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197results about How to "Eliminate disturbance" patented technology
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Servo control strategy and system for simultaneously eliminating counter potential and load torque disturbance
ActiveCN106533299AOvercome inaccuraciesImprove static performanceVector control systemsDynamo-electric converter controlLoad torqueEngineering
Owner:SHANDONG UNIV
Method and system for determining position and orientation of an object
InactiveCN101142496AEliminate disturbancePermanent monitoring of the refractive indexActive open surveying meansElectromagnetic wave reradiationPhysicsRadiation
The invention relates to a positioning method for determining the position and orientation of a mobile unit having a receiver (3'), whereby the receiver (3') is detected by a scanner (2'), said scanner (2') determining at least the distance and a direction in relation to the receiver (3'). The radiation emitted by the sensor is detected by the receiver (3') and the direction of incidence of radiation and the direction of incidence of radiation in relation to an axis of reception are derived while an offset of the incident radiation in relation to the axis of reception (EA) is determined. Position and orientation of the unit are derived from at least the distance, the direction in relation to the receiver (3'), the offset and the direction of incidence as the position information and the unit is optionally controlled via the optical connection (OV).
Owner:BEAMRIDER
Variable air volume room temperature control method based on fuzzy PID and prediction control algorithm
InactiveCN104154635ASolve technical problems that require high precisionGood precisionMechanical apparatusSpace heating and ventilation safety systemsVariable air volumePoor adaptive skills
The invention discloses a variable air volume room temperature control method based on fuzzy PID and a prediction control algorithm. The method comprises the steps that the temperature deviation between an expected room temperature and an actual room temperature is input to a fuzzy adaptive PID controller, PID parameter incremental quantity of the opening degree of a tail end air valve is obtained through calculation, and calibrated opening degree of the tail end air valve is output; the opening degree of the tail end air valve of the fuzzy adaptive PID controller is subtracted from the opening degree of the tail end air valve of a previous moment by utilizing a time delay link to obtain the variable quantity of the opening degree of the tail end air valve; the prediction control algorithm is adopted to obtain the actual opening degree of the tail end air valve through the variable quantity of the opening degree of the tail end air valve, and the room temperature is maintained at a set value and is kept unchanged. The control method combining the fuzzy PID with the prediction control algorithm is adopted to solve the technical problems that parameter setting difficulty is large, working condition adaptive capacity is poor, and adaptive ability is weak in an air conditioning system in the prior art.
Owner:HOHAI UNIV CHANGZHOU
Self-adaptive control method for modes of low-voltage microgrid
InactiveCN105811400AEliminate disturbanceAvoid disturbanceEnergy industrySingle network parallel feeding arrangementsVirtual synchronous generatorLow voltage
The invention relates to a self-adaptive control method for modes of a low-voltage microgrid. The method comprises the following steps of (1) obtaining power operation parameters of the low-voltage microgrid and constructing a droop control model of the low-voltage microgrid based on a virtual synchronous generator; (2) adding a low-pass filter between a virtual synchronous generator control link and a filter inductor to carry out voltage and current sampling of the filter inductor in the droop control model of the low-voltage microgrid based on the virtual synchronous generator; (3) adding a stability controller between the virtual synchronous generator control link and the reactive power and active power reference value signals while adding a reactive integral gain link between the stability controller and the reactive power reference value signal to obtain a modified droop control model of the low-voltage microgrid; and (4) carrying out mode switching on the low-voltage microgrid according to the modified droop control model of the low-voltage microgrid. In comparison with the prior art, the method has the advantages of disturbance elimination, stable switching, high stability, strong practicability and the like.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
Measuring system for a medium flowing in a process line
ActiveCN101553714AEliminate disturbanceEasy to captureVolume meteringVolume/mass flow by dynamic fluid flow effectLine tubingEngineering
The measuring system is placed in the course of a process line and is used to detect at least one measurement variable of a medium flowing in the process line. The system comprises a measuring sensor for this purpose with a measuring tube that conducts the medium to be measured and a sensor assembly which has at least one sensor element that reacts primarily to the measurement variable to be detected and which supplies at least one measurement signal that is influenced by the measurement variable by means of the sensor element or elements. In addition, the measuring system comprises measuringelectronics that communicate with the measuring sensor and that use the measurement signal(s) to generate, at least intermittently, at least one measured value that represents the current measurementvariable. The measuring tube of said measuring system has a smaller flow cross-section than a supply segment of the process line that is connected to the inlet side of the measuring system. The measuring system therefore also has a flow conditioner that is situated on the inlet side of the measuring tube, extends between said tube and the supply segment of the process line and has a lumen which tapers towards the measuring tube and through which the medium flows during operation. The flow conditioner has at least one baffle which is situated upstream of the outlet end of said conditioner, projects into the lumen of the latter and against which the medium in the conditioner flows.
Owner:ENDRESS HAUSER FLOWTEC AG
Rotor wing control mechanism for coaxial helicopter
The invention discloses a rotor wing control mechanism for a coaxial helicopter. The mechanism comprises an outer shaft, an inner shaft, an inner and outer shaft supporting base, an outer automatic tilting device, an inner automatic tilting device, a middle ring, a third connecting device, a plurality of lower pull rods, a plurality of first connecting devices, a plurality of lower horizontal rods, a plurality of second connecting devices, a plurality of lower rotor wing propeller hubs which are mounted on the propeller hub head of the outer shaft, a plurality of upper rotor wing propeller hubs which are mounted on the propeller hub head of the inner shaft, a plurality of upper rotor wing variable-pitch rocker arms which are connected with the inner ends of the upper rotor wing propeller hubs, and a plurality of lower rotor wing variable-pitch rocker arms which are connected with the inner ends of the lower rotor wing propeller hubs. Lower rotor wing control mechanisms are distributed into a helicopter body fairing and a lower rotor wing fairing, and upper rotor wing control mechanisms are distributed in a rotor wing shaft. Through the adoption of the mutual matching and control of the lower pull rods and long pull rods, the synchronous control of the total distance, the differential action control of the total distance, and the control of the cyclic variable pitch for an upper rotor wing and a lower rotor wing can be realized through all parts.
Owner:CHINA ACAD OF AEROSPACE AERODYNAMICS
Method for conducting rapid initial alignment on vehicle load inertial navigation motion based on auto-disturbance-rejection control
InactiveCN105806365ATroubleshoot initial alignment issuesFast convergenceNavigation by speed/acceleration measurementsActive disturbance rejection controlComputer science
The invention discloses a method for conducting rapid initial alignment on vehicle load inertial navigation motion based on auto-disturbance-rejection control.The method is characterized by comprising the following steps that 1, before a vehicle is started, inertial navigation is initialized, and coarse alignment under the condition of an inertial navigation static base is completed; 2, after the vehicle is started, the observation quantity is constructed through inertial navigation and velocity information output by a mileometer; 3, a motion fine alignment loop is designed through the observation quantity, an inertial navigation error equation and an auto-disturbance-rejection control method; 4, parameters of an auto-disturbance-rejection controller are adjusted and finalized; 5, a feedback matrix is constructed through the misalignment angle output by an observer, so that initial alignment of vehicle load inertial navigation motion is achieved.By means of the steps, the coarse alignment method, observation quantity construction, the design method of the auto-disturbance-rejection control loop and the like adopted before the loaded vehicle is started are described in details; by means of the method, statistics characteristics of noise do not need to be known in advance, a quite precise model is not needed either, and the rapid inertial navigation alignment problem under the vehicle load environment and the problem of compensation under the external disturbance in the vehicle load process of inertial navigation can be solved.
Owner:BEIHANG UNIV
Automatic regulation method for comprehensive combustion in circular fluidized bed boiler
InactiveCN1441193AImprove stabilityEliminate disturbanceFluidized bed combustionApparatus for fluidised bed combustionAutomatic controlAir volume
The present invention relates to automatic control and regulation in the industrial combustion reaction process between solid fuel and air. The automatic regulation process for comprehensive combustion in circular fluidized bed reactor features fast load regulation with blowing rate, load stabilization and bed temperature regulation with coal feeding amount, fast air / coal ratio regulation, oxygen regulation to ensure the economical efficiency and negative regulation with induced draft. The regulation mode includes single loop for regulating negative pressure in hearth, composite cascade loop for regulating boiler load and bed temperature, and cascade loop for regulating oxygen content in fume. Compared with traditional techonlogy, the present invention has greatly improved stability, fast disturbance elimination and high economical utility.
Owner:BEIJING HOLLYSYS
Pulsing signal recognition device and method
ActiveCN101136624AImprove accuracyEliminate disturbanceX/gamma/cosmic radiation measurmentPulse manipulationPeak valueParallel processing
This invention discloses an identifying device for pulse signals including a base line calculation module, a subtracter and a peak value identifying module, in which, said base line calculation module receives data of pulses during a discontinuous period to form a data array and compute base line value according to the data array, said subtracter receives pulse data and the base line value and detracts the base line value with the pulse data to get related pulse data to be output to the identifying module, which can identify data directly not necessary to store data based on the parallel process to digital logic circuit and carries out identification to input pulse signals according to the identifying rule and output peak values meeting the rule in all the pulses in a stipulated time period and gives the corresponding writing enable signals of the peak value data used in storing operation.
Owner:SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD +1
Nitration denitrificatoin and filter method and nitration denitrification and filter device for double-sludge series-connection aeration biofilter
ActiveCN102627353AAchieve separationImprove nitrogen removal efficiencyTreatment with aerobic and anaerobic processesDeoxidizationSewage
The invention discloses a nitration denitrificatoin and filter method and a nitration denitrification and filter device for a double-sludge series-connection aeration biofilter. The nitration denitrification and filter device is mainly composed of a water inlet system, a first section aeration biofilter, a second section aeration biofilter and a clean water tank, wherein the first section aeration biofilter is divided into a denitrification zone and a decarburization zone, suspended biological carriers serving as fillers are arranged in the denitrification zone, the second section aeration biofilter is connected with the decarburization zone of the first section aeration biofilter through a gas-water separator arranged in a middle water layer, and the second section aeration biofilter is divided into a nitration zone and a nitration deoxidization filter zone. The nitration denitrification and filter method comprises that denitrification and aerobic decarburization of waste water are respectively achieved through the denitrification zone and the decarburization zone of the first section aeration biofilter, ammonia nitrogen is converted into nitrate nitrogen through the second section aeration biofilter, electron acceptors are provided for the denitrification zone of the first section aeration biofilter, and chemical oxygen demand (COD), nitrogen (N) and suspended solid (SS) areremoved. The system nitration denitrificatoin and filter method and the nitration denitrification and filter device for the double-sludge series-connection aeration biofilter can achieve function separation of denitrification, decarburization and nitration and have the advantages of saving energy, being stable and denitrifying efficiently.
Owner:北控水务(中国)投资有限公司
Dual-sludge denitrification dephosphorizing and denitrifying A/A-O device and method
ActiveCN102583743AReduce yieldImprove filtering effectTreatment with aerobic and anaerobic processesSludgePrecipitation
The invention discloses a dual-sludge denitrification dephosphorizing and denitrifying A / A-O device which mainly comprises a primary precipitation pool, an anaerobic-anoxic device, a secondary precipitation pool, a middle pool, a biological aerated filter and a clear water pool, wherein the primary precipitation pool is connected with an anaerobic zone of the anaerobic-anoxic device, a degassing zone of the anaerobic-anoxic device is connected with the secondary precipitation pool, and the secondary precipitation pool is connected with the anaerobic zone of the anaerobic-anoxic device througha sludge pump; the outflow water of the secondary precipitation pool is connected to the middle pool, the middle pool is connected with the biological aerated filter, and the biological aerated filter is connected with the clear water pool; and the clear water pool is connected with the anaerobic-anoxic device. By the process adjustment, denitrifying phosphorus accumulating bacteria becomes dominant bacteria of an AAO unit. The dual-sludge denitrification dephosphorizing and denitrifying A / A-O device realizes the separation of phosphorus accumulating bacteria and nitrobacteria, the separationof the precipitation function and the sludge storage function of the secondary precipitation pool, and the separation of the nitrification function and the filtering function of the biological aerated filter, thereby realizing energy conservation of a combined system, stability and efficiency in denitrification and dephosphorization, and sludge reduction.
Owner:上海立源生态工程有限公司
One-phase short-circuit fault-tolerant direct torque control method for five-phase permanent magnet motor
ActiveCN109842336ATake advantage ofGuaranteed uptimeElectronic commutation motor controlAC motor controlPhase currentsSwitching frequency
The invention discloses a one-phase short-circuit fault-tolerant direct torque control method for a five-phase permanent magnet motor. The one-phase short-circuit fault-tolerant direct torque controlmethod comprises the steps of: when an open-circuit fault of an A phase occurs, deducing a healthy-phase open-circuit fault-tolerant current, a fault-tolerant transformation matrix T4 / 2 and an inversematrix thereof T2 / 4 according to constraint conditions that a stator flux linkage vector is unchanged before and after the fault, a sum of healthy-phase currents is zero and the copper consumption isminimum; when a short-circuit fault of the A phase occurs, deducing a residual healthy-phase compensation flux linkage according to the principles that the stator flux linkage vector is unchanged before and after the fault and the copper consumption is minimum, or according to the constraint conditions that the healthy-phase compensation current amplitudes are equal and a sum of healthy-phase compensation currents is zero; and acquiring a stator phase voltage command through combining a stator flux linkage with a torque observer, setting torque and stator flux linkage amplitude and carrying out coordinate transformation, and combining the voltage with a pulse width modulation technology based on zero-sequence voltage injection to achieve consistent steady-state performance and dynamic performance before and after the motor short-circuit fault. The one-phase short-circuit fault-tolerant direct torque control method has the advantages of constant switching frequency of an inverter and small CPU overhead.
Owner:JIANGSU UNIV
Synchronous powder spreading type metal laser 3D printing powder feeding device
ActiveCN106694883AReduce flow velocityReduce shockAdditive manufacturing apparatusIncreasing energy efficiencyElectric machinerySynchronous motor
A synchronous powder spreading type metal laser 3D printing powder feeding device comprises a powder storage bin (1), a powder feeding bin (2), a powder feeding belt (3), a powder spreading head (4), a driving transmission gear (5), a driven transmission gear (6), a driving motor (7), a cross beam (18), a cladding head (19) and a shell (11). The powder feeding bin is fixed to the cladding head through a rolling bearing and rotates freely. A transmission gear is installed on the upper portion of the powder feeding bin and meshes with the other transmission gear to form a transmission gear pair, and preset movement is achieved under driving of the motor. The powder storage bin stays still but keeps sliding relative to the powder feeding bin. Powder enters the powder feeding belt from a bottom outlet of the powder feeding bin, is fed to the powder spreading head under driving of a driving wheel and is evenly spread on a base plate under the action of gravity to form a powder layer. The powder spreading head and the shell are together fixed to the cladding head. The powder feeding bin and the cladding head move coordinately through procedure setting, the effect that the powder layer is always directly in front of a laser spot is ensured, and circulating water is adopted for cooling in the powder spreading head.
Owner:INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
Model prediction current control method of permanent magnet synchronous motor
ActiveCN111600523AGood dynamic and steady state performanceRobustElectronic commutation motor controlAC motor controlPhase lineLoop control
The invention discloses a model prediction current control method of a permanent magnet synchronous motor. The method comprises the following steps: obtaining a d-axis current disturbance item and a q-axis current disturbance item; obtaining three-phase current, three-phase line voltage and rotating speed signals of a permanent magnet synchronous motor, and obtaining a d-axis current observation value, a q-axis current observation value, a d-axis current disturbance item observation value and a q-axis current disturbance item observation value by utilizing a linear expansion state observer; obtaining a d-axis output value and a q-axis output value of a disturbance controller, obtaining an inductance prediction value by using an inductance extraction algorithm, and obtaining a d-axis current prediction value and a q-axis prediction current value in combination with an incremental prediction model; and adjusting the switching signal of the permanent magnet synchronous motor by using theinductance prediction value, the d-axis current prediction value and the q-axis prediction current value so as to realize the closed-loop control of the permanent magnet synchronous motor, so that therobustness of a permanent magnet synchronous motor model prediction current control algorithm is improved.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Device and method for improving casting blank quality of continuous casting production
The invention discloses a device and method for improving casting blank quality of continuous casting production. The device comprises a plurality of casting-rolling mill racks arranged in the casting strand direction, an electromagnetic linear period symmetric stirring unit and a drive adjustment type secondary cooling water control unit. The casting-rolling mill racks are used for artificially and forcibly forming solidification tail ends and arranged on a casting strand horizontal area. The electromagnetic linear period symmetric stirring unit is arranged on a casting strand arc area. The drive adjustment type secondary cooling water control unit is used for conducting stepless water spraying cooling on the surfaces of casting blanks based on real-time measuring. The liquid core large-rolling-reduction casting-rolling device and technology used for artificially and forcibly forming the solidification tail ends form the large rolling reduction in the thickness direction of the casting blanks, so that the solidification tail ends are artificially and forcibly formed inside the casting blanks, conditions for forming defects in the natural solidification process of the casting blanks are terminated, flowing of solute element molten steel enriched in the casting blanks is prevented, and the effects of homogenizing and density inside the casting blanks are improved.
Owner:CHINA NAT HEAVY MACHINERY RES INSTCO
Remote LIBS element quantitative analysis method based on weighted multispectral calibration
ActiveCN103411931ASolving Quantitative Analysis ChallengesSolving Quantitative Analysis ProblemsAnalysis by material excitationEnvironmental geologyLine strength
The invention discloses a remote LIBS (Laser-induced Breakdown Spectroscopy) element quantitative analysis method based on weighted multispectral calibration. The method comprises the following steps: firstly, achieving remote target LIBS spectral acquisition of a test site, and in the process, qualitatively obtaining major element compositions of the remote target to be tested, as well as the line strengths of multiple spectral lines of elements to be tested; then, finishing laboratory sample calibration and obtaining the relation fitted equation between the strengths and the percentage contents of the multiple lines of the elements to be tested; finally, quantitatively calculating the percentage contents of the elements to the tested according to the multispectral weighting method. The method can solve the remote LIBS element quantitative analysis problems better.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Method for inhibiting moving-gimbal effects of single gimbal magnetically suspended control moment gyroscope
InactiveCN101709969AEliminate additional torque disturbancesEliminate disturbanceRotary gyroscopesSpacecraft guiding apparatusEquation of stateControl moment gyroscope
The invention relates to a method for inhibiting moving-gimbal effects of a single gimbal magnetically suspended control moment gyroscope. In the method, a state equation of the single gimbal magnetically suspended control moment gyroscope is set up according to newton second law and a gyro technique equation; an inversion analysis of a system is calculated by utilizing an inverse system method; in a rotor system, moving-gimbal displacement of a magnetically suspended rotor is eliminated through state feedback of rotor displacement, an rotor reflection angular speed and a gimbal angular speed, and in a gimbal system, reactionary torque interference of the rotor to the gimbal system is eliminated through state feedback of the gimbal angular speed and the rotor reflection angular speed; and a robust servocontrol strategy is adopted to improve the robustness of the whole system. In the method, the moving-gimbal displacement of the magnetically suspended rotor is eliminated, the reactionary torque interference of the rotor system to the gimbal system is also eliminated in the gimbal moving process, and the stability and precision of the whole single gimbal magnetically suspended control moment gyroscope are improved. The method belongs to the technical field of aerospace control, and can be applied to high-precision control of magnetically suspended control moment gyroscopes.
Owner:BEIHANG UNIV
Well drilling orientating sensor
InactiveCN106988727AReduce difficultyEliminate disturbanceSurveyConstructionsControl systemWell drilling
A well drilling orientating sensor can achieve the high anti-interference capacity, the high precision and high guiding operation efficiency and is installed in a measurement and control system connected with a drilling-following measurement tool through an inserted shaft. The well drilling orientating sensor comprises an orientating sensor body, a magnetic orientation angular compensator and an inductive coil.
Owner:青岛智腾科技有限公司
Method and device for testing spectral pupil laser differential confocal CARS micro-spectrum
InactiveCN107167455AImprove signal-to-noise ratioImprove system horizontal resolutionAnalysis by material excitationPhysicsSpectral imaging
The invention belongs to the technical field of micro-spectral imaging detection and relates to a method and device for testing a spectral pupil laser differential confocal CARS micro-spectrum. The core thought is as follows: Rayleigh light and CARS light loaded with tested sample spectral characteristics are excited by double lasers as a light source; and nondestructive separation is carried out on the Rayleigh light and the CARS light by using a dichroic optical system, wherein the Rayleigh light is subjected to geometrical detection and positioning, and the CARS light is subjected to spectrum detection. By using the characteristic that a zero crossing point of the spectral pupil laser differential confocal curve accurately corresponds to a focus position, the focus position of an excitation beam is accurately captured and positioned, and high-precision geometrical detection and high-spatial-resolution spectrum detection are achieved to form the method and device capable of achieving high-spatial-resolution spectrum detection of a sample micro-region. Through combining a CARS microscopical technique, the excited Raman scattering light loaded with sample information is shorter than a traditional spontaneous Raman effect in time, and the sample can be quickly subjected to nondestructive detection. The method and the device have the advantages of accurate positioning, high spatial resolution, nondestructive detection and high spectrum detection sensitivity, and a new way is provided for micro-region spectrum detection and geometrical measurement.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Method for controlling outlet temperature of electric heater in supercritical water treatment system
InactiveCN102176178ARemove the disturbance as soon as possibleEliminate disturbanceAuxillary controllers with auxillary heating devicesFurnace temperatureTemperature control
The invention relates to a method for controlling the outlet temperature of an electric heater in a supercritical water treatment system. The method is characterized by comprising the following steps: introducing a furnace temperature controller as an auxiliary controller in a cascade control mode to control the power output of the electric heater; forming a negative feedback loop by utilizing a control variable introduced to an inner ring; and introducing fluid flow as feedforward into the control so as to directly act on the power output of the electric heater; performing difference value comparison on the inlet temperature and outlet temperature of the heater, and limiting the amplitude of the whole control output according to the required power fitting calculation formula. The method can be used for effectively overcoming the disturbance of self thermal inertia, inlet temperature changes and fluid flow changes of the electric heater on the outlet temperature control of the electric heater, and realizing quick and accurate control on the outlet temperature of the electric heater.
Owner:XI AN JIAOTONG UNIV +1
Three-axis accurate angular motion control method
InactiveCN101299148APosition servo tracking error reductionLinkage performance improvementElectric controllersAdaptive controlTracking errorLinkage concept
The present invention belongs to a device for simulating the three-axis gesture movement, and relates to a method for controlling the three-axis accurate angular movement. The device timely generates an orthogonal harmonic compensation control signal related to the variation of rotation angle with a control calculating device according to the harmonic characteristic of the disturbance of in-axis coupling torque and real-time calculates and regulates the amplitude of each stage of subharmonic signal according to the servo error of system, and applies the compensation control signal to the independent basic closed-loop servo-controlled loop of the corresponding axis. The invention adopts a strategy and a system structure which execute harmonic self-adapting feedback control to the in-axis movement coupling torque disturbance caused by the structural mass arrangement. The tracking error of position servo between each axis in the linkage angular rate state is evidently reduced, and the linkage capability is greatly improved.
Owner:中国航空工业第一集团公司北京航空精密机械研究所
Method and device for measuring sediment concentration of vertical fracture surface of model by means of optical method
InactiveCN106370563AEliminate disturbanceImprove efficiency in measuring sediment concentrationHydrodynamic testingParticle size analysisDistribution characteristicHydrology
The invention provides a method and device for measuring sediment concentrations of multiple points on a model through a laser, and belongs to the field of hydraulic model experiments. The method comprises the steps of water body sediment concentration and laser photo relationship calibration, water body sediment concentration measurement, water body sediment concentration calculation and water body sediment movement speed calculation; the device comprises an image acquisition module, a synchronization module, a laser device and a reflector, and the image acquisition module comprises an endoscope and an exposer. The method and device have the advantages that water disturbance is eliminated, and vertical distribution characteristics of sediments are obtained; the efficiency of measuring the sediment concentrations in the model experiments is improved; the sediment movement speed can be obtained; a brand-new sediment concentration measurement solution is provided.
Owner:NANJING HAWKSOFT TECH
Method for eliminating background light disturbance in camera-equipped indoor visible light positioning system
The invention relates to a method for eliminating a background light disturbance in a camera-equipped indoor visible light positioning system, wherein the method belongs to the technical field of visible light communication. According to the method, LEDs asynchronously transmit signals. A plurality of times of iteration averaging are adopted for eliminating the background light disturbance in the signals which are detected by the camera, thereby realizing more stable indoor visible light positioning. The method is characterized in that different-frequency signals are exerted on different LEDs; the signals which are transmitted by the LEDs are received by the camera, an image is formed through the signals and is converted to a gray scale image; iteration averaging is performed on continuous N gray scales in the gray scale image; the gray scale which is obtained through interaction average of the N gray scales is subtracted from the gray scale of the gray scale image, namely elimination of background light disturbance is realized; then fast Fourier transformation (FFT) is performed on the signal after background light disturbance elimination; a frequency which corresponds with an amplitude spectrum peak value is acquired; the above processes are repeated for M times; a largest frequency in the results of M times of processes is compared with a built-in LED frequency-coordinate database in an intelligent terminal; and the coordinate of the LED lamp is obtained, namely positioning is realized.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Dust hood for blast furnace tap hole
InactiveCN102586522AImprove capture efficiencyImprove working environmentDischarge devicesDust arrestersWorking environmentEngineering
The invention discloses a dust hood for a blast furnace tap hole. The dust hood for the blast furnace tap hole comprises a top-suction dust hood and a side-suction dust hood, wherein the top-suction dust hood is arranged above the outer side of the blast furnace tap hole, and the side-suction dust hood is arranged at one side of a molten iron trough, which is connected with the blast furnace tap hole; the top-suction dust hood comprises a first dust removal pipe and a first dust hood connected with the first dust removal pipe; the side-suction dust hood comprises a second dust removal pipe and a second dust hood connected with the second dust removal pipe; and the hood mouth of the side-suction dust hood is inclined. According to the dust hood for the blast furnace tap hole, the energy consumption can be reduced, the working environment of a casting house is improved and the smoke dust collection efficiency can be increased.
Owner:WISDRI ENG & RES INC LTD
Quick initial coarse alignment method of inertial navigation system suitable for shipborne communications on the move
ActiveCN105043418AImprove horizontal attitude angle accuracySimplify complexityMeasurement devicesNatural satelliteAccelerometer
The invention provides a quick initial coarse alignment method of an inertial navigation system suitable for shipborne communications on the move. The method includes the following steps that firstly, satellite position information is read, and a projectional component of a satellite under the geographic coordinate system of the inertial navigation system is computed; secondly, the angle of pitch and the angle of roll of the inertial navigation system is worked out through the accelerometer information in short time; finally, the azimuth angle and the angle of pitch of an antenna are read at this moment, and the projectional component of the satellite under the carrier coordinate system of the inertial navigation system is computed; the course angle of the inertial navigation system is worked out through the projectional component and the angle of pitch and the angle of roll of the inertial navigation system, and quick initial coarse alignment of the inertial navigation system is completed. The method is suitable for initial coarse alignment of the inertial navigation system of the shipborne communications on the move under the mooring state.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES
Digital image confrontation sample defense method based on truncated singular values and pixel interpolation
PendingCN112287973AEliminate disturbanceEnsure source securityGeometric image transformationCharacter and pattern recognitionComputer visionSingular value decomposition
Research on resistance machine learning shows that a deep learning architecture is easily attacked by an adversarial sample. The carefully designed small disturbance can cause wrong classification ofnormal images by the neural network, but cannot cause recognition errors to a human vision system. The invention provides a digital image adversarial sample defense method based on truncated singularvalues and pixel interpolation, and the method is based on pixel matrix analysis and image pixel interpolation processing, so as to achieve the purpose of restoring the normal recognition of an imagein a deep learning model. Under the condition of ensuring that normal pictures are not mistakenly classified by the deep learning model due to the operation, countermeasure attacks can be effectivelydefended. According to the method, matrix analysis and singular value decomposition are effectively utilized, an optimal approximation image highly similar to an adversarial sample is reconstructed byreserving a large singular value, and the reconstructed image can be correctly recognized by a deep learning model after pixel interpolation processing. In addition, the unpredictability of the defense model can be improved through pixel interpolation, and therefore the purpose of defending against black box attacks is achieved.
Owner:BEIHANG UNIV
On-line optimized wireless network data transmission method based on transmission data package length
InactiveCN101227414AImplement scrolling optimizationImprove data transfer efficiencyData switching networksWireless communicationNetwork packetTransfer procedure
The invention discloses a wireless network transmission method which is based on transmission data packet length on line optimization. The data transmission method comprises calculating the length of an optimum transmission data packet which is suitable for current network to transfer according to the relationship among optimum value of the length of a transmission data packet of wireless network, expect value of transmission time of continuous on line of network and network transmission speed, approximately calculating the expect value of transmission time of continuous on line of network through arithmetical average algorithm, and estimating transmission speed through average network transmission speed of forwards continuous on-line transmission time. The transmission method dynamically adjusts the length of a transmission data packet in the wireless network transmission process on line through utilizing the above algorithm, thereby improving data transmission property under wireless network condition. The data transmission method which is provided by the invention can effectively reduces network transmission flow in data transmission process, which improves the efficiency of data transmission under wireless network environment, and lowers data transmission cost of wireless network.
Owner:ZHEJIANG UNIV
Marine fixed point observation equipment operation state abnormity detection method and device
ActiveCN108898223AEasy to operateEliminate disturbanceNeural architecturesNeural learning methodsAlgorithmAnomaly detection
The invention provides a marine fixed point observation equipment operation state abnormity detection method and device. The method comprises the steps: acquiring a first observation sequence collected by the marine fixed-point observation equipment in the normal operation state; training the preset first initial wavelet neural network prediction model set based on the first observation sequence so as to determine a first wavelet neural network prediction model including the first optimal structure with the minimum global error; constructing the prediction interval corresponding to the prediction value according to the synthetical uncertainty of the first wavelet neural network prediction model; processing the second observation sequence to be predicted by the first wavelet neural networkprediction model and outputting the prediction result according to the comparison result between the processing result and the prediction interval; and if the prediction interval is not exceeded, thepotential abnormity can be determined by cooperation of multiple observation sequences. Therefore, the disturbance caused by the non-equipment fault factors in the abnormity detection result can be removed and the false alarm rate can be reduced, and the operability of the fault detection method for the marine observation instrument can be greatly improved.
Owner:STATE OCEAN TECH CENT
Digital low-and-medium-frequency self-adaptive three-phase half-controlled rectifying device and triggering method thereof
The invention discloses a digital low-and-medium-frequency self-adaptive three-phase half-controlled rectifying device and a triggering method thereof. The device mainly comprises a synchronous signal conditioning circuit, a digital control circuit and a pulse amplifying circuit. After passing through optically coupled isolation, alternating-current voltage signals are sent into the digital control circuit by the conditioning circuit; and a controller MCU (Microcontroller Unit) calculates the period according to the sent synchronous signals and updates a control angle so as to generate three paths of triggering signals. The pulse amplifying circuit amplifies the signals and then triggers a three-phase half-controlled bridge so as to implement controllable rectification. In the method, three phases are triggered in sequence according to a software program designed by the controller in the digital control circuit; and after a sampling voltage value and a preset voltage value are compared, the control angle is calculated by a PID (Proportion Integration Differentiation) digital controller so as to implement the closed-loop control of the rectified voltage. The invention implements the triggering rectification by frequency self-adaptive digital phase shifting within the working range of low-and-medium-frequency voltage. The invention has the characteristics of high symmetry degree of the output pulse, high anti-interference capability and high response speed, and the synchronous signal conditioning circuit is compact and reliable.
Owner:THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
Probe assembly for a fluid condition monitor and method of making same
InactiveCN1625685AEliminate disturbanceReduce disturbanceLubrication indication devicesMaterial impedanceAutomatic transmissionBiomedical engineering
A probe assembly for real-time monitoring of fluid state in a sensor using impedance spectroscopy, the probe assembly has two closely spaced tubular concentric electrodes. When the pitch is in the range of about 0.15 to 0.55 mm, the surface area of the electrodes is about 8.1 to 10.8 cm2. In one embodiment, a concentric tubular outer Faraday shield is used to monitor fluid within a non-metallic container. This probe assembly is especially useful for monitoring hydraulic fluids, including automatic transmission fluids and mineral-based engine oils used in diesel and gasoline engines.
Owner:EATON CORP
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