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Current full compensation method and system based on single-phase earth fault
PendingCN108448562AEasy to measureNo complex calculations requiredCurrent measurements onlyEmergency protective arrangements for limiting excess voltage/currentHigh resistanceCompensation effect
The invention provides a current full compensation method and a system based on single-phase earth fault. When zero sequence voltage is not in a preset voltage value range, namely, the happened single-phase earth fault is instant ground connection, an arc extinction coil device with high flexibility in high-resistance ground connection can compensate ground connection capacitive current. When thezero sequence voltage is in the preset voltage value range, namely, the happened single-phase earth fault is not instant ground connection, a breaker in a fault phase transfer ground connection deviceconnected with a fault phase is turned off, fault current is converted into earth current, and a compensable compensation device is further utilized to output full compensation fault residual current. The fault current is converted into the earth current, the earth current can serve as tracking compensation signals of the compensable compensation device, and judgment reference is provided for a compensation effect of the compensable compensation device. In addition, the earth current can be determined by measurement; furthermore, measurement is convenient, and complex calculation is avoided;thus, compensation quickness and accuracy are ensured, compensation precision is improved, and fault points are shielded.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Equivalent model method for performing electromagnetic transient simulation on alternating current/direct current hybrid power grid
InactiveCN103605829AAccurate researchAnalyze impactSoftware simulation/interpretation/emulationSpecial data processing applicationsElectricityEngineering
The invention provides an equivalent model method for performing electromagnetic transient simulation on an alternating current / direct current hybrid power grid. The method comprises the steps of (1) confirming an initial network, an internal network and an external network; (2) confirming an external equivalent network; (3) performing matrix calculation; (4) screening elements in node impedance matrixes; (5) modeling and checking the external equivalent network; (6) modeling and checking the internal network except the portion outside the direct current portion; (7) modeling and checking the direct current portion of the internal network. A direct current transmission line is completely retained, accurate research on performance of a relay protection device in the alternating current / direct current hybrid power grid is facilitated, and the influence of a direct current network to the relay protection device, the influence of an alternating current network to the relay protection device and mutual effects of the direct current network and the alternating current network under the breakdown condition in the alternating current / direct current hybrid power grid can be comprehensively analyzed.
Owner:HUAZHONG UNIV OF SCI & TECH +3
Method and system for remote locating on basis of at least four magnetic field sensor array planes
InactiveCN102743175APrecise positioningLow costDiagnostic recording/measuringSensorsSensor arrayField intensity
The invention provides a method and a system for remote locating on basis of at least four magnetic field sensor array planes, wherein the system comprises a location object, magnetic sensor arrays, magnetic field spatial analytical equipment and background magnetic field compensation sensors, and the location object needs to have a magnetic field, such as a capsule or a probe which contains a permanent magnet; and the magnetic sensor arrays comprise four or more than four non-fixed magnetic field sensor array planes, a Hall sensor and a magnetorsistive sensor. According to the method and the system for remote locating on the basis of at least four magnetic field sensor array planes, the target area is located among the four or more than four magnetic field sensor array planes, the strongest field intensity points of all the planes are found out, and through utilizing the solid geometry knowledge and combining with the magnetic field compensation information, the object can be remotely located.
Owner:安翰科技(武汉)股份有限公司
Turn-on angle control method for switched reluctance motor
ActiveCN101860302ASimple algorithmVersatility and adaptabilityCurrent controllersElectronic commutatorsProgrammable logic deviceControl mode
The invention discloses a turn-on angle control method for a switched reluctance motor, belonging to the technical field of angle control of switched reluctance motors. The invention provides an optimized control method for a turn-on angle based on characteristics of the switched reluctance motor. The method is realized by a position detection unit: a position level signal is generated by the position detection unit and then is encoded by a programmable logic device; and by using a microprocessor, actual rotate speed of the motor is calculated based on the position code, target current value required to conducting a phase winding by the switched reluctance motor is calculated by a PI algorithm, and angle position control is realized based on the target current value, an actual sampling current value and the actual rotate speed value by a special algorithm. The invention can realize automatic setting of the turn-on angle of the switched reluctance motor, improve control flexibility of the switched reluctance motor and simplify design of control program.
Owner:SHANDONG KEHUI POWER AUTOMATION
Teaching robot and operating method thereof
InactiveCN105881518AFast teaching speedHigh speedProgramme-controlled manipulatorClutch controlControl system
The invention belongs to the technical field of industrial automation and relates to a teaching robot and an operating method thereof. The robot comprises a motor, a clutch connected with the motor and driven by the motor, a first robotic arm driven by the clutch, a control system for controlling the motor to be started and stopped, and a sensor connected with the control system and used for acquiring the rotational angle of the first robotic arm. The clutch controls the motor whether to drive the first robotic arm to rotate or not, and the control system represents the moving trajectory of the first robotic arm not driven by the motor according to signals of the sensor. The robot has the advantages that robot teaching operation is simple and rapid, the teaching mode is more visual, and the requirement for the educational background level of an operator is low; as a teaching control handle or a force sensor is not needed, compared with other teaching methods, cost is low, no induction force or corresponding processing programs are needed, and system control and operation are more reliable.
Owner:LIUZHOU OUKA ROBOT CO LTD
Multistage thermoelectric cooler parameter vacuum testing device
ActiveCN103257052AAvoid the problem of easy condensationComprehensive test parametersStructural/machines measurementThermoelectric coolingEngineering
The invention discloses a multistage thermoelectric cooler parameter vacuum testing device which comprises a vacuum cavity, a vacuum pump, a water-cooling head, a temperature control cooling water circulation device, a heating resistor module, a cold-end temperature measurement resistor, a hot-end temperature measurement resistor, a direct current power source, and a data processing and displaying module. A vacuum pumping valve and an air vent valve are arranged on the vacuum cavity. The vacuum cavity is sealed with the water-cooling head through a vacuum rubber ring and connecting screws. A hot end of a thermoelectric cooler achieves heat dissipation and temperature control through the water-cooling head and the temperature control cooling water circulation device. The data processing and displaying module is used for carrying out real-time control, data processing and result displaying on appliances in the device. Through adoption of the multistage thermoelectric cooler parameter vacuum testing device, the current-voltage response relation and the current-refrigerating capacity relation of the multistage thermoelectric cooler, the refrigerating efficiency of the multistage thermoelectric cooler under different heat dissipation conditions and other parameters can be obtained. The multistage thermoelectric cooler parameter vacuum testing device is simple in structure, convenient to operate, high in measuring accuracy, and capable of effectively preventing a cold end of the thermoelectric cooler from dewing in the testing process of large temperature difference.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Automatic clutch for car driving mechanism based on helicoid spring compensation
The invention relates to an automobile automatic clutch driving mechanism based on a volute compensation spring. Produced automatic clutch control systems are not formed in our country at the moment. The automatic clutch driving mechanism is an important component part of the automatic clutch control system. The automobile automatic clutch driving mechanism comprises a direct current driving motor arranged on a bracket and a self-locking worm and gear retarding mechanism connected with the clutch driving mechanism. A center driving shaft (13) arranged in a cylindrical steel barrel is connected with a worm wheel of the self-locking worm and gear retarding mechanism. The center driving shaft is respectively connected with a driving disc (1) and the inner end of a volute compensating spring (5). The driving disc is connected with a clutch inhaul cable (2). The outer end of the volute compensating spring is connected with a cylinder (11). The volute compensating spring is pre-tightened in advance before being arranged. The cylinder is internally provided with a mechanical position-limit mechanism (4), the volute compensating spring and a side angular position sensor (6). The automobile automatic clutch driving mechanism is applied to the automobile automatic control field.
Owner:HARBIN UNIV OF SCI & TECH
Matcap map-based role rendering method, device and equipment
PendingCN110363836AMeet requirements that require the use of multiple rendering informationSatisfy the requirement to use multiple rendering information3D-image renderingComputer graphics (images)Complex calculation
The invention discloses a Matcap map-based role rendering method, a device and equipment, and relates to the technical field of game software. The method comprises the following steps of: manufacturing a plurality of Matcap maps; each Matcap map is enabled to contain one kind of rendering information, so that each Matcap map contains one kind of rendering information; therefore, one kind of rendering information is expanded into multiple kinds of rendering information; arranging and combining all the Matcap chartlets into one chartlet, so as to obtain a plurality of chartlets; and the combinedmap sampling coordinates are used to render various rendering information in sequence, so that the requirement that various rendering information needs to be used in a role rendering process is met,finally, role rendering is similar to a result based on physical rendering, and a real high-quality role is rendered. Moreover, the high-quality role rendering is realized through a plurality of Matcap maps, and complex calculation is not needed, so that the method has high efficiency.
Owner:杭州绝地科技股份有限公司
Indoor positioning system and positioning method based on characteristic light source and spherical lighting device
The invention relates to the field of indoor positioning, in particular to a high-precision indoor positioning system based on a characteristic light source and a spherical lighting device and a corresponding method. The positioning described is three-dimensional space positioning. The system of the present invention includes three components: a characteristic light source, a spherical lighting device and a processor. The method of the present invention includes five steps of light source arrangement, information entry, site-selective lighting, feature matching and position calculation. Compared with the traditional indoor positioning system, the indoor positioning technology provided by the present invention has high precision, low cost, good real-time performance, and excellent scalability and portability.
Owner:ZHEJIANG UNIV
Air conditioner, variable-frequency speed regulation system and control method thereof
InactiveCN104348393AGood energy saving effectGood speed regulation performanceElectronic commutation motor controlVector control systemsPower flowThree-phase
The invention discloses an air conditioner, a variable-frequency speed regulation system and a control method thereof. The control method includes the steps of: detecting a three-phase current of a motor; estimating the position and the speed of a rotor of the motor to obtain an estimated angle and an estimated speed of the rotor; according to an input ramp signal, performing position correction on the estimated angle to obtain a given speed, performing differential calculation on the ramp signal, and superposing a calculation result to the given speed to obtain a target speed; according to the target speed, performing speed correction on the estimated speed to obtain a quadrature axis target current; and performing coordinate transformation on the three-phase current to obtain a direct axis current and a quadrature axis current, performing current correction on the direct axis current Id and the quadrature axis current Iq according to the direct axis target current and the quadrature axis current Iqref to obtain a direct axis voltage Vd and a quadrature axis voltage Vq, and controlling the motor according to the direct axis voltage Vd and the quadrature axis voltage Vq. The control method provided by the invention can improve speed regulation performance, and improve an energy-saving effect.
Owner:GD MIDEA AIR-CONDITIONING EQUIP CO LTD
Method for measuring moisture content of sandstone based on interdigital capacitor
The invention discloses a method for measuring the moisture content of sandstone based on an interdigital capacitor. The method is rapid in detection, high in measurement precision, accurate in measurement data and low in cost. The method comprises the following steps: S1, respectively putting a plurality of groups of standard sandstone samples with different preset moisture contents into a capacitance device and taking the standard sandstone samples as a capacitance medium, and sequentially measuring capacitance values of the capacitance device corresponding to the standard sandstone samples with different moisture contents; S2, establishing a mathematical model of the capacitance value and the moisture content according to the capacitance value measured in the step S1, and obtaining a relational expression of the capacitance value and the moisture content; S3, putting the to-be-measured sandstone into the capacitance device to serve as a capacitance medium, and measuring the capacitance value of the capacitance device corresponding to the to-be-measured sandstone; and S4, substituting the capacitance value measured in the step S3 into the relational expression of the capacitance value and the water content to calculate the water content of the sandstone to be measured. The method is suitable for measuring the water content of the sandstone.
Owner:ZHONGSHAN AISHANGZHITONG INFORMATION TECH CO LTD
Image acquisition device and image acquisition device-based facial identity verification method
ActiveCN108875472ALow costImprove accuracyTelevision system detailsColor television detailsCamera lensFacial identity
The invention discloses an image acquisition device and an image acquisition device-based facial identity verification method. The image acquisition device comprises a lens, a light splitting component, an infrared image sensor and a visible image sensor, wherein the lens is used for obtaining an imaging light ray; the light splitting component is arranged behind the lens and is used for splittingthe light ray from the lens into a first beam of light ray and a second beam of light ray; the infrared image sensor is used for forming an infrared image on the basis of the first beam of light rayfrom the light splitting component; the visible image sensor is used for forming a visible image on the basis of the second beam of light ray from the light splitting component; and the infrared imagesensor and the visible image sensor are arranged behind the light splitting component in parallel and relatively fixed in the aspect of position. According to the image acquisition device, the process of judging whether the infrared image and the visible image belong to a same person is omitted. The facial identity verification method has similar advantages.
Owner:BEIJING KUANGSHI TECH +1
SAR (Synthetic Aperture Radar) image overlay area positioning method based on spatial geometric ratio relation
PendingCN114463417AQuick buildNo complex calculations requiredImage enhancementImage analysisMinimum bounding rectangleAngle of incidence
The invention relates to an SAR image overlay area positioning method based on a space geometry ratio relation. The method comprises the following steps: firstly, acquiring SAR data and DEM data of a corresponding region; acquiring an image incident angle according to an xml file attached to the SAR image; reading an RPC parameter file, and constructing a rational function model RFM of the satellite-borne SAR image; geodetic coordinates corresponding to the coordinates of the image points at the four corners of the SAR image are determined, and a minimum enclosing rectangle formed by the geodetic coordinates is obtained; cutting the DEM data according to the minimum bounding rectangle, and re-sampling the DEM data; determining a ratio relation threshold value of the number of the object space pixels and the number of the image space pixels when overlay occurs; on the basis of object space partitioning of the resampling DEM data, a mask of each object space sub-block is calculated in a multi-thread parallel mode, and the masks are combined and subjected to post-processing to generate a final overlay mask. The method provided by the invention can be used for quickly generating the SAR overlay mask, and provides technical guarantee for further application of SAR images.
Owner:WUHAN UNIV
Equivalent Modeling Method for Electromagnetic Transient Simulation of AC/DC Hybrid Power Grid
InactiveCN103605829BAccurate researchAnalyze impactSoftware simulation/interpretation/emulationSpecial data processing applicationsElectricitySimulation
The invention provides an equivalent model method for performing electromagnetic transient simulation on an alternating current / direct current hybrid power grid. The method comprises the steps of (1) confirming an initial network, an internal network and an external network; (2) confirming an external equivalent network; (3) performing matrix calculation; (4) screening elements in node impedance matrixes; (5) modeling and checking the external equivalent network; (6) modeling and checking the internal network except the portion outside the direct current portion; (7) modeling and checking the direct current portion of the internal network. A direct current transmission line is completely retained, accurate research on performance of a relay protection device in the alternating current / direct current hybrid power grid is facilitated, and the influence of a direct current network to the relay protection device, the influence of an alternating current network to the relay protection device and mutual effects of the direct current network and the alternating current network under the breakdown condition in the alternating current / direct current hybrid power grid can be comprehensively analyzed.
Owner:HUAZHONG UNIV OF SCI & TECH +3
Electrostatic sensor
ActiveCN105807971AEasy to operateSimple methodInput/output processes for data processingElectricityElectrical resistance and conductance
The invention relates to an electrostatic sensor, which comprises a sensing unit and a control unit, wherein the sensing unit comprises at least one first sensing element and at least two first electrodes; the at least two first electrodes are arranged at the two ends of the at least one first sensing element and are electrically connected with the at least one first sensing element; the at least one first sensing element is of a one-dimensional semiconductor nanostructure with the diameter being smaller than 100 nanometers; when an object with static electricity approaches to the first sensing element, the resistance of the first sensing element changes; the control unit is electrically connected with the at least one first sensing element through a conducting wire; after the voltage is applied to the at least one first sensing element, the resistance of the at least one first sensing element is measured; and a resistance signal is output.
Owner:TSINGHUA UNIV +1
Power transmission line sag measurement method based on unmanned aerial vehicle laser point cloud model
PendingCN114396878AEasy to measureHigh precisionUsing optical meansLaser scanningReal-time computing
The invention discloses a power transmission line sag measurement method based on an unmanned aerial vehicle laser point cloud model. The method comprises the following steps that two cable towers needing to be measured are determined; performing three-dimensional laser scanning on the two towers and the power transmission line between the two towers by using an unmanned aerial vehicle carrying a three-dimensional laser point cloud scanner to obtain corresponding point cloud data; performing three-dimensional reconstruction by using the point cloud data to obtain a power transmission line model; importing the power transmission line model into a geometric drawing board for analysis, taking a hanging point of a tower at one end as an original point, establishing a coordinate system, measuring an abscissa of another upper hanging point, selecting a span midpoint, and measuring the size of a sag; the horizontal span L, the length D of the horizontal and vertical coordinates of the hanging points of the two towers and the sag length H on the geometric drawing board can be measured from the geometric drawing board, and the actual sag length f is equal to L * H / D. The method has the advantages that sag measurement accuracy is improved, measurement is convenient, complex calculation is not needed, and the intelligent level of a power transmission line is improved.
Owner:STATE GRID CORP OF CHINA +2
Turn-on angle control method for switched reluctance motor
ActiveCN101860302BVersatilityNo complex calculations requiredCurrent controllersElectronic commutatorsLocation detectionControl manner
The invention discloses a turn-on angle control method for a switched reluctance motor, belonging to the technical field of angle control of switched reluctance motors. The invention provides an optimized control method for a turn-on angle based on characteristics of the switched reluctance motor. The method is realized by a position detection unit: a position level signal is generated by the position detection unit and then is encoded by a programmable logic device; and by using a microprocessor, actual rotate speed of the motor is calculated based on the position code, target current value required to conducting a phase winding by the switched reluctance motor is calculated by a PI algorithm, and angle position control is realized based on the target current value, an actual sampling current value and the actual rotate speed value by a special algorithm. The invention can realize automatic setting of the turn-on angle of the switched reluctance motor, improve control flexibility of the switched reluctance motor and simplify design of control program.
Owner:SHANDONG KEHUI POWER AUTOMATION
Electrostatic sensor
ActiveCN105807973BEasy to operateSimple methodElectronic switchingInput/output processes for data processingElectricityCarbon nanotube
The invention relates to an electrostatic sensor, which includes a sensing unit and a control unit. The sensing unit includes at least one first sensing element, and at least two first electrodes are arranged on the at least one first sensing element. Both ends are electrically connected to the at least one first sensing element. The at least one first sensing element is a one-dimensional semiconductor nanostructure. The absolute change in conductivity of the one-dimensional semiconductor nanostructure is related to the steepness of the Fermi surface position movement. The value is approximately greater than 10-3. When an object with static electricity approaches the first sensing element, the resistance of the first sensing element changes; the control single is electrically connected to the at least one first sensing element through a wire. , and by applying a voltage to the at least one first sensing element, the resistance of the at least one first sensing element is measured and a signal of the resistance is output.
Owner:TSINGHUA UNIV +1
Image acquisition device and face identity verification method based on the image acquisition device
ActiveCN108875472BLow costImprove accuracyTelevision system detailsColor television detailsLight beamMaterials science
The invention discloses an image acquisition device and a face identity verification method based on the image acquisition device. The image acquisition device includes: a lens, the lens is used to obtain imaging light; After the lens, it is used to divide the light entering through the lens into a first light beam and a second light beam; an infrared image sensor, the infrared image sensor forms an infrared light based on the first light beam incident through the light splitting component image; a visible light image sensor, the visible light image forms a visible light image based on the second beam of light incident through the light splitting component; wherein, the infrared image sensor and the visible light image sensor are arranged in parallel behind the light splitting component and The relative position is fixed. The image acquisition device can save the process of judging whether the infrared image and the visible light image are the same person. This face authentication method has similar advantages.
Owner:BEIJING KUANGSHI TECH CO LTD +1
Indoor positioning system and positioning method based on characteristic light source and small hole lighting device
ActiveCN105824009BHigh precisionEasy to deployPosition fixationSpatial positioningPositioning technology
Owner:ZHEJIANG UNIV
Electrostatic sensor
ActiveCN105807971BEasy to operateSimple methodInput/output processes for data processingElectrical resistance and conductanceEngineering
An electrostatic sensing device comprises an electrostatic sensing module and a control unit electrically connected to the electrostatic sensing module. The electrostatic sensing module comprises a first electrostatic sensing element comprising opposite ends, and two first electrodes. The two first electrodes are separately located on and electrically connected to the two opposite ends of the first electrostatic sensing element. The first electrostatic sensing element is one-dimensional semiconducting linear structure with a diameter less than 100 nanometers. The control unit electrically is configured to apply a direct voltage to the first electrostatic sensing element and measure a current / resistance of the first electrostatic sensing element.
Owner:TSINGHUA UNIV +1
Strip type working face filling mining method
ActiveCN114165234AAvoid distractionTimely dilutionUnderground miningSurface miningEngineeringStructural engineering
The embodiment of the invention provides a broken-line-shaped ventilation strip type working face filling mining method which comprises the following steps that (1) a transportation crossheading, an air return crossheading and an open-off cut are excavated to form a working face to be mined and a U-shaped ventilation channel, the working face to be mined comprises N mining areas, and N is an integer larger than or equal to 2; 2) tunneling the first mining area according to a strip type coal mining method and forming a first unfilled strip, a first coal pillar, a second unfilled strip, a second coal pillar and a first communication channel; (3) the conveying gate road, the cut hole, one part of the air return gate road, the first unfilled strip, the first communication channel, the second unfilled strip and the other part of the air return gate road are sequentially connected so as to form a ventilation channel; and 4) repeating the step 2) to the step 3) to form a new ventilation channel.Therefore, the strip type working face filling mining method has the advantages of high safety, simple and convenient equipment and convenience in operation.
Owner:中煤科工能源科技发展有限公司
Automatic clutch driving mechanism for car based on helicoid spring compensation
Owner:HARBIN UNIV OF SCI & TECH
Indoor positioning system and positioning method based on characteristic light source and spherical lighting device
The present invention relates to the field of indoor positioning and particularly relates to a high precision indoor positioning system and corresponding method based on a characteristic light source and a spherical lighting device. The positioning is three-dimensional spatial positioning. The system comprises the characteristic light source, the spherical lighting device and a processor. The method comprises the steps of light source arrangement, information inputting, position selection and lighting, characteristic matching, and position calculation. Compared with a traditional indoor positioning system, the indoor positioning technology provided by the invention has the advantages of high accuracy, low cost, good real-time performance, and excellent scalability and portability.
Owner:ZHEJIANG UNIV
An indoor positioning system and positioning method for multiple characteristic light sources
ActiveCN105824008BHigh precisionEasy to deployPosition fixationSpatial positioningPositioning technology
The present invention relates to the field of indoor positioning and particularly relates to an indoor positioning system and positioning method for multiple characteristic light sources. The positioning is three-dimensional spatial positioning. The system of the invention comprises a light collection device, a communication module, and a processor. The method of the invention comprises the steps of device arrangement, information recording, signal collection, and position calculation. Compared with a traditional indoor positioning system, the indoor positioning technology provided by the invention has the advantages of high accuracy, low cost, and good real-time performance.
Owner:ZHEJIANG UNIV
Static Sensing Method
ActiveCN105808031BEasy to operateSimple methodInput/output processes for data processingElectrical resistance and conductanceEngineering
An electrostatic sensing method is provided. An electrostatic sensing device comprising an electrostatic sensing module comprising a first electrostatic sensing element, and a control unit electrically connected to the electrostatic sensing module is provided. The first electrostatic sensing element is one-dimensional semiconducting linear structure. A direct voltage is applied to the first electrostatic sensing element. A sensed object with electrostatic charge is moved to the electrostatic sensing device in a distance near but not touching the first electrostatic sensing element. A resistance changed value of the first electrostatic sensing element is measured.
Owner:TSINGHUA UNIV +1
Electrostatic sensor
ActiveCN105807973AEasy to operateSimple methodElectronic switchingInput/output processes for data processingElectrical resistance and conductanceFermi surface
The invention relates to an electrostatic sensor. The electrostatic sensor comprises a sensing unit and a control unit, wherein the sensing unit comprises at least one first sensing element and at least two first electrodes arranged at two ends of at least one first sensing element and electrically connected with at least one first sensing element; at least one sensing element adopts a one-dimensional semiconductor nanostructure; an absolute value of a steep rate of the movement of a Fermi surface under the conductivity change of the one-dimensional semiconductor nanostructure is about greater than 10<-3>; when an object with static electricity gets close to the first sensing element, the resistance of the first sensing element is changed; and the control unit is electrically connected with at least one first sensing element through a lead wire, measures the resistance of at least one sensing element through applying a voltage to at least one first sensing element, and outputs a resistance signal.
Owner:TSINGHUA UNIV +1
A multi-stage thermoelectric cooler parameter vacuum testing device
ActiveCN103257052BAvoid the problem of easy condensationComprehensive test parametersStructural/machines measurementEngineeringWater circulation
The invention discloses a multistage thermoelectric cooler parameter vacuum testing device which comprises a vacuum cavity, a vacuum pump, a water-cooling head, a temperature control cooling water circulation device, a heating resistor module, a cold-end temperature measurement resistor, a hot-end temperature measurement resistor, a direct current power source, and a data processing and displaying module. A vacuum pumping valve and an air vent valve are arranged on the vacuum cavity. The vacuum cavity is sealed with the water-cooling head through a vacuum rubber ring and connecting screws. A hot end of a thermoelectric cooler achieves heat dissipation and temperature control through the water-cooling head and the temperature control cooling water circulation device. The data processing and displaying module is used for carrying out real-time control, data processing and result displaying on appliances in the device. Through adoption of the multistage thermoelectric cooler parameter vacuum testing device, the current-voltage response relation and the current-refrigerating capacity relation of the multistage thermoelectric cooler, the refrigerating efficiency of the multistage thermoelectric cooler under different heat dissipation conditions and other parameters can be obtained. The multistage thermoelectric cooler parameter vacuum testing device is simple in structure, convenient to operate, high in measuring accuracy, and capable of effectively preventing a cold end of the thermoelectric cooler from dewing in the testing process of large temperature difference.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Accurate pipeline elbow stress calculation method
ActiveCN112329317ARelatively small errorEfficient and Accurate AcquisitionDesign optimisation/simulationSpecial data processing applicationsClassical mechanicsEngineering
The invention discloses an accurate pipeline elbow stress calculation method. The method comprises the steps: 1, calculating an elbow stress increase coefficient under the influence of pipeline displacement; 2, calculating an elbow stress increase coefficient iF under the influence of an external load; 3, synthesizing the two parts of stress increase coefficients to obtain a total stress increasecoefficient i1; and 4, calculating the accurate stress at the elbow; According to the method, the stress of the pipeline elbow can be efficiently and accurately calculated, so that the stress analysisresult of the elbow is more accurate and reliable. The introduction of the accurate stress increase coefficient can effectively reduce the error between the calculated value and the true value of thestress of the pipeline elbow, thereby improving the credibility of the strength and fatigue analysis result.
Owner:XI AN JIAOTONG UNIV
A single-ended traveling wave fault location method
ActiveCN104793102BEasy to operateRealize direct identificationFault locationData acquisitionReflected waves
A single-ended traveling wave fault location method, which uses electrical components that can change the characteristics of the traveling wave waveform at the opposite end bus to change the characteristics of the reflected wave waveform of the opposite end bus, making it significantly different from other traveling wave waveforms ; When the reflected wave is passed back to the reference end, the traveling wave acquisition and processing device at the reference end will record the waveform, because there is a significant difference between the reflected wave waveform of the opposite end bus and other waveforms, it can be directly obtained from multiple Find the reflected wave of the opposite-end bus in the waveform; bring the time data corresponding to the first wave and the reflected wave of the opposite-end bus into the corresponding ranging formula, and the ranging can be completed. A single-end traveling wave fault location method of the present invention adopts the method of marking the reflected wave of the opposite end, and directly identifies the reflected wave of the bus at the opposite end from the numerous wave head information at the traveling wave acquisition and processing device end, and uses the wave head information The distance measurement is completed, and the operation is simple and convenient. It does not require complicated calculation and transformation, and can be used independently.
Owner:湖北泽丰电力设计有限公司
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