CN209925503U - Fork type piezoelectric stack vibration damping ring - Google Patents
Fork type piezoelectric stack vibration damping ring Download PDFInfo
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- CN209925503U CN209925503U CN201822074281.1U CN201822074281U CN209925503U CN 209925503 U CN209925503 U CN 209925503U CN 201822074281 U CN201822074281 U CN 201822074281U CN 209925503 U CN209925503 U CN 209925503U
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- fork
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- piezoelectric stack
- protective frame
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- 238000013016 damping Methods 0.000 title claims abstract description 40
- 230000001681 protective effect Effects 0.000 claims abstract description 16
- 230000010287 polarization Effects 0.000 claims abstract description 9
- 238000005452 bending Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The utility model provides a fork-shaped piezoelectric stack damping ring, which comprises a piezoelectric stack, a fork-shaped protective frame, an outer ring and an external shunt circuit, wherein the fork-shaped protective frame is sleeved on a bearing, the outer ring is sleeved outside the fork-shaped protective frame, and the outer ring is tightly hooped on the fork-shaped protective frame; the fork-shaped protection frame is of a symmetrical annular structure with a concave section, a plurality of piezoelectric stacks are distributed between the inner wall and the outer wall of a concave opening of the concave structure, two end faces of each piezoelectric stack are respectively stuck on the inner wall and the outer wall of the concave opening, and the polarization direction of each piezoelectric stack is the same as the direction of the fork-shaped protection frame receiving the bearing pressure load; all the piezoelectric stacks are connected in parallel and then connected with an external shunt circuit, a resistor and an inductor in series. The utility model discloses can utilize piezoelectricity reposition of redundant personnel damping technique effectively to reduce the vibration that transmission system transmitted the support through axle and bearing to can effectively avoid piezoelectricity to pile up and bear tangential stress and moment of torsion, increase the life that piezoelectricity piled up.
Description
Technical Field
The utility model relates to a vibration damper field is used in the aircraft field rotor system on bearing and bearing frame or mechanical box, specifically is a fork type piezoelectricity piles up damping ring.
Background
The conventional vibration damping devices acting on bearings and bearing blocks have squeeze film dampers and the like. The squeeze film damper is divided into a squeeze film damper with a centering elastic support and a squeeze film damper without the centering elastic support according to whether the journal center and the bearing center are concentric when the rotor does not rotate, and the structural diagram of the squeeze film damper with the elastic support is shown in figure 1. The squeeze film damper absorbs vibration energy to be converted into heat energy and is taken away by lubricating oil, and the effect is very obvious on reducing the vibration of the rotor at the critical rotating speed and transmitted outwards through the bearing. The squeeze film damper has the advantages of simple structure, light weight, small volume, good vibration damping effect and the like. However, the high nonlinearity of the oil film rigidity can cause the phenomena of locking, bistable state and uncoordinated precession of the squeeze film damper in the working process, and the vibration of a transmission system is too large and even fatigue and collision are generated.
The technical discussion of the device is referred to Zhang Jia Zhong, Zheng Tie Sheng, Liu Shi Xue, etc. stability and bifurcation behavior of squeeze film damper-sliding bearing-rigid transmission system, applied mechanics report, 1996,13(4):35 ~ 40.
As shown in fig. 2, researchers at Atzrodt, Mayer, Melz, etc. have mounted piezoelectric stacks in bearings radially to reduce the vibrations transmitted by the drive shaft. The vibration energy transmitted by the bearing can be converted into electric energy by utilizing the piezoelectric shunt damping technology, and the electric energy can be dissipated through the shunt damping circuit, so that the vibration reduction effect is realized. But the piezoelectric stack is susceptible to fracture when subjected to shear forces and torque. Therefore, under the condition that the rotor system rotates at a high speed, the device has poor environmental adaptability and short service life. Moreover, the piezoelectric stack is required to be buried in the case, and the piezoelectric stack is not easy to install and process a common engineering structure.
The technical discussion of the device is referred to as: atzrodt H, Mayer D, Melz T. Reduction of bearing simulations with shock damping.16 th International Congress on Sound damping.2009: 2383-.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve prior art's problem, provide a fork type piezoelectricity and pile up damping ring, can utilize piezoelectricity reposition of redundant personnel damping technique effectively to reduce the vibration that transmission system transmitted the support through axle and bearing to can effectively avoid piezoelectricity to pile up and bear tangential stress and moment of torsion, increase the life that piezoelectricity piled up.
The utility model comprises a piezoelectric stack, a fork-shaped protective frame, an outer ring and an external shunt circuit, wherein the fork-shaped protective frame is sleeved on a bearing, the outer ring is sleeved outside the fork-shaped protective frame, and the outer ring is tightly hooped on the fork-shaped protective frame; the fork-shaped protection frame is of a symmetrical annular structure with a concave section, a plurality of piezoelectric stacks are distributed between the inner wall and the outer wall of a concave opening of the concave structure, two end faces of each piezoelectric stack are respectively adhered to the inner wall and the outer wall of the concave opening, the polarization direction of each piezoelectric stack is the same as the direction of the fork-shaped protection frame receiving bearing pressure load, when a certain position of the inner wall and the outer wall of the concave opening receives pressure to shorten the radial distance, the bending degree of the concave structure is increased, the upper end face and the lower end face of the piezoelectric ceramic are compressed, and therefore the radial force received by the vibration damping ring is converted into the pressure in the polarization direction of the piezoelectric stacks; all the piezoelectric stacks are connected in parallel and then connected with an external shunt circuit, a resistor and an inductor in series.
The utility model has the advantages that:
1. and applying vertical sinusoidal excitation on a shaft connected with the bearing, and obtaining the force transfer rate of the system under the conditions of connecting an external circuit and not connecting an external shunt circuit in a frequency domain range through MATLAB numerical simulation calculation. After the damping ring is connected with an external shunt circuit, the force transmission rate peak value of the damping ring in the direction is reduced by 60%, and the damping ring has an obvious damping effect.
2. Because the damping ring is of an annular structure and is symmetrically distributed in the radial plane of the bearing, the damping ring can also play a damping role when being excited in other radial planes.
3. The passive control technology based on the piezoelectric shunt damping technology has high robustness and quick response.
4. The device does not need a power amplifier and an external power supply similar to those in an active control system, reduces the volume and the weight, and is convenient to install and overhaul.
Drawings
FIG. 1 is a schematic diagram of a squeeze film damper configuration.
Fig. 2 is a schematic view of a piezoelectric stack damping device.
Fig. 3 is a schematic view of the damper ring installation.
Fig. 4 is a schematic diagram of a theoretical model of the system.
Fig. 5 is a diagram illustrating numerical analysis of force transmissibility.
Fig. 6 is a schematic view of a piezoelectric stack.
Fig. 7 is a schematic view of a damping ring fork type bezel.
Fig. 8 is a schematic view of a damping ring.
Figure 9 is an outer ring schematic.
Fig. 10 is a schematic diagram of a piezoelectric stack external shunt circuit.
Fig. 11 is a schematic view of the working principle of the damping ring.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
The utility model discloses install between bearing and the supporting in the rotor system, gear and axle isotructure, as shown in figure 3. Mainly for reducing the output force to the support due to vibration and thus reducing the vibration response of the overall structure. The fork-type protective frame of the vibration reduction ring can protect the piezoelectric stack from being damaged by tangential force and torque, and the service life and the stability of the piezoelectric stack are prolonged.
The structure of the utility model is as shown in fig. 8, which comprises a piezoelectric stack 1, a fork-shaped protection frame 2, an outer ring 3 and an external shunt circuit 5, wherein the fork-shaped protection frame 2 is sleeved on a bearing 4, the outer ring 3 is sleeved outside the fork-shaped protection frame 2, the outer ring 3 is tightly hooped on the fork-shaped protection frame 2, and the outer ring 3 is as shown in fig. 9; the fork-shaped protection frame 2 is shown in fig. 7 and 11, the fork-shaped protection frame 2 is a symmetrical annular structure with a concave section, a plurality of piezoelectric stacks 1 are distributed between the inner wall and the outer wall of a concave opening of the concave structure, the number of the piezoelectric stacks in the schematic diagram is 8, and a larger number of piezoelectric stacks can be mounted according to actual needs. The piezoelectric stacks are as shown in fig. 6, two end faces of each piezoelectric stack 1 are respectively adhered to the inner wall and the outer wall of the notch, the polarization direction of each piezoelectric stack 1 is the same as the direction of the pressure load of the bearing 4 received by the fork-shaped protection frame 2, when a certain position of the inner wall and the outer wall of the notch receives pressure to shorten the radial distance, the bending degree of the concave structure is increased, the upper end face and the lower end face of the piezoelectric ceramic are compressed, and therefore the radial force received by the vibration reduction ring is converted into the pressure in the polarization direction of the piezoelectric stacks; all the piezoelectric stacks 1 are connected in parallel and then connected with an external shunt circuit 5, a resistor and an inductor in series, as shown in fig. 10.
The utility model discloses install between bearing outer wall and supporting inner wall, as shown in fig. 3, fork type protecting frame plays centre gripping piezoelectricity and piles up and protect piezoelectricity to pile up the effect that does not receive destruction, as shown in fig. 11. When the rotor system vibrates, the bearings transmit the vibration force to the inner wall of the protective frame, thereby causing a radial displacement between the inner and outer walls of the protective frame. When the radial distance at a certain position of the inner wall and the outer wall is shortened, the bending degree of the concave structure is increased, and the upper end face and the lower end face of the piezoelectric ceramic are compressed, so that the radial force applied to the vibration damping ring is converted into the pressure in the piezoelectric stacking polarization direction. Through the positive piezoelectric effect, the piezoelectric stack subjected to the pressure generates electric charges on the electrodes, and the generated electric energy is dissipated through the shunt circuit. Under the working state, the piezoelectric stack in the vibration damping ring is only stressed by the pressure in the polarization direction, and the tangential direction and the torque caused by the rotation of the bearing are avoided.
The schematic diagram of the theoretical model of the system is shown in fig. 4, a sinusoidal excitation in the vertical direction is applied to a shaft connected with a bearing, the force transfer rate of the system under the condition that an external circuit is connected and an external shunt circuit is not connected in a frequency domain range is obtained through MATLAB numerical simulation calculation, and the numerical analysis schematic diagram of the force transfer rate is shown in fig. 5. After the damping ring is connected with an external shunt circuit, the force transmission rate peak value of the damping ring in the direction is reduced by 60%, and the damping ring has an obvious damping effect. Because the damping ring is of an annular structure and is symmetrically distributed in the radial plane of the bearing, the damping ring can also play a damping role when being excited in other radial planes.
The fork-type protective frame has the greatest advantages that the number of the piezoelectric stacks which can be installed is not limited too much, the number of the piezoelectric stacks can be increased or decreased according to actual needs, and fasteners such as bolts, screws and the like are not needed. The passive control technology based on the piezoelectric shunt damping technology has high robustness and quick response. The device does not need a power amplifier and an external power supply similar to those in an active control system, reduces the volume and the weight, and is convenient to install and overhaul.
The utility model discloses the mounting means as follows:
each part is processed according to the size of the bearing as shown in the schematic diagram, wherein the fork-shaped protection frame needs to be processed through 3D printing. Assembling the components, and the concrete process is as follows: two end faces of the piezoelectric stack are adhered to the annular platform of the protection frame, and the fork-shaped protection frame needs to be unfolded in the installation process so as to conveniently place the piezoelectric stack. Heating the outer ring to change its diameter, sleeving it on the fork-shaped protecting frame, cooling and tightly fastening it on the protecting frame. The piezoelectric stack is then connected to an external shunt circuit, series resistor and inductor. And the vibration damping ring is assembled and mounted on the bearing, so that the vibration damping ring can start to work.
The utility model discloses the concrete application way is many, and the above-mentioned only is the preferred embodiment of the utility model, should point out, to ordinary skilled person in this technical field, under the prerequisite that does not deviate from the utility model discloses the principle, can also make a plurality of improvements, and these improvements also should be regarded as the utility model discloses a scope of protection.
Claims (1)
1. The utility model provides a fork type piezoelectricity piles up damping ring which characterized in that: the piezoelectric actuator comprises a piezoelectric stack (1), a fork-shaped protective frame (2), an outer ring (3) and an external shunt circuit (5), wherein the fork-shaped protective frame (2) is sleeved on a bearing (4), the outer ring (3) is sleeved outside the fork-shaped protective frame (2), and the outer ring (3) is tightly hooped on the fork-shaped protective frame (2); the fork-shaped protection frame (2) is of a symmetrical annular structure with a concave section, a plurality of piezoelectric stacks (1) are distributed between the inner wall and the outer wall of a concave opening of the concave structure, two end faces of each piezoelectric stack (1) are respectively adhered to the inner wall and the outer wall of the concave opening, the polarization direction of each piezoelectric stack (1) is the same as the direction of the pressure load of the fork-shaped protection frame (2) on the bearing (4), when a certain position of the inner wall and the outer wall of the concave opening receives pressure to shorten the radial distance, the bending degree of the concave structure is increased, the upper end face and the lower end face of the piezoelectric ceramic are compressed, and therefore the radial force received by the damping ring is converted into the pressure in the polarization direction of the piezoelectric stacks; all the piezoelectric stacks (1) are connected in parallel and then are connected into an external shunt circuit (5), a resistor and an inductor in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822074281.1U CN209925503U (en) | 2018-12-11 | 2018-12-11 | Fork type piezoelectric stack vibration damping ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822074281.1U CN209925503U (en) | 2018-12-11 | 2018-12-11 | Fork type piezoelectric stack vibration damping ring |
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| Publication Number | Publication Date |
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| CN209925503U true CN209925503U (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822074281.1U Expired - Fee Related CN209925503U (en) | 2018-12-11 | 2018-12-11 | Fork type piezoelectric stack vibration damping ring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578503A (en) * | 2018-12-11 | 2019-04-05 | 南京航空航天大学 | Forked type piezo-electric stack damping ring |
-
2018
- 2018-12-11 CN CN201822074281.1U patent/CN209925503U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578503A (en) * | 2018-12-11 | 2019-04-05 | 南京航空航天大学 | Forked type piezo-electric stack damping ring |
| CN109578503B (en) * | 2018-12-11 | 2024-02-13 | 南京航空航天大学 | Fork-type piezoelectric stack vibration damping ring |
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Granted publication date: 20200110 |