Two-stage variable-curvature and variable-friction semi-active tuned mass damper

Abstract

The present invention provides a two-stage variable curvature and variable friction coefficient semi-active tuned mass damper, comprising: 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 uniformly controls the small-amplitude vibration control part and the large-amplitude vibration control part; the tuned mass damper of the present invention can ensure an accurate natural vibration frequency under small-amplitude vibrations through a constant curvature sliding surface; the position limit of the mass block under large-amplitude vibrations is ensured through a variable curvature sliding surface, and a buffer collision limit block can further prevent an excessive stroke of the mass block; the friction coefficient of the sliding surface of the friction pendulum support is changed through a controllable oil film system to realize semi-active adjustment of the frequency and damping of the tuned mass damper and improve the vibration reduction effect; the magnetorheological damper can improve the energy dissipation and shock absorption effect of the damper under the drive of the servo control system, and the high-strength steel strand can prevent an excessive stroke of the mass block and the friction pendulum support to play a position limiting role.

Description

Technical Field

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

[0002] Earthquakes are extremely destructive and dangerous natural disasters. At the same time, typhoons are also common natural disasters frequently occurring in coastal areas. Structural vibration control is one of the hot research directions in the current field of civil engineering, and its further developed structural intelligent control is also a multi-disciplinary research direction involving civil engineering, machinery, and telecommunications. In order to reduce the damage caused by earthquakes, energy dissipation and vibration reduction devices are widely used in building structure vibration reduction. A tuned mass damper (TMD) is a single-degree-of-freedom dynamic vibration absorber, which consists of three units: mass, stiffness, and damping. When the frequency ratio and damping ratio of the TMD are adjusted appropriately, it can achieve good vibration control effects. However, the passive tuned mass dampers in current engineering applications are sensitive to their own dynamic parameters and it is difficult to adjust the parameters. The damping effect of a tuned mass damper with a mismatched frequency and damping ratio will decrease significantly. 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 damping effect. However, the existing semi-active tuned mass dampers can only control the single-direction vibration of the structure. If it is necessary to control the two-way multi-disaster response of an actual high-rise building, at least two dampers need to be installed, resulting in excessive occupation of building space and excessive economic costs. To sum up, the present invention intends to propose a semi-active tuned mass damper that can simultaneously control the two-way 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 semi-active tuned mass damper with variable curvature and variable friction coefficient, which can simultaneously control the two-way dynamic response of a building structure.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] A two-stage variable-curvature and variable-friction coefficient semi-active tuned mass damper, comprising: a mass block, a friction pendulum support, a lower sliding plate, and a servo control system. The lower sliding plate is connected to the floor slab of the building structure by bolts or welding. The friction pendulum support is placed on the lower sliding plate and can slide smoothly in two directions on the lower sliding 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. The variable-curvature sliding surface is an annular area concentric with the constant-curvature sliding surface and located outside the constant-curvature sliding surface. The radius of curvature of the variable-curvature sliding surface gradually decreases outward from the junction with the constant-curvature sliding surface. The mass block is placed on the arc-shaped sliding surface of the friction pendulum support and can slide smoothly in two directions on the arc-shaped sliding surface. A buffer collision limit block is connected to the outer edge of the friction pendulum support by bolts or welding to limit the mass block. A bracket is connected to the lower sliding plate by bolts or welding. High-strength steel strands pass through the magnetorheological damper, and both ends of the high-strength steel strands are clamped to the bracket and the friction pendulum support respectively through reserved fasteners.

[0006] The mass block, the friction pendulum support, and the lower sliding plate form the damper part of the semi-active tuned mass damper.

[0007] The controllable oil film system, the magnetorheological damper, and the servo control system form the servo control part of the semi-active tuned mass damper. The servo control system analyzes and processes the sensing signals of the sensors arranged on the damper part to drive the controllable oil film system and the magnetorheological damper to work: 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.

[0008] 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 vibration 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, and further change the frequency and damping ratio of the semi-active tuned mass damper.

[0009] The variable-curvature sliding surface, the controllable oil film system, the buffer collision limiting block, the bracket, the magnetorheological damper, and the high-strength steel strand form the large-amplitude vibration control part of the semi-active tuned mass damper. The curvature radius of the variable-curvature sliding surface is smaller than that of the constant-curvature sliding surface to control the stroke of the mass block under large-amplitude vibration, so as to ensure that the mass block does not rush out of the arc sliding surface of the friction pendulum bearing under large-amplitude 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 limiting block is used to limit the mass block so that the mass block will slide together with the friction pendulum bearing on the lower sliding plate under large-amplitude vibration. The magnetorheological damper can improve the energy dissipation and shock absorption effect of the damper and prevent the friction pendulum bearing from generating excessive displacement under the drive of the servo control system. The high-strength steel strand is used for limiting to prevent the mass block and the friction pendulum bearing that slide together from having an excessive stroke.

[0010] Among them, the curvature radius of the constant-curvature sliding surface is a constant value within the range of 4 m to 20 m, and the curvature radius of the variable-curvature sliding surface gradually decreases from the constant value. The curvature functions at different positions of the variable-curvature sliding surface can be optimized through numerical calculation and finite element simulation. The specific calculation and finite element simulation optimization methods do not belong to the technical problems to be solved by the present invention and are prior arts known to those skilled in the art, so they will not be elaborated here.

[0011] Among them, one piece of the bracket, the magnetorheological damper, and the high-strength steel strand is a set of kits. Preferably, the semi-active tuned mass damper is provided with 4 to 8 sets of the kits.

[0012] Among them, the sensors are respectively arranged on the top surface of the lower sliding plate and the top surface of the mass block along the three directions of X, Y, and Z.

[0013] Among them, the sensors are acceleration sensors, velocity sensors, or displacement sensors.

[0014] Among them, the sensors are connected to the servo control system through wired or wireless transmission.

[0015] Preferably, the number of the buffer collision limiting blocks is 4 to 8, and each of the buffer collision limiting blocks is uniformly arranged along the outer edge of the friction pendulum bearing.

[0016] Due to the adoption of the above scheme, the beneficial effects of the present invention are:

[0017] First, the tuned mass damper of the present invention can simultaneously control the two-way vibration of a high-rise building in the plane, and has the advantages of saving building use space, reducing the amount of dampers, reducing the concentrated load on the floor, and saving costs.

[0018] Second, the tuned mass damper of the present invention can start to slide under a small wind vibration, and changes the friction coefficient of the sliding surface through a controllable oil film system to change the frequency and damping ratio of the damper, so as to improve its two-way energy dissipation and shock absorption performance.

[0019] Third, since the tuned mass damper of the present invention can adjust its two-way frequency and damping ratio in real time, it has better two-way vibration control performance than traditional tuned mass dampers.

[0020] Fourth, under large-amplitude vibration, the tuned mass damper of the present invention can improve its control effect through structural forms such as variable-curvature sliding surfaces, buffer collision limit blocks, friction pendulum supports sliding together, magnetorheological dampers, and high-strength steel strands, reduce the stroke of the mass block, and play a better limiting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the two-stage variable-curvature variable-friction coefficient semi-active tuned mass damper of the present invention.

[0022] Figure 2 is a top view structural schematic diagram of a preferred embodiment of the two-stage variable-curvature variable-friction coefficient semi-active tuned mass damper of the present invention.

[0023] Figure 3 is a top view structural schematic diagram of another preferred embodiment of the two-stage variable-curvature variable-friction coefficient semi-active tuned mass damper of the present invention.

[0024] Reference 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 sliding plate, 8 - bracket, 9 - magnetorheological damper, 10 - servo control system, and 11 - high-strength steel strand. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be further described below with reference to the drawings and embodiments, but the embodiments do not limit the present invention. Any similar structure and its similar changes of the present invention should be included in the protection scope of the present invention.

[0026] As Figure 1As shown in the figure, 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. Among them, 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.

[0027] 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 bolts or welding. The friction pendulum support 2 is placed on the lower slide plate 7 and can slide smoothly in two directions on the lower slide plate 7. The friction pendulum support 2 has a downward 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 centered on the center of the friction pendulum support 2 and extending outward. The variable curvature sliding surface 4 is an annular area concentric with the constant curvature sliding surface 3 and located outside the constant curvature sliding surface 3. The radius of curvature of the variable curvature sliding surface 4 gradually decreases from the junction with the constant curvature sliding surface 3 outward. The mass block 1 is placed on the arc-shaped sliding surface of the friction pendulum support 2 and can slide smoothly in two directions on the arc-shaped sliding surface. Buffer collision limit blocks 6 are connected to the outer edge of the friction pendulum support 2 by bolts or welding to limit the mass block 1. A bracket 8 is connected to the lower slide plate 7 by bolts or welding. High-strength steel strands 11 pass through the magnetorheological damper 9, and both ends of the high-strength steel strands 11 are clamped to the bracket 8 and the friction pendulum support 2 through reserved fasteners.

[0028] Among them, the radius of curvature of the constant curvature sliding surface 3 is a constant value within the range of 4 m to 20 m, and the radius of curvature of the variable curvature sliding surface 4 gradually decreases from this constant value. The curvature functions at different positions of the variable curvature sliding surface can be optimized through numerical calculation and finite element simulation. The specific calculation and finite element simulation optimization methods do not belong to the technical problems to be solved by the present invention and are prior arts known to those skilled in the art, so they will not be elaborated here.

[0029] Among them, the number of buffer collision limit blocks 6 is 4 to 8, and each buffer collision limit block 6 is evenly arranged along the outer edge of the friction pendulum support 2.

[0030] Among them, the bracket 8, the magnetorheological damper 9, and the high-strength steel strands 11 are all used in a matching manner, with one piece of each as a set of kits. The number of sets of kits can be set to 4 to 8 groups. As Figure 2 In a preferred embodiment of the present invention shown in the figure, four groups of brackets 8, magnetorheological dampers 9, and high-strength steel strands 11 are evenly distributed along both sides. As Figure 3 In another preferred embodiment of the present invention shown in the figure, eight groups of brackets 8, magnetorheological dampers 9, and high-strength steel strands 11 are designed to be evenly distributed along both sides.

[0031] Damper section

[0032] The damper part includes: a mass block 1, a friction pendulum bearing 2, and a lower slide plate 7. The mass block 1 can slide smoothly in both directions on the friction pendulum bearing 2, and the friction pendulum bearing 2 can slide smoothly in both directions on the lower slide plate 7. The mass block 1 can slide smoothly in both directions in the plane through the friction pendulum bearing 2 to achieve the two-way vibration control of the structure.

[0033] Servo control section

[0034] 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 analyzes and processes the sensing signals of the sensors arranged on the damper part to drive the controllable oil film system 5 and the magnetorheological damper 9 to work: 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 bearing 2 from having excessive displacement.

[0035] Among them, the sensors can be acceleration sensors, velocity sensors or displacement sensors. Each sensor is arranged along the X, Y, and Z directions on the top surface of the lower slide plate 7 and the top surface of the mass block 1. Each sensor is connected to the servo control system 10 through wired or wireless transmission.

[0036] Small vibration control section

[0037] 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 vibration frequency of the mass block 1 under small-amplitude vibration to improve the two-way 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, and further change 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 bearing 2 to achieve the semi-active adjustment of the frequency and damping of the tuned mass damper and improve the vibration reduction effect.

[0038] Large vibration control section

[0039] The large-amplitude vibration control part includes: a variable-curvature sliding surface 4, a controllable oil film system 5, a buffer collision limiting block 6, a bracket 8, a magnetorheological damper 9, and high-strength steel strands 11. The curvature radius of the variable-curvature sliding surface 4 is smaller than that of the constant-curvature sliding surface 3 to control the stroke of the mass block 1 under large-amplitude vibration, so as to ensure that the mass block 1 does not rush out of the arc-shaped sliding surface of the friction pendulum bearing 2 under large-amplitude vibration. 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 limiting block 6 is used to limit the mass block 1 so that the mass block 1 will slide together with the friction pendulum bearing 2 on the lower slide plate 7 under large-amplitude vibration. The magnetorheological damper 9 can improve the energy dissipation and shock absorption effect of the damper and prevent the friction pendulum bearing 2 from generating excessive displacement under the drive of the servo control system 10. The high-strength steel strands 11 are used for limiting to prevent the mass block 1 and the friction pendulum bearing 2 sliding together from having an excessive stroke.

[0040] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any change or modification made by any ordinary person skilled in the art according to the technical content disclosed above shall be regarded as an equivalent effective embodiment and 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, Including: a mass block (1), a friction pendulum bearing (2), a lower slide plate (7) and a servo control system (10), wherein the lower slide plate (7) is connected to the floor of the building structure by bolts or welding, the friction pendulum bearing (2) is placed on the lower slide plate (7) and can slide smoothly in two directions on the lower slide plate (7), the friction pendulum bearing (2) has a downward 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 outward from the center of the friction pendulum bearing (2), the variable curvature sliding surface (4) is an annular area concentric with the constant curvature sliding surface (3) and arranged outside the constant curvature sliding surface (3), the curvature radius of the variable curvature sliding surface (4) gradually decreases outward from the junction with the constant curvature sliding surface (3), the mass block (1) is placed on the arc-shaped sliding surface of the friction pendulum bearing (2) and can slide smoothly in two directions on the arc-shaped sliding surface, a buffer collision limiting block (6) is connected to the outer edge of the friction pendulum bearing (2) by bolts or welding to limit the mass block (1), a bracket (8) is connected to the lower slide plate (7) by bolts or welding, a high-strength steel strand (11) passes through a magnetorheological damper (9), and both ends of the high-strength steel strand (11) are clamped to the bracket (8) and the friction pendulum bearing (2) respectively through reserved fasteners; Wherein: the mass block (1), the friction pendulum bearing (2) and the lower slide plate (7) form the 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 the servo control part of the semi-active tuned mass damper, and the servo control system (10) analyzes and processes the sensing signals of the sensors arranged on the damper part to drive the controllable oil film system (5) and the magnetorheological damper (9) to work: 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); the constant curvature sliding surface (3) and the controllable oil film system (5) form the 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 vibration frequency of the mass block (1) under small-amplitude vibration so as to improve the two-way 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 limiting block (6), the bracket (8), the magnetorheological damper (9) and the high-strength steel strand (11) form the large-amplitude vibration control part of the semi-active tuned mass damper. The curvature radius of the variable-curvature sliding surface (4) is smaller than that of the constant-curvature sliding surface (3) to control the stroke of the mass block (1) under large-amplitude vibration, so as to ensure that the mass block (1) will not rush out of the arc sliding surface of the friction pendulum support (2) under large-amplitude vibration. 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 limiting 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 sliding plate (7) under large-amplitude 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 for limiting to prevent the mass block (1) and the friction pendulum support (2) that slide together from having an excessive stroke.

2. The semi-active tuned mass damper according to claim 1, wherein: The curvature radius of the constant-curvature sliding surface (3) is a constant value within 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.

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

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

5. The semi-active tuned mass damper according to claim 1, characterized in that: The sensors are acceleration sensors, velocity sensors or displacement sensors.

6. The semi-active tuned mass damper according to claim 1, wherein: The sensors are connected to the servo control system (10) through wired or wireless transmission.

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

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