159results about How to "Improve propulsion performance" patented technology

A bionic underwater propeller in a way of hydraulic driving body tail fins comprises more than two sections of swing devices, a tail fin and a hydraulic control unit. The swing device comprises a T-shaped stent and two hydraulic oil cylinders arranged symmetrically on the T-shaped stent; the ends of all the T-shaped stents of the swing device are sequentially articulated with the beginning end; between the adjacent T-shaped stents, relative rotation can be done; one end of the hydraulic oil cylinder is articulated with the T-shaped stent and the other end is articulated with the T-shaped stent of the next section of the swing device by means of a piston rod; each hydraulic oil cylinder is respectively provided with a nozzle tip joint connected with the hydraulic control unit; in the same moving period, when the piston rod of the hydraulic oil cylinder is in an extending stroke, the piston rod of the other hydraulic oil cylinder is in a retraction stroke; the tail fin is connected with the last section of the swing device. The bionic underwater propeller has the advantages of compact structure and high transmission efficiency, which can flexibly imitate the tail fin way of fish body to move, thus providing propulsive forces for the movement of in-water aircrafts.

The invention relates to a machine jellyfish, in particular to a machine jellyfish driven by an embedded type cylindrical motor. The problem that an existing bionic jellyfish robot is limited in moving range, small in effective water spraying size and small in driving force and is not suitable for a complex water flow environment in nature is solved. A mechanical abdominal cavity end cover, a sleeve and a bottom disc base of the machine jellyfish are in sealing connection from top to bottom in sequence. A cylindrical traveling wave ultrasonic motor is arranged on the bottom disc base. A transmission cam is located in the middle of the cylindrical traveling wave ultrasonic motor. A plurality of piezoelectric ceramic pieces are evenly distributed on the outer cylinder wall of the cylindrical traveling wave ultrasonic motor. A plurality of rectangular bosses which are arrayed vertically are evenly distributed on the inner cylinder wall of the cylindrical traveling wave ultrasonic motor. The other end of each arm pushing force rod is connected with a multi-joint arm. Each arm pushing force rod and the sleeve are connected through a pushing force rod guiding flange. An auxiliary spring is arranged between each pushing force guiding flange and an arm pushing force rod close to one side of a double-idler-wheel part. The machine jellyfish is used for unmanned underwater carrying.

The invention discloses an underwater vehicle comprising a body, a first tail fin component, a second tail fin component and a pectoral fin component, wherein, the first tail fin component and the second tail fin component can be connected onto the body asway side by side along the transverse direction of the body; the pectoral fin component is connected onto the body. The underwater vehicle of the invention has high-efficiency propulsion capability and high maneuverability, and can be widely applied to the fields of military affairs, scientific research, resource exploration and the like.

The invention discloses a structure for preventing backflow from entering an air intake duct of an air-breathing pulse detonation engine. The air intake duct of the engine is formed by an air intake housing and a rectification air intake cone. An annular passage is formed by a circular tube section and a cylinder. The rectification air intake cone is fixed to the cylinder. An adjustable inner plug is installed in the cylinder through threads. A diversion fin cylinder is arranged on the cylinder in a sleeved mode and fixed by the rectification air intake cone. The cylinder is fixed to the circular tube section through a fuel oil tube. Air enters a detonation chamber through the air intake duct and the annular passage, and fuel oil is axially sprayed into the detonation chamber through the fuel oil tube and mixed with the air. After ignition and detonation, the backflow enters an inner cavity of the cylinder against the incoming flow direction, enters the annular passage formed by the circular tube section and the cylinder through two rows annular slotted holes of the inner cavity, the backflow changes the direction and interacts with backflow passing by the cylinder under the diversion action of the diversion fin cylinder on airflow, the total pressure of the backflow is gradually reduced, the flow rate of the backflow entering the air inlet duct is reduced, and therefore the propulsion performance of the engine is greatly improved.

The invention provides a biomimetic machine shark, and relates to the field of biomimetic underwater vehicles. The biomimetic machine shark comprises a shark head, a pectoral fin system, a dorsal fin,a shark body framework, a device cabin and a shark tail driving system; the shark head is connected with the shark body framework through a head steering engine, and the head steering engine is fixedto the front part of the shark body framework and can control the shark head to swing left and right; the pectoral fin system realizes floating upward and diving downward of the machine shark duringmoving by changing the angles of pectoral fins; a dorsal fin is fixed to the shark body framework, the device cabin is placed in the shark body framework, and the shark body framework is provided withthreaded holes to connect steering engines and other extending devices; a singlechip microcomputer, batteries and the like are placed in the device cabin; and the shark tail driving system realizes the condition that a main steering engine drives a whole tail part to swing flexibly through traction of a linkage piece, and a caudal fin steering engine is arranged at a last caudal joint to controla caudal fin to swing individually. According to the biomimetic machine shark, the structure is simple, the biomimetic effect is vivid, the expansibility is high, and three-dimensional motion under water can be realized.

The invention discloses an underwater towing body controlled by a front-edge-rotating cylindrical wing. Forced sinking hydrofoils of the underwater towing body adopt symmetrical airfoil profiles, andare symmetrically arranged on the two sides of the front portion of a main cavity, two rotating cylinders are symmetrically arranged at the front ends of the profile faces of the forced sinking hydrofoils relative to the main cavity, and are connected with a speed adjusting motor located inside the main cavity through rotating-cylinder rotating shafts; ducted propellers are symmetrically arrangedon the two sides of the back ends of the forced sinking hydrofoils; a transverse horizontal fixed empennage is arranged at the tai lend of the main cavity, and vertical streamlined flap type rudders are symmetrically arranged at the two ends of the transverse horizontal fixed empennage respectively; a flap is arranged at the tail end of each vertical streamlined flap type rudder, and is connectedwith a flap angle control device. According to the underwater towing body controlled by the front-edge-rotating cylindrical wing, by changing the rotating speeds and the rotating directions of the rotating cylinders at the front ends of the forced sinking hydrofoils, attack angles of the forced sinking hydrofoils can be efficiently and flexibly adjusted, and the aim of changing the motion trail ofthe vertical direction of the towing body is achieved; on this basis, the thrust directions of two-side propellers are changed through assisting, and directional floating and sinking can be achieved.

The invention discloses an underwater bionic propelling device with controllable rigidity. The underwater bionic propelling device with the controllable rigidity comprises a bionic propelling device body, variable-rigidity joints, joint connecting frameworks and a bionic fish tail fin, wherein the bionic propelling device body is composed of two or more variable-rigidity systems; each variable-rigidity system is composed of one variable-rigidity joint and one joint connecting framework; and the joint connecting framework in each variable-rigidity system is rotationally connected with a movable part in the middle of the variable-rigidity joint of the front system so that swinging of the underwater bionic propelling device can be achieved. The variable-rigidity joints change the magnetic field intensity by changing the current of magnetic induction coils, and accordingly the joint rigidity is changed. By means of the underwater bionic propelling device with the controllable rigidity, while a robot carries out different tasks in the same environment, the rigidity of the robot can be adjusted, and the optimal propelling performance of the tasks is achieved; the rigidity of the robot can also be changed in complicated environments so that the environmental adaptability can be improved; and meanwhile, in a traveling cycle, the joint rigidity of the bionic propelling device can be changed so that the propelling performance can be improved and the optimal propelling state can be achieved.

The present invention provides a marine duct that can be easily manufactured while maintaining performance as an energy-saving device, a manufacturing method of the marine duct, and a ship with a marine duct provided with the marine duct. The ship duct (4) has a duct outer plate (10) which is a part of a cone whose bow side is larger in diameter than the stern side and whose upper side is longer than the lower side, and is housed in the duct outer plate (10) with the upper side longer than the lower side. A cylindrical stern inner panel (20) with long sides, and a bow inner panel (30) accommodated inside the duct outer panel (10). The stern side edge (12) of the duct outer plate (10) is connected with the stern side edge (22) of the stern side inner plate (20), and the bow side edge (11) of the duct outer plate (10) and the bow side inner The bow side edge (31) of the plate (30) is connected, and the stern side edge (32) of the bow side inner panel (30) is connected to the bow side edge (21) of the stern side inner panel (20).

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 provides a variable ship length type wave energy underwater vehicle. The variable ship length type wave energy underwater vehicle comprises a wave energy underwater vehicle body, whereinthe wave energy underwater vehicle body comprises a ship body, a hydrofoil which is mounted at the lower part of the ship body through a support, and a rudder which is mounted at the tail part of theship body; the ship body comprises three parts, namely, a head section, an intermediate section and a tail section; and the intermediate section is a telescoping section. According to the variable ship length type wave energy underwater vehicle, the length of a ship in the sea with different wave conditions can be controlled; compared with a fixed ship length type wave energy underwater vehicle,the variable ship length type wave energy underwater vehicle has the advantages that the ship length can be properly changed so as to improve the wave energy utilization efficiency of the wave energyunderwater vehicle; in case of a long wave height condition, the ship length can be increased in order to increase the longitudinal swinging and heaving range of the ship, and as a result, the propelling performance of the underwater vehicle can be improved; in case of a short wave height condition, the ship length can be decreased to reduce the rotating inertia, thus the ship body moving range isexpanded, and as a result, the wave energy can be effectively utilized to propel.

The invention provides a pulse detonation pushing device based on a regenerative cooling structure. Based on the regenerative cooling structure, a convection / impact composite type heat exchange methodis adopted, liquid fuel oil is heated, catalyzed and cracked through heat radiation of detonation combustion, micromolecule gas fuel excellent in detonation performance is generated, the time and distance of deflagration to detonation transition (DDT) of a pulse detonation engine can be effectively shortened, and meanwhile efficient cooling of the wall face of a detonation pipe can be achieved. The catalytic and cracking fuel oil pretreatment method is adopted, the detonation performance of fuel is effectively improved, and meanwhile the pushing performance and safety of the engine are improved. The regenerative cooling structure provides a heat source for a catalytic and cracking reaction, and meanwhile airborne fuel oil is adopted as cooling media to cool the wall face of the detonationpipe. Temperature distribution of the wall face of the detonation pipe is considered, the convection / impact composite type cooling manner is adopted on the DDT segment of the detonation pipe, and a microchannel inner convection heat exchange manner is adopted in the detonation spread segment.

The invention relates to two types of static super electric energy machines. The two types of static super electric energy machines being reconstructed on the basis of series resonance, parallel resonance and a transformer have no rotary motion parts. The static super electric energy machine mainly comprises a high-quality inductor and a high-quality capacitor which form a series resonance or parallel resonance circuit, resonance can be generated in a respective circuit only through inputting an AC current having frequency identical to circuit natural oscillation frequency, large-power electric energy can be pushed at an output end, and the output power is made to be greatly larger than an input power; inductance or capacitance can be automatically tuned according to induction electromotive force change of the output end, the static super electric energy machine can cooperate with a chargeable cell or a super capacitor, an inverter, an intelligent controller and a rectifier to form an independent static power generation system, no pollution and zero exhaust can be realized, and inexhaustible electric energy can be provided for various types of equipment needing electric energy.

The invention relates to the field of a bionic robot, and provides a water quality detection bionic mechanical snake. The water quality detection bionic mechanical snake comprises a snake head, a snake body and a snake tail in sequential connection, wherein a water quality sensor is arranged on the snake head and is used for detecting the located water quality factor of the bionic mechanical snake; at least one rod end bearing and at least one bionic framework are arranged in the snake tail; the bionic framework and the rod end bearing are alternately connected; one side, far away from the rodend bearing, of the bionic framework positioned at the end part is connected with the inner end surface, near the snake body, of the snake tail. The bionic mechanical snake provided by the inventionhas the advantages that the water quality monitoring sensor is arranged on the snake head, so that the bionic mechanical snake can monitor the water quality condition in a position in which the bionicmechanical snake arrives; the snake tail part of the bionic mechanical snake uses the rod end bearing and the bionic framework in the alternate connection; the driving capability of the snake tail isimproved; further, the propulsion capability of the whole bionic mechanical snake is improved.

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.

The invention discloses a cable laying apparatus. According to the cable laying apparatus, the laying efficiency can be improved, and complete automation of cable laying is realized; propulsion is performed by employing propulsion belts so that the propulsive force is large; a boosting wheel is provided, and the boosting wheel is provided with fine needles so that the wall-holding force of the boosting wheel during rolling can be guaranteed, the propulsion of the propulsion belts is guaranteed, and the propulsion effect is greatly improved; and the applicability is high, the requirement of diameters of various laying pipelines can be met, the rolling speed of the boosting wheel and the speed of the propulsion belts can be consistent during usage, and long-distance cable laying can be wellrealized.

According to the invention, the blade (11), intended to be mounted on the hub (12, 13) of a turbomachine propeller so that an empty space (18, 18A, 18B) is defined between the base (14A) of the blade (14) and the face of the hub (12, 13) facing said base (14A), comprises retractable blanking means (16, 17) able reversibly to occupy at least one of the following two positions: - a deployed position in which the retractable blanking means at least partially blank off said empty space (18, 18A, 18B); and - an extreme retracted position in which said retractable means are kept out of said empty space.

The invention discloses a shock wave combustion inducing ramjet and a shock wave combustion inducing stamping starting method. The ramjet comprises a variable-wedge-surface three-dimensional side pressure gas inlet way, a fuel injector, a combustion chamber and a tail spraying pipe. The variable-wedge-surface three-dimensional side pressure gas inlet way comprises an upper wall face and a side wall face. The upper wall face comprises a first wedge face and a second wedge face, wherein the slope of the second wedge face is larger than that of the first wedge face. The side wall face is of an inwards-contracting type structure, and the side wall face and the upper wall face are connected through arc transition. The fuel injector is arranged on the first wedge face, the combustion chamber communicates with the variable-wedge-surface three-dimensional side pressure gas inlet way, and the combustion chamber is not provided with the fuel injector. The tail spraying pipe communicates with thecombustion chamber. By means of the shock wave combustion inducing ramjet, combustion is organized in a detonation manner, the combustion distance is shorter, mixing and combustion of fuel and gas are more sufficient, the length of the combustion chamber can be designed to be shorter, and the pushing performance of the ramjet can be greatly improved.

The invention discloses a protection mechanism for a high-voltage electric cabinet. The protection mechanism comprises an outdoor high-voltage electric cabinet body, a positioning block is fixedly installed at the top of the outdoor high-voltage electric cabinet body, and a square inserting groove is formed at the top of the positioning block. Square clamping grooves are formed at the front side and the rear side of the inner wall of the square inserting groove, extrusion devices are fixedly installed in the two square clamping grooves, and a limiting block is fixedly installed at the rear side of the right side of the positioning block. According to the cooperative use of the outdoor high-voltage electric cabinet body, the positioning block, the square inserting grooves, the square clamping grooves, the extrusion devices, the extrusion block, a connecting block, a pushing block, a threaded through hole, a threaded rod, a rotary button, a limiting block, a square inserting block, a clamping mechanism, a square groove, an extrusion spring, a square clamping block, a protective cover, a strip-shaped groove, a sliding groove and a sliding block, the problem that the existing protection effect is poor, is solved. The protection mechanism for the high-voltage electric cabinet has the advantage of better protection effect.

The invention discloses a copper based metal organic skeleton material and a preparation method thereof. The preparation method comprises the following steps: dissolving an organic ligand namely 2,7-bis(3,5-dibenzoic acid)-9-fluorenone and a copper source into an amine solvent and deionized water, evenly stirring in a hermetical space; then adding a nitric acid solution, evenly mixing, then transferring the enclosed container to a baking oven to carry out crystallization; subjecting the obtained blue-green hexagonal crystals to multi-stage solvent extraction and solubilization treatments with N,N'-dimethyl formamide and methanol in sequence, and performing vacuum drying to obtain the pure metal organic skeleton material. The metal organic skeleton material comprises a secondary structural unit, which is formed through coordination between a Cu2(COO)4 structural unit and oxygen atoms of carboxylic acid. The secondary structural units are linked to each other so as to form a three dimensional channel structure. The provided copper based metal organic skeleton material is especially suitable for selective adsorption separation of mixed gas (acetylene, ethylene, and ethane), the operation conditions are mild, and the service life is long.

Disclosed is a twin skeg ship of which propulsion performance (propulsion efficiency) can be further enhanced. The twin skeg ship (10) is provided with a pair of right and left skegs (3) on the bottom (2) of the ship at the stern. In such a range as the flow just before a propeller (4) fixed to the skeg (3) through a propeller shaft (4a) has a component in the same direction as the rotational direction of the propeller (4), a reaction fin (5) consisting of a plurality of fins (5a) is provided to extend radially from a bossing (6) bonded to a stern frame (7) located at the rear end of the skeg (3) or from a fin boss provided on the bossing (6).

The method involves executing an elliptic type combined movement in a pre-needling apparatus (3), where the combined movement includes back-and-forth movement and a forward movement of pre-needling needles (47). The forward movement of the needles is utilized for providing a movement to a stack of the apparatus (3) for allowing the introduction of the stack in a consolidation apparatus (2). The stack is directly passed from the apparatus (3) to the apparatus (2), where the apparatuses (2, 3) are combined in a common case (11) for forming a single machine. An independent claim is also included for an installation for working a stack in a pre-needling apparatus.

The invention aims to provide a flange power-generating water-spraying thruster. The thruster comprises an inflow pipeline, a generator, an impeller and a water pump, wherein the water pump is arranged in the inflow pipeline; the generator is mounted on a shall of the inflow pipeline; the impeller connected with the generator is arranged in the inflow pipeline; the inner end parts of the impeller are all connected with an impeller central hub; the impeller and the impeller central hub are arranged at the rear part of the water pump in the inflow direction. The thruster can provide extra electrical energy for the normal operation of a ship; in addition, the impeller can generate beneficial interference on the preposed water pump to improve the propulsion performance and the efficiency; the power generation system has excellent prospects in practical application in the recent context of energy conservation and emission reduction.

The invention discloses a metal organic skeleton material and a preparation method thereof. The metal organic skeleton material comprises a secondary structural unit, which is formed through coordination between a Cu2(COO)4 structural unit and oxygen atoms of carboxylic acid. The secondary structural units are linked to each other so as to form a three dimensional channel structure. The chemical formula of the skeleton material is C29H14Cu2O10. The preparation method comprises the following steps: dissolving an organic ligand namely 2,7-bis(3,5-dibenzoic acid)-9-fluorenone and a copper source into an amine solvent and deionized water, evenly stirring in an enclosed container; then adding a nitric acid solution, evenly mixing, then transferring the enclosed container to a baking oven to carry out crystallization; and washing and drying obtained blue-green hexagonal crystals to obtain the metal organic skeleton material. The metal organic skeleton material has a specific pore structure, and is especially suitable for selective adsorption separation of mixed gas (acetylene, ethylene, and ethane), the operation conditions are mild, and the service life is long.

The invention relates to an endoscope guide wire, which solves the problem that the conventional guide wire is easy to break, the problem that the pushing capacity is poor, the problem that the position into which the guide wire is inserted is difficult to judge and the like. The endoscope guide wire comprises a metal core wire and a visual identification mark covered on the surface of the metal core wire. The technical key points of the endoscope guide wire include: the metal core wire is made of an integrative elastic metal wire without a junction surface; the visual identification mark is arranged between the end part of a base section and the front end of a conical section of the metal core wire, and comprises a direct viewing mark part and an X-ray developing part; the direct viewing mark part is formed by a first direct viewing mark color ring, a second direct viewing mark color ring and a third direct viewing mark color ring which are connected alternately and have different colors; the X-ray developing part is formed by X-ray developing metal or an X-ray developing agent-containing envelope; and an ultrathin hydrophilic coating is covered on the surface of the visual identification mark. The endoscope guide wire has a reasonable structure; and on the basis of ensuring the direct vision and X-ray visuality which are required by the endoscope guide wire, the pushing capacity, sliding performance and the like of the guide wire inserted into an endoscope channel are improved comprehensively, and the operability and safety of the endoscope guide wire are improved obviously.

The invention provides a novel enclosed steel-concrete composite beam which comprises a C-shaped steel beam on the lower portion. The composite beam is formed by fixedly arranged profiled steel plates on an upper flange and in a beam rib of the C-shaped steel beam and pouring concrete on the whole face layer of the profiled steel plates. The novel enclosed steel-concrete composite beam is simple in structure, high in composite action, quick and convenient to construct, capable of realizing industrialized production, evident in economic benefit and capable of being applied to civil building floor structures and plays an active role in promoting housing industrialization.

The invention discloses a laser micro-propelling device and method based on nanometer fluid micro-droplet work mediums. The device comprises a thruster shell body, a work medium cabin body, an auxiliary gas storage tank and a microflow control assembly; the auxiliary gas storage tank and the work medium cabin body adopt an integrated design, and the auxiliary gas storage tank is communicated withthe work medium cabin body through an adjusting valve; the work medium cabin body is tightly connected with the thruster shell body, and the microflow control assembly penetrates through the work medium cabin body and the thruster shell body; the auxiliary gas storage tank is communicated with the microflow control assembly; the work medium cabin body is communicated with the microflow control assembly. Generation and manipulation of nanometer fluid micro-droplets are achieved through the microflow control assembly; focusing of incidence laser beams is achieved through a reflecting mirror of the inner surface of the thruster shell body, the nanometer fluid micro-droplets enhance absorption of irradiation laser and causes intensive crushing, and a counteractive propelling force is generatedon the surface of the thruster shell body. Structural integration and functional characteristics are remarkable, selection of the propelling work mediums is unique, and correspondingly the laser micro-propelling device has the propelling effects of high specific impulse, a high impulse coupling coefficient and high energy conversion efficiency and meanwhile makes a propelling process controllable.

The invention relates to a circular helical-line radio-frequency lightning protection method and a lightning protection device. Coaxial transmission lines are arranged inside outer conductor shells of the lightning protection device, and the coaxial transmission lines are supported by insulation media on the middle parts inside the outer conductor shells to form coaxial structures with outer conductors; the middle of the coaxial transmission lines are serially connected with a conical compensation transmission coaxial line and a helical line-type short-circuit wire; gas discharging pipes are arranged between the helical line-type short-circuit wire and an input-end outer conductor to separate the helical line-typed short-circuit wire from the input-end outer conductor, and the conical compensation transmission coaxial line, the helical line-typed short-circuit wire and the gas discharging pipes form a feeding and lightning protection circuit; and the lightning protection can be realized through the lightning protection circuit with the feeding function. A plurality of radio-frequency systems can be simultaneously covered, and the normal work of third-generation (3G) radio-frequency receiving-transmitting system such as global system for mobile communication (GSM), code division multiple access (CDMA), time division-synchronous code division multiple access (TD-CDMA) and the like can be guaranteed; and at the same time, the short-circuit wire adopts a helical-line structure, the compensation coaxial wire adopts the conical design, and the input-end outer conductor and an output-end outer conductor are in a circular structure, so the size of the product is small, the product is simple and convenient to connect, the contact resistance is effectively reduced, and the transmission performance of the product is improved.

The invention relates to a vector magnetic nozzle composed of interlaced electromagnetic coils for electric propulsion. The vector magnetic nozzle composed of the interlaced electromagnetic coils forelectric propulsion comprises an electric thruster, the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil, wherein the electric thruster generates a plasmaflow beam, the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil are fixed together in an interlaced mode, certain angles are formed between axes of the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil and an axis of the electric thruster respectively, the axes of the first electromagnetic coil, the secondelectromagnetic coil and the third electromagnetic coil are evenly distributed along a space, the first electromagnetic coil, the second electromagnetic coil and the third electromagnetic coil are energized with different magnitudes and directions of exciting currents respectively, the asymmetric vector magnetic nozzle is generated, thus the plasma flow beam is guided to expand and accelerate in arequired direction, and a required thrust vector is generated.

The present invention relates to a multiple-condition propulsion performance optimum design method of a composite material propeller, and aims at solving the problem that an existing composite material propeller design method is imperfect. The multiple-condition propulsion performance optimum design method comprises the steps of (1) starting; (2) determining a pitch value pi<0> of the composite material propeller at a design advance of J<0>; (3) determining [theta]0.75R at a 0.75R position when the design advance is J<1>; (4) calculating [alpha]0.75R; (5) determining a geometrical pitch angle [theta]1 of the composite material propeller at the 0.75R position when the design advance is J<1>; (6) determining a geometrical pitch angle [theta]1 of the composite material propeller when the design advance is J<1>; (7) selecting a ply orientation angle and sequence of a composite material; (8) designing initial geometry of the composite material propeller; (9) calculating a geometrical pitch angle [theta]1' of the composite material propeller when the design advance is J<1>; and (10) determining the pitch angle |[theta]1'-[theta]1|, if |[theta]1'-[theta]1| >= 0.1 DEG, executing the step (7), and if |[theta]1'-[theta]1| < 0.1 DEG, over. The multiple-condition propulsion performance optimum design method is applied to the propeller field.