152 results about "Fin stabilizer" patented technology

The invention relates to a fin stabilization system adapted to minimize roll about the longitudinal axis of the boat during sharp cornering at very high speeds. In one form, equipment such as a machine gun is mounted to the bow of the boat and targets are adapted to be engaged in high-speed maneuvers when cornering and the deck of the boat is not excessively rolled whereby blocking visibility in a turn.

A marine vessel stabilizer and control including a fin having a stem extending into the hull. An arm is connected to the stem and extends towards a connector which is connected to a rod. A housing is connected to another end of the rod and a screw passes through the housing. A motor is connected to the screw and configured to rotate to rotate the fin. A controller is connected to the motor, a speed sensor, a roll sensor and a fin position sensor such that a control signal can be calculated and the position of the fin can be determined to reduce roll of the vessel both when making headway and when at rest (zero speed). When the vessel is at rest, the fin is be configured to rotate through maximum angles greater than 15 degrees from either side of a neutral position.

The invention provides an energy optimization based integrated stabilization device dual neural network self-tuning PID (Proportion Integration Differentiation) control method. The energy optimization based integrated stabilization device dual neural network self-tuning PID control method comprises establishing an integrated stabilization system model and serving the inclined angle of sea waves as the integrated stabilization system input; creating performance indexes according to the established integrated stabilization system model, wherein the performance indexes mainly comprise the roll angle variance, the fin angle saturation rate and the driving fin stabilizer system energy consumption; performing online adjustment on parameters of a PID controller through a dual neural network to implement the self-tuning of the PID parameters; adding a delay link into the PID controller under the real-time sea conditions; performing real-time adjustment on the delay time to enable the stabilization capability of a fin stabilizer and a stabilization tank to be fully achieved through an integrated stabilization system; performing real-time updating on the PID control parameters to obtain optimal PID parameter values and optimize the performance indexes of the integrated stabilization system. According to the energy optimization based integrated stabilization device dual neural network self-tuning PID control method, the requirements of the performance indexes of the ship stabilization can be met and the optimization time of the PID parameters can be saved so as to improve the practical application efficiency.

The invention provides a fuzzy neural network PID (proportion integration differentiation) control system and a fuzzy neural network PID control method for a fin stabilizer. After quantization, address mapping and CMAC storage are performed on a detected sea wave dip angle signal by a CMAC (cerebellar model articulation controller) neural network feed-forward control unit, by combining online learning of a fin angular displacement signal output by a fuzzy PID controller, CMAC operation is performed on the fin angular displacement signal and the quantized sea wave dip angle signal to obtain a fin stabilizer anti-interference offset angular displacement signal to be input into a fin stabilizer servodrive unit; a PLC (programmable logic controller) control unit is used for receiving signals detected by a velocity log and an angular velocity sensor, and the signals are output to the fuzzy PID controller after being fitted; the fin angular displacement signal processed by the fuzzy PID controller is sent to the fin stabilizer servodrive unit; the fin stabilizer is driven to rotate by the fin stabilizer servodrive unit according to the fin angular displacement signal and the offset angular displacement signal, and moreover, an angular displacement sensor is used for detecting a current fin angular displacement signal of the fin stabilizer, and the current fin angular displacement signal is sent onward to the fuzzy PID controller after the current fin angular displacement signal and the fin angular displacement signal sent by the PLC control unit are subtracted to drive the fin stabilizer to perform adaptive adjustment, and therefore, the adaptability of a control process is improved.

A method of minimizing the attitude hump phenomenon relating to a rotary wing aircraft (1) having an airframe (2) extending longitudinally from a front end (3) to a rear end (4) together with upper pitching-stabilizer means (10) and at least one lower pitching-stabilizer means (20). Under such circumstances, each lower stabilizer means (20) is placed in a wake (8) from said upper stabilizer means (10) as generated by a stream of air (7) passing through said rotary wing (5) and impacting against the upper surface (10′) of an upper stabilizer means (10).

The invention provides a flexible transverse-shaft fin stabilizer. The flexible transverse-shaft fin stabilizer comprises a fin shaft and two hydraulic cylinders, wherein the fin shaft is mounted on a flexible fin face of the fin shaft, two support structures are arranged inside the fin face, the fin shaft and a bow buttcock line of a ship are parallelly mounted on the ship, the hydraulic cylinders are controlled by a controller, cylinder rods of the two hydraulic cylinders are hinged to the two support structure, and cylinder bodies of the two hydraulic cylinders are hinged onto the ship. Whenever the ship is still or moving, the shape of the fin face can be adjusted by extension of the hydraulic cylinders, swinging can be realized to drive the fin face to transversely swing around the fin shaft so as to generate transverse torque and achieve the purpose of reducing transverse rolling. The flexible transverse-shaft fin stabilizer has the advantages of large generated lifting force, small resistance, low noise and energy loss and the like.

The invention relates to the field of shipbuilding, in particular to a lofting method of a retractable fin stabilizer shell plate. The lofting method of the retractable fin stabilizer shell plate comprises the steps of labeling a fin stabilizer center line, a fin box center line, a fin box upper structural line, a fin box lower structural line and a fin box roof line on a frame body plan; after obtaining a fin box opening projection drawing, drawing a fin box opening plane development according to the fin box opening projection drawing; and labeling the true shape of a cross head rotating transverse center line on a fin box shell plate expansion plan according to the fin box opening projection drawing and the fin box opening plane development. According to the lofting method of the retractable fin stabilizer shell plate, a fin box shell plate is simply, conveniently and rapidly unfolded; and the cross head rotating center line, the fin stabilizer center line and so on are labeled on the fin box shell plate expansion plan; and therefore, the working efficiency is enhanced.

The invention provides a novel comprehensive ship path tracking and anti-rolling optimization control method. The method comprises the steps of building a ship motion control model with a rudder angleas an input according to ship motion characteristics; selecting a prediction time domain and a control time domain, and predicting a future state of a system; converting the ship path tracking and anti-rolling problem into the optimization problem considering the combination of energy consumption and control performance, solving the optimization problem under the constraint of an actuator, and applying a first element of a solution to the system; and building a fin stabilizer control model based on a sliding mode method, and performing online estimation on an unknown part of the system through an RBF neural network method. According to the method, a ship can be enabled to track a set route, so that the steering burden of sailors can be reduced, meanwhile the rolling motion of the ship canbe reduced, the hazard of wind waves on ship safety, ship equipment, cargo safety and personnel health can be reduced, and the normal operation of ship precision instruments is ensured. In addition,the energy consumption of the ship can be reduced, so that the ship is more economical and environment-friendly.

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 and an outer element of the drive element is connected to the fin shaft. 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 in a direction perpendicular to an axis of the central shaft to interact with and rotate the outer element. A controller receives sensor readings to determine control signals to send to the motor(s) to impart rotation of the fin.

An object is to suppress the rocking motion of a vessel body with a high level of accuracy by obtaining a required lifting force. A torque calculation section 27 calculates a torque of a fin 11 based on the pressure of a hydraulic cylinder 12. This torque is inputted to an angle of attack computing unit 24 via a torque adjusting unit 28, and based on this torque, a fin angle with respect to a flow of sea water, that is, an angle of attack of the fin is estimated. Then a command generation section 23 generates a fin angle command value θ3 for matching the estimated angle of attack θ2′ with a target fin angle θ1. Based on this fin angle command value θ3, a flow rate adjusting mechanism 14 controls a flow rate Q of hydraulic fluid applied to the hydraulic cylinder 12, to thereby adjust the angle of the fin 11. Thus, the fin angle is controlled based on the angle of attack, which directly relates to lifting force.

The invention aims at providing an integrated roll stabilization controller which is applied to ship roll stabilization, can realize low energy consumption and can also achieve good roll stabilization capacity. Firstly, a ship-fin stabilizer system mathematical model and a ship-passive anti-rolling tank system mathematical model are analyzed to establish a fin stabilizer-passive anti-rolling tank integrated roll stabilization system mathematical model. Secondly, the mutual effect of a fin stabilizer and a passive anti-rolling tank is analyzed. Thirdly, a quadratic performance index is established; parameters are optimized by using a genetic algorithm; and a variable parameter PID controller based on energy optimization is designed. Fourthly, the specific experimental ship control is simulated and compared with the traditional PID control.

A tree-type fastener (10,30,40,55) includes one or more fin stabilizer bases (15,35,45,55) disposed on a shaft of the fastener. When the fastener is subjected to a pull-out force, the fins may be prevented from stacking up, buckling or bending by the fin stabilizer base. The stabilizer base is configured to provide no interference with a work piece when inserted in a work piece aperture. The fastener of the invention provides a high removal force to insertion force ratio and a strong, single piece device. The fastener may also be adapted for modification of new and existing tree-type fasteners.

Disclosed is a low speed fin stabilizer for a sand carrier. The low speed fin stabilizer for the sand carrier comprises fin stabilizers, fin shafts, and servo systems; and each fin stabilizers forms afront-narrow rear-wide trapezoid, the fin shafts are arranged at the leading edge of the fin stabilizers, and fin shafts are connected with the servo systems in the sand carrier to enable the servo systems to control the fin stabilizers to move. The low speed fin stabilizer for the sand carrier has the beneficial effects that the fin stabilizers are applied on the sand carrier, the stability of the sand carrier is enhanced, the fin stabilizers can work at a high speed and at a low speed or at zero speed, full speed reduction is achieved, and the fin stabilizers take up less space inside of aship; and the structure is simple, the volume is small, the weight is light, and the cost is low.

The invention relates to a hydraulic control system for a fin stabilizer, which comprises a two-way variable displacement pump and a pilot oil constant displacement pump, wherein the two-way variable displacement pump is respectively connected with the oil inlets of a first pilot operated check valve and a second pilot operated check valve; the oil outlet of the first pilot operated check valve is connected with a hydrocylinder oil inlet pipe; the oil outlet of the second pilot operated check valve is connected with a hydrocylinder oil outlet pipe; the hydrocylinder oil inlet pipe and the hydrocylinder oil outlet pipe are communicated to a hydrocylinder; the hydrocylinder is linked with the fin stabilizer; the pilot oil constant displacement pump is connected with the two-way variable displacement pump in series; a pressure oil duct connected with the oil outlet of the pilot oil constant displacement pump is simultaneously communicated with a control orifice of the first pilot operated check valve and a control orifice of the second pilot operated check valve; the pressure oil duct is also communicated with one oil inlet of an electrohydraulic servo valve through a first servo control oil duct; and two oil outlets of the electrohydraulic servo valve are communicated with the flow control loop of the two-way variable displacement pump. The hydraulic control system has the advantages of precise control, high response speed and safe reliability.

The invention provides a retractable hydraulic swing cylinder direct driving fin stabilizer device, which is characterized in that: a mounting seat is installed in a bilge part; The first hydraulic swing cylinder is fixedly mounted on the mounting seat and comprises a first cylinder body, a retracting rotating shaft, a first cylinder blade, a rotating shaft blade, and two oil ports; a connector, wherein a low end of that connector is fixedly connected with a retracting/releasing rotate shaft; a second hydraulic swing cylinder, which is fixedly connected with the upper end of the connector, andthe axial direction is perpendicular to the axial direction of the first hydraulic swing cylinder, and includes: second cylinder, a fin shaft oppositely disposed on the inner wall of the second cylinder, protruding toward the fin shaft and extending in the axial direction, two second cylinder blades oppositely disposed on the fin shaft, protruding toward the inner wall of the second cylinder block and extending in the axial direction, and two sets of oil ports provided on the second cylinder block corresponding to the two second cylinder blades; and a fin fixedly connected to the protruding end of the fin shaft.

The invention discloses a fin-tilting limiting device for an ultraminiature fin stabilizer. The device comprises a fin shaft fixing assembly and a ship body fixing assembly which are connected with each other, wherein the fin shaft fixing assembly is fixedly connected with a fin shaft of the fin stabilizer and can rotate coaxially with the fin shaft; the ship body fixing assembly is fixedly installed on a ship body and is kept static all the time relative to the ship body; and the ship body fixing assembly comprises an angle limiting block and a base fixing plate, the fin shaft fixing assembly comprises a pull plate and an end surface press plate, and the angle limiting block is matched with the pull plate in a positioned manner. The device has the benefits as follows: the device is purely mechanical and high in limiting reliability; and the maximum fin-tilting angle limited by the device is adjustable and can be set as required temporarily before fin stabilizer products leave factories.

The invention provides a dual-purpose fin stabilizer used at a zero speed and a certain speed. The dual-purpose fin stabilizer mainly consists of a main wing, a wing flap and a hydraulic cylinder, wherein the main wing is hinged to the wing flap through a rotating shaft; the wing flap is divided into two symmetrical parts, and the two parts are respectively hinged to the main wing; the hydraulic cylinder is fixed in the main wing; the end part of a hydraulic rod is hinged to a connecting rod; one end of the connecting rod is hinged to the hydraulic rod, and the other end of the connecting rod is hinged to the wing flap; a large rotating shaft is fixedly connected with the main wing; when the fin stabilizer works, the large rotating shaft drives the whole device to swing up and down to generate lifting force, so that stabilizing is realized; at a certain speed, the hydraulic cylinder is controlled by a control program to retract the hydraulic rod, and the wing flap is driven to close to reduce resistance; and at a zero speed, the hydraulic rod extends to enable the wing flap to be opened, so that the lifting force is enlarged. The dual-purpose fin stabilizer disclosed by the invention can work when a vessel is at a certain speed and at a zero speed, and is simple in structure, high in stabilizing efficiency, and low in flow noise; and the dual-purpose fin stabilizer is symmetrically arranged on two sides of the vessel (figures are respectively starboard), and is suitable for all kinds of vessels.

A back-retraction fin stabilizer retracting and extending mechanism is mainly used for solving the technical problems of anti-rolling performance improvement. The back-retraction fin stabilizer retracting and extending mechanism is characterized in that an adjusting plate with an adjustable thickness is assembled on a front vertical plate of a fin box; the adjusting plate is correspondingly sleeved on one end of a guide sleeve and is in contact with one end of a slide sleeve in the working position of the fin; another adjusting plate with an adjustable thickness is assembled on the rear vertical plate of the fin box on the other end of the guide sleeve and is in contact with the other end of the slide sleeve in the fin retracting position; and a radical spherical plain bearing is arranged on a retracting and extending connection rod; a rotating arm has a combination structure; and a split-type dustproof ring is adopted. The back-retraction fin stabilizer retracting and extending mechanism is suitable for various back-retraction fin stabilizers.

A fin-angle feedback device comprises a fin stabilizer, a feedback main body and a coupler, wherein the feedback main body comprises a housing, a potentiometer, a pointer and a transmission rod, wherein a notch is formed in the side wall of an upper end shaft sleeve of the coupler; the upper end shaft sleeve of the coupler penetrates a mounting opening in a baseplate to extend into an accommodating cavity of the housing; a shift lever of the transmission rod is clamped into the notch; the feedback main body is fixed to the fin stabilizer through a flange plate; a lower end shaft sleeve of the coupler is fixed to a fin shaft of the fin stabilizer in a sleeving manner. The fin-angle feedback device is simple in structure; all components of the feedback main body can be mounted on the housing of the feedback main body, so that the feedback main body can be assembled into an independent whole; the fin-angle feedback device is convenient to assemble and suitable for batch production. A mounting method of the fin-angle feedback device comprises the steps of assembling components into an integral feedback main body and then the feedback main body is directly mounted on the fin shaft through the coupler. The assembly process is simple, and the assembly time is helped to be shortened during batch production of the fin-angle feedback device.

The invention discloses a positioning method for a fin stabilizer base of a tilting slipway ship. According to the method, horizontal and vertical angle lines are marked on a preset parallel platformbased on a slipway slope and an angle of the central line of the base; an intersection point of the two lines is found out; and then a positioning reference line of the fin stabilizer base is determined finally. The method has advantages of simple operation, saved cost and high positioning precision.