68results about How to "Reduce size and mass" patented technology

The invention discloses an airborne laser radar pitch angle deviation real-time compensation method and an airborne laser radar pitch angle deviation real-time compensation device. The device comprises a laser scanner device capable of realizing pitch angle deviation compensation, a pitch angle compensation controller and driving device, a GPS/INS combined measurement device, wherein the laser scanner device capable of realizing the pitch angle deviation compensation comprises a laser scanning transmitting and receiving system, a scanning prism, a compensation mirror, a photoelectric axial angle encoder and a compensation mirror motor; the GPS/INS combined measurement device acquires the attitude angle (pitch angle, rolling angle and yaw angle) deviation of a airborne platform and provides the acquired attitude angle deviation to the pitch angle compensation controller and driving device; and the pitch angle compensation controller and driving device controls the motor of the compensation mirror by using a compensation signal, receives a feedback signal from the compensation mirror photoelectric angle encoder, completes the closed-loop control of the pitch angle deviation compensation mirror and realizes the real-time high-accuracy compensation of the pitch angle deviation of an airborne laser radar.

The invention relates to a reconfigurable mechanical arm guaranteed cost decentralized control method based on self-adaption dynamic programming, and belongs to the field of robot control systems andcontrol algorithms. In order to the solve the problems that according to a traditional reconfigurable mechanical arm control method, joint coupling crosslinking items disturb system integral control,energy consumption is generated in the reconfiguration and control process of reconfigurable mechanical arms, and the uncertainty permissible range exists in the motor actual working process, the method constructs a kinetic model of a reconfigurable mechanical arm subsystem, coupling crosslinking items of all joints are singly shown through a reconfigurable mechanical arm inertia item, a coriolisforce and centrifugal force item and a gravity item, and a performance index function and an HJB equation are constructed; the HJB equation is solved through a method based on ADP policy iteration, coupling crosslinking uncertainty items among the joints are compensated through a neural network, and finally the validity of the algorithm is verified through numerical simulation of different-configuration two-freedom-degree mechanical arms; and high-accuracy control over the reconfigurable mechanical arms is achieved.

The invention discloses a light high-accuracy digital control system for a miniature flywheel. The system belongs to a kind of posture control execution mechanism applied to miniature satellites which are lighter than 100Kg, and mainly comprises a field programmable gate array (FPGA) module, a three-phase full-bridge driving device, an RS-232 communication circuit, a Buck converter, an analogue-to-digital (AD) sampling circuit and a signal conditioning circuit, a Hall signal filter and the like, wherein the FPGA module comprises an instruction parser, a moment-current converter, a single-neuron adaptive proportion integration differentiation (PID) controller, a pulse width modulator (PWM), a commutation logic signal generator and the like. By the invention, a nonlinear transformation online correction method is adopted; the digital control system for the miniature flywheel is formed by taking the FPGA module as a control core based on a single-neuron adaptive PID control algorithm; and the high-accuracy moment output of the posture control execution mechanism for the miniature satellite is realized by adopting a moment mode. The invention has the characteristics that: the algorithm is simple and easy to implement; the system is quick in response, low in power consumption, high in reliability, flexible in design and particularly suitable for the miniature satellite; the power density of the miniature flywheel is increased; the mass and volume of the miniature flywheel are decreased; and cost is decreased.

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.

A wind turbine has an impeller surrounded by a shroud. The shroud is formed from inflatable components extending between two rigid structural members. When inflated, the shroud acts to increase the energy generated by the impeller. Under adverse wind conditions, the inflatable components can be deflated to reduce surface area and wind load on the turbine.

A wind turbine comprises a turbine shroud and optionally an ejector shroud. The turbine shroud and/or the ejector shroud include a skeleton support structure, with a skin covering at least a portion of the turbine shroud and/or ejector shroud skeleton. In other embodiments, leading and trailing edges of the turbine shroud and/or ejector shroud are made of a rigid material and are not covered by the skin of the shroud.

A composite positive electrode of a lithium sulfur battery is formed by combining a diaphragm layer, a porous carbon layer and a carbon sulfur compound, wherein the porous carbon layer is arranged on one side of the diaphragm layer, and the carbon sulfur compound is arranged on the porous carbon layer. The preparation method comprises the following steps of adding the porous carbon, a conductive agent and an adhesive into an organic solvent to prepare paste, applying the paste onto one side of a diaphragm, and forming a porous carbon layer compound on one surface of the diaphragm layer; and adding the carbon sulfur compound, the conductive agent and the adhesive into the organic solvent to prepare paste, and applying the paste onto the porous carbon layer in the compound to obtain the composite positive electrode of the lithium sulfur battery. The lithium sulfur battery disclosed by the invention comprises the composite positive electrode of the lithium sulfur battery, a negative electrode and an electrolyte. By the lithium sulfur battery, the interface resistance can be reduced, the ionic conductivity and electron conductivity are improved, and the energy density, the cycle performance and the rate performance of the lithium sulfur battery are effectively improved.

The invention discloses microsatellite quality characteristic bidirectional testing equipment. A U-shaped symmetrical inner and outer supporting frame structure is adopted; an inner supporting frame is driven to rotate around a rotating shaft by a speed-reducing mechanism and is easily positioned in vertical and horizontal directions through a positioning mechanism; and the problem of rapid coordinate conversion in a vertical state and a horizontal state through one-time hoisting is solved. The quality characteristic data in two states is tested through one-time hoisting and clamping in the field of microsatellites, the quality characteristic testing time is shortened, the testing efficiency and testing effect are improved, the safety and reliability of the quality characteristic testing are enhanced, and the labor intensity of personnel is greatly lightened. The microsatellite quality characteristic bidirectional testing equipment has a simple structure, is convenient to operate, and can be used for quality characteristic testing of spacecrafts and other miniature equipment.

The invention discloses a voltage-active-clamping non-transformer-type single-phase photovoltaic inverter which comprises an energy storage voltage dividing unit, a full-bridge inverting unit, an active-clamping unit and a filtering unit. When the inverter works, seven power switches with anti-parallel diodes work in an coordinated-action mode, so that when the inverter outputs the zero level, an alternating side carries out current following, the common-mode voltage is subjected to clamping to reach 1/2 of direct-current input voltage, accordingly, the fact that the common-mode voltage is constant in the whole cycle is guaranteed, then complete removing of common-mode current is achieved, and needed bus voltage is only half of a half-bridge type circuit. Meanwhile, unipolarity pulse width modulation is used, output current ripples are small, the size and the weight of a filter are reduced, meanwhile, loss on a magnetic element is lowered, on-off action frequency is low during an on-off cycle, switch loss is lowered, accordingly, the inverter is high in output efficiency, and the inverting efficiency as high as 98% can be obtained.

An integrated engine flywheel electromagnetic liquid cooling retarder belongs to the field of automobile brake, and structurally includes a retarder rotor, a retarder stator, a rotor bracket, a startup disk, a bottom magnetic circuit, a retarder coil and a fixed disk, wherein the retarder rotor consists of salient pole rotors and a non-magnetic conductive connecting disk, and is connected with a crankshaft through the rotor bracket, the startup disk and a connecting flange; and a flywheel consists of the retarder rotor, the rotor bracket and the startup disk. According to the invention, the retarder is placed between an engine and a clutch, and has the function of the flywheel and the function of the retarder rotor after the improvement on the flywheel; and compared with an integral transmission retarder, the integrated engine flywheel electromagnetic liquid cooling retarder solves the problem of impact on a gearbox during shifting, is mounted at the rear end of the engine, enhances the brake effect of the retarder in virtue of the function of speed reduction (namely, torsion amplification) of a transmission, and is simple to control, small in size, and light, adopts the liquid cooling for heat dissipation, and is safe and reliable.

The invention relates to a treatment method of oil-containing sludge. The treatment method is especially suitable for the oil-containing sludge produced in sewage treatment processes of an oil refinery. The method includes feeding the oil-containing sludge to a greenhouse desiccation room, desiccating naturally under conditions of full sunshine, mixing mud cake with an extracting agent at room temperature, performing homogeneous extraction, feeding the material mixture to a solid-liquid centrifugal separator after the extraction is finished, and directly recycling separated liquid. Separated solid residue, after being dried, is mixed with coal and the mixture can be used as fuel for coal-fired boiler. According to the method, energy consumption for treatment of the oil-containing sludge is low, the technology process is short, the equipment investment is low and harmless treatment of the oil-containing sludge can be achieved.

The invention relates to a smooth and steady pointing maneuvering control method for a satellite optical load. The method comprises the following steps that 1, the attitude of a satellite body is stabilized; 2, a pointing mechanism of the optical load is controlled to enable pointing mechanism pointing orientation to be maneuvered to a target orientation along a set track; 3, an image stabilizing mechanism is controlled to carry out compensation on optical axis shaking, and the target orientation is stably imaged. The smooth and steady pointing maneuvering control method for the satellite optical load has the following advantages that 1, compared with the satellite body, the pointing mechanism is small in mass and size, high in maneuvering speed and little in energy consumption, and the image stabilizing mechanism is driven by a piezoelectric material, is wide in bandwidth and can effectively carry out compensation on control errors of the pointing mechanism and inhibit optical axis shaking; in addition, in the load optical axis maneuvering process, the stability is high, little pointing shaking is generated, the track is smooth, and the target orientation precision and stability are high; smooth and steady pointing maneuvering is provided for the optical load, and the imaging precision during maneuvering is guaranteed.

The invention provides a waveguide-type polarization splitter, which comprises a main waveguide pipe, a side wall waveguide coupling window on the top face of the main waveguide pipe and matrixes in the main waveguide pipe. The waveguide-type polarization splitter is characterized in that: the number of the matrixes is two or more and the matrixes are parallelly arranged in the main waveguide pipe; a tuning step positioned below the side wall waveguide coupling window is correspondingly arranged at the bottom of the main waveguide pipe; and the tuning step is a rectangular metal box body arranged at the bottom of the main waveguide pipe, and the front side face and the back side face of the metal box body are pressed against the front side face and the back side face of the main waveguide pipe. The number of the matrixes is two or more and the matrixes are parallelly arranged in the main waveguide pipe in a way of deviating from the waveguide coupling window. The metal box body of the tuning step is a box body with five sides and is buckled at the bottom of the main waveguide pipe in a way of deviating from or facing the side wall waveguide coupling window. The positions and sizes of the matrixes are determined by adopting a method of combining a finite-difference time-domain method and a genetic algorithm.

The invention relates to an anchoring device of a self-elevating drilling platform, in particular to an improved torpedo anchor. The improved torpedo anchor is characterized by comprising a torpedo anchor body, a bottom torsion spring, a bottom torsion spring outer installation frame, a reset casing pipe, a main bearing rod, a lower supporting plate, an upper supporting plate, an upper torsion spring outer installation frame, an upper torsion spring, a feeding frame, a torque transfer pipe, a tail wing shell, a spiral wing and the like. The bottom torsion spring outer installation frame is coaxially matched with the torpedo anchor body, the initial state of the bottom torsion spring outer installation frame is locked by a pin shaft on a bottom locking disc, the bottom torsion spring outer installation frame is matched with the reset casing pipe through threads, the main bearing rod is fixedly connected with the bottom locking disc and coaxially matched with a reset balancing weight, the lower supporting plate is installed on the torpedo anchor body through a connecting pin and connected with the upper supporting plate through the connecting pin, and the upper torsion spring outer installation frame is internally and fixedly connected with the upper torsion spring, and externally matched with the feeding frame through threads. Compared with an existing torpedo anchor, the mechanism is complex, the mass and size of the torpedo anchor are reduced, the anchoring effect is improved, and the torpedo anchor can be taken out more easily.

The invention discloses a building stair pedestrian volume estimation system based on a multi-dimensional MEMS inertial sensor to meet the requirement for stair safety real-time monitoring. In combination with the geometric dimension, the material engineering, the structural characteristics, the connection mode and the use condition of the staircase, proper contact acquisition points of the multi-dimensional MEMS inertial sensor are selected, the pedestrian flow load of the staircase is estimated through the multi-dimensional contact MEMS inertial sensor data monitored in real time, the safetydegree is evaluated, and early warning is carried out in time. The stair monitoring and evaluation system is composed of the following subsystems: a multi-dimensional MEMS inertial data acquisition subsystem, an infrared image calibration subsystem, a wireless data transmission subsystem, a multi-dimensional data processing subsystem and a stair vibration mode identification and load estimation subsystem. According to the method, machine learning based on a building stair structure vibration response mechanical model is carried out after certain feature processing by using a small stair vibration sample amount, and building stair pedestrian volume modeling and load estimation are carried out by using the machine learning model.

The invention discloses a drilling pump with a T-type pump head. The drilling pump with the T-type pump head is mainly formed by a shell body, a discharge liquor cylinder arranged on the shell body, a discharging pipe connected and communicated with the discharge liquor cylinder, a suction liquor cylinder connected and communicated with the discharge liquor cylinder, and a suction pipe connected and communicated with the liquid suction cylinder. A piston device communicated with the discharge liquor cylinder is arranged inside the shell body. The invention further discloses a supercharging method based on the drilling pump. The drilling pump with the T-type pump head is in a compact structure and a suction chamber is canceled, the volume and the quality of the drilling pump with the T-type pump head are both reduced by 25% - 30%. The drilling pump with the T-type pump head is easy to process and manufacture, convenience is brought to flaw detect and inspection, and can ensure the quality of pump head products. Slurry is sucked horizontally, the clearance volume in the pump head cylinder is small, the suction efficiency and the volumetric efficiency of the drilling pump are improved; liquid flow is smooth, pressure fluctuation and pressure vibration are reduced, and drilling pump impact loads are also reduced. The change of a suction valve is very convenient and time-saving, and the workload of dismounting and changing is little.

The invention provides a connecting and separating device based on memory alloy wire driving, which comprises a driving end and a driven end, wherein the driving end comprises a shell, an outer sleeve, a fixed sheet, a compression spring, a rotary sleeve, a base, a memory alloy wire, a guide wheel, a lock pin, a limiting sleeve I and a limiting sleeve II, and the driven end comprises a screw rod,a loading nut, a separating piece and an adapter piece; the upper end of the screw rod is a threaded section matched with the loading nut, and the lower end of the screw rod is provided with multiplelayers of inclined bulges; the multiple layers of inclined bulges extend into the upper part of an accommodating space formed by the limiting sleeve I and the limiting sleeve II; when the memory alloywire is powered on, the memory alloy wire is shortened, the base and the lock pin move upwards, the lock pin relieves limiting of the lower ends of the limiting sleeve I and the limiting sleeve II, the two limiting sleeves rotate simultaneously, the lower portions of the limiting sleeve I and the limiting sleeve II are folded, the upper portions of the limiting sleeve I and the limiting sleeve IIare opened and separated from the screw rod, and the driving end and the driven end are separated. The device realizes rapid separation, and has the advantages of no impact, energy conservation, environmental protection, small size, high reliability and reusability.

The invention discloses an adjusting platform. The adjusting platform comprises an upper platform and a lower platform which are arranged oppositely, at least three coarse-grade driving legs and at least three fine-grade driving legs, wherein each coarse-grade driving leg comprises a torque motor, a screw rod shaft which is fixedly connected with a rotor of the torque motor and a movable sleeve which is in thread connection with the screw rod shaft; each fine-grade driving leg comprises a linear motor, a connecting sleeve which is in relatively fixed with a stator and the linear motor and an elastic sheet which is arranged in the connecting sleeve; a first position of each elastic sheet is fixedly connected with a promoter of the corresponding linear motor; a second position of each elastic sheet is fixedly connected with the corresponding connecting sleeve. By adopting the structural design of the adjusting platform, the problems that the weight and size of the adjusting platform arerelatively large and the precision is low can be effectively solved.

The invention discloses a transformer-free type single-phase photovoltaic inverter with mixed voltage clamping. The transformer-free type single-phase photovoltaic inverter comprises an energy storagevoltage dividing unit, a power inversion unit, a mixed clamping unit and a filter unit. When the inverter works, with the help of six diodes, five power switches with antiparallel diodes are cooperated to enable an alternating current side to be continuous and clamp common-mode voltage of the same to be half of direct current input voltage when the inverter outputs zero level, and thereby complete elimination of the common-mode voltage is achieved, and required bus voltage is only half of a half-bridge type circuit. Meanwhile, the transformer-free type single-phase photovoltaic inverter adopts a unipolar pulse width modulation mode, so that output current is small in ripple, volume and weight of a filter are reduced, and loss of a magnetic element is reduced at the same time; the switch operates less frequently in a switching period, so that switching loss is reduced; and therefore, the inverter provided by the invention is high in output efficiency that inversion efficiency up to 98%can be obtained.

The invention provides a knee joint prosthesis, a hydraulic damper for an artificial limb and an energy storage acting method of the hydraulic damper for the artificial limb. The hydraulic damper forthe artificial limb comprises a hydraulic cylinder body, an energy storage device, a first one-way valve, a second one-way valve, a first control valve and a second control valve, wherein the energy storage device is installed on the hydraulic cylinder body, a first port of the energy storage device communicates with a rod chamber through a first pipeline, the first port of the energy storage device communicates with a rodless chamber through a second pipeline, the first pipeline comprises a first branch pipeline and a second branch pipeline which are arranged in parallel, and the second pipeline comprises a first branching pipeline and a second branching pipeline which are arranged in parallel; the first one-way valve is arranged on the first branching pipeline, and the second one-way valve is arranged on the first branch pipeline; and the first control valve is installed on the second branching pipeline, and the second control valve is installed on the second branch pipeline. The volume and mass of the whole damper can be reduced, the structure is simple, and thus the production cost of the hydraulic damper for the artificial limb is reduced.

The invention discloses an axial magnetic field hub motor assembly, which comprises a central shaft, a rotor assembly and a stator assembly, wherein the central shaft is arranged in a rotor frame through a bearing in a penetrating mode, and permanent magnets are installed on the rotor frame; a second stator assembly is fixedly arranged on the central shaft in a sleeving manner; a planet carrier isarranged on the central shaft in a sleeving manner; the planet carrier and the second stator assembly are located on the two sides of the rotor assembly respectively; the planet carrier and the hub bearing are integrally arranged; a planet gear is arranged on the planet carrier; a sun gear sleeves the central shaft through a bearing and is fixedly connected with the rotor frame; the central shaftpenetrates through the hub bearing and is locked with the hub bearing; the central shaft is also sleeved with a first stator assembly and a stator back plate; the first stator assembly is fixedly connected with the stator back plate; and the stator back plate sleeves a gear ring and is connected with the gear ring through a spline; the rotor assembly is connected with a speed position sensor; anda hub bearing bolt is arranged on the hub bearing. Under the condition of outputting the same torque, the mass and the size of the motor assembly are reduced, and the torque density of the motor is improved.

The invention discloses a line gear mechanism with variable angle drive. The mechanism adopts a pair of intersecting axis gears for forming a drive pair and comprises a driving wheel and a driven wheel. The driving wheel and the driven wheel are each composed of a wheel body and line teeth. The contact lines of the driving wheel line teeth and the driven wheel line teeth are engaged according to apair of space conjugate curves. The driving wheel is provided with one or more line teeth. The line teeth on the driven wheel are line teeth with the variable angle drive property. In the drive process, the drive angle of the intersecting axis gear pair can be adjusted, thus, engagement points are located on different contact lines, meanwhile, the drive ratio is kept constant, and drive is stable. The contact lines of a driving line gear and a driven line gear are different at different drive angles, the gear mechanism can have the same drive ratio through the different engagement lines, andstepless variable angle drive with a fixed drive ratio between two shafts can be achieved.

The invention discloses a multi-motor driven Y-shaped rod unilateral unfolding mechanism. A Y-shaped rod is a super-elastic rod made of a carbon fiber composite material, has a Y-shaped cross sectionand can be pressed flat, bent and wound, and automatic unfolding can be achieved through elastic potential energy stored through bending deformation; a Y-shaped rod unilateral driving mechanism is mainly composed of a roller transmission mechanism, a rocker arm transmission mechanism, a root fixing support mechanism and a supporting frame. The roller transmission mechanism is mainly used for storing and stretching the Y-shaped rod after pressing flat and winding, the rocker arm transmission mechanism is mainly used for flattening and bulging a root part of the Y-shaped rod, the root fixing support mechanism is mainly used for fixing the root part of the Y-shaped rod to enhance the rigidity of the Y-shaped rod in an unfolded state, and the supporting frame is mainly used for maintaining relative positions of various parts of a Y-shaped rod system and the stability of the entire mechanism. According to the multi-motor driven Y-shaped rod unilateral unfolding mechanism, the folding and unfolding ratio is large, the size is small, the weight is light, the unfolding speed is adjustable, the supporting frame enhances the rigidity of the Y-shaped rod during unfolding, and normal unfoldingof the Y-shaped rod is ensured.

The invention discloses an independent gas supply pneumatic system capable of providing pneumatic muscles for working, and relates to a pneumatic system. The invention aims to solve the problem that an existing pneumatic system needs a large-volume cylinder to store high-pressure gas and the pneumatic muscles are inflated and exhausted by pressure proportional valve pressure-regulating equipment, so that the pneumatic system cannot be integrated into a mobile robot by reducing a volume and a mass of the pneumatic system. According to the independent gas supply pneumatic system disclosed by the invention, a high pressure cabin and a low pressure cabin are arranged oppositely and are communicated by a gas pump; a battery is connected to the gas pump and supplies power to the gas pump; the high pressure cabin is connected with an air filtering valve and provides a gas source for a pneumatic execution unit by one switching pneumatic system; the low pressure cabin provides an exhaust space for the pneumatic execution unit by another switching pneumatic system; a high-pressure-cabin pressure sensor is used for measuring an in-cabin pressure of the high pressure cabin; a low-pressure-cabin pressure sensor is used for measuring an in-cabin pressure of the low pressure cabin. The independent gas supply pneumatic system is particularly suitable for a frog swimming simulation robot.

The invention belongs to the field of batteries, and discloses a lead-air battery. The lead-air battery comprises an insulating housing, an electrolyte, a lead electrode, an air electrode, a nickel screen and an insulating press block, wherein the lead electrode is arranged in the insulating housing; the air electrode comprises a perfluorosulfonate membrane, a catalyst layer and carbon paper; the perfluorosulfonate membrane is in contact with the electrolyte; the insulating press block presses the nickel screen and the air electrode on a sealing pad; the nickel screen is located between the carbon paper and the insulating press block; and the insulating press block is fixedly connected to the insulating housing. According to the lead-air battery, the quality and the volume of a lead-acid battery are reduced, the positive electrode overpotential is reduced, the current density is improved, the specific energy and the specific power of the lead-acid battery are improved, the stability of the lead-acid battery is strengthened, the amount of lead is reduced and the environmental influence of the lead-acid battery is reduced.

The invention discloses a pendulum type spiral scanning imaging system and method for a single small-view-field camera, relates to an imaging motion mode of a space remote sensing camera, solves the problem that an imaging mode of a traditional camera is small in imaging view field, and realizes large-view-field wide-area imaging under a small load. According to the imaging camera with the small field of view on the imaging load module, large-field-of-view imaging of the imaging camera with the small field of view is achieved through coordinated cooperation of motion and postures of the spatial remote sensing platform, the mechanical rotating module and the swinging device on the imaging load module. Compared with an existing imaging system, the mass and the size of the single imaging loadmodule are very small, and the size and the mass of the remote sensing platform are also smaller than those of the existing remote sensing platform. The contradiction of quality, volume, resolution and breadth of an imaging system of an existing space remote sensing platform and the bottleneck problem of an existing small-field-of-view camera in large-field-of-view imaging application are solved.In the wide-area search, the manufacturing process of the large-view-field camera is complex and difficult, and the structure and manufacturing of the imaging load system are very simple.