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Transformer diagnosis system and diagnosis method
InactiveCN103472350ADoes not affect normal operationDoes not damage the structureSubsonic/sonic/ultrasonic wave measurementElectrical testingTransformerEngineering
The invention discloses a transformer diagnosis system which comprises a transformer, a sensor, an analog filter module, a power supply module, an RS232 transceiving module, a PC upper computer, a sampling control module, a battery and a DC-DC circuit. According to the invention, acoustic features generated during transformer failure detection in a frequency range of 20Hz-10kHz are compared to diagnose the operation state of a transformer; and the magnetically mounted vibration or acoustic sensor clings to the surface of the transformer to perform signal monitoring, is high in signal to noise ratio and convenient to mount, is less influenced by external interference, does not influence normal operation of the transformer and does not cause damage to the transformer structure. The invention also discloses a transformer diagnosis method using the transformer diagnosis system.
Owner:威胜百楚电力科技有限公司
Test apparatus and test method of stiffness of glass fiber mat and cloth
InactiveCN106442163AThe test results are accurateLittle external interferenceMaterial strength using steady bending forcesPre treatmentEngineering
The invention relates to a test apparatus and test method of the stiffness of a glass fiber mat and cloth. The test apparatus comprises a pedestal, a support, an up-and-down movement platform, a sample stage and a slide rail. The test method comprises the following steps: 1, cutting the glass fiber mat and cloth to be tested according to a prescribed dimension to form a sample to be tested, and carrying out standardized pretreatment on the sample to be tested; 2, tiling the pretreated sample to be tested on the sample stage, pushing the sample to be tested to forward move for a certain distance, and upward moving the up-and-down movement platform to make the upper surface of a horizontal scale just touch the falling edge of the sample to be tested; and 3, measuring the horizontal distance of the sample to be tested through the horizontal scale, measuring the falling distance of the sample to be tested through a height scale, and calculating the stiffness coefficient of the glass fiber mat and cloth sample to be tested, which is a ratio of the horizontal distance of the sample to be tested to the falling distance of the sample to be tested. The test method has the advantages of simple and effective process, scientific test principle and high test precision, and the test apparatus has the advantages of simplicity, durability, accurate test effect, convenience, and high practicality.
Owner:JUSHI GRP CO
Glass substrate air flotation device with deformation detection function and detection method
ActiveCN106938785ANo pollution in the processNo feverConveyorsFluid pressure measurementEngineeringPressure reduction
The invention discloses a glass substrate air flotation device with a deformation detection function. The glass substrate air flotation device comprises a transporting platform, a fixed platform and a base. The fixed platform is connected with the base through supporting columns. Driving devices used for driving a glass substrate to move are arranged on the two sides of the transporting platform. The transporting platform is provided with a plurality of conveying air holes arranged evenly. A sintered metal porous material is embedded in the top end of each conveying air hole. The bottom of each conveying air hole is connected with an air conveying pipe. The air conveying pipes are connected with a pressure reduction valve through a flowmeter. The pressure reduction valve is connected with an air source through a hose. At least two small holes are formed in the periphery of each conveying air hole of the transporting platform, the bottom of each small hole is connected with a pressure sensor through an air pipe, and the pressure sensors and the signal output end of the flowmeter are connected with an input conversion module. The glass substrate air flotation device with the deformation detection function has the advantages of being clean, free of pollution, heating and magnetism generation and the like, and a pneumatic system is easy to maintain and simple in structure.
Owner:JIANGSU UNIV OF SCI & TECH
Vehicle driving risk early warning method and device, storage medium and electronic equipment
InactiveCN109300333AHigh precisionReduce processingParticular environment based servicesAnti-collision systemsEarly warning systemMachine vision
The invention discloses a vehicle driving risk early warning method and device. The method comprises the following steps of acquiring vehicle data, calculating a current vehicle collision angle and other vehicle collision angles according to the vehicle data; according to the current vehicle collision angle, and other vehicle collision angle and the preset criterion, confirming whether the currentvehicle is in risk of being in collision with other vehicles or not; calculating the risk grade of the collision for a simulation in risk of collision; and carrying out risk early warning according to the risk grade of the collision. According to the method and the device, the vehicle driving risk is analyzed in real time through a preset early warning judgment algorithm, wherein the operation processing amount required by the preset early warning judgment algorithm is small, so that the early warning efficiency is improved; meanwhile, the method and the system are simple in structure, the expandability is high, and the problem that an existing risk early warning system which depends on machine vision is easily interfered by the outside, and the data processing capacity is large is solved; and the accuracy and the instantaneity of early warning are effectively guaranteed.
Owner:NEUSOFT CORP
Distributed optical fiber deformation tensile instrument and test method
ActiveCN104132622AThe solution cannot be simpleResolve accuracyUsing optical meansEngineeringTensile testing
The invention relates to a distributed optical fiber deformation tensile instrument, and particularly relates to a deformation tensile device used for simulating practical applications of optical fibers at different tensile states. The distributed optical fiber deformation tensile instrument comprises a tensile system and an optical fiber bearing platform. The tensile system and the optical fiber bearing platform are connected. The defect that a conventional optical fiber deformation tensile test instrument cannot simply and accurately monitor the sensing performance of distributed optical fibers under multiple working conditions is overcome. The test device can simply and effectively control the loading progress, and can carry out crack opening development simulation, small strain monitoring and variable-angle variable-elevation multi-condition basic application research through a finally established movable smart tensile platform. The problems such as low optical fiber survival rate, long model making cycle, poor effect and high cost in some indoor simulation tests are avoided. The deformation mechanism and the combination mechanism of a distributed optical fiber monitoring technology under complex load conditions and at various operating state forms can be studied.
Owner:HOHAI UNIV
Single-phase ground fault line selection method and device
ActiveCN108896875AHigh similarityIncrease line selection marginFault location by conductor typesTransient stateCross correlation matrix
The invention provides a single-phase ground fault line selection method, which comprises the following steps: separately acquiring transient zero-sequence currents of a half cycle after M lines is changed suddenly; acquiring a magnitude cross-correlation coefficient matrix G by a dynamic time bending distance algorithm; adopting plus or minus 1 to characterize the positive and negative polarity of the transient zero-sequence current, generating the transient zero-sequence current polarity coefficient matrix C of each line, and obtaining the polarity cross-correlation matrix H according to thepolarity coefficient matrix C of each line; combining the magnitude cross-correlation matrix G and the polarity cross-correlation matrix H to obtain a comprehensive cross-correlation matrix Q; usingthe comprehensive cross-correlation matrix Q as an input of a fuzzy C-means clustering, dividing the zero sequence current into two categories by the fuzzy C-means clustering, and selecting the faultline according to the category of each line. The invention also provides a single phase ground fault line selection device. The method and the device disclosed by the invention have less operation time, high accuracy and strong versatility.
Owner:STATE GRID FUJIAN JINJIANG POWER SUPPLY +1
Piezoelectric passive acceleration sensor
InactiveCN108008148ASmall probe sizeExtended operating temperature rangeAcceleration measurement using interia forcesAviationElectricity
The invention belongs to the technical field of sensor design, and relates to a novel piezoelectric passive acceleration sensor. The piezoelectric passive acceleration sensor comprises an end cover (1), mass blocks (2), piezoelectric plates (3), insulating sheets (4), a base (5), a shell (6), wires (7), a circuit board (8) and an aviation plug (9). When a sensor feels vibration, the mass blocks (2) can move relative to the base (5), the piezoelectric plates (3) are sheared to generate charges, the charge quantity is proportional to the vibration acceleration, the charge quantity is processed through the circuit board (8) and acceleration signals are outputted through the aviation plug (9). The acceleration sensor adopts a piezoelectric material as a conversion element, the dynamic range islarge, the frequency range is wide, the sensitivity error is small, the external disturbance is small, and no external power supply is needed. By adopting a shearing-type sensor structure, force measurement errors generated by deformation under sensor shell temperature or stress can be reduced.
Owner:JINCHENG NANJING ELECTROMECHANICAL HYDRAULIC PRESSURE ENG RES CENT AVIATION IND OF CHINA
Tension-free cable layover device
ActiveCN103138205BShorten the timeReduce manufacturing costApparatus for overhead lines/cablesHigh tension lineTraveling block
The invention discloses a tension-free cable laying spanning device, which comprises an elastic insulating rod, a cable guide rope and a series traction rope. The two ends of the elastic insulating rod are butted to form an elastic insulating ring. ring, and the series traction rope is fixedly connected with the elastic insulating ring. The invention also discloses a tension-free cable laying spanning device, which includes an insulating pulley, a cable guide rope and a series traction rope. The cable guide rope is slidably connected to the guide pulley of the insulation tackle. connecting rod connection. The invention uses elastic insulating rings or insulating pulleys to set an air channel under the existing high-voltage lines or bearing steel ropes, so that the construction cables can be guided to the destination conveniently and quickly, the construction difficulty is low, the time consumption is short, and the construction cost is greatly reduced , and the elastic insulating ring and the insulating pulley have a simple structure and are easy to maintain.
Owner:HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY +2
Early warning method and device for collision avoidance of navigable ship bridge
InactiveCN113299119AAccurate early warning informationLess interference from outsideMarine craft traffic controlMarine engineeringEarly warning signs
The invention discloses an early warning method and device for navigation ship bridge collision prevention, and belongs to the technical field of bridge construction and pier protection. According to the method, an early warning area, an emergency area and a danger area are set on navigation channels on the two sides of a bridge area according to the distance between a ship and a pier; real-time distance measurement is carried out on passing ships within a certain distance range of a bridge water area, whether the ships are located in the navigation bridge opening direction or not is detected, and if the ships are located in the non-navigation bridge opening direction, an early warning signal is sent out; when a ship enters an early warning area, a first-level early warning is given out, and the ship is reminded to drive into a normal navigation channel through sound-light alarm; when the ship enters the emergency area, a second-level emergency warning is given out to promote the ship to sail out of the emergency area, and meanwhile the ship is guided to sail normally through manual intervention; and when the ship drives into the danger area, a third-level emergency warning is sent out, bridge management personnel are notified to respond to emergency measures, and the ship is promoted to enter the safety channel. The early warning method and device are less affected by the outside, low in cost and simple to maintain.
Owner:HUAIYIN INSTITUTE OF TECHNOLOGY
Laser annealing platform device
ActiveCN102306620ASimple structureHeating evenlySemiconductor/solid-state device manufacturingLaser annealingEngineering
The invention discloses a laser annealing platform device which comprises a base, a furnace casing, a heating assembly, a heat insulation assembly, a tray and a plate unloading assembly. A furnace chamber is limited in the furnace casing, the upper surface of the furnace chamber is open, and the furnace casing is supported on the base; the heating assembly is arranged in the furnace chamber; the heat insulation assembly is arranged between the heating assembly and the inner wall of the furnace casing; the tray is arranged on the top surface of the furnace casing and is provided with a throughhole which passes through the tray axially; the plate unloading assembly is arranged on the base and is positioned between the furnace casing and the base, and comprises a plurality of thimbles and adriving assembly, wherein the driving assembly is used for driving the plurality of thimbles to move along the upper and lower direction so that each thimble can pass through the corresponding through hole upward and extend upward to the upper surface of the tray. According to the laser annealing platform device provided by the invention, the structure is simple, and the heating for a silicon wafer is uniform; and when the silicon wafer is placed and unloaded, the plate unloading assembly plays a role of assistance, thus the silicon wafer is more convenient to place and unload.
Owner:TSINGHUA UNIV
Novel method for determining petroleum in reclaimed land sample
InactiveCN110632043AReduce usageAvoid drudgeryPreparing sample for investigationFluorescence/phosphorescenceTest efficiencyUltimate tensile strength
The invention belongs to the technical field of determination of petroleum in a soil sample, and discloses a method for determining petroleum in a reclaimed land sample by accelerated solvent extraction-fluorescence spectrophotometry. The method comprises the following steps: petroleum components in a soil sample are extracted, concentrated and purified by an accelerated solvent extractor to obtain a to-be-determined extracting solution; and the to-be-determined extracting solution is excited at fixed excitation wavelength and the fluorescence intensity is determined, and the concentration ofpetroleum in the soil sample is calculated by using a standard working curve. According to the method, the accelerated solvent extractor is adopted for extracting the soil sample, petroleum componentsin the sample are extracted, the solvent consumption is small, the extraction efficiency is high, and the instrument is automatic. The determination based on fluorescence spectrophotometry is accurate, simple and convenient. The analysis and test efficiency is greatly improved while the accuracy and reliability of the test result are ensured.
Owner:XIAN CENT OF GEOLOGICAL SURVEY CGS
Early warning and sampling concrete surface elevation controller
ActiveCN103866800AEasy to makeLess interference from outsideMechanical depth measurementsFoundation testingEarly warning systemStructural engineering
The invention provides an early warning and sampling concrete surface elevation controller. The early warning and sampling concrete surface elevation controller comprises a controller base frame (1), on which a sampling device and an early warning device are installed; the sampling device is composed of a first hoisting mechanism (2), a measuring rope (5) and a concrete sampling device (7) connected to the measuring rope (5); the early warning device is composed of a second hoisting mechanism (3), a measuring rope (5), a concrete surface suspension device (6) connected to the measuring rope (5) and an alarm bell system (4) installed on the measuring rope (5) in series. The early warning and sampling concrete surface elevation controller has the following advantages that the production and use are simple, the measuring rope does not need to be lowered frequently in the pouring process to measure the concrete surface elevation, a concrete surface control early warning system can preliminarily judge the concrete surface elevation, and a sampling system samples and examines, thus, the external interference is less and the influence of the weather factors and the underground uncertainty factors can be effectively prevented. Therefore, the early warning and sampling concrete surface elevation controller can be applied to controlling the elevation of the underground pouring concrete surface, and has a very good effect according to experimental verification.
Owner:WUHAN SURVEYING GEOTECHN RES INST OF MCC
White LED light source generation device of transmission type visibility meter
ActiveCN105092538AImprove accuracySimple structureTransmissivity measurementsOptical pathColor temperature
The invention discloses a white LED light source generation device of a transmission type visibility meter. The white LED light source generation device comprises an LED light-emitting device (1), an optical splitter (4), a beam shaping device (5) and a light intensity detector (7). The input end of the LED light-emitting device (1) is electrically connected with a controller (8) through a signal generator (2). The optical splitter (4) is arranged on an output light path of the LED light-emitting device (1). The light intensity detector (7) is arranged on the output light path of the optical splitter (4), and the output end of the light intensity detector (7) is electrically connected with the controller (8). Particularly, the LED light-emitting device (1) emits white light, and the output light color temperature is 3000 K. The optical splitter (4) is an optical fiber optical splitter, wherein a first downlink optical interface (41) is located at a focus point of the beam shaping device (5), and a second downlink optical interface (42) is in optical connection with the light intensity detector (7). The output light path of the beam shaping device (5) is provided with a concave mirror (51), with the focal distance being 1200 mm, of an iris diaphragm (6), and the control end of the iris diaphragm (6) is electrically connected with the output end of the controller (8). The white LED light source generation device can serve as an ideal light source of the high-measuring-accuracy transmission type visibility meter.
Owner:ANHUI ATMOSPHERE DETECTION TECHN GUARANTEE CENT
Distributed optical fiber deformation tensile instrument and test method
ActiveCN104132622BControl loading progressLess interference from outsideUsing optical meansEngineeringTensile testing
The invention relates to a distributed optical fiber deformation tensile instrument, and particularly relates to a deformation tensile device used for simulating practical applications of optical fibers at different tensile states. The distributed optical fiber deformation tensile instrument comprises a tensile system and an optical fiber bearing platform. The tensile system and the optical fiber bearing platform are connected. The defect that a conventional optical fiber deformation tensile test instrument cannot simply and accurately monitor the sensing performance of distributed optical fibers under multiple working conditions is overcome. The test device can simply and effectively control the loading progress, and can carry out crack opening development simulation, small strain monitoring and variable-angle variable-elevation multi-condition basic application research through a finally established movable smart tensile platform. The problems such as low optical fiber survival rate, long model making cycle, poor effect and high cost in some indoor simulation tests are avoided. The deformation mechanism and the combination mechanism of a distributed optical fiber monitoring technology under complex load conditions and at various operating state forms can be studied.
Owner:HOHAI UNIV
Portable DC test discharge rod
InactiveCN107677851ARealize up and down movementLess interference from outsideElectrical measurement instrument detailsElectrical testingElectricityTest sample
The invention discloses a portable DC test discharge rod, relates to a discharge device used in an electric property testing process and is used for solving a problem of susceptibility of length change of a prior electricity testing rod due to external interference. The portable DC test discharge rod includes a telescopic insulation body comprising a bottom sleeve, a middle sleeve and an upper sleeve. A spiral screw rod having a length equal to that of the bottom sleeve is arranged in the bottom sleeve. A hollow connection rod having a length equal to that of the middle sleeve is arranged in the middle sleeve. A hollow screw rod having a length equal to that of the upper sleeve is arranged in the upper sleeve. The spiral screw rod is provided with male threads. The hollow screw rod is provided with female threads. The inner surface and the outer surface of the hollow connection rod are both provided with threads. The threads on the inner surface of the hollow connection rod cooperate with the male threads of the spiral screw rods. The male threads of the hollow connection rod cooperate with the female threads of the hollow screw rod. The portable DC test discharge rod is applied toDC voltage withstanding tests and releases electric charges accumulated on a test sample.
Owner:STATE GRID SHANDONG ELECTRIC POWER +2
Tension-free cable-laying crossing device
ActiveCN103138205AShorten the timeReduce manufacturing costApparatus for overhead lines/cablesHigh tension lineTraveling block
The invention discloses a tension-free cable-laying crossing device which comprises an elastic insulating rod, a cable guide rope and a serial hauling rope, wherein two ends of the elastic insulating rod are abutted joint to form an elastic insulating ring, the cable guide rope penetrates through the elastic insulating ring, and the serial hauling rope and the elastic insulating ring are fixedly connected. The invention further discloses the tension-free cable-laying crossing device which comprises an insulating tackle, a cable guide rope and a serial hauling rope, wherein the cable guide rope is connected on a guide pulley of the insulating tackle, and the serial hauling rope is connected with an insulating connecting rod of the insulating tackle. The elastic insulating ring or the insulating tackle is adopted, an air passage is arranged below an existing high-pressure line or a bearing steel rope, so that construction cables are convenient and rapid to guide to a destination, construction difficulties are low, time consumption is short, construction cost is reduced greatly, meanwhile, the elastic insulating ring and the insulating tackle are simple in structure and easy to maintain.
Owner:HUAIAN OF JIANGSU ELECTRIC POWER COMPANY POWER SUPPLY +2
Two-degree freedom measurement apparatus and method based on plane mirror imaging
InactiveCN105698712ASolving precise measurementsLess interference from outsideUsing optical meansMeasurement devicePlane mirror
The invention relates to a two-degree freedom measurement apparatus and method based on plane mirror imaging. The measurement apparatus comprises a reference fixed plate and a to-be-measured fixed plate; a reference plane mirror and a to-be-measured plane mirror are fixed on the reference fixed plate and the to-be-measured fixed plate respectively by fastening connecting elements; and reflection surfaces of the reference plane mirror and the to-be-measured plane mirror are opposite to each other. A mirror rack for installing a camera is arranged in front of the reflection surface of the reference plane mirror; a marking rod is arranged on the mirror rack and is parallel to the reference plane mirror; and the camera is connected with a computer by a data line. According to the invention, on the basis of a multi-times imaging principle of a plane mirror, an optical principle and a mechanical structure are combined; the optical path propagation is not affected by severe factors like the electromagnetism, temperature, humidity, and dust and the like; the external interference is low; the reliability and the viability are high. Moreover, the structure is simple; precise measurement of a yawing angle and a pitching angle between spatial planes is realized; and the apparatus and method play a role in guiding angle adjustment.
Owner:XIAN UNIV OF SCI & TECH
Laser annealing platform device
ActiveCN102306620BSimple structureEasy to unloadSemiconductor/solid-state device manufacturingEngineeringLaser annealing
The invention discloses a laser annealing platform device which comprises a base, a furnace casing, a heating assembly, a heat insulation assembly, a tray and a plate unloading assembly. A furnace chamber is limited in the furnace casing, the upper surface of the furnace chamber is open, and the furnace casing is supported on the base; the heating assembly is arranged in the furnace chamber; the heat insulation assembly is arranged between the heating assembly and the inner wall of the furnace casing; the tray is arranged on the top surface of the furnace casing and is provided with a through hole which passes through the tray axially; the plate unloading assembly is arranged on the base and is positioned between the furnace casing and the base, and comprises a plurality of thimbles and a driving assembly, wherein the driving assembly is used for driving the plurality of thimbles to move along the upper and lower direction so that each thimble can pass through the corresponding through hole upward and extend upward to the upper surface of the tray. According to the laser annealing platform device provided by the invention, the structure is simple, and the heating for a silicon wafer is uniform; and when the silicon wafer is placed and unloaded, the plate unloading assembly plays a role of assistance, thus the silicon wafer is more convenient to place and unload.
Owner:TSINGHUA UNIV
Method for distinguishing optical axis of camera in real time
InactiveCN105066964AReal-time determination of relative poseDiscrimination speed is fastPicture interpretationMachine visionOptical axis
The invention discloses a method for distinguishing the optical axis of a camera in real time, relates to a method for distinguishing relative poses of objects in machine vision in real time, and belongs to the field of machine vision. The method comprises steps as follows: Step one, LED flickers are mounted on a game display screen, a high-speed camera for acquiring images of the LED flickers mounted on the screen in real time is arranged in a virtual gun, and backlight removal treatment is performed on the acquired images of the LED flickers mounted on the screen; Step two, the mapping relation between acquired LED flicker positions and actual positions of the LED flickers on the game display screen is established according to parity of point numbers of the LED flickers, acquired by the virtual gun in real time, on the game screen and the LED flickers, and the relative poses of the objects in machine vision are distinguished in real time. According to the method, the position of the optical axis of the camera in machine vision is distinguished through LEDs arranged on the game display screen and calculation of the virtual gun mapping position relation, and the method is high in distinguishing speed and high in result precision and is slightly interfered by the outside.
Owner:RES INST OF BIT & ZHONGSHAN
A single-phase ground fault line selection method and device
ActiveCN108896875BHigh similarityImprove accuracyFault location by conductor typesShort-circuit testingCorrelation coefficientTransient state
The invention provides a single-phase ground fault line selection method, which comprises the following steps: separately acquiring transient zero-sequence currents of a half cycle after M lines is changed suddenly; acquiring a magnitude cross-correlation coefficient matrix G by a dynamic time bending distance algorithm; adopting plus or minus 1 to characterize the positive and negative polarity of the transient zero-sequence current, generating the transient zero-sequence current polarity coefficient matrix C of each line, and obtaining the polarity cross-correlation matrix H according to thepolarity coefficient matrix C of each line; combining the magnitude cross-correlation matrix G and the polarity cross-correlation matrix H to obtain a comprehensive cross-correlation matrix Q; usingthe comprehensive cross-correlation matrix Q as an input of a fuzzy C-means clustering, dividing the zero sequence current into two categories by the fuzzy C-means clustering, and selecting the faultline according to the category of each line. The invention also provides a single phase ground fault line selection device. The method and the device disclosed by the invention have less operation time, high accuracy and strong versatility.
Owner:STATE GRID FUJIAN JINJIANG POWER SUPPLY +1
A glass substrate air flotation device with deformation detection function and detection method
ActiveCN106938785BNo pollution in the processNo feverConveyorsFluid pressure measurementThermodynamicsEngineering
The invention discloses a glass substrate air flotation device with deformation detection function. The device, the transport platform is provided with several uniformly arranged conveying air holes, the top of the conveying air holes is embedded with sintered metal porous material, and the bottom of the conveying air holes is connected with a gas transmission pipe, which is connected with a pressure reducing valve through a flow meter to reduce pressure. The valve is connected to the air source through a hose; at least two small holes are arranged around each conveying air hole of the transportation platform, the bottom of the small hole is connected to the pressure sensor through the air pipe, and the signal output end of the pressure sensor and the flow meter is converted with the input Module connection. The glass substrate air flotation device with deformation detection function of the present invention has the advantages of cleanliness, no pollution, no heat generation, no magnetism, etc., and the pneumatic system is easy to maintain and simple to construct.
Owner:JIANGSU UNIV OF SCI & TECH
Wavelength division multiplexing passive optical network multicasting system based on code superposition
InactiveCN101883296BControl the extinction ratioRealize the multicast functionSpecial service provision for substationMultiplex system selection arrangementsOptical communicationClock signal
Owner:SHANGHAI JIAOTONG UNIV +1
An evaluation method for the quality of prefabricated concrete structure steel grout anchor lap joints
ActiveCN108896616BIncrease working frequencyLess interference from outsideBuilding reinforcementsMaterial resistanceReinforced concreteLap joint
The invention discloses an evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars. The evaluating method is characterized by comprising the following steps: sticking a piezoelectric patch to the middle part of the concrete surface in a grouting anchor lap joint area of the prefabricated concrete structural rebars; using a precise impedance analysismeter for applying a sweep frequency voltage signal to the piezoelectric patch; utilizing an electromechanical coupling effect of the piezoelectric patch and the structure to receive an electric admittance signal fed back by the piezoelectric patch; comparing with a standard conductivity signal curve; analyzing and testing a main peak frequency index and a root mean square RMSD index of the conductivity signal curve of the piezoelectric patch; and evaluating the quality of the grouting anchor lap joints of prefabricated concrete structural rebars in projects. The evaluating method has the advantages that the piezoelectric patch is integrated with a sensor and an exciter, the working frequency is high, the external disturbance is small, the grouting density in the grouting anchor lap jointarea can be accurately detected, no influence on the load-carrying capability of the grouting anchor lap joints is generated, the quick and efficient detection can be realized, the operation is simpleand the evaluating method is economical and practical.
Owner:NINGBO UNIV
A Monitoring Method for Density Defects of Reinforced Sleeve Grouting Material Based on Piezoelectric Impedance Effect
ActiveCN108226230BStress does not have any effectForced influenceMaterial impedanceElectric admittanceEngineering
The invention discloses a piezoelectric impedance effect based compactness defect monitoring method for a reinforcement sleeve grouting material. The method has the characteristics as follows: piezoelectric ceramic pieces are pre-embedded in the surface of a sleeve connected with tensioned reinforcement, the piezoelectric ceramic pieces are connected with a precision impedance analyzer through fine and soft wires, the precision impedance analyzer applies voltage signals to the piezoelectric ceramic pieces, and by means of electromechanical coupling effect of the piezoelectric ceramic pieces and the sleeve, electric admittance signals fed back by the piezoelectric ceramic pieces are received; if a defect exists, sleeve grouting is uncompact, compared with the electric admittance signals ofthe sleeve with compact grouting, the electric admittance signals of the piezoelectric ceramic pieces can change, and compactness of the sleeve grouting is quantitatively judged by adopting RMSD (root-mean-square deviation) as a defect index. The method has the advantages that a sensor and an actuator are integrated, working efficiency is high, outside interference is low, whether the sleeve grouting is compact can be monitored accurately, stress performance of sleeve connection is not affected, and rapid and effective monitoring can be realized.
Owner:NINGBO UNIV
A semiconductor device testing device and testing method thereof
ActiveCN103176116BEasy to operateThe test result is accurateIndividual semiconductor device testingDevice materialEngineering
The invention relates to a testing device and a testing method for semiconductor devices. The testing device comprises a testing platform and a probe station, the testing platform comprises a table plate, a circular piece fixed on the table plate, and a semiconductor device arranged on the circular piece, the semiconductor device comprises a testing chip and a non-testing chip, a probe in the probe station comprises a probe contacting with the front of the testing chip and a probe contacting with the silicon surface on the front of the non-testing chip and capable of applying high voltage, and the table plate is a grounded table plate. The testing method includes: fixing the circular piece on the table plate, and selecting the testing chip and the non-testing chip; grounding the table plate; enabling the testing probe to contact with the front of the testing chip, and grounding the testing chip; enabling the high-voltage probe to contact with the silicon surface of the front of the non-testing chip, and applying the high voltage to the testing chip through the high-voltage probe; and reading a voltage and current curve of the testing chip by the testing probe. The high voltage is directly applied on the front of the chip, so that interferences such as sparking are reduced, testing results are accurate, and safety is higher.
Owner:南瑞联研半导体有限责任公司
Railway digital train tail loop antenna and manufacturing method thereof
PendingCN110429377AGuaranteed work efficiencyEnhanced couplingAntenna adaptation in movable bodiesRadiating elements structural formsRadio frequencyOuter coil
The invention provides a railway digital train tail loop antenna and a manufacturing method thereof. The loop antenna comprises a housing, a coil assembly arranged in the housing and a tuning matchingdevice. A silk-covered wire in the coil assembly is wound around the loop outer surface of a loop inner fixation frame to form an inner coil, and is led to and wound around the loop outer surface ofa loop outer fixation frame to form an outer coil. The loop inner fixation frame and the loop outer fixation frame are stacked together and are glued together by a plurality of electrical adhesive tapes to make the inner coil and the outer coil become one body. A start wire of the inner coil of the silk-covered wire is connected with a radio frequency positive end of the tuning matching device; anend wire of the outer coil of the silk-covered wire is connected with a capacitor array in the tuning matching device; and the capacitor array is connected to a radio frequency negative end. Throughdouble-layer multi-strand winding of the silk-covered wire and superposition of inner and outer coils, and through paint dipping processing during manufacturing, the size and volume of the antenna canbe greatly reduced.
Owner:泉州市铁通电子设备有限公司
Evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars
ActiveCN108896616AIncrease working frequencyLess interference from outsideBuilding reinforcementsMaterial resistanceElectric admittanceRebar
The invention discloses an evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars. The evaluating method is characterized by comprising the following steps: sticking a piezoelectric patch to the middle part of the concrete surface in a grouting anchor lap joint area of the prefabricated concrete structural rebars; using a precise impedance analysismeter for applying a sweep frequency voltage signal to the piezoelectric patch; utilizing an electromechanical coupling effect of the piezoelectric patch and the structure to receive an electric admittance signal fed back by the piezoelectric patch; comparing with a standard conductivity signal curve; analyzing and testing a main peak frequency index and a root mean square RMSD index of the conductivity signal curve of the piezoelectric patch; and evaluating the quality of the grouting anchor lap joints of prefabricated concrete structural rebars in projects. The evaluating method has the advantages that the piezoelectric patch is integrated with a sensor and an exciter, the working frequency is high, the external disturbance is small, the grouting density in the grouting anchor lap jointarea can be accurately detected, no influence on the load-carrying capability of the grouting anchor lap joints is generated, the quick and efficient detection can be realized, the operation is simpleand the evaluating method is economical and practical.
Owner:NINGBO UNIV
Textile tensioner based on adjusting device
The invention discloses a textile tensioner based on an adjusting device, which comprises a main body, an automatic adjusting device is arranged on the main body, and the automatic adjusting device comprises a cavity, an electromagnetic coil, an iron core, a spring and a chassis; the cavity is provided with a cavity for accommodating the iron core; the iron core is arranged in the cavity, and the lower end of the iron core extends out of the cavity from the opening; the part, extending out of the cavity, of the iron core is provided with a through hole allowing yarn to penetrate through. The electromagnetic coil is wound on the outer side wall of the cavity; the spring is sleeved outside the iron core; the chassis is positioned right below the iron core and is fixed on the main body; the base plate is a magnet plate. An automatic adjusting mode is adopted, the yarn tension can be rapidly adjusted, the yarn tension is prevented from being too large or too small, and then the yarn breaking or winding problem is prevented; manual adjustment is adopted, external interference is small, an operator can freely adjust the yarn tension adjusting device according to actual production and processing conditions, controllability is large, it is helpful to guarantee stability of yarn tension, and production and processing efficiency and quality are improved.
Owner:安徽职业技术学院
Transmissive visibility meter white led light source generating device
ActiveCN105092538BSimple structureCompact structureTransmissivity measurementsLight emitting deviceBeam shaping
The invention discloses a white LED light source generation device of a transmission type visibility meter. The white LED light source generation device comprises an LED light-emitting device (1), an optical splitter (4), a beam shaping device (5) and a light intensity detector (7). The input end of the LED light-emitting device (1) is electrically connected with a controller (8) through a signal generator (2). The optical splitter (4) is arranged on an output light path of the LED light-emitting device (1). The light intensity detector (7) is arranged on the output light path of the optical splitter (4), and the output end of the light intensity detector (7) is electrically connected with the controller (8). Particularly, the LED light-emitting device (1) emits white light, and the output light color temperature is 3000 K. The optical splitter (4) is an optical fiber optical splitter, wherein a first downlink optical interface (41) is located at a focus point of the beam shaping device (5), and a second downlink optical interface (42) is in optical connection with the light intensity detector (7). The output light path of the beam shaping device (5) is provided with a concave mirror (51), with the focal distance being 1200 mm, of an iris diaphragm (6), and the control end of the iris diaphragm (6) is electrically connected with the output end of the controller (8). The white LED light source generation device can serve as an ideal light source of the high-measuring-accuracy transmission type visibility meter.
Owner:ANHUI ATMOSPHERE DETECTION TECHN GUARANTEE CENT
A two-degree-of-freedom measuring device and method based on plane mirror imaging
InactiveCN105698712BSolving precise measurementsLess interference from outsideUsing optical meansMeasurement devicePlane mirror
The invention relates to a two-degree-of-freedom measuring device and method based on plane mirror imaging. The measuring device includes a reference fixed plate and a fixed plate to be measured, and a reference plane mirror is fixed on the reference fixed plate and the fixed plate to be measured by fastening connectors respectively. and the plane mirror to be measured, the reference plane mirror is arranged opposite to the reflection surface of the plane mirror to be measured, a mirror frame on which a camera can be installed is arranged in front of the reflection surface of the reference plane mirror, a marking rod is arranged on the mirror frame, and the marking rod is parallel to the reference plane mirror, and the camera Connected to the computer through the data line, the invention applies the principle of multiple imaging of the plane mirror, and combines the optical principle with the mechanical structure. High performance, strong survivability, and simple structure, it solves the precise measurement of yaw angle and pitch angle between space planes, and has a guiding role in angle adjustment.
Owner:XIAN UNIV OF SCI & TECH
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