CN109696293B - Deep sea multi-column type mooring floating platform vortex-induced motion water tank test device - Google Patents
Deep sea multi-column type mooring floating platform vortex-induced motion water tank test device Download PDFInfo
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- CN109696293B CN109696293B CN201910064285.8A CN201910064285A CN109696293B CN 109696293 B CN109696293 B CN 109696293B CN 201910064285 A CN201910064285 A CN 201910064285A CN 109696293 B CN109696293 B CN 109696293B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
The invention relates to a deep sea multi-column mooring floating platform vortex-induced motion water pool test device which comprises a trailer, a longitudinal motion guide rail mechanism, a transverse motion guide rail mechanism, a yawing rotation mechanism, an optical measurement mechanism and a top plate for mounting a floating platform model, wherein a longitudinal elastic part for determining longitudinal stiffness is further arranged between the trailer and the transverse motion guide rail mechanism, a transverse elastic part for determining transverse stiffness is further arranged between the transverse motion guide rail mechanism and the yawing rotation mechanism, and an elastic restraint part for determining rotation stiffness is further arranged between a yawing rotation support and a connecting main shaft. Compared with the prior art, the test device disclosed by the invention not only can accurately and equivalently simulate the three-degree-of-freedom rigidity of the mooring system in the horizontal plane under the actual sea condition, but also can simulate the vortex-induced motion response characteristic of the deep sea platform under the equivalent constraint of nonlinear rigidity.
Description
Technical Field
The invention belongs to the technical field of a test of a vortex-induced motion water tank of an ocean platform, and relates to a test device of a vortex-induced motion water tank of a deep-sea multi-column mooring floating platform.
Background
In recent years, with the development of ocean oil and gas resources turning from shallow sea to deep sea, the multi-column mooring floating platform has been rapidly developed and becomes one of the high and new technical equipment of current ocean engineering, and the multi-column mooring floating platform mainly comprises a semi-submersible platform and a tension leg platform. The platform has the advantages of low cost, simple installation, large effective load, strong later-stage expansion performance and the like, and about 70 percent of deep sea oil and gas development in the world currently uses the multi-upright-column floating platform. With the further development of China in the field of south-sea oil and gas resource development, the demand on a deep-sea mooring multi-column platform is increasingly urgent.
Because the main body structure of the multi-column mooring floating platform usually comprises a plurality of columns and a buoyancy tank structure, periodic vortex shedding can occur at the tail of each column under the action of certain ocean currents, so that resistance along the flow direction and lift force perpendicular to the flow direction are generated, and the platform generates large-amplitude vortex-induced motion. The large eddy motions affect the fatigue life of the platform anchor chain and riser system and even cause damage to the platform structure in severe cases. The vortex motion response of multi-spar moored floating platforms has become a critical factor in platform design.
the model pool test is a simple and reliable method for researching the vortex-induced motion of the multi-column mooring floating platform, the obtained test data can intuitively reflect the response amplitude characteristic of the vortex-induced motion of the multi-column mooring floating platform, the response amplitude characteristic is used as a basis for judging whether the motion performance of the platform meets the overall design index, and reference is provided for the design of a platform anchor chain and a riser system according to the test result.
the deep sea multi-column mooring floating platform needs a mooring system for positioning, the mooring system requires a large water depth in a simulation test in a water tank, and meanwhile, a certain incoming flow speed is required for realizing platform vortex motion, so that the traditional deep sea platform vortex motion water tank test is usually carried out in a towing water tank, and the platform mooring system is directly simplified into four linear springs in a horizontal plane. However, the traditional test method cannot ensure that the equivalent stiffness of three degrees of freedom, namely flow direction, transverse direction and yawing, is consistent with the actual situation, and meanwhile, when the return stiffness of the mooring system to the platform is no longer in a linear relation, the vortex-induced motion response characteristic of the deep sea platform under the equivalent constraint of the nonlinear stiffness cannot be measured.
The present invention has been made in view of the above background.
disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a test device for a deep-sea multi-column mooring floating platform vortex-induced motion water tank.
The purpose of the invention can be realized by the following technical scheme:
A deep sea multi-column mooring floating platform vortex-induced motion water tank test device comprises:
A trailer;
longitudinal motion guide rail mechanism: the device comprises a longitudinal guide rail frame fixed below a trailer, longitudinal slide rails arranged on two sides of the longitudinal guide rail frame, and a longitudinal slide block arranged on the longitudinal slide rails and moving along the longitudinal slide rails;
the transverse movement guide rail mechanism comprises: comprises a transverse guide rail frame fixedly connected with a longitudinal slide block, transverse slide ways arranged at two sides of the transverse guide rail frame, and a transverse slide block arranged on the transverse slide ways and moving along the transverse slide ways;
The bow swing rotating mechanism: comprises a bow swing rotating bracket fixedly connected with a transverse sliding block and a connecting main shaft vertically and rotatably arranged on the bow swing rotating bracket;
An optical measurement mechanism: the device comprises a test platform, a luminous piece and a tracking lens, wherein the test platform is positioned above a longitudinal motion guide rail mechanism and is fixedly connected with the top of a connecting main shaft;
Roof for installation of floating platform model: the bow swing rotating bracket is positioned below the bow swing rotating bracket and is fixedly connected with the bottom end of the connecting main shaft;
a longitudinal elastic part for determining longitudinal rigidity is further arranged between the trailer and the transverse movement guide rail mechanism, a transverse elastic part for determining transverse rigidity is further arranged between the transverse movement guide rail mechanism and the yawing rotating mechanism, and an elastic restraining part for determining rotary rigidity is further arranged between the yawing rotating bracket and the connecting main shaft.
Furthermore, a middle pull ring is arranged in the middle of the transverse two sides of the transverse guide rail frame, and the longitudinal elastic part comprises a longitudinal spring, two ends of the longitudinal spring are respectively connected with the middle pull ring and the trailer.
Furthermore, end pull rings are respectively arranged at two end parts along two transverse sides on the transverse guide rail frame, a coupling connecting piece extending into the space between the end pull rings at the same side on the transverse guide rail frame is fixedly connected to the yawing rotating support, a movable pull ring is arranged at the top of the coupling connecting piece, and the transverse elastic piece comprises a transverse spring, two ends of the transverse spring are respectively connected with the movable pull ring and the end pull ring.
Furthermore, a horizontal rotating connecting rod with two exposed ends penetrates through the connecting main shaft, and a restraining spring connected with the yawing rotating support is further arranged at the non-rotating center position of the rotating connecting rod.
Furthermore, two connecting base rods which are respectively positioned at two sides of the rotating connecting rod and are parallel to the rotating connecting rod are arranged on the yawing rotating support, and the restraining springs are uniformly arranged between the two connecting base rods and the two end parts of the rotating connecting rod.
It is further preferred that the restraining spring is adjustable in position at the point of attachment of the connecting base rod to the pivot link.
Furthermore, the longitudinal slide block and the transverse slide block are respectively nested on the longitudinal slide way and the transverse slide way in a static pressure air floatation mode.
Furthermore, a support rod extending out of the top of the longitudinal movement guide rail mechanism is arranged at the top end of the connecting main shaft, and the test platform is fixedly arranged on the support rod.
Further, the illuminating member comprises a plurality of illuminating lamp balls fixed on the test platform.
Further, the positions of the light-emitting piece and the tracking lens meet the following requirements: the moving luminous piece in the test process is always positioned in the measuring area covered by the tracking lens.
Furthermore, the top plate is fixedly connected with the bottom of the connecting main shaft through threads.
Compared with the prior art, the test device for the vortex-induced motion water pool of the deep-sea multi-column mooring floating platform can accurately and equivalently simulate the three-degree-of-freedom rigidity of a mooring system in a horizontal plane under the actual sea condition, and can simulate the vortex-induced motion response characteristic of the deep-sea platform under the equivalent constraint of nonlinear rigidity.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic side view of the present invention;
The notation in the figure is:
1-trailer, 2-multi-column platform model, 3-top plate, 4-connecting main shaft, 5-longitudinal spring, 6-adjusting support, 7-longitudinal guide rail support, 8-transverse guide rail support, 9-yawing rotating support, 10-longitudinal slide block, 11-longitudinal slide way, 12-middle pull ring, 13-bolt piece, 14-transverse spring, 15-transverse slide way, 16-coupling connecting piece, 17-transverse slide block, 18-movable pull ring, 19-constraint spring, 20-rotating connecting rod, 21-stay rod, 22-testing platform, 23-light-emitting lamp ball and 24-tracking lens.
Detailed Description
the invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Referring to fig. 1-3, the deep sea multi-column mooring floating platform vortex-induced motion pool test device comprises a trailer 1, a longitudinal motion guide rail mechanism, a transverse motion guide rail mechanism, a yawing rotation mechanism, an optical measurement mechanism and the like.
Referring to fig. 1 again, the longitudinal motion guide rail mechanism includes a longitudinal guide rail frame 7 fixed below the trailer 1 through an adjusting bracket 6, longitudinal slide rails 11 arranged on both sides of the longitudinal guide rail frame 7, and longitudinal slide blocks 10 disposed on and moving along the longitudinal slide rails 11, wherein the longitudinal slide blocks 10 are nested on the longitudinal slide rails 11 in a static air floating manner so as to be capable of sliding along the longitudinal direction with low friction, and here, the air floating guide rail device needs to provide a dry and stable air source, the air supply pressure is 0.4-0.6Mpa, and the four longitudinal slide blocks 10 simultaneously supply air to operate together.
Referring to fig. 1 to 3 again, the transverse moving rail mechanism includes a transverse rail frame 8 fixedly connected to the longitudinal slide block 10, transverse slide ways 15 disposed on both sides of the transverse rail frame 8, and a transverse slide block 17 disposed on and movable along the transverse slide ways 15. The transverse moving guide rail mechanism is arranged below the longitudinal moving guide rail mechanism, wherein the transverse guide rail frame 8 is connected with 4 longitudinal sliding blocks 10 in a bolt connection mode, and the connecting positions of the longitudinal sliding blocks 10 and the transverse guide rail frame 8 are adjusted and adjusted to be symmetrical along the central longitudinal axis of the longitudinal guide rail frame 7. The transverse slide ways 15 are fixed on two sides of the lower surface of the transverse guide rail frame 8, and four transverse slide blocks 17 are arranged on the transverse slide ways 15. Three circular pull rings are respectively arranged at two sides of the transverse guide rail frame 8, namely a middle pull ring 12 positioned in the middle of the transverse guide rail frame 8 and end pull rings positioned at two end parts. The longitudinal rigidity of the multi-column platform model 2 is equivalent through a longitudinal spring 5 with the same rigidity, one end of the longitudinal spring 5 is connected with a middle pull ring 12 on the transverse guide rail frame 8, and the other end of the longitudinal spring is connected with the trailer 1. The transverse stiffness of the multi-column platform model 2 is equivalent by adopting four transverse springs 14 with the same stiffness, one end of each transverse spring 14 is connected with a movable pull ring 18 extending between two end pull rings on the same side, and the other end of each transverse spring is connected with an end pull ring.
Referring to fig. 1-3 again, the yaw rotation mechanism is located below the lateral motion guide rail mechanism, and includes a yaw rotation bracket 9, a connecting spindle 4 with a bottom threaded for rotation in a horizontal plane, a rotation connecting rod 20, a restraining spring 19, and a coupling link 16. Wherein, the yawing rotating bracket 9 is fixedly connected with a transverse sliding block 17 and is fixedly connected with a movable pull ring 18 through a coupling connecting piece 16, so that the yawing rotating mechanism can slide along the transverse direction with low friction. The bottom end of the connecting main shaft 4 is fixedly provided with a top plate 3, and the top plate 3 and the multi-column platform model 2 are fixed through bolt pieces 13. The upper end part of the connecting main shaft 4 is connected with a rotating connecting rod 20, one end of a restraint spring 19 is connected with the rotating connecting rod 20, the other end of the restraint spring is connected with a rod piece fixed on the yawing rotating support 9, and the yawing motion rigidity of the mooring platform is equivalently simulated by adjusting the positions and the rigidity of the four restraint springs 19. The position adjustment of the restraining spring 19 may be performed by: rod sleeves which can move along the rod pieces are respectively arranged on the rotating connecting rod 20 and the yawing rotating bracket 9, and two ends of the restraining spring 19 are respectively connected with the rotating connecting rod 20 and the rod sleeves on the yawing rotating bracket 9, so that the position of the restraining spring 19 can be adjusted by adjusting the positions of the rod sleeves on the rotating connecting rod 20 and the like.
referring to fig. 1-3 again, the optical measurement mechanism includes a test platform 22 located above the longitudinal movement guide rail mechanism and fixedly connected to the top of the connecting main shaft 4 through a support rod 21, a light emitting element mounted on the test platform 22, and a tracking lens 24 fixedly connected to the trailer 1 and used for observing the movement locus of the light emitting element, the light emitting element includes a plurality of light emitting lamp balls 23 disposed on the test platform 22, the tracking lens 24 is fixed on the trailer 1 through a lens bracket, and simultaneously, the positions of the light emitting lamp balls 23 and the tracking lens 24 are adjusted, so that the light emitting lamp balls 23 are all located in the measurement area covered by the tracking lens 24.
The test method of the deep sea multi-column platform vortex motion water pool test device comprises the following specific steps:
(a) The method comprises the following steps The test rig is mounted on the trailer 1 and the multi-column platform model 2 is adjusted to the appropriate draught position by means of the threaded connecting spindles 4.
(b) The method comprises the following steps And calibrating the optical measuring mechanism by adopting a hack lever calibration method.
(c) The method comprises the following steps The start test starts trailer 1, and trailer 1's motion drives the forward motion of column platform model 2, and the removal speed (incoming flow velocity) of model is controlled by trailer 1, and after trailer 1 accelerates to reach test speed and steady operation, column platform model 2 began free motion under the incoming flow effect.
(d) The method comprises the following steps And acquiring test data, requiring the trailer 1 to stably move for a period of time, stopping acquiring the data when the duration curve of the transverse vortex motion of the multi-column platform model 2 reaches 15-20 periods, braking and decelerating the trailer 1, stopping the vehicle, and returning to the dock to perform a test at a next speed point.
(e) The method comprises the following steps The trailer 1 is started to the next speed point and step d is repeated.
(f) The method comprises the following steps Repeating the steps (c) to (e) to complete all speed point tests. And further analyzing the effectiveness of the collected test data, removing dead spots, then carrying out statistical analysis on duration curves of the recorded longitudinal motion amplitude, transverse motion amplitude and heading motion amplitude to obtain vortex-induced motion responses at different speed points, and drawing corresponding amplitude response curves.
the embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a deep sea multicolumn formula mooring floating platform vortex motion pond test device which characterized in that includes:
A trailer;
Longitudinal motion guide rail mechanism: the device comprises a longitudinal guide rail frame fixed below a trailer, longitudinal slide rails arranged on two sides of the longitudinal guide rail frame, and a longitudinal slide block arranged on the longitudinal slide rails and moving along the longitudinal slide rails;
the transverse movement guide rail mechanism comprises: comprises a transverse guide rail frame fixedly connected with a longitudinal slide block, transverse slide ways arranged at two sides of the transverse guide rail frame, and a transverse slide block arranged on the transverse slide ways and moving along the transverse slide ways;
The bow swing rotating mechanism: comprises a bow swing rotating bracket fixedly connected with a transverse sliding block and a connecting main shaft vertically and rotatably arranged on the bow swing rotating bracket;
An optical measurement mechanism: the device comprises a test platform, a luminous piece and a tracking lens, wherein the test platform is positioned above a longitudinal motion guide rail mechanism and is fixedly connected with the top of a connecting main shaft;
Roof for installation of floating platform model: the bow swing rotating bracket is positioned below the bow swing rotating bracket and is fixedly connected with the bottom end of the connecting main shaft;
A longitudinal elastic part for determining longitudinal rigidity is further arranged between the trailer and the transverse movement guide rail mechanism, a transverse elastic part for determining transverse rigidity is further arranged between the transverse movement guide rail mechanism and the yawing rotating mechanism, and an elastic restraining part for determining rotary rigidity is further arranged between the yawing rotating bracket and the connecting main shaft.
2. the test device for the vortex-induced motion water pool of the deep-sea multi-column mooring floating platform according to claim 1, wherein a middle pull ring is arranged on the transverse guide rail frame along the middle position of the two transverse sides, and the longitudinal elastic member comprises a longitudinal spring with two ends respectively connected with the middle pull ring and a trailer.
3. The deep sea multi-column mooring floating platform vortex-induced motion pool testing device as claimed in claim 1, wherein end pull rings are respectively arranged at two ends along two lateral sides of the lateral guide rail frame, the yawing rotating bracket is fixedly connected with a coupling connecting member extending between the two end pull rings at the same side of the lateral guide rail frame, a movable pull ring is arranged at the top of the coupling connecting member, and the lateral elastic member comprises a lateral spring with two ends respectively connected with the movable pull ring and the end pull ring.
4. The deep sea multi-column mooring floating platform vortex-induced motion pool test device as claimed in claim 1, wherein a horizontal rotation connecting rod with two exposed ends is arranged on the connecting main shaft in a penetrating manner, and a restraining spring connected with the yawing rotation bracket is further arranged at a non-rotation center position of the rotation connecting rod.
5. The deep sea multi-column mooring floating platform vortex-induced motion pool test device as claimed in claim 4, wherein the yawing rotating bracket is provided with two connecting base rods which are respectively located at two sides of the rotating connecting rod and are parallel to the rotating connecting rod, and the restraining springs are respectively arranged between the two connecting base rods and two end parts of the rotating connecting rod.
6. The deep sea multi-column mooring floating platform vortex-induced motion pool test device according to claim 5, wherein the position of the connection point of the restraining spring on the connecting base rod and the rotating connecting rod is adjustable.
7. The deep sea multi-column mooring floating platform vortex-induced motion pool test device as claimed in claim 1, wherein the longitudinal slide blocks and the transverse slide blocks are nested on the longitudinal slide ways and the transverse slide ways respectively in a static pressure air flotation mode.
8. The vortex-induced motion pool test device for the deep-sea multi-column mooring floating platform according to claim 1, wherein a stay bar extending out of the top of the longitudinal motion guide rail mechanism is arranged at the top end of the connecting main shaft, and the test platform is fixedly arranged on the stay bar.
9. The vortex-induced motion pool test device for the deep-sea multi-column mooring floating platform according to claim 1, wherein the light-emitting member comprises a plurality of light-emitting lamp balls fixed on the test platform, and the positions of the light-emitting member and the tracking lens meet the following requirements: the moving luminous piece in the test process is always positioned in the measuring area covered by the tracking lens.
10. The test device for the vortex-induced motion water tank of the deep-sea multi-column mooring floating platform according to claim 1, wherein the top plate is fixedly connected with the bottom of the connecting main shaft through threads.
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