Two-section type variable-curvature variable-friction-coefficient semi-active tuned mass damper

Abstract

The invention provides a two-section type variable-curvature variable-friction-coefficient semi-active tuned mass damper which comprises a damper part, a servo control part, a small-amplitude vibration control part and a large-amplitude vibration control part, and the servo control part controls the small-amplitude vibration control part and the large-amplitude vibration control part in a unified mode. According to the tuned mass damper, the accurate natural vibration frequency under small-amplitude vibration can be ensured through the constant-curvature sliding surface; limiting of the mass block under large-amplitude vibration is ensured through the variable-curvature sliding face, and the buffer collision limiting block can further prevent the mass block from being overlarge in stroke. The friction coefficient of the sliding surface of the friction pendulum support is changed through the controllable oil film system, so that semi-active adjustment of the frequency and damping of the tuned mass damper is achieved, and the vibration reduction effect is improved. The magneto-rheological damper can improve the energy dissipation and shock absorption effects of the damper under the driving of the servo control system, and the high-strength steel strand can prevent the mass block and the friction pendulum support from overlarge strokes so as to play a role in limiting.

Description

Technical Field

[0001] The invention belongs to the technical fields of civil engineering and vibration control, and in particular relates to a two-stage variable curvature and variable friction coefficient semi-active tuned mass damper. Background Art

[0002] Earthquakes are extremely destructive and dangerous natural disasters. At the same time, typhoons are also common natural disasters in coastal areas. Structural vibration control is one of the current hot research directions in the field of civil engineering. Its further development of structural intelligent control is also a multidisciplinary cross-research direction of civil engineering, machinery and telecommunications. In order to reduce the damage caused by earthquakes, energy dissipation and shock absorption devices are widely used in building structure shock absorption. Tuned Mass Damper (TMD) is a single-degree-of-freedom dynamic vibration absorber composed of three units: mass, stiffness and damping. When the frequency ratio and damping ratio of TMD are properly adjusted, it can play a good vibration control effect. However, the passive tuned mass damper in current engineering applications is sensitive to its own dynamic parameters and difficult to adjust the parameters. The shock absorption effect of the tuned mass damper with misaligned frequency and damping ratio will be greatly reduced. In order to improve the above-mentioned defect that the control effect of the passive tuned mass damper is sensitive to its own parameters, the semi-active tuned mass damper came into being. The semi-active tuned mass damper can change its own dynamic parameters in real time to improve the shock absorption effect. However, the existing semi-active tuned mass damper can only control the unidirectional vibration of the structure. If the bidirectional multi-hazard response of an actual high-rise building needs to be controlled, at least two dampers need to be installed, resulting in excessive building space occupation and excessive economic costs. In summary, the present invention proposes a semi-active tuned mass damper that can simultaneously control the bidirectional dynamic response of a building structure, which has strong practical value. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a two-stage variable curvature and variable friction coefficient semi-active tuned mass damper that can simultaneously control the bidirectional dynamic response of a building structure.

[0004] The objective of the present invention is achieved through the following technical solutions: A two-stage variable curvature and variable friction coefficient semi-active tuned mass damper, comprising: a mass block, a friction pendulum support, a lower slide plate and a servo control system, wherein the lower slide plate is connected to the floor of a building structure by bolt connection or welding, the friction pendulum support is placed on the lower slide plate and can slide smoothly in both directions on the lower slide plate, the friction pendulum support has a downwardly concave arc-shaped sliding surface and a controllable oil film system, the arc-shaped sliding surface is divided into a constant curvature sliding surface and a variable curvature sliding surface, the constant curvature sliding surface is a circular area extending outward from the center of the friction pendulum support, and the variable curvature sliding surface is arranged on the constant curvature sliding surface. The outside of the moving surface is a circular ring area concentric with the constant curvature sliding surface, the curvature radius of the variable curvature sliding surface gradually decreases from the junction with the constant curvature sliding surface to the outside, the mass block is placed on the arc-shaped sliding surface of the friction pendulum support and can slide smoothly in both directions on the arc-shaped sliding surface, the buffer collision limit block is bolted or welded to the outer edge of the friction pendulum support to limit the mass block, the bracket is bolted or welded to the lower sliding plate, the high-strength steel strand passes through the magnetorheological damper and the two ends of the high-strength steel strand are respectively clamped with the bracket and the friction pendulum support through reserved fasteners.

[0005] The mass block, the friction pendulum support and the lower slide plate form the damper portion of the semi-active tuned mass damper.

[0006] The controllable oil film system, magnetorheological damper and servo control system form the servo control part of the semi-active tuned mass damper. The servo control system drives the controllable oil film system and the magnetorheological damper to work based on the analysis and processing of the sensor signals of the sensors arranged on the damper part: the controllable oil film system can change the thickness of the oil film under the drive of the servo control system to adjust the friction coefficient of the constant curvature sliding surface and / or the variable curvature sliding surface in real time; the magnetorheological damper can increase the damping under the drive of the servo control system, thereby improving its energy dissipation and shock absorption effect and preventing excessive displacement of the friction pendulum support.

[0007] The constant curvature sliding surface and the controllable oil film system form the small-amplitude vibration control part of the semi-active tuned mass damper. The constant curvature sliding surface is used to ensure the accurate natural frequency of the mass block under small-amplitude vibration, thereby improving the two-way vibration control performance. The controllable oil film system is used to change the thickness of the oil film under the drive of the servo control system to adjust the friction coefficient of the constant curvature sliding surface in real time, thereby changing the frequency and damping ratio of the semi-active tuned mass damper.

[0008] The variable curvature sliding surface, the controllable oil film system, the buffer collision limit block, the bracket, the magnetorheological damper and the high-strength steel strand form a large vibration control part of the semi-active tuned mass damper. The curvature radius of the variable curvature sliding surface is smaller than the curvature radius of the constant curvature sliding surface to control the stroke of the mass block under large vibration, thereby ensuring that the mass block will not rush out of the arc-shaped sliding surface of the friction pendulum support under large vibration. The controllable oil film system is used to change the thickness of the oil film under the drive of the servo control system to adjust the friction coefficient of the variable curvature sliding surface in real time to control the stroke of the mass block. The buffer collision limit block is used to limit the mass block so that the mass block will slide together with the friction pendulum support on the sliding plate under large vibration. The magnetorheological damper can improve the energy dissipation and shock absorption effect of the damper under the drive of the servo control system and prevent the friction pendulum support from having excessive displacement. The high-strength steel strand is used to limit the mass block and the friction pendulum support that slide together to prevent excessive stroke.

[0009] The curvature radius of the constant curvature sliding surface is a constant value in the range of 4 m to 20 m, and the curvature radius of the variable curvature sliding surface is gradually reduced from the constant value. The curvature function of different positions of the variable curvature sliding surface can be obtained by numerical calculation and finite element simulation optimization. The specific calculation and finite element simulation optimization method does not belong to the technical problem to be solved by the present invention, and belongs to the prior art known to those skilled in the art, and will not be repeated here.

[0010] The bracket, the magnetorheological damper and the high-strength steel strand each constitute a set of kits. Preferably, the semi-active tuned mass damper is provided with 4 to 8 sets of the kits.

[0011] Wherein, the sensors are respectively arranged on the top surface of the lower slide plate and the top surface of the mass block along the X, Y and Z directions.

[0012] Wherein, the sensor is an acceleration sensor, a velocity sensor or a displacement sensor.

[0013] Wherein, the sensor is connected to the servo control system via wired or wireless transmission.

[0014] Preferably, the number of the buffer collision limit blocks is 4 to 8, and the buffer collision limit blocks are evenly arranged along the outer edge of the friction pendulum support.

[0015] Due to the adoption of the above scheme, the beneficial effects of the present invention are: First, the tuned mass damper of the present invention can simultaneously control the bidirectional vibration of a high-rise building in a plane, and has the advantages of saving building space, saving the amount of dampers, reducing concentrated loads on floors and saving costs.

[0016] Second, the tuned mass damper of the present invention can start to slide under relatively small wind vibrations, and the frequency and damping ratio of the damper are changed by changing the friction coefficient of the sliding surface through a controllable oil film system, thereby improving its bidirectional energy dissipation and shock absorption performance.

[0017] Third, the tuned mass damper of the present invention has better bidirectional vibration control performance than the traditional tuned mass damper because it can adjust its own bidirectional frequency and damping ratio in real time.

[0018] Fourth, under large vibrations, the tuned mass damper of the present invention can improve its control effect through structural forms such as variable curvature sliding surface, buffer collision limit block, friction pendulum bearing joint sliding, magnetorheological damper and high-strength steel stranded wire, reduce the stroke of the mass block, and play a better limiting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the two-stage variable curvature and variable friction coefficient semi-active tuned mass damper of the present invention.

[0020] Figure 2 It is a schematic diagram of the top structure of a preferred embodiment of the two-stage variable curvature and variable friction coefficient semi-active tuned mass damper of the present invention.

[0021] Figure 3 It is a schematic diagram of the top structure of another preferred embodiment of the two-stage variable curvature and variable friction coefficient semi-active tuned mass damper of the present invention.

[0022] Figure numerals: 1-mass block, 2-friction pendulum support, 3-constant curvature sliding surface, 4-variable curvature sliding surface, 5-controllable oil film system, 6-buffer collision limit block, 7-lower slide plate, 8-bracket, 9-magnetorheological damper, 10-servo control system and 11-high-strength steel strand. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the embodiments are not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention.

[0024] like Figure 1 As shown, the two-stage variable curvature and variable friction coefficient semi-active tuned mass damper of the present invention includes: a damper part, a servo control part, a small-amplitude vibration control part and a large-amplitude vibration control part, wherein the servo control part is the control center of the tuned mass damper of the present invention, and uniformly controls the small-amplitude vibration control part and the large-amplitude vibration control part.

[0025] Specifically, it includes: a mass block 1, a friction pendulum support 2, a lower slide plate 7 and a servo control system 10. The lower slide plate 7 is connected to the floor of the building structure by bolt connection or welding. The friction pendulum support 2 is placed on the lower slide plate 7 and can slide smoothly in both directions on the lower slide plate 7. The friction pendulum support 2 has a downwardly concave arc-shaped sliding surface and a controllable oil film system 5. The arc-shaped sliding surface is divided into a constant curvature sliding surface 3 and a variable curvature sliding surface 4. The constant curvature sliding surface 3 is a circular area extending outward from the center of the friction pendulum support 2. The variable curvature sliding surface 4 is arranged outside the constant curvature sliding surface 3 and is connected to the constant curvature sliding surface. In the circular ring area concentric with the moving surface 3, the curvature radius of the variable curvature sliding surface 4 gradually decreases from the junction with the constant curvature sliding surface 3 to the outside, the mass block 1 is placed on the arc-shaped sliding surface of the friction pendulum support 2 and can slide smoothly in both directions on the arc-shaped sliding surface, the buffer collision limit block 6 is bolted or welded to the outer edge of the friction pendulum support 2 to limit the mass block 1, the bracket 8 is bolted or welded to the lower slide plate 7, the high-strength steel strand 11 passes through the magnetorheological damper 9 and the two ends of the high-strength steel strand 11 are respectively clamped with the bracket 8 and the friction pendulum support 2 through reserved fasteners.

[0026] Among them, the curvature radius of the constant curvature sliding surface 3 is a constant value in the range of 4 m to 20 m, and the curvature radius of the variable curvature sliding surface 4 gradually decreases from the constant value. The curvature function of different positions of the variable curvature sliding surface can be obtained by numerical calculation and finite element simulation optimization. The specific calculation and finite element simulation optimization method does not belong to the technical problem to be solved by the present invention, and belongs to the prior art known to those skilled in the art, and will not be repeated here.

[0027] The number of the buffer collision limit blocks 6 is 4 to 8, and the buffer collision limit blocks 6 are evenly arranged along the outer edge of the friction pendulum support 2 .

[0028] Among them, the bracket 8, the magnetorheological damper 9 and the high-strength steel strand 11 are all used in combination, each of which constitutes a set of kits, and the number of kits can be set to 4 to 8 sets. Figure 2 In a preferred embodiment of the present invention shown in FIG. 1 , four groups of brackets 8, magnetorheological dampers 9 and high-strength steel strands 11 are evenly distributed along both sides. Figure 3 In another preferred embodiment of the present invention shown, eight groups of brackets 8, magnetorheological dampers 9 and high-strength steel strands 11 are evenly distributed along both sides.

[0029] Damper part The damper part includes: a mass block 1, a friction pendulum support 2 and a lower slide plate 7. The mass block 1 can slide smoothly in both directions on the friction pendulum support 2, and the friction pendulum support 2 can slide smoothly in both directions on the lower slide plate 7. The mass block 1 can slide smoothly in both directions in a plane through the friction pendulum support 2 to achieve bidirectional vibration control of the structure.

[0030] Servo control part The servo control part includes: a controllable oil film system 5, a magnetorheological damper 9 and a servo control system 10. The servo control system 10 drives the controllable oil film system 5 and the magnetorheological damper 9 to work according to the sensor signal analysis and processing of the sensor arranged on the damper part: the controllable oil film system 5 can change the thickness of the oil film under the drive of the servo control system 10 to adjust the friction coefficient of the constant curvature sliding surface 3 and / or the variable curvature sliding surface 4 in real time, and the magnetorheological damper 9 can increase the damping under the drive of the servo control system 10, thereby improving its energy dissipation and shock absorption effect and preventing the friction pendulum support 2 from excessive displacement.

[0031] The sensor may be an acceleration sensor, a velocity sensor or a displacement sensor. Each sensor is arranged on the top surface of the lower slide plate 7 and the top surface of the mass block 1 along the X, Y and Z directions. Each sensor is connected to the servo control system 10 via wired or wireless transmission.

[0032] Small vibration control part The small amplitude vibration control part includes: a constant curvature sliding surface 3 and a controllable oil film system 5. The constant curvature sliding surface 3 can ensure the accurate natural frequency of the mass block 1 under small amplitude vibration to improve the bidirectional vibration control performance. The controllable oil film system 5 can change the thickness of the oil film under the drive of the servo control system 10 to adjust the friction coefficient of the constant curvature sliding surface 3 in real time, thereby changing the frequency and damping ratio of the semi-active tuned mass damper. In this way, the controllable oil film system 5 can change the friction coefficient of the sliding surface of the friction pendulum support 2 to achieve semi-active adjustment of the frequency and damping of the tuned mass damper and improve the vibration reduction effect.

[0033] Large vibration control part The large-scale vibration control part includes: a variable curvature sliding surface 4, a controllable oil film system 5, a buffer collision limit block 6, a bracket 8, a magnetorheological damper 9 and a high-strength steel strand 11. The curvature radius of the variable curvature sliding surface 4 is smaller than the curvature radius of the constant curvature sliding surface 3 to control the stroke of the mass block 1 under large vibrations, thereby ensuring that the mass block 1 will not rush out of the arc-shaped sliding surface of the friction pendulum support 2 under large vibrations. The controllable oil film system 5 is used to change the thickness of the oil film under the drive of the servo control system 10 to adjust the friction coefficient of the variable curvature sliding surface 4 in real time to control the stroke of the mass block 1. The buffer collision limit block 6 is used to limit the mass block 1 so that the mass block 1 will slide together with the friction pendulum support 2 on the lower slide plate 7 under large vibrations. The magnetorheological damper 9 can improve the energy dissipation and shock absorption effect of the damper under the drive of the servo control system 10 and prevent the friction pendulum support 2 from having excessive displacement. The high-strength steel strand 11 is used to limit to prevent the mass block 1 and the friction pendulum support 2 that slide together from having excessive strokes.

[0034] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by any person skilled in the art based on the above disclosed technical contents shall be regarded as equivalent effective embodiments and shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A two-stage variable curvature and variable friction coefficient semi-active tuned mass damper, characterized in that: include: A mass block (1), a friction pendulum support (2), a lower slide plate (7) and a servo control system (10), wherein the lower slide plate (7) is connected to a floor of a building structure by bolt connection or welding, the friction pendulum support (2) is placed on the lower slide plate (7) and can slide smoothly in both directions on the lower slide plate (7), the friction pendulum support (2) has a downwardly concave arc-shaped sliding surface and a controllable oil film system (5), the arc-shaped sliding surface is divided into a constant curvature sliding surface (3) and a variable curvature sliding surface (4), the constant curvature sliding surface (3) is a circular area extending outward from the center of the friction pendulum support (2), and the variable curvature sliding surface (4) is arranged outside the constant curvature sliding surface (3) and is in contact with the constant curvature sliding surface. The variable curvature sliding surface (4) is a circular ring area concentric with the surface (3), the curvature radius of the variable curvature sliding surface (4) gradually decreases from the junction with the constant curvature sliding surface (3) outwards, the mass block (1) is placed on the arc-shaped sliding surface of the friction pendulum support (2) and can slide smoothly in both directions on the arc-shaped sliding surface, the buffer collision limit block (6) is bolted or welded to the outer edge of the friction pendulum support (2) to limit the mass block (1), the bracket (8) is bolted or welded to the lower slide plate (7), the high-strength steel strand (11) passes through the magnetorheological damper (9), and the two ends of the high-strength steel strand (11) are respectively clamped with the bracket (8) and the friction pendulum support (2) through reserved fasteners; in: The mass block (1), the friction pendulum support (2) and the lower slide plate (7) form a damper part of the semi-active tuned mass damper; The controllable oil film system (5), the magnetorheological damper (9) and the servo control system (10) form a servo control part of the semi-active tuned mass damper. The servo control system (10) drives the controllable oil film system (5) and the magnetorheological damper (9) to work according to the sensor signal analysis and processing of the sensor arranged on the damper part: the controllable oil film system (5) can change the thickness of the oil film under the drive of the servo control system (10) to adjust the friction coefficient of the constant curvature sliding surface (3) and / or the variable curvature sliding surface (4) in real time, and the magnetorheological damper (9) can improve the damping under the drive of the servo control system (10); The constant curvature sliding surface (3) and the controllable oil film system (5) form a small amplitude vibration control part of the semi-active tuned mass damper, the constant curvature sliding surface (3) is used to ensure the accurate natural frequency of the mass block (1) under small amplitude vibration, thereby improving the bidirectional vibration control performance, and the controllable oil film system (5) is used to change the thickness of the oil film under the drive of the servo control system (10) to adjust the friction coefficient of the constant curvature sliding surface (3) in real time, thereby changing the frequency and damping ratio of the semi-active tuned mass damper; The variable curvature sliding surface (4), the controllable oil film system (5), the buffer collision limit block (6), the bracket (8), the magnetorheological damper (9) and the high-strength steel strand (11) form a large vibration control part of the semi-active tuned mass damper. The curvature radius of the variable curvature sliding surface (4) is smaller than the curvature radius of the constant curvature sliding surface (3) to control the stroke of the mass block (1) under large vibration, thereby ensuring that the mass block (1) will not rush out of the arc-shaped sliding surface of the friction pendulum support (2) under large vibration. The controllable oil film system (5) is used to change the oil film under the drive of the servo control system (10). The thickness is used to adjust the friction coefficient of the variable curvature sliding surface (4) in real time to control the stroke of the mass block (1); the buffer collision limit block (6) is used to limit the mass block (1) so that the mass block (1) will slide together with the friction pendulum support (2) on the lower slide plate (7) under large vibration; the magnetorheological damper (9) can improve the energy dissipation and shock absorption effect of the damper and prevent the friction pendulum support (2) from generating excessive displacement under the drive of the servo control system (10); the high-strength steel strand (11) is used to limit the mass block (1) and the friction pendulum support (2) that slide together to prevent excessive stroke.

2. The semi-active tuned mass damper according to claim 1, characterized in that: The radius of curvature of the constant curvature sliding surface (3) is a constant value in the range of 4 m to 20 m, and the radius of curvature of the variable curvature sliding surface (4) gradually decreases from the constant value.

3. The semi-active tuned mass damper according to claim 1, characterized in that: The bracket (8), the magnetorheological damper (9) and the high-strength steel strand (11) each form a set of kits, and the semi-active tuned mass damper is provided with 4 to 8 sets of the kits.

4. The semi-active tuned mass damper according to claim 1, characterized in that: The sensors are respectively arranged on the top surface of the lower slide plate (7) and the top surface of the mass block (1) along the three directions of X, Y and Z.

5. The semi-active tuned mass damper according to claim 1, characterized in that: The sensor is an acceleration sensor, a velocity sensor or a displacement sensor.

6. The semi-active tuned mass damper according to claim 1, characterized in that: The sensor is connected to the servo control system (10) via wired or wireless transmission.

7. The semi-active tuned mass damper according to claim 1, characterized in that: The number of the buffer collision limit blocks (6) is 4 to 8, and the buffer collision limit blocks (6) are evenly arranged along the outer edge of the friction pendulum support (2).

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