608 results about "Marine propulsion" patented technology

The invention relates to the technical field of ship propulsion, and discloses an energy-saving control method for a pre-rotating guide wheel of a ship propulsion system and a fluid optimization system. According to the invention, through a multi-dimensional cooperative control strategy and fluid structure optimization, an integrated system with dynamic prerotation compensation, self-adaptive flow regulation and vortex suppression functions is constructed. The control method comprises a multi-physical field sensor array, a guide wheel angle dynamic compensation algorithm and an energy efficiency optimization decision model, a deep learning algorithm is adopted to establish a mapping relation between a propeller wake flow field and guide wheel parameters, and 0.1-second-level dynamic response is achieved. According to the fluid optimization system, an asymmetric variable-curvature guide vane structure is innovatively designed, the optimal space distribution of guide vanes is determined through three-dimensional flow field simulation, and a flow guide channel with the pressure gradient self-adaptive characteristic is formed. A real ship verifies that the propulsive energy consumption can be reduced by 10%-25%, the propulsive efficiency can be improved by 15%-30%, the cavitation effect is effectively restrained, vibration noise is reduced, and remarkable economic benefits and environmental protection values are achieved.

The invention relates to the technical field of ship propulsion load prediction, in particular to a ship propulsion load prediction method, system and device under a high-fluctuation working condition and a medium, and the method comprises the steps: obtaining a ship operation parameter sequence under the high-fluctuation working condition; inputting the ship operation parameter sequence into a pre-trained propulsion load prediction model, and outputting a ship propulsion load prediction sequence of a specified time scale; the propulsion load prediction model comprises an improved time sequence convolutional network, a bidirectional long short-term memory network, an attention mechanism unit and a full connection layer. According to the application, bidirectional multi-scale features are extracted by improving a time sequence convolutional network, a bidirectional long-short-term memory network separates forward and backward time sequence processing paths to analyze a bidirectional dependency relationship, an attention mechanism unit adopts three-stage weight distribution to enhance key feature focusing, a full-connection layer implements nonlinear mapping, and a full-connection layer implements non-linear mapping. And collaborative optimization of the propulsion load prediction precision and the real-time response capability under the high-fluctuation working condition is realized.

The invention discloses an extended-range hydrogen fuel power ship propulsion system, which relates to the technical field of ship propulsion and comprises an acquisition module, a quantum annealing optimization module and a quantum chip, the acquisition module is used for eliminating noise interference of acquired hydrogen energy ship power parameters through a Kalman filtering algorithm and generating a standardized data packet, and the quantum chip is used for receiving the standardized data packet and outputting the standardized data packet. The method comprises the following steps: mapping hydrogen energy ship power parameters into an Isin model, generating a control instruction according to a hydrogen fuel consumption rate, an equipment life attenuation coefficient and a navigation task priority weight, inputting the control instruction into a simulation model of a proton exchange membrane by a proton membrane regulation and control module, and dynamically regulating a hydrogen production rate and fuel cell power, according to the system, the efficient hydrogen energy closed-loop monitoring unit and the three-level safety protocol are adopted, the response speed and precision are improved, the stability and safety are remarkably enhanced, it is ensured that a ship can reliably operate under the complex working condition, and potential safety risks are reduced.

The invention relates to the technical field of ship propulsion system monitoring, in particular to a shafting load analysis method based on real-time data monitoring, and the method comprises the following steps: S1, collecting a pressure parameter and a displacement parameter of a shafting; s2, performing timestamp alignment and data frame encapsulation to generate a synchronous data stream; s3, shafting natural vibration noise and real load signals are separated, and shafting real-time torque distribution is calculated; s4, if the torque distribution deviates from the correction threshold value, graded early warning is triggered; and S5, generating an interactive report according to the triggered early warning level and the torque distribution result. According to the invention, through multi-sensor synchronous acquisition, edge calculation data alignment, vibration noise decoupling, dynamic safety threshold adjustment and intelligent fault tracing analysis, high-precision monitoring, abnormity early warning and intelligent maintenance of the shafting load are realized, and the safety and operation and maintenance efficiency of ship operation are improved.

The invention provides a marine diesel engine shafting longitudinal-torsional coupling vibration calculation method. The method specifically comprises the following steps: S1, calculating crankshaft longitudinal-torsional coupling rigidity; s2, calculating torsional vibration excitation at the propeller by using a CFD method; s3, establishing a ship propulsion shafting coupling free vibration kinetic equation through the calculated longitudinal-torsional coupling stiffness; s4, calculating a longitudinal-torsional coupling inherent frequency and a vibration mode of the ship propulsion shafting through a coupling free vibration kinetic equation of the ship propulsion shafting; and S5, substituting the propeller excitation calculated in the step S2 into the ship propulsion shafting coupling forced vibration kinetic equation to calculate the longitudinal-torsional coupling forced vibration response of the ship propulsion shafting. According to the marine diesel engine shafting longitudinal-torsional coupling vibration calculation method, the crankshaft longitudinal-torsional coupling rigidity is calculated based on a material mechanical deformation energy method, and related exciting force considering the crankshaft longitudinal-torsional coupling effect is obtained by combining related formulas of marine diesel engine shafting dynamics; and finally, ship shafting longitudinal-torsional coupling vibration inherent characteristics and ship shafting longitudinal-torsional coupling forced vibration response are obtained through calculation.

The invention discloses a ship propulsion control system and method, and relates to the technical field of ship engineering.The ship propulsion control system comprises an acquisition module used for acquiring analog quantity signals during ship propulsion, and a main controller module used for receiving the analog quantity signals and generating a propulsion control instruction; according to the ship propulsion control system, two acquisition channels are arranged for analog quantity signals, a fault channel is rapidly detected and switched in combination with a self-checking mechanism, the fault channel can be rapidly detected, the fault channel can be rapidly switched, the fault channel can be rapidly detected, the fault channel can be rapidly switched, and the reliability of the ship propulsion control system can be improved. A digital quantity output channel fault is found in time and switched to a standby channel, a power supply and communication interface backup strategy is perfected, fault priorities are accurately divided, corresponding measures are taken, the strict requirements of modern ships for high reliability and high safety of propulsion control are met, and powerful technical support is provided for stable navigation of the ships.

The invention relates to the technical field of ship propulsion power generation system control, in particular to a constant-power rotating speed control method and system for a ship shaft generator, and the method comprises the following steps: obtaining operation state parameters and ship environment parameters of a ship propulsion power generation system; based on the operation state parameters and the ship environment parameters, the influence of the adjusting action of the shaft generator on the rotating speed of a main propulsion diesel engine and the influence of the adjusting action of a main propulsion diesel engine speed adjusting device on the output power of the shaft generator are pre-judged, and an interactive pre-judgment result is obtained; according to the interactive pre-judgment result, jointly deciding and generating a first adjusting instruction for adjusting an axle generator and a second adjusting instruction for adjusting a main propulsion diesel engine speed adjusting device; by introducing an interactive pre-judgment and joint decision-making mechanism, the negative interaction between the shaft generator and the main propulsion diesel engine speed regulation device can be effectively identified and eliminated, and the operation stability and safety of the ship under the severe sea condition are improved.

The invention discloses a ship shafting reliability evaluation method and system based on multiple working conditions, and the method comprises the steps: collecting multi-source data of a ship propulsion system through integrating multiple sensors; constructing a dynamic load spectrum based on a time-varying Copula function in combination with parameters such as a stress distribution function and a degradation amount distribution function; a reduced basis finite element method is adopted, experimental strain data are collected, and a reduced-order basis matrix is constructed; based on a three-stage Wiener degradation model, in combination with parameters such as a material degradation rate, activation energy and a temperature average value, the residual life of the ship propulsion system is predicted, and model parameters are adjusted in real time through a Bayesian dynamic updating mechanism; building Hamiltonian through physical constraint reinforcement learning, and optimizing operation parameters of the ship propulsion system in combination with a fault probability threshold value and an energy change rate threshold value; a digital twin engine is utilized to provide real-time visual output. According to the invention, the service life is prolonged to the greatest extent while the system meets the performance requirements; and monitoring and decision making by operators are facilitated.

The invention provides a ship propulsion motor fault diagnosis method and device and a readable storage medium, the ship propulsion motor adopts a permanent magnet synchronous motor, and the method comprises the steps of collecting normal operation data of the permanent magnet synchronous motor under different working conditions and abnormal data of turn-to-turn short circuit and excitation loss faults; overlapping and sampling the collected three-phase current signals to form a fixed-length sample, and converting the three-phase current signals of the sample into phase comparison current points in a gray image state to form a sample data set; a ship propulsion motor fault diagnosis neural network model is built, the model comprises an input layer, a feature extraction layer, a full connection layer and an output layer, an improved residual network module is arranged in the feature extraction layer, a channel attention mechanism and a pre-activation residual module are fused, and the feature learning ability of key fault features of the ship propulsion motor is enhanced; and based on the trained ship propulsion motor fault diagnosis neural network model, performing early turn-to-turn short circuit and excitation loss fault diagnosis of the permanent magnet synchronous motor.

The invention provides a ship propulsion shafting and a design method thereof, and the design method comprises the steps: determining positioning points at two ends of a shafting bow and a shafting stern according to the overall arrangement of a ship; determining the shaft diameter and length of each shaft section of the shafting according to the propulsive power requirement and the positioning points at the bow and stern ends of the shafting; determining the positions and the number of the bearings; when all shafts are calculated to be metal shafts, shafting strength and shafting pilot test calculation are carried out, and when the intermediate shaft is replaced by a carbon fiber shaft from a metal shaft and other shaft sections are not changed, shafting strength and shafting pilot test calculation is carried out; and when the strength and the shafting alignment of the shafting after the carbon fiber shaft is replaced meet the set requirements, the current shafting design scheme is reasonable. According to the design method, a replaceable intermediate shaft can be arranged on the propulsion shafting, and specific parameters of each shafting are reasonably determined, so that the design requirements of ships under certain special conditions are met, and the design method is suitable for shafting design of kiloton-level surface ships propelled by adopting conventional power shafting belt propellers.

The invention discloses a hydrogen fuel cell ship electric propulsion inertia self-adaptive optimization control method, which relates to the technical field of hydrogen fuel cell ship electric propulsion control, and comprises the following steps of: acquiring ship operation state data and ship internal power network fluctuation data in real time, preprocessing, extracting features, calculating a virtual inertia coefficient and a virtual damping coefficient, and calculating an inertia coefficient and a damping coefficient; generating a virtual torque instruction; obtaining a total power demand of the ship by using a torque rotating speed calculation method, and dividing the total power demand into high-frequency, intermediate-frequency and low-frequency ship power distribution instructions; through a virtual synchronous machine model, the actual power of the ship is output, the voltage of a direct-current bus and the power of a hydrogen fuel cell are monitored in real time, a dynamic compensation power fluctuation method is utilized, the operation state of the ship is regulated and controlled, and a voltage stability index is obtained; the ship propulsion inertia is adaptively optimized through a power regulation algorithm, so that the ship can better adapt to different working conditions, and the stability and safety of the ship are enhanced.

The invention relates to the technical field of ship power system control, in particular to a ship shaft power generation energy management and efficiency optimization method based on multi-working-condition adaptation, and the method comprises the steps: a data collection and processing step: collecting and preprocessing multi-source heterogeneous operation parameters capable of comprehensively representing a ship propulsion system, a power system, a motion state and an external environment in real time; a working condition dynamic identification step; an optimization model dynamic construction step; an online optimization and control step; and an adaptive learning step: based on new data generated in a system operation process, performing periodic incremental training on the time sequence deep learning model to update network parameters of the time sequence deep learning model. The self-adaptive learning enables the system to continuously optimize the working condition identification precision along with the time lapse of ship operation and the change of the external environment, and improves the long-term stability and adaptability of the system.

The invention discloses a ship propulsion shafting fault diagnosis method based on multi-modal attention fusion, and relates to the technical field of ship fault diagnosis. According to the method, multi-modal data such as vibration parameters, lubricating oil parameters and cooling water parameters of key parts of a ship propulsion shafting are synchronously collected and preprocessed; a modal specific feature extraction strategy is adopted, a multi-modal attention fusion mechanism including intra-modal self-attention, inter-modal cross attention and adaptive dynamic weight distribution is designed, and heterogeneous modal features are effectively integrated. Compared with a single-mode method and a traditional feature splicing method, the method has the advantage that the diagnosis accuracy is remarkably improved. The method has high robustness, and can still maintain high diagnosis accuracy even under the condition that part of sensors fail.

The invention provides an energy management strategy verification platform for a plug-in series hybrid power ship propulsion system. The energy management strategy verification platform comprises a power source module, a power output module, a load simulation module, a transmission module, a sensor measurement module and a control system module, the power source module outputs electric energy through multi-energy cooperation; the power output module generates propelling power according to the electric energy; the load simulation module simulates load characteristics according to the propulsion power; the transmission module is connected with the power source module and the power output module as well as the power output module and the load simulation module; the sensor measurement module collects operation parameters of the verification platform; and the control system module executes an energy management strategy according to the operation parameters and outputs a control instruction. A graphical programming environment is constructed by adopting a modeling code automatic generation system, and a strategy rapid prototype development verification closed loop is formed in combination with a range extender intelligent start-stop control strategy and a multi-mode power generation control strategy.

The invention provides a time domain and frequency domain combined impact resistance analysis method and device for a ship stern tube, and the method comprises the steps: building geometric models of all parts in the stern tube through three-dimensional modeling software according to an actual engineering drawing of the stern tube, carrying out virtual assembly on the geometric model of each component according to the actual assembly relation of each component to obtain a geometric model of the tail shaft tube; importing the geometric model of the tail shaft tube into finite element software, endowing each component with material attributes, and carrying out grid division on the geometric model by adopting an overall network size control method; and performing static analysis on the geometric model after grid division to obtain static working stress, performing dynamic analysis on the geometric model after grid division to obtain dynamic impact stress, and synthesizing the static working stress and the dynamic impact stress into total stress. According to the method, time domain and frequency domain combined shock resistance response calculation is carried out for the tail shaft tube as a core component of the ship propulsion system, and the accuracy of shock resistance response calculation is improved.

A method for controlling a marine drive configured to propel a marine vessel. The method includes receiving a destination for the marine vessel, receiving a demand request for operating the marine drive, and operating the marine drive at an actual demand corresponding to the demand request. The method further includes determining a required energy for the marine drive to propel the marine vessel to the destination at the actual demand and determining a remaining energy of an energy source available for operating the marine drive. The method further includes comparing the required energy to the remaining energy and, when the remaining energy is less than the required energy, automatically iteratively reducing the actual demand for operating the marine drive until the remaining energy equals or exceeds the required energy determined for the marine vessel to reach the destination.

The invention discloses a six-phase motor driver harmonic current suppression method based on multi-subspace control, and belongs to the technical field of motor control. In order to solve the problem that low-order harmonic current of a six-phase motor in a z1-z2 subspace is difficult to effectively suppress, the invention provides a scheme that a mathematical model of the six-phase permanent magnet synchronous motor is established, multi-subspace decomposition is carried out, and stator current is divided into a d-q subspace and the z1-z2 subspace; a double-closed-loop control architecture with a speed loop as an outer loop and a current loop as an inner loop is constructed, a d-q subspace adopts a PID regulator to realize fundamental current control, and z1-z2 subspaces realize suppression of fifth and seventh harmonic currents through a parallel structure of PI and a quasi-proportional resonance controller; and a PWM signal is synthesized through inverse transformation and dual three-phase space vector pulse width modulation, and an inverter is driven to realize stable output of fundamental wave energy and harmonic suppression. The method effectively reduces the harmonic distortion rate, improves the operation efficiency and stability, and is suitable for occasions of new energy vehicles, ship propulsion, rail transit and the like.

A marine propulsion system with a closed coolant loop is described. The marine propulsion system has a starboard heat exchanger and a port side heat exchanger that provides improved cooling and increases engine life compared with traditional open loop cooling systems, particularly in harsh environments such as salt water, brackish water, swamp, shallow or sediment and debris rich water. The two discrete heat exchangers are mounted to the lower unit of the marine propulsion system and also serve to improve hydrodynamic performance of the marine propulsion system.

The invention relates to the technical field of ship propulsion system design, and particularly discloses a ship engine-propeller intelligent matching method and system based on a multi-source fusion algorithm, and the method comprises the steps: carrying out the optimization of a preset braking horsepower calculation rule based on ship related parameters, generating an optimized horsepower calculation rule, and carrying out the optimization of the optimized horsepower calculation rule; the method comprises the steps of optimizing a horsepower calculation rule, performing nonlinear coupling on the optimized horsepower calculation rule on the basis of an effective horsepower demand calculation rule to generate a coupled horsepower calculation rule, and finally performing host-propeller matching operation on the basis of a propeller map, ship design parameters, the coupled horsepower calculation rule and a matching horsepower coefficient to obtain a corresponding propeller model. The main engine-propeller matching operation is executed based on the propeller map, the ship design parameters, the coupled horsepower calculation rule and the matching horsepower coefficient, the corresponding propeller model is obtained, multi-model data fusion matching of the propeller model is achieved, and the propeller matching efficiency is improved.

The invention relates to the technical field of ship propulsion control, in particular to a ship propulsion motor rotating speed control method based on a long short-term memory network, which comprises the following steps of: collecting historical data in a ship operation process within a period of time, preprocessing the historical data and persisting the historical data into a database; reading historical data in the database, and training a long short-term memory (LSTM) network model; a sensor is used for collecting operation parameters of the propulsion motor in real time, and the operation parameters are converted into an input parameter format of the LSTM model. According to the ship propulsion motor rotating speed control method based on the long short-term memory network, key parameters such as the current value and the frequency of a propulsion motor, the rotating speed of a steam turbine and the rotating speed of the propulsion motor are collected in real time, an LSTM model is used for modeling system dynamic characteristics, and an optimal control instruction is generated in combination with an optimization algorithm; and the precision, stability and adaptability of ship propulsion motor rotating speed control are improved.

The invention provides a self-cooling electromagnetic direct-driven straight wing propeller, and relates to the technical field of ship propellers, the propeller comprises a shell, and an outer disc type motor, an inner disc type motor and a propelling mechanism which are arranged in the shell; the outer disc type motor comprises an outer rotor and an outer stator, the outer rotor is rotatably connected with the shell, and the outer stator is fixed to the shell. The inner disc type motor is coaxially arranged on the inner side of the outer disc type motor and comprises an inner rotor and an inner stator, the inner stator is fixed to the shell, and the inner rotor is rotatably connected with the outer rotor. The propelling mechanism comprises a disc, straight wing blades, a sun gear and a planetary gear, the disc is fixed to the outer rotor, the blades are evenly distributed in the circumferential direction, and a rotating shaft is rotatably installed on the disc. The sun gear is coaxially fixed with the inner rotor, the planetary gears are uniformly distributed, meshed with the sun gear and rotatably connected with the outer rotor, and each planetary gear is fixed with the corresponding blade rotating shaft. According to the propeller, the blades are driven to revolve and swing through the two motors respectively, a traditional complex structure is simplified, the size and weight are reduced, and the energy conversion efficiency is improved.

A method of controlling propulsion of a marine vessel includes receiving an instruction to engage a wake control mode and then automatically effectuating a steering change and / or a propulsion output change. A vessel orientation response to the steering change and / or the propulsion output change is measured and a determination of whether a wake zone requirement is met is made based on the orientation response. If the orientation requirement is met, a current propulsion output that meets the wake zone requirement is maintained. If the orientation requirement is not met, a further steering change and / or further propulsion output change is automatically effectuated until the wake zone requirement is met.

A cooling device for a ship propulsion machine includes a drain passage and a collector. The collector includes a collector main body, a case, an upper connection pipe, and a lower connection pipe having flexibility. A first bent portion is provided between an upper end portion and a lower end portion of the lower connection pipe. A second bent portion is provided between the first bent portion and the lower end portion of the lower connection pipe. The lower connection pipe extends downward from the upper end portion thereof along an axis of the case, bends at the first bent portion, extends downward while being inclined with respect to the axis so as to be separated from the axis, bends at the second bent portion, and extends downward while being inclined with respect to the axis so as to be close to the axis.

To improve space efficiency.SOLUTION: A marine propulsion device includes: a first drive shaft 7; a drive gear 4 which rotates integrally with the first drive shaft 7; a second drive shaft 14 which is parallel to the first drive shaft 7; a driven gear 13 which rotates around a center axis of the second drive shaft 14; and a water pump assembly 10 for supplying a coolant to an engine 131. The driven gear 13 is driven by the drive gear 4 to drive the second drive shaft 14 rotationally. The water pump assembly 10 is disposed in the first drive shaft 7 and driven by the first drive shaft 7.SELECTED DRAWING: Figure 3

A foreign matter collecting device provided at a ship propulsion device that is configured to apply a propulsive force to a ship, the foreign matter collecting device includes an anti-ventilation plate extending in a horizontal direction and a collecting part provided in the anti-ventilation plate. A flow path extending from a water intake port to a water discharge port is provided in the anti-ventilation plate. A filter configured to collect fine-grained foreign matters from a water flow in the flow path is provided in the collecting part.

The present disclosure relates to a vessel propelling mechanism. In one aspect, a vessel propelling system includes a motor and a waterjet system. The waterjet system is coupled to the motor and includes a stator with a plurality of blades. A first blade of the plurality of blades has a shape that is different than remaining blades of the plurality of blades, the shape of the first blade allowing a driving mechanism of the motor to be coupled to a shaft within the waterjet system.

The invention relates to the field of ship energy efficiency control, and provides a method for quickly optimizing parameters of an energy-saving device in front of a propeller. Based on an orthogonal test design method, a PCA correlation analysis algorithm and computational fluid mechanics numerical simulation, through reasonable analysis, screening and optimization combination of numerous structure parameters, on the premise that the number of tests is reduced as much as possible, a parameter combination enabling the performance of the paddle-front energy-saving device to be optimal can be accurately found, and the performance of the paddle-front energy-saving device is optimized. Therefore, the purpose of optimizing the energy-saving device in front of the propeller is smoothly achieved, and an efficient, economical and scientific solution is provided for energy-saving work of a ship propulsion system.

The outboard motor 3 includes an electronic control unit 33 that acquires a trim angle from a trim angle sensor and controls the actuator for trim adjustment. The electronic control unit acquires the trim angle at predetermined time intervals, stores each stably obtained trim angle in the memory as a stop trim angle, and compares each current value of the detected trim angle with the stop trim angle. It is determined if the trim angle sensor is abnormal or not based on the current value of the detected trim angle and the stop trim angle, and when it is determined that the trim angle sensor is abnormal, the operation of the actuator is restricted.

The invention discloses a propulsion device for a ship, and belongs to the field of ship propulsion. Comprising a shell, and a driving mechanism is arranged in the shell; a water cooling mechanism is embedded in the lower surface of the shell; a propelling mechanism is arranged on the right side of the shell; a guide mechanism is arranged at the position, located above the driving mechanism, in the shell; the driving mechanism comprises a shaft rod, the upper surface of the shaft rod is fixedly connected with a connecting rod, and two movable grooves are formed in the upper surface of the connecting rod; in the extending or shortening process of the electric push rod, one of the two motors is located on the left and the other is located on the right, and the propelling mechanism is controlled to be started and the ship is controlled to be propelled by controlling the motor on the right to be started; by means of the mode, the electric push rod only needs to contract and is matched with two motors for alternate use, and the problem that in the prior art, the motors are prone to being damaged in the long-term operation state due to single-motor driving propelling can be solved.

To provide a propulsion system, a control program, and a control method for a vessel capable of suppressing deterioration in fuel consumption along with load variation in a propulsion propeller in a vessel including an engine and a rotary machine.SOLUTION: A propulsion system for a vessel includes an engine, a rotary machine, a power converter, and a controller, the controller acquires torque of the engine, torque of the rotary machine, angular speed of the rotary machine, and prefixed moment of inertia for rotational axis conversion of the rotary machine, calculates an estimation value for load torque of the propulsion propeller by using equation of motion for the rotary axis system of the rotary machine, generates a torque command value regarding the torque to be generated by the rotary machine from the propulsion force command value, and compensates the torque command value to cancel fluctuation component of the estimation value of the load torque.SELECTED DRAWING: Figure 2