CN118242386A - Integrated flange with active and passive hybrid vibration isolation and control method - Google Patents
Integrated flange with active and passive hybrid vibration isolation and control method Download PDFInfo
- Publication number
- CN118242386A CN118242386A CN202410482259.8A CN202410482259A CN118242386A CN 118242386 A CN118242386 A CN 118242386A CN 202410482259 A CN202410482259 A CN 202410482259A CN 118242386 A CN118242386 A CN 118242386A
- Authority
- CN
- China
- Prior art keywords
- piezoelectric
- bolt
- vibration isolation
- nut
- units
- 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 76
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001133 acceleration Effects 0.000 claims description 36
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 17
- 230000006698 induction Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000013016 damping Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000005457 optimization Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000010586 diagram Methods 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
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 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
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses an integrated flange for active and passive hybrid vibration isolation and a control method. The invention adopts a closed-loop control method to control the telescopic amplitude and frequency of eight piezoelectric actuating devices, implements vibration reduction and isolation in the process of transferring micro vibration generated by the operation of the steering engine from the flange inner ring to the flange outer ring, can realize high-precision and high-efficiency active control of structural vibration generated by the steering engine in low-frequency and high-frequency operation, adopts damping buffer and piezoelectric actuating control, active vibration isolation and passive vibration isolation integrated design, can realize effective control of micro vibration generated by the system in a low-frequency mode and a high-frequency mode, has high reliability, high bearing torque, high precision, simple structure, high supporting rigidity and the like, 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 and passive hybrid vibration isolation integrated flange based on piezoelectric driving.
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 vibration control of the annular flange structure is realized by utilizing a piezoelectric material and adopting a hybrid vibration isolation method combining active vibration isolation and passive vibration isolation, and the method has important research significance and wide application prospect in the current stage of rapid development of domestic and foreign scientific technologies.
Disclosure of Invention
The invention aims to solve the technical problem of providing an integrated flange for active and passive hybrid vibration isolation 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 integrated flange with active and passive hybrid vibration isolation comprises an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuation module, an induction module and a control module;
The inner ring and the outer ring are hollow cylinders with openings at two ends;
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 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 regular prism or a cylinder, one end of the damper is coaxially and fixedly connected with a nut of the fourth bolt, and a threaded blind hole matched with the third bolt is formed in the center of the end face of the other end of the damper;
the first web plate and the second web plate have the same structure and are in ring shapes;
The first web plate and the second web plate are arranged between the inner ring and the outer ring in parallel, the outer wall is coaxially and fixedly connected with the inner wall of the outer ring, N mounting holes are uniformly formed in the inner wall in the circumferential direction, and threaded blind holes are formed in the centers of the bottoms of the mounting holes; n mounting holes on the first web plate are in one-to-one correspondence with N passive vibration isolation units in the 2N passive vibration isolation units, and N mounting holes on the second web plate are in one-to-one correspondence with the other N passive vibration isolation units in the 2N passive vibration isolation units
The inner wall of the inner ring is respectively and circumferentially and uniformly provided with N third countersunk through holes which are in one-to-one correspondence with the N mounting holes on the first web plate and N third countersunk through holes which are in one-to-one correspondence with the N mounting holes on the second web plate;
The damper and the fourth bolt of the passive vibration isolation unit are arranged in the corresponding mounting hole, the fourth bolt is fixedly connected with the thread blind hole at the center of the bottom surface of the mounting hole through threads, and the third bolt penetrates through the corresponding third countersunk through hole and is connected with the thread blind hole on the damper through threads, so that the damper is fixed on the outer wall of the inner ring;
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 and passive hybrid vibration isolation integrated flange, a plurality of through holes are uniformly formed in the first web plate and the second web plate circumferentially so as to reduce weight.
As a further optimization scheme of the integrated flange for active and passive hybrid vibration isolation, 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 and passive hybrid vibration isolation integrated flange, the plane where the 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 mutually symmetrical about the plane L and the second web.
As a further optimization scheme of the integrated flange for active and passive hybrid vibration isolation, the M is 8, and the N is 8.
The invention also discloses a control method of the active and passive hybrid vibration isolation integrated flange, 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 compares the frequency Freq in with a preset maximum working frequency threshold Freq 1, and if Freq in is less than or equal to Freq 1, 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 and the passive vibration isolation device which are arranged in a flange space are precisely designed, so that the vibration interference generated in the running process of the propulsion device can be subjected to full-band vibration control and attenuation by adopting an active and passive hybrid 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;
FIG. 2 is a schematic view, partially in section and enlarged, of the structure of the present invention;
FIG. 3 is a schematic view of the structure and operation of 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 vibration control simulation effect of the present invention.
In the figure, the outer ring, the 2-piezoelectric actuating unit, the 3-inner ring, the 4-first web, the 5-passive vibration isolation unit, the 6-first bolt, the 7-second bolt, the 8-first nut, the 9-second nut, the 10-connecting piece, the 11-piezoelectric actuator, the 12-third bolt, the 13-damper and the 14-fourth bolt are shown.
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 and 2, the invention discloses an integrated flange for active and passive hybrid vibration isolation, which comprises an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuation module, an induction module and a control module;
The inner ring and the outer ring are hollow cylinders with openings at two ends;
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 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 regular prism or a cylinder, one end of the damper is coaxially and fixedly connected with a nut of the fourth bolt, and a threaded blind hole matched with the third bolt is formed in the center of the end face of the other end of the damper;
the first web plate and the second web plate have the same structure and are in ring shapes;
The first web plate and the second web plate are arranged between the inner ring and the outer ring in parallel, the outer wall is coaxially and fixedly connected with the inner wall of the outer ring, N mounting holes are uniformly formed in the inner wall in the circumferential direction, and threaded blind holes are formed in the centers of the bottoms of the mounting holes; n mounting holes on the first web plate are in one-to-one correspondence with N passive vibration isolation units in the 2N passive vibration isolation units, and N mounting holes on the second web plate are in one-to-one correspondence with the other N passive vibration isolation units in the 2N passive vibration isolation units
The inner wall of the inner ring is respectively and circumferentially and uniformly provided with N third countersunk through holes which are in one-to-one correspondence with the N mounting holes on the first web plate and N third countersunk through holes which are in one-to-one correspondence with the N mounting holes on the second web plate;
The damper and the fourth bolt of the passive vibration isolation unit are arranged in the corresponding mounting hole, the fourth bolt is fixedly connected with the thread blind hole at the center of the bottom surface of the mounting hole through threads, and the third bolt penetrates through the corresponding third countersunk through hole and is connected with the thread blind hole on the damper through threads, so that the damper is fixed on the outer wall of the inner ring;
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. And each M, N 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;
And if the working frequency of the piezoelectric stack is larger than Freq 1, obvious response hysteresis and rapid heating phenomena occur. The invention further discloses a control method of the active and passive hybrid vibration isolation integrated flange, 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), as shown in fig. 4, the control module calculates the frequency Freq in, the amplitude r and the angle θ of the vibration interference according to the sensing signals of the first to fourth acceleration sensors;
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 compares the frequency Freq in with a preset maximum working frequency threshold Freq 1, and if Freq in is less than or equal to Freq 1, 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.
And the integrated vibration reduction and isolation flange structure in a free state is subjected to vibration control simulation by adopting simulation software, simple harmonic vibration interference is applied to the flange inner ring in the simulation, the piezoelectric actuators in the corresponding first to eighth piezoelectric actuating devices are respectively connected with corresponding bias direct current electric signals, the input voltage frequency and the input voltage phase are the same as the frequency and the input voltage phase of the interference vibration, and the interference excitation of the flange inner ring is subjected to amplitude isolation and vibration reduction. 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 integrated flange is characterized by comprising an inner ring, an outer ring, a first web, a second web, a passive vibration isolation module, a piezoelectric actuation module, an induction module and a control module;
The inner ring and the outer ring are hollow cylinders with openings at two ends;
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 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 regular prism or a cylinder, one end of the damper is coaxially and fixedly connected with a nut of the fourth bolt, and a threaded blind hole matched with the third bolt is formed in the center of the end face of the other end of the damper;
the first web plate and the second web plate have the same structure and are in ring shapes;
The first web plate and the second web plate are arranged between the inner ring and the outer ring in parallel, the outer wall is coaxially and fixedly connected with the inner wall of the outer ring, N mounting holes are uniformly formed in the inner wall in the circumferential direction, and threaded blind holes are formed in the centers of the bottoms of the mounting holes; n mounting holes on the first web plate are in one-to-one correspondence with N passive vibration isolation units in the 2N passive vibration isolation units, and N mounting holes on the second web plate are in one-to-one correspondence with the other N passive vibration isolation units in the 2N passive vibration isolation units
The inner wall of the inner ring is respectively and circumferentially and uniformly provided with N third countersunk through holes which are in one-to-one correspondence with the N mounting holes on the first web plate and N third countersunk through holes which are in one-to-one correspondence with the N mounting holes on the second web plate;
The damper and the fourth bolt of the passive vibration isolation unit are arranged in the corresponding mounting hole, the fourth bolt is fixedly connected with the thread blind hole at the center of the bottom surface of the mounting hole through threads, and the third bolt penetrates through the corresponding third countersunk through hole and is connected with the thread blind hole on the damper through threads, so that the damper is fixed on the outer wall of the inner ring;
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-passive hybrid vibration isolation integrated flange according to claim 1, wherein the first web and the second web are both circumferentially and uniformly provided with a plurality of through holes to reduce weight.
3. The active and passive hybrid vibration isolation integrated flange according to claim 1, wherein the first nut and the second nut are locknuts, so that looseness and sliding during operation are avoided.
4. The integrated flange of claim 1, wherein the M piezoelectric actuation units are located on a plane L, and 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 vibration isolation integrated flange of claim 1, wherein M is 8 and n is 8.
6. The method for controlling the integrated flange based on the active-passive hybrid vibration isolation according to claim 5 is characterized by 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 compares the frequency Freq in with a preset maximum working frequency threshold Freq 1, and if Freq in is less than or equal to Freq 1, 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 |
|---|---|---|---|
| CN202410482259.8A CN118242386A (en) | 2024-04-22 | 2024-04-22 | Integrated flange with active and passive hybrid vibration isolation and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410482259.8A CN118242386A (en) | 2024-04-22 | 2024-04-22 | Integrated flange with active and passive hybrid vibration isolation and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118242386A true CN118242386A (en) | 2024-06-25 |
Family
ID=91554633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410482259.8A Pending CN118242386A (en) | 2024-04-22 | 2024-04-22 | Integrated flange with active and passive hybrid vibration isolation and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118242386A (en) |
-
2024
- 2024-04-22 CN CN202410482259.8A patent/CN118242386A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105909725B (en) | A kind of Three Degree Of Freedom micro-vibration suppresses platform and its control method | |
| US9777793B1 (en) | Six-degree-of-freedom micro vibration suppression platform and control method thereof | |
| CN106286693B (en) | One kind is applied to large amplitude and wide band active-passive integratedization subtracts isolation mounting | |
| CN1252400C (en) | Smart skin structures | |
| Rimašauskienė et al. | Experimental analysis of active–passive vibration control on thin-walled composite beam | |
| CN112923012B (en) | Micro-vibration suppression platform based on intelligent piezoelectric array and control method thereof | |
| CN108827571B (en) | Device and method for detecting and controlling vibration of two-degree-of-freedom flexible arm | |
| Bin et al. | Theoretical and experimental investigation on novel 2D maglev servo proportional valve | |
| CN111963602B (en) | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness | |
| Gao et al. | Development of a novel two-stage proportional valve with a pilot digital flow distribution | |
| Yu et al. | A novel piezoelectric stack for rotary motion by d 15 working mode: Principle, modeling, simulation, and experiments | |
| Li et al. | Step displacement improving method of inertial actuated piezoelectric robot based on diagonal deformation trajectory | |
| Ning et al. | A dual-mode excitation method of flexure hinge type piezoelectric stick-slip actuator for suppressing backward motion | |
| CN118242386A (en) | Integrated flange with active and passive hybrid vibration isolation and control method | |
| Wang et al. | Modeling and testing of the static deflections of circular piezoelectric unimorph actuators | |
| CN107968593B (en) | A kind of four-degree-of-freedom moment of flexure actuator | |
| CN118274055A (en) | Active vibration isolation flange based on piezoelectric driving and control method | |
| CN114952744B (en) | Voice coil motor direct-drive type active vibration isolation and leveling integrated platform | |
| CN211720488U (en) | Sandwich type multi-mode composite rotary piezoelectric actuator | |
| CN115021610B (en) | Piezoelectric active vibration suppression rod with space structure and working method thereof | |
| CN111146971B (en) | Sandwich type multi-mode composite rotary piezoelectric actuator and working method thereof | |
| CN114063667B (en) | Passive self-adaptive vibration control method based on pressure sensitive resistor | |
| Ge et al. | Piezoelectric Active Vibration Control of Space Truss Structure | |
| Wang et al. | Structure Design and Nonlinear Control of a Precision Rotating Stage | |
| CN108288923A (en) | A kind of multiple field rotating piezoelectric precision driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |