control module; the first web plate and the second web plate are arranged in parallel between the inner ring and the outer ring; the piezoelectric actuation module comprises M piezoelectric actuation units which are circumferentially and uniformly arranged between the inner ring and the outer ring; 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 sensing module comprises first to fourth acceleration sensors; the control module controls the piezoelectric actuators of the M piezoelectric actuating units to work according to the sensing data of the first acceleration sensor, the second acceleration sensor and the third acceleration sensor respectively. The invention can realize the active control of micro-vibration generated by the system in a low-frequency mode, has high reliability, large bearing torque, high precision, simple structure and high supporting rigidity, and can be widely applied to the fields of aerospace navigation, precise driving and the like.
Description
Technical Field
The invention relates to the technical field of micro-vibration isolation, in particular to a radial micro-vibration active vibration isolation flange based on piezoelectric driving and a control method.
Background
Vibration interference is an important factor affecting pointing accuracy, smooth running, and accurate striking of devices such as missiles, aircraft, and the like. The working environment of the equipment has specificity, the space in the cabin section is smaller, the rigidity requirement of the whole structure is high, the vibration generated by the motor in the running process is tiny, the vibration control frequency band is low, and the control difficulty is great. Therefore, there are special and strict requirements on the complexity, reliability, stability, etc. of the vibration control system.
A number of measures have been proposed at home and abroad for the problem of vibration disturbances, including various active and passive vibration isolation schemes. At present, most of active vibration isolation researches are applied to the aviation fields such as satellites and the like to design a vibration isolation platform, the vibration isolation platform is arranged between the platforms and at the truss connection position, micro-vibration frequency generated in the running process of the equipment is low, and the active vibration isolation is adopted to achieve a better vibration control effect. At present, for torpedo, rolling mill idler wheels, air bearings and other annular structure equipment, a passive vibration isolation mode is generally adopted, and is more suitable for vibration control of a high frequency band, but when the working frequency band is lower, the vibration isolation efficiency of passive vibration isolation measures is lower, and the reliability and stability of equipment work and intelligent control are affected. Therefore, an active and passive hybrid vibration isolation system with an annular structure and a control method thereof are designed, and a system vibration isolation mode of matching the active and passive vibration isolation systems is adopted to realize more reliable vibration control of the whole frequency band for the equipment.
At present, an active vibration isolation system generally adopts electromagnetic, hydraulic, piezoelectric and other modes, wherein electromagnetic driving is easily influenced by magnetic field interference and the like, the requirement of a hydraulic mechanism on space is large, and a driver prepared from piezoelectric materials works based on the inverse piezoelectric effect, and has the advantages of small volume, quick response, outage self-locking, high electromechanical conversion efficiency and the like. Accordingly, the trend of miniaturization, miniaturization and integration of devices is increasingly remarkable, and active, semi-active and passive vibration control technologies based on piezoelectric materials are receiving extensive attention and research by experts. The piezoelectric active vibration isolation has the advantages that the vibration control is complex, but the vibration isolation effect is good. The piezoelectric material is utilized to realize vibration control of the annular flange structure, and the piezoelectric material has important research significance and wide application prospect in the current stage of rapid development of domestic and foreign science and technology.
Disclosure of Invention
The invention aims to solve the technical problem of providing an active vibration isolation flange based on piezoelectric driving and a control method thereof aiming at the defects related to the background technology.
The invention adopts the following technical scheme for solving the technical problems:
an active vibration isolation flange based on piezoelectric driving comprises an inner ring, an outer ring, a first web plate, a second web plate, a piezoelectric actuation module, an induction module and a control module;
The first web plate and the second web plate have the same structure and are in ring shapes;
The inner ring and the outer ring are hollow cylinders with openings at two ends; the first web plate and the second web plate are arranged between the inner ring and the outer ring in parallel, the inner walls are coaxially and fixedly connected with the outer wall of the inner ring, and the outer walls are coaxially and fixedly connected with the inner wall of the outer ring;
M first countersunk through holes are uniformly formed in the circumferential direction on the inner wall of the inner ring, M second countersunk through holes are uniformly formed in the circumferential direction on the outer wall of the outer ring, the piezoelectric actuation module comprises M piezoelectric actuation units, the first countersunk through holes, the piezoelectric actuation units and the second countersunk through holes are in one-to-one correspondence, and M is a natural number which is more 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 cylindrical, a threaded blind hole for being fixedly connected with a touch foot of the piezoelectric actuator is formed in the center of one end of the connecting piece, and a flat-bottom blind hole for being matched with a stud of the first bolt is formed in the center of the other end of the connecting piece;
The stud of the first bolt sequentially passes through the first countersunk through hole and the first nut corresponding to the piezoelectric actuating unit and then stretches into the flat-bottom blind hole of the connecting piece, and the first bolt is connected with the first nut in a threaded manner, so that the nut of the first bolt is fixed in the first countersunk through hole corresponding to the piezoelectric actuating unit; the stud of the second bolt passes through a second countersunk through hole corresponding to the piezoelectric actuating unit and then is in threaded connection 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 and fixedly connected with the piezoelectric actuator through a threaded blind hole of the connecting piece;
the second nut is arranged between the first nut and the connecting piece and is in threaded connection with the first bolt, one side of the second nut abuts against one end of the connecting piece, which is far away from the piezoelectric actuator, and the second nut is used for adjusting 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 sensing 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, the straight line of the first and third acceleration sensors is a, the straight line of the second and fourth acceleration sensors is b, the straight lines a and b pass through the center of the inner ring, and the straight lines a and b are mutually perpendicular;
the control module is respectively connected with the first acceleration sensor, the second acceleration sensor 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 acceleration sensor, the second acceleration sensor and the third acceleration sensor.
As a further optimization scheme of the active vibration isolation flange based on piezoelectric driving, a plurality of through holes are uniformly formed in the circumferential direction of each of the first web plate and the second web plate so as to reduce weight.
As a further optimization scheme of the active vibration isolation flange based on piezoelectric driving, the first nut and the second nut adopt locknuts, so that looseness and sliding in working are avoided.
As a further optimization scheme of the active vibration isolation flange based on piezoelectric driving, the plane where M piezoelectric actuating units are located is the 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.
As a further optimization scheme of the active vibration isolation flange based on piezoelectric driving, the M is 8.
The piezoelectric actuator comprises a disc spring, a driving foot, a piezoelectric stack and a shell, wherein the piezoelectric stack is composed of piezoelectric ceramic plates, the size of the piezoelectric stack is related to the length of the selected piezoelectric actuator, and the larger the width of the section ceramic plates of the piezoelectric stack is, the larger the output thrust is; the longer the length of the piezoelectric actuator, the more layers the piezoelectric stack has, and the greater the thickness. The polarization directions of each layer of adjacent piezoelectric ceramic plates are opposite, and when the piezoelectric actuator works, the end surfaces of silver layers of the two spaced ceramic plates are respectively grounded and connected with voltage signals with certain amplitude and frequency.
The invention also discloses a control method of the active vibration isolation flange based on piezoelectric driving, which comprises the following steps:
Step 1), 8 piezoelectric actuating units are sequentially first to first eight piezoelectric actuating units according to a clockwise direction, the center of an inner ring is taken as an origin, the axis of the first piezoelectric actuating unit is taken as a y direction, and the axis of the third piezoelectric actuating unit is taken as an x direction to establish a polar coordinate system;
Step 2), the control module calculates the frequency Freq in, the amplitude r and the angle theta of vibration interference according to the induction signals of the first acceleration sensor to the fourth acceleration sensor;
Step 3), the control module calculates the displacement delta L 1、ΔL2、ΔL3、ΔL4、ΔL5、ΔL6、ΔL7、ΔL8 of the inner ring and the outer ring on the axes of the first to eighth piezoelectric actuating units according to r and theta:
Then Wherein ,ΔL'1、ΔL'2、ΔL'3、ΔL'4、ΔL'5、ΔL'6、ΔL'7、ΔL'8 is the vibration response displacement required to be generated by the first to eighth piezoelectric actuation units respectively;
Step 4), the control module controls the piezoelectric actuators of the first to eighth piezoelectric actuating units to work and respectively generate vibration response displacement ΔL'1、ΔL'2、ΔL'3、ΔL'4、ΔL'5、ΔL'6、ΔL'7、ΔL'8.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
1. According to the invention, structural design and optimization are carried out according to the traditional support flange used by a general aircraft or missile propulsion system, and the piezoelectric actuating device arranged in the flange space is precisely designed, so that vibration interference generated in the running process of the propulsion device can be controlled and attenuated by adopting an active vibration isolation method, and the invention is suitable for the fields of industrial production, underwater propulsion, aerospace and the like which need annular flange structure vibration isolation;
2. The piezoelectric actuator is adopted as an excitation source of the piezoelectric actuating device in the active vibration isolation system, so that the piezoelectric vibration isolation system has high response speed and higher precision, and a plurality of piezoelectric actuating devices which are circumferentially arranged are adopted to cooperatively work, so that the input frequency, the voltage and the driving mode can be timely changed to perform vibration control and performance adjustment in the face of multi-source multidirectional vibration interference; on the other hand, the piezoelectric actuator has small size, large thrust and no electromagnetic interference, and can be applied to special complex environments which cannot be applied to small spaces, electromagnetic motors, hydraulic mechanisms and the like;
3. The invention designs a closed-loop control system suitable for the integrated vibration reduction and isolation flange according to the vibration isolation principle, and is expected to improve the vibration control effect in the working frequency band of the integrated vibration reduction and isolation flange and realize the closed-loop control of vibration by building the closed-loop controller, thereby realizing more comprehensive vibration control performance. The system further improves the performance and application potential of the system, and provides powerful support for vibration control research and practical application in the related field.
Drawings
FIG. 1 is a top view of the present invention with a first web removed;
FIG. 2 is a schematic view in partial cross-section of the present invention with the first web removed;
FIG. 3 is a schematic diagram of the operation of the piezoelectric actuator in the piezoelectric actuator of the present invention;
FIG. 4 is a schematic diagram of a modeling analysis of deformation and control of the invention subject to vibration disturbance;
fig. 5 is a schematic diagram of the results of the vibration control simulation of the present invention.
In the figure, the first ring, the second ring, the first web, the second web, the first bolt, the second bolt, the first nut, the second nut, the connecting piece and the piezoelectric actuator are respectively arranged on the first ring, the second ring, the first web, the second web, the first bolt, the second bolt, the first nut, the second nut, the connecting piece and the piezoelectric actuator.
Detailed Description
For better understanding of the technical scheme of the present invention, the following detailed description of the technical scheme of the present invention is provided for those skilled in the art with reference to the accompanying drawings:
this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the components are exaggerated for clarity.
As shown in fig. 1, the invention discloses an active vibration isolation flange based on piezoelectric driving, which comprises an inner ring, an outer ring, a first web, a second web, a piezoelectric actuation module, an induction module and a control module;
The first web plate and the second web plate have the same structure and are in ring shapes;
As shown in fig. 2, the inner ring and the outer ring are hollow cylinders with two open ends; the first web plate and the second web plate are arranged between the inner ring and the outer ring in parallel, the inner walls are coaxially and fixedly connected with the outer wall of the inner ring, and the outer walls are coaxially and fixedly connected with the inner wall of the outer ring;
M first countersunk through holes are uniformly formed in the circumferential direction on the inner wall of the inner ring, M second countersunk through holes are uniformly formed in the circumferential direction on the outer wall of the outer ring, the piezoelectric actuation module comprises M piezoelectric actuation units, the first countersunk through holes, the piezoelectric actuation units and the second countersunk through holes are in one-to-one correspondence, and M is a natural number which is more 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 cylindrical, a threaded blind hole for being fixedly connected with a touch foot of the piezoelectric actuator is formed in the center of one end of the connecting piece, and a flat-bottom blind hole for being matched with a stud of the first bolt is formed in the center of the other end of the connecting piece;
The stud of the first bolt sequentially passes through the first countersunk through hole and the first nut corresponding to the piezoelectric actuating unit and then stretches into the flat-bottom blind hole of the connecting piece, and the first bolt is connected with the first nut in a threaded manner, so that the nut of the first bolt is fixed in the first countersunk through hole corresponding to the piezoelectric actuating unit; the stud of the second bolt passes through a second countersunk through hole corresponding to the piezoelectric actuating unit and then is in threaded connection 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 and fixedly connected with the piezoelectric actuator through a threaded blind hole of the connecting piece;
the second nut is arranged between the first nut and the connecting piece and is in threaded connection with the first bolt, one side of the second nut abuts against one end of the connecting piece, which is far away from the piezoelectric actuator, and the second nut is used for adjusting 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 sensing 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, the straight line of the first and third acceleration sensors is a, the straight line of the second and fourth acceleration sensors is b, the straight lines a and b pass through the center of the inner ring, and the straight lines a and b are mutually perpendicular;
the control module is respectively connected with the first acceleration sensor, the second acceleration sensor 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 acceleration sensor, the second acceleration sensor and the third acceleration sensor.
And a plurality of through holes are uniformly formed in the first web plate and the second web plate in the circumferential direction so as to reduce weight.
The first nut and the second nut are locknuts, so that looseness and sliding in work are avoided.
Let M piezoelectricity action unit place plane be plane L, then inner ring, outer loop are all symmetrical about plane L, and first web is symmetrical each other with second web about plane L. The M takes 8 preferentially.
The piezoelectric actuator comprises a piezoelectric stack, an actuating foot, a disc spring and a shell; the size of the piezoelectric stack is related to the length of the selected piezoelectric actuator, and the larger the width of the ceramic plates of the section of the piezoelectric stack is, the larger the output thrust is; the longer the length of the piezoelectric actuator, the more layers the piezoelectric stack has, and the greater the thickness; the shape of the actuating foot is related to the connection mode of the connecting device, and the connection mode is threaded connection in the experimental case, so that the end part of the actuating foot is provided with corresponding threads; the shape and size of the disc spring and housing are selected and matched according to the size and use of the piezoelectric actuator.
The piezoelectric stack is composed of laminated piezoelectric ceramic plates, the polarization directions of every two adjacent piezoelectric ceramic plates are opposite, and the silver layer end faces of the two spaced ceramic plates are respectively grounded and connected with voltage signals with certain amplitude and frequency. As shown in fig. 3, in the working state, a piezoelectric signal u 1 is input to the piezoelectric actuator, the actuating foot of the piezoelectric actuator stretches correspondingly, the stretching value is x 1, and after the power is off, the actuating foot of the piezoelectric actuator returns to the initial position. The stretching state of the piezoelectric actuator can be changed by adjusting the amplitude and the frequency of the signal input into the piezoelectric actuator, so that the elongation of the actuating foot is changed, and the vibration propagated from the inner ring to the outer ring of the flange in the running process of the motor is correspondingly restrained;
The invention also discloses a control method of the active vibration isolation flange based on piezoelectric driving, which adopts a vibration control method for isolating the vibration, when the inner ring of the flange is disturbed in a certain direction caused by the operation of a motor, the piezoelectric actuating device at the position pointed by the direction contracts, and the piezoelectric actuating device in the opposite direction extends. For example: when the flange inner ring is disturbed in the vertical upward direction, the piezoelectric actuating device at the upper part contracts, and the piezoelectric actuating device at the lower part extends; when the flange inner ring is disturbed in the vertical downward direction, the upper piezoelectric actuator stretches, and the lower piezoelectric actuator contracts, so that interference vibration transmitted to the outer ring is reduced.
The method comprises the following specific steps:
Step 1), 8 piezoelectric actuating units are sequentially first to first eight piezoelectric actuating units according to a clockwise direction, the center of an inner ring is taken as an origin, the axis of the first piezoelectric actuating unit is taken as a y direction, and the axis of the third piezoelectric actuating unit is taken as an x direction to establish a polar coordinate system;
Step 2), the control module calculates the frequency Freq in, the amplitude r and the angle theta of vibration interference according to the induction signals of the first acceleration sensor to the fourth acceleration sensor, as shown in fig. 4;
Step 3), the control module calculates the displacement delta L 1、ΔL2、ΔL3、ΔL4、ΔL5、ΔL6、ΔL7、ΔL8 of the inner ring and the outer ring on the axes of the first to eighth piezoelectric actuating units according to r and theta:
Then Wherein ,ΔL'1、ΔL'2、ΔL'3、ΔL'4、ΔL'5、ΔL'6、ΔL'7、ΔL'8 is the vibration response displacement required to be generated by the first to eighth piezoelectric actuation units respectively;
Step 4), the control module controls the piezoelectric actuators of the first to eighth piezoelectric actuating units to work and respectively generate vibration response displacement ΔL'1、ΔL'2、ΔL'3、ΔL'4、ΔL'5、ΔL'6、ΔL'7、ΔL'8.
The vibration response displacement Δl' i of the piezoelectric actuator is determined by the output performance of the piezoelectric stack used in the piezoelectric actuator and the frequency and voltage of the external input driving electrical signal. Under the pulse input signal, the vibration response displacement of the piezoelectric actuator and the voltage of the input driving electric signal approximately form a linear relation, the corresponding proportional value k i of the linear relation is determined by the output performance of the piezoelectric stack, and the expression is as follows:
ΔL’i＝kiui
Where Δl' i denotes the vibration response displacement of the i-th piezoelectric actuator, k i denotes the proportionality coefficient of the vibration response displacement of the corresponding piezoelectric actuator to the voltage linear relationship of the input drive electric signal, and u i denotes the voltage value of the input drive electric signal.
The frequency of the vibration control signal is related to the vibration interference of the outside, the outside (similar to the motor working to generate vibration) is interfered with the inner ring of the flange, the frequency, the amplitude and the direction of the main signal of the vibration interference are obtained by analyzing the signal collected by the acceleration sensor, the frequency of the vibration control signal is consistent with the frequency of the main signal of the vibration interference, and the expression is as follows:
Freq Input device ＝Freqin
Under a simple harmonic input signal, the vibration response displacement of the piezoelectric actuator is related to the frequency of the input driving electric signal, and under the same driving voltage, the vibration response displacement of the piezoelectric actuator is attenuated along with the increase of the frequency, and the expression is as follows:
ΔL’i＝kFreqkiui
where k Freq represents a proportionality coefficient of the vibration response displacement of the piezoelectric actuator at the frequency of the input harmonic drive electric signal to the vibration response displacement of the input pulse drive electric signal piezoelectric actuator.
The method comprises the steps of adopting simulation software to perform vibration control simulation on an active vibration isolation flange structure based on piezoelectric driving in a free state, applying simple harmonic vibration interference to an inner ring of the flange in the simulation, respectively connecting corresponding bias direct current electric signals to piezoelectric actuators in corresponding first to eighth piezoelectric actuating devices, inputting voltage with the same frequency and phase as those of interference vibration, and performing amplitude-isolation vibration reduction on interference excitation of the inner ring of the flange. The voltage amplitude of the experimental embodiment is 0-150 Vpp; the adjusted voltage frequency can meet the requirement from low frequency to high frequency, and the voltage frequency of the experimental embodiment is 0-2000 Hz, so that when the motor rotates and the inner ring of the flange structure generates vibration interference, the vibration interference conduction from the inner ring of the flange to the outer ring is attenuated, as shown in figure 5.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (6)
1. The active vibration isolation flange based on piezoelectric driving is characterized by comprising an inner ring, an outer ring, a first web plate, a second web plate, a piezoelectric actuation module, an induction module and a control module;
The first web plate and the second web plate have the same structure and are in ring shapes;
The inner ring and the outer ring are hollow cylinders with openings at two ends; the first web plate and the second web plate are arranged between the inner ring and the outer ring in parallel, the inner walls are coaxially and fixedly connected with the outer wall of the inner ring, and the outer walls are coaxially and fixedly connected with the inner wall of the outer ring;
M first countersunk through holes are uniformly formed in the circumferential direction on the inner wall of the inner ring, M second countersunk through holes are uniformly formed in the circumferential direction on the outer wall of the outer ring, the piezoelectric actuation module comprises M piezoelectric actuation units, the first countersunk through holes, the piezoelectric actuation units and the second countersunk through holes are in one-to-one correspondence, and M is a natural number which is more 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 cylindrical, a threaded blind hole for being fixedly connected with a touch foot of the piezoelectric actuator is formed in the center of one end of the connecting piece, and a flat-bottom blind hole for being matched with a stud of the first bolt is formed in the center of the other end of the connecting piece;
The stud of the first bolt sequentially passes through the first countersunk through hole and the first nut corresponding to the piezoelectric actuating unit and then stretches into the flat-bottom blind hole of the connecting piece, and the first bolt is connected with the first nut in a threaded manner, so that the nut of the first bolt is fixed in the first countersunk through hole corresponding to the piezoelectric actuating unit; the stud of the second bolt passes through a second countersunk through hole corresponding to the piezoelectric actuating unit and then is in threaded connection 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 and fixedly connected with the piezoelectric actuator through a threaded blind hole of the connecting piece;
the second nut is arranged between the first nut and the connecting piece and is in threaded connection with the first bolt, one side of the second nut abuts against one end of the connecting piece, which is far away from the piezoelectric actuator, and the second nut is used for adjusting 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 sensing 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, the straight line of the first and third acceleration sensors is a, the straight line of the second and fourth acceleration sensors is b, the straight lines a and b pass through the center of the inner ring, and the straight lines a and b are mutually perpendicular;
the control module is respectively connected with the first acceleration sensor, the second acceleration sensor 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 acceleration sensor, the second acceleration sensor and the third acceleration sensor.
2. The active vibration isolation flange based on piezoelectric driving according to claim 1, wherein a plurality of through holes are uniformly formed in the first web plate and the second web plate circumferentially so as to reduce weight.
3. The active vibration isolation flange based on piezoelectric driving according to claim 1, wherein the first nut and the second nut are locknuts, so that looseness and sliding in working are avoided.
4. The active vibration isolation flange based on piezoelectric driving according to claim 1, wherein when the plane in which the M piezoelectric actuating units are located is a plane L, the inner ring and the outer ring are symmetrical with respect to the plane L, and the first web is symmetrical with respect to the plane L and the second web.
5. The active vibration isolation flange based on piezoelectric driving according to claim 1, wherein M is 8.
6. The control method of the active vibration isolation flange based on piezoelectric driving according to claim 5, comprising the following steps:
Step 1), 8 piezoelectric actuating units are sequentially first to first eight piezoelectric actuating units according to a clockwise direction, the center of an inner ring is taken as an origin, the axis of the first piezoelectric actuating unit is taken as a y direction, and the axis of the third piezoelectric actuating unit is taken as an x direction to establish a polar coordinate system;
Step 2), the control module calculates the frequency Freq in, the amplitude r and the angle theta of vibration interference according to the induction signals of the first acceleration sensor to the fourth acceleration sensor;
Step 3), the control module calculates the displacement delta L 1、ΔL2、ΔL3、ΔL4、ΔL5、ΔL6、ΔL7、ΔL8 of the inner ring and the outer ring on the axes of the first to eighth piezoelectric actuating units according to r and theta:
Then Wherein ,ΔL'1、ΔL'2、ΔL'3、ΔL'4、ΔL'5、ΔL'6、ΔL'7、ΔL'8 is the vibration response displacement required to be generated by the first to eighth piezoelectric actuation units respectively;
Step 4), the control module controls the piezoelectric actuators of the first to eighth piezoelectric actuating units to work and respectively generate vibration response displacement ΔL'1、ΔL'2、ΔL'3、ΔL'4、ΔL'5、ΔL'6、ΔL'7、ΔL'8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410482257.9A CN118274055A (en) | 2024-04-22 | 2024-04-22 | Active vibration isolation flange based on piezoelectric driving and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410482257.9A CN118274055A (en) | 2024-04-22 | 2024-04-22 | Active vibration isolation flange based on piezoelectric driving and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118274055A true CN118274055A (en) | 2024-07-02 |
Family
ID=91638190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410482257.9A Pending CN118274055A (en) | 2024-04-22 | 2024-04-22 | Active vibration isolation flange based on piezoelectric driving and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118274055A (en) |
-
2024
- 2024-04-22 CN CN202410482257.9A patent/CN118274055A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105909725A (en) | Three degree of freedom micro-vibration suppression platform and control method thereof | |
| CN107992110B (en) | Magnetic suspension control moment gyro frame angular rate servo system based on harmonic reducer | |
| Bailey et al. | Distributed piezoelectric-polymer active vibration control of a cantilever beam | |
| CN106286693B (en) | One kind is applied to large amplitude and wide band active-passive integratedization subtracts isolation mounting | |
| CN112923012B (en) | Micro-vibration suppression platform based on intelligent piezoelectric array and control method thereof | |
| Bin et al. | Theoretical and experimental investigation on novel 2D maglev servo proportional valve | |
| Yu et al. | A direction-guidance hybrid excitation method for inertial flexible hinge piezoelectric actuator with high speed performance | |
| Deng et al. | Design, modeling, and experimental evaluation of a compact piezoelectric XY platform for large travel range | |
| CN206036114U (en) | Main passive integration subtracts isolation mounting suitable for large amplitude and broadband | |
| Ning et al. | A dual-mode excitation method of flexure hinge type piezoelectric stick-slip actuator for suppressing backward motion | |
| CN118274055A (en) | Active vibration isolation flange based on piezoelectric driving and control method | |
| Wang et al. | Modeling and testing of the static deflections of circular piezoelectric unimorph actuators | |
| Giurgiutiu | Active-materials induced-strain actuation for aeroelastic vibration control | |
| CN118242386A (en) | Integrated flange with active and passive hybrid vibration isolation and control method | |
| Mazeika et al. | Disc type piezoelectric motor with two coaxial rotors | |
| Deng et al. | Design and Analysis of A Linear Piezoelectric Actuator Based on The Bridge Displacement Amplifier | |
| Qingsong et al. | Optimal actuator placement for vibration control of two-link piezoelectric flexible manipulator | |
| CN112886860A (en) | Rotary ultrasonic motor based on three-phase piezoelectric stack driving mode | |
| Duan et al. | Design and Experimental Study of a Stepping Piezoelectric Actuator with Large Stroke and High Speed. Micromachines 2023, 14, 267 | |
| Xin et al. | Research of Active Vibration Control for Cantilever Beam Based on Macro Fiber Composite Actuators | |
| Wang et al. | Design and control of a decoupled micro-positioning stage using corrugated flexure units | |
| Wang et al. | Structure Design and Nonlinear Control of a Precision Rotating Stage | |
| CN113212736B (en) | Thin type large-reduction-ratio miniature electric steering engine system | |
| CN114063667A (en) | Passive self-adaptive vibration control method based on pressure sensitive resistor | |
| Zhao et al. | Dynamic modeling and analysis of piezoelectric driving elements of miniature missile steering gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |