A support device for active control of shaft vibration

Abstract

This invention provides a support device for active control of shaft vibration, relating to the field of rotor system vibration reduction. It features a compact structure, good stability, strong anti-interference capability, high vibration control precision, and excellent vibration suppression effect. It effectively suppresses both small vibrations and transcritical large vibrations of the shaft system, with a particularly significant suppression effect under transcritical large vibration conditions. The technical solution of this invention includes a flexible support component, an active control component, a friction component, a rigid support component, and a bearing. This invention overcomes the limitations of passive control vibration reduction methods in terms of vibration control precision and suppression effect through active control. This device effectively suppresses both small vibrations and transcritical large vibrations of the shaft system, with a more significant suppression effect under transcritical large vibration conditions.

Description

Technical Field

[0001] This invention relates to the field of rotor system vibration reduction, and more particularly to the field of multi-support shaft system vibration suppression. Background Technology

[0002] Multi-point shaft systems are widely used in equipment such as helicopters, ships, and steam turbine units. To meet the design requirements of high speed, low energy consumption, and flexibility, multi-point shaft systems generally adopt supercritical design, with operating speeds higher than the first-order critical speed. However, during the accelerated transcritical process, the bending vibration of the multi-point shaft system increases dramatically, leading to noise pollution, shortened component lifespan, and even failure, potentially causing significant economic losses. Furthermore, reducing the bending vibration of the multi-point shaft system can improve the working performance of mechanical equipment and extend the service life of components. Therefore, it is necessary to suppress the bending vibration of multi-point shaft systems under transcritical conditions. As a typical rotor system, the vibration reduction methods for multi-point shaft systems are mainly divided into active control vibration reduction methods and passive control vibration reduction methods. Among them, active vibration reduction methods have the characteristics of strong anti-interference, applicability, and high control precision, and have a promising application prospect in the field of rotor system vibration reduction.

[0003] In the field of rotor system vibration reduction, the suppression of transcritical large vibrations is particularly important. In the January 2000 issue of the Journal of Aerospace Power, Volume 15, No. 1, a smart variable stiffness support system for active control of high-speed rotor vibration was disclosed. The dynamic response curves of the rotor system under two different support stiffnesses were recorded. It was concluded that the key to successfully implementing the active variable stiffness theory is to solve the following technical problems: (1) When selecting the support stiffness, the initial stiffness should be appropriately greater than the changed stiffness so that the maximum amplitude is smaller; (2) The change between support stiffnesses must be fast. The shorter the change interval, the better the active control effect of the system; (3) The support system should have a certain damping to limit the maximum amplitude response of the system. Based on this, the paper proposed a smart variable stiffness support system, which changes the support stiffness by changing the axial position of the vertical pin. However, such a structure is actually too complex and too expensive, making it difficult to apply in practice. It only provides a theoretical possibility for variable stiffness support.

[0004] Therefore, how to improve the rotor's support device to enable it to respond quickly, reduce stiffness, and provide damping under large vibrations, especially transcritical large vibrations, and to have good practical application prospects, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the above problems, this invention proposes a support device for active control of shaft vibration. It has a compact structure, good stability, strong anti-interference ability, high vibration control accuracy, and good vibration suppression effect. It can effectively suppress both small vibrations and transcritical large vibration states of the shaft system, and the suppression effect is more obvious in the transcritical large vibration state.

[0006] The technical solution of the present invention includes a flexible support component 11, an active control component 12, a friction component 13, a rigid support component 14, and a bearing 15.

[0007] The flexible support assembly 11 includes a hollow base support 112, a sleeve 113 is installed in the base support 112, and the bearing 15 is installed in the sleeve 113.

[0008] A plurality of blind holes are evenly provided along the circumference of the base support 112. The active control component 12 includes a plurality of piezoelectric ceramics 121 disposed in the blind holes. A push rod 122 as an output is connected to the side of the piezoelectric ceramics 121 facing the opening of the blind hole.

[0009] The friction assembly 13 and the rigid support assembly 14 correspond one-to-one with the piezoelectric ceramic 121;

[0010] The friction assembly 13 includes an auxiliary friction plate 131, a through-hole friction plate 132, and a sleeve friction plate 133. The sleeve friction plate 133 is loosely fitted onto the push rod 122, and a plurality of sleeve friction plates 133 are fixedly connected to the sleeve 113 along the radial direction of the sleeve 113. The through-hole friction plate 132 abuts against the piezoelectric ceramic 121 and the sleeve friction plate 133. The auxiliary friction plate 131 is pressed against the surface of the sleeve friction plate 133 by a rigid support assembly 14 and blocks the push rod 122.

[0011] The rigid support assembly 14 includes a baffle 141, a bolt 142, a disc spring 144, and a nut 145. The baffle 141 is pressed onto one side end face of the base support 112 and presses against the sleeve friction plate 133. The auxiliary friction plate 131 is fixedly installed in the friction plate mounting groove inside the baffle 141 and also presses against the surface of the sleeve friction plate 133.

[0012] The bolt 142 passes through the baffle 141 and the foundation support 112 in sequence and is threadedly connected to the nut 145. The disc spring 144 is fitted on the bolt 142 and abuts between the bolt head of the baffle 141 and the bolt 142, so that when there is no external force, the baffle 141 and the auxiliary friction plate 131 press against the sleeve friction plate 133 and provide preload through the disc spring 144.

[0013] In this way, when there is no external force, that is, when the piezoelectric ceramic is de-energized, the disc spring 144 provides a pre-pressure so that the baffle 141 presses against the sleeve friction plate 133. The sleeve friction plate is approximately rigidly connected to the baffle and the baffle to the foundation support, which has a large rigidity and a good resistance to small vibrations transmitted from the bearing.

[0014] When an external detection mechanism detects increased vibration, especially under transcritical large vibration conditions, it will actively intervene, controlling the piezoelectric ceramic to energize and drive the push rod 122 to push outward slightly the auxiliary friction plate 131 and the baffle 141, causing the baffle 141 to "disconnect" from the sleeve friction plate 133. This allows sliding friction to occur between the sleeve friction plate 133, the through-hole friction plate 132, and the auxiliary friction plate 131, so that the vibration energy transmitted from the bearing through the sleeve will be transmitted to each sleeve friction plate 133 and consumed through the sliding friction between the sleeve friction plate 133, the through-hole friction plate 132, and the auxiliary friction plate 131, thereby reducing stiffness and providing damping.

[0015] Furthermore, a rubber ring 111 is provided between the base support 112 and the sleeve 113. This provides flexible support for the sleeve, and the sleeve 113, the rubber ring 111, and the base support 112 constitute a flexible support assembly 11 that provides flexible support for the bearing 15.

[0016] Furthermore, the through-hole friction plate 132 is cylindrical and is fitted onto the push rod 122.

[0017] Furthermore, the sleeve friction plate 133 is provided with a push rod receiving hole arranged radially along the sleeve 113. The push rod 122 passes through the push rod receiving hole, and the outer diameter of the push rod is smaller than the diameter of the push rod receiving hole, thus realizing the above-mentioned empty sleeve connection relationship, so that the sleeve friction plate 133 can be forced to generate relative movement with the push rod 122 under the drive of the sleeve 113.

[0018] Furthermore, two bolts are symmetrically arranged on the baffle plate. One bolt passes through the baffle plate 141 and the base support 112 and is threaded to a nut. The other bolt passes through the baffle plate 141, the sleeve friction plate 133, and the base support 112 in sequence and is threaded to another nut. This makes the connection of the baffle plate and the pressing of the sleeve friction plate more stable.

[0019] The invention exhibits a more pronounced suppression effect under transcritical large vibration conditions, and its working principle includes the following:

[0020] Under normal conditions, the piezoelectric ceramic is not energized. At this time, the rigid support component is in action. The bolts and nuts press the baffle, the foundation support and the friction component above the support device together. The vibration energy of the shaft passes through the bearing, the sleeve friction plate, the baffle and the foundation support in sequence, and finally to the fixed platform. In this state, the support device is a rigid support, which has a significant effect on suppressing small vibrations.

[0021] In operation, when the piezoelectric ceramic is energized, the actuating end of the piezoelectric ceramic in the active control component extends, pushing the push rod forward. The push rod generates a forward thrust on the auxiliary friction plate. Since a disc spring is placed between the baffle and the bolt, as long as the thrust of the push rod on the auxiliary friction plate is greater than the preload of the bolt, the push rod can push the auxiliary friction plate and the baffle forward together. At this time, sliding friction can be generated between the sleeve friction plate, the through-hole friction plate, and the auxiliary friction plate. The vibration energy of the shaft is transmitted from the bearing to the sleeve friction plate in sequence, and is consumed by the sliding friction between the sleeve friction plate, the through-hole friction plate, and the auxiliary friction plate. In this state, the support device generates frictional damping through sliding friction, which has a significant effect on suppressing transcritical vibration of the shaft system.

[0022] The beneficial effect of this invention is that it makes up for the shortcomings of the passive control vibration reduction method in terms of vibration control accuracy and vibration suppression effect by actively controlling the vibration. This device can effectively suppress both small vibrations and transcritical large vibration states of the shaft system, and the suppression effect is more obvious in the transcritical large vibration state. Attached Figure Description

[0023] Figure 1 This is a 3D view of the case;

[0024] Figure 2 This is a vertical cross-sectional view of the case along the axis;

[0025] Figure 3 This is a schematic diagram illustrating the implementation method of this case;

[0026] In the figure, 1 is a support device for active control of shaft vibration, 11 is a flexible support assembly, 12 is an active control assembly, 13 is a friction assembly, 14 is a rigid support assembly, and 15 is a bearing.

[0027] 111 is a rubber ring, 112 is a foundation support, 113 is a sleeve; 121 is a piezoelectric ceramic, 122 is a push rod, 131 is an auxiliary friction plate, 132 is a through-hole friction plate, 133 is a sleeve friction plate, 141 is a baffle, 142 is a bolt, 143 is a screw, 144 is a disc spring, and 145 is a nut.

[0028] 2 is the axis, and 3 is the fixed platform. Detailed Implementation

[0029] To clearly illustrate the technical features of this patent, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0030] The present invention is as follows Figure 1-3 As shown below, the vibration state of the shaft can be detected by means of commonly used displacement sensors, acceleration sensors and other instruments in the prior art. At the same time, the driving of piezoelectric ceramics is also a conventional technical means in the prior art. Therefore, this application will not elaborate on these two aspects.

[0031] like Figure 1 , 2 As shown, the support device 1 for active control of shaft vibration provided in this embodiment includes a flexible support assembly 11, an active control assembly 12, a friction assembly 13, and a rigid support assembly 14;

[0032] The flexible support component 11 includes a rubber ring 111, a base support 112, and a sleeve 113;

[0033] The active control component 12 includes a piezoelectric ceramic 121 and a push rod 122;

[0034] Friction assembly 13 includes auxiliary friction plate 131, through-hole friction plate 132, and sleeve friction plate 133;

[0035] The rigid support assembly 14 includes a baffle 141, a bolt 142, a screw 143, a disc spring 144, and a nut 145.

[0036] The bottom of the foundation support 112 is fixedly connected to the fixed platform 3 and placed perpendicular to the axis of the shaft 2. The foundation support 112 has a stepped hole in the middle for placing the rubber ring 111.

[0037] The foundation support 112 has several blind holes and through holes in its circumference. The piezoelectric ceramic 121 is placed in the blind holes, and the bolt 142 is placed in the through holes. The piezoelectric ceramic 121 is placed inside the foundation support 112, parallel to the shaft 2. The push rod 122 is placed on one side of the piezoelectric ceramic 121 in the axial direction, parallel to the shaft 2. The bottom surface of the foundation support 112 has through holes on the left and right sides for installing screws or bolts that are connected to the fixed platform.

[0038] The sleeve 113 is installed in the through hole in the middle of the rubber ring 111. The sleeve 113 is close to the inner ring surface of the rubber ring 111, and the outer end face of the sleeve 113 is close to the end face of the rubber ring 111. The through hole friction plate 132 and the auxiliary friction plate 131 are respectively placed on both sides of the sleeve friction plate 133, parallel to the shaft 2.

[0039] The sleeve 113 has a through hole in the center to accommodate the shaft 2. The diameter of the through hole is larger than the outer diameter of the shaft 2. The sleeve 113 and the shaft contact part are connected by a bearing 15.

[0040] The baffle 141 is connected to the base support 112 by bolts 142 and nuts 145. The disc spring 144 is placed between the bolts 142 and the baffle 141. There can be one or more disc springs in the same installation position. When there are multiple disc springs, they can be used in parallel or in series. The screw 143 is placed in the through hole in the middle of the baffle 141 to connect the auxiliary friction plate 131 and the baffle 141.

[0041] The end face of the actuating end of the piezoelectric ceramic 121 coincides with a certain bottom surface of the push rod 122, and the axis of the piezoelectric ceramic 121 coincides with that of the push rod 122. The actuation type of the piezoelectric ceramic can be either one end extension or both ends extension.

[0042] The sleeve friction plate 133 can be rectangular, trapezoidal or other geometric shapes;

[0043] The sleeve friction plate 133 has several through holes for placing the push rod 122 and the bolt 142. The diameter of the through holes is larger than the diameter of the push rod 122 and the bolt 142. The diameter of the through holes needs to ensure that the sleeve friction plate 133 will not collide with the push rod 122 and the bolt 142 when the shaft 2 vibrates in the working state of the support device 1.

[0044] The through-hole friction plate 132 has a through hole in the center. The diameter of the through hole is larger than the outer diameter of the actuating end of the piezoelectric ceramic 121 and also larger than the diameter of the push rod 122. The through-hole friction plate 132 is placed with the axis of the piezoelectric ceramic 121 coincidentally. The bottom surface of the through-hole friction plate 132 coincides with the annular surface of the actuating end of the piezoelectric ceramic 121. The top surface of the through-hole friction plate 132 is in contact with one side surface of the sleeve friction plate 133.

[0045] The auxiliary friction plate 131 is placed with the push rod 122 axially aligned. The top surface of the auxiliary friction plate 131 coincides with the top surface of the push rod 122 and the other side surface of the sleeve friction plate 133. A blind hole is opened in the center of the bottom surface of the auxiliary friction plate 131 for installing the screw 143 connected to the baffle 141.

[0046] The baffle 141 has several through holes for installing bolts 142 and screws 143. The back of the baffle 141 is an irregular stepped surface and is in contact with the bottom surface of the auxiliary friction plate 131, the other side surface of the sleeve friction plate 133, and the front of the foundation support 112.

[0047] The front of the disc spring 144 contacts the bolt 142, and its back contacts the baffle 141, with the disc spring 144 and the bolt 141 coinciding on the axis.

[0048] The base support 112 has a through hole at the center of the bottom of the blind hole used to place the piezoelectric ceramic 121, which is used to place the voltage input line of the piezoelectric ceramic 121.

[0049] The diameter of the blind hole in the base support 112 used to place the piezoelectric ceramic 121 must be greater than the outer diameter of the piezoelectric ceramic 121 and equal to the outer diameter of the through hole friction plate 132, so as to ensure that the through hole friction plate 132 does not move in the vertical direction and thus the piezoelectric ceramic is subjected to shear force.

[0050] The bolts 142 and nuts 145 used to connect the baffle 141 and the foundation support 112 are axially aligned, and one end face of the nut 145 is in close contact with the back of the foundation support 112.

[0051] The active control component 12, the auxiliary friction plate 131 and the through-hole friction plate 132 in the friction component 13, and the rigid support component 14 are all circumferentially and evenly arranged on the same circumference with the center of the bearing 15 as the center. The number of each component distributed around the circumference can be two or more, which can ensure the overall structural stability of the support device 1.

[0052] The rigid support assembly 14 works when the piezoelectric ceramic 121 is not energized. Bolts 142 and nuts 145 press the baffle 141, the base support 112 and the friction assembly 13 together. The vibration energy of the shaft 2 passes through the bearing 15, the sleeve friction plate 133, the baffle 141 and the base support 112 in sequence, and is finally transmitted to the fixed platform 3.

[0053] When the piezoelectric ceramic 121 in the active control component 12 is energized, the actuating end of the piezoelectric ceramic 121 extends, pushing the push rod 122 to move in the extension direction. The push rod 122 generates a thrust in the extension direction on the auxiliary friction plate 131. Since a disc spring 144 is placed between the baffle 141 and the bolt 142, as long as the thrust of the push rod 122 on the auxiliary friction plate 131 is greater than the preload of the bolt 142, the push rod 122 can push the auxiliary friction plate 131 and the baffle 141 to move together. At this time, sliding friction can be generated between the sleeve friction plate 133, the through hole friction plate 132, and the auxiliary friction plate 131. The vibration energy of the shaft 2 is transmitted to the sleeve friction plate 133 by the bearing 15 in sequence, and is consumed by the sliding friction between the sleeve friction plate 133, the through hole friction plate 132, and the auxiliary friction plate 131.

[0054] The support device 1 used for active control of shaft vibration can be arranged on the shaft 2, one, two or more, and must ensure that the vibration suppression effect on the shaft 2 is obvious.

[0055] The device of this invention overcomes the shortcomings of passive control vibration reduction methods in terms of vibration control accuracy and vibration suppression effect by actively controlling the device. The device can effectively suppress both small vibrations and transcritical large vibration states of the shaft system, and the suppression effect is more obvious in the transcritical large vibration state.

[0056] There are many specific ways to implement this invention. The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A support device (1) for active control of shaft vibration, characterized in that, It includes a flexible support assembly (11), an active control assembly (12), a friction assembly (13), a rigid support assembly (14), and a bearing (15). The flexible support assembly (11) includes a hollow base support (112), in which a sleeve (113) is installed, and the bearing (15) is installed in the sleeve; A plurality of blind holes are evenly provided along the circumference of the base support (112). The active control component (12) includes a plurality of piezoelectric ceramics (121) disposed in the blind holes. The piezoelectric ceramics (121) are connected to a push rod (122) as an output on the side facing the opening of the blind hole. The friction assembly (13) and the rigid support assembly (14) correspond one-to-one with the piezoelectric ceramic (121); The friction assembly (13) includes an auxiliary friction plate (131), a through-hole friction plate (132), and a sleeve friction plate (133). The sleeve friction plate (133) is loosely fitted onto the push rod (122), and several sleeve friction plates (133) are fixedly connected to the sleeve (113) along the radial direction of the sleeve (113). The through-hole friction plate (132) abuts against the piezoelectric ceramic (121) and the sleeve friction plate (133). The auxiliary friction plate (131) is pressed against the surface of the sleeve friction plate (133) by a rigid support assembly (14) and blocks the push rod (122). The rigid support assembly (14) includes a baffle (141), a bolt (142), a disc spring (144), and a nut (145). The baffle (141) is pressed onto one side end face of the base support (112) and presses against the sleeve friction plate (133). The auxiliary friction plate (131) is fixedly installed in the friction plate mounting groove inside the baffle (141) and also presses against the surface of the sleeve friction plate (133). The bolt (142) passes through the baffle (141) and the foundation support (112) in sequence and is then threadedly connected to the nut (145). The disc spring (144) is fitted on the bolt (142) and abuts against the bolt head of the baffle (141) and the bolt (142), so that when there is no external force, the baffle (141) and the auxiliary friction plate (131) press against the sleeve friction plate (133) and provide preload through the disc spring (144). Two bolts are symmetrically arranged on the baffle. One bolt passes through the baffle (141) and the base support (112) and is then threaded to a nut. The other bolt passes through the baffle (141), the sleeve friction plate (133), and the base support (112) in sequence and is then threaded to another nut. Under normal conditions, the piezoelectric ceramic is not energized. The bolts and nuts press the baffle, foundation support and friction components above the support device together. The vibration energy of the shaft passes through the bearing, sleeve friction plate, baffle and foundation support in sequence, and is finally transmitted to the fixed platform. The support device is a rigid support. In operation, the piezoelectric ceramic is energized, which pushes the push rod forward. The push rod pushes the auxiliary friction plate and the baffle forward together. At this time, sliding friction can be generated between the sleeve friction plate, the through hole friction plate, and the auxiliary friction plate. The vibration energy of the shaft is transmitted from the bearing to the sleeve friction plate in sequence, and is consumed by the sliding friction between the sleeve friction plate, the through hole friction plate, and the auxiliary friction plate.

2. The support device (1) for active control of shaft vibration according to claim 1, characterized in that, A rubber ring (111) is provided between the foundation support (112) and the sleeve (113).

3. The support device (1) for active control of shaft vibration according to claim 1, characterized in that, The through-hole friction plate (132) is cylindrical and is fitted onto the push rod (122).

4. The support device (1) for active control of shaft vibration according to claim 1, characterized in that, The sleeve friction plate (133) has a push rod receiving hole arranged radially along the sleeve (113), the push rod (122) passes through the push rod receiving hole, and the outer diameter of the push rod is smaller than the diameter of the push rod receiving hole.

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