Support structure for anti-sway of closed bus of floating power station and floating power station

Abstract

The application belongs to the field of anti-shaking structure design of closed bus, and provides a support structure for anti-shaking of closed bus of floating power station and the floating power station. The support structure comprises a support steel structure and a vibration isolator arranged between the out-of-phase closed bus and the support steel structure. The ratio of the vibration frequency to the natural frequency of the vibration isolator is at least 2. The load required to be borne by each support point of the closed bus is within the rated load range of the vibration isolator. The vibration isolator is arranged at the support connection between the out-of-phase closed bus and the steel structure, and the deformation amount of the ship body caused by the ship swing is absorbed through the damping function of the vibration isolator, so that the axial pressure and the lateral pressure can achieve good damping effect, thereby reducing the transmission of vibration.

Description

Technical Field

[0001] This invention belongs to the field of anti-sway structure design for enclosed busbars, and particularly relates to a support structure for anti-sway of enclosed busbars in floating power plants and a floating power plant. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] The floating power generation equipment is installed on the steel deck of the floating vessel and should be designed for both offshore and near-shore applications to ensure reliable and safe operation under maritime conditions. The equipment should meet the demands of ship motion during operation and shutdown and should not be damaged under extreme conditions. The generator outlet busbar is a fully connected, phase-separated enclosed busbar. Each phase consists of a single-phase conductor and a circular metal casing. The metal casings of three-phase conductors are connected by short-circuit plates. The conductors are made of copper busbars, and the casings are made of bent thin aluminum sheets. The phase-separated enclosed busbar is suspended or supported and fixedly installed on the power generation vessel. The suspended or supported steel structure support consists of multiple supported spatial frames, with horizontal and vertical supports arranged according to the orientation of the enclosed busbar and load requirements. The steel columns, steel frame structural beams, and inter-column supports all use H-beams.

[0004] Conventional land-based projects, such as Figure 1 As shown, the connection between the enclosed busbar 1 and the support steel structure 2 is a direct weld, a rigid connection. Floating power generation vessels, operating in a marine environment, are subject to the influence of waves, winds, and ocean currents, making it difficult to maintain a stable spatial attitude. This leads to hull deformation, inevitably interfering with the strength load borne by the enclosed busbar support foundation. The inventors discovered that the rigid connection between the enclosed busbar and the steel structure support cannot absorb the hull deformation caused by the power generation vessel's swaying, lacking vibration isolation and absorption characteristics. This results in vibration of the enclosed busbar, leading to a reduction in equipment quality and affecting safe and stable operation. The unbalanced disturbance force generated during equipment swaying can also cause dynamic fatigue and stress concentration in the structure, potentially leading to localized dynamic instability and localized damage. Summary of the Invention

[0005] To address the technical problems mentioned above, this invention provides a support structure for anti-swaying of the enclosed busbar of a floating power station and a floating power station. Vibration isolators are installed at the connection between the enclosed busbar and the steel structure support. Through the vibration reduction function of the vibration isolators, the deformation of the hull caused by the swaying of the ship is absorbed, achieving a good vibration reduction effect under axial and lateral pressure, thereby reducing the transmission of vibration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a support structure for resisting swaying of enclosed busbars in floating power plants.

[0008] A support structure for sway prevention of enclosed busbars in floating power plants includes: a support steel structure and a vibration isolator disposed between the phase-separated enclosed busbar and the support steel structure; wherein the ratio of the vibration frequency of the vibration isolator to its natural frequency is at least [value missing]. The load that each support point of the enclosed busbar needs to withstand is within the rated load range of the vibration isolator.

[0009] As one implementation method, the process for determining the vibration frequency of the vibration isolator is as follows:

[0010] Under wet towing conditions, based on the sway acceleration values ​​at various positions of the floating power generation vessel, and using the finite element model of the phase-separated closed busbar and support steel structure, the random vibration of the phase-separated closed busbar and support steel structure is simulated by finite element analysis, thereby determining the vibration frequency of the vibration isolator.

[0011] As one implementation method, the construction process of the finite element model of the phase-separated closed busbar and the finite element model of the support steel structure is as follows:

[0012] Based on the arrangement, mass, and dimensional parameters of the phase-separated enclosed busbar, as well as the dimensional parameters of the support steel structure, finite element models of the phase-separated enclosed busbar and the support steel structure are constructed using the finite element analysis method.

[0013] As one implementation method, the process for determining the rated load of the vibration isolator is as follows:

[0014] Based on the routing and equipment parameters of the enclosed busbar, the steel structure load at each support point of the enclosed busbar is obtained, thereby determining the rated load of the vibration isolator.

[0015] In one embodiment, the vibration isolator includes an isolator body, a base, and a cover, with the isolator body disposed between the base and the cover.

[0016] In one implementation, the vibration isolator body is a rubber structure.

[0017] In one implementation, the vibration isolator body is an elastic structure.

[0018] As one implementation method, the vibration isolators between the phase-separated closed busbar and each support steel structure have the same performance.

[0019] A second aspect of the present invention provides a floating power station.

[0020] A floating power station includes a floating power generation hull, on which a support structure for resisting swaying of the enclosed busbar of the floating power station as described above is provided.

[0021] In one embodiment, the floating power generation vessel is equipped with power generation equipment and power transformation equipment, and the power generation equipment is connected to the power transformation equipment via an enclosed busbar.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention installs vibration isolators at the connection between the phase-separated enclosed busbar and the steel structure support. Through the vibration reduction function of the vibration isolators, the hull deformation caused by the ship's swaying is absorbed, achieving a good vibration reduction effect under axial and lateral pressure, thereby reducing the transmission of vibration.

[0024] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 It is an existing enclosed busbar support structure;

[0027] Figure 2 This is a front view of the closed busbar anti-sway support structure according to an embodiment of the present invention;

[0028] Figure 3 This is a top view of the closed busbar anti-sway support structure according to an embodiment of the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Example 1

[0033] like Figures 2-3 As shown, this embodiment provides a support structure for anti-swaying of the enclosed busbar in a floating power station, comprising: a support steel structure 2 and a vibration isolator 3 disposed between the phase-separated enclosed busbar 1 and the support steel structure 2; wherein the ratio of the vibration frequency of the vibration isolator 3 to its natural frequency is at least [value missing]. The load that each support point of the enclosed busbar 1 needs to bear is within the rated load range of the vibration isolator 3.

[0034] In the specific implementation process, the process of determining the vibration frequency of the vibration isolator is as follows:

[0035] Under wet towing conditions, based on the sway acceleration values ​​at various positions of the floating power generation vessel, and using the finite element model of the phase-separated closed busbar and support steel structure, the random vibration of the phase-separated closed busbar and support steel structure is simulated by finite element analysis, thereby determining the vibration frequency of the vibration isolator.

[0036] The construction process of the finite element model of the phase-separated closed busbar and the finite element model of the support steel structure is as follows:

[0037] Based on the arrangement, mass, and dimensional parameters of the phase-separated enclosed busbar, as well as the dimensional parameters of the support steel structure, finite element models of the phase-separated enclosed busbar and the support steel structure are constructed using the finite element analysis method.

[0038] In the specific implementation process, the process for determining the rated load of the vibration isolator is as follows:

[0039] Based on the routing and equipment parameters of the enclosed busbar, the steel structure load at each support point of the enclosed busbar is obtained, thereby determining the rated load of the vibration isolator.

[0040] Among them, the vibration isolators between the phase-separated closed busbar and each support steel structure have the same performance.

[0041] The vibration isolator in this embodiment includes an isolator body, a base, and a cover, with the isolator body disposed between the base and the cover.

[0042] This embodiment establishes a closed busbar and steel structure support model, uses finite element simulation to conduct random vibration analysis, and proposes a vibration reduction measure by setting rubber vibration isolators at the connection between the closed busbar and the steel structure support. Through the vibration reduction function of the vibration isolators, the hull deformation caused by the ship's swaying is absorbed, and a good vibration reduction effect can be achieved in both axial and lateral pressure, thereby reducing the transmission of vibration.

[0043] Vibration isolation, or simply vibration isolation, is one of the important ways to eliminate vibration hazards. Based on the direction of vibration transmission, vibration isolation can be divided into two categories: active vibration isolation and passive vibration isolation. The former reduces vibration caused by object disturbance, aiming to isolate the vibration source from the foundation; the latter reduces vibration caused by foundation movement, aiming to isolate the response.

[0044] It should be noted that the vibration isolator body is a rubber structure, while in other embodiments, the vibration isolator body is an elastic structure.

[0045] In this embodiment, rubber vibration isolators are placed between the enclosed busbar and the steel structure foundation as elastic supports. By selecting appropriate parameters, vibration reduction is achieved, absorbing the vibration effects of the ship's pitching, rolling, or turbulence, and protecting the enclosed busbar for stable operation in complex environments.

[0046] (1) Finite element model

[0047] First, based on the layout diagram of the phase-separated enclosed busbar, the steel structure diagram of the support, the equipment control report and the equipment installation diagram of this project, a finite element model of the enclosed busbar and support structure is established.

[0048] Table 1 Parameters required for establishing the mathematical model

[0049]

[0050] Taking the enclosed busbar of the No. 1 gas turbine generator as an example:

[0051] (2) Equipment load

[0052] The steel structure material used for the phase-separated enclosed busbar support is Q235B, with a hot-dip galvanized surface. The mechanical properties of the steel meet the requirements of the national standard GB / T700-2006.

[0053] The main load on the steel structure of this project comes from the enclosed busbars. The specifications and weights of the enclosed busbars are as follows:

[0054] Table 2 Main Circuit Busbar Data Table

[0055]

[0056] Table 3 Branch Circuit Busbar Data Table

[0057]

[0058] Based on the layout diagram and equipment data sheet of the enclosed busbar, the steel structure loads at each support point of the enclosed busbar are obtained, as shown in the table below:

[0059] Table 4. Weight of each steel structure support for the enclosed busbar support of gas turbine #1

[0060]

[0061] (3) Swaying condition of the power generation ship

[0062] Based on the sway acceleration values ​​at various positions of the hull, the enclosed busbar support structure at the same position of the entire power generation vessel has the greatest sway acceleration under wet towing conditions. Therefore, the calculation conditions can be considered based on the wet towing conditions.

[0063] Table 5. Shaking acceleration values ​​at various points on the busbar support

[0064]

[0065] The maximum acceleration of the enclosed busbar support for the No. 1 gas turbine generator output line is at the 26.5-meter elevation level. Although the acceleration values ​​at different locations within this level are different, the following maximum value is uniformly taken in the actual calculation process.

[0066] Table 6. Swaying Acceleration Used in Calculations for Enclosed Busbar Supports

[0067]

[0068] (4) Rubber vibration isolators

[0069] Rubber vibration isolators are placed between the enclosed busbar and the supporting steel structure as elastic supports. The isolator base and cover are connected by threads, clamping the rubber in between. Bolt holes in the isolator base are used to fix the isolator to the enclosed busbar support. The enclosed busbar is installed on top of the isolator, with its base mounting holes passing through the isolator's shaft and pressing against the cover. When the isolator is subjected to compressive loads during operation, the rubber block between the cover and base is compressed. The rubber's strong elasticity achieves vibration reduction.

[0070] Based on the attenuation index used to evaluate the vibration isolation effect, the following two principles apply to the selection of vibration isolators.

[0071] (1) Select an appropriate frequency ratio To achieve the best vibration isolation effect, among which, f It is the vibration frequency. f n The natural frequency of the elastic support must be selected to meet certain requirements. ≥ The conditions for vibration isolation are as follows: As the frequency ratio increases, the transmission system becomes smaller, and the vibration isolation effect is better; however, the frequency ratio should not be too large, because if it is too large, the vibration isolator must be very flexible, with large static deflection, large size, poor stability, and easy shaking. Therefore, a frequency ratio between 2.5 and 4.5 is generally selected, with a vibration isolation efficiency of approximately 70% to 95%.

[0072] (2) The load must be within the rated load range of the vibration isolator, and the tolerance is generally 5% to 10%.

[0073] Installation and layout requirements for vibration isolators: ① Vibration isolators of the same model should be used as much as possible in the same vibration isolation system; ② The stress on each vibration isolator should be uniform, and the static compression should be basically consistent; ③ The support surface area should be maximized; ④ The vibration isolators should be evenly distributed when calculating the load distribution; ⑤ They should not be installed in the direction that puts tension on the bonding surface between the rubber and metal parts of the vibration isolator. In this project, vibration isolators of the same model and specification are installed at each steel structure support point of the enclosed busbar support.

[0074] Based on the loads at each steel structure support point of the enclosed busbar support and the acceleration values ​​under wet drag conditions, this project selected the JNH12543 bell-shaped shock absorber. Its tensile and compressive strength is 740 kg, its compressive deformation is 4 mm, and its structural materials are corrosion-resistant, making it suitable for use in marine environments such as seawater spray and humidity. The device features internal rubber and iron components fully bonded together, providing excellent vibration damping. Furthermore, it is equipped with safety lock components to ensure safe and stable operation.

[0075] (5) Analysis of the sway of the enclosed busbar

[0076] Because the hull's swaying is periodic, the force loads acting on the steel structure are also periodic. Therefore, harmonic response analysis is used for the stress analysis of the steel structure to determine the steady-state response of the enclosed busbar as it changes with the hull's swaying. Based on the results of the harmonic response analysis, the vibration isolation efficiency of each support point of the #1 gas turbine enclosed busbar support is obtained. See the table below:

[0077] Table 7 Vibration isolation efficiency of each support point of the enclosed busbar

[0078]

[0079] As can be seen from the above analysis, rubber vibration isolators are placed between the enclosed busbar and the steel structure support as elastic supports. With reasonable parameter selection and reasonable installation, they can achieve a vibration reduction effect of 70% to 95%, absorb the vibration deformation caused by the ship's pitching, rolling or turbulence, and protect the enclosed busbar for stable operation in complex environments.

[0080] With the increasing installed capacity of offshore platforms, the application of isolated enclosed busbars will become more and more widespread. Offshore platforms operate in a marine environment for extended periods, and are subject to the influence of waves, winds, and ocean currents, making it difficult to maintain a stable spatial attitude. This can interfere with the strength loads and operating conditions of the enclosed busbars, affecting their safety performance. By adding rubber vibration isolators between the enclosed busbars and the steel structure supports as elastic supports, the traditional rigid connection is changed. The vibration isolators absorb the vibration deformation caused by the ship's trim, roll, or pitching, protecting the safe and stable operation of the enclosed busbars.

[0081] Example 2

[0082] This embodiment provides a floating power station, which includes a floating power generation hull, and the floating power generation hull is provided with a support structure as described above for anti-swaying of the enclosed busbar of the floating power station.

[0083] The floating power generation vessel is equipped with power generation equipment and power transformation equipment, and the power generation equipment is connected to the power transformation equipment through an enclosed busbar.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A support structure for resisting swaying of enclosed busbars in floating power plants, characterized in that, include: Support steel structure and vibration isolators installed between the phase-separated enclosed busbar and the support steel structure; Wherein, the ratio of the vibration frequency of the vibration isolator to its natural frequency is at least 1. The process for determining the vibration frequency of the vibration isolator is as follows: Under wet towing conditions, based on the swaying acceleration values ​​at various positions of the floating power generation vessel, and using the finite element model of the phase-separated closed busbar and the support steel structure, finite element analysis is employed to simulate the random vibration of the phase-separated closed busbar and the support steel structure, thereby determining the vibration frequency of the vibration isolator. The load that each support point of the enclosed busbar needs to bear is within the rated load range of the vibration isolator. The process of determining the rated load of the vibration isolator is as follows: based on the route layout of the enclosed busbar and the equipment parameters, the steel structure load of each support point of the enclosed busbar is obtained, thereby determining the rated load of the vibration isolator.

2. The support structure for anti-swaying of enclosed busbars in floating power plants as described in claim 1, characterized in that, The construction process of the finite element model of the phase-separated closed busbar and the finite element model of the support steel structure is as follows: Based on the arrangement, mass, and dimensional parameters of the phase-separated enclosed busbar, as well as the dimensional parameters of the support steel structure, finite element models of the phase-separated enclosed busbar and the support steel structure are constructed using the finite element analysis method.

3. The support structure for anti-swaying of enclosed busbars in floating power plants as described in claim 1, characterized in that, The vibration isolator includes an isolator body, a base, and a cover, with the isolator body disposed between the base and the cover.

4. The support structure for anti-swaying of enclosed busbars in floating power plants as described in claim 3, characterized in that, The vibration isolator body is a rubber structure.

5. The support structure for anti-swaying of enclosed busbars in floating power plants as described in claim 3, characterized in that, The vibration isolator body is an elastic structure.

6. The support structure for anti-swaying of enclosed busbars in floating power plants as described in claim 1, characterized in that, The vibration isolators between the phase-separated enclosed busbar and each support steel structure have the same performance.

7. A floating power station, characterized in that, The device includes a floating power generation vessel hull, on which a support structure for resisting swaying of the enclosed busbar of a floating power station as described in any one of claims 1-6 is provided.

8. The floating power station as described in claim 7, characterized in that, The floating power generation vessel is equipped with power generation equipment and power transformation equipment, and the power generation equipment is connected to the power transformation equipment through an enclosed busbar.

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