46results about How to "Avoid mutual coupling" patented technology

The invention discloses an error detection device and a control method for laser communication link beams, belongs to the field of optical image processing, and solves the problems that single charge coupled device (CCD) is adopted to perform error detection, the control beams reduce the whole working bandwidth of the system, satellite platform high-frequency vibration cannot be effectively compensated, coarse sighting and fine sighting are easily coupled and the control stability is lower. Coarse sighting instruction output ends of an array CCD detector and a control module thereof are connected with an input end of a coarse sighting module; an output end of the coarse sighting module is connected with an input end of a coarse sighting executing mechanism; an output end of the coarse sighting executing mechanism is connected with beam coarse sighting correction input ends of the array CCD detector and the control module thereof; the fine sighting instruction output ends of the array CCD detector and the control module thereof are connected with an input end of a fine sighting module; an output end of the fine sighting module is connected with an input end of a fine sighting executing mechanism; and an output end of the fine sighting executing mechanism is connected with the beam fine sighting correction input ends of the array CCD detector and the control module thereof.

The invention discloses a four-degree-of-freedom piezoelectric micro-clamp. The four-degree-of-freedom piezoelectric micro-clamp has the following advantages: the piezoelectric micro-clamp can enable each clamp finger to realize actions in a clamping direction and a direction perpendicular to the clamping direction, that is, each clamp finger has degrees of freedom in two directions; and the whole piezoelectric micro-clamp has four degrees of freedom, so that part front end execution mechanisms of micro-assembly and micro-operation systems can be saved, the design difficulty and complexity of the system are reduced, the mass and the volume of the system are decreased, and the system cost is reduced.

The invention provides a vibration-isolation platform based on height / horizontal attitude six-dimensional position detection and control and belongs to large scale integrated circuit manufacture equipment. A vibration-isolation platform body of the device is supported by four vibration isolators which are uniformly distributed below the vibration-isolation platform body, and an X-direction displacement sensor, a Z-direction displacement sensor, a Y-direction displacement sensor, an X-direction actuator, a Z-direction actuator and a Y-direction actuator are arranged between the vibration-isolation platform body and the ground, so as to form a six-degree-of-freedom position closed-loop motion servo system. According to the invention, the height / horizontal attitude six-dimensional positions can be measured at the same time and calculated by decoupling resolution, and the calculation result is fed to a control system, so as to effectively eliminate the position error sources of the vibration-isolation platform due to inter-coupling between the six degrees of freedom and greatly improve the horizontal attitude precision and vibration isolation property of flotation vibration-isolation platforms.

The invention discloses a photonic crystal fiber producing multiple orbital angular momentum modes. The photonic crystal fiber comprises fiber core layers and annular claddings which are successivelyarranged from the center of a circle to the outside world. The fiber core layers are circular air holes, and the annular claddings are four layers and are concentric circles, and comprise a cladding 1, a cladding 2, a cladding 3 and a cladding 4 from the center of the circle to the outside world. The cladding 1 and the cladding 2 are formed by rectangular air holes. The cladding 3 and the cladding4 are formed by circular air holes. The photonic crystal fiber is used to generate a vortex light beam so as to produce a plurality of OAM modes, mutual coupling and degeneracy between vector eigenmodes in the photonic crystal fiber are avoided, and a transmission characteristic of vortex light is effectively controlled. An existing fiber supports the OAM modes and a transmission number is small.By using the photonic crystal fiber of the invention, the above problems are solved.

The invention discloses a parameter integrated design method for a five-degree-of-freedom hybrid robot. The parameter integrated design method comprises the following steps of: taking a working space midpoint as a reference point, taking kinematics performances as constraint conditions, and taking maximum working space volume as a target to determine scale parameters of a mechanism; taking static rigidity performances as constraints, and taking elastic kinematics performances as an optimization target to determine key structural parameters of a part; and determining parameters of a servo motor based on drive joint equivalent rotational inertia, rotation speed and rotation torque during motion along typical track. According to the parameter integrated design method disclosed by the invention, kinematics, statics and dynamics performances of the robot are comprehensively taken into consideration with the adoption of a hierarchical idea, so that integrated design of scale, structure and drive parameters can be realized. Kinematics, statics and dynamics performances, on any configuration, of the robot are mainly related to motion / force transmissibility of the mechanism, and therefore, parameters can be designed on a working space center to ensure global performances of the robot, and design workload can be greatly saved.

The invention provides a method for finding feasible prestress of a cable-pole structure. The method comprises the steps that an analysis model including a load F, a prestress initial value P*, a calculation error epsilon n and a displacement calculation error epsilon d is established, a Newton iterative formula is established according to a fuzzy expression between the input value P of the prestress and the output value N of unit internal force and is used for iterative calculation on the prestress P until the error requirement is met; whether the feasible prestress of the cable-pole structure is found out or not and whether reasonable updating needs to be conducted on structure geometry are judged according to the structure self-stress modal number, the internal force of a cable and a pole and the displacement of the structure, during geometry updating, the structure deformation under the prestress P and the load F is directly stacked to an original geometry to be conducted, and the prestress iteration and geometry updating are circularly conducted until all index requirements are met. According to the method, in the process of finding the feasible prestress of the cable-pole structure, reasonable geometry updating can be conducted, and the load possibility of the structure can be taken into consideration.

The invention relates to a digital correlator testing system and method, and belongs to the space microwave remote sensing technical field; the system and method firstly shunt, amplify, filter and phase shift a high frequency signal source, then carry out signal down conversion to needed intermediate frequency, and finally amplify and output in a combined path; the output signal frequency and thesignal source frequency are different, and segmented amplification is employed, thus effectively preventing inter-channel crosstalk and amplifier self excitation conditions, and greatly improving theoutput signal stability. The noise signal phase shift operations of the method are carried out in the high frequency band, thus reducing the signal bandwidth frequency ratio (B / f<<0.05), effectively eliminating the correlation noise signal decorrelation effect, and greatly improving the output signal correlation precision; the method is suitable for all digital correlator tests.

The invention provides a grafting reaction method and device. The method specifically comprises the steps of (1) premixing, wherein polyethylene, an initiating agent, a monomer and a dispersing agent are premixed to obtain a premixed material; (2) preparation of short-chain free radicals, wherein polyolefin is extruded through twin screw extruders at high temperature and high pressure to obtain the short-chain free radicals; (3) lateral feeding, wherein the premixed material obtained in the step (1) is fed into the feeding ends of the two screw extruders, the short-chain free radicals obtained in the step (2) are laterally fed into the middle rear sections of the two screw extruders, and a graft polymer is obtained by means of extrusion. The device comprises the first screw extruder, the second screw extruder, a first weightless feeding device and a second weightless feeding device. According to the method, through coupling of the laterally fed short-chain free radicals and main-chain free radicals obtained after a polyethylene grafting reaction, macromolecular cross-linking by-products are reduced; micromolecular free radicals and a polyethylene grafting system are good in compatibility and uniform in dispersity; fisheye defects of the graft polymer are effectively reduced.

The invention provides a heating device, a reaction cavity, and plasma processing equipment. The heating device comprises a plurality of separated sub-coils, an on-off switch, and an alternating current (AC) power supply. The plurality of sub-coils are arranged in different areas of the surface of a workpiece to be processed. The on-off switch is used to selectively connect one of the plurality of the sub-coils to the AC power supply, or selectively connect at least two of the plurality of the sub-coils in series to form a multi-turn coil and connect the multi-turn coil to the AC power supply electrically. The AC power supply is used to supply alternating current to the sub-coil, which is electrically connected to the AC power supply so that the sub-coil or multi-turn coil can heat the corresponding areas on the surface of the workpiece in an induction heating mode. The provided heating device can uniformly heat a workpiece through an induction heating mode, and thus the technological uniformity is improved.

The present invention relates to an integrated Doherty type amplifier arrangement and an amplifying method for such an arrangement, wherein a lumped element hybrid power divider (12) is provided for splitting input signals of main and peak amplifier stages (20, 30, 40) at predetermined phase shifts and non-equal division rates and at least one wideband lumped element artificial line (Z1, Z2) combined with wideband compensation circuit for receiving said first amplified signal and for applying said predetermined phase shift to said first amplified signal and its higher harmonics. Thereby, the low gain of the peak amplifier is compensated by providing the non-equal power splitting at the input. Moreover, the use of the lumped element hybrid power divider leads to an improved isolation between the input ports of the main and peak amplifiers decreasing final distortions of the output signal.

The invention discloses an MIM (metal-insulation-metal) capacitor which comprises a substrate, a metal shielding layer, a first metal layer, a first isolation layer, an insulation medium layer and a second metal layer, wherein the metal shielding layer is formed on the surface of the substrate; the first metal layer is formed on the metal shielding layer; the first isolation layer is formed by surrounding the first metal layer; the insulation medium layer is formed on the first metal layer; the second metal layer is formed on the insulation medium layer; and the second metal layer is connected with the isolation medium layer through a contact hole. Through the capacitor provided by the invention, the mutual influence between unit capacitors less is extremely small and the parasitic capacitance is reduced fully, thus the influence of the parasitic capacitance on ADC (analog to digital converter) performance is reduced.

The invention discloses a detection system and method for a resonant optical gyro based on pulsed light detection. According to the invention, phase modulation is carried out on continuous light outputted by a laser; a pulse light modulator driven by two pulse signals in opposite phases is used to convert the continuous light into pulsed light and then input the pulsed light into an optical annular resonant cavity; and clockwise and counterclockwise output signals of the resonant cavity are synchronously demodulated, wherein one demodulated output passes through a servo loop to stabilize the laser frequency, and the other demodulated output is used as a rotation signal of the gyro. According to the invention, a pulsed beam is used to separate clockwise and counterclockwise beams in the annular resonant cavity in time, so as to avoid energy coupling between signal light and backscattered light; backscattered noise is eliminated; the signal-to-noise ratio of an output signal is improved;and at the same time the reciprocity of the system is improved.

The invention discloses a redundant direct-current power supply system. The system is characterized in that an anode of a first power output end is connected with the anode of a first diode to form afirst power subsystem; the anode of a second power output end is connected with the anode of a second diode to form a second power subsystem; cathodes of two diodes are connected so as to be served asthe anode of the output end of a redundant direct-current power supply system; and the cathode of the first power output end is connected with the cathode of the second power output end so as to be served as an output end cathode of the redundant direct-current power supply system. Two power supply control subsystems are a main power supply control subsystem and a standby power supply control subsystem so as to guarantee an uninterrupted power supply state of the system, reliability of the system is improved, and simultaneously, a mutual coupling phenomenon caused by direct parallel connection of the two power supplies is avoided, and then damages of components are prevented.

The invention discloses a microwave differential sensor based on a substrate integrated waveguide reentrant resonant cavity and a microfluidic technology. The microwave differential sensor comprises two resonant cavities and a microfluidic chip, and each of the two cavities consists of an upper-layer cover plate and a lower-layer bottom plate which are overlapped. The middle dielectric layers of the upper layer cover plate and the lower layer bottom plate respectively comprise a plurality of metal through holes which are connected with the top layer metal layer and the bottom layer metal layer, and the bottom layer metal of the second layer plate and the top layer metal of the third layer plate are etched with feeder lines with gradually changing appearances. An annular groove is formed in each cavity, and a capacitance column is formed in the middle of each cavity and corresponds to a chip micro-channel. And the two cavities are respectively used as a sensing resonant cavity and a reference resonant cavity. According to the sensor, two reentrant resonators are ingeniously and longitudinally combined, a metal wall naturally existing between resonant cavities and a special excitation mode are utilized, and the advantages that the electric fields of the resonant cavities are highly concentrated and the micro-fluidic chip can accurately control trace fluid are combined, the microwave differential sensor which is compact in structure, is not interfered by factors such as temperature and humidity, has mutually independent components, and can be used for liquid dielectric characterization is formed.

The invention discloses a secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity. The secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity comprises a first polarization-maintaining fiber coupler, a first 90-degree rotary welding point, a third tail fiber, a second polarizer, a fourth tail fiber and a second 90-degree rotary welding point, wherein the first polarization-maintaining fiber coupler comprises a first tail fiber, a second tail fiber, the third tail fiber and the fourth tail fiber; and an optical fiber ring is combined by a first tail fiber, the first 90-degree rotary welding point, the third tail fiber, the second polarizer, the fourth tail fiber, a second 90-degree rotary welding point and the second tail fiber. The secondary 90-degree rotatably-welded polarizing optical fiber resonant cavity disclosed by the invention compensates double refraction of the resonant cavity, inhibits the resonance in one intrinsic polarization state, avoids the mutual coupling between the intrinsic polarization states, improves the temperature stability of a resonant type fiber-optic gyroscope in a full temperature range, and has important scientific meanings and application values.

The invention belongs to the technical field of flow measurement, and particularly relates to a multiphase flow fluid measuring system. An existing oil-gas-water three-phase flowmeter has certain harm to the environment and the human body, and the later cost is high. The multiphase flow fluid measuring system comprises a flowmeter module, a water content module and a data collecting and processing module, wherein the flowmeter module is connected with the water content module, the flowmeter module is connected with the data collecting and processing module, and the water content module is connected with the data collecting and processing module; the flowmeter module is used for measuring the virtual high flow of fluid; the water content module is used for measuring the phase content of water; and the data collecting and processing module is used for collecting data and then calculating the flow of each phase. A sensor is subjected to modular design, the position of the sensor can be conveniently adjusted according to different metering requirements, and rapid, stable and reliable metering detection results can be provided for oil and gas wells under different working conditions.

The invention provides a flow cooperative control method and a control system device for shift gas and non-shift gas of a gasification furnace. When an unconverted gas flow regulating valve position is in an effective control interval, a converted gas regulating valve controls the unconverted gas flow regulating valve position through integration, so that the unconverted gas flow regulating valveposition is in the intermediate value of the effective control interval; and when the unconverted gas flow regulating valve position is out of the effective control interval, the converted gas regulating valve controls the unconverted gas flow regulating valve position through proportional integral differential, so that the unconverted gas flow regulating valve position returns to the effective control interval. According to the invention, different control strategies are used according to different intervals where the unconverted gas flow regulating valve positions are located, the coupling between two flows is overcome, the converted gas flow and the unconverted gas flow can be rapidly and stably adjusted according to load changes, fluctuation of downstream devices due to untimely flow adjustment is avoided, and meanwhile the operation amount of device personnel is reduced.

The invention discloses a three-dimensional friction pendulum shock insulation support with a tensile function, and relates to the technical field of friction pendulum shock insulation supports, the three-dimensional friction pendulum shock insulation support comprises an upper support plate, an upper sliding part, a vertical shock insulation unit, a lower sliding part and a lower support plate, the upper sliding part is arranged at the lower end of the upper support plate, the vertical shock insulation unit is arranged at the lower end of the upper sliding part, and the vertical shock insulation unit is arranged at the lower end of the lower sliding part. A lower sliding part is arranged at the lower end of the vertical seismic isolation unit, a lower support plate is arranged at the lower end of the lower sliding part, and the upper support plate directly faces the lower support plate; a first mounting hole is formed in the first support body, a first gap is formed between an upward-protruding arc arranged on the inner wall of the upper side of the first groove and the first arc-shaped face, and an upper sliding part is arranged in the first gap in a sliding mode. The anti-drawing performance is ensured; mutual coupling of the horizontal mechanical property and the vertical mechanical property of the support is avoided; a torsion effect can be provided under the tension and compression conditions of the support; the support can horizontally isolate shock and can also vertically isolate shock, namely, the support can achieve three-dimensional shock isolation.

The invention discloses a non-magnetic sensor which comprises a scanning module, a plurality of LC oscillating circuits and a plastic disc. The LC oscillating circuits are electrically connected withthe scanning module, the plastic disc is mounted at the upper end of an impeller, sheet metal covers a part of the upper surface of the plastic disc, inductors of the LC oscillating circuits directlyface the plastic disc and are arranged above the plastic disc, and the various LC oscillating circuits have unequal resonant angular frequencies. The non-magnetic sensor has the advantages that the various LC oscillating circuits are free of interference on one another in limited spaces, the non-magnetic sensor has non-magnetic sensing functions, and the measurement accuracy can be improved.

The invention relates to a digital correlator testing system and method, and belongs to the space microwave remote sensing technical field; the system and method firstly shunt, amplify, filter and phase shift a high frequency signal source, then carry out signal down conversion to needed intermediate frequency, and finally amplify and output in a combined path; the output signal frequency and thesignal source frequency are different, and segmented amplification is employed, thus effectively preventing inter-channel crosstalk and amplifier self excitation conditions, and greatly improving theoutput signal stability. The noise signal phase shift operations of the method are carried out in the high frequency band, thus reducing the signal bandwidth frequency ratio (B / f<<0.05), effectively eliminating the correlation noise signal decorrelation effect, and greatly improving the output signal correlation precision; the method is suitable for all digital correlator tests.

The invention discloses a manufacturing process for a four-degree-of-freedom piezoelectric micro-gripper. The manufacturing method has the advantages that piezoelectric wafers and electrodes on the surfaces of the piezoelectric wafers of the four-degree-of-freedom piezoelectric micro-gripper manufactured through the method have high shape and dimensional accuracy, high relative position accuracy is achieved between the upper wafer and the lower wafer and the electrodes of the upper wafer and the lower wafer, and therefore the four-degree-of-freedom piezoelectric micro-gripper has the good output characteristics such as good output displacement and output force repeatability, high response speed and high inherent frequency; due to the fact that each gripper finger of the manufactured four-degree-of-freedom piezoelectric micro-gripper can move in the clamping direction and the direction perpendicular to the clamping direction, in other words, each gripper finger has degrees of freedom in two directions, and the whole piezoelectric micro-gripper has four degrees of freedom; thus, part of front-end executing mechanisms of a micro-assembly and micro-operation system can be omitted, the design difficulty and complexity of the system are lowered, the mass and size of the system are reduced, and the cost of the system is also reduced.

The invention discloses a photonic crystal fiber producing multiple orbital angular momentum modes. The photonic crystal fiber comprises fiber core layers and annular claddings which are successivelyarranged from the center of a circle to the outside world. The fiber core layers are circular air holes, and the annular claddings are four layers and are concentric circles, and comprise a cladding 1, a cladding 2, a cladding 3 and a cladding 4 from the center of the circle to the outside world. The cladding 1 and the cladding 2 are formed by rectangular air holes. The cladding 3 and the cladding4 are formed by circular air holes. The photonic crystal fiber is used to generate a vortex light beam so as to produce a plurality of OAM modes, mutual coupling and degeneracy between vector eigenmodes in the photonic crystal fiber are avoided, and a transmission characteristic of vortex light is effectively controlled. An existing fiber supports the OAM modes and a transmission number is small.By using the photonic crystal fiber of the invention, the above problems are solved.

The invention discloses an equalizing device for air spring height valves of medium-low speed maglev vehicles. The device comprises a height valve, a mounting plate, a torsion bar, a mounting suspender, a displacement transmission rod, an adjusting rod and a connecting rod, wherein the height valve is connected with the displacement transmission rod through the adjusting rod; one end of the displacement transmission rod is connected with a right mounting plate, and the other end is connected with the torsion bar; the torsion bar is connected with a left mounting plate; one end of the mountingsuspender is connected with a maglev vehicle body, and the other end is connected with the torsion bar. Displacement of modules is transmitted to the height valve through the adjusting rod connected to the displacement transmission rod to form a four-point height control system; since the front height valve transmits balanced displacement of the two modules, the relative displacement condition between a suspension frame and the vehicle body can be more accurately reflected, so that decoupling of the suspension frame and the secondary system formed by air springs are prevented from forming mutual coupling, and the condition that the vehicle body cannot suspend normally caused by pressing modules of the vehicle body in a bend due to excessive inflation or deflation of the air secondary suspension system is also prevented.

The invention discloses an aero-engine assembly measuring system two-dimensional driving device based on plane orthogonal decoupling and belongs to the technical field of precision instruments and machinery. A tray is arranged between a base and a table top. A Y-direction guide block B fixedly connected to the tray is matched with a guide groove b1 in the tray in a contact mode, and a Y-direction guide block A is matched with a guide groove b2 in the tray in a contact mode to guide the tray to move along the Y-axis. A Y-direction motor drives the tray to move forwards along the Y-axis, and a Y-direction spring is compressed to provide restoring force for reverse movement of the tray along the Y-axis. An X-direction guide block A fixedly connected to the table top is matched with a guide groove b3 in the tray in a contact mode, and an X-direction guide block B is matched with a guide groove b4 in the tray in a contact mode to guide the tray to move along the X-axis. An X-direction motor drives the table top to move reversely along the X-axis, and an X-direction spring is compressed to provide restoring force for forward movement of the table top along the X-axis. By means of the aero-engine assembly measuring system two-dimensional driving device, the moving and positioning accuracy of an aero-engine assembly measuring system is improved, and the assembly accuracy and measurement efficiency of an engine are improved.

The application belongs to the technical field of flow measurement, and in particular relates to a multiphase flow fluid measurement system based on standpipe differential pressure. The existing oil-gas-water three-phase flowmeter is harmful to the environment and the human body, and the subsequent cost is relatively high. The application provides a multiphase flow fluid measurement system based on standpipe differential pressure, including a flowmeter module, a density meter module and a data acquisition and processing module, the flowmeter module is connected to the density meter module, and the flowmeter The module performs data communication with the data acquisition and processing module, and the density meter module performs data communication with the data acquisition and processing module; the flow meter module is used to measure the virtual high flow rate of the fluid; the density meter module uses It is used to measure the mixing density and volumetric liquid content of the fluid; the data acquisition and processing module is used to calculate the flow rate of each phase after collecting the data. The mutual coupling between errors is avoided, and the detection accuracy is improved.

The invention relates to a magnetic levitation pump with a three-degree-of-freedom magnetic bearing, which includes a three-degree-of-freedom magnetic bearing and a rotating drive assembly. The three-degree-of-freedom magnetic bearing plays a role in suspending and positioning a rotor and an impeller, and the rotating drive assembly has an outer rotor structure; It is mainly used to solve the unstable phenomenon of the rotor in the axial direction when the two-degree-of-freedom bearingless motor is applied to the pump. Moreover, the coupling problem existing between the suspension winding flux linkage and the driving winding flux linkage is improved, and the difficulty of motor control is reduced. The structure is compact, which is convenient for high cleanliness occasions; the magnetic linkage between the rotating drive winding and the suspension winding is not coupled, which is convenient for control.

The invention discloses a parameter integrated design method for a five-degree-of-freedom hybrid robot. The parameter integrated design method comprises the following steps of: taking a working space midpoint as a reference point, taking kinematics performances as constraint conditions, and taking maximum working space volume as a target to determine scale parameters of a mechanism; taking static rigidity performances as constraints, and taking elastic kinematics performances as an optimization target to determine key structural parameters of a part; and determining parameters of a servo motor based on drive joint equivalent rotational inertia, rotation speed and rotation torque during motion along typical track. According to the parameter integrated design method disclosed by the invention, kinematics, statics and dynamics performances of the robot are comprehensively taken into consideration with the adoption of a hierarchical idea, so that integrated design of scale, structure and drive parameters can be realized. Kinematics, statics and dynamics performances, on any configuration, of the robot are mainly related to motion / force transmissibility of the mechanism, and therefore, parameters can be designed on a working space center to ensure global performances of the robot, and design workload can be greatly saved.

The invention discloses a four-degree-of-freedom piezoelectric micro-clamp. The four-degree-of-freedom piezoelectric micro-clamp has the following advantages: the piezoelectric micro-clamp can enable each clamp finger to realize actions in a clamping direction and a direction perpendicular to the clamping direction, that is, each clamp finger has degrees of freedom in two directions; and the whole piezoelectric micro-clamp has four degrees of freedom, so that part front end execution mechanisms of micro-assembly and micro-operation systems can be saved, the design difficulty and complexity of the system are reduced, the mass and the volume of the system are decreased, and the system cost is reduced.