82 results about "Active heave compensation" patented technology

The present invention represents a procedure for compensating the heave movement of offshore cranes. The dynamic model of the compensation actuator (hydraulically operated winch) and the load hanging on a rope are derived. Based on this model, a path-tracking control unit is developed. To compensate the movement of the ship/watercraft caused by waves, the heave movement is defined as a time-varying disturbance and is analyzed with respect to uncoupling conditions. With a model expansion, these conditions are satisfied, and an inversion-based uncoupling control law is formulated. To stabilize the system, an observer is used for reconstructing the unknown state by means of a force measurement. Furthermore, the compensation efficiency can be improved by predicting the heave movement. There is proposed a prediction method in which no ship/watercraft models or properties are required. The simulation and measurement results validate the heave compensation method.

The invention discloses an active heave compensation control system comprising a lifting reel, a ship attitude motion sensor, an absolute value encoder, a tension sensor and a compensation unit. The lifting reel is arranged on an offshore crane, a load is suspended by a wire rope which stretches from the lifting reel and goes across a suspension fulcrum at the front end of a support arm, and the load in immersed in water. Real-time detection of heave movement of the ship is performed by the ship attitude motion sensor. Real-time detection of movement of the lifting reel is performed by the absolute value encoder. Real-time detection of dynamic tension of the wire rope is performed by the tension sensor. The compensation unit is connected to the ship attitude motion sensor, the absolute value encoder and the tension sensor. Predictive parameters are calculated by the compensation unit based on historical data and real-time data of the heave moment of the ship, the movement of the lifting reel and the dynamic tension of the wire rope; and compensation voltage is provided for the lifting reel based on the predictive parameters. The invention also discloses an active heave compensation control method.

The invention discloses a crane device with a three-degree-of-freedom active heave compensation function and a compensation method in the ship field. A circular movable platform is arranged over a circular fixed platform. Three servo cylinders which are distributed uniformly in the circumferential direction are connected between the circular fixed platform and the circular movable platform. Each servo cylinder is provided with a linear displacement sensor. A stand column fixedly connected with the circular movable platform is arranged on the lowermost portion of the crane device. The upper end of the stand column is connected with the rotating end of a crane jib through a hinge pin. A hydraulic motor is fixedly arranged at the rotating end of the crane jib. An angular displacement sensor is arranged on the hydraulic motor. Movement posture values are measured through a posture sensor. The movement values of the three servo cylinders and the hydraulic motor are worked out through a movement controller according to the movement posture values. The inverse values of the movement values are compensation values. Real-time compensation for rolling and pitching of a ship is achieved through the three servo cylinders, real-time compensation for heaving is achieved through the hydraulic motor, and therefore lifting tasks can be executed safely and efficiently under severe sea conditions.

The invention discloses an active heave compensation control system comprising a ship kinematic parameter detection module, a DSP control module and an execution module, wherein the kinematic parameter detection module comprises an accelerated speed sensor, a dip angle sensor, a first rotary encoder, a second rotary encoder and a signal conditioning circuit; the execution module comprises a main hydrauservo system, a secondary hydrauservo system and a differential planetary drive windlass. The invention has the following characteristics: 1. a feedback control mode is combined with a feed-forward control mode; 2. the active compensation of weight lowering speed is realized by detecting and predicting the ship kinematic parameter; 3. the heeling movement and the trimming movement of the ship are converted into heaving movement by the dip angle sensor to realize the heave compensation in three degrees of freedom, namely, heeling, trimming and heaving; and 4. the differential planetary drive windlass is used to realize speed composition of the feedback control and the feed-forward control.

The invention discloses a hydraulic driving system for an active heave compensation crane, which consists of an oil tank, a hoisting oil passage which comprises a hydraulic motor and is used for hoisting a heavy object and a compensation oil passage which comprises the hydraulic motor and is used for heave compensation; and the hydraulic motors in the hoisting oil passage and the compensation oil passage commonly drive a winch of the crane to rotate through a speed reducer. The system is characterized in that, 1) the hoisting of the heavy object and the heave compensation do not interfere with each other, a compensation loop can be closed under the situation of no sea waves, and then the whole system has the same functions with the ordinary crane; and the compensation loop can be opened under the situation of greater sea waves, and then the hoisting with the heave compensation can be carried out; 2) the precision of heave compensation is high; 3) the flexibility of the system is adjustable; and 4) the system is safe and reliable, and the two oil passages use the combination of two-way balance valves, thereby preventing the heavy object from sliding off.

The invention discloses an electrically-driven active heaving supplementing type marine winch. The electrically-driven active heaving supplementing type marine winch comprises a cable coiling and uncoiling system, an automatic cable arranging system, a braking system and an active heaving supplementing system; the cable coiling and uncoiling system comprises a coiling block supporting bottom frame, a coiling block and a main transmission system; the main transmission system is mounted at one side of the coiling block, and while a brake disc is arranged at the other side of the coiling block; the braking system is arranged on the brake disc; the automatic cable arranging system is positioned at the back of the coiling block; the active heaving compensating system is respectively connected with the active transmission system, the automatic cable arranging system and the braking system. According to the marine winch, an AC variable frequency electrically-driven single-shaft structural form is adopted; compared with the traditional hydraulic-driven winch, the electrically-driven active heaving supplementing type marine winch has the characteristics of being convenient to operate, fast to lower down and lift, small in noise, small in size, compact in structure, high in energy conversion efficiency, and free of environmental pollution and damage.

The invention discloses a heave compensation simulation test device for deep-sea mining. The outer ring of a gimbal frame device (2) is connected with the upper platform of a mining ship movement simulator (1); the inner ring of the gimbal frame device (2) is connected with an active heave compensation device (3); an attitude sensor (6) is mounted on the upper platform of the mining ship movement simulator (1); a cylinder displacement sensor (7) is mounted on the cylinder of the mining ship movement simulator (1); a heave compensation device displacement sensor (5) is connected with the active heave compensation device (3); a simulation pipe system (4) is connected with the active heave compensation device (3); the signal output ends of the attitude sensor (6), the cylinder displacement sensor (7) and the heave compensation device displacement sensor (5) are connected with the input end of a controller (8); and the output end of the controller (8) is connected with the control ends of the mining ship movement simulator (1) and the active heave compensation device (3). The invention can achieve the performance testing of the heave compensation simulation test device for deep-sea mining, thereby providing the basis for the design of the heave compensation system for deep-sea mining.

The invention discloses an active wave compensation control system and method based on wave trend judgment. The system comprises a sensor network, a hydraulic drive system and a wave compensation controller, wherein the wave compensation controller comprises a PLC; an MRU of the sensor network is utilized by the system to measure ship moving parameters; the MRU and the acoustic wave meter are coupled to obtain the wave motion parameters; a rotary encoder is utilized to measure the motor rotation speed and obtain load motion parameters; the PLC analyzes the motion parameters so as to obtain motion situations of ships, load and waves relatively to the static seal level, namely, a reference system by taking the static sea level as motion parameters is used for solving the issue of mutual coupling of the ships, load and waves; water entry (or water exit) opportunity is selected for analyzing the wave parameters and judging the wave trend by the PLC, and the water entry (or water exit) process is controlled by controlling the motion of the hydraulic driving system, so that the safety and the stability of the offshore hoisting operation are improved.

The present invention relates to an electric active heave compensation winch system in the special vessel technology field. The electric active heave compensation winch system comprises a cable arrangement mechanism disposed on a cable, a heave measuring unit for measuring heave velocity and accelerated velocity of a suspension point on a suspension point mechanism, a winch driving unit connected with a winch motor, a winch controller, and an energy processing unit used for energy recovery and utilization. Motion parameters of a vessel in a future short period are actively predicted based on history data and vessel heave motion data detected in real time, feedforward control of vessel motion velocity prediction is calculated, and feedback control of relative velocity of a load and the vessel and feedback control of position drift are simultaneously calculated.

The present disclosure relates to a crane controller for a crane which includes a hoisting gear for lifting a load hanging on a cable, with an active heave compensation which by actuating the hoisting gear at least partly compensates the movement of the cable suspension point and/or of a load deposition point due to the heave, and an operator control which actuates the hoisting gear with reference to specifications of the operator, wherein the division of at least one kinematically constrained quantity of the hoisting gear is adjustable between heave compensation and operator control.

The invention provides a hybrid mechanism-based kinematic solution method for active wave compensation systems. The method comprises the following steps of: in an inverse kinematic process, solving aposition and a posture, in a space, of a mobile platform through a pose parameter of a target point at the tail end of an upper platform, solving the displacement of each rod length, namely, each mobile pair, and inputting an obtained joint motion amount into a compensation platform controller to realize motion control; and in a forward kinematic process, solving a direction cosine matrix and a position vector, in a static coordinate system, of a mobile coordinate system through 6 input rod lengths, a constraint equation of the rod lengths and a system of simultaneous equations, solving a homogeneous transformation matrix at the tail end of an accommodation ladder of the upper platform, and inputting an obtained pose, in the space, of the tail end of the accommodation ladder into the compensation platform controller to realize motion control. The method is capable of enabling the calculation process to be relatively rapid, simple, correct, efficient and convenient to apply, providing basis for the motion control of active wave compensation systems, and satisfying the work demands of the active wave compensation systems of engineering.

The invention designs a sea wave active compensation system of a hybrid mechanism. The sea wave active compensation system of the hybrid mechanism can detect a posture and a displacement of a maintenance ship after the maintenance ship is affected by sea waves, and active compensation of the sea waves can be achieved by controlling the hybrid mechanism. The sea wave active compensation system of the hybrid mechanism includes a hybrid mechanism, a detection system, a motion control system and an electric system; the hybrid mechanism includes an upper platform and a six-freedom degree parallel platform, and is an execution mechanism of the sea wave active compensation system, and an execution element adopts a hydraulic cylinder and a hydraulic motor; the detection system is used for detecting a position and a posture change parameter of the ship and a state parameter of the hybrid mechanism, and providing control information feedback for the control system; the motion control system canprovide real-time control quantity for the hybrid mechanism according to the parameters detected by the detection system through model calculation and motion control computing; and the electric systemcan provide a stable energy electric power for the whole mechanism, and can achieve man-machine information connection and system parameter real-time monitoring and so on.

The invention discloses a novel heave compensation system and method for an offshore crane. The novel heave compensation system comprises a lifting device, a heave compensation execution device, a controller and a ship heave motion simulation system, wherein the heave compensation execution device is hung on the lifting device, the ship heave motion simulation system is installed below the heave compensation execution device, and the lifting device, the heave compensation execution device and the ship heave motion simulation system are controlled by the controller to achieve matching between the heave compensation execution device and the ship heave motion simulation system. The novel active heave compensation device installed between a lifting hook and cargoes is convenient to disassemble or assemble, wide in application range and high in transferability.

The invention relates to an active heave compensation system of an underwater robot. A hydraulic winch is fixedly connected to a deck of a mother ship, an armoured cable is wound on a winding drum of the hydraulic winch, the armoured cable is connected with a combination of a relay and the underwater robot through a fixed pulley, a sensor module is fixedly installed on the fixed pulley and sequentially connected with a signal processing module, a control unit, a hydraulic driving system and the hydraulic winch. An existing hydraulic take-up and pay-off winch can be utilized for the active heave compensation system, additional power equipment does not need to be arranged, and the work space for the deck of the mother ship does not need to be enlarged either. Besides, because the rotation range of the hydraulic winch is wide, the compensation range is wide; meanwhile, violent collision between the underwater robot and the relay is avoided in the releasing or retracting process. Compared with a passive compensation mode of a pneumatic-hydraulic energy accumulator, the active heave compensation system of the underwater robot has the advantages that heave compensation efficiency can be effectively improved, and the active heave compensation system is easy to operate, convenient to obtain in the respect of engineering and capable of being applied to high-precision heave compensation under significant sea conditions.

A low inertia permanent magnet motor includes a stator and rotor. The rotor includes a generally tubular and hollow rotor body coupled to the shaft of the motor by one or more spokes and/or webs. The permanent magnets of the rotor are coupled to the rotor body. In some embodiments, the low inertia permanent magnet motor may be used to power a drawworks. In some embodiments, the drawworks may be controlled by an active heave compensation controller.

The invention relates to a movable type active heave compensator and a working method thereof, which are mainly applied to the marine operation fields of ship supply, deep sea fishing, seabed installation and the like. The movable type active heave compensator mainly comprises an equidifferent hydraulic cylinder, a bidirectional quantitative pump, a servo motor, a controller and a power source, wherein the controller is connected with the servo motor to receive an outside signal and control the starting, stopping and rotation speed of the servo motor; the servo motor is connected with the bidirectional quantitative pump to control the pumping of the bidirectional quantitative pump; the equidifferent hydraulic cylinder comprises two containing cavities, one containing cavity is connected with a piston rod, and both ends of the bidirectional quantitative pump are connected with the two containing cavities through oil lines; the power source is used for supplying power for the device. Themovable type active heave compensator has the advantages that the movable type active heave compensator can be installed between a steel wire rope and a load rope of a crane to automatically and quickly compensate for the heave movement of the load in the ascending and descending process, the safety in lifting operation is improved, the compensation precision is high, the response speed is quick,the structure is simple, the cost is low, the energy consumption is low, the flexibility and convenience in use are realized, and the movable type active heave compensator can be instantly installedonce being installed.

The invention discloses a hydraulic cylinder type semi-active heave compensation device for a crane. The hydraulic cylinder type semi-active heave compensation device is applied to a deepwater crane and comprises a passive compensation system, an active compensation system and a hydraulic cylinder pulley system. According to the hydraulic cylinder type semi-active heave compensation device for the crane, two parallel pulley blocks are mounted at one end of a piston rod stretching-out part, so that the compensation capacity is improved by four times, the compensation speed is decreased to be a quarter of the compensation speed in the prior art, and the collision influence caused by an excessively high speed is reduced. When a passive compensation way is adopted, a rod cavity of a passive compensation cylinder is connected with a rodless cavity of a compensation cylinder through an oil pipe, a rodless cavity of the passive compensation cylinder is connected with a gas cylinder and an air pressurizing system, and thus most heave displacement is compensated; and when an active compensation mode is adopted, a tension sensor is arranged at the position where a mooring rope passes, an analog signal for tension changes of the mooring rope is transmitted to a controller, a piston rod of the active compensation cylinder is controlled to move by controlling a valve element of an electro-hydraulic proportional reversing valve, and finally accurate compensation is achieved. In this way, the hydraulic cylinder type semi-active heave compensation device for the crane has the advantages that energy consumption is low, the precision is high, and the compensation amplitude is large.

The invention discloses a semi-active heavy compensation device control system. The control system comprises a controller, an active-compensation control assembly, a passive-compensation control assembly and a compensating cylinder assembly; the compensating cylinder assembly at least comprises active compensating cylinders and passive compensation cylinders; the controller is connected with the active-compensation control assembly and the passive-compensation control assembly, the active-compensation control assembly is connected with the active compensating cylinders, and the passive-compensation control assembly is connected with the passive compensating cylinders; and the passive-compensation control assembly is used for controlling hydraulic pressure values in the passive compensating cylinders, the controller is used for monitoring control of the passive-compensation control assembly to the hydraulic pressure values of the passive compensating cylinders, and sends a control command to the active-compensation control assembly by utilizing a monitoring result, and the active-compensation control assembly is used for controlling hydraulic pressure values of the active compensating cylinders according to the control command, so that passive compensation can be achieved through the passive-compensation control assembly and the passive compensating cylinders, and auxiliary compensation can be achieved through the active-compensation control assembly and the active compensating cylinders to improve the compensation precision.

The invention discloses an active heave compensation device for an air winch and a control method thereof. The active heave compensation device comprises a winch status detector, a flow and direction regulator and a heave compensation controller; the winch status detector comprises an acceleration sensor, an inclination sensor, a cable length sensor, a tension sensor and the like; the heave compensation controller is a core part of the whole device and composed of a CPU module, a communication module, an A/D acquisition module and a D/A output module; the flow and direction regulator is mounted at the front end of an air inlet of a pneumatic motor on the air winch, and composed of an air suction switching valve, a flow proportional regulating valve, a flow sensor, a cable retracting switching valve and a cable deploying switching valve. The active heave compensation device for the air winch is reasonable in structural design, and may control deploying and retracting of a cable and heave compensation for the air winch through the controller, and thus is suitable for operations of ocean platforms and port wharfs; as a result, the work fields of the air winch are expanded.

The present invention relates to a sunken vessel salvage hydraulic lifting and semi-active heave compensation simulation test platform which is used to simulate synchronous lifting of double barges. Asunken vessel lifting system is provided with compensation lifting mechanisms and lifting mechanisms, and the compensation lifting mechanisms are the same as the lifting mechanisms in quantity to facilitate a contrast experiment; each two-degree-of-freedom simulation motion platform is provided with two power oil cylinders and one stand column, the two power oil cylinders and the stand column aredistributed in an isosceles triangle shape to simulate rolling and pitching of barges in sea waves and to be closer to a real salvage condition; the lifting mechanisms are provided with unidirectional locking mechanisms to lock unidirectional sliding of steel wire ropes so as to prevent the steel wire ropes from sliding back in the lifting process, prevent the steel wire ropes from winding through adoption of a take-up device and guarantee the test safety; and a sunken vessel simulation caisson is of a mesh-type cavity structure, modularization counter weights can be put in the mesh-type cavity to facilitate regulation of a tonnage, and the sunken vessel simulation caisson is put at a real water area to accord with the real sunken vessel state.

The invention provides a deep sea crane active heaving compensation controller and a control system. The deep sea crane active heaving compensation controller has a double-loop control structure. Theouter loop control structure is an active-disturbance-rejection controller, which is used to compensate outer disturbances, and is used to generate an expected angle for an inner loop. The inner loopcontrol structure is an equivalent saturation model prediction controller, which is used to compensate an input saturation and dead zone characteristic of a hydraulic motor, and therefore the hydraulic motor is guaranteed to drive a winch to track the expected angle quickly and accurately.