365results about How to "Improve propulsion efficiency" patented technology

The invention provides an underactuated autonomous underwater vehicle (AUV) adaptive trajectory tracking control device and a control method. The practical positions and the course angles of an AUV which are acquired to a measurement element (3) and reference positions and reference course angle information which are generated by a reference path generator (1) are converted through a diffeomorphism converter (6) to obtain new state variables, then the new state variables and speed and angular speed information which is acquired by a sensor (5) are transmitted to a parameter estimator (11) anda longitudinal thrust and course changing moment controller (14), and a control command is obtained through resolving to drive an actuating mechanism to adjust the longitudinal thrust and the course changing moment of the AUV. By using the underactuated AUV adaptive trajectory tracking control device, the inertial mass parameters of the AUV and hydrodynamic damping parameters are not required to be known and the goal of arriving at designated positions at designated time according to designated speed is realized. Since the AUV considered in the invention is underactuated, the energy consumption and the manufacturing cost of a system can be reduced, the weight of the system can be reduced and the propulsion efficiency can be improved.

The invention discloses a shaftless driven type integrated motor propeller which is arranged on the tail part of a boat body of a water vehicle or underwater vehicle and comprises a front stator, a rotor propeller and a rear stator which are serially arranged on a solid non-rotating shaft, wherein the periphery of the propeller is connected with the circumferential rim of the annular propeller, a rotor permanent magnet is embedded in the circumferential rim of the propeller, a stator winding is arranged in the inner cavity of a guide pipe, the rotor permanent magnet and the stator winding are sealed by adopting water, and a gap is arranged between the rotor permanent magnet and the stator winding to form an annular motor. The rotor permanent magnet and the stator winding as well as the guide pipe are organically combined to form a modular unit, thus the shaftless driven type integrated motor propeller can be easily installed on a water platform or underwater platform, is suitable for large-power main propelling of a water boat or underwater submergible device, and has the advantages of reasonable structure, high propelling efficiency, low hydrodynamic force radiation noise, excellent cavitation property, safety and reliability.

The invention relates to a vertical take-off and landing rotor aircraft with ducts built in wings, relates to the technical field of the vertical take-off and landing rotor aircraft, and particularly relates to the technical field of the vertical take-off and landing rotor aircraft with the ducts built in the wings. The wings are provided with lifting ducts; an inner bin is arranged on the inner wall of each lifting duct close to upper and lower wallboards of the wings so as to built in an duct cover; the duct cover can realize opening and closing of the lifting ducts; a diversion trench is arranged on the tail part of a fuselage; two sides of the diversion trench are provided with two supporting members and connect a tilting thrust duct arranged at the tail part of the fuselage to the fuselage through a tilting control mechanism; the tilting thrust duct is composed of coaxial tilting duct walls and coaxial thrust dual rotors; and engines are arranged in the fuselage and transmit power to the lifting duct and the tilting thrust duct through a reducer respectively. The aircraft increases an adjustable scope of the whole aircraft along an axis direction of the fuselage while not greatly weighting the whole aircraft, prevents bareness of the rotors, and increases propulsive efficiency of the aircraft.

The invention discloses an optimization design method of fibre enhanced composite material marine propeller blades, which relates to an optimization design method of propeller blades and aims at solving the problem of imperfect design method of the fibre enhanced composite material marine propeller blades. On the basis of offsets data of the original high-speed metal propeller blades, the method is calculated by using a fluid-solid coupling method combining with the implementation of predeformation strategy, a blade structure is composed by mixed fibre composite materials, the surface of a blade adopts fibre glass enhanced composite material, the interior of the blade adopts the mixture of carbon fiber and Kelvar fiber enhanced composite material, and the specific mixed paving mode and the mixing ratio are determined according to the hydro elastic design result of a fibre enhanced composite material marine propeller. The optimization design method is used for designing the propeller blades.

The present invention provides one kind of turtle-shaped bionic underwater robot, which includes one turtle-shaped casing, one sensing and measuring unit in the head and shoulder part, one control and drive unit in the chest, one power source unit in the abdomen, one communication system unit in the tail, one front limb moving unit and one back limb moving unit. The sensing and measuring unit consists of one sonar detector, one underwater CCD camera, and multiple light sources; the control and drive unit consists of one executing controller and one coordinating controller; the power source unit includes one motor driving power module and controller power module; and the communication system unit consists of one communication system module and one external antenna. The present invention has the advantages of high flexibility, low power consumption, one noise, great traveling range, etc.

The invention discloses an underwater vehicle with the water jet propulsion technology adopted. The underwater vehicle comprises an underwater propulsion device (10) and a control system. The underwater propulsion device (10) comprises a tail portion (13), a water inlet disk (11) and a head portion (12) which are sequentially arranged from left to right. A jet which is used for providing propulsion power is respectively formed in the tail portion (13) and the head portion (12). The water inlet disk (11) is provided with a water inlet used for sucking water and a high-pressure pump used for converting sucked-in water into high-pressure water flow, and the high-pressure pump is respectively connected with the jets through pipelines. Propulsion power on the jets is provided by the high-pressure water flow obtained from the conversion by the high-pressure pump. The caliber of the water inlet (110) of the water inlet disk is larger than the caliber of the jets. Electromagnetic valves are arranged on the pipelines between the jets and a water outlet (115) of the high-pressure pump. Both the high-pressure pump and a water control device are connected with the control system mutually.

A design method for marine propeller made of carbon fiber composite material relates to a design method for a propeller. The invention solves the problem that the current design method for the marine propeller made of carbon fiber composite material is imperfect. The geometrical appearance of the blade by the design method for marine propeller made of carbon fiber composite material is calculated by fully using the flexibility and designable performance of the composite material on the basis of the value data of the original MAU metal propeller blade and combining the fluid-structure coupling method with the implementation of the pre-deformation tactics; and the outside of the propeller hub is wrapped by the carbon fiber composite material. The marine propeller made of carbon fiber composite material designed by the method has the geometrical appearance and the internal structure more suitable for the propeller made of carbon fiber composite material, thereby being capable of effectively improving the fluid elasticity of the propeller and improving the propulsive efficiency.

Supersonic Magnetic Advanced Generation Jet Electric Turbine (S-MAGJET) described herein, and a subsonic derivative, MAGJET, integrate a gas power turbine, superconducting electric power and propulsion generation, and magnetic power flux field systems along with an ion plasma annular injection combustor which utilizes alternative petroleum-based fuel and combustion cycles to create a hybrid turbine turbomachine for aerospace propulsion. The propulsion unit is able to achieve a dramatic increase in horsepower, combustion and propulsion efficiency, and weight reduction. In addition, the turbomachinery structures may be disposed within an exo-skeleton architecture that achieves an increase in thrust to weight ratio with a concomitant increase in fuel efficiency and power generation over traditional gas turbine technology today. The engine continuously adjusts the temperature, pressure and mass airflow requirements using an electromagnetic power management system architecture. Engine performance may be controlled across the entire desired flight envelope, whether subsonic, transonic or supersonic flight conditions. With bypass fan(s), compressor stages and turbine segments controlled electrically in a shaftless turbine design, the S-MAGJET maximizes the propulsion efficiencies over a broader range of operating conditions compared to current art of turbine technology and at much higher thermodynamic and aerodynamic efficiencies.

The flexible propelling mechanism of artificial machine fish includes flexible tail, motor driving mechanism inside the fish body and electric control part and can simulates fish's muscle twitch to drive the fish tail to swing harmoniously. The fish tail of stainless steel sheets is connected to the fish support, the tail fin driving steel wire and the tail body driving steel wire are fixed to the fish tail via the limiting guide holes separately, and two driving motors drive the tail fin driving wheel and the tail driving wheel separately. The harmonious tension and release of the steel wires realizes the composite motion of tail fin rotation and tail translation. The present invention can well simulate the motion posture of fish and raise propelling efficiency with eddy flow, and may be used in the hydraulic experiment research and as underwater equipment or miniature underwater detector.

A variable rigidity bionic swinging propulsion unit comprises a support, more than two joints of swinging devices and a tail fin, wherein each swinging device comprises an upper platform, a lower platform, eighteen flexible hinge points, eight outriggers and a spinal column, a flexible hinge point o' is arranged at the center of the upper platform, a flexible hinge point o is arranged at the center of the lower platform, and the flexible hinge points o' and o are connected together through a spine; and the flexible hinge points are respectively connected with each other through the eight outriggers. The variable rigidity bionic swinging propulsion unit has the advantages that the variable rigidity bionic swinging propulsion unit has the characteristics of large thrust, continuous movement and good flexibility; and the propulsion efficiency is improved, and a variable rigidity energy-saving swimming mechanism for fishes is realized.

The invention discloses an amphibious unmanned aerial vehicle which comprises a vehicle body and wings. Polygonal drivers are arranged in wing ribs of the wings. Each polygonal driver comprises a polygonal connecting rod mechanism and at least one pneumatic muscle driver. Connecting rods of the polygonal connecting rod mechanisms are connected with the wing ribs. The pneumatic muscle drivers are arranged in polygonal spaces formed by the polygonal connecting rod mechanisms, and the two ends of each pneumatic muscle driver are connected with the connecting rods of the corresponding polygonal connecting rod mechanism. The connecting rod mechanisms are used for connecting and fixing the pneumatic muscle drivers, the pneumatic muscle drivers are inflated and shrink in different directions, so that the connecting rod mechanisms output force in different directions, conversion of a concave wing profile and a convex wing profile is achieved, and the vehicle can meet the requirements for different flight speeds. The wings can intelligently and actively deform to meet the requirements for different navigation speeds, the amphibious unmanned aerial vehicle has the beneficial effects of being amphibious, quick to respond, long in time of endurance, capable of achieving formation flight and the like, and the vehicle can finish the tasks of naval vessel formation convoying, diver resistance, miniature submarine resistance and the like.

The invention discloses a solid cool air micro-propelling system. The solid cool air micro-propelling system comprises an air storage chamber, a magnetic valve and a mini-type resistive heater which are sequentially connected, wherein the air storage chamber is provided with a pressure sensor and a plurality of nitrogen generators; the mini-type resistive heater is composed of a silicon wafer and a heating resistor; the silicon wafer is internally provided with a vent groove and a Laval type nozzle; the air inlet end of the vent groove is connected with the magnetic valve; the air outlet end of the vent groove is connected with the Laval type nozzle; the heating resistor is arranged on a glass substrate; the silicon wafer is bonded with the glass substrate. The solid nitrogen generators replace a high-pressure nitrogen storage tank to store nitrogen, and the size and mass of the whole system are reduced greatly; nitrogen is heated by the mini-type resistive heater before being sprayed out from the nozzle, and then is sprayed out after reaching a certain temperature, thrust generated after the nitrogen is sprayed out is increased, the propelling efficiency of the whole micro-propelling system is improved, thrust is small and precision is high.

The invention discloses a paddle steamer. The paddle steamer comprises a boat body and a ship power device arranged on the boat body and composed of a host-driven propeller, wherein the propeller consists of two paddle wheels symmetrically arranged on the two sides of the boat body; and the lower edges of the paddle wheels are lower than the bottom surface of the boat body. The invention has the advantages that the modern host is combined with the traditional paddle wheels; the installation mode that the lower edges of the paddle wheels symmetrically arranged on the two sides of the boat body are lower than the bottom surface of the boat body is adopted, thus when the paddle wheels rotate at high speed, blades which are evenly distributed on the outer edges of the paddle wheels in the radial direction continuously and fast flap water surface backward and downward in turn; and as the density of water is high, enough forward and upward reacting force can be obtained, the upward component force supports the boat body to leap out of water, and the forward component force pushes the boat body to move forward. Therefore, only the tail of the boat body contacts a little part of water surface and slides on water surface and the balance of the boat body is maintained, thus avoiding extremely large water resistance, remarkably increasing the propelling efficiency and realizing the high-speed and economic navigation of ships.

The invention relates to an underwater biomimetic robotic fish which comprises a main cabin body, pectoral fins respectively arranged on both sides of the main cabin body, a driving module arranged on the rear part of the main cabin body, a fan-shaped tail fin arranged on the rear part of the driving module and connected with the driving module through upper and lower connecting rods, and a dynamic seal mechanism arranged between the upper connecting rod and the output end of the driving module; the main cabin body comprises a casing with windows on left and right sides, and a bottom window, each window is respectively connected with a side cover and a bottom cover, and a sliding block device is connected with the bottom cover; the sliding block device comprises a front bracket and a rear bracket arranged on the bottom cover, the front and rear brackets are connected with a screw rod and a polished rod through bearings, a sliding block is nested on the screw rod and the polished rod, one end of the screw rod penetrates through the rear bracket to connect with a lower gear, the lower gear is meshed with an upper gear, the upper gear is fixedly connected the output end of a serial motor, and the serial motor is fixed on the upper part of the rear bracket. The invention has good underwater three-dimensional movement ability, certain environment adaptability, stability and reliability, flexible movement, is used for underwater resource exploration, marine salvage, rescue and other tasks, and also can play a significant role in future sea battle missions.

A method of generating a model of propulsive efficiency for an autonomous underwater vehicle (AUV) is based on a multilayer perception neural network model using data from aquatic species, such as undulatory fin propulsion in the knifefish (Xenomystus nigri), and a sensitivity analysis is used to lower the number of required inputs. The model of propulsive efficiency allows an AUV to achieve high values of propulsive efficiency over a range of forward velocity, giving a lowered energy drain on the battery. In an embodiment, externally monitored information, such as that on flow velocity, is conveyed to an apparatus residing in the vehicle's control unit, which in turn signals the locomotive unit to adopt kinematics, such as fin frequency and amplitude, associated with optimal propulsion efficiency. Power savings could protract vehicle operational life and / or provide more power to other functions, such as communications.

The present invention is one kind of fish-shaped nacelle propeller and belongs to the field of ship propelling technology. The fish-shaped nacelle propeller of the present invention includes nacelle body, support, motor bearings, shaft coupling, screw propeller, screw propeller bearing, propelling motor stator, propelling motor rotor, tail fin and two side fins. The nacelle body is connected with the support; the screw propeller has one end fixed via the screw propeller bearing inside the nacelle body; the propelling motor stator is set via the motor bearings and the support inside the nacelle body; the propelling motor rotor shaft is connected to the shaft of the screw propeller via shaft coupling; and the tail fin and the side fins are connected to the nacelle body smoothly. The present invention has optimized streamline outer shape, effectively improved tail flow field, improved hydrodynamic performance, and raised propeller efficiency.

A thrust generator for thrust system is provided. The thrust generator includes an air inlet configured to introduce air within the thrust generator and a plenum configured to receive exhaust gas from a gas generator and to provide the exhaust gas over a Coanda profile, wherein the Coanda profile is configured to facilitate attachment of the exhaust gas to the profile to form a boundary layer and to entrain incoming air from the air inlet to generate thrust.

The invention discloses a marine electromagnetic counter-rotating hub-type rim water jet propeller, which comprises a water spray pipe, an annular permanent magnet motor device, a counter-rotating rim propeller, a bearing assembly and a sealing assembly; wherein, the water spray pipe includes a shell The body and the water outlet and water inlet arranged at both ends of the shell; the annular permanent magnet motor device and the counter-rotating rim propeller are arranged on the shell near the water outlet; the counter-rotating rim propeller includes a first-stage rim propeller and a second-stage rim propeller The rim propeller, the first-stage rim propeller and the second-stage rim propeller are connected to each other through a bearing assembly; there are two annular permanent magnet motor devices, which are respectively arranged on the outer shell of the first-stage rim propeller and the second-stage rim propeller On the body; the annular permanent magnet motor device and the bearing assembly are provided with a sealing assembly. The invention has the advantages of high maneuverability, high propulsion efficiency, high ship stability, low vibration and noise, high strength, safety and reliability, and the like.

The invention relates to a high-speed rounded bilge type boat utilizing an air cavity to reduce resistance. The high-speed bilge type boat of the invention comprises a boat body, a propulsion system and a gas supply system arranged in the boat body, and is characterized in that the bottom surface of the boat body is provided with an inward concave air cavity; the air cavity is composed of two arcboard lateral fins; the width of the air cavity gradually increases from the head part to the tail part of the boat body, the front part of the air cavity is provided with a head platform, and the rear part of the air cavity is provided with a wedge bulge; and an air inlet used in the gas supply system to supply gas to the air cavity is arranged at the fault-step position of the head platform. The high-speed rounded bilge type boat of the invention is provided with the reasonable air cavity structure, the head platform is arranged at the front part of the air cavity, and the wedge bulge is arranged at the rear part of the air cavity, thus ensuring the stability of inlayer air in the air cavity and the resistance reducing function of the air cavity, being capable of effectively reducing frictional resistance in the sailing process of the boat body, saving fuel materials and effectively improving the propulsive efficiency.

An oscillating-foil type underwater propulsor with a joint provided in the invention, the propulsor including a streamline foil having a foil surface being parallel to a water surface and a span length of at least twice as long as an average chord length of the streamline foil, and a heaving mechanism undergoing heaving motion perpendicular to a propulsion direction of the propulsor and having a transmission section, wherein the transmission section is pivotally connected to the streamline foil to form a joint, the joint being provided at the middle of the span length and having a rotation center located within a circular area, which has a radius of one third of the average chord length and is centered at the point one third of the average chord length ahead of the lifting center of the streamline foil.

The invention discloses a ship propeller which mainly comprises a cylinder and a jet pipe, wherein the cylinder is provided with a compressed air inlet, a fuel nozzle and an ignition unit. The ship propeller is characterized in that both the cylinder (1) and the jet pipe (2) of the propeller work in water, compressed air and fuel are respectively introduced into the cylinder through the compressed air inlet (3) and the fuel nozzle (4) and are subject to burning explosion under the action of an ignition unit (5), and burning explosion products directly jet out a water column in the jet pipe (2) so as to generate a thrust force based on the reactive force. Compared with the known ship propelling system, the propeller uses the cylinder part as the power unit, uses the jet pipe part as the propelling unit and realizes the integration of the power unit and the propelling unit, thereby having the advantages of high propelling efficiency, high energy utilization efficiency, high economical efficiency, simple structure and high operational reliability. The invention includes multiple implementation schemes, can realize the ultra high-power propulsion by modular combination and is applicable to various ships.

The invention discloses a lightweight high efficiency low noise duct type four-level electric fan propeller, and belongs to the aviation propulsion technical field; the propeller employs a brushless DC motor two motor shafts on two sides of the motor; the motor shaft on one side is fixed on a head cover, and the motor shaft on the other side is fixed on a tail cover; a first level fan, a first level flow deflector, a second level fan, a second level flow deflector, a third level fan, a third level flow deflector, a fourth level fan and a fourth level flow deflector are arranged in sequence from the head cover to the tail cover; the airflow passing the inner side of the engine are pressurized for four times; in addition, the inner wall of a nacelle and the outer wall of a radome are respectively provided with a noise reduction liner. The propeller is small in size, high in propulsion efficiency, can reduce operation noises, can reduce propeller weight, thus reducing making cost and maintenance cost, reducing harmful gas discharge, and improving propeller thrust weight ratio.

The invention relates to an underice detecting system applied to ice hole deployment and recovery. The underice detecting system can enter into underwater through an ice hole with limited hole diameter, and comprises a bearing cable used for being hung in the ice hole to uplift and down-put the underice detecting system, a converting and cable retracting device fixedly connected with the bearing cable driving the converting and cable retracting device to move and used for underwater retraction of a connection ROV, the connection ROV connected with the converting and cable retracting device toform a cylindrical whole structure moving in the ice hole with the limited hole diameter and can be separated from the converting and cable retracting device to collect water samples or sediments andconnected with an underice detecting AUV, and the underice detecting AUV used for being separated from the connection ROV to detect underwater or be connected with the connection ROV to carry out charging and data communication and capable of being fixed to the connection ROV to move along the connection ROV. According to the underice detecting system applied to ice hole deployment and recovery, detecting time and range underice can be improved, and the detecting efficiency is improved.

The invention discloses a pre-rotation triangular conduit for a right-handed rotation single screw vessel. The pre-rotation triangular conduit has a fan-shaped structure; seen from the rear side of a screw propeller, a second blade and a first blade are arranged from top to bottom on the left side of a longitudinal central line of a propeller hub of the screw propeller, and a third blade is arranged on the right side; a blade back of a guide plate is fixedly connected with a blade tip of the first blade, a blade tip of the second blade and a blade tip of the third blade respectively; the included angle range of the first blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees; the included angle range of the second blade and the longitudinal central line of the propeller hub of the screw propeller is 25-30 degrees; and the included angle range of the third blade and the longitudinal central line of the propeller hub of the screw propeller is 70-75 degrees. By using the principle of pre-rotation before the propeller and screw propeller upper inlet flow acceleration, the pre-rotation triangular conduit is a piece of body energy saving equipment with more uniform inlet flow of the screw propeller disk; and importantly, the energy lost due to rotation of a wake flow field of the screw propeller is reduced, the screw propeller propulsive efficiency is improved and the additional form resistance due to tail flow separation is reduced.

A planet surface landing system comprises a loading cabin, connecting mechanisms and one or more rocket and rotor combined engines. The loading cabin is used for loading an effective load and storing a propellant. The rocket and rotor combined engines are connected with the loading cabin through the connecting mechanisms. Each rocket and rotor combined engine comprises a shell, a rotor and a power system arranged in the shell and used for driving the rotor, wherein the rotor is arranged at the top of the shell, connected with the power system in the shell, and driven by the power system to rotate to generate aerodynamic lift so as to provide resistance required for deceleration of the planet surface landing system during landing. By adjusting the rotating speeds of the rotors on the rocket and rotor combined engines, pitching, rolling and yawing motion of the whole planet surface landing system are achieved. Rockets and the rotors are combined and used as the power, and energy taken away by rocket exhaust is fully reduced; and aircraft attitude control is achieved by changing the rotating speeds of the rotors, and problems existing in the prior art can be better solved.

The invention provides a sea and air amphibious propeller. The propeller comprises a ducted propeller stator, air propellers, air propeller rotors, ducted propellers and ducted propeller rotors, wherein a group of magnets is fixed on the air propeller rotors and the ducted propeller rotors respectively, the air propeller rotors and the ducted propeller rotors rotate coaxially and are nested to thesame ducted propeller stator, and two coils corresponding to the air propeller rotors and the ducted rotors respectively are embedded into the ducted propeller stator. The air propellers are used foraerial propulsion, water propellers are used for underwater propulsion, and the both can work independently. During underwater propulsion, the air propellers are folded back and rotated at a lower speed to eliminate the resistance to the air propellers, and the shaftless ducted propellers work to generate propulsion. In the air, the air propellers are unfolded and rotate to generate propulsion, and the ducted propellers assist the operation. The shaftless ducted propellers have good propulsion performance under water, the air propellers are suitable for working in the air, and the air propellers are combined with the shaftless ducted propellers to realize efficient propulsion and free switching under water and in the air.

The invention relates to a reflecting type laser-electromagnetic field coupling thrustor which comprises a laser system, an electromagnetic accelerating electrode assembly and a static electric fieldassembly. The electromagnetic accelerating electrode assembly comprises an electromagnetic accelerating cathode, an electromagnetic accelerating anode and an electromagnetic accelerating electrode power source; the static electric field assembly comprises a static electric field accelerating electrode, a working medium and a static electric field accelerating power source, the static electric field accelerating power source provides power for the working medium and the static electric field accelerating electrode, and a potential difference is formed between the working medium and the static electric field accelerating electrode to form a static electric field; laser plasmas generated by ablation of the working medium by laser beams enter the static electric field, when the laser plasmas accelerated by the static electric field move to the position between the electromagnetic accelerating cathode and the electromagnetic accelerating anode, discharge arcs can be induced to be generated,the laser plasmas are heated by the discharge arcs and are further ionized, the laser plasmas are sprayed out in an accelerated manner under the joint effect of lorentz force and aerodynamic force, and thrust is accordingly generated. The reflecting type laser-electromagnetic field coupling thrustor has the beneficial effects that the thrust is adjustable, the thrust efficiency is high, and the thrust density is large.

The invention discloses a workboat moving in a hydraulic stay bar mode and belongs to workboats. The workboat structurally comprises a workboat body, a control cabinet and a working device, wherein the working device and the control cabinet are arranged on the upper portion of the workboat body, hydraulic stay bar devices are arranged on the front side and the rear side of the workboat body respectively, the hydraulic stay bar devices and the control cabinet are connected with a hydraulic pump station respectively, and the hydraulic pump station is arranged on the upper portion of the workboat body. The workboat based on the bionics theory of how hippos moving in water and adopting a theory of poling a boat through bamboo spars uses a hydraulic cylinder as power and moves in a stay bar mode, and the workboat can be used for tugging of fleets moving shallow channels in inland rivers, can be used for performing dredging, transportation and other operations in mire lands severe in sedimentation or shallow rivers and lakes with tufty reeds and aquatic plants, can move silently close to water bottom under water and can be used for executing special operations as subwater sneaking devices.

The invention relates to an electric propulsion converter device for an ocean fishing boat, and in particular relates to an electric propulsion converter for an ocean fishing boat. The electric propulsion converter comprises a cabinet; a power unit, a control unit, a cooling unit and wiring harnesses are arranged in the cabinet; the power unit comprises a rectifier module, an inverter chopper module and a direct-current support capacitor; the rectifier module comprises a rectifier input copper bar, a rectifier power module and a main contactor; the inverter chopper module comprises a three-phase inverter output copper bar and an inverter chopper power module; the control unit comprises a traction control unit, a sensor, a filter and a power supply; the cooling unit comprises a heat exchanger, a water pump, a water replenishing box, a pipeline, a temperature sensor, a pressure sensor, a valve and a cooling pipeline; and the wiring harnesses include low-voltage wiring harness and high-voltage wiring harness. Electric transmission based on the converter gradually replaces the traditional transmission mode by the advantages, such as low speed, large toque, uniform low-speed operation, flexible configuration and high reliability; the electric transmission is the mainstream development direction of ship propulsion; and thus, the electric propulsion converter has wide application prospect.