91results about How to "Suppression of vortex induced vibration" patented technology

The invention discloses an underwater stand pipe vortex induced vibration inhibiter adopting a rotatable cowling, belonging to the technical field of ocean stand pipe facility laying. In the invention, the rotatable cowling capable of changing own direction along with the current flow direction is installed on an underwater stand pipe and comprises a pair of rotating modules, a cowling fixing pad and a cowling. The inhibiter is characterized in that the front part of the cowling is round, the rear part of the cowling is pointed, the surface of the cowling is smooth, and the shape of the cowling is similar to a water drop. The circular arc part of the cowling is coaxial to the stand pipe and is connected with a main pipe by the rotating module which is convenient to install and disassemble to cause the circular arc part to freely rotate around the stand pipe. A small-density buoyant material is added in the hollow part of the cowling, and the structural deformation and pivoting friction resistance brought by the asymmetric gravity of the cowling can be eliminated. Because of effectively inhibiting vortex induced vibration, the underwater stand pipe vortex induced vibration inhibiter can improve the fatigue resistance of the underwater stand pipe, thus greatly lowering the engineering cost. Meanwhile, the inhibiter overcomes limitation on incoming flow directions by various vortex induced vibration inhibiters, and has high application value in the environments with frequently changed flow directions of oceans, rivers and the like.

The invention provides an active vortex-induced vibration suppression device, belonging to the field of vortex-induced vibration suppression devices for marine risers. The device comprises a fixed seat, two vane rotators, a rotating seat, a rotating seat cover, an external guide plate, an internal guide plate and a transmission shaft, wherein the two vane rotators are installed on the fixed seat of a limiting hoop device; the rotating seat and the rotating seat cover are connected through bolts and are installed on the fixed seat of the limiting hoop device; the gear end of the transmission shaft is meshed with the gear ends of the vane rotators; the middle part of the transmission shaft is combined with a bearing and installed on a support seat; the support seat and a support seat cover are connected through bolts; an impeller is installed at the smooth end of the transmission shaft through a key groove and nuts and arranged in a pump barrel; a cover board is connected with the pump barrel of the impeller through bolts; the external guide plate is articulated with the rotating seat; and one end of the internal guide plate is embedded at the inner side of the external guide plate, and the other end of the internal guide plate is articulated with a push rod. The active vortex-induced vibration suppression device is skillful in structural design, high in application value, and capable of better suppressing vortex-induced vibration of marine risers at high and low flow rates.

The invention discloses a marine riser vortex-induced vibration suppression device. The marine riser vortex-induced vibration suppression device is arranged on a marine riser. The marine riser vortex-induced vibration suppression device comprises a V-shaped front end panel and a tail fin type fairing. The V-shaped front panel board is arranged on the side, facing the marine current direction, of the marine riser. The tail fin type fairing is arranged on the side, back to the marine current, of the marine riser. The cross section of the V-shaped front end panel is V-shaped, and is tangent to the surface of the marine riser. The marine riser vortex-induced vibration suppression device has the advantages that by arranging V-shaped wing boards on the V-shaped front end panel, swinging in a small range can be achieved along with the current, incoming flow is led to be scattered, meanwhile resistance force on the marine riser due to the incoming flow can be lowered, the vortex-induced vibration can be effectively suppressed, lift force is greatly lowered, and the fatigue life of the riser is prolonged; the vortex-induced vibration suppression device has the advantages of being simple in structure, and convenient to process and install due to blocking.

The invention relates to a sieve hole air-jetting vortex-induced vibration suppression device and method. The sieve hole air-jetting vortex-induced vibration suppression device is characterized by comprising an air injection pipe, a U-shaped flow guide bent pipe, a bottom air exhaust sieve pipe, an air exhaust sieve pipe, a top air exhaust sieve pipe, an air distribution plate, a base plate and a top plate, wherein the air exhaust sieve pipe is arranged outside a water isolation pipe in a sleeved mode, the air injection pipe leads high-pressure air flow into an annular space between the air exhaust sieve pipe and the water isolation pipe through the U-shaped flow guide bent pipe, the air flow flows out from air exhaust holes in the air exhaust sieve pipe, a seawater streaming boundary layer on the surface of a pipeline is damaged, formation of vortexes of the tail of the pipeline is interfered, and vortex-induced vibration is effectively suppressed. The sieve hole air-jetting vortex-induced vibration suppression device and method can deal with flow in different directions, is not corroded or damaged easily, is put in along with the water isolation pipe in the on-site construction process, does not affect the normal construction process, can be recycled after construction, and saves cost.

The invention relates to a method capable of effectively inhibiting the vortex-induced vibration of a deepwater drilling riser. In the method, a buoyancy-block distribution scheme is optimized according to the influence rule of a buoyancy-block distribution form for the vortex-induced vibration fatigue characteristic of a riser system, i.e. buoyancy singles and naked singles are configured in a staggered manner from top to bottom according to the proportion of 1:3 to promote the response frequency of the deepwater riser system to be together controlled by buoyancy blocks and the riser and avoid the vortex-induced vibration of the system. The method for inhibiting the vortex-induced vibration of the deepwater drilling riser provided by the invention can effectively inhibit the vortex-induced vibration of the riser without installing an additional vortex-induced vibration inhibiting device, shortens the working cycle, saving the drilling cost and realizes the unification of safety and economical property.

The invention belongs to the technical field of laying of marine risers and relates to a method for inhibiting vortex-induced vibration of a marine riser. The method comprises the following steps: (1) manufacturing a plurality of pairs of semi-circular ring-shaped shells of the same size according to the size of the outer diameter of the marine riser, wherein spiral strakes and spiral grooves arearranged on the outer surface of each shell in a staggered manner, when each pair of shells are combined into an annular column, and the spiral strakes or the grooves distributed on the outer surfaces of the two shells are combined into a spiral structure; and (2) fixedly mounting one pair of shells in the radial direction of the marine riser at intervals, wherein the two shells are closely jointed on the surface of a pipeline, a sleeve is formed in a way of combining the spiral strakes or the grooves on the outer surfaces of the two shells into the spiral structure, and the sleeve is fixedlyconnected to the marine riser. By adopting the method, the vortex-induced vibration of the marine riser can be effectively controlled, and the unification of economy and safety can be realized.

The invention relates to a method for inhibiting the vortex-excited oscillation of a submarine pipeline. The method comprises the following steps: (1) fabricating tongue-like flow-guiding sheets of different sizes and curvatures according to the inner and outer diameters of the submarine pipeline to be protected, allowing each sheet to be tapered from the bottom to the top, forming a square wave-shaped notch at the bottom edge of each sheet, fixing a Z-shaped trip wire on the outer wall of each sheet, and allowing the square wave-shaped notches of the sheets in pair to be engaged with each other; (2) assembling and fixing flow-guide shields on the submarine pipeline at a distance 1.5-2.5 times of the outer diameter of the submarine pipeline, wherein each flow-guide shield is formed by two flow-guide sheets by assembly and welding, forming two symmetric shell bodies with raised middle part and two interconnected top ends, so that the submarine pipeline is enclosed therein. The inventive method can efficiently control the vortex-excited oscillation and simultaneously control the construction complexity and cost in an acceptable range, and realizes the optimization of construction complexity, construction cost and inhibitory effect on vortex-excited oscillation.

The invention relates to a propeller type synchronous power generating and vibration suppression device and method with piezoelectric panel. The device comprises a rotating module and a conductive module. The conductive module comprises a spiral coil, a conductive ring coil, a ring coil fixing plate, a fixed plate upper clamp, a fixing plate lower clamp, connecting conductors, output conductors and a coil sleeve. The rotating module comprises a blade outer sleeve, a rotating bearing, an embedded magnetic tape blade, a piezoelectric panel, piezoelectric panel conductors and a rotating clamping hole. The rotating module rotates around a vertical pipe under the flushing of sea waves to achieve the cutting of magnetic induction lines and the deformation of the piezoelectric panel simultaneously to generate electric current. At the same time, when the embedded magnetic tape blade and the piezoelectric panel rotate, the flow field surrounding the vertical pipe is undermined, the separation of boundary layers and the generation of vortexes are interfered, therefore the vortex induced vibration is inhibited, the device and method hit two birds with one stone.

The invention discloses a surrounding body and equipment for inhibiting vibration of an enclosure protection structure and a method for hoisting a tower drum. The surrounding body can surround the enclosure protection structure, faces the outer surface of the inner side of the enclosure protection structure and is provided with a plurality of elastomers which extrude the enclosure protection structure under the action of an upwind inflow, and during extrusion, an airflow scaling flow passage is formed among the elastomers; and an airflow in the scaling flow passage has the air blowing function to the upper enclosure protection structure boundary layer, so that the airflow, on the upper side, flowing around the wall of the enclosure protection structure is interfered, the boundary layer at the position is destroyed, and formation of a Karman vortex street is inhibited and destroyed. According to the technical scheme of the invention, the natural force is fully utilized, and in the premise of greenness and environmental protection, the optimal turbulent flow breaking effect is achieved, the phenomenon of the Karman vortex street is inhibited, occurrence of vortex-induced vibration is hindered, or vibration is reduced.

The invention discloses a marine riser vortex-induced vibration abatement device. The marine riser vortex-induced vibration abatement device comprises a V-shaped front end panel and a V-shaped back end panel; the V-shaped front end panel is installed on the face, facing the ocean current flowing direction, on a marine riser, and the V-shaped back end panel is installed on the face, back to the ocean current flowing direction, on the marine riser; the cross section of the V-shaped front end panel and the cross section of the V-shaped back end panel are in V shapes, and the V-shaped front end panel and the V-shaped back end panel are in tangency with the surface of the marine riser. The marine riser vortex-induced vibration abatement device has the advantages that as a V-shaped wing plate is installed on the V-shaped front end panel, small-amplitude swing can be performed along with water flow, the resistance of the coming flow to the marine riser can be reduced while the coming flow is guided to be scattered, the vortex-induced vibration is effectively abated, and the fatigue life of the riser is prolonged.

The invention discloses a spiral fluid disturbance and vibration suppression device for a marine riser. The spiral fluid disturbance and vibration suppression device comprises a riser (12), a plurality of sections of riser sleeves (14) which are sequentially connected are arranged on the outer surface of the riser (12) in a nested manner; each section of the riser sleeve (14) is provided with three spoiler groups (6) which are welded at equal intervals; each spoiler group (6) comprises a plurality of spoilers (5) which are distributed in a spiral line shape; and the spacing distance between any two adjacent spoilers (5) in each spoiler group (6) is equal. The disclosed spiral fluid disturbance and vibration suppression device for the marine riser can effectively suppress the fact that vortex-induced vibration of the marine riser occurs, has the characteristics of good omnidirectional vibration suppression efficiency and good resistance performance, and has the advantages of great practical significance.

The invention discloses a breathing unit flow control device based on large-span bridge wind field three-dimensional spreading disturbance. The device comprises a breathing unit pipeline, variable frequency axial flow fans and rectification honeycomb devices. The breathing unit pipeline is arranged sharp corners, close to the front edge side and rear edge side, of the bottom of a main beam. Breathing units are arranged at equal intervals in the breathing unit pipeline. The two ends of the breathing units are provided with air suction ports and air blowing air ports correspondingly. The variable frequency axial flow fans are arranged inside and are used for providing suction and blowing flow. The rectification honeycomb devices are arranged at the air ports to form uniform flow. According to the device, the two different effects of air suction and air blowing are generated at the two air ports of a pipeline by adopting a fan, the breathing unit is used as a disturbance source to inhibitthe formation and development of wake large-scale spanwise vortex, and main beam wind-induced vibration is controlled. The breathing units are arranged at certain intervals in the spreading direction, and three-dimensional spreading disturbance control is carried out on a flow field, so that the occurrence of vortex-induced vibration can be effectively inhibited or weakened, and meanwhile, the main beam flutter critical air speed can be effectively increased.

The invention discloses a vortex-induced vibration suppression device and method capable of being quickly assembled and disassembled. The device mainly comprises an automatic winding-unwinding storagewinch and the like. The automatic winding-unwinding storage winch is coaxially arranged on an armored cable in a sleeving mode and moves in the axial direction. A flow guide ribbon is wound and stored in the automatic winding-unwinding storage winch, the two tail ends of the flow guide ribbon are fixed to the armored cable through hoops, a rope arrangement rotating ring and a belt rope rotating ring are coaxially installed on the automatic winding-unwinding storage winch, and the flow guide ribbon is guided, positioned, released and recycled through the rope arrangement rotating ring and thebelt rope rotating ring. Vortex-induced vibration suppression effects of the diversion ribbons and the spiral strakes are comprehensively used, and vortex-induced vibration of the armored cable in water can be effectively suppressed; quick assembly and disassembly and high use efficiency are achieved; the spiral angle and the screw pitch formed by the diversion ribbons on the armored cable can beadjusted at any time, so that the applicability is high; the flow guide ribbon covers the armored cable by 360 degrees; and the vortex-induced vibration suppression device is also suitable for marinerisers, marine platform jackets and other cylindrical structures in ocean engineering and used for suppressing vortex-induced vibration.

The invention provides a double-spin vortex breaking device for inhibiting vortex-induced vibration of a steel tube high-rise structure. The device comprises two annular bases which are arranged parallelly and vertically, and the outer wall of each base is rotationally sleeved with an annular rotating arm; the outer wall of each rotating arm is fixedly provided with four connecting arms, and the connecting arms are arranged uniformly around the axes of the rotating arms; the upper and lower bases are fixedly connected through rectangular plates, one edges of the rectangular plates are fixedlyconnected with the connecting arms of the upper and lower bases, the corresponding other edges of the rectangular plates are provided with two rotating rods, and the two rotating rods are parallel tothe connecting arms; one ends, away from the rectangular plates, of the rotating rods are rotationally provided with connecting rods, and the other ends of the connecting rods are fixedly provided with four hemispherical shell-shaped wind cups respectively. In short, the double-spin vortex breaking device has the advantages that the vortex-induced vibration of the steel tube high-rise structure generated in the transverse wind direction is inhibited, the safety of the steel tube high-rise structure is improved, and the economic loss is reduced.

The invention provides an active flow controller for suppressing vortex-induced vibration based on deep reinforcement learning and a control method. According to the active flow controller disclosed by the invention, a deep reinforcement learning decision-making agent is established based on a Soft Actor-Critic algorithm, and a robust real-time control strategy is output through continuous interaction with a flow environment. A reward and punishment function related to a vortex-induced vibration state in a cylinder transverse flow direction and cylinder surface resistance is established, an artificial neural network weight in a decision-making agent is dynamically learned and adjusted, and a mapping relation from flow states such as flow environment speed and pressure to control actions is established, so that the active flow controller is obtained. The active flow controller is used for controlling the air suction and blowing devices symmetrically installed on a cross flow pole of a cylinder, and the two control targets of vibration suppression and resistance reduction of the cylinder can be achieved.

The invention discloses a casting mold for a vortex-induced vibration suppression device. The casting mold comprises an underframe, a rotating tilt stand, a female die, a female die support, a male die, a male die support, a rotating mechanism, a pressing mechanism, a hydraulic station, a heating device and the like; the female die consists of a semicircular female mold with a spiral groove, and a built-in heating coil; the male die consists of a semicircular male mold; the rotating mechanism and the pressing mechanism are hydraulic power mechanisms to control the rotating tilt stand and the male mold to oscillate; the mold comprises two sets to realize the casting of two parts of the vortex-induced vibration suppression device; and finally the two half parts are assembled into a molded product of the vortex-induced vibration suppression device.

The invention provides a tower frame vibration damping device and a tower frame comprising the tower frame vibration damping device. The tower frame vibration damping device comprises a supporting system, wherein the supporting system comprises a supporting rod and a first connecting block, the supporting rod is fixed on the surface of a tower frame through the first connecting block; the tower frame vibration damping device further comprises a pull rope, a damper module and an anchor pile system fixed on the ground, wherein the supporting system, the pull rope, the damper module and the anchor pile system are connected in sequence. According to the tower frame vibration damping device and the tower frame comprising the tower frame vibration damping device, the supporting system, the pullrope, the damper module and the elastic system are combined to use, so that the effects of jointly restraining the vortex-induced vibration and the random vibration of the tower frame are achieved, meanwhile, the stability of a wind turbine is improved by the horizontal and vertical tension provided by the pull rope, and the whole device is small in occupied space, practical in structure, low in cost and high in construction feasibility.

The invention discloses a herringbone column power transformation frame steel tube lightning rod capable of alleviating wind-induced vibration. The herringbone column power transformation frame steeltube lightning rod comprises a herringbone column, wherein a substrate is fixedly mounted on the top of the herringbone column; the upper part of the substrate is connected with a flange plate througha bolt; a lightning rod tube body is arranged at the center of the flange plate; a plurality of reinforcing ribs are uniformly distributed on the external circumference of the bottom of the lightningrod tube body; and a spiral flow guide plate is arranged on the surface of the lightning rod tube body. According to the device, the reinforcing ribs are uniformly arranged on the external circumference of the bottom of the lightning rod tube body, so that the rigidity of a nodal region, connected with the flange plate, of the tube body can be effectively improved, and the destroy of the nodal region caused by the effect of wind-induced vibration is reduced; crossed stiffening ribs are arranged inside the lightning rod tube body, so that the rigidity of the tube body can be improved, and thewind-induced vibration of the tube body is reduced; the spiral flow guide plate is arranged on the surface of the lightning rod tube body, so that the track of coming wind can be disturbed, an eddy with stable frequency cannot be formed, and then vortex-induced vibration of the lightning rod tube body is effectively inhibited.