CN115901177A - Cylindrical FPSO platform vortex-induced motion water tank experimental device - Google Patents

Abstract

The invention provides a cylindrical FPSO platform vortex-induced motion water tank experimental device related to the technical field of ocean platform experimental devices, including a cylindrical FPSO platform model, an integral support mechanism, a horizontal sliding mechanism, an airflow generating mechanism, and a horizontal mooring mechanism And the yaw adjustment mechanism. The cylindrical FPSO platform model is connected with the airflow generating mechanism and the horizontal sliding mechanism through the yaw adjustment mechanism. The horizontal sliding mechanism is placed above the water tank through the overall support mechanism. The cylindrical FPSO platform model is immersed in water, the horizontal mooring mechanism is connected to the horizontal sliding mechanism, one end of the yaw adjustment mechanism is connected to the horizontal sliding mechanism, and the other end of the yaw adjustment mechanism is connected to the cylindrical FPSO platform model. The invention can simulate the vortex-induced motion of the cylindrical FPSO platform in a real force-bearing environment, and is convenient for setting up comparative experiments to study the mechanism of the influence of the yaw degree of freedom on the vortex-induced motion, and has a simple structure and convenient operation.

Description

Cylindrical FPSO platform vortex induced motion water tank experimental device

technical field

The invention relates to the technical field of ocean platform experimental devices, in particular to a cylindrical FPSO platform vortex-induced motion water tank experimental device.

Background technique

Floating production storage and offloading unit (FPSO) is an important equipment for the development of offshore oil and gas fields. The structure of traditional FPSO is mostly ship-type FPSO, which is positioned in the operating sea area by a single point mooring system. Ship-type FPSO is sensitive to environmental conditions, has poor motion performance (especially heave motion performance), and the supporting mooring system is expensive. In recent years, cylindrical FPSO, as a new type of offshore engineering equipment, also has multiple functions such as oil and gas production and processing, oil storage, export and living, and has been gradually applied to the development of global offshore oil and gas resources. The motion characteristics of the cylindrical FPSO are better than those of the ship-type FPSO, and the multi-point mooring system is used for positioning, which greatly reduces the construction cost. Cylindrical FPSO and other offshore platforms will produce vortex induced motion under the background of ocean currents, which will cause fatigue damage to the riser and mooring system. At present, there are few relevant studies on cylindrical FPSO, which is not conducive to the design and construction of structures with good motion performance. As an important research method in the field of ocean engineering, model test is of great significance to understand the hydrodynamic performance of ocean structures. Accurately simulating the stress of the real platform in the ocean environment is the key to improving the credibility of the experimental data.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide a cylindrical FPSO platform vortex-induced motion water tank experimental device, which can accurately simulate the vortex-induced motion of the ocean platform in a real stress environment.

According to the present invention, a cylindrical FPSO platform vortex-induced motion water tank experiment device includes a cylindrical FPSO platform model, an integral support mechanism, a horizontal sliding mechanism, an airflow generating mechanism, a horizontal mooring mechanism and a yaw adjustment mechanism. The cylindrical FPSO platform model is connected with the airflow generating mechanism and the horizontal sliding mechanism through the yaw adjustment mechanism. The horizontal sliding mechanism is placed above the water tank through the overall support mechanism, and the overall support mechanism is fixed on the top of the water tank. The cylindrical FPSO platform model is immersed in the In water, the horizontal mooring mechanism is connected to the horizontal sliding mechanism, one end of the yaw adjustment mechanism is connected to the horizontal sliding mechanism, and the other end of the yaw adjustment mechanism is connected to the cylindrical FPSO platform model.

Preferably, the airflow generating mechanism is embedded in the slider of the horizontal sliding mechanism.

Preferably, the yaw adjustment mechanism is installed on the central axis of the cylindrical FPSO platform model, and the yaw adjustment mechanism is connected with the slider of the horizontal slide mechanism.

Preferably, the cylindrical FPSO platform model includes a cylindrical FPSO platform model body, a central pillar and a support rod, the inner bottom of the cylindrical FPSO platform model body is connected to the center of the disc bottom of the central pillar, and the support rods are symmetrically connected Cylindrical FPSO platform model body and central pillar.

Preferably, the overall support mechanism includes a beam, a beam and a support beam, the beam is connected to the top of the tank, the beam is vertically connected to both sides of the beam, and a support beam is connected between the beams, the support beam is distributed along the flow direction of the tank, and the support beam is connected horizontally sliding mechanism.

Preferably, the horizontal sliding mechanism includes a slider and a linear track, and the slider slides on the linear track to drive the cylindrical FPSO platform model to perform vortex motion along the linear guide rail;

A small hole is arranged on the slide block, and the small hole is connected with the air bearing in the air flow generating mechanism.

Preferably, the air flow generating mechanism includes an air compressor, a compressed air air duct and an air bearing, the air bearing is connected to the slider, and the air bearing is connected to the external air compressor through the compressed air air duct, and the air bearing is connected to the linear Airflow gaps are created between the rail planes.

Preferably, the horizontal mooring mechanism includes a tension spring and a tension sensor, one end of the tension spring is connected to the slider, the other end of the tension spring is connected to the tension sensor, the tension sensor is connected to the linear track, the tension spring and the surface of the linear track are kept parallel, and the value of the tension sensor is obtained after After processing, the displacement response of the cylindrical FPSO platform model is obtained.

Preferably, the yaw adjustment mechanism includes limit pins, rolling bearings, snap rings, linear springs and inelastic connecting ropes. The limit pins are inserted into the slider through the openings of the central pillar to limit the degree of freedom of yaw. When the limit pins are pulled out To release the yaw freedom, the rolling bearing is fixed on the sliders on both sides through the snap ring. The central pillar of the cylindrical FPSO platform model is suspended above the water tank through the axis of the rolling bearing. One end of the linear spring is connected to the slider, and the other end of the linear spring is Connect the non-elastic connecting rope, the non-elastic connecting rope connects the center pillar, and the linear spring, the non-elastic connecting rope and the surface of the slider are kept parallel.

Compared with the prior art, the present invention has the following beneficial effects:

The invention can reduce the friction between the slider and the linear track through the air gap between the air bearing and the slider, and make the platform hardly receive the lateral force from the overall support device without restricting the horizontal movement of the platform model , which accurately simulates the vortex-induced motion of the cylindrical FPSO platform in a real stress environment, which improves the reliability of the experimental data; and facilitates the limitation or release of the yaw degree of freedom, and facilitates the impact of the yaw degree of freedom on the vortex-induced motion research; the whole experimental device is simple in structure and easy to operate.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the cylindrical FPSO platform model and the yaw adjustment mechanism of the present invention;

Fig. 3 is a schematic diagram of the horizontal sliding mechanism and the horizontal mooring mechanism of the present invention.

Labels in the figure:

Cylindrical FPSO platform model 1, cylindrical FPSO platform model body 11, central pillar 12, support rod 13, overall support mechanism 2, beam 21, beam material 22, support beam 23, horizontal sliding mechanism 3, slider 31, Linear track 32, airflow generating mechanism 4, air bearing 41, horizontal mooring mechanism 5, tension spring 51, tension sensor 52, yaw adjustment mechanism 6, limit pin 61, rolling bearing 62, snap ring 63, linear spring 64, No elastic connecting rope 65.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Example

A cylindrical FPSO platform vortex-induced motion water tank experimental device provided by the present invention, as shown in Figure 1-3, includes a cylindrical FPSO platform model 1, an integral support mechanism 2, a horizontal sliding mechanism 3, an airflow generating mechanism 4, The horizontal mooring mechanism 5 and the yaw adjustment mechanism 6; the cylindrical FPSO platform model 1 is connected with the horizontal sliding mechanism 3, and is horizontally mounted above the water tank through the integral support mechanism 2, and immersed in water to a suitable depth; the integral support mechanism 2 It is fixed on the top of the water tank; the horizontal sliding mechanism 3 is connected with the overall support mechanism 2; the airflow generating mechanism 4 is embedded in the slider 31 of the horizontal sliding mechanism 3, and connected with the external air compressor through the compressed air air duct; the horizontal mooring mechanism 3 One end is connected to the cylindrical FPSO platform model 1, and the other end is connected to the overall support mechanism 2; the yaw adjustment mechanism 6 is installed on the central axis 12 of the cylindrical FPSO platform model, 31 are connected.

The cylindrical FPSO platform model 1 includes a cylindrical FPSO platform model body 11, a central pillar 12 and a support rod 13; the inner bottom of the cylindrical FPSO platform model body 11 is coaxially connected with the disc bottom of the central pillar 12; The pillar 12 has a horizontal hole near the slider 31 for inserting the limit pin 61; a plurality of support rods 13 are radially and symmetrically distributed between the cylindrical FPSO platform model body 11 and the central pillar 12, and one end of the support rod 13 is Connect the central pillar 12, and the other end is connected with the inner wall of the cylindrical FPSO platform model body 11, which plays a role in supporting the cylindrical FPSO platform model 1 and prevents the roll during the movement.

The overall support mechanism 2 is a truss structure, which is fixed on the top of the water tank through two beams 21 in the truss, four beams 22 welded to the beams are perpendicular to the water surface, and flow along the water tank to two vertical beams 22 on one side A support beam 23 is connected in the middle to support the horizontal sliding mechanism 3, and the cylindrical FPSO platform model 1 is immersed in water to a suitable depth by adjusting the connection height of the support beam 23.

The horizontal sliding mechanism 3 is composed of a slider 31 and a linear track 32, so that the cylindrical FPSO platform model 1 performs vortex-induced motion along the linear track 32 in the horizontal plane; the four sides of the slider 31 have holes for installing the air bearing 41. The air flow generating mechanism 4 is composed of an air compressor, a compressed air air guide pipe and an air bearing 41, which is used to reduce the friction between the cylindrical FPSO platform model 1 and the overall support mechanism 2 during the movement; the air bearing 41 passes through the bolt It is connected with the locking nut and the slider 31, and a small gap is maintained between the air bearing 41 and the linear track 32; the air bearing 41 is connected with an external air compressor through a compressed air duct, and the air bearing 41 is in operation. An airflow gap is formed between the plane of the linear track 32 and the friction caused by the direct contact between the slider 31 and the linear track 32 is avoided.

The horizontal mooring mechanism 5 is composed of a tension spring 51 and a tension sensor 52, which provides the required horizontal stiffness and restoring force for the cylindrical FPSO platform model 1; one end of the tension spring 51 is connected to the slider 31, and the other end is connected to the tension sensor 52 is then connected to the end of the linear track 32, and the tension spring 51 is kept parallel to the surface of the linear track 32; the value of the tension sensor 52 can be post-processed to obtain the displacement response of the cylindrical FPSO platform model 1.

The yaw adjustment mechanism 6 includes a limit pin 61, a rolling bearing 62, a snap ring 63, a linear spring 64, and an inelastic connecting rope 65, which can limit or release the degree of freedom of the yaw, and facilitate the study of the influence of the yaw motion; the limit pin 61 Insert the hole on one side of the slider 31 through the opening of the central pillar 12 to limit the degree of freedom of the yaw. Pull out the limit pin 61 to release the degree of freedom of the yaw; the rolling bearing 62 is fixed on both sides by the snap ring 63 On the slider 31, the central pillar 12 of the cylindrical FPSO platform model 1 is suspended above the water tank through the axis of the rolling bearing 62; one end of the linear spring 64 is connected to the slider 31, and the other end is connected to the inelastic connecting rope 65, without The other end of the elastic connecting rope 65 is tied to the central pillar 12, keeping the linear spring 64 and the non-elastic connecting rope 65 parallel to the surface of the slider 31, and the yaw stiffness of the cylindrical FPSO platform model 1 can be changed by replacing the linear spring 64 , making the yaw stiffness linearly controllable.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (9)

1. A cylindrical type FPSO platform vortex-induced motion water tank experimental device is characterized in that, comprises cylindrical type FPSO platform model (1), integral support mechanism (2), horizontal sliding mechanism (3), airflow generating mechanism (4 ), a horizontal mooring mechanism (5) and a yaw adjustment mechanism (6), the cylindrical FPSO platform model (1) passes through the yaw adjustment mechanism (6) and the airflow generating mechanism (4) and the The horizontal sliding mechanism (3) is connected, and the horizontal sliding mechanism (3) is horizontally placed above the water tank through the integral support mechanism (2). The integral support mechanism (2) is fixed on the top of the water tank, and the cylinder The cylindrical FPSO platform model (1) is immersed in water, the yaw adjustment mechanism (6) is connected to the cylindrical FPSO platform model (1), and one end of the yaw adjustment mechanism (6) is connected to the horizontal slide mechanism (3), the other end of the yaw adjustment mechanism (6) is connected to the cylindrical FPSO platform model (1). 2. the cylindrical type FPSO platform vortex-induced motion water tank experimental device according to claim 1, characterized in that, the air flow generating mechanism (4) is embedded in the slide block (31) of the horizontal sliding mechanism (3) . 3. cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 1, is characterized in that, described yaw adjustment mechanism (6) is installed on the central axis of described cylindrical FPSO platform model (1) (12), and the yaw adjustment mechanism (6) is connected to the slider (31) of the horizontal slide mechanism (3). 4. cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 3, is characterized in that, described cylindrical FPSO platform model (1) comprises cylindrical FPSO platform model body (11), central pillar (12) and support rods (13), the inner bottom of the cylindrical FPSO platform model body (11) is connected with the coaxial center of the disc bottom of the central pillar (12), and the support rods (13) are symmetrical The cylindrical FPSO platform model body (11) is connected with the central pillar (12). 5. The cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 1, wherein the integral support mechanism (2) includes a beam (21), a beam (22) and a support beam (23) , the beam (21) is connected to the top of the water tank, the beam (22) is vertically connected to both sides of the beam (21), and the support beam (23) is connected between the beams (22), The supporting beams (23) are distributed along the flow direction of the water tank, and the supporting beams (23) are connected to the horizontal sliding mechanism (3). 6. cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 1, is characterized in that, described horizontal sliding mechanism (3) comprises slide block (31) and linear track (32), and described slide block (31) sliding on the linear track (32), driving the cylindrical FPSO platform model (1) to perform vortex induced motion along the linear guide track (32); The slider (31) is provided with a small hole, and the small hole is connected to the air bearing (41) in the air flow generating mechanism (4). 7. cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 2, is characterized in that, described air flow generating mechanism (4) comprises air compressor, compressed air air guide pipe and air bearing (41), The air bearing (41) is connected to the slide block (31), and the air bearing (41) is connected to an external air compressor through the compressed air duct. When working, the air bearing (41) An airflow gap is formed between the plane of the linear guide rail (32). 8. cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 6, is characterized in that, described horizontal mooring mechanism (5) comprises extension spring (51) and tension sensor (52), and described tension One end of the spring (51) is connected to the slide block (31), the other end of the extension spring (51) is connected to the tension sensor (52), and the tension sensor (52) is connected to the linear track (32). The extension spring (51) is kept parallel to the surface of the linear track (32), and the value of the tension sensor (52) is post-processed to obtain the displacement response of the cylindrical FPSO platform model (1). 9. cylindrical FPSO platform vortex-induced motion water tank experimental device according to claim 4, is characterized in that, described yaw adjustment mechanism (6) comprises limit pin (61), rolling bearing (62), snap ring ( 63), a linear spring (64) and an inelastic connecting rope (65), the limit pin (61) is inserted into the slider (31) through the opening of the central pillar (12) to limit the degree of freedom of yaw , the yaw degree of freedom is released when the limit pin (61) is pulled out, the rolling bearing (62) is fixed on the sliders (31) on both sides through the snap ring (63), the cylindrical The central pillar (12) of the FPSO platform model (1) is suspended above the water tank through the axis of the rolling bearing (62), and one end of the linear spring (64) is connected to the slider (31), and the The other end of the linear spring (64) is connected to the inelastic connecting rope (65), and the inelastic connecting rope (65) is connected to the central pillar (12). The linear spring (64), the inelastic connecting rope (65) and the surface of the slider (31) remain parallel.

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