CN105300635A - Vertical and stepped incoming flow marine riser vortex-excited/parametrically excited coupled vibration test device - Google Patents
Vertical and stepped incoming flow marine riser vortex-excited/parametrically excited coupled vibration test device Download PDFInfo
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- CN105300635A CN105300635A CN201510600076.2A CN201510600076A CN105300635A CN 105300635 A CN105300635 A CN 105300635A CN 201510600076 A CN201510600076 A CN 201510600076A CN 105300635 A CN105300635 A CN 105300635A
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Abstract
The invention discloses a vertical and stepped incoming flow marine riser vortex-excited/parametrically excited coupled vibration test device. The device comprises a marine riser model, a transverse test support frame fixedly arranged at the bottom of a trailer, an axial force reciprocating apparatus, a strain acquisition instrument and a computer. A steel wire rope is connected between the marine riser model and the axial force reciprocating apparatus. The axial force reciprocating apparatus comprises a support seat, a motor, a connecting rod, a sliding rail, a sliding block, an eccentric-hole blind plate, an upper pulley, and a lower pulley. The motor is connected to a frequency converter. The motor rotates to drive the sliding block to conduct the reciprocating motion on the sliding rail via a connecting rod. The amplitude of the reciprocating movement of the sliding block is equal to the eccentric distance between the connecting rod and a connection screw on the eccentric-hole blind plate. Through changing the eccentric distance, the amplitude of the axial force can be changed. Through the steel wire rope, a tension spring is pulled to conduct the telescopic movement. The present invention solves the equipment difficulty of the vertical and stepped incoming flow variable-axial-force marine riser vortex-induced vibration test. Based on the above design, the axial force of the vertical and stepped flow field can be changed simply and harmonically, so that the test condition can better meet the working condition of the actual marine project.
Description
Technical field
What the present invention relates to is a kind of test unit of field of ocean engineering, specifically, relate to be a kind of vertical riser incoming flow marine riser vortex swash-ginseng swashs coupled vibrations test unit.
Background technology
Along with deep-sea is moved towards in the exploitation of Marine oil and gas resource, the importance of vertical tube structure progressively highlights.Vortex-induced vibration can occur at action of ocean current Ocean standpipe, in the situation of deep-sea, vortex-induced vibration is the main cause causing standpipe fatigure failure.Once standpipe destroys, except causing serious economic loss, also will cause oil accident, serious marine environmental pollution and problems of ecological security may be caused.
Marine riser top is generally connected with floating platform.Platform, along with wave generation heave movement, to riser top ends displacement temporal response, causes the generating period change with floating motion of standpipe axial force, thus causes standpipe in the horizontal direction Parametric excitation to occur.Parametric excitation can cause the instability of standpipe equilibrium position, the vibration of aggravation standpipe and fatigure failure.
Experimental study is that vortex-induced vibration studies basic means, can be used for disclosing the mechanism of vortex-induced vibration, vibration characteristics, checking revise vortex-induced vibration forecasting procedure etc.About elongated riser vortex excited vibration experimental study, be roughly divided into two classes: a class is the vortex induced vibration of slender flexible standpipe test carried out at natural water area.Riser model in this kind of test is general longer, and slenderness ratio is closest to actual, and test flow velocity drags by ship or other devices and formed.But the relative flow field that this kind of test riser model two ends boundary condition is undesirable, standpipe is formed outward affects very large by the factor such as manipulation level of the facilities such as place, sea situation and ship, tests costly simultaneously.Another kind of is the test carried out in artificial pond.The test figure obtained can be vortex-induced vibration forecasting model and makes benchmark, compared to the test carried out in natural pond, the advantage of artificial basin test is: flow field is easy to control, quality is good, and the boundary condition of standpipe easily designs, and can carry out test observation to multiple vortex-induced vibration influence factor.Present stage, the model test of carrying out in artificial pond has been widely applied to vortex-induced vibration of marine riser Study on Problems.
The practical experience of oceanographic engineering shows: be not unalterable from sea level to the flow velocity cross section within the scope of the entire depth of seabed, the deepwater regions in the such as Gulfian or South China Sea, in the scope on 300 meters, general top layer, mean flow rate is 4 to 5 times of the 300-800 rice depth of water, it is more than 20 times of below 800 meters of depth of waters, can find, the incoming flow within the scope of entire depth is stepped incoming flow.Through finding existing technical literature retrieval, the stepped incoming flow vortex-induced vibration of marine riser test be directed under plumbness has to be carried out.Paper " Laboratorymeasurementsofvortex-inducedvibrationsofaverti caltensionriserinasteppedcurrent " (the vertical single tensioned risers vortex-induced vibration test observation of stepped inlet flow conditions) in 21st phase " JournalofFluidsandStructures " magazine in 2005, devises the test unit of a set of exquisiteness.The towing basin water surface is holded up a bucket, bung is below the water surface, due to atmospheric reason, just the water column of height in 10 meters can be had after being evacuated in bucket, standpipe is long 13.12 meters, and upper end is fixed on the upper of bucket, and at the bottom of lower end and pond, annex supports, bucket is fixed on trailer, produces stepped incoming flow test condition after starting trailer.But this device cannot realize the cyclical variation of standpipe axial force, cannot realize vertical riser incoming flow marine riser vortex swash-ginseng swash coupled vibrations observe simultaneously.
Summary of the invention
The present invention is directed to difficult point and deficiency that vertical riser incoming flow becomes axial force vortex-induced vibration of marine riser experimental study existence, provide have studied a kind of vertical riser incoming flow marine riser vortex swash-ginseng swash coupled vibrations test unit, can the vertical ladder inlet flow conditions of test simulation, correlation test research work is carried out to the marine riser of axial force simple harmonic quantity change, probe into its vortex-induced vibration genesis mechanism and the change axial force parametric vibration of bringing out to the influencing mechanism etc. of vortex-induced vibration, try hard to provide necessary test reference and reference for engineering is actual.
In order to solve the problems of the technologies described above, a kind of vertical riser incoming flow marine riser vortex that the present invention proposes swashs-sharp coupled vibrations the test unit of ginseng, comprise marine riser model, transverse test support, trailer, axial force reciprocating apparatus, strain acquirement instrument and computing machine, one end of described marine riser model is provided with first end bracing or strutting arrangement, the other end of described marine riser model is provided with the second end bracing or strutting arrangement, described first end bracing or strutting arrangement is connected with the two ends of described transverse test support respectively with the top of the second end bracing or strutting arrangement, described transverse test support is fixed on the bottom of described trailer, described marine riser model comprises some wires and a thin-wall copper pipe, and the external diameter of described wire is 0.3mm, and described wire is 7 core wires, and the external diameter of described thin-wall copper pipe is 8mm, wall thickness is 1mm, some layers of heat-shrink tube and one deck silicone tube of mutual close contact is outwards provided with successively from the outside surface of described thin-wall copper pipe, multi-disc is provided with for gathering the foil gauge of strain between described thin-wall copper pipe and described heat-shrink tube, described foil gauge is connected with described wire by connection terminal, the two ends of described wire and one end of described thin-wall copper pipe or fix with the two ends of described thin-wall copper pipe respectively, one end of described thin-wall copper pipe is connected with the first column joint by pin, and the other end of described thin-wall copper pipe is connected with the second column joint by pin, described transverse test support comprises subject beam, and the top of described subject beam is provided with channel-section steel, and described trailer support is on channel-section steel, described trailer is provided with the axial force reciprocating apparatus be connected with marine riser model one end, described axial force reciprocating apparatus comprises bearing, motor, connecting link, slide rail, slide block, eccentric orfice blind plate, upper sheave and lower pulley, described motor is arranged on one end of bearing, described slide rail is arranged on the middle part of bearing, described slide block is assemblied on described slide rail, described upper sheave and lower pulley are all arranged on the other end of described bearing, described eccentric orfice blind plate is arranged on the output shaft of motor, described eccentric orfice blind plate is provided with the eccentric orfice of multiple different eccentric position, one end of described connecting link is provided with radial bars, described radial bars is plugged in one of them eccentric orfice, the other end of described connecting link is connected with described slide block, described first end bracing or strutting arrangement comprises the first stay pipe of vertical direction, the bottom of described first stay pipe is connected with the first back up pad, the inner side of described first back up pad is bolted first fair water fin parallel with described first back up pad, and the bottom of described first fair water fin is provided with a through hole, be provided with a universal coupling in through hole, one end of described universal coupling is fixed in the first back up pad by universal coupling screw, and the other end of described universal coupling is connected with the first column joint in described marine riser model, described the second end bracing or strutting arrangement comprises the second stay pipe of vertical direction, the bottom of described second stay pipe is connected with the second back up pad, the inner side of described second back up pad is bolted second fair water fin parallel with described second back up pad, the bottom of described second fair water fin is provided with a Pipe installing through hole, the outside of described second back up pad is provided with a pulley, and the below described second back up pad being positioned at described pulley is provided with a wire rope via hole, the inner side of described second fair water fin is fixed with streamline radome fairing, and described streamlined radome fairing covers the shaft part of described marine riser model one end, second column joint connecting steel wire ropes of described marine riser model, connect pulling force stretcher, tension spring and pulling force sensor successively after walking around the pulley outside described second back up pad after wire rope via hole in this steel wire penetrating second back up pad, be finally connected on the slide block in described axial force reciprocating apparatus, the axis of described wire rope and described marine riser model is in same plane, the output shaft center of described motor, the plane of symmetry up and down of described connecting link, the plane of symmetry up and down of described slide block is all positioned at same level height with the top edge of the pulley groove of described upper sheave, the pulley groove edge of described upper sheave and the pulley groove edge of described lower pulley are point-blank, described motor is connected with frequency converter, described electric machine rotation, the to-and-fro movement on described slide rail of described slide block is made by described connecting link, reciprocating amplitude is the eccentric throw of link position point on described connecting link and described eccentric orfice blind plate, thus realize the change of axial force amplitude, in the reciprocatory movement of described slide block, described tension spring is driven to make stretching motion by wire rope, described wire and described pulling force sensor connect with described strain acquirement instrument, and described strain acquirement instrument is connected with described computing machine.
Compared with prior art, the invention has the beneficial effects as follows:
The invention solves the equipment difficult problem that vertical riser incoming flow becomes the test of axial force vortex-induced vibration of marine riser, axial force, the vertical riser flow field of simple harmonic quantity change can be realized by design, make the more realistic oceanographic engineering operating mode of test condition.The present invention can realize the Parametric excitation coupling of vortex-induced vibration-change axial force, the simplicity of design of apparatus of the present invention simultaneously, Installation and Debugging are convenient, cheap, it is the requisite device measure of deep sea vertical pipe vortex-induced vibration and parametric vibration experimental study, compensate for the blank that academia lacks the rig for testing of vertical riser incoming flow simple harmonic quantity change axial force vortex-induced vibration of marine riser, there is important application value and scientific meaning.
Accompanying drawing explanation
Fig. 1 is the structural representation of the standpipe vortex vibration testing device not suppressing structure in the present invention;
Fig. 2 is the thick column joint at the marine riser model two ends not suppressing structure in the present invention and thin column joint schematic diagram;
Fig. 3 is the structural representation with the standpipe vortex vibration testing device of suppression structure in the present invention;
Fig. 4 is with the thick column joint at the marine riser model two ends of suppression structure and thin column joint schematic diagram in the present invention;
Fig. 5 is first, second back up pad 14 structural representation shown in Fig. 1;
Fig. 6 is the structural representation of fair water fin 11 shown in Fig. 1 and streamlined radome fairing 27;
Fig. 7 is transverse test support structure vertical view;
Fig. 8 is the right view of the support of transverse test shown in Fig. 7;
Fig. 9 is the vertical view of transverse test support and trailer mutual alignment;
Figure 10 is the right view of the support of transverse test shown in Fig. 9 and trailer mutual alignment;
Figure 11 is the front view of axial force reciprocating apparatus;
Figure 12 is the vertical view of axial force reciprocating apparatus
Figure 13-1 is the end direction view of streamlined radome fairing in the present invention;
Figure 13-2 is vertical views of streamlined radome fairing shown in Figure 13-1;
Figure 13-3 is views of streamlined radome fairing backwater one side shown in Figure 13-1;
Figure 13-4 be streamlined radome fairing shown in Figure 13-1 meet water one side view;
Figure 14 is the marine riser model structure schematic diagram with spiral strake restraining device.
In figure:
First, second end of 1-marine riser model 2-bracing or strutting arrangement 3-transverse test support
4-slide block 5-first column joint 6-second column joint
7-pin 51-thin-wall copper pipe 9-down tube
First, second fair water fin of 10-universal coupling 11-12-hog frame
First, second back up pad 15-universal coupling screw of first, second stay pipe of 13-14-
16-pulley 17-wire rope 18-fair water fin fixed screw
19-tension spring 20-trailer 21-slide rail
22-upper sheave 23-lower pulley 24-pulling force stretcher
25-pulling force sensor 27-streamlined radome fairing 28-coaming plate
29-outer plate 30-spiral strake 31-connecting link
32-motor 33-becomes axial force mechanism bearing 34-eccentric orfice blind plate
53-foil gauge 55-heat-shrink tube 56-silicone tube
Embodiment
Be described in further detail technical solution of the present invention below in conjunction with the drawings and specific embodiments, described specific embodiment only explains the present invention, not in order to limit the present invention.
As shown in Figure 1, the present invention is that a kind of vertical riser incoming flow marine riser vortex swashs the-sharp coupled vibrations test unit of ginseng, comprise marine riser model 1, transverse test support 3, trailer, axial force reciprocating apparatus, strain acquirement instrument and computing machine, one end of described marine riser model 1 is provided with first end bracing or strutting arrangement, the other end of described marine riser model 1 is provided with the second end bracing or strutting arrangement, described first end bracing or strutting arrangement is connected with the two ends of described transverse test support 3 respectively with the top of the second end bracing or strutting arrangement, as shown in Figure 9 and Figure 10, described transverse test support 3 is fixed on the bottom of described trailer, described axial force reciprocating apparatus is arranged on trailer edge, be connected with marine riser model 1 by wire rope 17.
Described marine riser model 1 both can be naked pipe, as shown in Figure 2; Also can be with suppression structure and spiral strake 30, as shown in Figure 4; If described marine riser model 1 is naked pipe, its structure is: comprise some wires and a thin-wall copper pipe 51, and the external diameter of described wire is 0.3mm, and described wire is 7 core wires, and the external diameter of described thin-wall copper pipe 51 is 8mm, wall thickness is 1mm; Some layers of heat-shrink tube 55 and one deck silicone tube 56 of mutual close contact is outwards provided with successively from the outside surface of described thin-wall copper pipe 51, multi-disc is provided with for gathering the foil gauge 53 of strain between described thin-wall copper pipe 51 and described heat-shrink tube 55, described foil gauge 53 is connected with described wire by connection terminal, the two ends of described wire and one end of described thin-wall copper pipe 51 or fix with the two ends of described thin-wall copper pipe 51 respectively; One end of described thin-wall copper pipe 51 is connected with the first column joint 5 by pin 7, and the other end of described thin-wall copper pipe 51 is connected with the second column joint 6 by pin 7, as shown in Figure 2; If with suppressing structure, then on the basis of above-mentioned naked pipe structure, silicone tube 56 outside surface of described marine riser model 1 is provided with the silicone band 30 of many helically wire, and the transversal section of described silicone band 30 is identical with the shape of the transversal section of test pipe spiral strake, as shown in Figure 4.
Described transverse test support 3 comprises subject beam, and the top of described subject beam is provided with channel-section steel, and described trailer support is on channel-section steel; As shown in Figure 7 and Figure 8.
Described first end bracing or strutting arrangement comprises the first stay pipe 13 of vertical direction, the bottom of described first stay pipe 13 is connected with the first back up pad 14, the inner side of described first back up pad 14 is bolted first fair water fin 11 parallel with described first back up pad 14, the bottom of described first fair water fin 11 is provided with a through hole, a universal coupling 10 is provided with in described through hole, one end of described universal coupling 10 is fixed in the first back up pad by universal coupling screw 15, the other end of described universal coupling 10 is connected with the first column joint 5 in described marine riser model 1.
Described the second end bracing or strutting arrangement comprises the second stay pipe 13 of vertical direction, the top of described second stay pipe 13 is connected with the other end of described subject beam, the plane that second stay pipe and transverse test support form applies down tube 9, between namely on the inner side and subject beam of described second stay pipe 13, is connected with down tube 9; The bottom of described second stay pipe 13 is connected with the second back up pad 14, the inner side of described second back up pad 14 is bolted second fair water fin 11 parallel with described second back up pad 14, described second fair water fin 11 is plastic plate, described second fair water fin 11 is provided with hog frame 12, adopts screw to be fixed together between described second back up pad 14, second fair water fin 11 and hog frame 12.The bottom of described second fair water fin 11 is provided with a Pipe installing through hole, and the outside of described second back up pad 14 is provided with a pulley 16, and the below described second back up pad 14 being positioned at described pulley is provided with a wire rope via hole.In the present invention, the material of first, second back up pad 14 is steel plate, and does triangle reinforcement with angle bar, as shown in Figure 5.
The inner side of described second fair water fin 11 is fixed with streamline radome fairing 27, and as shown in figures 1 and 3, described streamlined radome fairing covers the shaft part of described marine riser model 1 one or both ends; As shown in Figure 13-1, Figure 13-2, Figure 13-3 and Figure 13-4, described streamlined radome fairing 27 comprises streamlined coaming plate 28 and is arranged on the outer plate 29 of coaming plate 28 one end, described outer plate 29 is provided with bolt through-hole, as shown in Figure 6, described streamlined radome fairing 27 and the first fair water fin 11 or with bolts between described streamlined radome fairing 27 and the second fair water fin 11, described streamlined radome fairing 27 can reduce resistance and the wave making of stepped incoming flow bringing device in trailer dragging process greatly.
On described subject beam with the link of the second end bracing or strutting arrangement bottom the second column joint 6 connecting steel wire ropes of marine riser model 1, walk around after this steel wire penetrating back up pad 14 that pulley connects pulling force stretcher 24 successively, tension spring 19, pulling force sensor 25 are finally connected with axial force reciprocating apparatus; The axis of described wire rope 17 and described marine riser model 1 is in same plane;
As is illustrated by figs. 11 and 12, described axial force reciprocating apparatus is arranged on the edge of trailer 20, described axial force reciprocating apparatus comprises bearing 33, motor 32, connecting link 31, slide rail 21, slide block 4, eccentric orfice blind plate 34, upper sheave 22 and lower pulley 23, described motor 32 is arranged on one end of bearing 33, described slide rail 21 is arranged on the middle part of bearing 33, described slide block 4 is assemblied on described slide rail 21, described upper sheave 22 and lower pulley 23 are all arranged on the other end of described bearing 33, described eccentric orfice blind plate 34 is arranged on the output shaft of motor 32, described eccentric orfice blind plate 34 is provided with the eccentric orfice of multiple different eccentric position, described connecting link 31 one end connects eccentric orfice blind plate 34, namely one end of described connecting link 31 is provided with radial bars, described radial bars is plugged in one of them eccentric orfice, the other end of described connecting link 31 is connected with described slide block 4, slide block 4 is placed in slide rail 21, one end connecting steel wire ropes 17 of slide block 4, wire rope 17 around entering in upper sheave 22 groove, and is connected with pulling force sensor 25, tension spring 19, pulling force stretcher 24 to downward-extension around entering in lower pulley 23 groove, is finally connected with marine riser model 1.Above-mentioned motor 32 axle center, slide block 4 center, the top edge of upper sheave 22 groove is positioned at same level height, upper sheave 22 groove edge and lower pulley 23 groove inward flange point-blank motor 32 are connected frequency converter and connect power supply, the frequency being changed supply voltage by frequency converter can regulate motor 32 to the rotating speed needed, meet the frequency of axial force change, eccentric orfice blind plate 34 is apart from open screw hole, relevant position, motor 32 axle center, connecting link 31 one end is screwed into screw hole by screw, motor 32 rotates, slide block 4 to-and-fro movement on slide rail 21 is made by connecting link 31, slide block 4 drives tension spring 19 to make stretching motion by wire rope 17, reciprocating amplitude is the eccentric throw of screw hole, the change of axial force amplitude is realized by changing eccentric throw, described wire and described pulling force sensor connect with described strain acquirement instrument, and described strain acquirement instrument is connected with described computing machine.
Below introduce making and the installation process of the present embodiment device: before the test, first according to the yardstick of towing basin, the speed of trailer 20, the concrete condition of operating condition of test and the economy of test, obtain the concrete yardstick of marine riser model 1.According to the yardstick of marine riser model 1, the yardstick of trailer 20 and the concrete condition of operating condition of test and economy, determine transverse test support 3, first, second end bracing or strutting arrangement 2, the material of streamlined radome fairing 27 and yardstick.
Make marine riser model 1, transverse test support 3, first, second end bracing or strutting arrangement 2, streamlined radome fairing 27, each instrument and equipment outsourcing of measuring and analysis system.
As shown in figure 14, for the marine riser model with suppression structure, its manufacture process is as follows: before and after first marking along copper pipe axis direction in platform plane relatively, four parallel lines opposing upper and lower, determine foil gauge 53 paste position.Thin-wall copper pipe 51 two ends are loaded onto thick column joint and thin column joint respectively.Remove the oxide layer of foil gauge 53 paste position copper pipe surface, paste foil gauge 53, front and back foil gauge is mutually a pair, upper and lower foil gauge is mutually a pair, all adopt half-bridge connection, and connect wire by connection terminal, the filament wherein connected with connection terminal by foil gauge with thin adhesive tape and copper pipe surface separate, to realize insulation, proper amount of silicon rubber is coated with at strain gauge adhesion place, to reach the object of protection and waterproof, to draw the wire of each position to copper pipe two ends and with thin adhesive tape, wire is fixed along copper pipe axis direction, then some layers of heat-shrink tube (making its outside surface and silicone tube inside surface close contact) on overlapping outside copper pipe, last layer silicone tube 56 is overlapped (if naked pipe structure outside heat-shrink tube 55, so far this marine riser model has been defined), from the left side of pipe, a pitch is divided into some parts, use helix mark locating ring to determine helix position in each position, use bonding three silica gel strips of helix cemented in place ring, the silica gel of the process not bonding silica gel strip position of silicone tube, make silica gel strip surface clean neatly smooth, bonding silica gel strip represents the spiral strake 30 in vortex-induced vibration suppression, finally being coated with proper amount of silicon rubber at model two ends prevents model from intaking.
By transverse test support 3, first, second end bracing or strutting arrangement 2 installs, streamlined radome fairing 27 is arranged on one of them fair water fin or two fair water fins 11, shown in Fig. 1 and Fig. 3 is install streamlined radome fairing 27 respectively on two fair water fins, and the wire that marine riser model 1 one or both ends are drawn is along first or the second end bracing or strutting arrangement 2 or extend to the one or both ends of transverse test support 3 respectively along first, second end bracing or strutting arrangement 2.Bottom whole test unit to trailer 20, with loop wheel machine, test unit is sling, and install.The eccentric orfice of suitable distance is selected to be connected with the radial bars of connecting link end according to the amplitude becoming axial force, such as: this radial bars is screw, eccentric orfice is screw hole, the eccentric throw of its eccentric orfice is exactly amplitude, connecting link is arranged in this screw hole by screw, eccentric orfice blind plate is gone to equilibrium position, namely screw hole is positioned at peak or minimum point, now slide block 4 is positioned at reciprocating centre position, pulling force is made to reach average tension value by regulating pulling force stretcher, the frequency of motor 32 supply voltage is regulated by frequency converter, motor 32 is made to reach rotating speed needed for operating mode, meet the frequency requirement of axial force change.Pulling force sensor 25 is connected with strainmeter with wire, and strainmeter connects computing machine.When trailer starts, streamlined sleeve coaming plate 28 inner fluid is static relative to riser model, has fluid to flow, namely realize ladder incoming flow in the middle part of model.
After all appts device installs, need to debug.After debugging, can test by operating mode and test specification.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although above-described embodiment is to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can to the present invention's amendment or equivalent replacement, and not departing from any amendment or the local replacement of the spirit and scope of the present invention, it all should be encompassed among right of the present invention.
Claims (5)
1. a vertical riser incoming flow marine riser vortex swashs the-sharp coupled vibrations test unit of ginseng, it is characterized in that, comprise marine riser model (1), transverse test support (3), trailer (20), strain acquirement instrument and computing machine, one end of described marine riser model (1) is provided with first end bracing or strutting arrangement, the other end of described marine riser model (1) is provided with the second end bracing or strutting arrangement, described first end bracing or strutting arrangement is connected with the two ends of described transverse test support (3) respectively with the top of the second end bracing or strutting arrangement, described transverse test support (3) is fixed on the bottom of described trailer (20),
Described marine riser model (1) comprises some wires and a thin-wall copper pipe (51), and the external diameter of described wire is 0.3mm, and described wire is 7 core wires, and the external diameter of described thin-wall copper pipe (51) is 8mm, wall thickness is 1mm; Some layers of heat-shrink tube (55) and one deck silicone tube (56) of mutual close contact is outwards provided with successively from the outside surface of described thin-wall copper pipe (51), multi-disc is provided with for gathering the foil gauge (53) of strain between described thin-wall copper pipe (51) and described heat-shrink tube (55), described foil gauge (53) is connected with described wire by connection terminal, the two ends of described wire and one end of described thin-wall copper pipe (51) or fix with the two ends of described thin-wall copper pipe (51) respectively; One end of described thin-wall copper pipe (51) is connected with the first column joint (5) by pin (7), and the other end of described thin-wall copper pipe (51) is connected with the second column joint (6) by pin (7);
Described transverse test support (3) comprises subject beam, and the top of described subject beam is provided with channel-section steel, and described trailer (20) is supported on channel-section steel; Described trailer (20) is provided with the axial force reciprocating apparatus be connected with marine riser model (1) one end;
Described axial force reciprocating apparatus comprises bearing (33), motor (32), connecting link (31), slide rail (21), slide block (4), eccentric orfice blind plate (34), upper sheave (22) and lower pulley (23), described motor (32) is arranged on one end of bearing (33), described slide rail (21) is arranged on the middle part of bearing (33), described slide block (4) is assemblied on described slide rail (21), described upper sheave (22) and lower pulley (23) are all arranged on the other end of described bearing (33), described eccentric orfice blind plate (34) is arranged on the output shaft of motor (32), described eccentric orfice blind plate (34) is provided with the eccentric orfice of multiple different eccentric position, one end of described connecting link (31) is provided with radial bars, described radial bars is plugged in one of them eccentric orfice, the other end of described connecting link (31) is connected with described slide block (4),
Described first end bracing or strutting arrangement comprises the first stay pipe of vertical direction, the bottom of described first stay pipe is connected with the first back up pad, the inner side of described first back up pad is bolted first fair water fin parallel with described first back up pad, and the bottom of described first fair water fin is provided with a through hole; A universal coupling is provided with in through hole, one end of described universal coupling is fixed in the first back up pad by universal coupling screw, and the other end of described universal coupling is connected with the first column joint (5) in described marine riser model (1);
Described the second end bracing or strutting arrangement comprises the second stay pipe of vertical direction, the bottom of described second stay pipe is connected with the second back up pad, the inner side of described second back up pad is bolted second fair water fin parallel with described second back up pad, the bottom of described second fair water fin is provided with a Pipe installing through hole, the outside of described second back up pad is provided with a pulley (16), and the below described second back up pad being positioned at described pulley (16) is provided with a wire rope via hole; The inner side of described second fair water fin is fixed with streamline radome fairing (27), and described streamlined radome fairing (27) covers the shaft part of described marine riser model (1) one end;
Second column joint (6) connecting steel wire ropes (17) of described marine riser model (1), this wire rope (17) connects pulling force stretcher (24), tension spring (19) and pulling force sensor (25) successively through after the pulley (16) walked around after the wire rope via hole in the second back up pad outside described second back up pad, is finally connected on the slide block (4) in described axial force reciprocating apparatus; The axis of described wire rope (17) and described marine riser model (1) is in same plane;
The output shaft center of described motor (32), the plane of symmetry up and down of described connecting link (31), the plane of symmetry up and down of described slide block (4) is all positioned at same level height with the top edge of the pulley groove of described upper sheave (22), the pulley groove edge of described upper sheave (22) and the pulley groove edge of described lower pulley (23) are point-blank, described motor (32) is connected with frequency converter, described motor (32) rotates, make described slide block (4) in the upper to-and-fro movement of described slide rail (21) by described connecting link (31), reciprocating amplitude is the eccentric throw of the upper link position point of described connecting link (31) and described eccentric orfice blind plate (34), thus realize the change of axial force amplitude, in the reciprocatory movement of described slide block (4), described tension spring (19) is driven to make stretching motion by wire rope (17),
Described wire and described pulling force sensor connect with described strain acquirement instrument, and described strain acquirement instrument is connected with described computing machine.
2. vertical riser incoming flow marine riser vortex swashs the-sharp coupled vibrations test unit of ginseng according to claim 1, it is characterized in that, silicone tube (56) outside surface of described marine riser model (1) is provided with the silicone band (27) of many helically wire, and the transversal section of described silicone band (27) is identical with the shape of the transversal section of test pipe spiral strake.
3. vertical riser incoming flow marine riser vortex swashs the-sharp coupled vibrations test unit of ginseng according to claim 1, it is characterized in that, between on the inner side of described first stay pipe (13) and subject beam and the inner side of described second stay pipe (13) and subject beam, be connected with down tube (9) respectively.
4. vertical riser incoming flow marine riser vortex swashs the-sharp coupled vibrations test unit of ginseng according to claim 1, it is characterized in that, described first fair water fin and the second fair water fin are plastic plate, and described first fair water fin and described second fair water fin are respectively equipped with hog frame (12).
5. vertical riser incoming flow marine riser vortex swashs the-sharp coupled vibrations test unit of ginseng according to claim 1, it is characterized in that, described streamlined radome fairing (27) comprises streamlined coaming plate (28) and is arranged on the outer plate (29) of coaming plate (28) one end, described outer plate (29) is provided with bolt through-hole, with bolts between described streamlined radome fairing (27) and the second fair water fin (11).
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