阅读说明：本技术 一种旋转机械转子支承结构的压电式自平衡弹性支承干摩擦阻尼器 (Piezoelectric type self-balancing elastic support dry friction damper of rotor support structure of rotary machine ) 是由 祝长生 巩磊 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种旋转机械转子支承结构的压电式自平衡弹性支承干摩擦阻尼器,包括弹性支承、动摩擦片、动摩擦片支架、静摩擦片、力传感器、静摩擦片支架、固定板、轴向分瓣蝶形弹簧。动摩擦片安装在弹性支承动摩擦片支架上,构成动摩擦组件。静摩擦片及力传感器固定在静摩擦片支架上,构成静摩擦组件。动摩擦组件与静摩擦组件之间形成摩擦副。静摩擦片支架与固定板之间设置有带压电执行器的轴向分瓣蝶形弹簧。通过对压电执行器来改变摩擦副上的正压力,进而控制摩擦力,以实现对旋转机械转子系统振动及稳定性的主动控制。由于干摩擦阻尼器上的摩擦力可以通过压电执行器实时精确控制,因此在旋转机械转子系统的振动主动控制中有广阔的应用前景。(The invention discloses a piezoelectric type self-balancing elastic support dry friction damper of a rotor supporting structure of a rotary machine, which comprises an elastic support, a dynamic friction plate bracket, a static friction plate, a force sensor, a static friction plate bracket, a fixed plate and an axial split belleville spring. The dynamic friction plate is arranged on the elastic support dynamic friction plate bracket to form a dynamic friction assembly. The static friction plate and the force sensor are fixed on the static friction plate bracket to form a static friction assembly. And a friction pair is formed between the dynamic friction component and the static friction component. An axial split belleville spring with a piezoelectric actuator is arranged between the static friction plate bracket and the fixed plate. The positive pressure on the friction pair is changed through the piezoelectric actuator, so that the friction force is controlled, and the active control on the vibration and the stability of a rotary mechanical rotor system is realized. The friction force on the dry friction damper can be accurately controlled in real time through the piezoelectric actuator, so that the dry friction damper has a wide application prospect in the vibration active control of a rotary mechanical rotor system.)

1. A piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of a rotary machine is characterized by comprising a bearing seat, a rotating shaft, a bearing, an elastic support, a left dynamic friction plate, a right dynamic friction plate, a dynamic friction plate support, a left static friction plate, a right static friction plate, a left force sensor, a right force sensor, a left static friction plate support, a right static friction plate support, a left fixed plate, a right fixed plate, a left axial disc-shaped split spring, a right axial disc-shaped split spring, an axial pre. The left and right dynamic friction plates and the dynamic friction plate support form a dynamic friction assembly, and the left and right static friction plates, the left and right force sensors and the left and right static friction plate supports form a left static friction assembly and a right static friction assembly respectively.

2. The piezoelectric type self-balancing elastic support dry friction damper for supporting the rotor of a rotary machine according to claim 1, wherein the left and right dynamic friction plates are fixed to both sides of the dynamic friction plate holder, respectively, the left and right dynamic friction plates protrude from the dynamic friction plate holder, and the inner circumferential surface of the elastic support is connected to the rotary shaft through a bearing.

3. The piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of a rotating machine as claimed in claim 1, wherein the left and right static friction components are of a symmetrical structure, the static friction plate is fixed on the force sensor, the force sensor is fixed on the static friction plate bracket, and the static friction plate is higher than the static friction plate bracket; certain gaps are reserved between the left and right static friction plates, the outer rings of the left and right force sensors and the left and right static friction plate supports, and the left and right static friction plate supports are matched with positioning balls in the damper shell to complete radial and circumferential positioning.

4. The piezoelectric type self-balancing elastic support dry friction damper for a rotor support structure of a rotary machine according to claim 1, wherein the left and right fixing plates are installed outside the left and right static friction components and fixed on both sides of the damper housing.

5. The piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of a rotating machine as claimed in claim 1, wherein the axial pre-pressing spring is installed between the left and right static friction plate supports, the axial pre-pressing spring is positioned by positioning surfaces on the left and right static friction plate supports, or the outer ring of the axial pre-pressing spring is matched with a positioning ball in a damper shell to complete radial and circumferential positioning; the axial pre-pressing spring is connected with the positioning surfaces on the left and right static friction plate supports in a sliding manner. The axial pre-pressing spring adopts a disc spring, and can also be an annular spring, metal rubber and the like.

6. The piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of a rotary machine according to claim 1, wherein the left axial disc-shaped split spring is installed between the left static friction plate bracket and the left fixing plate, one end of the left axial disc-shaped split spring is fixed on the left fixing plate, and the other end of the left axial disc-shaped split spring is connected with the left static friction plate bracket in a sliding manner. The right axial disc-shaped split spring is arranged between the right static friction plate bracket and the right fixed plate, one end of the right axial disc-shaped split spring is fixed on the right fixed plate, and the other end of the right axial disc-shaped split spring is connected with the right static friction plate bracket in a sliding manner. Each petal of the axial disc-shaped split spring is provided with a piezoelectric actuator, and the piezoelectric actuators can be arranged on one surface of each petal only or on two surfaces of each petal.

7. The piezoelectric type self-balancing elastic support dry friction damper for the rotor support structure of the rotary machine according to claim 1, wherein the dynamic friction plate and the static friction plate can be equal-thickness rings, fan-shaped or annular structures with matrix structures, and the materials of the dynamic friction plate and the static friction plate can be combinations of steel, copper, powder metallurgy, carbon-carbon composite materials and the like.

8. The piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of a rotating machine as claimed in claim 1, wherein the left and right dynamic friction plates, the left and right static friction components, the left and right axial disc-shaped split springs and the axial pre-pressing spring are all symmetrical structures, and have the characteristic of self-balancing force, the positive pressure between the dynamic friction plates and the static friction plates can be changed by controlling the voltage on the piezoelectric actuator, so that the dry friction force is accurately controlled, and the active control of the vibration and the stability of the rotor system of the rotating machine is realized.

Technical Field

The invention relates to the field of rotary machinery, in particular to a piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of rotary machinery.

Background

With the advent of industry 4.0, the rotors of most rotating machines in modern industrial technology have been developed towards flexible structures. The working speed of the flexible rotor is generally above a first or several orders of critical speed. The traditional elastic support is widely applied to the suppression of the supercritical vibration of the flexible rotor due to the characteristics of simple structure, easiness in implementation and the like. However, in general, and particularly in the case of an elastic support using a rolling bearing, the damping that can be provided by the support for the rotor system is very small, and the requirement of the rotor system for the damping cannot be met. Therefore, additional dampers need to be added to the spring support to effectively alleviate the problems faced by a purely elastic support. Squeeze film dampers, metal rubber dampers and the like are main methods for increasing external damping, but the methods put high requirements on the accuracy and reliability of process manufacturing and structural design, otherwise, the vibration of the rotor cannot be inhibited to the maximum extent in complex actual working conditions, and complex nonlinear response can be caused by severe nonlinear characteristics, so that the vibration inhibition effect of the elastic support finally fails.

In the device structure mentioned in the patent "a method and device for suppressing vibration of rotor system with elastic support" (ZL200410073346.0), the system has complicated non-linear characteristics due to a large friction force existing when the rotor is at rest. The damping mechanism in the patent belongs to passive control rather than active control, and the magnitude of the friction force cannot be adjusted in real time according to the motion state of the rotor. In the device proposed in the patent ZL200710017593.2, friction force can be adjusted, but friction force components generated on one side are not large enough, vibration suppression effect of the damper is limited, and large axial pressure is applied to the elastic support, so that the elastic support is unstable; in particular, the friction force on the friction pair is not only related to the positive pressure but also to the friction coefficient on the friction pair. The friction coefficient is influenced by the working temperature and working conditions of the friction pair, so that the friction force cannot be accurately controlled by only controlling the positive pressure on the friction pair.

Disclosure of Invention

In order to overcome the defects of complex structure, small adjustment range of dry friction force, difficult accurate control of the dry friction force and the like of the dry friction damper in the prior art, the invention provides a piezoelectric type self-balancing elastic support dry friction damper of a rotor support structure of a rotary machine.

The technical scheme adopted by the invention is that a piezoelectric self-balancing dry friction damper with controllable dynamic characteristics is arranged on an elastic support of a rotor of a rotary machine, and a piezoelectric actuator is used for changing the friction force on a friction pair in the friction damper, so as to introduce controllable external damping for a rotor system and realize the active control of the vibration and the stability of the rotor system.

The purpose of the invention is realized by the following technical scheme: a piezoelectric type self-balancing elastic support dry friction damper of a rotor supporting structure of a rotating machine comprises a bearing seat, a rotating shaft, a bearing, an elastic support, a left dynamic friction plate, a right dynamic friction plate, a dynamic friction plate support, a left static friction plate, a right static friction plate, a left force sensor, a right force sensor, a left static friction plate support, a right static friction plate support, a left axial disc-shaped split spring, a right axial disc-shaped split spring, an axial pre-pressing spring, a fixed. The left and right dynamic friction plates and the dynamic friction plate support form a dynamic friction assembly, and the left and right static friction plates, the left and right force sensors and the left and right static friction plate supports form a left and right static friction assembly.

The left and right dynamic friction plates are respectively fixed on two sides of the dynamic friction plate support, the dynamic friction plate support can be a part of the elastic support or a part fixed at one end of the elastic support, the inner circular surface of the elastic support is connected with the rotating shaft through a bearing, and the other end of the elastic support is fixed on the bearing seat through the elastic support.

The left and right static friction components are of a symmetrical structure, the static friction plates are fixed on the force sensor, the force sensor is fixed on the inner side of the static friction plate bracket, the static friction plates are higher than the static friction plate bracket, and certain gaps are reserved between the static friction plates and the force sensor and between the static friction plate bracket and the static friction plate bracket; the static friction plate support is matched with an outer positioning ball in the damper shell to complete radial and circumferential positioning.

The axial pre-pressing spring is arranged between the two static friction plate brackets and outside the dynamic friction plate bracket; the two ends of the axial pre-pressing spring are fixed by positioning surfaces on the left and right static friction plate supports or the outer surface of the axial pre-pressing spring and a positioning ball fitting in the damper shell are used for completing radial and circumferential positioning. The axial pre-pressing spring is connected with the positioning surfaces on the left and right static friction plate supports in a sliding manner.

The left and right axial disc-shaped split springs are respectively arranged between the left and right static friction plate brackets and the left and right fixed plates, one end of each split spring is fixed on the left and right fixed plates, and the other end of each split spring is connected with the left and right static friction plate brackets in a sliding manner. Each petal of the axial disc-shaped split spring is provided with a piezoelectric actuator, the magnitude of positive pressure on a friction pair between a dynamic friction plate and a static friction plate is changed by controlling the voltage on the piezoelectric actuator, and then dry friction force is controlled, and the active control on the vibration and the stability of a rotary mechanical rotor system is realized. The piezoelectric actuators may be disposed on one or both sides of each lobe.

The left fixing plate and the right fixing plate are internally fixed with the axial disc-shaped split spring, the outer part of the left fixing plate and the outer part of the right fixing plate are connected with the damper shell through bolts, an elastic gasket is arranged between the outer part of the left fixing plate and the outer part of the damper shell in a cushioning mode, and the positions of the left fixing plate and the right fixing plate are adjusted through adjusting the pre-pressure on the bolts.

The left and right dynamic friction plates, the left and right static friction assemblies, the left and right axial disc-shaped split springs and the axial pre-pressing springs are all of symmetrical structures, the left and right static friction assemblies and the axial pre-pressing springs are circumferentially and radially limited through positioning balls with small friction damping, moving parts can flexibly move in the axial direction, the dry friction damper has a self-balancing function, positive pressures formed on the left and right friction pairs are equal in magnitude and opposite in direction, and the whole dry friction damper does not generate axial force on the elastic support.

The main working modes of the invention are as follows: when the vibration and the stability of the rotor system need to be actively controlled by changing the damping of the elastic support, firstly, the voltage which needs to be applied to the piezoelectric actuators on the axial disc-shaped split springs on the left side and the right side is determined according to the magnitude of the required dry friction force, under the action of the control voltage, the axial disc-shaped split springs on the left side and the right side generate axial acting force on left and right static friction plate supports, the left and right static friction assemblies approach to the dynamic friction assembly, positive pressure is generated on two friction pairs, and then the dry friction force is formed, so that the vibration and the stability of the rotary mechanical rotor system are controlled. The dry friction force on the friction pair can be controlled in real time through the voltage on the piezoelectric actuator, so that the vibration and the stability of the rotor system can be actively controlled.

One mode is that under the condition that the piezoelectric actuator does not work, the axial disc-shaped split springs and the axial pre-pressing springs on the left side and the right side are in a pressed state by adjusting the positions of the left fixing plate and the right fixing plate, but no obvious positive pressure is generated on the friction pair, and then the piezoelectric actuator on the axial disc-shaped split springs on the left side and the right side applies positive pressure to the friction pair to generate the required dry friction force. The other is that under the state that the piezoelectric actuator does not work, the positions of the left and right fixed plates are adjusted to ensure that the axial disc-shaped split springs and the axial pre-pressing springs on the left and right sides are in a pressed state, a certain positive pressure is generated on the friction pair, and then the magnitude of the positive pressure on the friction pair is changed through the piezoelectric actuators on the axial disc-shaped split springs on the left and right sides, so that the dry friction force is controlled.

Compared with the prior art, the invention has the advantages that 1) the moving parts are all supported by rolling, the structure is simple, the axial movement is flexible, the response speed is high, and the requirements of vibration and stability active control of a high-speed rotating mechanical rotor system can be met; 2) the voltage on the piezoelectric actuator is adjusted on line, so that the friction force is directly and accurately controlled, the influence of friction coefficient change caused by the change of temperature, working state and the like on the friction surface on the friction force control precision in the friction force control process by controlling the positive pressure on the friction pair is avoided, and the control precision is improved; 3) the control range of the damping force of the dry friction damper is large, and the axial size of the structure is small; 4) the self-balancing function is realized, and no additional axial force is generated on the elastic support.

Drawings

FIG. 1 is a schematic structural diagram of a piezoelectric self-balancing elastic support dry friction damper of a rotor support structure of a rotary machine with axial pre-compression springs and belleville springs;

FIG. 2 is a cross-sectional view of a piezoelectric self-balancing elastic support dry friction damper of a rotor support structure of a rotary machine with axially pre-compressed springs using belleville springs;

FIG. 3 is a schematic diagram of the arrangement of axial belleville spring structures and piezoelectric actuators;

in the figure: 1. a rotating shaft; 2. an elastic support; 3. an elastic support bracket; 4. a bearing seat; 5. a bearing; 6. a dynamic friction plate bracket; 7A, a right dynamic friction plate; 7B, a left dynamic friction plate; 8A, a right static friction plate; 8B, a left static friction plate; 9a, a right force sensor; 9B, a left force sensor; 10A, a right axial disc-shaped split spring; 10B, a left axial disc-shaped split spring; 11A, a right static friction plate bracket; 11B, a left static friction plate bracket; 12. axially pre-pressing the spring; 13A, a right fixing plate; 13B, a left fixing plate; 14. a positioning ball; 15. a damper housing.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1, the piezoelectric self-balancing elastic support dry friction damper of a rotor support structure of a rotary machine provided by the invention comprises a rotating shaft 1; an elastic support 2; an elastic support bracket 3; a bearing seat 4; a bearing 5; a dynamic friction plate bracket 6; a right dynamic friction plate 7A; a left movable friction plate 7B; a right static friction plate 8A; a left static friction plate 8B; a right force sensor 9A; a left force sensor 9B; right axially precompressed disc-shaped split spring A10A; the disc-shaped split spring 10B is axially pre-pressed at the left side; a right friction plate holder 11A; a left friction plate holder 11B; an axial preload spring 12; a right fixing plate 13A; a left fixing plate 13B; a right positioning ball 14; a damper housing 15. Wherein:

the dynamic friction plate bracket 6, the right dynamic friction plate 7A and the left dynamic friction plate 7B form a dynamic friction assembly of the dry friction damper; the right static friction plate 8A, the right force sensor 9A, the right static friction plate bracket 11A and the right axial disc-shaped split spring 10A form a right static friction assembly of the dry friction damper; the left static friction plate 8B, the left force sensor 9B, the left static friction plate support 11B and the left axially pre-pressed disc-shaped split spring 11B form a left static friction assembly of the dry friction damper.

The right dynamic friction plate 7A, the left dynamic friction plate 7B, the right static friction plate 8A and the left static friction plate 8B are all annular, and the outer diameter of the dynamic friction plates is slightly smaller than that of the static friction plates; the inner diameter of the dynamic friction plate is slightly larger than that of the static friction plate.

The movable friction plate support 6 is fixed at one end of the elastic support 2, the right movable friction plate 7A and the left movable friction plate 7B are respectively fixed at two sides of the movable friction plate support 6, the left movable friction plate 7A and the right movable friction plate 7B are both higher than the movable friction plate support 6, the inner surface of one end of the elastic support 2 is connected with the rotating shaft 1 through a bearing 5, and the whole elastic support structure is fixed on the bearing seat 4 through the elastic support 3 at the left side.

The right static friction plate 8A and the left static friction plate 8B are fixed on the right force sensor 9A and the left force sensor 9B, then the right force sensor 9A and the left force sensor 9B are respectively fixed on the right static friction plate support 11A and the left static friction plate support 11B, and a certain gap is reserved between the right static friction plate support 11A and the left static friction plate support 11B by the right static friction plate 8A, the left static friction plate 8B, the right force sensor 9A and the left force sensor 9B respectively. The right static friction plate 8A and the left static friction plate 8B are higher than the static friction plate bracket. The outer surfaces of the left and right static friction plate brackets 11A and 11B are matched with the positioning balls 14 in the damper shell 15 in a gapless or micro-clearance mode, so that radial and circumferential positioning is completed, but flexible movement in the axial direction can be realized.

The right dynamic friction plate 7A, the left dynamic friction plate 7B, the right static friction plate 8A and the left static friction plate 8B can be equal-thickness circular rings or fan-shaped or annular structures with base body structures, and the dynamic and static friction plates can be made of steel, copper, powder metallurgy, carbon-carbon composite materials and the like.

The axial pre-pressing spring 12 is of a symmetrical structure and is positioned between the left and right static friction plate brackets 11A and 11B; the axial pre-pressing spring 12 can be positioned by using the left and right static friction plate brackets 11A and 11B, and can also be matched with the positioning ball 14 in the damper shell 15 by adopting gapless or micro-clearance fit through the outer surface of the axial pre-pressing spring 12 to complete radial and circumferential positioning, but can flexibly move in the axial direction. The axial pre-pressing spring 12 is connected with the left and right static friction plate brackets 11A and 11B in a sliding mode.

Each of the left and right axial disc- shaped split springs 10A and 10B is provided with a piezoelectric actuator, which can be arranged on one side or two sides of each split, and the voltage on the piezoelectric actuator can be controlled to control the axial force of the axial disc- shaped split springs 10A and 10B on the static friction component, change the axial positive pressure on the two friction pairs and control the magnitude of the friction force, thereby realizing the active control of the vibration and the stability of the rotor system by adding necessary damping to the rotor system through the elastic support.

Axial disc- shaped split springs 10A and 10B are fixed inside the left fixing plate 13A and the right fixing plate 13B, the left fixing plate 13A and the right fixing plate 13B are connected with a damper shell 15 through bolts, an elastic gasket is arranged between the left fixing plate 13A and the right fixing plate 13B and the damper shell 15 in a cushioning mode, and the states of the axial pre-pressing spring 12 and the axial disc- shaped split springs 10A and 10B and the contact force between friction pairs are changed through adjusting the positions of the left fixing plate 13A and the right fixing plate 13B.

As shown in fig. 2, in order to improve the positioning accuracy of the left and right static friction components in the circumferential direction and the radial direction and the flexibility of movement in the axial direction, a plurality of rolling pairs composed of a plurality of positioning balls 14 are arranged between the left and right static friction plate supports 11A and 11B and the dry friction damper housing 15, the number of the rolling pairs is at least not less than 3, the rolling pairs are arranged in the rolling paths of the positioning balls 14 of the dry friction damper housing 15, the surfaces of the positioning balls are exposed out of the inner surface of the housing for a certain height, and the balls are ensured not to fall off.

In order to improve the flexibility of the axial movement of the left and right static friction components, the raceway of the positioning ball 14 may be filled with a lubricating material corresponding to the working conditions, the lubricating material at low temperature may be common lubricating ester, and the lubricating material at high temperature may be graphite, solid lubricating powder, etc.

In order to improve the control accuracy, axial force and shear force sensors 9A and 9B are provided between the left and right static friction plates 8A and 8B and the left and right static friction plate holders 11A and 11B, and the positive pressure on the friction pair between the dynamic friction plates 7A and 7B and the static friction plates 8A and 8B and the generated dry friction force are accurately measured. In order to reduce the influence of the friction coefficient change caused by the working temperature and the working condition of the friction pair on the control precision of the friction force and improve the control precision, a closed-loop control system related to the voltage on the piezoelectric actuator can be formed by taking the required friction force as a target, so that the friction force can be accurately controlled.

The left and right fixing plates 13A and 13B are connected with the damper shell 15 through bolts, and spring gaskets are padded between the left and right fixing plates 13A and 13B and the damper shell 15.

When vibration and stability of the rotor system need to be controlled through external damping on the elastic support, firstly, the voltage of a piezoelectric actuator on the axial butterfly spring is determined according to the dry friction force, under the action of control voltage, the axial butterfly split spring generates axial force, the two static friction assemblies approach to the corresponding dynamic friction plates 7A and 7B, axial positive pressure is generated on friction pairs between the dynamic friction plates 7A and 7B and the static friction plates 8A and 8B, and then dry friction force is generated, and necessary damping is provided for the rotor system. The dry friction force on the friction pair can be controlled in real time through the voltage on the piezoelectric actuator, so that the active control on the vibration and the stability of the rotor system can be realized.

During assembly:

firstly, a piezoelectric actuator is arranged on each valve of an axial disc-shaped split spring according to the requirement of structural position, and is connected with a leading-out wire of the piezoelectric actuator in parallel.

Then, the dynamic friction assembly is installed according to the requirement of the structure position, and for the structure of the dynamic friction plate bracket 6 integrated with the elastic support, firstly, a right dynamic friction plate 7A and a left dynamic friction plate 7B are respectively fixed on two sides of the dynamic friction plate bracket 6, the outer surfaces of the two dynamic friction plates are kept parallel, and the dynamic friction plates 7A and 7B are protruded out of the dynamic friction plate bracket 6 after installation. For the structure of the movable friction plate bracket 6 which is separated from the elastic support, the movable friction plate bracket 6 is firstly fastened at one end of the elastic support, then a right movable friction plate 7A and a left movable friction plate 7B are respectively fixed at two sides of the movable friction plate bracket 6, the outer surfaces of the two movable friction plates are kept parallel, and the movable friction plates 7A and 7B are protruded out of the movable friction plate bracket 6 after installation.

Furthermore, according to the structural position requirements, left and right static friction plates 8A and 8B are respectively fixed on left and right force sensors 9A and 9B, then the force sensors 9A and 9B are fixed on static friction plate supports 11A and 11B, and after installation, the static friction plates 8A and 8B protrude out of the static friction plate supports 11A and 11B to form left and right static and dynamic friction assemblies.

Furthermore, the positioning balls 14 and the lubricating material are installed in the damper housing 15 according to the structural position requirements, and are simply fixed at the ends.

Further, the left and right axial disc-shaped split springs 10B and 10A are installed in the left and right fixing plates 13B and 13A according to the structural position requirements, and the lead wires are fixed.

Further, the dry friction damper is assembled according to the structural position requirement, the left static friction component can be firstly installed on the left side of the damper shell 15 according to the requirement, and the fixing plate 13B with the axial disc-shaped split spring 10B is installed and fixed on the damper shell 15; then installing a dynamic friction assembly and an axial pre-pressing spring 12; the right static friction pack and right fixed plate 13A with right axial disc split spring 10A are then installed and fixed to the damper housing 15.

Further, the assembled dry friction damper is debugged, and the left and right axially preloaded disc-shaped split springs 10A and 10B and the axially preloaded spring 12 are in a compressed state by adjusting the pretightening force of the bolts between the left and right fixing plates 13A and 13B and the damper housing 15, and a zero-pressure contact state or a required positive-pressure contact state on the friction pair is realized.

Finally, the left end of the elastic support 2 is fixed on the elastic support bracket 3 by bolts, the elastic support 3 is fixed on the left end of the bearing seat 4 by screws, the inner surface of the right end of the elastic support 2 is connected with the rotating shaft 1 by a bearing 5, and the outer side of the inner ring of the bearing is fixed by nuts or other methods. The housing 15 of the entire dry friction damper is fixed to the bearing block 4, completing the assembly of the entire dry friction damper.

When vibration and stability of the rotor system are required to be controlled through external damping on the elastic support, firstly, the voltage required on a piezoelectric actuator on the axial disc-shaped split spring is determined according to the required dry friction force, so that positive pressure generated on friction pairs of the dynamic friction plates 7A and 7B and the static friction plates 8A and 8B is adjusted, the dry friction force is controlled, and necessary damping is provided for the rotor system. The dry friction force between the dynamic friction plate and the static friction plate can be controlled in real time through the control voltage on the piezoelectric actuator, so that the piezoelectric actuator has the advantages of fast frequency response, wide axial force change range and the like, and can actively control the vibration and the stability of the rotor system.

The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.