A mass block suitable for a tuned mass damper of a sea-crossing bridge

Abstract

The utility model discloses a mass block suitable for the tuned mass damper of cross-sea bridge, it includes the mass block body of inside hollow, the inside hollow inside filling has counterweight of mass block body, and mass block body includes the front end body and rear end body of being connected, and the front end body is hemispherical shell, and the rear end body is streamline shell, the utility model discloses under the sea current impact, and the front end body is located upstream and first receives the impact, and the rear end body is located downstream and rear end body is streamline and can destroy tail flow field, dissipate impact energy, reduce the water flow resistance that mass block whole received, effectively improve mass block stress performance.

Description

Technical Field

[0001] This utility model relates to the field of cross-sea bridge engineering technology, specifically to a mass block suitable for a tuned mass damper for cross-sea bridges. Background Technology

[0002] Vortex-induced vibration (VID) is a challenging engineering problem for cross-sea bridges based on pile groups and abutments. This vibration can cause fatigue damage to the underwater structure (piles), potentially leading to the failure of the entire bridge. This not only results in significant economic losses but also severe pollution of the marine environment. Currently, tuned mass dampers are commonly used in engineering to effectively suppress VID. The mass block, as a crucial component of the tuned mass damper, has a vital influence on its vibration reduction effect through its shape design.

[0003] A well-designed mass block shape can optimize its interaction with the surrounding fluid, reduce the current resistance experienced by the tuned mass damper, improve its vibration reduction efficiency, and enhance its reliability. However, existing mass block designs still have some shortcomings in practical applications. For example, some tuned mass dampers use spherical mass blocks, whose shape design does not conform to fluid dynamics. This results in excessive current resistance in marine environments, severely limiting the performance of the tuned mass damper. Therefore, developing a novel mass block that reduces current resistance is of significant practical importance for improving the performance of tuned mass dampers for cross-sea bridges. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this utility model provides a mass block suitable for tuned mass dampers of cross-sea bridges, solving the problem that existing spherical mass blocks suffer excessive water flow resistance in marine environments.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A mass block suitable for a tuned mass damper for a cross-sea bridge is provided, comprising a hollow mass block body; the hollow mass block body is filled with counterweights, and the mass block body includes a front end body and a rear end body connected together; the front end body is a hemispherical shell, and the rear end body is a streamlined shell.

[0006] Under the impact of ocean currents, the front end of the mass block is located upstream and is impacted first, while the rear end is located downstream and is streamlined, which can disrupt the tail flow field, dissipate impact energy, reduce the overall water flow resistance of the mass block, and effectively improve the stress performance of the mass block.

[0007] Furthermore, the radius of the longitudinal section of the front end body of the hemispherical shell is r, and the included angle is 260°.

[0008] Furthermore, the outer side of the longitudinal section of the rear end of the streamlined shell is an circumscribed arc with a radius of R = 3.15r.

[0009] Furthermore, the cross-section of the mass block body is elliptical, with a major axis length of 2r and a minor axis length of 2a = 0.6r.

[0010] Furthermore, the mass block body is provided with multiple fixed threaded holes.

[0011] This utility model discloses a mass block suitable for tuned mass dampers of cross-sea bridges, and its beneficial effects are as follows: Under the impact of ocean currents, the front end of the mass block is located upstream and is impacted first, while the rear end is located downstream and is streamlined, which can disrupt the tail flow field, dissipate impact energy, reduce the overall water flow resistance of the mass block, and effectively improve the stress performance of the mass block.

[0012] This invention reduces the water flow resistance of the mass block while ensuring that the mass block's mass remains constant, thereby improving the working efficiency and durability of the tuned mass damper. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a mass block suitable for a tuned mass damper for cross-sea bridges according to the present invention.

[0014] Figure 2 This is a schematic diagram of the internal structure of a mass block suitable for a tuned mass damper for cross-sea bridges according to the present invention.

[0015] Figure 3 This is a vertical cross-sectional view of the mass block body of this utility model.

[0016] Figure 4 This is a cross-sectional schematic diagram of the mass block body of this utility model.

[0017] Figure 5 This is a schematic diagram of the working state of this utility model.

[0018] Figure 6 This is a time history curve of the resistance coefficient of three types of mass blocks under the working speed U1 of this utility model.

[0019] Figure 7 This is a time history curve of the resistance coefficient of three types of mass blocks under the working speed U2 of this utility model.

[0020] Figure 8 This is a time history curve of the resistance coefficient of three types of mass blocks under the working speed U3 of this utility model.

[0021] The components are: 1. Front-end body; 2. Rear-end body; 3. Fixed threaded hole; 4. Mass block body; 5. Tuned mass damper crossbeam; 6. Tuned mass damper vertical rod; 7. Subsea pipeline. Detailed Implementation The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0022] Example 1 refer to Figures 1-8 This embodiment provides a mass block suitable for tuned mass dampers of cross-sea bridges. Its purpose is to solve the problem that existing spherical mass blocks will suffer excessive water flow resistance in marine environments. The specific structure of this embodiment will be described in detail below.

[0023] A mass block suitable for a tuned mass damper for a cross-sea bridge includes a hollow mass block body 4, the hollow interior of which is filled with counterweights.

[0024] The mass block body 4 includes a front body 1 and a rear body 2 connected together; the front body 1 is a hemispherical shell and the rear body 2 is a streamlined shell.

[0025] Specifically, the radius of the longitudinal section of the front body 1 of the hemispherical shell is r, and its included angle is 260°. The outer side of the longitudinal section of the rear body 2 of the streamlined shell is a circumscribed arc with a radius of R = 3.15r. The cross section of the mass block body 4 is elliptical, with a major axis length of 2r and a minor axis length of 2a = 0.6r.

[0026] Specifically, multiple fixed threaded holes 3 are provided through the mass block body 4.

[0027] In this embodiment, the mass block body 4 is hollow inside. The hollow interior can be counterweighted by adding iron sand or the like. The specific weight can be adjusted according to the weight of the mass block and the actual engineering environment to meet the actual engineering needs.

[0028] refer to Figure 5 In practical applications, the mass block body 4 is movably mounted on the tuned mass damper beam 5 through the fixed threaded hole 3. The tuned mass damper beam 5 is mounted on the subsea pipeline 7 through the tuned mass damper vertical rod 6. The position of the mass block body 4 on the tuned mass damper beam 5 can be adjusted according to the needs of the natural frequency.

[0029] The longitudinal section of the front body 1 of the hemispherical shell is semicircular with radius r, and the included angle of the semicircle can be 180°-300°, preferably 260°.

[0030] Thus, under the impact of ocean currents, the front body 1, located upstream, is the first to be impacted, while the rear body 2, located downstream and streamlined, can disrupt the tail flow field, dissipate impact energy, reduce the overall water flow resistance of the mass block, and effectively improve the stress performance of the mass block.

[0031] This invention reduces the water flow resistance of the mass block while ensuring that the mass block's mass remains constant, thereby improving the working efficiency and durability of the tuned mass damper.

[0032] The drag coefficient is a dimensionless quantity in fluid mechanics, defined as follows: C d = F x / (qS), where F x q represents drag; S represents dynamic pressure; and S represents the reference area. Through numerical simulation, the drag coefficients of commonly used tuned mass dampers for spherical and cubical mass blocks, as well as this invention, were obtained under common operating flow velocities (U1, U2, U3). This demonstrates the drag reduction performance of this invention. See reference [link / reference]. Figures 6-8 .

[0033] This invention effectively reduces the water flow resistance of the mass block in the working environment by optimizing the shape design of the rear end of the mass block shell. The resistance coefficient is reduced from 0.55 for traditional spherical mass blocks to 0.45. This allows for better dissipation of impact energy and improves the working efficiency of the tuned mass damper. While reducing water flow resistance, it also reduces fatigue damage to the tuned mass damper, extending its service life. It is applicable to all threaded tuned mass dampers, and the process is simple, making it easy to manufacture and install.

[0034] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A mass block suitable for a tuned mass damper of a cross-sea bridge, characterized in that: Includes a hollow mass block body (4); the hollow interior of the mass block body (4) is filled with counterweights; The mass block body (4) includes a front end body (1) and a rear end body (2) connected together; the front end body (1) is a hemispherical shell and the rear end body (2) is a streamlined shell.

2. The mass block suitable for a tuned mass damper for a cross-sea bridge according to claim 1, characterized in that: The radius of the longitudinal section of the front body (1) of the hemispherical shell is r, and the included angle is 260°.

3. The mass block suitable for a tuned mass damper for a cross-sea bridge according to claim 2, characterized in that: The outer side of the longitudinal section of the streamlined shell's rear end body (2) is an circumscribed arc with a radius of R = 3.15r.

4. The mass block suitable for a tuned mass damper for a cross-sea bridge according to claim 2, characterized in that: The cross section of the mass block body (4) is elliptical, with a major axis length of 2r and a minor axis length of 2a = 0.6r.

5. The mass block for a tuned mass damper for a cross-sea bridge according to claim 1, characterized in that: Multiple fixed threaded holes (3) are provided through the main body (4) of the mass block.

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