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36results about How to "Increased stability range" patented technology
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Five-level feed-back digital-to-analog converter for a switched capacitor sigma-delta analog-to-digital converter
ActiveUS7102558B2Improve performanceLow-power consumption of a switched capacitorElectric signal transmission systemsAnalogue conversionVoltage referenceGreek letter sigma
A five-level feed-back digital-to-analog converter (DAC) in a switched capacitor sigma-delta analog-to-digital converter has an improved switching sequence that boosts from two to five the number of quantization levels of the feed-back DAC. Switching sequences are used to obtain five equally distributed charge levels C*VREF, C*VREF / 2, 0, −C*VREF / 2 and −C*VREF. When summed with an input voltage, VIN, the five-level feed-back DAC produces five equally distributed output voltages of A*VIN+VREF, A*VIN+VREF / 2, A*VIN+0, A*VIN−VREF / 2 and A*VIN−VREF, where A is gain, VIN is the input voltage, and VREF is the reference voltage.
Owner:MICROCHIP TECH INC
Stator field providing torque and levitation
InactiveUS6879074B2Easy constructionSimple electrical controlShaftsMechanical energy handlingMagnetomotive forceLevitation
The invention relates to an economical, non-wearing, electrical permanent magnet drive for actively controlling the rotor position in three degree of freedom. The stator windings produce superimposed fields with different pole numbers in the pole pitches by unsymmetrical magnetomotive force distributions.
Owner:LEVITRONIX TECH +1
Premix Burner With Mixing Section
InactiveUS20070259296A1Optimize flowLow emissionCombustion using gaseous and pulverulent fuelContinuous combustion chamberEngineeringMutually Defined
A premix burner has a mixing section (3) for a heat generator, sectional conical shells (5) which complement one another to form a swirl body, enclose a conically widening swirl space (6), and mutually define tangential air-inlet slots (7), along which feeds (8) for gaseous fuel are provided in a distributed manner, having at least one fuel feed (11) for liquid fuel, this fuel feed (11) being arranged along a burner axis (A) passing centrally through the swirl space (6), and having a mixing tube (4) adjoining the swirl body downstream via a transition piece (2). At least one additional fuel feed (13) for liquid fuel is provided in the region of the swirl body, the transition piece (2), and / or the mixing tube (4).
Owner:ANSALDO ENERGIA SWITZERLAND AG
Premix burner with mixing section
InactiveUS8057224B2Minimize and completely eliminate increasing riskOutput maximizationCombustion using gaseous and pulverulent fuelContinuous combustion chamberCombustorEngineering
A premix burner has a mixing section (3) for a heat generator, sectional conical shells (5) which complement one another to form a swirl body, enclose a conically widening swirl space (6), and mutually define tangential air-inlet slots (7), along which feeds (8) for gaseous fuel are provided in a distributed manner, having at least one fuel feed (11) for liquid fuel, this fuel feed (11) being arranged along a burner axis (A) passing centrally through the swirl space (6), and having a mixing tube (4) adjoining the swirl body downstream via a transition piece (2). At least one additional fuel feed (13) for liquid fuel is provided in the region of the swirl body, the transition piece (2), and / or the mixing tube (4).
Owner:ANSALDO ENERGIA SWITZERLAND AG
Novel mesogens
InactiveUS20020177727A1High yieldImprove purification effectLiquid crystal compositionsThin material handlingCombinatorial chemistryMesogen
Owner:SOUTHWEST RES INST
Methods for synthesis of liquid crystals
InactiveUS20030055280A1High yieldNeed not be stabilized against polymerizationLiquid crystal compositionsThin material handlingCrystallographyMesogen
Owner:SOUTHWEST RES INST
Method and circuit for multi-standard sigma-delta modulator
ActiveUS6992606B2Increased stability rangeReduce operating frequencyElectric signal transmission systemsAnalogue conversionDigital subscriber lineIntegrator
System and method for a multi-standard sigma-delta modulator. A preferred embodiment comprises an integrator coupled to a signal input, wherein the integrator is configured to sum a difference between an input signal and an output of the sigma-delta modulator. A dithering circuit, also coupled to the signal input, is used to produce a dithering sequence. A summing point combines an output of the integrator and the dithering circuit while a quantizer converts the combined outputs into one of several discrete levels. The sigma-delta modulator further comprises a reset circuit to reset the sigma-delta modulator if the integrator becomes saturated. The sigma-delta modulator, as described, is compatible with G.Lite, ADSL, and ADSL+ variants of the digital subscriber line technical standards.
Owner:TEXAS INSTR INC
Sealing in a hydraulic turbine unit
InactiveUS7222861B2The method is simple and reliableImprove sealingEngine sealsLeakage preventionLiquid lineUnit system
System for providing sealing between a rotor and a turbine casing in a hydraulic turbomachine includes a sealing ring arranged in a peripheral region of the rotor. The sealing ring forms at least one hydrostatic bearing with respect to at least one of the rotor and the turbine casing. The at least one hydrostatic bearing includes at least two bearing surfaces which face one another. At least one of the at least two bearing surfaces is arranged on the sealing ring. At least another of the at least two bearing surfaces is arranged on at least one of the rotor and the turbine casing. At least one groove is formed on at least one of the at least two bearing surfaces. At least one pressure-liquid line is coupled to each of the at least one groove and a pressure-liquid supply. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.
Owner:GITTLER PHILIPP
Heat excanger with receiver tank, and refrigeration system
InactiveCN1494649AEasy to assembleIncrease volumeEvaporators/condensersSubcoolersEngineeringRefrigeration
A heat exchanger with a receiver tank is provided with a multi-flow type heat-exchange body (10), a receiver tank (3), a block flange (4) having a side surface connected to the periphery of a condensing portion outlet of the heat exchanger body (10) and an upper end to which a lower end of the receiver tank (3) is attached and a bracket (6) for supporting the upper part of the receiver tank (3) to the heat exchanger body (10). A flange-shaped pressing stepped portion (31a) is formed on the upper periphery of the tank main body (31) of the receiver tank (3). The bracket (6) is provided with a joint portion (61b) to be secured to the peripheral surface of one of headers (11) and embracing portions (61a) and (62a) that surround the periphery of the tank main body (31) and are engaged with the upper side of the pressing stepped portion (31a) to downwardly press the receiver tank (3). With this heat exchanger, stable refrigeration performance can be obtained and that the assembling operation can be performed easily.
Owner:SHOWA DENKO KK
Operating method for hydrogen/natural gas blends within a reheat gas turbine
InactiveUS20130091852A1Improve LBOIncreased stability rangeGas turbine plantsTurbine/propulsion fuel controlHydrogen concentrationModularity
A gas turbine is operated using a varying blend of a first fuel, preferably natural gas, and a second fuel that is hydrogen. The hydrogen concentration is varied depending on operating conditions in order to reduce emissions of CO and NOx, and / or to mitigate LBO. The fuel mixture is varied using a controller based on a combination of factors in a modular operation concept to address different issues according to relevant load limitations. A method of operating a gas turbine according to this modular operational concept is also provided.
Owner:ANSALDO ENERGIA IP UK LTD
Five-level feed-back digital-to-analog converter for a switched capacitor sigma-delta analog-to-digital converter
ActiveUS20060055581A1Improve performanceReduce power consumptionElectric signal transmission systemsAnalogue conversionEngineeringVoltage reference
A five-level feed-back digital-to-analog converter (DAC) in a switched capacitor sigma-delta analog-to-digital converter has an improved switching sequence that boosts from two to five the number of quantization levels of the feed-back DAC. Switching sequences are used to obtain five equally distributed charge levels C*VREF, C*VREF / 2, 0, −C*VREF / 2 and −C*VREF. When summed with an input voltage, VIN, the five-level feed-back DAC produces five equally distributed output voltages of A*VIN+VREF, A*VIN+VREF / 2, A*VIN+0, A*VIN−VREF / 2 and A*VIN−VREF, where A is gain, VIN is the input voltage, and VREF is the reference voltage.
Owner:MICROCHIP TECH INC
Resonator, and an aircraft fitted with the resonator
ActiveUS20170349271A1Improve performanceMinimize timeAcceleration measurement using interia forcesNon-rotating vibration suppressionSeismic massEngineering
A resonator having a support and a seismic mass. Movement means include a first electromagnetic assembly comprising a first electric coil that is not electrically powered. An actuator is connected to a processor unit, the processor unit electrically powering the actuator with adjustable electrical power. A resilient member is interposed between said seismic mass and said support.
Owner:EUROCOPTER
Vortex generators for generating vortices upstream of a cascade of compressor blades
ActiveCN102906429ALimit impactImprove efficiencyPump componentsBlade accessoriesEngineeringBiomedical engineering
The present invention relates to a bladed (1) assembly (2), particularly a flow straightener, for a turbomachine compressor, said bladed (1) assembly (2) comprising a plurality of individual devices (14A) that have an action on the flow, which are formed in such a way as at least to generate vortices (16). It is characterized in that each of said individual devices (14A) is provided upstream of said bladed (1) assembly (2) so as to act simultaneously on the main flow (E) and on a recirculating flow (G).
Owner:SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
Astigmatism self-compensation solid laser
InactiveCN102244357AIncreased stability rangeAchieving self-compensationLaser detailsResonant cavitySagittal plane
The invention provides an astigmatism self-compensation solid laser, which comprises a pump source, a resonant cavity and a gain medium, wherein the gain medium has thermal lens astigmatism; the resonant cavity is an astigmatic cavity; and the gain medium is arranged in the resonant cavity in a way that the direction, with relatively poorer thermal effects, of the gain medium is in the meridian plane of the resonant cavity and the direction with relatively better thermal effects is in the sagittal plane of the resonant cavity. The solid laser can be obtained by compensating the astigmatism of the resonant cavity and the thermal lens astigmatism without inserting an additional astigmatism compensation element, and is high in output power, conversion efficiency, beam quality and stability, simple, convenient and reliable.
Owner:SHANXI UNIV
Observer-based stability analysis method for time-delay haptic interface system
InactiveCN108614423AIncreased stability rangeReduce conservatismAdaptive controlSpatial modelObserver based
The invention aims at providing an observer-based stability analysis method for a time-delay haptic interface system. The method comprises: step one, establishing a mathematical model of each part ofa single-degree-of-freedom haptic interface system; step two, combining a haptic device with a retaining device, a sampling switch, and a time-delay characteristic and carrying out discretizing processing to obtain a discretized state space model of the haptic device with input delay; step three, designing a discrete state observer to estimate the state of the discrete haptic interface device andcalculating a feedback force according to a virtual environment model by using the estimated state as an input signal of a virtual environment; and step four, establishing a Lyapunov-Kolasovsky L-K function by using a time-delay segmentation idea, providing a time-delay-dependent asymptotic stability condition of the haptic interface system based on linear matrix inequality (LMI), acquiring a gainmatrix Ld of the observer and a parameter matrix Kd of a virtual wall as well as an allowable maximum time lag taum based on the stability condition.
Owner:HARBIN ENG UNIV
Cascade 2-mu m solid laser of double-wavelength mixed pumping
InactiveCN101741003AIncrease output powerImprove conversion efficiencyLaser arrangementsActive medium materialLaser technology2 μm laser
The invention relates to a cascade 2-mu m solid laser of double-wavelength mixed pumping, which belongs to the technical field of laser. Pumping light output by a double-wavelength mixed pumping source is focused on 2-mu m laser crystals, the 2-mu m laser crystals absorb the pumping light with different wavelengths lambda 1 and lambda 2 and obtain gains, the two 2-mu m laser crystals are cascaded to realize laser oscillation in a laser resonator comprising a laser totally reflecting mirror, a laser reflecting mirror of 45 degrees and a laser output mirror, and 2-mu m laser is output from the laser output mirror. The invention has the advantages that the absorption of the 2-mu m laser crystals to the pumping light can be increased, the thermal lens effect of the 2-mu m laser crystals is decreased, and the quality of the light beam of the 2-mu m output light is improved, thereby obtaining the output of the 2-mu m laser with high power and high efficiency.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Power electronic transformer system fault reconstruction method
ActiveCN111669029AImprove running stabilityAvoid damageAc-dc conversionEmergency protective circuit arrangementsCarrier signalSystem failure
The invention discloses a power electronic transformer system fault reconstruction method, and belongs to the technical field of power electronics. The middle protection switch is formed by connectingthree switch groups which are opened and closed at the same time with an upper output port, a clamping midpoint and a lower output port of the cascade rectifier in series respectively; when a power electronic transformer operates normally, the intermediate protection switch is in a closed state, and a DC-DC converter is in a put-in state; when the direct-current link of the power electronic transformer fails, the intermediate protection switch is quickly switched off; the method specifically comprises the following steps: carrying out carrier stacking calculation to generate a level k, and judging an area R where a modulation wave u* is located; according to k and R, establishing a switching state equation of an n sub-module cascade rectifier, and establishing a first switching state table; and acquiring and sorting the DC output voltage of each sub-module, performing smooth optimization processing on the obtained switching state, establishing a second switching state table, and matching the switching state in the second switching state table to each sub-module so that the reconstruction of the DC link fault is completed.
Owner:SOUTHWEST JIAOTONG UNIV
Three-phase-single-phase power electronic converter system and rectifier fault tolerance method thereof
PendingCN111277148AReduce the risk of output instabilityStable outputAc-ac conversionDc capacitorSingle-phase electric power
The invention discloses a three-phase-single-phase power electronic converter system and a rectifier fault tolerance method thereof. On the basis of a traditional three-phase-single-phase power electronic converter, an isolation switch group is added, the risk that rear-end equipment is damaged due to faults of a three-phase three-level rectifier to cause output instability of a traction network is reduced, the robustness of a single-phase three-level cascaded inverter is improved, and stable output of the traction network is guaranteed. During fault tolerance, the problems of override jump ofa switching pulse sequence SSi and unbalanced charging and discharging time of a direct current capacitor in a direct current link are fully considered. Fault-tolerant operation after a system faultis realized by utilizing charging and discharging of a direct-current capacitor to the greatest extent. The reliability of system operation is enhanced, the stability range of the system after fault tolerance is broadened, even if an extremely severe fault state occurs, i.e., after the three-phase three-level rectifier of a certain module completely quits operation due to a fault, the normal and stable operation of the system can still be ensured, and the network voltage of the traction network is not influenced by the fault.
Owner:SOUTHWEST JIAOTONG UNIV
Single concave cavity trapped vortex combustor
InactiveCN103277811BEfficient Emissions CombustionHigh Efficiency and Low Emissions CombustionContinuous combustion chamberCombustion chamberCombustor
A single-cavity trapped vortex combustor comprises a pressure expander, an inner cartridge receiver, an outer cartridge receiver, a flame tube, a flow guide device, a pre-evaporation device, an oil supply system and a high-energy spark plug, wherein airflow at an inlet of the combustor enters the combustor through the pressure expander, the flame tube is of a single-cavity structure, the inner cartridge receiver, the outer cartridge receiver and the flame tube form an inner duct and an outer duct of the combustor, the flow guide device separates the main flow from the air of the outer duct, air is decelerated and pressurized through the pressure expander, is divided into four paths through the flow guide device and the pre-evaporation device, and respectively enters the main flow, the pre-evaporation device, the inner duct and the outer duct, and the high-energy spark plug is arranged at the bottom of the cavity. The combustion area of the single-cavity trapped vortex combustor is divided into a trapped vortex area and a main combustion area, and the single-cavity trapped vortex combustor further comprises a flame joint supporting plate which transmits flames from a cavity to the main flow.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Middle-low speed maglev train cross track seam control system based on image processing
ActiveCN114043879AImprove detection accuracyMeet the needs of stable suspensionImage enhancementImage analysisImaging processingInterference resistance
The invention provides a middle-low speed maglev train cross track seam control system based on image processing. An image acquisition module acquires a suspension gap image and a track image through a binocular camera, and an image processing module and a gap calculation module process the images and calculate a suspension gap value d and a track-crossing joint distance L of an electromagnet; a suspension control module compares the received d value with a target suspension gap value, obtains a current value without a track gap through PID adjustment, carries out gap correction on the current value without the track gap through L and d, finally compares the current value with the current current value of an electromagnet to obtain a current deviation, and changes the duty ratio of a suspension chopper through the deviation so as to change the current of the suspension electromagnet, and stable suspension is kept. The dynamic rigidity of the system is improved, and the system has the characteristics of high anti-interference capability, high suspension stability and the like.
Owner:SOUTHWEST JIAOTONG UNIV
Fractional phase compensation control method and device for LCL grid-connected inverter under weak power grid
ActiveCN113517720AHarmonic suppressionFast dynamic responseSingle network parallel feeding arrangementsPower oscillations reduction/preventionGrid connected inverterControl signal
The invention relates to the technical field of grid-connected inverter control, and relates to a fractional phase compensation control method and device for an LCL grid-connected inverter under a weak power grid. The method comprises the steps: 1, respectively obtaining a voltage signal and a grid-connected current signal; 2, extracting voltage phase angle information; and generating a grid-connected current reference signal in the control system; 3, dividing the obtained grid-connected current signal into two paths, feeding back an inherent harmonic peak of an active damping suppression LCL grid-connected inverter through the grid-connected current, obtaining an error signal by subtracting the other path from the grid-connected current reference signal, and transmitting the error signal to a current controller for modulation; 4, after the error signal is modulated by a current controller, subtracting the error signal from a grid-connected current feedback active damping signal to obtain a modulated wave signal; and 5, comparing to obtain a control signal. The current controller structure is a proportional resonance parallel repetitive control structure with a fractional phase compensation function, the design is simple, and flexible fractional phase compensation can be provided under a weak power grid.
Owner:SICHUAN UNIV
Motor control method and circuit for stable operation of AC motor in full frequency band
ActiveCN107565863AIncreased stability rangeWide speed rangeElectronic commutation motor controlAC motor controlHigh speed controlLow speed
The invention provides a motor control method and circuit for stable operation of an AC motor in a full frequency band, the low-speed and high-speed control switching is smooth, the stable range is widened, the speed regulation range is wide, and the application is wide. The method includes the steps of performing deviation processing on a given current Idref generated according to a set frequencyand a feedback current Idfed generated by collecting a current of an AC motor; performing PID control on the obtained deviation to generate an initial given direct-axis voltage; performing amplitudelimiting on the initial given direct-axis voltage according to an operating direction of the AC motor to obtain a given direct-axis voltage Udref; obtaining the corresponding set rotational speed according to the set frequency and obtaining a given quadrature-axis voltage Uqref from the set rotational speed; and synthesizing the given direct-axis voltage Udref with the quadrature-axis voltage Uqref to output the value and angle of the control voltage of the AC motor.
Owner:XI AN JIAOTONG UNIV
Master-slave game type human-machine cooperative steering control method in ice and snow environment
ActiveCN113553726ACooperative Steering Control RealizationIncreased stability rangeGeometric CADDesign optimisation/simulationDriver/operatorMachine control
The invention provides a master-slave game type human-machine cooperative steering control method in an ice and snow environment, and aims to solve the problem of control conflicts between a driver and a cooperative steering controller in the ice and snow environment under the condition of target inconsistency. The method comprises the following steps of: adopting a corner-interactive human-machine fusion control scheme to linearize tire lateral deviation force, and establishing a steering system model of a co-driving vehicle in the ice and snow environment; considering the condition that human-machine control targets are inconsistent, reducing control conflicts by constructing a master-slave game relationship, and realizing a human-machine cooperative steering control that prioritizes a driver for target control. According to the method, under the ice and snow environment, when the driver and the cooperative steering control target are inconsistent and control conflicts occur, a human-machine cooperative steering control that prioritizes drivers for target control can be achieved; the tire lateral deviation force is fully utilized, the stability range of the automobile during steering is expanded, and the stability of the automobile during steering in the ice and snow environment is improved.
Owner:JILIN UNIV
a combined combustion chamber
ActiveCN105953265BEnhanced blendingImprove flame stabilityContinuous combustion chamberCycloneCombustion instability
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Resonator, and an aircraft fitted with the resonator
InactiveUS10472055B2Improve performanceMinimize timeAcceleration measurement using interia forcesNon-rotating vibration suppressionSeismic massActuator
A resonator having a support and a seismic mass. Movement means include a first electromagnetic assembly comprising a first electric coil that is not electrically powered. An actuator is connected to a processor unit, the processor unit electrically powering the actuator with adjustable electrical power. A resilient member is interposed between said seismic mass and said support.
Owner:EUROCOPTER
Ecological electrode, electric energy storage device and preparation method thereof
PendingCN114342123AGuaranteed electrochemical stabilityGuaranteed normal operationAlkaline accumulatorsLi-accumulatorsComposite electrodeEngineering
The invention discloses an ecological electrode, an electric energy storage device and a preparation method thereof. The present invention relates to a composite electrode for a device for storing electrical energy wherein the electrode comprises an electrode body and an electrode housing wherein the body comprises at least one water-soluble polymer and at least a portion of the housing comprises a housing comprising at least one organic or organometallic material. The invention also relates to a device for storing electrical energy comprising the composite electrode and a method for preparing the composite electrode.
Owner:道达尔能源公司 +1
Cascade 2-mu m solid laser of double-wavelength mixed pumping
InactiveCN101741003BIncrease output powerImprove conversion efficiencyLaser arrangementsActive medium materialLaser technology2 μm laser
The invention relates to a cascade 2-mu m solid laser of double-wavelength mixed pumping, which belongs to the technical field of laser. Pumping light output by a double-wavelength mixed pumping source is focused on 2-mu m laser crystals, the 2-mu m laser crystals absorb the pumping light with different wavelengths lambda 1 and lambda 2 and obtain gains, the two 2-mu m laser crystals are cascadedto realize laser oscillation in a laser resonator comprising a laser totally reflecting mirror, a laser reflecting mirror of 45 degrees and a laser output mirror, and 2-mu m laser is output from the laser output mirror. The invention has the advantages that the absorption of the 2-mu m laser crystals to the pumping light can be increased, the thermal lens effect of the 2-mu m laser crystals is decreased, and the quality of the light beam of the 2-mu m output light is improved, thereby obtaining the output of the 2-mu m laser with high power and high efficiency.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Motor control method and circuit for stable operation of AC motor in full frequency range
ActiveCN107565863BIncreased stability rangeWide speed rangeElectronic commutation motor controlAC motor controlHigh speed controlElectric machine
The invention provides a motor control method and circuit for stable operation of an AC motor in a full frequency band, the low-speed and high-speed control switching is smooth, the stable range is widened, the speed regulation range is wide, and the application is wide. The method includes the steps of performing deviation processing on a given current Idref generated according to a set frequencyand a feedback current Idfed generated by collecting a current of an AC motor; performing PID control on the obtained deviation to generate an initial given direct-axis voltage; performing amplitudelimiting on the initial given direct-axis voltage according to an operating direction of the AC motor to obtain a given direct-axis voltage Udref; obtaining the corresponding set rotational speed according to the set frequency and obtaining a given quadrature-axis voltage Uqref from the set rotational speed; and synthesizing the given direct-axis voltage Udref with the quadrature-axis voltage Uqref to output the value and angle of the control voltage of the AC motor.
Owner:XI AN JIAOTONG UNIV
Electromechanical systems device with segmented electrodes
InactiveCN105143956AIncreased stability rangeNo significant reduction in total electrode areaCathode-ray tube indicatorsPiezoelectric/electrostrictive devicesElectricityEngineering
This disclosure provides systems, methods and apparatus for increasing a range of stable travel positions of a movable layer within electromechanical systems (EMS) devices. In one aspect, an electrically isolated floating electrode can be disposed between a driving electrode within a movable layer and a fixed electrode in order to increase a stable travel range of the movable layer. By segmenting the electrically isolated floating electrode into multiple isolated electrode segments, unbalanced charge accumulation in response to tilting of the movable layer can be constrained to further increase the stable travel range of the movable layer.
Owner:SNAPTRACK
Magnetic support electrical drive device
InactiveCN1258857CAchieve short pitchIncreased stability rangeSynchronous machine detailsShaftsMagnetomotive forceThree degrees of freedom
The invention relates to an economical, non-wearing, electrical permanent magnet drive for actively controlling the rotor position in three degree of freedom. The stator windings produce superimposed fields with different pole numbers in the pole pitches by unsymmetrical magnetomotive force distributions.
Owner:LEVITRONIX TECH
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