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Ultra-low frequency pendulum tuned mass damper and its realization method

A technology for tuning mass damping and implementation methods, which can be applied to building components, earthquake resistance, etc., and can solve problems such as inability to apply pendulum TMD, difficulty in quantitative adjustment, and large installation space

Active Publication Date: 2016-02-17
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent is only applicable to the vertical TMD vibration damping device, and cannot be applied to the pendulum TMD that suppresses the horizontal vibration of towering structures, and the adjustment of the damping size is realized by changing the shape of the ball, which is difficult to achieve quantitative adjustment
[0006] In summary, it can be seen that the pendulum TMD required for vibration reduction of tall buildings requires a relatively large pendulum length and requires a huge installation space

Method used

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  • Ultra-low frequency pendulum tuned mass damper and its realization method
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  • Ultra-low frequency pendulum tuned mass damper and its realization method

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Embodiment 1

[0050] Embodiment one: see figure 1 , an ultra-low frequency pendulum tuned mass damper, comprising a pendulum chamber 9 arranged in a structure, a sling 1 connected to the structure at the top of the pendulum chamber 9, a quality block 2 suspended at the lower end of the sling 1, and The viscous damper 4 and the negative stiffness adjustment device between the mass block 2 and the structure, the number of the viscous damper 4 and the negative stiffness adjustment device are two and are on both sides corresponding to the mass block 2 Arranged symmetrically, the negative stiffness adjustment device includes n pieces of permanent magnets 3 arranged on one side of the mass block 2 with a polarity of N pole / S pole, and n pieces of poles arranged on the corresponding structure of the side The permanent magnet 3 is S pole / N pole, and the permanent magnets 3 on both sides of the mass block 2 are cylindrical permanent magnets.

Embodiment 2

[0051] Embodiment 2: This embodiment is a realization method of the ultra-low frequency pendulum-type tuned mass damper described in Embodiment 1.

[0052] At first the working principle of the present invention is set forth:

[0053] (1) by Figure 1-Figure 3 As shown, when the structure is stationary, the negative stiffness adjustment devices on the left and right sides of the mass block of the tuned mass damper balance each other, and the mass block is in a balanced state;

[0054] (2) When the structure vibrates, the pendulum of the tuned mass damper also swings accordingly, as Figure 4 As shown, when the pendulum swings to the left at an angle θ (θ1 ≥F 2 , the differential equation of motion mlθ″+p(θ)=0, p(θ) is the restoring force dependent on the swing angle θ:

[0055] p(θ)=mgsinθ-(F 1 cosθ-F 2 cosθ)

[0056] Because the angle θ is very small (within 5 degrees), approximately taking sinθ≈θ and cosθ≈1, we can get:

[0057] p(θ)≈mgθ-(F 1 -F 2 )①

[0058] in

...

Embodiment 3

[0107] Embodiment Three: Taking the wind-induced vibration damping design of Taiwan 101 Building as an example, the structure and design method of the present invention are adopted: the specific parameters of the pendulum-type tuned mass damper designed for wind-induced vibration damping of Taiwan 101 Building in China: mass m TMD is 660 tons, frequency f TMD 0.147Hz, pendulum length l i =11.5m, TMD design amplitude A=0.80m.

[0108] Pick Determine the pendulum length target adjustment value l=8.7m, and use the frequency adjustment method provided by this patent to optimize the final result: the distance d when the permanent magnet is in a balanced position 0 =0.79m, model N38 is required, 128 groups of circular permanent magnets with a size of D150×10mm (256 groups on both sides of the mass block, a total of 512 permanent magnets, the total mass is about 678kg, and the required cost is about 200,000). At this time, the calculation corresponds to Meets the design goal of...

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Abstract

The invention belongs to the technical field of structure vibration control and discloses an ultralow frequency swinging type tuning mass damper and an achieving method thereof. The novel tuning mass damper is formed through an added negative stiffness adjusting device with a novel structure, meanwhile, the achieving method of the tuning mass damper is disclosed, accordingly the swinging length of the ultralow frequency swinging type tuning mass damper (TMD) can be effectively shortened, the mounting space of the TMD is decreased, and the engineering application range of the ultralow frequency swinging type TMD is expanded.

Description

technical field [0001] The invention belongs to the technical field of structural vibration control, and in particular relates to an ultra-low frequency pendulum-type tuned mass damper and a realization method thereof. Background technique [0002] Tall buildings are prone to low-frequency and large-scale vibrations under wind loads. In order to suppress such structural vibrations, many super high-rise buildings are equipped with giant pendulum-type tuned mass dampers (TMD). According to the frequency calculation formula of pendulum TMD It can be seen that in order to meet the ultra-low frequency (the first-order bending vibration frequency is generally 0.1-0.2 Hz) vibration reduction requirements for super high-rise vibration reduction, the pendulum TMD often needs a larger pendulum length. For example, the TMD used in Taiwan 101 Building for wind vibration and seismic response control uses 8 sets of high-strength steel cables with a length of 11.5m and a diameter of 90mm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/98
Inventor 汪志昊李晓克陈爱玖刘云吴泽玉郜辉刘飞张闯皇幼坤王丽娟
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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