70results about How to "Guaranteed thrust" patented technology

The invention relates to an electric-propulsion-field microthrust transient measurement system based on a dynamic photoelastic method. In the invention, according to a thrust characteristic of electric propulsion, based on the dynamic photoelastic method, an optical elastic component is taken as a core so as to construct an optical path system; and through measuring real-time changes of an optical stripe image under a stress, instantaneous stress size and change conditions are displayed. The system comprises a laser, the optical elastic component, a high-speed transient image collector and a necessary image processing technology. The system is mainly used for collecting transient thrusts which are continuously changed along with time and are generated by a pulse-type propulsion system. The system is based on a stress-optical law. A photoelastic special material and a high-speed photography device are used to visualize the thrusts generated by a thruster, and a change process of the thrusts is especially recorded so as to research a change mechanism of the thrusts of an electric propulsion thruster.

The invention discloses an electric control power device with real-time controllable thrust and capable of repeatedly igniting and extinguishing. The electric control power device comprises a combustion chamber shell, a spray pipe, an electrode fixing sleeve, an electrode, an electric control solid propellant grain, a spring, a lead end insulating plate, an electrode fixing device, a thermal protection layer, an insulating layer, a resistance monitor, a voltage controller, a fixed sealing end and an electrode contact pin. According to the electric control power device, the voltage required byfirst ignition is reduced by changing the electrode structures of the initial combustion surface and the combustion surface of the propellant grain, and meanwhile, the stable combustion of the same end surface can be guaranteed through the electrode contact and end surface combustion modes; the resistance monitor is matched with the voltage controller, and the applied voltage is adjusted, so thatthe magnitude of the generated thrust is ensured to be certain; and the electrode contact pin is matched with the fixed sealing end for use, so that the sealing effect on a combustion chamber can be achieved, the electric control power device can be easily assembled with an external missile or an aircraft, and the purposes of rapid installation and disassembly are achieved.

The invention relates to a variable diameter screw propeller, which comprises propeller blades (3) and propeller hubs (4), and further comprises a rod connection mechanism (1), a drive mechanism (2), a propeller cap (5), a slide support mechanism (6) and a locking releasing mechanism (7), wherein the propeller cap (5) is arranged on the propeller hub (4), and provides installation spaces and top supports for the rod connection mechanism (1), the drive mechanism (2), the slide support mechanism (6) and the locking releasing mechanism (7), the drive mechanism (2) and the slide support mechanism (6) are fixed on the propeller hub (4), an output shaft of the drive mechanism (2) is connected with the rod connection mechanism (1), the propeller blades (3) are fixed on a guide outlet end of the rod connection mechanism (1), the bottom of the guide outlet end of the rod connection mechanism (1) is connected with the slide support mechanism (6), the slide support mechanism (6) provides support and guide for the rod connection mechanism (1), the drive mechanism (2) drives the rod connection mechanism (1) to drive the propeller blades (3) along the slide support mechanism (6) to stretch along a diameter direction of the screw propeller so as to change a diameter of the whole screw propeller disc, and the rod connection mechanism (1) is locked through the locking releasing mechanism (7) after the propeller blades (3) stretch in place.

The invention belongs to the field of wave energy driven marine aircrafts, and particularly relates to a hydrofoil with a wing plate limiting angle adjusting control device and a wave driven unmannedship. The wave driven unmanned ship is characterized in that hull pitching motion energy capturing and converting devices are located at the head and the tail and used for capturing hull pitching motion energy for limiting adjustment, the wing plate limiting angle adjusting control device is located in a support between a left wing plate and a right wing plate, the rotating angle amplitude is limited through the wing plate limiting angle adjusting control device when the hydrofoil rotates, a corner control device is controlled by an electric push rod, a control system gives a required rotationangle amplitude according to the sensed wave motion, and the rotation angle of a limiting device is controlled through stretching and retracting of the electric push rod. When a wave energy aircraftsails in sea waves with different wave heights and wavelengths, the limiting angle amplitude of the rotating motion of the hydrofoil is adjusted according to the preset rotating angle requirement, thewave energy aircraft can adapt to different sea conditions, it is guaranteed that the hydrofoil provides thrust under various sea conditions, and the comprehensive utilization efficiency of wave energy is greatly improved.

The invention provides a dumper for unloading a material on two sides by lifting the middle of a bottom plate of a carriage. The dumper comprises a bottom plate longitudinal beam, a left movable bottom plate, a right movable bottom plate, a left cover plate and a right cover plate which are positioned on left and right sides of the bottom plate longitudinal beam, and a lifting mechanism, wherein the lifting mechanism comprises an ejector rod which can freely stretch to lift, and is fixed on an auxiliary frame and positioned under the bottom plate longitudinal beam; the dumper is characterizedin that: a transverse beam which is transversely arranged in the left and right direction is fixed on the auxiliary frame; the left side of the left movable bottom plate and the right side of the right movable bottom plate are hinged with left and right sides of the transverse beam respectively; the right side of the left cover plate is hinged with the bottom plate longitudinal beam; the lower surface of the left cover plate is lapped with the upper surface of the left movable bottom plate; the left side of the right cover plate is hinged with the bottom plate longitudinal beam; the lower surface of the right cover plate is lapped with the upper surface of the right movable bottom plate; the top end of the ejector rod of the lifting mechanism is fixedly connected with the lower side face of the bottom plate longitudinal beam; the dumper also comprises a loading and unloading mechanism comprising one or more groups of structures of supporting arms, left side arms and right side arms which are arranged in the longitudinal direction and are in profile distribution; the supporting arms are positioned under the bottom plate longitudinal beam and the upper ends of the supporting arms are fixed on the lower side face of the bottom plate longitudinal beam; and the left ends of the left side arms are hinged with the right side of the left movable bottom plate.

The invention discloses a transportation device for mining, and relates to the technical field of mining. The transportation device for mining comprises a car hopper, a roller fixing shaft is fixedly installed at the bottom of the car hopper, and rollers are rotatably installed at the two ends of the roller fixing shaft. According to the transportation device for mining, dust generated in the collision process of ores in an ore containing bin can enter a dust collecting bin through a connecting channel, when the ores are placed in the ore containing bin, a driving mechanism can enable a sealing mechanism to seal the dust collecting bin, and at the moment, the dust accumulated in the dust collecting bin cannot be discharged; after the ores are taken out, the driving mechanism enables the sealing mechanism to be opened, dust accumulated in the dust collecting bin is discharged through a dust discharging groove, and due to the fact that the weight of the dust discharged at a time is large and the height of the dust discharging groove is low, large flying dust cannot be generated; and therefore, the dust in the car hopper can be automatically cleaned, and meanwhile the body health of operators cannot be affected.

The invention relates to the field of shipboard aircraft engine design, in particular to a control method for improving aerodynamic stability of a shipboard aircraft engine during takeoff, which comprises the following steps of: determining whether an aircraft is on the ground and thrust augmentation oil reaches a maximum state, and if so, executing control logic on the aircraft; using the engine outlet total pressure for reconstructing the engine inlet total temperature, using the reconstructed engine inlet total temperature for obtaining the rotating speed, the temperature, the thrust augmentation oil and the nozzle control plan value of the engine in the maximum state, and using the reconstructed engine inlet total temperature for obtaining the relative conversion rotating speed of a high-pressure rotor; using the relative conversion rotating speed of the high-temperature rotor for obtaining the angle control plan value of the adjustable blade of the gas compressor, and controlling the shipboard aircraft; and determining the state of the aircraft, and if the aircraft starts to slide forwards, quitting the aircraft control logic. The method has the technical effect of simultaneously ensuring the stability of the take-off state of the shipboard aircraft and the thrust demand.

The invention discloses an auxiliary stocking propelling device and a propelling method thereof. Stockings are conveyed from a starting end to a tail end on a transmission belt, and are about to stride on a static working panel. The stockings gain forward inertia force under the transmission of the transmission belt. Friction force exists between the stockings and the working panel, so that the own inertia force of the stockings is reduced gradually along with striding of the stockings on the working surface, and most stockings are clamped at the critical point. After the propelling device disclosed by the invention is arranged, thrust force for assisting the stockings in moving forwards is provided through a contact point between a roller and the transmission belt by using the inertial force gained by a roller on the transmission belt, so that certain acceleration is provided for the stockings, and the stockings can stride on the working surface smoothly.

The invention relates to a solid vector thruster multi-valve cooperative control method, device and system. The solid vector thruster comprises a plurality of thruster valves, the input ends of the multiple thruster valves share a gas generator channel, and output thrust of the multiple thruster valves is used for achieving aircraft attitude control. The control method comprises the following steps: establishing a linear relation between control forces required by pitching, yawing and rolling channels and valve opening degrees of thruster valves corresponding to the channels, and enabling the sum of the valve opening degrees of the plurality of thruster valves to be a fixed value during working; and the output thrust of the corresponding thruster valve is controlled according to the valve opening degree. The multi-valve synergistic effect is achieved while it is guaranteed that the pressure intensity of the system is stable, and vector thrust is continuously adjustable.

The invention provides a TBM operation parameter optimization method and system suitable for various rock mass conditions. The method comprises the steps of obtaining rock mass parameters and TBM tunneling data corresponding to the rock mass parameters are obtained; building a first change rule by taking the compressive strength and the penetration of the rock mass as input and the thrust of the cutter head as output; building a second change rule by taking the compressive strength and penetration of the rock mass as input and the torque of the cutterhead as output; taking the rock mass parameters and the operation parameters as inputs, taking the corresponding performance parameters as outputs, taking the first change rule and the second change rule as constraint conditions, and establishing a dual-drive mapping relation between the input data and the output data; establishing a TBM operation parameter optimization model by taking construction cost including tunneling speed and hob service life as a comprehensive optimization target and taking thrust, torque and belt conveyor conveying capacity as multivariate constraint indexes; using the TBM operation parameter optimization model for calculating operation parameters under the known rock mass condition when all the constraint indexes are within the rated range and the construction cost is minimum.

The invention discloses an active-passive combined upper limb power-assisting robot, and belongs to the technical field of robots. The active-passive combined upper limb power-assisting robot comprises a waist mechanism, a back mechanism and shoulder mechanisms, and the waist mechanism and the back mechanism are located on the back waist and the back of a human body respectively; the robot further comprises the shoulder mechanisms and passive power-assisting mechanisms; the lower ends of the shoulder mechanisms are connected with the back mechanism, the upper ends of the shoulder mechanisms are located above the back mechanism, and shoulder joints are assisted in abduction/constriction, inward rotation/outward rotation and forward flexion/backward extension movement through driving force; the lower ends of the passive power-assisting mechanisms are connected with the back mechanism, the upper ends of the passive power-assisting mechanisms are connected with the shoulder mechanisms, and the passive power-assisting mechanisms are used for providing multi-directional boosting force and supporting force for a user and the shoulder mechanisms; and the shoulder mechanisms have six degrees of freedom, not only provide supporting force for the shoulders, but also provide assistance in three degrees of freedom directions of abduction/convergence, inward rotation/outward rotation and forward flexion/backward extension of the shoulder joints by utilizing the passive power-assisting mechanisms and torsion springs, and effectively provide multidirectional assistance for a human body to carry and lift goods.

According to the rocket vertical landing guidance method considering the discontinuous instant adjustable engine thrust, the thrust instruction considering the engine thrust characteristic limitation can be planned in real time, and model prediction control of the landing point, the landing angle and the landing speed of a rocket body can be accurately controlled. The invention provides a rocket vertical landing guidance algorithm considering discontinuous and instant adjustment of engine thrust, a decoupling control strategy of tangential speed control and normal drop point and drop angle control is established, and an engine thrust instruction which is designed by utilizing an impulse conservation principle and meets actual thrust adjustment limitation is provided. According to the method, introduction of multiple complex and difficult-to-process nonlinear constraints is effectively avoided, the efficiency, convergence and reliability of convex optimization solution are improved, the guidance precision and robustness are remarkably enhanced, and higher engineering applicability is achieved.

The invention discloses a wearable carrying power-assisted exoskeleton, and belongs to the field of material carrying and logistics support. The wearable carrying power-assisted exoskeleton comprises a waist and back mechanism, a shoulder mechanism, a hip crossing mechanism, a thigh mechanism, a knee joint mechanism, a shank mechanism, an ankle mechanism and a foot plate; the lower end of the shoulder mechanism is connected with the back mechanism, and the upper end of the shoulder mechanism is located above the back mechanism; and the shoulder joint is assisted by driving force to do outward extension/inward contraction, inward rotation/outward rotation and forward bending/backward stretching motion. The hip crossing mechanism, the thigh mechanism, the knee joint mechanism, the shank mechanism, the ankle mechanism and the foot plate correspond to the hip, the thigh, the knee joint, the shank, the ankle and the foot of the human body from top to bottom. The extremely high supporting capacity is provided through a mechanical structure; multi-freedom-degree motion assistance of the upper limbs is provided through a servo motor and a spring; and the wearable carrying power-assisted exoskeleton is light, flexible and easy to dismount and mount.

The invention discloses a wide velocity domain variable geometry air inlet. The start mach number of a hypersonic velocity air inlet is greatly lowered through a rotary hypersonic velocity air inlet lip and a third-stage top plate. A good traffic capture capacity can be guaranteed when the mach number of the hypersonic velocity air inlet is small, and in other words, motor power is guaranteed.

The invention discloses a transmission device which comprises push arms, a transmission rod with the two ends fixedly connected with the push arms, installation seats rotationally connected with the transmission rod in the extending direction of the transmission rod and a force arm fixedly installed at the middle portion of the transmission rod and extending in the transverse direction of the transmission rod. In the transmission device, the force arm is pushed through a push device, then the force arm drives the transmission rod to rotate according to a preset direction, and rotation of the transmission rod can drive the push arms to rotate so that the two relatively-far positions can be effectively pushed through driving of one drive mechanism. Meanwhile, through the arrangement of the force arm, the thrust of the push arms can be improved, so that it is guaranteed that the thrust of the push arms meets the requirement, and therefore the transmission device can effectively solve the problem that it is difficult to simultaneously push rotary arms at the two ends of an axle.