CN114622760B

CN114622760B - Mass equivalent inertial capacity vibration damper

Info

Publication number: CN114622760B
Application number: CN202111290128.2A
Authority: CN
Inventors: 戴靠山; 唐家伟; 曾雯琳; 杨磊; 陈天诚; 王浩; 张松涵
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2023-03-24
Anticipated expiration: 2041-11-02
Also published as: CN114622760A

Abstract

The invention relates to a mass equivalent inertial capacity vibration damping device belonging to the technical field of vibration damping and energy consumption of civil engineering structures. The device is integrally and symmetrically arranged, the mass disc is fixed with the ball nut through the disc expansion groove, and when the ball nut moves axially along the ball screw, the mass disc has translation and rotation effects, so that an inertial capacity mechanism is realized. By means of the connecting rod, the mass disc rotates to enable the rotary damper fixed on the supporting plate to rotate synchronously, and therefore structural energy consumption is achieved. Two groups of springs are used for tuning and expanding the degree of freedom respectively, and the springs are matched with the mass disc to play the effects of tuning and increasing the rotational kinetic energy respectively. The device gives the mass unit the effect of inertial capacity through a mechanical transmission mode, and compared with a classical tuned mass damper, the device has the advantages of wider control frequency band, better energy consumption efficiency and wide application scene.

Description

Mass equivalent inertial capacity vibration damper

Technical Field

The invention belongs to the technical field of vibration reduction and energy consumption of civil engineering structures, and particularly relates to a mass equivalent inertial volume tuning vibration reduction device.

Background

The energy-absorbing vibration-damping technology is used as an effective structural vibration-damping mode and is widely applied to the aspects of wind resistance and earthquake resistance of civil structures. The energy absorption and vibration reduction is usually realized by adding a group of subsystems on a main structure, realizing the consistency with the structure frequency by adjusting the parameters of a damper to achieve resonance, and transferring the energy of an input structure into the auxiliary subsystems to dissipate the energy of the main structure and reduce the response amplitude of the structure so as to avoid the damage of the structure. When the control method is a passive control mode, the control method can be performed spontaneously, external energy input is not needed, the performance stability is good, and the inspection and maintenance are easy.

The classic Tuned Mass Damper (TMD) is simple in structure, is realized only by a set of mass-spring-damping mechanical units, can be controlled for a certain specific frequency, and has some defects of response lag, narrow control frequency band range and the like. An inertial capacitance element is added on the basis of TMD and is combined with a mass-spring-damping unit, so that the frequency control width of the device can be further widened, and the energy storage and energy absorption effects are enhanced. However, the conventional capacitive elements require additional separate consideration and design, are not adjustable once set, are complicated to construct, and are prone to structural damage.

Disclosure of Invention

In view of the above disadvantages, the present invention provides an inerter device for equalizing a mass unit, which converts a part of the translational energy into rotational energy by using a mechanical transmission method according to the characteristics of the motion. Therefore, under the condition that the inerter unit is not additionally added, the equivalent inerter effect is realized only through the mass unit. Meanwhile, according to actual needs, relevant parameters can be adjusted under the condition that reassembly is not needed, so that the method has more convenience in actual operation, vibration reduction efficiency can be improved, and the mass of the required mass block can be reduced.

In order to achieve the technical purpose, the invention adopts the technical scheme that: a mass equivalent inertial-capacitance type vibration damper comprises a pair of fixed plates, a pair of supporting plates, a ball screw, a ball nut, a pair of springs, two pairs of end plates, a pair of rotary dampers and a group of mass discs, wherein the fixed plates are fixed on a main body structure, the supporting plates are used for supporting an internal device, and the mass equivalent inertial-capacitance type vibration damper comprises a group of mass discs. The support plate and the fixed plate are fixed on the main structure, a ball screw, a ball nut and a pair of springs are arranged between the support plate and the mass disc, and the rotary damper is fixed on the support plate all the time through the fixed disc and is connected with the mass disc through a connecting rod.

Furthermore, the device is a symmetrical device and is symmetrical left and right.

Further, the mass disc is fixed on the expansion circular groove through a bolt; the expansion circular groove is fixed on the ball nut through welding; and the ball nut is nested on the ball screw, so that the mass disc can rotate while translating along the axial direction of the ball screw.

Furthermore, two side faces of the ball nut are fixedly connected with a first end plate respectively, and the other side of the first end plate is connected with a first spring.

Furthermore, two ends of the ball screw are erected on the supporting plate, two end plates are fixed at two axial ends of the screw respectively, and the other side of each end plate is connected with the corresponding fixing plate through a spring II.

Furthermore, the two ends of the connecting rod are uniformly provided with nuts, and the middle of the connecting rod is provided with a spring elastic hole which can be lifted and contracted along the axial direction. The connecting rod vertically penetrates through the uniformly distributed holes in the mass disc, and two ends of the connecting rod are connected with the inner surface of the rotary damper to play a role in transmitting the rotation angular velocity.

Furthermore, the rotary damper is rotationally connected to a fixed disc, and the fixed disc is fixed on the supporting plate through a fixing bolt; four bolt ports are formed in the inner surface of the rotary damper and are connected with the connecting rod, so that the rotating effect of the mass disc can be transmitted to the rotary damper.

Furthermore, when the mass disc and the ball screw are excited by the outside, the mass disc and the ball screw tend to move relatively, and the mass disc can move back and forth along the ball screw through the ball nut, so that the rotating effect can be realized under the action of the ball nut. Through the transmission of connecting rod for the rotation effect can be synchronous mutually with rotary damper, with the kinetic energy that the dissipation main structure produced, reduces the response of structure.

Furthermore, a metal box body is packaged outside the device, and the box body is installed on the main structure platform through a metal plate.

The present invention has the following advantageous effects.

(1) Under the action of wind load and earthquake, when the structure generates large-amplitude vibration, the mass block can move in a specific direction, and unidirectional vibration damping control on the structure is realized.

(2) Due to the rotation characteristic of the mass disc of the device, the effect of temporary rotation energy storage can be realized, and the function of inertial capacity is achieved.

(3) The device integrates the mass disc and the inertial volume unit, effectively reduces the total mass of the device and reduces the additional load generated on the main structure.

(4) The invention can conveniently change the frequency and the damping ratio by adjusting the mass of the mass disc, adjusting the damping size, adjusting the spring stiffness and the like so as to adapt to the vibration reduction requirements under different external excitations.

(5) The device also has the characteristics of reasonable design, simple structure, convenient processing, convenient installation, lower cost and the like.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of an inertial volume unit according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a mass disc according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a damping unit according to an embodiment of the present invention.

The reference numbers are as follows: 1. a mass disc; 2. a ball nut; 3. a disc expansion slot; 4. a first end plate; 5. a first spring; 6. a connecting rod; 7. a ball screw; 8. a rotary damper; 9. fixing the disc; 10. fixing the bolt; 11. a support plate; 12. a second end plate; 13. a second spring; 14. a fixing plate; 15. the foot supporting point is fixed.

Detailed Description

The invention will be further described with reference to the drawings, but the scope of the invention is not limited thereto.

As shown in fig. 1 to 4, the mass equivalent inerter vibration damping device of the present invention includes a fixed support unit, a screw rod transmission unit, a mass equivalent inerter unit, and a damping energy consumption unit. And a screw rod transmission unit and a damping energy consumption unit are arranged on the fixed supporting unit, and a mass equivalent inertial capacity unit is arranged on the screw rod transmission unit.

The fixed supporting unit comprises a supporting plate 11 and a fixing plate 14, and is fixed in the main structure by adding bolts or welding on a fixing foot point 15 so as to support the upper accessory component. In the backup pad 11, the circular port is left at the middle part, leaves the bolt hole in upper portion scope all around.

As shown in fig. 2, the mass equivalent inerter unit comprises a mass disc 1, a ball nut 2, a disc expansion slot 3 and a first end plate 4. A plurality of fixed disk expansion slots 3 are installed on the ball nut 2, and a plurality of mass disks 1 can be installed on the disk expansion slots 3 by bolts. Four circular holes are left in the mass disc 1 so that the connection plate 6 can pass through.

The screw transmission unit is connected through the fixed support unit and comprises a ball screw 7, a connecting rod 6, a first spring 5, a second spring 13 and a second end plate 13. The ball screw 7 is arranged in a circular opening in the middle of the support plate 11, and the weight of the mass equivalent inertia-capacitance unit and the weight of the screw unit are borne through the circular opening. One end of the first spring 5 is connected in the support plate 11, and the other end is fixedly connected with the first end plate 4. One end of the second spring 13 is connected with the fixing plate 14, and the other end is fixed on the second end plate 12. As shown in fig. 3, the connecting rod 6 has a plurality of spring holes at a middle portion thereof, and is extendable and retractable in the axial direction, and nut ports are left at end portions at both ends in the axial direction. The connecting rods 6 are arranged in the periphery of the mass disc 1 and vertically penetrate through round holes reserved in the mass disc 1.

As shown in fig. 4, the damping energy dissipation unit is composed of a rotary damper 8, a fixed disk 9 and a fixed bolt 10. Round holes are reserved on the periphery of the inner surface of the rotary damper 8, and bolts are arranged in the round holes and connected with the connecting rod 6. The rotary damper 8 is rotatably connected to the fixed disk 9, and the fixed disk 9 and the support plate 11 are fixed to each other by the fixing bolt 11. The connecting rod 6 drives the rotary damper 8 to rotate, and meanwhile, an energy dissipation system inside the rotary damper 8 is utilized to absorb and dissipate energy.

The use of the present invention is as follows.

The mass equivalent inertial capacity vibration reduction device can control the vibration of the structure in the horizontal or vertical direction.

When the structure vibrates, the mass disc 1 translates along the axial direction of the ball screw 7 under the action of external excitation. The ball nut 2 and the ball screw 7 perform relative axial movement, so that the ball nut rotates. On the ball nut 2, in an extended circular groove 3 arranged, a corresponding mass disc 1 can be placed. When the mass disc 1 is in translational motion along the axial direction, the mass disc can rotate at the same time, and partial translational kinetic energy is converted into rotational kinetic energy, so that the effect of equivalent inertial capacity is realized. The specific actual physical mass and the specific inertia capacity coefficient value can be realized by changing the shape, size, material, quantity and the like of the disc.

When the mass equivalent inertia unit rotates, the connecting rod 6 is driven to rotate together. The connecting rod 6 is simultaneously connected with the rotary damper 8, so that the damping unit 8 synchronously rotates, and the damping force generated by the internal energy consumption system under the action of rotation is used for absorbing and dissipating energy. Since the rotary damper is fixed in the support plate 11, its force is determined by its angular velocity of rotation, which is related to the amount of relative movement of the spindle nut 2 on the ball screw 7, and the internal damping coefficient.

The first spring is connected with the mass equivalent inertial volume unit and the supporting plate 11, has higher rigidity, and can form a mass tuning system similar to TMD by matching with the actual physical mass of the mass equivalent inertial volume unit, thereby ensuring the consistency with the structural frequency to play a resonance effect.

The ball screw 7 is placed in a central circular hole of the support plate 11 to support the weight of its upper member. Two ends of the second end plate 12 are respectively provided with a second spring 13 which is connected with the second end plate, and the second spring 13 is fixed with a fixing plate 14. The increased degree of freedom thus allows the ball screw 7 to translate in the axial direction, increasing relative movement with the ball nut. And further the rotational angular velocity is increased, so that the rotational damper 8 consumes more energy.

Claims

1. The utility model provides a quality equivalent formula is used to hold vibration damper, includes quality disc (1), ball nut (2), disc expansion groove (3), end plate (4), spring (5), connecting rod (6), ball screw (7), rotary damper (8), fixed disc (9), fixing bolt (10), backup pad (11), no. two spring (13), fixed plate (14), fixed foot fulcrum (15), its characterized in that: the supporting plates (11) are welded or fixed on the structural platform through fixed foot supporting points (15) at the bottom in a bolt anchoring mode and are symmetrically arranged on the same axis; the rotary damper (8) is rotationally connected to the fixed disc (9); the fixed disc (9) is fixed on a support plate (11) through a fixing bolt (10); the ball screw (7) is arranged on the support plates (11) which are symmetrical at two sides and can translate vertically to the support plates (11); the ball nut (2) is nested on the ball screw (7) and can axially move along the ball screw (7); the disc expansion groove (3) is fixed on the surface of the ball nut (2) through welding; the mass disc (1) is fixed in the disc expansion groove (3) through a bolt; the two ends of the connecting rod (6) are connected with the rotary damper (8), and the middle of the connecting rod vertically penetrates through a round hole formed in the mass disc (1).

2. The mass equivalent inerter damping device of claim 1, wherein: the mass disc (1) is a metal or other material disc with uniform mass and high density, the number and the size can be selected according to actual needs, a circular ring groove is arranged on the inner side and is connected with a protruding part of the disc expansion groove (3), a bolt hole is arranged in the thickness direction of the inner side, and a bolt can be inserted in the middle to be fixed with the disc expansion groove (3); near the outer ring, there are four circular holes symmetrical along the axis and perpendicular to the disc surface, so that the connecting rod (6) penetrates therein.

3. The mass equivalent inertance damping device of claim 2, wherein: disc expansion groove (3) are arranged perpendicularly in ball nut (2) central axis direction, through welded fastening on ball nut (2) outer lane surface, and the equidistance arranges that the interval size each other is greater than the twice of quality disc (1) thickness, in groove thickness direction, have the round hole of symmetrical arrangement, fix mutually with quality disc (1) through the bolt.

4. The mass equivalent inerter damping device of claim 1, wherein: the ball nut (2) is nested on the ball screw (7) and moves along the axial direction of the ball screw (7), a disc expansion groove (3) is fixed on the outer surface of the ball nut (2), and first end plates (4) are arranged at the two ends of the ball nut; the ball screw (7) is vertically supported on the support plate (11) and can translate along the direction vertical to the support plate, and two ends of the ball screw (7) are provided with a second end plate (12); the middle part of the supporting plate (11) is provided with a round hole, the diameter of the round hole is larger than that of the ball screw (7), and the ball screw can penetrate through and move.

5. The mass equivalent inerter damping device of claim 1, wherein: the rotary damper (8) is rotationally connected to the fixed disc (9); the fixed disc (9) is fixed on the support plate (11) through a fixed bolt (10); round holes are formed around the rotary damper (8), and a screw rod is arranged in each round hole and can be mutually anchored with a screw cap at the end part of the connecting rod (6); the connecting rod (6) is a slender round straight rod, a bayonet is arranged in the connecting rod, the connecting rod can be contracted along the axial direction so as to change the length of the rod, the connecting rod vertically penetrates through round holes reserved on the periphery of the mass disc (1), and the end part of the connecting rod is fixed with the rotary damper (8); the connecting rod (6) drives the rotary damper (8) to rotate, and meanwhile, an energy dissipation system inside the rotary damper (8) is utilized to absorb and dissipate energy.

6. The mass equivalent inerter damping device of claim 1, wherein: the first spring (5) and the second spring (13) are symmetrically arranged in the axial direction, one end of the first spring (5) is fixed with the first end plate (4) at the end part of the ball nut (2), the other end of the first spring is fixed at a round hole reserved in the supporting plate (11), and the diameter of the spring is slightly larger than that of the ball screw (7) so as to avoid the problems of collision and contact; one end of a second spring (13) is connected with a second end plate (12) at the end part of the ball screw (7), and the other end of the second spring is fixed at the central position of a fixed plate (14); the fixing plate (14) is welded or anchored on a platform of the main structure through a fixing foot supporting point (15) at the bottom.