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49results about How to "The test method is simple and reliable" patented technology

Test circuit and method for low-voltage physical model of unified power flow controller

ActiveCN103955141AAdequate test basisMeet the test verification requirementsSimulator controlTest powerTransient state
The invention relates to a test circuit and method for a low-voltage physical model of a unified power flow controller. The circuit comprises a test power circuit, a regulating transformer, a first bus, a third bus and a second bus, wherein the test power circuit, the regulating transformer, the first bus, the third bus and the second bus are sequentially connected. A phase-shifting device is arranged between the first bus and the second bus, and a bypass switch and a voltage disturbance generating device which are connected in parallel are arranged between the first bus and the third bus. A parallel transformer, a low-voltage physical model device of the unified power flow controller, a series transformer and an electric reactor are sequentially arranged between the third bus and the second bus, wherein the auxiliary side of the series transformer is connected with the third bus. According to the method, a steady state control policy, a transient state control policy and a dynamic control policy of the UPFC are verified by simulating various normal and fault working conditions of an electric power system. According to the technical scheme, the test method is simple and reliable, the various normal and fault working conditions of the electric power system cane be constructed, and the test verification requirements of the control policies of the UPFC are met.
Owner:STATE GRID CORP OF CHINA +1

Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof

ActiveCN103954866AThe structure of the test device is simpleThe test method is simple and reliableElectrical testingCapacitanceCell controller
The invention relates to a testing circuit of a half-bridge-structure voltage source current converter and a modulation method of the testing circuit. The testing circuit comprises a testing power source circuit, a direct current power source, a half-bridge-structure voltage source current converter sub-module 1, an impedance load and a half-bridge-structure voltage source current converter sub-module 2. According to the modulation method, by setting the output voltage of the direct current power source, the voltage of a direct current bus meets the requirement, and a direct current side capacitor of the half-bridge-structure voltage source current converter is charged; after charging is stable, a circuit controller is controlled to output PWM pulse signals, and the half-bridge-structure voltage source current converter operates under different work conditions; by measuring the current and the voltage of the impedance load and simulating various faults of the half-bridge-structure voltage source current converter, the performance and stability of the half-bridge-structure voltage source current converter are checked. By constructing the various work conditions of the half-bridge-structure voltage source current converter, the experimental verification requirements of the design of the half-bridge-structure voltage source current converter and a unit controller control strategy are met.
Owner:STATE GRID CORP OF CHINA +1

Load spectrum testing method for excavator working device

The invention discloses a load spectrum testing method for an excavator working device. The method comprises the steps that firstly, displacement sensors and pressure sensors are arranged at all hydraulic cylinders of the excavator working device to obtain hydraulic cylinder telescopic amount data and hydraulic cylinder force data; then, cutting off is carried out on a bucket rod with a virtual plane, a disengagement body is obtained, the position of the gravity center of the disengagement body is calculated, a strain rosette is arranged on the part of the cut section on the bucket rod, the internal force component of the section is derived, the load time course of the tip of an excavator bucket is obtained through the section internal force according to the balance relation of force in combination with the structural size of the working device, and the load spectrum of the working device can be compiled with the load time course. The load spectrum obtained with the method includes the influence of the borne positive load in the excavating process, also includes the influences of eccentric loads and side loads, and coincides with the practical conditions better; the method is suitable for tests of load spectra of various excavator working devices and can also be used for load spectrum tests of other structures bearing movable load action.
Owner:CHANGAN UNIV

Test method and test device for asphalt pavement crack load response relative displacement

ActiveCN105527165AAccurately measure levelsAccurately measure vertical relative displacementMaterial strength using tensile/compressive forcesRelative displacementRoad surface
The invention discloses a test method and a test device for asphalt pavement crack load response relative displacement. The test method comprises steps as follows: a, a reference part and a sensor positioning part are arranged on two sides of a to-be-tested crack, and a horizontal linear displacement sensor and a vertical linear displacement sensor are fixedly arranged on the sensor positioning part; b, a test vehicle is stopped in positions of the reference part and the sensor positioning part in Step a; c, the sensors are started, the test vehicle slowly runs forwards and passes by the sensor positioning part and the reference part sequentially, after the test vehicle runs for a proper distance, the sensors are turned off, and the test is finished. The test device comprises the reference part, the sensor positioning part, the horizontal linear displacement sensor, the vertical linear displacement sensor and a controller. Compared with the prior art, the test method and the test device have the advantages that horizontal and vertical relative displacement between two plates of the crack can be measured accurately, and the cause and the development degree of the crack are determined through displacement features.
Owner:SHANDONG TRANSPORTATION INST +1

Real-time ultrasonic scanning device used during rock triaxial compression

The invention provides a real-time ultrasonic scanning device used during rock triaxial compression. The real-time ultrasonic scanning device comprises an axial pressing structure, a circumferential pressing structure and an ultrasonic scanning structure, wherein the axial pressing structure is an electro-hydraulic servo system (1), the circumferential pressing structure comprises an axial-penetrating cylinder barrel (9), the upper end and the lower end of the cylinder barrel (9) are respectively sealed by a top cover (3) and a bottom cover (14), the cylinder barrel (9), the top cover (3) and the bottom cover (14) jointly form a confining pressure chamber (7), a sample testing chamber (10) is arranged in the confining pressure chamber (7), and the ultrasonic scanning structure is a plurality of groups of ultrasonic scanning probes (13) connected to the outer lateral wall of the testing chamber (10). The real-time ultrasonic scanning device has the advantages that ultrasonic scanning can be performed on rock during the rock triaxial compression to monitor the generation of the internal cracks of the rock in real time, accurate experiment data can be obtained, a reliable testing and experiment result can be provided for a project, and a reliable testing method is provided for the prevention of project disasters and accidents caused by the cracks.
Owner:HUBEI UNIV OF TECH

Method for detecting surface viscosity of prepreg tows for automatic tow placement

ActiveCN109580476AImprove methods that can only be qualitatively graded but not quantifiedAvoid human errorUsing mechanical meansMaterial analysisFiberCarbon fibers
The invention relates to a method for detecting the surface viscosity of prepreg tows for automatic tow placement, and belongs to the technical field of prepreg automatic tow placement molding. The method comprises the steps that firstly, two prepreg tows are pre-bonded, the main axis direction of the bonding surface of the two prepreg tows is the same as the direction of carbon fibers in the prepreg tows, then a bonding area is placed on a mechanical hot pressing platform for hot pressing lap joint, the prepreg tows are separated from the hot pressing platform by a demould material, a temperature required for the lap joint is 10DEG C-60DEG C, the pressure for the lap joint is 0.1MPa-0.6MPa, and the time for the lap joint is 1min-10min; and then, a sample is symmetrically clamped on a clamp of a tensile tester, the tensile tester is started, and a tensile failure load of the prepreg tow sample is used as a quantitative characterization result of the surface viscosity. A surface viscosity value of the prepreg tows obtained by the method can be directly used for comparing the surface viscosity of various materials, can further be used for exploring the influencing factors of the surface viscosity of the prepreg tows, and has wide application prospects in practical production and scientific research fields.
Owner:AVIC COMPOSITES +1

System and method for detecting dynamic range of satellite navigation signal

InactiveCN104635246AExperimental verification of correctnessExperimental verification of practicalitySatellite radio beaconingExperimental validationRadio frequency signal
The invention provides a system for detecting dynamic range of a satellite navigation signal. The system comprises a satellite navigation signal simulator, a frequency meter, a frequency automatic collecting device and a dynamic range analysis and calculating module. The system for detecting the dynamic range of the satellite navigation signal is utilized. The invention also provides a method for detecting the dynamic range of the satellite navigation signal; on the basis of satellite navigation signal simulator working principle and Doppler effect, a radio frequency signal received by a receiver under different dynamic environments can be simulated in real time, the method for detecting the dynamic range of the satellite navigation signal is analyzed at the aspects, such as speed, acceleration and jerk, a dynamic range detecting platform is built, a specific testing scheme is formed, and the experiment is conducted to verify the correctness, practicality and effectiveness of the testing method. The testing method has the advantages that the simplicity, convenience and reliability are realized, and the dynamic range of the satellite navigation signal can be correctly detected in the simulating environment.
Owner:SHANGHAI INST OF MEASUREMENT & TESTING TECH

Real-time detection method for compactness of poured vault

The invention provides a real-time detection method for the compactness of a poured vault. The real-time detection method comprises the following specific steps of: mounting an acoustic wave testing device below an vault template; establishing an offline acoustic waveform database; transmitting an acoustic wave signal to the vault template by a transmitting unit, and receiving the acoustic wave signal by a receiving unit; comparing detected waveform data transmitted back by a receiver with data in the acoustic waveform database in real time by an upper computer, and matching a waveform with the highest overlap ratio with the current compactness echo in the database; and performing measurement compactness degree judgment on the matching degree of the waveform data by the upper computer. Byadopting the real-time detection method, the vault compactness monitoring in the whole process of concrete pouring and solidification can be effectively met, and the quality of secondary lining is practically guaranteed; and a non-contact vault detection mode is adopted, the device is mounted on a vehicle, any operation such as paving a detection piece before construction is not needed, and the simplest, more convenient and more reliable test method is provided.
Owner:CHINA RAILWAY CONSTR HEAVY IND

Method for testing foil resistivity

The invention provides a method for testing foil resistivity. The method comprises the following steps: S1, cutting a foil to be tested into a plurality of samples with different lengths and equal widths; S2, testing the resistance Ri of each sample, wherein i is a sample number; S3, drawing a coordinate taking the length Li of each sample as a transverse axis and taking the resistance Ri of eachsample as a longitudinal axis, substituting each coordinate point (Li, Ri) into the coordinate to draw an oblique line, and acquiring the slope k of the oblique line, wherein i is an element of a set(1, n), and n is the quantity of samples; and S4, acquiring the resistivity of the foil to be tested according to a slope curve k=rho / S, wherein rho is the resistivity, and S is the cross sectional area of each sample of a unit length. According to the method, the slope k is obtained through coordinate fitting, so that the influence of external resistance on sample testing is eliminated, and the intrinsic resistivity of the foil to be tested can be calculated accurately. The testing method is simple and reliable, has high data accuracy, can realize accurate measurement of the resistivity of the foil, and has great application prospect in the field of lithium ion battery current collectors.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY

Method for testing tightness of welding lines

The invention provides a method for testing tightness of welding lines, comprising the steps as follows: selecting a transparent vacuum box which is communicated with a vacuumizer through a pipeline and is provided with a vacuumatic pressure gauge capable of displaying the vacuum degree in the vacuum box; selecting a welding line required to be tested, cleaning the areas respectively about 20mm away from the welding line required to be tested at the right side and at the left side, coating soap solution on the areas, and covering the vacuum box on the welding line coated with the soap solution; compressing the vacuum box, opening the vacuumizer valve, observing whether bubbles belch out of the surface of the welding line or not when the vacuum degree displayed on the vacuumatic pressure gauge is in the range of 0.015-0.02MPa; if so, determining the welding line to be unqualified and rechecking after repair; and if not, determining the welding line to be qualified. The invention has the advantages of reducing workload of tightness test for docks, effectively shortening the production cycle of slipways, optimizing tight working environment, enabling high altitude sealing working to be operated on flat ground, and leading the operation to be more safe; the test method is simple and reliable, namely the test is accurate, the operation is convenient, and the tightness working efficiency is improved effectively.
Owner:浙江东海岸船业有限公司

ict

The invention discloses an ICT. The ICT comprises a floor, an electrical element pin testing mechanism, an electrolytic capacitor reverse plugging testing mechanism and a needle base reverse pluggingtesting mechanism, wherein the floor is driven to move towards an element side of a circuit board, the electrical element pin testing mechanism is arranged on the floor and used for testing whether ornot electrical elements, located on the element side, of pins can be normally used, the electrolytic capacitor reverse plugging testing mechanism is arranged on the floor and used for testing whetheror not an electrolytic capacitor on the element side is plugged reversely, and the needle base reverse plugging testing mechanism is arranged on the floor and used for testing whether or not a to-be-tested needle base on the element side is plugged reversely. By arranging the electrical element pin testing mechanism, the electrolytic capacitor reverse plugging testing mechanism and the needle base reverse plugging testing mechanism on the floor simultaneously, the technical problems in the prior art are solved that a floor testing function of an ICT is monotonous, comprehensive checking on electrical elements on the element side of the circuit board is lacked, and whether or not different electrical elements located on the element side of the circuit board are plugged reversely cannot bechecked simultaneously.
Owner:GREE ELECTRIC APPLIANCES ZHENGZHOU +1

Method for testing pore closing temperature of diaphragm

The invention discloses a method for testing the pore closing temperature of a diaphragm. The method comprises the following steps: preparing a first standard diaphragm, a second standard diaphragm, athird standard diaphragm, standard green adhesive tapes, a standard copper foil and a standard aluminum-plastic film, wherein the middle of the standard green plastic adhesive is provided with a circular hole with a preset diameter; respectively pasting one to five layers of the first standard diaphragm to one of the standard green adhesive tapes to obtain a first target diaphragm; respectively pasting one to five second standard diaphragms to one of the standard green adhesive tapes to obtain a second target diaphragm; respectively pasting one to five layers of the third standard diaphragm to one of the standard green adhesive tapes to obtain a third target diaphragm; sequentially assembling the first target diaphragm, the second target diaphragm, the third target diaphragm, the standardcopper foil, the standard aluminum-plastic film and a preset battery to obtain a corresponding flexibly packed battery; and measuring impedance of the flexibly packed battery by adopting an electrochemical workstation, linearly fitting the ohmic impedance value and the diaphragm layer number, and calculating the ion conductivity of the diaphragm to obtain the catastrophe point of the ion conductivity of the diaphragm, that is the corresponding pore closing temperature of the diaphragm.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY

Bench test method for automatic locking and unlocking control of special vehicle comprehensive transmission device

ActiveCN112504669ASolve the problem that the automatic closing and unlocking function cannot be testedThe test method is simple and reliableVehicle testingMachine part testingBench testElectrical and Electronics engineering
The invention belongs to the technical field of special vehicles, and particularly relates to a bench test method for automatic locking and unlocking control of a special vehicle comprehensive transmission device. The method comprises the following steps: under the condition that a bench test cannot provide real vehicle bus information, reading a bus signal and specific parameters of the comprehensive transmission device; judging whether the comprehensive transmission device works under the working condition of the bench or not; under the bench test working condition, a fan is set to work under the mechanical working condition, the rotating speed of the fan is collected, the rotating speed of the engine is obtained according to the rotating speed ratio of the fan to the engine, a hydraulictorque converter is controlled to be automatically locked and unlocked through an engine rotating speed signal, so that the automatic locking and unlocking function test of the hydraulic torque converter under the bench working condition is achieved. According to the method, the automatic locking and unlocking bench test of the comprehensive transmission device can be carried out under the condition of lack of a real vehicle environment without adding extra equipment and operation, the problem that the automatic locking and unlocking function cannot be tested in the bench test is solved, andthe test method has the characteristics of simplicity, reliability, good real-time performance, low cost and the like.
Owner:CHINA NORTH VEHICLE RES INST

Gasoline engine inverter automatic test method and system

The invention provides an automatic testing method and an automatic testing system for a gasoline engine inverter, wherein the automatic testing method comprises the steps of respectively acquiring the voltage, the current and the THD value of an inverter in states such as idle state and loaded state by means of the automatic testing system, automatically generating a testing report, printing a testing label, and realizing automatic testing function of the inverter. The testing system comprises a to-be-tested inverter and a main controller. The automatic testing method and the automatic testing system are characterized in that the information input end of the main controller is connected with the information output end of a tester; the first input end of the tester is connected with the output end of the to-be-tested inverter; the control output end of the main controller is connected with the input end of a driver; the first output end of the driver is connected with the frequency modulation control end of a power supply; the power supply is connected with the power input end of the to-be-tested inverter; and the communication end of the main controller is connected with the debugging end of the to-be-tested inverter. The automatic testing method and the automatic testing system have advantages of simple structure and high operation reliability.
Owner:CHONGQING YUXIN PINGRUI ELECTRONICS
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