Abstract: An intelligent course planning method and controller for unmanned surface vehicle are provided, an overall optimization from starting point to end point of course deflection angle is achieved based on an optimization principle of approximate dynamic programming; an optimization of minimization of the course deflection angle and a control signal is achieved based on a quadratic form cost function and a performance index by designing a virtual radial basis function neural network and a least square method, a target course expression is obtained, and a stability and a degree of convergence are ensured through a positive-definite constraint of the Hessian matrix of the performance index. Compared with the related art, an overshoot of course deflection and the control signal is reduced, an optimization of flight and steering energy consumption is achieved, and completely data-driven for intelligent course planning for unmanned surface vehicle and a high-accuracy feedback adjustment are achieved.

Abstract: An autonomous ship bottom inspection method by a ROV(s) based on a ship 3D model in STL format is provided. The ship 3D model is obtained and a surface thereof is spliced by triangular facets. Body 3D coordinate points of the ship 3D model are obtained and then expanded according to a safety distance of ROV and ship to obtain inspection track points of the ROV. The ship 3D model is divided into regions, and the inspection track points in each region are performed with interpolation and smoothing. Smoothed inspection track points of the regions are connected as per a result of the dividing to obtain a ship bottom inspection track, a real-time position of the ROV is obtained, a ship bottom inspection path is generated based on the ship bottom inspection track and the real-time position. The ROV is controlled to move as per the ship bottom inspection path.

Abstract: The present invention relates to a power supply system, especially for a floating vessel, comprising at least two segregated power sections, each constituting a main redundancy group, and each comprising at least one of a power generator adapted to generate an electrical power to a main switchboard and a power consumer, such as a propulsion unit, drawing power from said switch board, and a bus-tie connecting the main switch boards of each redundancy group. The system also comprises at least to segregated directly powered thruster redundancy groups, each including a thruster drive, each being connected to the main switch board of a corresponding one of the main redundancy groups, respectively, the thruster redundancy groups including AC/DC converter means and a DC interconnection connecting the thruster redundancy groups thus proving a loop structure, the thruster redundancy groups being able to draw power from both main switchboards.

Abstract: Energy storage system suitable for retrofitting into a power supply system as well as method and power allocation system related to this. The power supply system comprises at least two segregated power system sections, each constituting a redundancy group, each comprising an AC switch board and at least one of a power generator adapted to generate an electrical power to the switch board and/or power consumer drawing power from said switchboard. The energy storage system is configured to be coupled to the AC switch board in each of the at least two redundancy groups, the unit constituting a common and autonomous energy storage system, the energy storage system including an energy management system adapted to distribute additional power between the energy storage system and redundancy groups, and/or between the redundancy groups through the energy storage system, thus providing an additional segregated power source.

Abstract: A method for recovering high-purity magnesium sulfate includes: a pre-precipitation step of mixing an alkali precipitant and seawater; a concentration step of reacting a precipitate formed in the pre-precipitation step with sulfuric acid, followed by filtering to obtain a first eluate; a first precipitation step of adding ethanol to the first eluate, and then removing a first precipitated solid to obtain a second eluate; and a second precipitation step of precipitating magnesium sulfate solid by further adding ethanol to the second eluate from which the first precipitated solid has been removed.

Abstract: An electric machine comprising a stator with a plurality of open slots accommodating double-layer distributed winding with conductors transposed in the end-winding area. The conductors are litz wire conductors and the end-winding portions of the conductor are not twisted or turned around the axis of the conductor.

Abstract: A vessel environment condition assessment system and method, the system comprising a motion measurement unit on board a vessel configured to sense the vessels motion, wherein the motion measurement unit is configured to output a motion signal of the vessel, a processor adapted to receive the motion signal of the vessel, and apply an energy operator to the motion signal to calculate an energy signal representative of the environmental condition for the vessel.

Abstract: Drive shaft monitoring system has a first and second coded disc. The first and second coded disc are provided with multiple slots or recesses evenly distributed in circumferential direction thereof. The drive shaft monitoring system includes at least two independent light sensor assemblies arranged in connection with the slots or recesses of the first and second coded disc.

Abstract: Disclosed are a tunnel-inspection image acquisition device, a tunnel-inspection system and a tunnel-inspection method. With a plurality of CCD cameras, a plurality of auxiliary light sources and a fixing bracket, wherein the CCD cameras and the auxiliary light sources are fixed on the fixing bracket, and the plurality of CCD cameras are fixed on the same ring, a center of the ring is located at a center of a circle of the tunnel in working condition, distances between the plurality of CCD cameras and a tunnel lining are the same and overall shooting angles of the plurality of CCD cameras cover a range of the tunnel lining; meanwhile, with the cooperation of a computer, a monitor, a synchronous encoder and a data collector on a defect detecting mobile platform, functions such as the synchronous shooting, the disease identification, the real-time splicing and display of the tunnel can be achieved.

Abstract: The invention provides an underground container logistics loading and unloading system based on a deep underground passage. The underground container logistics loading and unloading system comprises an automatic container wharf, a logistics park and the deep underground passage. The automatic container wharf is connected with the logistics park through the deep underground passage, and the deep underground passage internally comprises an area where shuttle vehicles run; and the deep underground passage comprises a main body layout area and accessory equipment.

Abstract: The invention relates to a method for controlling a water jet propulsion device for the propulsion of a marine vessel, the water jet propulsion device comprising: a conduit extending between an inlet and an outlet; an impeller in the conduit; and a mechanical power provider arranged to deliver power to the impeller; the method comprising receiving a plurality of thrust commands, and controlling a thrust level of the water jet propulsion device in dependence the thrust commands, wherein controlling the thrust level comprises adjusting a position of a deflector arranged to deflect water flowing out of the outlet, characterised by coordinating the adjustment of the position of the deflector with a level of engagement of a clutch, arranged to adjust the delivery of power from the power provider to the impeller, so that the thrust level is substantially continuous in a thrust command domain.

Abstract: Disclosed are a quantum color image encrypting method based on modification direction and corresponding circuit, respectively providing quantum modular circuits design for a parallel adder, a parallel subtractor, a comparator, a cyclic shift add 1, and a cyclic shift subtract 1; and based on these modular circuits, circuit for implementing quantum color image steganography is provided. From the complexity analysis of implementing quantum circuit for color image steganography, it is seen that for a two-dimensional quantum color image with 22n pixels and the R, G, and B channels of which are respectively represented by q number of quantum bits, the steganography algorithm is an efficient transformation method, and the circuit complexity is O(q2+n), which can hardly be achieved by classical geometric transformation. The disclosure is applicable for many practical image processing applications, e.g.

Abstract: A method for measuring heat dissipation of electromechanical device includes: S1. establishing a measuring apparatus; S2. measuring and obtaining data: a mass flow m corresponding to each cooling medium flowing through a housing, a temperature T1 of a liquid inlet, a temperature T2 of a liquid outlet, a temperature T3 of an air inlet, a temperature T4 of an air outlet, a temperature T5 of the inside wall of the housing, a temperature T6 of the outside wall of the housing, a total area A of the inside wall of the housing, and a wall thickness L of the housing are measured by the measuring elements; S3. calculating the heat dissipation. The heat dissipation of the electromechanical device under a working condition is measured so as to provide a reference for the heat dissipation design of electromechanical device.

Abstract: Disclosed is a ship image track tracking and prediction method based on ship heading recognition, which includes the following steps: obtaining a ship image data set, preprocessing the data set to obtain a preprocessed data set; inputting the preprocessed data set into the rotating ship detection network for training, obtaining the trained rotating ship detection network, collecting the ship navigation video, and inputting the ship navigation video into the trained rotating ship detection network to obtain the ship detection result; inputting the ship detection result into the rotating ship tracking network and tracking the target ship to obtain the historical trajectory and the heading information of the target ship; inputting the historical trajectory and ship heading information of the target ship into the ship trajectory and ship heading prediction network, and predicting the navigation trajectory and ship heading at sea.

Abstract: 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.

Abstract: [Object] It is an object of the present invention to provide a shipbuilding simulation method and a shipbuilding simulation program based on a unified database capable of simulating building of a ship at detailed operation level.

Abstract: The invention discloses an atmospheric water harvesting device based on a semiconductor chilling plate and a preparation method thereof. A first anti-gravity wicking material and a second anti-gravity wicking material are used as water transmission channel to realize a continuous atmospheric water harvesting on the same plane, the first anti-gravity wicking material and the second anti-gravity wicking material are combined with the semiconductor chilling plate, and the cold side can continuously maintain the temperature of the hygroscopic area, so that the hygroscopic salt on the surface of the anti-gravity wicking material maintains a stable moisture absorbing rate. The heat at the hot side can accurately heat the desorbing area on the surface of the material, the cooling capacity and the heat of the semiconductor chilling plate can be fully utilized, and the atmospheric water absorbing with low energy consumption is realized.

Abstract: Disclosed are a ship arrival prediction system and a ship arrival prediction method. The system includes a data acquisition module for acquiring historical sample data of a ship arrival; a data processing module connected with the data acquisition module and used for processing the historical sample data and converting the processed data into a two-dimensional matrix; a spatial temporal graph convolution layer module connected with the data processing module and used for modeling the converted data and obtaining optimal model parameters through training operations; and a full connection module connected with the spatial temporal graph convolution layer module and used for carrying out a dimensional reconstruction on an output result of the spatial temporal graph convolution layer module and outputting to obtain a predictive value of the ship arrival in each port.

Abstract: The present invention is to simulate building of a ship at a detailed operation level by executing: a product model creating step S1 of creating a product model by obtaining basic design information 1 in which a coupling relation between a completed part and a component part of the ship is clarified; a facility model creating step S2 of obtaining equipment information 21 and worker information 22 of a factory and creating a facility model; a process model creating step S3 of clarifying assembling procedure and tasks to build the completed part and creating a process model based on the product model and the facility model; a simulation step S4 to carry out time evolution system simulation based on the process model; and a time series informatization step S5 of time series digitizing a result of the time evolution system simulation into building time series information 42.