CN220352599U - Electromagnetic inertial damper capable of achieving bidirectional vibration reduction - Google Patents

Abstract

The utility model discloses a bidirectional vibration reduction electromagnetic inertial damper, which relates to the technical field of vibration control and comprises two damper units and a connecting mechanism for fixing, wherein the damper units comprise a ball screw transmission mechanism, a flywheel damping mechanism and a universal coupling, the ball screw transmission mechanism is used for being connected with a vibration reduction piece, the ball screw transmission mechanism and the flywheel damping mechanism are both connected with the connecting mechanism, and the ball screw transmission mechanism and the axis of the flywheel damping mechanism are in a set angle and are in transmission connection through the universal coupling. The two damper units are connected, so that the problems of in-plane vibration reduction and out-of-plane vibration reduction of the bridge stay cable can be solved; the ball screw transmission mechanism and the flywheel damping mechanism of each damper unit are connected in an angle through the connecting mechanism, so that the problem of limited space arrangement on a bridge is solved.

Description

Electromagnetic inertial damper capable of achieving bidirectional vibration reduction

Technical Field

The utility model relates to the technical field of vibration control, in particular to a bidirectional vibration reduction electromagnetic inertial damper.

Background

As cable-stayed bridges become larger in span, the length of the individual stay cables becomes longer and longer. The main span 1176m of the Changjiang river bridge with the length of up to 633m, the stay cable has low natural frequency and small damping, and is easy to vibrate greatly under the actions of wind, traffic load and the like. Excessive vibration can cause fatigue damage and accelerated stress corrosion, and the service life of the stay cable is seriously reduced. At present, the main engineering measure is to install an external damper near the anchoring end of the stay cable, so as to improve the modal damping ratio of the stay cable, thereby achieving the purpose of inhibiting the excessive vibration of the stay cable. The linear viscous damper is used as one of passive control modes in the external damper, is convenient to install and overhaul, low in cost and free from energy supply, and is most widely used in theoretical research and application in the field of stay cable vibration reduction. Previous studies have shown that the maximum modal damping ratio of a linear viscous damper is proportional to the mounting position ratio a/L (a is the mounting height of the stay cable; L is the length of the stay cable), and the theoretical value is a/2L. Because the mounting height of the damper is limited and the value of a is limited, when L is large, the value of the mounting position ratio a/L is drastically reduced, so that the modal damping ratio provided by the conventional damper on the ultra-long stay cable is smaller. For example, in a cable-stayed bridge with a kilometer span, the length of the stay cable is up to 500m, and if a conventional damper is installed at a position of 5m, the maximum modal damping ratio provided by the conventional damper is theoretically 0.5%, so that various types of vibration of the stay cable cannot be effectively restrained.

The prior art discloses an electromagnetic inertial mass damper, which belongs to an inertial mass damper. Its output force includes not only an electromagnetic damping force but also an inertial force proportional to the relative acceleration. The suspension cable modal damping provided by the inertial damper is higher than that of the viscous damper by an order of magnitude, and the damping ratio obtained by the inertial damper is several times higher than that of the viscous damper.

However, in practical engineering, the vibration direction of the stay cable is arbitrary, and engineering vibration damping mainly divides the vibration of the stay cable into in-plane vibration damping and out-of-plane vibration damping. The electromagnetic inertial mass damper in the prior art is used for unidirectional vibration reduction, and cannot meet the in-plane vibration reduction and out-of-plane vibration reduction of the bridge stay cable. If two electromagnetic inertial mass dampers are simultaneously connected to the stay cable to damp in-plane and out-of-plane vibration, the layout space is limited due to the structural length problem of the electromagnetic inertial mass dampers themselves.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a bidirectional vibration damping electromagnetic inertial mass damper, so as to solve the problem that the layout space of the damper is limited when the electromagnetic inertial mass damper in the prior art is used for satisfying the in-plane vibration damping and out-of-plane vibration damping of a bridge stay cable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the application provides a bi-directional vibration damping electromagnetic inertial damper, comprising:

the connecting mechanism is used for fixing and arranging;

the two damper units comprise a ball screw transmission mechanism, a flywheel damping mechanism and a universal coupling, wherein the ball screw transmission mechanism is used for being connected with the vibration-damped piece, the ball screw transmission mechanism and the flywheel damping mechanism are both connected with the connecting mechanism, and the ball screw transmission mechanism and the axis of the flywheel damping mechanism are in a set angle and are in transmission connection through the universal coupling.

In some alternative embodiments, the ball screw transmission mechanism includes:

a bracket connected to the connection mechanism;

one end of the push rod is used for being connected with the vibration-damped piece;

the ball screw is rotationally connected with the bracket and is connected with the universal coupling;

and a ball nut which is screw-engaged with the ball screw and is connected to the other end of the push rod, wherein the ball screw rotates when the push rod is pushed to perform linear motion.

In some alternative embodiments, the ball screw transmission mechanism further comprises a guide rail connected to the bracket for making the push rod move linearly along a set direction.

In some alternative embodiments, the ball screw transmission mechanism further comprises a bearing support arranged on the bracket, wherein the bearing support is sleeved outside the ball screw and used for supporting the ball screw.

In some alternative embodiments, the flywheel damping mechanism includes a speed increaser, a flywheel, a coupling, and a motor connected in sequence, the speed increaser is connected to the universal coupling for increasing the rotational speed of the flywheel, and the motor is connected to the connection mechanism.

In some alternative embodiments, the ball screw transmission mechanism housing is provided with a first housing, the first housing is fixedly connected with the bracket, the push rod is slidably connected with the first housing, the ball screw is connected with the universal coupling through the first housing, and the first housing is connected with the connecting mechanism.

In some alternative embodiments, the flywheel damping mechanism housing is provided with a second casing, the other end of the universal coupling away from the ball screw transmission mechanism passes through the second casing to be connected with the speed increaser, and the motor is fixedly connected with the second casing and is connected with the connecting mechanism through the second casing.

In some alternative embodiments, the above-described connection mechanism includes:

the first cross rod, the first shell and the second shell of the two damper units are fixed on the first cross rod, so that the axes of the ball screw transmission mechanism and the flywheel damping mechanism form a set angle;

two ends of the second cross rod are respectively connected with the second shells of the two damper units;

and the vertical rod is connected between the first transverse rod and the second transverse rod.

In some alternative embodiments, the motor is a DC motor.

In some alternative embodiments, both ends of the ball screw drive away from the universal joint are hinged to the cable ties.

Compared with the prior art, the utility model has the advantages that: the two damper units are connected, so that the problems of in-plane vibration reduction and out-of-plane vibration reduction of the bridge stay cable can be solved; the ball screw transmission mechanism and the flywheel damping mechanism of each damper unit are connected in an angle through the connecting mechanism, so that the problem of limited space arrangement on a bridge is solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a bi-directional vibration damping electromagnetic inertial damper according to the present utility model.

In the figure: 1. a damper unit; 11. a ball screw transmission mechanism; 111. a push rod; 112. a ball screw; 113. a ball nut; 114. a guide rail; 115. a first housing; 12. a flywheel damping mechanism; 121. a speed increaser; 122. a flywheel; 123. a coupling; 124. a motor; 125. a second housing; 13. a universal coupling; 14. a cable hoop; 2. a connecting mechanism; 21. a first cross bar; 22. a second cross bar; 23. a vertical rod; 3. a vibration-damped member.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

An embodiment of a bi-directional vibration damping electromagnetic inertial damper according to the present utility model is described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, the present application provides a bi-directional vibration damping electromagnetic inertial damper comprising two damper units 1 and a connecting mechanism 2 for a fixed arrangement. One end of each damper unit 1 is used for being connected with the vibration-damped part 3, and the two damper units 1 are positioned on two different surfaces of the vibration-damped part 3, so that bidirectional vibration damping of the vibration-damped part 3 can be better realized.

Specifically, the damper unit 1 includes a ball screw transmission mechanism 11, a flywheel damper mechanism 12, and a universal joint 13, wherein the ball screw transmission mechanism 11 is used for being connected with the vibration-damped member 3, the ball screw transmission mechanism 11 and the flywheel damper mechanism 12 are both connected with the connection mechanism 2, and the ball screw transmission mechanism 11 and an axis of the flywheel damper mechanism 12 form a set angle and are in transmission connection through the universal joint 13.

In this example, the ball screw transmission mechanism 11 and the flywheel damping mechanism 12 are connected at a set angle through the universal joint 13 to form a V-shaped damper unit 1, and V-shaped openings of the two damper units 1 are opposite. When the electromagnetic inertial damper for bidirectional vibration damping is installed on the stay cable, the two damper units 1 are symmetrically arranged by taking the stay cable as an axis. The connection mechanism 2 is used to hold the ball screw transmission mechanism 11 and the flywheel damping mechanism 12 at the set angle.

It can be understood that when the vibration-damping member 3 vibrates, the ball screw transmission mechanism 11 receives force in the axial direction, and converts the force into the inertial force and electromagnetic damping force of the flywheel damping mechanism 12, thereby playing a role in vibration damping. And the axis of the ball screw transmission mechanism 11 and the axis of the flywheel damping mechanism 12 are in a set angle, so that the installation space can be saved, and the installation and the arrangement are convenient.

In some alternative embodiments, the ball screw transmission mechanism 11 includes a bracket, a push rod 111, a ball screw 112, and a ball nut 113, the bracket is connected to the connection mechanism 2, and one end of the push rod 111 is used to connect to the damped part 3; the ball screw 112 is rotatably connected with the bracket and is connected with the universal coupling 13; a ball nut 113 is screwed to the ball screw 112 and connected to the other end of the push rod 111, and when the push rod 111 is pushed to perform linear motion, the ball screw 112 rotates.

It will be appreciated that when the vibration damper 3 vibrates, the push rod 111 is pushed and drives the ball nut 113 to move along the length direction of the ball screw 112, and at this time, the linear displacement of the ball nut 113 is converted into rotation of the ball screw 112 by the threaded engagement of the ball nut 113 and the ball screw 112, thereby driving the universal joint 13 to rotate. The bracket is connected to the connection mechanism 2, and the relative position is kept fixed, so that the ball screw 112 is fixed to ensure that the ball nut 113 can linearly move on the ball screw 112, and the ball screw 112 is kept axially fixed to rotate.

Accordingly, the ball nut 113 moves on the ball screw 112 to convert the linear motion into the rotational motion, and the generated friction damping also provides the damping force to the vibration-damped member 3.

In some alternative embodiments, the ball screw transmission mechanism 11 further includes a guide rail 114, and the guide rail 114 is connected to the bracket, so as to make the push rod 111 move linearly in a set direction.

In order to further stabilize the movement of the push rod 111 to push the ball nut 113 on the ball screw 112, a guide rail 114 is provided to move the push rod 111 in the set direction. The guide rail 114 is parallel to the longitudinal direction of the ball screw 112.

In some alternative embodiments, the ball screw transmission mechanism 11 further includes a bearing support disposed on the bracket, and the bearing support is sleeved outside the ball screw 112, for supporting the ball screw 112.

It will be appreciated that the bearing support may increase the structural stability of the ball screw 112 for supporting and restraining the ball screw 112, ensuring the connection of the ball screw 112 and the bracket. The bearing support is rotatably connected to the ball screw 112.

In some alternative embodiments, the flywheel damper mechanism 12 includes a speed increaser 121, a flywheel 122, a coupling 123, and a motor 124 connected in sequence, the speed increaser 121 is connected to the universal coupling 13 for increasing the rotational speed of the flywheel 122, and the motor 124 is connected to the connection mechanism 2.

It will be appreciated that one end of the universal coupling 13 is connected to the ball screw 112, the other end is fixedly connected to the input end of the speed increaser 121, the output end of the speed increaser 121 is connected to the flywheel 122, the coupling 123 is used for connecting the flywheel 122 to the motor 124, and the motor 124 is connected to the connection mechanism 2.

When the universal coupling is used, the universal coupling 13 transmits the rotation of the ball screw 112 to the speed increaser 121, and the speed increaser 121 is utilized to improve the rotation speed so as to obtain higher inertia mass and electromagnetic damping force; flywheel 122 may provide an inertial mass, producing an inertial damping force; the motor 124 adopts a direct current motor, converts kinetic energy into electric energy through an electromagnetic induction principle, and thus realizes dissipation of structural energy and control of vibration.

In some alternative embodiments, the ball screw transmission mechanism 11 is provided with a first housing 115, the first housing 115 is fixedly connected to the bracket, the push rod 111 is slidably connected to the first housing 115, the ball screw 112 is connected to the universal joint 13 through the first housing 115, and the first housing 115 is connected to the connection mechanism 2.

It will be appreciated that the bracket, ball screw 112 and ball nut 113 are disposed within the first housing 115, and that one end of the push rod 111 passes through the first housing 115 and is slidably coupled to the first housing 115, and that the universal joint 13 is rotatably coupled to the first housing 115. The first housing 115 can protect the ball screw transmission mechanism 11 from influencing the movement of the screw by foreign objects falling into the ball screw transmission mechanism during operation. And the first housing 115 is connected to the connection mechanism 2, so that the relative position of the ball screw transmission mechanism 11 can be maintained.

In some alternative embodiments, the flywheel damper mechanism 12 is provided with a second housing 125, the other end of the universal joint 13 remote from the ball screw transmission mechanism 11 is connected to the speed increaser 121 through the second housing 125, and the motor 124 is fixedly connected to the second housing 125 and is connected to the connecting mechanism 2 through the second housing 125.

It will be appreciated that the second housing 125 protects the flywheel damping mechanism 12 from foreign objects falling into the flywheel during operation. And the second housing 125 is connected to the connection mechanism 2, so that the relative position of the flywheel damper mechanism 12 can be maintained.

Since the first housing 115 and the second housing 125 are both connected to the connection mechanism 2, the ball screw transmission mechanism 11 and the flywheel damping mechanism 12 can be held at a set angle by the universal joint 13. The purpose of this is to keep the electromagnetic inertial damper of the whole bi-directional vibration damping in a bent shape, thus adapting to the installation environment and ensuring structural stability for better vibration damping.

In some alternative embodiments, the first housing 115 and the second housing 125 may be integrally formed to form a set angle between the ball screw transmission mechanism 11 and the flywheel damping mechanism 12.

In some alternative embodiments, the ends of the ball screw transmission mechanisms 11 remote from the universal couplings 13 are each connected to a stay cable via a cable tie 14.

When the electromagnetic inertial damper for bidirectional vibration reduction is applied to a rope stayed bridge, one end of the push rod 111 is connected with the rope stayed cable through the rope hoop 14, and when the rope stayed cable vibrates under stress, the vibration is converted into the movement of the push rod 111 along the direction of the guide rail 114, and then is converted into an electromagnetic damping force, so that vibration reduction is realized.

Because the stress vibration amplitude of the stay cable is converted into the motion displacement of the push rod 111 which is generally between 5mm and 10mm, the push rod 111 and the cable hoop 14 can be hinged, so that when the stay cable is stressed on one side or the stress on the inner side and the outer side is unequal, the structural stability and the vibration reduction effect of the electromagnetic inertial mass damper with bidirectional vibration reduction are maintained, and the influence of the damper unit on one side with smaller stress or without stress on the vibration reduction of the damper unit on the other side is avoided.

In some alternative embodiments, the connecting mechanism 2 includes a first cross bar 21, a second cross bar 22, and a vertical bar 23, and the first housing 115 and the second housing 125 of the two damper units 1 are fixed on the first cross bar 21, so that the ball screw transmission mechanism 11 forms a set angle with the axis of the flywheel damping mechanism 12; both ends of the second cross bar 22 are respectively connected to the second housings 125 of the two damper units 1; a vertical rod 23 is connected between the first cross bar 21 and the second cross bar 22.

In this example, the first cross bar 21 is connected between the two damper units 1, and both end surfaces of the first cross bar 21 are fixedly connected with the first housing 115 and the second housing 125 of one damper unit 1, respectively, by bolts. This makes it possible to maintain the axes of the ball screw transmission mechanism 11 and the flywheel damping mechanism 12 of the damper unit at the set angle. The two ends of the second cross bar 22 are fixedly connected with the second housings 125 of the two damper units through bolts, respectively, and the second cross bar 22 may be connected with the bridge through a connecting member or directly connected to the bridge.

In some alternative embodiments, the motor 124 is a DC motor.

It can be understood that the direct current motor can convert the vibration energy of the structure into electric energy, the energy conversion efficiency is higher, the collected electric energy can reach the level above watt under the normal structure vibration condition, and the direct current motor has the capability of being combined with a structure health monitoring system and a wireless sensing system and independently providing electric energy for the systems; in addition, the DC motor adopts Faraday electromagnetic induction principle, and the induction voltage and the vibration speed of the structure have good linear relation and can be used as a speed sensor.

In some alternative embodiments, the electromagnetic viscous damping coefficient of the device can be accurately adjusted by changing parameters such as the electrical constant of the motor 124 and the external resistor of the motor, so that an accurate mechanical model is provided, and analysis and design are facilitated.

The working principle of the embodiment of the application is as follows: the cable hoop 14 is sleeved on the stay cable to be damped, and the connecting mechanism 2 is fixedly connected with the bridge. When the stay cable vibrates and pushes the push rod 111, the push rod 111 drives the ball nut 113 to move along the length direction of the ball screw 112, at the moment, the linear displacement of the ball nut 113 is converted into rotation of the ball screw 112 through the threaded cooperation of the ball nut 113 and the ball screw 112, so that the universal coupling 13 is driven to rotate, the universal coupling 13 transmits the rotation of the ball screw 112 to the speed increaser 121, and the speed increaser 121 is utilized to increase the rotation speed so as to obtain higher inertia mass and electromagnetic damping force; flywheel 122 may provide an inertial mass, producing an inertial damping force; the motor 124 adopts a direct current motor, converts kinetic energy into electric energy through an electromagnetic induction principle, and thus realizes dissipation of structural energy and control of vibration.

According to the electromagnetic inertial damper for bidirectional vibration reduction, the flywheel and the motor are connected in series to form electromagnetic damping force, inertial force and friction damping force which are connected in parallel to form three damping forces, the flywheel can generate inertial coefficients which are tens of thousands times of self-mass through rotation, and the direct current motor can convert vibration energy into electric energy through rapid rotation and generate electromagnetic damping, so that a better vibration reduction effect is achieved; by arranging the two damper units 1 on two different surfaces of the damped part 3, the two-way damping of the damped part 3 can be better realized, the installation space can be saved, and the installation and the arrangement are convenient; the ball screw transmission mechanism 11 and the axis of the flywheel damping mechanism 12 form a set angle through the connecting mechanism 2 and are kept at the set angle, so that the installation environment is adapted, and the structural stability is ensured to better damp vibration.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A bi-directional vibration-damping electromagnetic inertial damper, comprising:

a connecting mechanism (2) for fixing the arrangement;

the two damper units (1), the damper units (1) comprise a ball screw transmission mechanism (11), a flywheel damping mechanism (12) and a universal coupling (13), the ball screw transmission mechanism (11) is used for being connected with a vibration damping piece (3), the ball screw transmission mechanism (11) and the flywheel damping mechanism (12) are both connected with the connecting mechanism (2), and the ball screw transmission mechanism (11) and the axis of the flywheel damping mechanism (12) are in a set angle and are in transmission connection through the universal coupling (13).

2. The bi-directional vibration-reducing electromagnetic inertial damper according to claim 1, characterized in that the ball screw transmission (11) comprises:

a bracket connected to the connection mechanism (2);

a push rod (111) having one end for connecting with the vibration-damped member (3);

a ball screw (112) rotatably connected to the bracket and connected to the universal joint (13);

and a ball nut (113) which is screwed with the ball screw (112) and is connected to the other end of the push rod (111), wherein the ball screw (112) rotates when the push rod (111) is pushed to perform linear motion.

3. The bi-directional vibration-damping electromagnetic inertial damper according to claim 2, characterized in that the ball screw transmission mechanism (11) further comprises a guide rail (114), the guide rail (114) being connected to the bracket for rectilinear movement of the push rod (111) in a set direction.

4. The electromagnetic inertial damper of claim 2, wherein the ball screw transmission mechanism (11) further comprises a bearing support arranged on the bracket, and the bearing support is sleeved outside the ball screw (112) and is used for supporting the ball screw (112).

5. The bidirectional vibration damping electromagnetic inertial damper according to claim 2, wherein the flywheel damping mechanism (12) comprises a speed increaser (121), a flywheel (122), a coupling (123) and a motor (124) which are sequentially connected, the speed increaser (121) is connected with the universal coupling (13) and is used for increasing the rotating speed of the flywheel (122), and the motor (124) is connected with the connecting mechanism (2).

6. The electromagnetic inertial damper of claim 5, wherein the ball screw transmission mechanism (11) is provided with a first shell (115) in a cover, the first shell (115) is fixedly connected with the bracket, the push rod (111) is slidably connected with the first shell (115), the ball screw (112) passes through the first shell (115) to be connected with the universal coupling (13), and the first shell (115) is connected with the connecting mechanism (2).

7. The electromagnetic inertial damper with bidirectional vibration damping according to claim 6, wherein the flywheel damping mechanism (12) is provided with a second housing (125), the other end of the universal coupling (13) away from the ball screw transmission mechanism (11) passes through the second housing (125) to be connected with the speed increaser (121), and the motor (124) is fixedly connected with the second housing (125) and is connected with the connecting mechanism (2) through the second housing (125).

8. The bi-directional vibration-reducing electromagnetic inertial damper according to claim 6, characterized in that the connecting mechanism (2) comprises:

a first cross bar (21), wherein a first shell (115) and a second shell (125) of the two damper units (1) are fixed on the first cross bar (21) so as to enable the ball screw transmission mechanism (11) and the axis of the flywheel damping mechanism (12) to form a set angle;

a second cross bar (22) having both ends connected to second housings (125) of the two damper units (1), respectively;

and a vertical rod (23) connected between the first cross rod (21) and the second cross rod (22).

9. The bi-directional vibration-damped electromagnetic inertial damper of claim 5, wherein the motor (124) is a dc motor.

10. A bi-directional vibration-damping electromagnetic inertial damper according to claim 1, characterized in that the ends of the two ball screw drive mechanisms (11) remote from the universal joint (13) are both hinged to the cable hoop (14).