CN107065945B - Active control method and device for bluff body streaming and vortex-induced vibration effect under shear incoming flow - Google Patents
Active control method and device for bluff body streaming and vortex-induced vibration effect under shear incoming flow Download PDFInfo
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- CN107065945B CN107065945B CN201710392835.XA CN201710392835A CN107065945B CN 107065945 B CN107065945 B CN 107065945B CN 201710392835 A CN201710392835 A CN 201710392835A CN 107065945 B CN107065945 B CN 107065945B
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- 239000012530 fluid Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 15
- 238000013016 damping Methods 0.000 claims description 11
- 238000010008 shearing Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 238000013461 design Methods 0.000 description 8
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- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention relates to a passive control method and device for bluff body streaming and vortex-induced vibration effect under shear incoming flow, which comprises a water pipe and a flow control column; a flow control column is arranged on the outer wall of the water pipe, the flow control column is communicated with the water pipe, a fixing ring is arranged between the flow control column and the water pipe, and the flow control column is connected with the fixing ring; when fluid around the water pipe changes, the water pipe vibrates, and the vibration sensor arranged in the fixing ring senses vibration; the control chip is wrapped in the fixed ring and controls a rotating rod on the flow control column to rotate by a specified angle according to a vibration signal obtained by the vibration sensor, so that the aim of controlling vibration is fulfilled; the mode that adopts step motor control current post position realizes the control to ocean current, and then reaches the effect of control pipeline vibration, and easy operation and precision are high, adopt many motor control, increase the stability and the life of device, have fine application prospect.
Description
Technical Field
The invention relates to the technical field of ocean engineering fluid protection, in particular to active control of bluff body streaming and vortex-induced vibration effect under shearing incoming flow.
Background
Most of fluid flows in nature occur in a shearing incoming flow mode instead of a uniform incoming flow mode, the incoming flow velocity of (ocean and wind) changes along with the change of height under the background of practical application, certain gradient changes also exist in the same height plane, and a blunt body structure (group) is widely existed in practical engineering, such as high-rise building structures, large-span space structures, bridge structures, ocean risers, ocean platforms, ship dragging systems and other fields; however, the research on the fluid-solid coupling problem of a bluff body structure (group) under the action of shearing incoming flow is not mature, the fatigue damage of a certain unit of the structure even can damage the whole structure due to wind or seawater ocean current load, and the engineering accidents are rare;
in the technical field of ocean engineering, a large amount of ocean fluid continuously impacts pipelines and cylinders buried in the ocean, and for a long time, the cylinders are easily damaged due to long-term uneven vibration, so that serious life and property loss is caused, therefore, the problem to be solved urgently is to design equipment for actively controlling the blunt body streaming and vortex-induced vibration effect under shearing incoming flow to protect ocean equipment;
the current ocean shear incoming flow protection equipment is still simple in mechanical design, and a good protection effect is difficult to achieve under a complex ocean current environment, so that the design of the protection equipment by adopting an advanced control technology and matching with a mechanical control mode is necessary.
Disclosure of Invention
Based on this, it is necessary to provide a new method and apparatus for actively controlling the body flow and vortex-induced vibration effect under the shear incoming flow to solve the above problems existing in the current shear incoming flow protection apparatus;
the active control method for the bluff body streaming and the vortex-induced vibration effect under the shearing incoming flow comprises the following steps:
s1, arranging a movable flow control column outside the water pipe;
s2, detecting the motion state of the water pipe in real time;
and S3, analyzing and processing the detection signal, adjusting the movement of the flow control column, and realizing active control.
The active control method of bluff body streaming and vortex induced vibration effect under shear flow of claim, comprising the steps of:
s1, arranging a fixing ring on the outer wall of the water pipe, wherein a plurality of flow control columns arranged around the outer wall of the water pipe are fixed in the fixing ring and can move around the outer wall of the water pipe;
s2, detecting the vibration condition of the water pipe in real time;
and S3, a control chip is wrapped inside the fixing ring, the control chip controls the rotating rod to rotate by a specified angle according to a vibration signal obtained by the vibration sensor, and the rotating rod drives the flow control column to move around the outer wall of the water pipe so as to achieve the purpose of controlling vibration.
The active control method of bluff body streaming and vortex induced vibration effect under shear flow of claim, comprising the steps of:
s1, arranging a fixing ring on the outer wall of the water pipe, wherein a plurality of flow control columns arranged around the outer wall of the water pipe are fixed in the fixing ring;
s2, when the fluid around or in the water pipe changes, the water pipe vibrates, and the vibration sensor arranged in the fixing ring senses the vibration;
and S3, a control chip is wrapped inside the fixing ring, the control chip controls the rotating rod to rotate by a specified angle according to a vibration signal obtained by the vibration sensor, and the rotating rod drives the flow control column to move around the outer wall of the water pipe so as to achieve the purpose of controlling vibration.
The active control equipment for the blunt body streaming and the vortex-induced vibration effect under the shearing incoming flow comprises a water pipe and a flow control column, wherein the flow control column is fixed on the water pipe through a fixing ring, a rotating rod is connected to the flow control column, a hydraulic rod is embedded in the rotating rod, a stepping motor is arranged in the fixing ring, and the rotating rod and the stepping motor are in matched transmission through a helical gear;
a control chip is arranged inside the fixing ring, and power supplies are respectively arranged beside the control chip to supply power to the control chip and the stepping motor; vibration sensors are distributed between the fixing ring and the water pipe, the vibration sensors are connected with a control chip through an acquisition chip, and a signal output end of the control chip is connected with a stepping motor and a signal input end of a hydraulic rod;
the active control method and the active control device for bluff body streaming and vortex-induced vibration effect under shearing incoming flow realize the control of ocean current by adopting the mode that the stepping motor controls the position of the flow control column, thereby achieving the effect of controlling the vibration of a pipeline, have simple operation and high precision, and have the advantages that the stepping angle of the stepping motor reaches 2 degrees, so the tiny vibration can be eliminated by utilizing the flow control column, meanwhile, the mode of controlling a plurality of stepping motors is adopted, because the effect of multiple control of a single motor is difficult to realize in a water pipe, the stability of the whole device is also improved by utilizing the control of the stepping motors,
in one embodiment, the surface of the fixing ring is in an oval design, and the design scheme can effectively reduce the influence of ocean currents on the fixing ring, reduce the resistance and prolong the service life;
in one embodiment, the bevel gear at the front section of the flow control column and the bevel gear at the front end of the stepping motor are in a separated state in a normal state and do not transmit;
in one embodiment, the flow control column is a metal columnar structure with an internal cavity, a vibration damping liquid is arranged in the internal cavity, the vibration damping liquid is liquid high molecular weight organopolysiloxane, the volume of the vibration damping liquid accounts for 1/2-2/3 of the volume of the internal cavity, and the vibration damping liquid is arranged in the flow control column, so that the influence of the vibration and vibration transmission of the flow control column on the vibration sensor is effectively reduced;
in one embodiment, the fixing ring is fixed by welding with the water pipe, and the fixing ring is internally of a cavity structure and is provided with a waterproof membrane, so that the design scheme provides more space for internal control equipment and is simultaneously effective in water proofing;
in one embodiment, the control chip is connected with the hydraulic rod and the stepping motor, so that the stepping motor and the hydraulic connecting rod can work cooperatively conveniently and rotate freely;
in one embodiment, the number of the stepping motors is 4-6, and the rotation angle of the stepping motors is 0-180 degrees according to the design, so that the arrangement of any position of the flow control columns can be achieved by adopting the design, the flow control effect is achieved, and the rotation 360 is not necessary in the device.
Drawings
FIG. 1 is an overall view of the apparatus of the present invention;
FIG. 2 is a schematic view of the connection of the flow control columns of the present invention;
FIG. 3 is a schematic view of the connection between the current-controlling pole and the stepping motor according to the present invention;
FIG. 4 is a view showing the connection between the fixing ring and the water pipe according to the present invention;
FIG. 5 is a view showing the connection between the fixing ring and the flow control column according to the present invention;
FIG. 6 is a schematic diagram of the position of the current-controlling column according to the present invention;
FIG. 7 is a schematic diagram of the circuit connection inside the fixing ring of the present invention.
Detailed Description
With reference to fig. 1 to 7, the present invention provides an active control method for passive body streaming and vortex-induced vibration effect under shear incoming flow, which is characterized by comprising the following steps:
s1 arranging a movable flow control column 2 outside the water pipe 1; by adopting the link mode, the random swing of the flow control column 2 is avoided, and the aim of good control is fulfilled;
s2, detecting the motion state of the water pipe 1 in real time; when the fluid around the water pipe 1 changes, the water pipe 1 vibrates, and the vibration sensor 8 arranged in the fixing ring 3 senses the vibration; the specific method is that the vibration sensor 8 senses the vibration and converts the vibration signal into an electric signal, and at the moment, the acquisition chip 10 converts the analog electric signal acquired by the vibration sensor into a digital electric signal and sends the digital electric signal to the control chip 9;
and s3, analyzing and processing the detection signal, and adjusting the movement of the flow control column 2 to realize active control.
Wherein:
the outer wall of the water pipe 1 is provided with a fixing ring 3, a plurality of flow control columns 2 arranged around the outer wall of the water pipe 1 are fixed in the fixing ring 3, and the flow control columns 2 can move around the outer wall of the water pipe 1; a fixing ring 3 is arranged on the outer wall of the water pipe 1, and a plurality of flow control columns 2 arranged around the outer wall of the water pipe 1 are fixed in the fixing ring 3; when the fluid around the water pipe 1 changes, the water pipe 1 vibrates, and the vibration sensor 8 arranged in the fixing ring 3 senses the vibration;
the inside parcel of solid fixed ring 3 has control chip 9, in the concrete implementation, the chip can be 8XC196MC, TMS320C240 or ADMC311 control chip, adopts these chips to have dedicated PWM control unit, can realize driven PWM control, can satisfy complicated drive control demand. The control chip 9 controls the rotating rod 4 to rotate by a specified angle according to the vibration signal obtained by the vibration sensor 8, and the rotating rod 4 drives the flow control column 2 to move around the outer wall of the water pipe 1, so that the purpose of controlling vibration is achieved; the specific method comprises the following steps: the control chip 9 obtains a vibration signal of the acquisition chip 10, specific vibration position and vibration strength are judged, the flow control tube 2 at a corresponding position is controlled to rotate for a certain angle according to a preset algorithm, the control chip 9 controls the hydraulic rod 6 to extend, at the moment, the helical gear 5 between the flow control column 2 and the stepping motor 7 is meshed, at the moment, the stepping motor 7 is controlled to rotate for a specified angle, the flow control column 2 reaches a specified position, after a rotation task is completed, the control chip 9 controls the hydraulic rod 6 to contract, at the moment, the helical gear 5 is separated to leave a space for the next flow control column 2 to rotate; the effect of controlling the position of the flow control column 2 is achieved repeatedly;
the active control equipment for the bluff body streaming and the vortex-induced vibration effect under the shearing incoming flow comprises a water pipe 1 and a flow control column 2, wherein the flow control column 2 is fixed on the water pipe 1 through a fixing ring 3, the flow control column 2 is connected with a rotating rod 4, a hydraulic rod 6 is embedded in the rotating rod 4, a stepping motor 7 is arranged in the fixing ring 3, and the rotating rod 4 and the stepping motor 7 are in matched transmission through a bevel gear 5;
a control chip 9 is arranged inside the fixing ring 3, and a power supply 11 is respectively arranged beside the control chip 9 to supply power to the control chip 9 and the stepping motor 7; vibration sensors 8 are distributed between the fixing ring 3 and the water pipe 1, the vibration sensors 8 are connected with a control chip 9 through an acquisition chip 10, and a signal output end of the control chip 9 is connected with signal input ends of the stepping motor 7 and the hydraulic rod 6.
A control chip 9 is arranged inside the fixing ring 3, and a power supply 11 is respectively arranged beside the control chip 9 to supply power to the control chip 9 and the stepping motor 7; vibration sensors 8 are distributed between the fixing ring 3 and the water pipe 1, and the vibration sensors 8 are connected with a control chip 9 through an acquisition chip 10.
The flow control column 2 is a metal columnar structure with an internal cavity, a vibration damping liquid is arranged in the internal cavity, a cavity type flow control column is adopted, the vibration of the flow control column 2 is further reduced, in addition, the vibration damping liquid is liquid high molecular weight organopolysiloxane, the volume of the vibration damping liquid accounts for 1/2-2/3 of the volume of the internal cavity, the vibration damping liquid is arranged in the flow control column 2, liquid buffer substances remarkably reduce the vibration received outside the flow control column 2, relatively speaking, the service life of the flow control column 2 is prolonged, the vibration is reduced, the vibration transmitted to the column body 1 is remarkably reduced, the vibration sensor 8 receives external vibration interference and reduces, the collected information is more accurate, and therefore the cavity is filled with the buffer agent, and the vibration is effectively reduced.
Still further, the outside of accuse post 2 is surrounded and is provided with the foam air bag body of aerifing, the foam air bag body of aerifing includes a plurality of evenly arranged's gasbag, the gasbag is rectangular form, and the length direction who flows the post along the accuse extends, and a plurality of gasbag formation gasbag group that arrange along the straight line, and the foam air bag body is aerifyd in the gasbag formation of multiunit parallel arrangement's gasbag group, it has the supersaturated solution to fill in the gasbag, like sodium acetate supersaturated solution, when the vibration of water pipe 1, forms anomalous vibration, and some local vibration is strong, and some local vibration is weak, and the place that vibrates strongly, supersaturated solution can a large amount of crystallization in this region, and the air can extrude to the region that vibrates slightly weak to the vibration of water pipe 1 forms local influence, reduces the vibration intensity, and the cooperation reaches active. Some water pipes are used for transmitting high-temperature fluid, and different kinds of supersaturated solutions can be adopted for the fluid with corresponding temperature, so that the crystallization and liquefaction of the supersaturated solutions can be matched with actual conditions. The inflatable foam air bag body is fixed on the flow control column 2 in a gluing mode, an elastic locking mode or a buckling mode.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A passive body flow winding and vortex-induced vibration effect active control method under shear incoming flow is characterized by comprising the following steps:
s1, arranging a fixing ring (3) on the outer wall of the water pipe (1), wherein a plurality of flow control columns (2) arranged around the outer wall of the water pipe (1) are fixed in the fixing ring (3), and the flow control columns (2) can move around the outer wall of the water pipe (1);
s2, detecting the vibration condition of the water pipe (1) in real time;
s3, a control chip (9) is fixed on the fixing ring (3), the control chip (9) controls the rotating rod (4) to rotate for a specified angle according to a vibration signal obtained by the vibration sensor (8), and the rotating rod (4) drives the flow control column (2) to move around the outer wall of the water pipe (1) so as to achieve the purpose of controlling vibration.
2. The active control method of bluff body streaming and vortex induced vibration effect under shear incoming flow according to claim 1,
the step s2 is specifically that when the fluid around or in the water pipe (1) changes, the water pipe (1) generates vibration, and the vibration sensor (8) arranged in the fixing ring (3) senses the vibration;
the step s3 is specifically that a control chip (9) wraps the inside of the fixing ring (3), the control chip (9) controls the rotating rod (4) to rotate for a specified angle according to a vibration signal obtained by the vibration sensor (8), and the rotating rod (4) drives the flow control column (2) to move around the outer wall of the water pipe (1) so as to achieve the purpose of controlling vibration.
3. The active control equipment for the flow of the blunt body and the vortex-induced vibration effect under shearing for realizing the active control method for the flow of the blunt body and the vortex-induced vibration effect under shearing according to claim 1 comprises a water pipe (1) and a flow control column (2), wherein the flow control column (2) is fixed on the water pipe (1) through a fixing ring (3), the flow control column (2) can move around the outer wall of the water pipe (1), a rotating rod (4) is connected onto the flow control column (2), a hydraulic rod (6) is embedded into the rotating rod (4), a stepping motor (7) is arranged inside the fixing ring (3), and the rotating rod (4) and the stepping motor (7) are in matched transmission through a helical gear (5);
a control chip (9) is arranged inside the fixing ring (3), and a power supply (11) is respectively arranged beside the control chip (9) to supply power to the control chip (9) and the stepping motor (7); vibration sensors (8) are distributed between the fixing ring (3) and the water pipe (1), the vibration sensors (8) are connected with a control chip (9) through an acquisition chip (10), and a signal output end of the control chip (9) is connected with a stepping motor (7) and a signal input end of a hydraulic rod (6); the control chip (9) controls the rotating rod (4) to rotate by a specified angle according to a vibration signal obtained by the vibration sensor (8), and the rotating rod (4) drives the flow control column (2) to move around the outer wall of the water pipe (1) so as to achieve the purpose of controlling vibration.
4. The active control device of bluff body streaming and vortex induced vibration effect under shear flow according to claim 3, wherein: the fixing ring (3) is an oval fixing track.
5. The active control device of bluff body streaming and vortex induced vibration effect under shear flow according to claim 3, wherein: and the control chip (9) controls the hydraulic rod (6) to stretch and retract so as to realize the matching and the separation of the bevel gear (5) between the rotating rod (4) and the stepping motor (7).
6. The active control device of bluff body streaming and vortex induced vibration effect under shear flow according to claim 3, wherein: the flow control column (2) is of a metal columnar structure with an internal cavity, a vibration damping liquid is arranged in the internal cavity, the vibration damping liquid is liquid high molecular weight organopolysiloxane, and the volume of the vibration damping liquid accounts for 1/2-2/3 of the volume of the internal cavity.
7. The active control device of bluff body streaming and vortex induced vibration effect under shear flow according to claim 3, wherein: the fixing ring (3) is fixed with the water pipe (1) in a welding mode, a cavity structure is arranged inside the fixing ring (3), and a waterproof film is arranged.
8. The active control device of bluff body streaming and vortex induced vibration effect under shear flow according to claim 3, wherein: the number of the stepping motors (7) is 4-6, which is the same as that of the flow control columns (2), and the rotating angle of the stepping motors (7) is 0-180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710392835.XA CN107065945B (en) | 2017-05-27 | 2017-05-27 | Active control method and device for bluff body streaming and vortex-induced vibration effect under shear incoming flow |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710392835.XA CN107065945B (en) | 2017-05-27 | 2017-05-27 | Active control method and device for bluff body streaming and vortex-induced vibration effect under shear incoming flow |
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| CN107065945A CN107065945A (en) | 2017-08-18 |
| CN107065945B true CN107065945B (en) | 2019-12-27 |
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| CN108533579A (en) * | 2018-04-03 | 2018-09-14 | 北京航空航天大学 | A kind of device and method of the inhibition flow around bluff bodies vortex based on synthesizing jet-flow |
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| AU2006203991B2 (en) * | 2005-01-07 | 2009-03-26 | Shell Internationale Research Maatschappij B.V. | Vortex induced vibration optimizing system |
| US8684040B2 (en) * | 2007-05-25 | 2014-04-01 | The Regents Of The University Of Michigan | Reduction of vortex induced forces and motion through surface roughness control |
| CN102505627B (en) * | 2011-11-03 | 2013-12-04 | 哈尔滨工业大学 | Suppression separation type box girder vortex induced vibration control system |
| CN103321593B (en) * | 2013-06-25 | 2015-02-04 | 西南石油大学 | Device and method for actively eliminating vortex-induced vibration of stand pipe |
| CN104712266B (en) * | 2015-01-08 | 2016-09-28 | 西南石油大学 | A kind of active and passive control synergistic standpipe equipment for inhibiting of vibration and method |
| CN105201420B (en) * | 2015-10-13 | 2017-03-22 | 西南石油大学 | Active vortex-induced vibration suppression device |
| CN106089121B (en) * | 2016-06-16 | 2018-05-04 | 西南石油大学 | One kind utilizes and returns Energy suppression marine riser vortex-induced vibration device and method on drilling fluid |
| CN106089108B (en) * | 2016-06-30 | 2018-01-09 | 西南石油大学 | A kind of vortex-induced vibration suppression device and method for draining injection destruction around laminar boundary layer |
| CN106223867B (en) * | 2016-09-23 | 2018-05-22 | 西南石油大学 | A kind of device and method for adjusting riser systems structural parameters and avoiding Vortex-excited vibration |
| CN106285511B (en) * | 2016-09-27 | 2018-05-22 | 西南石油大学 | A kind of compound disturbance formula standpipe vortex-induced vibration suppression device and method |
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Effective date of registration: 20231024 Address after: 201403 floor 5, building 11, No. 6055, Jinhai Road, Fengxian District, Shanghai Patentee after: Shanghai Yuanzhu Engineering Consulting Co.,Ltd. Address before: 411105 Hunan province Xiangtan City Yuhu District West of donkey pond Patentee before: XIANGTAN University |
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