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Method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis
InactiveCN101661530AHigh precisionSolve the problem of large measurement errorWind motor combinationsMachines/enginesElectric power systemCorrelation analysis
The invention provides a method for acquiring steady-state equivalent wind speed and generated power in wind power station based on correlation analysis, belonging to the technical field of wind powergeneration. The method comprises the following steps: preprocessing the operational data in the wind power station; acquiring the steady-state equivalent wind speed in the wind power station by a correlation analysis method; forming a wind speed matrix, calculating correlated matrix of all unit wind speed in the wind power station, acquiring a characteristic value and a characteristic vector of the correlated matrix to obtain the equivalent wind speed finally; and acquiring the generated power in the wind power station, and the like. The method can accurately acquire the equivalent wind speedand generated power in the wind power station, and has the characteristics of high precision, simple method, convenient operation, and the like. The method has wide application range, and can be usedfor equivalent modeling of the wind power station, confirmation of the maximum penetration power of the wind power station, technique and system for predicating the generated power in the wind powerstation, reliability and economy application of the wind power station, analysis of influence of a wind power access network to the power system, and the like, and has great application value for planning and designing a wind power station access system.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Velocity detection, position detection and navigation system
InactiveUS20070067137A1High accuracyAccurately obtainPosition fixationAcceleration measurementGravitational accelerationGravitation
As an embodiment of the present invention, in a navigation system using an acceleration sensor, when position information cannot be obtained from a GPS processing section, a velocity detecting unit performs an operation using detected acceleration αG, a measurement time mt, a velocity V0 at a time t0, gravity acceleration g and an amount of height change Dh, according to Expression (11). By using the relationship among a gravity acceleration component gf, the gravity acceleration g, the amount of height change Dh and distance Dm shown in Expression (4), the gravity acceleration component gf can be offset by the amount of height change Dh. Therefore, velocity V can be calculated with high accuracy without receiving the effect of the gravity acceleration component gf.
Owner:SONY CORP
Online hand-eye calibration and grabbing pose calculation method for three-dimensional vision hand-eye system of four-degree-of-freedom parallel robot
ActiveCN110276806ALittle impact on accuracyAccurately obtainProgramme-controlled manipulatorImage enhancementNonlinear distortionHand eye calibration
The invention discloses an online hand-eye calibration and grabbing pose calculation method for a three-dimensional vision hand-eye system of a four-degree-of-freedom parallel robot. The online hand-eye calibration and grabbing pose calculation method comprises the following steps: firstly, constructing an Eye-to-hand eye basic model with a camera fixed outside a robot body, and a three-dimensional vision model based on nonlinear distortion in the hand-eye system; calibrating a pose relation between motions based on a tail end clamping mechanism, and constructing a non-trivial solution constraint of the Eye-to-hand model for removing invalid poses in calibration motion so as to plan a hand-eye calibration motion of the tail end clamping mechanism of the parallel robot; and finally, constructing a parallel robot grabbing module with error compensation by adopting robot motion errors obtained based on hand-eye calibration, and achieving grabbing pose calculation of the tail end clamping mechanism of the parallel robot based on three-dimensional vision and the 4-R (2-SS). According to the online hand-eye calibration and grabbing pose calculation method, the online hand-eye calibration precision and efficiency of the four-degree-of-freedom 4-R (2-SS) parallel robot three-dimensional vision hand-eye system can be effectively improved, and accurate and rapid grabbing of the parallel robot is further facilitated.
Owner:JIANGSU UNIV
Moving state detecting device
ActiveUS20120041702A1Accurately detectAccurately obtainTesting/calibration apparatusNavigation by speed/acceleration measurementsWavelet transformGravitation
To accurately calculate an attached angle of an accelerometer and accurately correct an acceleration that is obtained from the accelerometer: a frequency analyzing module of an acceleration corrector divides a sensor coordinate system acceleration into a bias frequency component, a gravity frequency component, a movement acceleration frequency component, and a noise frequency component, through a wavelet transform. The frequency analyzing module outputs a sum component of the gravity frequency component and the movement acceleration frequency component to an attached angle estimating module and a correcting operation module. The attached angle estimating module estimation-calculates the attached angle of an accelerometer and outputs it to the correcting operation module. The correcting operation module corrects the acceleration, which is including of the sum component of the gravity frequency component and the movement acceleration frequency component, based on the estimation-calculated attached angle to calculate a movable body coordinate system acceleration.
Owner:FURUNO ELECTRIC CO LTD
High-speed moving target position and posture measurement method based on coding structured light
ActiveCN105180904AAccurately obtainQuick fetchPhotogrammetry/videogrammetryProjection planeVisual perception
The invention provides a high-speed moving target position and posture measurement method based on coding structured light, belongs to the technical field of computer vision measurement, and relates to the large-visual-field and small-target high-speed moving target position and posture measurement method. The method includes the steps of projecting a colored grid line containing coding information to a measured area through a colored projector, continuously shooting structured light coding grid line patterns, deformed through moving object surface modulation, through a high-speed camera, achieving corresponding point matching of an imaging plane and a projection plane after digital image decoding to obtain phase position change information, reversely calculating the three-dimensional dynamic morphology of a high-speed moving object through system structure parameters, matching the measured point with a prior model established on the basis of to-be-measured geometrical parameters, and finally accurately measuring position and posture information of the high-speed moving object. The purpose of matching in stereoscopic vision is effectively achieved through a colored stripe pseudorandom sequence and gray scale grid line phase position combined mode. A measurement system is low in cost, simple in mechanism and easy to operate.
Owner:DALIAN UNIV OF TECH
High-velocity motion object pose vision measurement method based on structured light
InactiveCN103727927AHigh energyIncrease brightnessPhotogrammetry/videogrammetryGraphics workstationMotion space
The invention discloses a high-velocity motion object pose vision measurement method based on structured light, belongs to the technical field of computer vision measurement, and relates to a large-view-field small-target high-velocity motion space pose measurement method. The measurement method comprises the following steps: shooting auxiliary crossed laser by left and right high-speed cameras by adopting vertical laser strips and auxiliary crossed laser, recognizing crossed points, and recording the imaging positions of the auxiliary crossed laser at left and right high-speed cameras respectively; and collecting images of a measured cylinder and the vertical laser stripes by utilizing left and right high-speed cameras, transmitting the collected images to a diaphragm workstation, binding and optimizing a target axis by utilizing the distance from the deformation parts of the laser stripes generated by the measured cylinder to the axis, thereby obtaining the position and pose information of the target object finally. According to the invention, the pose information of high-speed motion target objects with high precision without any treatment by utilizing the laser stripes can be obtained, the image collecting quality is improved, and the influence by noisy points is prevented effectively.
Owner:DALIAN UNIV OF TECH
Method for recording version information in embedded software
InactiveCN101042646AAccurately obtainSpecific program execution arrangementsEmbedded softwareAnalysis software
This invention discloses one method to imbed software record edit information, which comprises the following steps: a, defining one edit information whole volume for initiating in software; b, coding the files into executive image file; c, according to file form to analyze the image file to find out the memory position in first step to write the edit information into position; d, converting the corrected file into bin file; e, compressing bin file and compressing the edit file into compression file head; f, decompressing the software edit to get edit information through reading whole volume.
Owner:ZTE CORP
Method and system for setting voltage change rate criterion of direct current line travelling wave protection
ActiveCN105375449ARealize quantitative evaluationEliminate errorsEmergency protective circuit arrangementsSimulationVoltage variation
The invention relates to a method and a system for setting a voltage change rate criterion of direct current line travelling wave protection. The method comprises the following steps: carrying out smoothing reactor valve side metalline earth fault simulation in a simulation model of a direct current transmission system, and obtaining a plurality of first current differential voltage values by sampling direct current bus voltage at each interval of scheduled time, so as to obtain an external fault protection characteristic quantity change boundary; carrying out terminal metalline earth fault simulation in the simulation model, and obtaining a plurality of second current differential voltage values by sampling the direct current bus voltage at each interval of scheduled time, so as to obtain an internal fault protection characteristic quantity change boundary; determining a protection setting value according to the external fault protection characteristic quantity change boundary and the internal fault protection characteristic quantity change boundary. By the method, the change boundaries of the protection characteristic quantity in the internal fault and the external fault can be accurately determined, so that the protection setting value can be accurately determined and quantitative evaluation on the protection performance is achieved.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Method and device for analyzing focusing energy of diffracted waves
ActiveCN106772592AImprove clarityPrecise positioningSeismic signal processingUnderground spaceVector group
The invention provides a method and a device for analyzing focusing energy of diffracted waves. The method comprises the steps of extracting common offset diffracted wave data from acquired seismic common offset data; acquiring angle gather seismic data according to a seismic wave offset velocity file of the seismic common offset data and the common offset diffracted wave data; extracting a diffracted wave target amplitude value from the angle gather seismic data, and enabling the extracted target amplitude value to act as a diffracted wave energy vector in a diffracted wave energy vector group; calculating a variance value of each diffracted wave energy vector in the diffracted wave energy vector group so as to acquire a plurality of variance values; and searching the maximum variance value in the plurality of variance values, and enabling the maximum variance value to act as target focusing energy. According to the method provided by the invention, the focusing energy of the diffracted waves can be solved accurately, diffracted wave focusing and imaging are realized, and a purpose of accurately positioning small-scale heterogeneous geologic bodies in the underground space is achieved. The method relieves a technical problem of poor accuracy when the focusing energy of the diffracted waves is solved in the prior art.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Diagnosis and treatment integrated operation robot system and navigation positioning method thereof
PendingCN109758233AAccurately obtainReduce error rateSurgical needlesSurgical navigation systemsSonificationIntegrated operations
The application discloses a diagnosis and treatment integrated operation robot system and a navigation positioning method thereof. The device comprises a first acquisition module, a second acquisitionmodule, an ultrasonic support, an execution module, a display module, a control module, a mainframe module and an input module, wherein the control module is respectively connected with the first acquisition module, the second acquisition module, the execution module, the mainframe module, the display module and the input module. The first acquisition module and the second acquisition module areinstalled on the ultrasonic support, scan areas to be scanned respectively, and transmit acquired ultrasonic data to the mainframe module through the control module. The mainframe module generates anultrasonic image according to the received ultrasonic data, carries out coordinate positioning on the ultrasonic image, establishes three-dimensional model data of the scanning area, and generates a three-dimensional model image, a puncture path and a path channel. The control module controls the execution module to execute actions according to the path channel selected by the input module.
Owner:上海益超医疗器械有限公司
Shale oil and gas reservoir fracture parameter inversion method based on fracturing fluid flowback data
ActiveCN114169263AAccurately obtainAccurate timingDesign optimisation/simulationMathematical modelFracturing fluid
The invention relates to the technical field of oil and gas field development, and particularly discloses a shale oil and gas reservoir fracture parameter inversion method based on fracturing fluid flowback data, which comprises the following steps: constructing a shale oil and gas reservoir fracture parameter inversion mathematical model and a matrix seepage mathematical model; pseudo-pressure and pseudo-time are introduced, a variable separation method and the Duhamel principle are used for solving the crack parameter inversion mathematical model, and a linear form analytical solution is obtained; solving the matrix seepage mathematical model by using a separation variable method and a Duhamel principle to obtain the matrix-to-crack fluid channeling amount; simultaneously solving the fracture and matrix material balance equation to determine the change relation of the average pressure in the fracture and the matrix along with the time and the change relation of the average saturation along with the time; and performing inversion iteration on the fracture parameters based on the linear form analytical solution, the average pressure and the change relation of the average saturation along with time so as to determine the fracture parameters of the shale oil and gas reservoir. According to the scheme, the fracture parameters of the shale oil and gas reservoir can be accurately and timely solved.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Visual measurement method of high-speed moving object pose based on structured light
InactiveCN103727927BHigh energyIncrease brightnessPhotogrammetry/videogrammetryObject basedVisual perception
Owner:DALIAN UNIV OF TECH
Method and control device and detection device for checking for plausibility of wrong-way driving of motor vehicle
ActiveCN104680798ASimple and reliable error drivingFast and Robust DetectionBeacon systems using radio wavesAnti-collision systemsWrong-way drivingAutomotive engineering
Owner:ROBERT BOSCH GMBH
Stand-by power estimating apparatus and program
ActiveUS20150248153A1Accurately obtainAccurate acquisitionPower network operation systems integrationHardware monitoringPeak valueDuration time
An estimating apparatus includes an acquiring unit, a history recording unit, and a determining unit. The acquiring unit acquires power amounts for respective measurement times from a measuring apparatus that measures power for each branch line, as a plurality of used power amounts. The history recording unit records the plurality of used power amounts in association with dates and times. The determining unit variably sets a comparison value for comparing magnitudes of the plurality of used power amounts recorded in the history recording unit, obtains a minimum value of the comparison value in a range satisfying a condition that an amount of time for which at least some of the plurality of used power amounts are continuously equal to or below the comparison value exceeds a prescribed sustained time, and estimates the minimum value to be a peak value of stand-by power of the branch line.
Owner:PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Transient simulation method of distributed power generation system based on automatic differentiation technology
InactiveCN101937481AAccurately obtainEfficiently obtainSpecial data processing applicationsInformation technology support systemDifferential coefficientMathematical model
The invention discloses a transient simulation method of a distributed power generation system based on an automatic differentiation technology, which comprises the following steps: reading the basic information, topological connection, mathematical model expression and related parameters of a distributed power; stating a corresponding combinational function and independent variable, allocating memory for automatic differentiation and setting stimulation time to be zero; propelling a stimulation step forwardly for the stimulation time; calculating the differential coefficient information and function values of the corresponding combinational function through automatic differentiation; forming a Newton iterative format through combining the whole system equations, updating elements at corresponding positions of column vectors of a Jacobian matrix when iterative solving and the function values through the result obtained from automatic differentiation calculation; solving linear equations to obtain the column vector of variable increment of step k; updating the variable value; judging whether the stimulation time reaches the ceasing moment of stimulation, if yes, releasing the memory to finish stimulation; and otherwise, returning to step three. The method improves the calculation efficiency of programming and simultaneously keeps the maintainability and scalability of codes.
Owner:南京首风智慧电力研究院有限公司
A device for obtaining the width of moiré fringes by using image processing technology
InactiveCN102289779ACalculation speedHigh precisionImage analysisUsing optical meansImaging processingRoot-mean-square deviation
The invention relates to a device for obtaining the width of a Moire fringe by using an image processing technology. The device comprises a device for acquiring an image of the Moire fringe, a device for obtaining the direction of the Moire fringe and a device for calculating the width of the Moire fringe, wherein the device for obtaining the direction of the Moire fringe defines a group of straight lines aj which are intersected into the same point on the image of the Moire fringe, obtains image gray value root mean square errors sigma j in the direction of the straight lines alpha j by using pixel values xij of each point on the image of the Moire fringe at positions where the straight lines aj pass, and uses a straight line au which corresponds to the minimum image gray value root meansquare error sigma u in the sigma j as the direction of the Moire fringe. According to gray values of pixel points on the image of the Moire fringe which is acquired by a computer, the device provided by the invention automatically identifies a direction angle of the Moire fringe, calculates the width of the Moire fringe, is high in calculation speed and high in accuracy, and can be widely applied to the fields of small-angle accurate measurement, photoelectric displacement accurate measurement and the like.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Control method, device and equipment of dopant for mono-crystalline silicon growth and storage medium
PendingCN111005064AControl amountAccurately obtainPolycrystalline material growthBy pulling from meltDopantPhysical chemistry
The invention provides a control method, device and equipment for a dopant for mono-crystalline silicon growth and a storage medium. The method comprises the steps: obtaining a current technological parameter after the preparation of current mono-crystalline silicon is completed, inputting the current technological parameter into a preset model, determining a target volatilization proportion of the dopant; obtaining a theoretical residual amount of the dopant after the preparation of the current mono-crystalline silicon is completed; determining the actual residual amount of the dopant according to the theoretical residual amount and the target volatilization proportion; obtaining the theoretical demand of the dopant for the next single crystal silicon growth, and controlling the actual demand of the dopant for the next single crystal silicon growth according to the actual residual amount of the dopant and the theoretical demand of the dopant for the next single crystal silicon growth.According to the embodiment of the invention, by adopting the preset model, the volatilization proportion of the dopant in the process from the completion of pulling of the current mono-crystalline silicon to the next filling can be accurately obtained, so that the amount of the dopant in the next filling can be better controlled, and the resistivity of the grown next mono-crystalline silicon meets the preset requirement.
Owner:YINCHUAN LONGI SILICON MATERIALS
Photographing apparatus for vehicle and heating device
ActiveUS20190193683A1Accurately obtainAccurate acquisitionTransparent/reflecting heating arrangementsVehicle cleaningStart timeVoltage
A photographing apparatus for vehicle includes a control device which is configured to execute either a first processing or a second processing when a specific condition is satisfied until when a predetermined period of time elapses from start time of the predetermined period of time. The specific condition is satisfied when magnitude of a heat generation amount determination factor deviates from magnitude of the heat generation amount determination factor at the start time of the predetermined period of time by a predetermined value or more. The first processing is a processing to stop applying voltage to heating means until when the predetermined period of time elapses. The second processing is a processing to change a voltage application time based on magnitude of the heat generation amount determination factor at the time when the specific condition is satisfied.
Owner:TOYOTA JIDOSHA KK
Color misregister amount detection method and apparatus for printed report
InactiveUS20080250961A1Accurately obtainAccurate acquisitionCylinder pressesAddressographsColor printingComputer vision
In a printed product color misregister amount detection method, a reference register mark including a first color area portion with a predetermined width and a blank portion in contact with the first color area portion is printed in a reference color on a printed product to be printed by a multi-color printing press. A positional shift detection register mark including a second color area portion with a width smaller than that of the first color area portion of the reference register mark is printed in a color other than the reference color to have as a target position a position where the width of the second color area portion falls within the width of the first color area portion of the reference register mark. Density information representing a density of a color component which is of the same color as that of the positional shift detection register mark within a target range including the first color area portion and the blank portion in contact with the first color area portion of the reference register mark where the positional shift detection register mark has been printed is measured. A positional shift amount between the reference color and the color other than the reference color as a color misregister amount is obtained on the basis of the measured density information.
Owner:KOMORI CORP
Insurance buying method, system and device and storage medium
ActiveCN109727142AImprove insurance experienceGet accurateFinanceCharacter and pattern recognitionUser inputInternet privacy
The invention discloses an insurance buying method, system and equipment and a storage medium. A terminal receives an identity information input request to collect current image information of a userand sends the current image information to a server; The server searches a corresponding insurance buying file according to the received current image information; When the insuring file correspondingto the current image information is not found, personal information corresponding to the current image information is obtained from the public security system; a corresponding to-be-perfected insuring file is generated according to the personal information and the file is sent to the terminal; The terminal receives the insuring information input by the user and fills in the to-be-perfected insuring file and generates a target insuring file, The server obtains the corresponding personal information from the public security system according to the current image information of the user and thengenerates the to-be-perfected insuring file according to the personal information, so that the real personal information of the user can be accurately obtained, the insurance service can be quickly and efficiently handled for the user, and the insuring experience of the user is improved.
Owner:CHINA PING AN PROPERTY INSURANCE CO LTD
Permanent magnet synchronous motor maximum efficiency torque ratio control method and permanent magnet synchronous motor maximum efficiency torque ratio controller
ActiveCN109831138AAccurately obtainWeakened Voltage ConstraintsElectronic commutation motor controlVector control systemsOperating pointPermanent magnet synchronous motor
The invention relates to a permanent magnet synchronous motor maximum efficiency torque ratio control method and permanent magnet synchronous motor maximum efficiency torque ratio controller. The method comprises steps of S1, according to the given target torque of the permanent magnet synchronous motor, using an MTPA curve to iteratively obtain the stator d-axis current under the minimum currentoperating point corresponding to the target torque; S2, according to a motor constraint condition, establishing a permanent magnet synchronous motor operating point selection model; and S3, accordingto the target torque of the permanent magnet synchronous motor, the current voltage limiting ellipse and current limiting circle of the permanent magnet synchronous motor, obtaining a new operating point based on the permanent magnet synchronous motor operating point selection model. Compared with a linearization method, the method greatly weakens the voltage constraint condition and obtains better dynamic response, can accurately obtain the intersection of the MTPA curve and the current limiting curve or voltage limiting curve to avoid torque instability or even oscillation caused by a calculation error.
Owner:HUNAN UNIV
Projection mapping method and device
PendingCN112614190AEasy to useSimplify the operation processImage enhancementImage analysisPhysicsProjection image
The invention provides a projection mapping method and device. The projection mapping method is applied to control equipment in the projection mapping control system, and the control system further comprises a camera and a projector. The method comprises the following steps: acquiring a grating image, wherein the grating image is an image which is collected by a camera and contains a grating pattern projected by a projector on a to-be-projected object; obtaining a parallax image of the projector based on the grating image; obtaining a discrete color image, wherein the discrete color image is an image obtained after the grating image is transformed, and the discrete color image comprises a hole area; repairing the hole area based on the parallax image to obtain a first repaired image; generating a projection image based on the first restored image and the parallax image; and controlling a projector to project the projection image on a to-be-projected object. The method is used for simplifying the operation process of projection mapping and improving the practicability.
Owner:BEIJING TRICOLOR TECH
Tracking and computing method of Thevenin equivalent of full-dynamic process power system
ActiveCN102693358ASolve problemsFind out exactlyData processing applicationsSpecial data processing applicationsSystem failurePower-system automation
The invention relates to a tracking and computing method of Thevenin equivalent of a full-dynamic process power system and belongs to the field of power system automation. In order to solve the problem that the traditional computing method of Thevenin equivalent can only compute equivalent parameters of steady-state process of the power system, and cannot compute equivalent parameters of the power system during the failure of the power system and transient process after the failure is solved. The method comprises the following steps of: using the equivalent parameters before failure to compute amplitude of equivalent voltage source when the failure occurs; taking the resistive component of the equivalent system impedance before failure and equivalent voltage source amplitude when the failure occurs as original values, computing other Thevenin equivalent parameters when the failure occurs; and finally, using the method to compute equivalent parameters of the power system when the failure is removed so as to obtain Thevenin equivalent parameters of the power system at each time after the failure is removed. The method can compute equivalent parameters during the full-dynamic transient state and medium and long-term process of the power system, and has small computing error.
Owner:CHINA ELECTRIC POWER RES INST +1
Method for recording version information in embedded software
InactiveCN100462916CAccurately obtainSpecific program execution arrangementsEmbedded softwareAnalysis software
Owner:ZTE CORP
Shock absorber
InactiveUS20190105958A1Accurately obtainObtaining axial positionSpringsAxle suspensionsEngineeringSuspension spring
A shock absorber includes a suspension spring configured to bias the shock absorber main body in an extension direction; a spring bearing that supports one end of the suspension spring; a jack configured to change an axial position of the spring bearing; an adapter rotatably mounted on the spring bearing, the adapter being restricted to move in an axial direction with respect to the spring bearing; a rotation stop member mounted on the shock absorber main body to stop a rotation of the adapter; and a stroke sensor disposed between the adapter and the rotation stop member.
Owner:KYB CORP
Method for the automated calibration of a printing machine
ActiveCN109955607AReveal errors immediatelyHigh image resolutionPower drive mechanismsOther printing apparatusImage detectionDigital image
A method for the automated calibration of a printing machine with an image capture system by using a computer, includes putting at least one printed sample substrate with defined deviations into the printing machine, generating a digital image of the printed sample substrate by using the image capture system, calculating current compensation values including defined deviations for configuration parameters of the printing machine relating to optimizing the printing quality by using the computer, and comparing the current compensation values created with target compensation values known from thedefined deviations of the printed sample substrate. Serviceability of the printing machine is checked by evaluating the comparison by the computer and / or calibrating the printing machine by using theevaluated comparison by the computer.
Owner:HEIDELBERGER DRUCKMASCHINEN AG
Gas sensor
ActiveUS20190285575A1Accurately obtainAccurately measureMaterial electrochemical variablesInterior spaceEngineering
A sensor element includes: a main pump cell constituted by an inner pump electrode facing a first inner space into which a measurement gas is introduced, an external pump electrode provided on an element surface, and a solid electrolyte located therebetween; and a measurement pump cell constituted by the measurement electrode facing a second inner space which is communicated with the first inner space and functioning as a reduction catalyst for NOx, and a solid electrolyte located therebetween. The inner pump electrode has a planar shape in which two parts of a front end part relatively having a large area and a rear end part relatively having a small area are sequentially connected in this order from an upstream side in a longitudinal direction of the sensor element while satisfying requirements of a predetermined size and area.
Owner:NGK INSULATORS LTD
Method and device for determining the circumference of a tyre fitted on a vehicle
Owner:ROBERT BOSCH GMBH
Controller for air conditioner
PendingUS20220307721A1Accurately obtainImprove accuracyMechanical apparatusLighting and heating apparatusEngineeringTemperature control
A controller according to an embodiment of the present disclosure is a controller for an air conditioner that performs air-conditioning according to room temperature, the controller comprises: a housing; a heat source temperature sensor disposed inside the housing, the heat source temperature sensor being configured to measure a temperature of a heat source that generates heat during operation as a heat source temperature; an internal temperature sensor disposed inside the housing at a position away from the heat source, the internal temperature sensor being configured to measure a temperature inside the housing as an internal temperature; and a control unit that determines the room temperature using a temperature difference between the measured heat source temperature and the measured internal temperature.
Owner:DENSO WAVE INC
A dynamic performance determination method suitable for multistage centrifugal pump smooth mouth ring
ActiveCN103629120BAccurately obtainSave computing resourcesMachine part testingPump controlMomentumOrder form
The invention provides a dynamics performance determination method applicable to the smooth choma of a multistage centrifugal pump; the dynamics performance determination method is based on a short sealing theory and a finite length theory, and comprises the following steps that (1) the structural parameters of the choma of a high-pressure multi-stage centrifugal pump impeller are determined by a length measuring tool, and the operation conditions of the centrifugal pump are determined; (2) a control equation group which comprises a continuity equation, a circumferential momentum equation and an axial momentum equation is established; (3) the control equation group is simplified in a dimensionless way, and a differential equation group of an original equation group about the first and zero order forms of perturbation is worked out through a perturbation method; (4) the dimensionless differential equation after simplification is solved through a shooting method, and the dynamic characteristic coefficient of the choma of the high-pressure multi-stage centrifugal pump is finally determined. The dynamics performance determination method applicable to the smooth choma of the multistage centrifugal pump is used for determining the dynamics performance of the choma of the high-pressure multi-stage centrifugal pump, has a wider scope of application, and has more accurate calculation results.
Owner:CHINA HUANQIU CONTRACTING & ENG CO LTD +1
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