CN-117071772-B - TMD group vibration control method under low-frequency wind vibration of large-span floor system

Abstract

The invention discloses a TMD group vibration control technology under low-frequency wind vibration of a large-span floor, which comprises 1) enabling the large-span floor to generate a multi-stage easy-excitation mode under the action of low-frequency pulsation wind load, and 2) carrying out mode analysis and TMD group distributed arrangement on the large-span floor according to the mode analysis result, wherein the TMD comprises an upper cover plate (11), a lower cover plate (12), a plurality of supporting springs (13), a plurality of spring guide shafts (14) and a frequency modulation mass block (15), two ends of the spring guide shafts (14) are respectively arranged on the upper cover plate (11) and the lower cover plate (12), the frequency modulation mass block (15) passes through the spring guide shafts (14) and is arranged between the upper cover plate (11) and the lower cover plate (12), and the plurality of supporting springs (13) are respectively sleeved on the plurality of spring guide shafts (14) and are arranged below the frequency modulation mass block (15), so that the frequency modulation mass block (15) is supported.

Inventors

• Hu Mingdai
• HUANG WEI
• CUI QI
• LIANG XINQI
• TANG WEIJIAN
• Zhang Nantao
• WANG JINPEI
• WANG XIN

Assignees

• 国机集团科学技术研究院有限公司

Dates

Publication Date

20260512

Application Date

20230831

Claims (5)

1. 1. The TMD group vibration control method under the low-frequency wind vibration of the large-span floor system is characterized by comprising the following steps of: 1) Under the action of low-frequency pulsating wind load, the large-span floor system can generate multi-order easy-excitation mode and 2) Performing modal analysis, and performing TMD group distributed arrangement on the large-span floor system according to a modal analysis result; The TMD comprises an upper cover plate (11), a lower cover plate (12), a plurality of supporting springs (13), a plurality of spring guide shafts (14) and a frequency modulation mass block (15), wherein both ends of the spring guide shafts (14) are respectively arranged on the upper cover plate (11) and the lower cover plate (12), the frequency modulation mass block (15) passes through the spring guide shafts (14) and is arranged between the upper cover plate (11) and the lower cover plate (12), and the plurality of supporting springs (13) are respectively sleeved on the plurality of spring guide shafts (14) and are arranged below the frequency modulation mass block (15), so that the frequency modulation mass block (15) is supported; Step 2) includes determining easy-excitation modes and vibration mode participation coefficients thereof according to mode analysis, determining peak points and frequencies of the easy-excitation modes, determining arrangement positions and corresponding frequencies of corresponding distributed TMDs according to the peak points of the easy-excitation modes, and determining rigidity and quality of the TMDs according to the arrangement positions, the frequencies and the integral quality of a floor structure of each distributed TMD.
2. 2. The method for controlling the TMD group vibration under the low-frequency wind vibration of the large-span floor system according to claim 1, wherein the frequency modulation mass block (15) is a plurality of blocks.
3. 3. The method for controlling the TMD group vibration under the low-frequency wind vibration of the large-span floor system according to claim 1, wherein the ratio of the mass of the frequency modulation mass block (15) to the mass of the large-span floor system is μ, 0.01< μ <0.05.
4. 4. The method for controlling TMD group vibration under low-frequency wind vibration of a large-span floor system according to claim 1, wherein the modal analysis participation mass reaches 75% of the whole mass.
5. 5. The method for controlling the vibration of the TMD group under the low-frequency wind vibration of the large-span floor system according to claim 1, wherein the TMD is arranged after the construction of the large-span floor system by adopting a rear support type.

Description

TMD group vibration control method under low-frequency wind vibration of large-span floor system Technical Field The invention relates to the technical field of vibration control, in particular to a TMD (tuned mass damper) group vibration control method under low-frequency wind vibration of a large-span floor system. Background At present, aiming at the problem of vibration hazard of a large-span floor under the action of low-frequency pulsating wind load, the three schemes are generally adopted, namely 1) the large span is reduced to be small span, the rigidity is improved, and the influence of low-frequency vibration is reduced. 2) Increasing cross section or stiffness and reducing the effect of low frequency vibrations. 3) Local energy consuming struts are employed. However, the above solutions are not enough, for example, in the solution 1), since the project engineering can test large-scale equipment, if the large span is reduced to a small span, the loss of the lower space is caused, and the use space of the project is reduced. In the scheme 2), the section or the rigidity of the floor slab is increased, so that the quality of the floor slab can be greatly improved, the consumed materials are more, and the economic cost is huge. In scheme 3), viscous damper has better damping effect to wind-induced vibration, but along with arranging the quantity increase, can receive the mounted position influence, and the difficult regulation of local power consumption vibration damping support is maintained. Accordingly, new techniques and methods are needed to at least partially address the deficiencies in the prior art. Disclosure of Invention Therefore, the technology aims at the problem of vibration harmonic response amplification of a large-span floor structure under the action of low-frequency pulsating wind, adopts distributed TMD groups, saves space and is flexibly arranged in the large-span roof structure, and the TMD groups are optimally arranged by utilizing the mode-shape peak-to-peak points of the high-order mode analysis of the floor structure, so that the vibration of the large-span floor is controlled to meet the requirement. According to one aspect of the invention, a TMD group vibration control method under low-frequency wind vibration of a large-span floor system is provided, comprising the following steps: 1) Under the action of low-frequency pulsating wind load, the large-span floor system can generate multi-order easy-excitation mode and 2) Performing modal analysis, and performing TMD group distributed arrangement on the large-span floor system according to a modal analysis result; The TMD comprises an upper cover plate (11), a lower cover plate (12), a plurality of supporting springs (13), a plurality of spring guide shafts (14) and a frequency modulation mass block (15), wherein two ends of each spring guide shaft (14) are respectively arranged on the upper cover plate (11) and the lower cover plate (12), the frequency modulation mass block (15) passes through each spring guide shaft (14) and is arranged between the upper cover plate (11) and the lower cover plate (12), and the plurality of supporting springs (13) are respectively sleeved on the plurality of spring guide shafts (14) and are arranged below the frequency modulation mass block (15), so that the frequency modulation mass block (15) is supported. According to an embodiment of the invention, the frequency-modulating mass (15) is a plurality of blocks. According to an embodiment of the invention, wherein the ratio of the mass of the frequency-modulated mass (15) to the mass of the large-span floor is μ, 0.01< μ <0.05. According to an embodiment of the present invention, step 2) includes determining the easy-to-excite modes and their mode-shape participation coefficients according to the mode analysis, determining their peak-to-peak points and frequencies, determining the arrangement positions and the corresponding frequencies of the corresponding distributed TMDs from each easy-to-excite mode peak-to-peak point, and determining the rigidity and the quality of the TMDs from the arrangement point positions, the frequencies and the overall mass of the floor structure of each distributed TMD. According to an embodiment of the invention, wherein the modal analysis is engaged in mass up to 75% of the whole. According to an embodiment of the invention, the TMD is set after the construction of the large-span floor system using a rear support. The invention mainly aims at the problem of vibration hazard of a large-span floor structure under low-frequency pulsating wind load, and provides a multi-order modal analysis based on a floor, and a TMD damper group vibration control technology for reasonably arranging a large-scale TMD group: according to the TMD vibration reduction principle, the multi-order integral modes of the floor system are considered, the TMD groups are optimally arranged by utilizing the positions of the vibration mode pea