51 results about "Fin stabilizer" patented technology

The invention relates to a split type electro-hydraulic direct-driven non-retractable fin stabilizer hydraulic system which comprises a hydraulic unit and an actuating mechanism which are independently arranged, and the actuating mechanism comprises fin rotating oil cylinders which are symmetrically arranged; a bidirectional hydraulic pump driven by a servo motor forms a closed fin rotating loop; the bidirectional hydraulic pump driven by the servo motor, the hydraulic unit and the actuating mechanism form an electro-hydraulic direct-drive fin stabilizer device; the control loop is composed of a gyroscope, a controller and an executing mechanism, and the gyroscope detects the rolling angular velocity of the ship and generates a fin rotating instruction signal; the controller compares the instruction signal with the fin angle feedback signal and outputs a servo motor rotating speed instruction; the servo driver controls the servo motor to rotate forwards and backwards, the bidirectional hydraulic pump is driven to adjust the displacement of the fin rotating oil cylinder, and therefore the fin is driven to rotate. A valve control or pump control type hydraulic system adopted by a traditional fin stabilizer is replaced, integrated optimization, light weight, high efficiency, high reliability and low noise of the fin stabilizer hydraulic system are achieved, and the occupied space of equipment is reduced.

The invention discloses a ship stability protection device, and relates to the technical field of ship engineering, the ship stability protection device comprises a ship main body, containing grooves are formed in the two sides of the ship main body, and main stabilization assemblies are arranged in the containing grooves; the main anti-rolling assembly comprises a main anti-rolling fin used for enhancing the stability of the ship body and a main fin driving mechanism used for driving the main anti-rolling fin to unfold or contract, a storage groove is formed in the bottom of the ship body, and an auxiliary anti-rolling assembly is arranged in the storage groove; the auxiliary stabilization assembly comprises an auxiliary stabilization fin used for being matched with the main stabilization fin to improve the stabilization effect and an auxiliary fin driving mechanism used for driving the auxiliary stabilization fin to unfold or contract, by starting the rotation driving component, the rotation driving component drives the rotation block to rotate by 90 degrees around the rotation column, the fixing frame is made to rotate out of the containing groove, and the auxiliary fin driving mechanism drives the auxiliary stabilization fin to unfold or contract. The extension length of the main fin stabilizer is changed by the linear driving part, so that the length-width ratio of the ship main body is changed, and the stabilization effect of the ship main body is improved.

The invention relates to a full-speed fin stabilizer without occupied space, and belongs to the technical field of fin stabilizers, and the fin stabilizer comprises a fin angle feedback device, a rotating vane oil cylinder, a supporting seat assembly, a rotating shaft assembly and a fin; the supporting seat assembly comprises a supporting shaft and a first rolling bearing; the supporting shaft is of a hollow shaft structure, one end of the supporting shaft is fixed to the ship body, and the other end of the supporting shaft is sleeved with the first rolling bearing and inserted into the fin to be connected with the fin. The rotating shaft assembly comprises a rotating shaft; the rotating shaft coaxially penetrates through the interior of the supporting shaft, one end of the rotating shaft is coaxially connected with the fin, the other end of the rotating shaft is connected with the rotating vane oil cylinder installed on the supporting shaft, and the rotating vane oil cylinder drives the fin to coaxially rotate through the rotating shaft. Meanwhile, the end of the rotating shaft is connected with a fin angle feedback device installed on the rotating vane oil cylinder, and the fin angle feedback device is used for detecting the angle displacement of the fin and feeding back the angle displacement to the control system. According to the full-speed fin stabilizer, a traditional fin base and an executing mechanism supporting base are integrated, the rotating vane oil cylinder is introduced, and the requirements of the full-speed fin stabilizer which is small in occupied space and large in rotating angle can be met.

The invention relates to the technical field of marine equipment, and particularly discloses a ship fin stabilizer which integrates bionic resistance reduction, intelligent control and energy recovery functions. The fins are of a layered structure of a flexible silica gel skin and a shape memory alloy wire mesh, V-shaped groove arrays are arranged on the surfaces of the fins, and the fins can be self-adaptively deformed into a U shape to reduce resistance. The driving mechanism realizes high-frequency compensation through cooperation of a hydraulic cylinder and piezoelectric ceramics; the energy recovery module converts mechanical energy into electric energy through a two-way pump-generator. According to the device, the rolling trend is predicted through the LSTM neural network, a Q-learning optimization control strategy is combined, the stabilization efficiency and energy efficiency are remarkably improved, and the device is suitable for stable control of ships under high navigational speed and complex sea conditions.

The invention relates to a test device and a control method for zero-speed rolling reduction of a ship. The test device comprises a ship model, a forced rolling device, a sensor device and a fin rolling reduction device, the forced rolling device is used for driving the ship model to generate rolling motion; the sensor device is used for monitoring attitude information of the ship model in rolling motion; the control device generates an action decision of the fin stabilization device through the strategy network; the fin stabilization device flaps to a specified angle and frequency according to the action decision generated by the control device; wherein the sensor device monitors the posture change of the ship model and the actual flapping angle of the fin stabilization device in real time and feeds back the posture change and the actual flapping angle to the control device, and the control device evaluates the effectiveness of the current strategy according to the feedback of the sensor device: if the stabilization effect meets the requirement, the current strategy is enhanced, otherwise, the strategy network is updated; and the control action of the fin stabilizer is further optimized. The test device is simple in structure and control method, and stabilization can be realized under different sea conditions and dynamic changes of ship rolling.

The invention belongs to the technical field of fin stabilizer systems, and particularly relates to a passive locking mechanism for a fin stabilizer system and a control method thereof.The passive locking mechanism comprises a locking pin, an oil cylinder body, a spring, an oil cylinder piston rod and a locking mechanism shell, the shell is installed on an executing mechanism, coaxial installation holes are formed in the two ends of the shell, the cylinder body is arranged in the axial direction of the installation holes, and one end of the cylinder body is sleeved with the spring; the piston rod is fixed in the shell, one end of the piston rod is a piston head and located in the cylinder body, the other end of the piston rod is installed in the installation hole, a sealing structure is arranged between the piston rod and the cylinder body, an oil cavity is formed between the piston rod and the cylinder body, the piston rod is provided with an oil channel, one end of the piston rod is connected with a hydraulic system, and the other end of the piston rod is communicated with the oil cavity. When hydraulic oil is input, the cylinder body is pushed to overcome spring force to pull the locking pin out of the fin handle slot, and when pressure is released, the spring resets to push the locking pin to be inserted into the slot. Automatic unlocking and passive self-locking are achieved, and the problems that manual bolt inserting efficiency is low, potential safety hazards are large, and a contact part is prone to abrasion are solved.

The present invention is a fin stabilizer for reducing shake of a sailing ship, the fin stabilizer being provided with: a fin configured so as to protrude from the hull of the ship; a rotating shaft capable of rotating the fin around the axis so as to accommodate the protruding fin in the hull; a protrusion fixed to the rotating shaft and protruding from the rotating shaft to the outside in the radial direction of the rotating shaft; and a hook including a restricting portion for restricting rotation of the protrusion and having a lower strength than the rotation shaft and the protrusion.

The embodiment of the invention provides a fin stabilizer, and belongs to the field of ship stabilization devices, the fin stabilizer comprises a fin blade made of a flexible material, and at least one hollow cavity is formed in the fin blade; when the fin blades are in the use state, the hollow cavities of the fin blades are filled with fluid through the fluid filling device, so that the fin blades are unfolded; when the fins are not used, fluid in the hollow cavity is discharged through the fluid discharging device, and after the fluid is discharged, the fins can be folded, shrunk and stored in the ship body. And the fin rotating arm is driven by the fin rotating power device to stretch out or retract the fin blades in the unused state into the ship body. The effects that the weight is reduced, and a large amount of occupied ship storage space is reduced can be achieved.

A fin stabilizer is provided for roll stabilization of a watercraft. The fin stabilizer includes a drive unit connected in a vibration-damping manner to a ship's structure. Specifically, a vibration damping element is provided between the drive unit and the hull of the watercraft wall such that a mounting portion of the drive unit is spaced from an attachment portion of the hull wall.

The application belongs to the technical field of fin stabilizer system, and particularly relates to a passive locking mechanism for a fin stabilizer system and a control method thereof, which comprises a locking pin, a cylinder body, a spring, a cylinder piston rod and a locking mechanism shell, the shell is installed on an actuator, coaxial mounting holes are arranged at two ends of the shell, the cylinder body is arranged axially along the mounting hole, the spring is sleeved at one end of the cylinder body, the other end of the cylinder body is connected with the locking pin, the spring is abutted against a cylinder body step and an inner end surface of the shell at two ends, the piston rod is fixed in the shell, one end of the piston rod is a piston head and is located in the cylinder body, the other end of the piston rod is installed in the mounting hole, a sealing structure is arranged between the piston rod and the cylinder body and an oil cavity is formed, the piston rod is provided with an oil channel, one end of the oil channel is connected with a hydraulic system, and the other end of the oil channel is in communication with the oil cavity, when hydraulic oil is input, the cylinder body is pushed to overcome the spring force to make the locking pin be pulled out of a fin handle insertion slot, and when pressure is released, the spring is reset to push the locking pin to be inserted into the insertion slot. The application realizes automatic unlocking and passive self-locking, and solves the problems of low efficiency, great safety hazards and easy wear of a contact part of manual insertion.

The invention relates to the technical field of ocean energy development and utilization, in particular to a power generation buoy capable of converting wave energy through a water turbine and a mooring method thereof.The power generation buoy comprises a floating body, a connecting rod, the mixed-flow water turbine and anti-rolling fins, the floating body is fixedly installed above the connecting rod, and the lower portion of the connecting rod is connected with the mixed-flow water turbine; the anti-rolling fins are circumferentially and evenly distributed and fixed to the surface of the whole power generation buoy, the mixed-flow water turbine is mainly composed of an upper flow guide cylinder, a rotating wheel, an inner sealing cover, an outer sealing cover and a lower flow guide cylinder which are coaxially installed from top to bottom, and the inner sealing cover is fixed to the outer side of the circumference of rotating wheel blades. The upper and lower circumferential surfaces of the inner sealing cover are fixedly connected with the end surfaces of the cylindrical shell of the upper guide cylinder and the cylindrical shell of the lower guide cylinder respectively; the upper and lower mounting end surfaces of the outer sealing cover are fixedly mounted on the upper guide cylinder and the lower guide cylinder through rubber seals. The floating body is of a float type structure, the mixed-flow water turbine is adopted, and the wave energy conversion efficiency is effectively improved through the structures such as anti-rolling fins on the outer surface.

An intelligent navigation ship active stabilizing device and a control method therefor. A shaftless rim propelling device (2) is mounted at the position of a fin stabilizer (1) close to the root of a fin, on the basis of a roll angle, angular velocity information and angular acceleration information collected by a ship attitude sensor (6) and ship navigation speed information obtained by means of a DGPS system, and by controlling the fin angle of the fin stabilizer (1) and the rotation speed of the shaftless rim propelling device (2), a resistance moment is generated to reduce the roll motion of a ship. Different control methods can be used on the basis of navigation speeds. When the ship speed is lower than a certain value, the lifting force of the fin stabilizer is reduced, and the shaftless rim propeller (2) is used to generate thrust to reduce ship roll; when the ship speed is higher than a certain value, the lifting force of the fin stabilizer is high enough, and the fin stabilizer (1) is used to generate resistance to the roll; and when the ship speed is between the two values, the fin stabilizer and the shaftless rim propeller jointly generate resistance to achieve a stabilization effect, thereby achieving a good stabilization effect from zero to full navigation speed, the applicability is wide, the consumed energy is low, abrasion is not prone to occurring, and the durability is high.

To provide a pivot column bearing for a pivotable fin stabilizer of a ship capable of enabling both the automatic compensating for a positional deviation and the reliable operation in the case of the minimum positional deviation or no positional deviation.SOLUTION: The present disclosure is the pivot column bearing for a fin stabilizer of a ship with at least one spherical slide bearing and is a fin stabilizer.SELECTED DRAWING: Figure 4

A drive device of a fin stabilizer is for pivoting a stabilizer fin about its fin shaft axis. The drive device includes a drive motor with an output shaft and a transmission including an input shaft. A fixing device for fixing the stabilizer fin in a pivot position acts directly on the transmission input shaft. A coupling is for conjoint-rotation connection of the transmission input shaft to the motor output shaft disposed at least sectionally in an interior of the motor output shaft. The coupling is connected to a free end of the transmission input shaft and has a flange connected to an annular end surface of the motor output shaft.

The application belongs to the field of ship stabilizer fins and hydraulic technology, and particularly relates to an integrated large non-retractable stabilizer fin hydraulic system and a control method thereof. The hydraulic system comprises a main pump, a motor, an auxiliary pump, a reset unlocking and servo valve group and an oil tank. A first shaft end of the motor drives a turning fin pump in the main pump to provide energy for a main circuit, and a second shaft end of the motor drives the auxiliary pump to provide energy for a servo, reset and unlocking circuit. The main pump integrates the turning fin pump, an oil supplement pump, a filter module, an oil supplement module, an overflow flushing module and a short circuit valve group. An output end of the turning fin pump and a turning fin oil cylinder of an actuator constitute a closed hydraulic circuit to realize forward and reverse turning fins. The oil supplement pump is driven by the motor, connected to the main circuit through the filter and the oil supplement module, and connected to a reset oil cylinder through a reset electromagnetic valve. The application realizes integrated lightweight design by integration and optimization, reduces hydraulic components and pipelines, controls oil temperature, improves system stability and reliability, and is suitable for the demand of large ships for high-performance stabilizer fin devices.

The invention belongs to the technical field of ship navigation control and attitude stabilization, and particularly relates to a non-contact feedback device for a ship fin stabilizer system and a control method. The angle sensor magnetic block and the induction column are fixedly installed on the bottom plate, and the magnetic block does circular motion around the rotation axis along with the bottom plate; the main body structure is fixedly connected with the fixed seat, a space used for accommodating a magnetic block of the angle sensor is defined between the main body structure and the bottom plate, the main body structure is provided with a first arc opening, and the induction column is arranged in the first arc opening and moves along a track; the main body structure is provided with a proximity switch and an angle sensor body which is opposite to the magnetic block and has an induction gap, and a signal transmission interface is electrically connected with the proximity switch and the angle sensor body. Angle induction and zero position recognition are achieved in a non-contact mode, the problems of mechanical clamping stagnation and signal drifting are solved, and the technical problems that an existing fin angle feedback device is complex in structure, a contact element is poor in reliability, and the zero position recognition precision is low are solved.

The invention belongs to the technical field of cross-medium unmanned aerial vehicles, and discloses a tandem type double-rotor cross-medium unmanned aerial vehicle which comprises a bow part, a middle fuselage and a stern part which are connected into a whole in a sealed mode through end seals. The middle fuselage is formed by longitudinally butting two fuselage sections and penetrates out of the stern end seal after penetrating through the bow end seal, the two fuselage sections and the middle end seal in sequence through a full-length bolt, and the two ends of the middle fuselage are locked through clamping plate nuts respectively. The unmanned aerial vehicle has a high gravity center mode that the motor is higher than the vehicle back and a low gravity center mode that the motor is installed in the vehicle body and provided with the fin stabilizer. The problems that an existing cross-medium unmanned aerial vehicle is low in underwater propulsion efficiency and large in navigation power consumption are solved, the problem that additional airborne equipment influences the gravity center and stability of the unmanned aerial vehicle is solved, good flight performance and underwater navigation capacity are achieved, and the diversified requirements of the civil field are met.

A vessel hull stabilization system includes a housing having a rotatable shaft mounted thereto, the shaft configured to connect to a fin such that the fin is located on an outside of the vessel hull and the housing is located on an inside of the vessel hull. A drive system is mounted to the housing and includes a motor and a drive element. The motor is connected to a central shaft of the drive element. The drive element includes a plurality of teeth positioned between the outer element and the central shaft such that when the motor rotates the central shaft, the plurality of teeth oscillate inwards and outwards to interact with teeth in the outer element and thereby cause rotation of a fin shaft connected to the outer element or to the gear having the oscillating teeth. A controller receives sensor readings to determine control signals to send to the motor(s) to impart rotation of the fin.

The invention belongs to the technical field of ship fin stabilizers and hydraulics, and particularly relates to an integrated large non-retractable fin stabilizer hydraulic system and a control method thereof.The hydraulic system comprises a main pump, a motor, an auxiliary pump, a zero resetting unlocking and servo valve set and an oil tank, the first output shaft end of the motor drives a fin rotating pump in the main pump and supplies energy to a main loop, and the second output shaft end of the motor drives a second output shaft of the motor; the second output shaft end drives the auxiliary pump to supply energy to the servo, zero resetting and unlocking loop, the main pump integrates a fin rotating pump, an oil supplementing pump, a filtering module, an oil supplementing module, an overflow flushing module and a short circuit valve set, the output end of the fin rotating pump and a fin rotating oil cylinder of an executing mechanism form a closed type hydraulic loop to achieve forward and reverse fin rotating, and the oil supplementing pump is driven by a motor. And the zero resetting electromagnetic valve is connected to a main loop through a filtering and oil supplementing module and is communicated with the zero resetting oil cylinder. Through integrated optimization, hydraulic elements and pipelines are reduced, the oil temperature is controlled, the stability and reliability of the system are improved, integrated lightweight design is achieved, and the fin stabilizer device meets the requirements of large ships for high-performance fin stabilizers.

The present application relates to the technical field of ship control, in particular to a ship fin stabilizer variable gain robust control method and system. It includes: constructing a three-layer nested working condition judgment model based on real-time navigation data, sequentially evaluating the roll energy, resonance risk and actuator capacity to determine whether to start control. The concept of virtual leader is introduced to construct a dynamic topology to coordinate the cooperative control of multiple fin stabilizer units. A multi-objective optimization algorithm is used to set the variable gain robust control parameters to balance the roll reduction effect, energy consumption and robustness. During the control process, a three-level abnormality fusing mechanism is implemented: fine-tune the parameters when there is a slight abnormality, backtrack the working condition judgment when there is a moderate abnormality, and roll back to the historical stable strategy when there is a serious abnormality. Through performance evaluation and intermittent freezing mechanism, the parameter optimization is suspended when the working condition is stable to reduce energy consumption and equipment wear and tear, and quickly recover the response when there is a mutation. The method realizes complete control from working condition identification, cooperative control, parameter optimization to safety guarantee.

The invention relates to a gearless fin stabilizer for positionally stabilizing a watercraft. The stabilizer comprises an electric motor as the drive unit and is gearlessly detachably connected to a fin shaft via a coupling.

The invention relates to the technical field of ships, in particular to a design method for a butt joint structure of a fin stabilizer base structure and a ship body, which comprises the following steps of: drawing a first view of a fin base vertical to a fin base central plane according to the structure of the fin base; according to the first view and the fin base positioning design drawing, the deviation position of the fin base relative to the ship body installation position is obtained; a rib plate is designed to connect the offset position of the fin base with the installation position of the ship body; a first connecting plate is designed, and the first connecting plate is arranged between the ship body and the fin base and used for connecting the ship body with the fin base; a second connecting plate is designed, and the second connecting plate is arranged between the ship body and the fin base and used for connecting the fin base with a rib plate of the ship body; and a connecting panel is designed, and the connecting panel is arranged between the inner bottom plate and the fin base of the ship body and used for connecting the inner bottom plate, the fin base and the second connecting plate. The construction difficulty can be reduced, and the working efficiency is improved.

The invention discloses a pivot column bearing for a fin stabilizer device of a ship and the fin stabilizer device. The pivot column bearing is provided with at least one spherical plain bearing.

The invention belongs to a ship fin stabilizer carrying positioning precision control method in the technical field of ship construction. The intersection point of the cross connecting lines of the line (2) away from the base H1 and the line (4) away from the middle B1 half width is a point C (5), and the intersection point of the cross connecting lines of the line (3) away from the base H2 and the line (19) away from the middle B2 half width is a point D (6); a half-width ground sample point E (8) is determined on the ground (7), a height level mark post (10) is arranged at the position of a ship center point (9), and a height reference point F (20) is arranged on the height level mark post (10); determining a point A (11) and a point B (12) of the fin stabilizer segmented rib plate according to the point C (5) and the point D (6); and a connecting line of the point A (11) and the point B (12) forms a fin stabilizer segmented rib plate mounting angle line (13). According to the ship fin stabilizer carrying and positioning precision control method, the steps are simple, fin stabilizer segmented rib plate carrying and positioning can be conveniently and reliably achieved, the carrying precision meets the standard requirement, and the carrying work efficiency is improved.

According to the technical scheme, the unmanned ship stabilization device comprises a fin stabilizer, the fin stabilizer comprises a fin head, a fin tail, a fin back and a fin belly, and the fin stabilizer comprises a first fin stabilizer (10) and a second fin stabilizer (11); the fin head of the first fin stabilizer is provided with a rotating axis which is called as a first axis; the fin head of the second fin stabilizer is provided with a rotating axis which is called as a second axis; the first axial lead and the second axial lead coincide on the same straight line; a mirror surface exists between the first fin stabilizer and the second fin stabilizer on the whole, that is, the first fin stabilizer and the second fin stabilizer are in mirror symmetry on the whole relative to the mirror surface, and the same straight line is located in the mirror surface.

A pivot column bearing is provided for a pivotable fin stabilizer of watercraft, the stabilizer having a column pivotable about a vertical axis. The pivot column bearing includes an upper bearing and a lower bearing, the upper and lower bearings being configured to mount the pivot column pivotably about the vertical axis. At least one of the upper bearing and the lower bearing has spherical guide surfaces.

The application provides a stabilizer fin device, which comprises an electric control system, a hydraulic system and a fin base, and further comprises a water spraying system, wherein the water spraying system is composed of a seawater suction port, a seawater conveying pipeline, a motor, a spraying pump, a hollow fin shaft, a fin plate and a water spraying port; the fin plate is a lift force generating part, the water spraying port is installed on the upper and lower panels of the fin plate, and the water flow jetted out of the water spraying port will generate a thrust force on the fin plate in direct proportion to the flow rate and flow speed of the water flow. On the basis of the conventional stabilizer fin device, the water spraying system is additionally arranged, when a fin plate on one side strikes downward, the water spraying port on the lower panel of the fin plate sprays high-speed water flow, the fin plate is subjected to the reaction force of the water flow to generate an upward force, and the upward force is superposed with the upward force generated when the fin plate strikes downward, and vice versa, so that the stabilizing moment of the stabilizer fin can be further enhanced, and the problem of poor stabilizing performance of the conventional stabilizer fin device at low speed can be solved.

The invention provides a convertible Magnus fin stabilizer propulsion system, and belongs to the technical field of ship navigation stabilization and auxiliary propulsion. The problems that in the prior art, a stabilization device and a wind propulsion device are independent of each other and cannot give consideration to each other, extra resistance is brought when the device does not work, and occupied space is large are solved. The device comprises a Magnus device, a mode conversion mechanical arm, a detection system and a control system, one end of the mode conversion mechanical arm is connected with an external ship body, and the other end of the mode conversion mechanical arm is connected with the Magnus device so that the Magnus device can be contained in the external ship body or moved to the two sides of the external ship body and the vertical plane relative to a deck of the external ship body; the Magnus device and the mode conversion mechanical arm execute different working modes respectively, the detection system is installed on an external ship body, electrically connected with the control system and used for collecting and feeding back signals, and the control system is installed on the external ship body, electrically connected with the Magnus device and the mode conversion mechanical arm and used for sending out commands. The method is mainly used for shipbuilding.

The present application belongs to the technical field of test benches for marine components, and specifically relates to a retractable and deployable fin stabilizer and a testing method thereof. The device comprises a fin handle, an electric cylinder, a telescopic oil cylinder and a slide rail. The fin handle has a central hole, and a rotating shaft is passed through the central hole. The upper end of the rotating shaft is connected to a retractable mechanism, and the lower end of the rotating shaft is rotatably connected to a mounting platform of the retractable and deployable fin stabilizer. An ear shaft mounting seat is provided on one side of the outer periphery of the fin handle, and a roller mounting seat is provided on the other side. The cylinder body of the telescopic oil cylinder is fixed on the mounting platform, and its push rod is rotatably connected to the ear shaft mounting seat. The bottom of the electric cylinder is fixed on the mounting platform, and a slide rail is installed on the top of its push rod. The roller mounting seat is slidably connected to the slide rail. The retractable and deployable fin stabilizer of the present application is based on the fluid resistance and fluid lift experienced by the fin when the fin is deployed outboard during navigation. It simulates the retractable and deployable mechanism overcoming the fluid load experienced by the fin when the fin is deployed outboard during actual navigation, and can truly and effectively verify the structural stability and retractable capacity of the retractable and deployable mechanism.

The present invention provides a method, device and equipment for detecting external load of a fin stabilizer. The method comprises: step 1, collecting t n The angular velocity of a single fin stabilizer at the moment ω(t n ), fluid attack angle #imgabs0#, oil inlet pressure #imgabs1# and oil outlet pressure #imgabs2# of the hydraulic drive cylinder used to drive a single anti-roll fin, step 2, constructing a fluid torque coefficient function; step 3, according to the fluid torque coefficient function, the fin angular velocity ω(t n ), fluid attack angle #imgabs3# oil inlet pressure #imgabs4# and oil outlet pressure #imgabs5#, the lift-drag resultant force and fluid force are solved by iteration method, and the lift-drag resultant force and fluid moment are the detected external load. The identity between the driving torque and the load torque is established, and the real-time measurement of the external load of the fin stabilizer is realized by iterative means, providing the algorithm basis for the lift feedback control of the fin stabilizer.