74 results about "Double test" patented technology

The invention relates to a method for testing double segments Zinc oxide arrester insulation state, which belongs to the field of power supply establishment test technology. According to the invention, the first grounded ammeter is connected in series with Zinc oxide arrester lower segment, the middle connecting part between the two segments is connected with direct current high voltage test instrument and the second ammeter, pressurizing from the middle connecting part of the two arrester, at first observating the first ammeter, adjusting for obtaining the leak current valve of the arrester; then adjusting the direct current high voltage test instrument, reading current valves of the first ammeter and the second ammeter, obtaining the leak current valve of the upper segment of the arrester from the difference of the two readings. The method of the invention can avoid removing high voltage down-lead, without ascent, reduce the labour intensity and working danger, at the same time avoid the bother of wire change in test, and improve working efficiency. In addition, because the middle segment wire of the double segments Zinc oxide arrester is lower than the top of the upper segment, it is safe and simple to test wire with a certain included angle.

The invention relates to a heat conductivity coefficient measurer of a double-test-piece guarded hot plate for a liquid nitrogen temperature area, comprising a vacuum cover, a guarded hot plate, two liquid nitrogen containers, three temperature sensors, a supporting plate, a sliding structure, a clamping structure and a hanging structure, wherein the guarded hot plate is arranged between the two liquid nitrogen containers; the clamping structure is arranged on the liquid nitrogen containers; the liquid nitrogen containers and the guarded hot plate are fixed on the sliding structure; the sliding structure is connected with the hanging structure; the hanging structure is fixed at the upper end in the vacuum cover; the guarded hot plate and the liquid nitrogen containers are fixed on the hanging structure; and the vacuum cover is welded on the supporting plate. The invention is used for measuring the heat conductivity coefficient of a heat insulating material of the liquid nitrogen temperature area, wherein a testing part is hung on the vacuum cover, and glass fiber reinforced plastics are used as the heat insulating material, thereby liquid nitrogen evaporation is reduced; and a vacuum pumping processing mode is adopted, thus the measurement errors brought by heat conduction and convective heat exchange of air are effectively reduced.

The invention relates to a rail vehicle grounding drainage test apparatus, and more specifically relates to a rail vehicle shaft end grounding apparatus wear test bench. The test bench comprises a test equipment assembling body, a heat dissipation fan assembling body and a test apparatus protective cover assembling body, wherein the test apparatus protective cover assembling body is fixed above the test equipment assembling body; the heat dissipation fan assembling body is fixed above the test apparatus protective cover assembling body, the test equipment assembling body comprises two symmetrically arranged test shaft assembly and bearing pedestal assembling bodies and a motor and motor support column assembling body; and the motor and motor support column assembling body and the two test shaft assembly and bearing pedestal assembling bodies are respectively in transmission connection through driving belt assemblies. Through a double-test-shaft transmission test apparatus provided by the invention, the rotating speed and the current working condition of a motor train unit in an actual track can be accurately simulated, a quite good test foundation is provided for a loss test of a rail vehicle shaft end grounding apparatus, and the accuracy of test data is guaranteed.

The invention discloses a vibration fault diagnosis method for a doubly-fed wind turbine. The method comprises the steps: extracting the fault characteristics of the bearing by performing spectrum andenvelope spectrum analysis on the vibration data, and determining whether the vibration fault is caused by a mechanical fault if the vibration fault of a tested double-fed wind turbine occurs; determining whether a three-phase unbalance occurs by extracting a voltage and current signal during the operation of the turbine stator, and determining whether the vibration fault is caused by an electrical fault; performing dielectric loss factor and capacitance measurement on the stator windings to determine whether the three-phase unbalance is caused by an insulation degradation if the electrical fault occurs; and stopping the turbine and performing a shock waveform test to determine the fault phase of the insulation degradation of the tested turbine stator if the insulation degradation occurs.The method comprehensively diagnose the vibration fault by combining the vibration signal with the electrical signal, so that the defects and deficiencies of the single monitoring signal are overcome, the accuracy of the diagnosis result is improved, the diagnosis of the phase of the insulation fault of the stator can be realized, and the difficulty of the repairing and maintaining the wind turbine can be reduced.

The invention relates to a reverse-flow type frequency conversion speed regulation multi-fan array wind tunnel and a test method thereof. The wind tunnel is a hollow-square structure integrally and comprises a multi-fan power section (1), a first test section (2), a first corner (3), a first reverse-flow section (4), a second corner (5), a stable section (6), a contraction section (7), a second test section (8), a first expansion section (9), a third corner (10), a second expansion section (11), a fourth corner (12) and a second reverse-flow section (13) which are sequentially connected. The adaptive control technology is employed to realize frequency conversion speed regulation of a multi-fan system, the first test section and the second test section are adjusted according to test objects; the reverse-flow type and double-test section modes are employed, and properties of small energy loss and wide application field are realized.

The invention relates to a method for testing double-direction torque of an eddy current dynamometer. In the method, a pull pressure sensor with a strain chip type structure is subjected to stressing calibration through analog-to-digital conversion to generate the double-direction torque according to different positive and negative voltages generated by the tensile force and the pressure of the pull pressure sensor, and the rotation direction of a prime motor is determined through positive and negative torque voltages according to a forward zero point, forward fullness, a reverse zero point and reverse fullness of the calibration, so that respective calibration data is called without any improvement on mechanical structures; the test method is simple and practical and is extremely high incost performance; in a test for measuring the torque of a motor or an engine, the problem that measurement accuracy is drifted due to incapability of zeroing of a mechanical position generated by applying double-direction force to a swing body measured by the eddy current dynamometer during torque direction variation of an S-shaped pull pressure sensor in the prior art is solved; and when new energy source power racks such as the motor and the like are tested, the positive and negative rotation of the motor can be automatically determined according to measured different positive and negative torque, so that measurement accuracy and testing efficiency are effectively improved.

The invention discloses a compound SrCdGeS4 and a preparation method thereof, and an infrared nonlinear optical crystal as well as a preparation method and application thereof. A SrCdGeS4 compound pure phase is prepared by adopting a high-temperature solid-phase reaction method through two times of sintering, and the infrared nonlinear optical crystal grows by adopting a horizontal gradient condensation method or a Bridgman method. According to the method disclosed by the invention, the crystal easily grows and has relatively high quality; and the method the advantages of relatively high growth speed, low cost and easiness of obtaining crystals with relatively large sizes. An infrared nonlinear powder frequency doubling test shows that under the irradiation of fundamental frequency light which is 2090nm laser, the SrCdGeS4 has a very high nonlinear effect; and the frequency doubling signal intensity in a grain diameter range of 41mu m-74mu m is about three times of the signal intensity of an infrared classic material AgGaS2 with the same grain diameter. An infrared nonlinear optical crystal material SrCdGeS4 obtained by the invention has a potential application value in the field of infrared laser frequency conversion.

The invention provides a method for testing pump absorption coefficients of a double-coated gain fiber. The method comprises the following steps: (S1) welding an LD pump light source tail fiber with a fiber combiner pump tail fiber by virtue of a hectowatt-order LD pump light source needing to be subjected to wavelength testing, coupling pump light into high reflection grating by virtue of a fiber combiner, outputting the pump light from a high reflection grating tail fiber, and recording an output power value as pump coupling power; (S2) selecting a to-be-tested double-coated gain fiber with an initial length L0 less than or equal to 40m, and building a hectowatt-order vibration structure fiber laser device; (S3) recording power values of a fiber output end by virtue of a truncation method when the lengths of the to-be-tested fiber are L0, L1......LN and power values of an input end when a 45-degree dichroic mirror is inserted into the input end, so as to obtain corresponding surplus pump light power under each fiber length; and (S4) carrying out calculation and statistics so as to obtain the pump absorption coefficients of the double-coated gain fiber. According to the method, the influence caused by ASE upon a testing result can be omitted, a testing platform is stable and safe, and the accurate measurement of the pump absorption coefficients of a double-coated gain fiber is realized.

A method for testing a double-kernel browser comprises the steps that a preset URL address is input into a location bar of the browser through an automatic testing tool based on a UI; according to webpage information and preset selection logic which correspond to the URL address, a kernel is selected by the browser so that the webpage information corresponding to the URL address can be displayed; the currently-used kernel of the browser is obtained by the browser through a preset standard control and kernel information is displayed through the standard control; the kernel information displayed by the standard control on the browser is obtained through the automatic testing tool based on the UI; the obtained kernel information is compared with preset expected kernel information corresponding to the URL address, so that a log is generated. The invention further provides a system for testing the double-kernel browser. According to the method and system for testing the double-kernel browser, the invisible logic is displayed through the standard control on the UI so that the current kernel can be judged by the automatic testing tool based on the UI according to the attribute of the standard control, an automatic test can be conducted, the testing time can be shortened, and the testing efficiency can be improved.

The invention discloses a C++ program remote debugging method based on a GNU (GNU's Not Unix) open source software, comprising the steps of constructing a C++ engineering project, programming an engineering property wizard; constructing a C++ remote compiling and debugging tool chain; achieving the communication of a remote host and a local host to set local and remote file mapping paths for the constructed engineering so as to achieve the automatic synchronization of the file on the remote host and the local file; programming remote and local debug plans; developing all kinds of C++ business components by an auxiliary development tool; editing input and output parameter files; compiling and debugging a program, that is, achieving the compiling and the debugging of the remote executable program by the debug function of Eclipse through the remote debug plan; and according to an input parameter, outputting the corresponding executed result. The method provides a visual development environment, reduces the requirement of business developers on knowing Unix command line, and has a reliable double test program due to the local and remote debug plans.

The invention discloses a single-pivot double row rolling bearing supporting type rotor comprehensive performance experiment device comprising a variable frequency motor, an experiment main shaft, two bearing pedestals, a loading bracket, double rows of rolling bearings, an axial loading device and a radial loading device. The two bearing pedestals and the variable frequency motor are installed on an experiment table pedestal. The experiment main shaft is supported on the two bearing pedestals and connected with the variable frequency motor. The axial loading device and the radial loading device are arranged between the two bearing pedestals. The experiment main shaft is provided with the double rows of rolling bearings which are installed in a bearing sleeve. The bearing sleeve is installed on the experiment table pedestal. A temperature sensor and an acceleration vibration sensor are installed on the bearing sleeve. Axial loading and radial loading are performed on the double rows of rolling bearings by the axial loading device and the radial loading device so that axial and radial loads can be accurately applied to the tested double rows of rolling bearings simultaneously. The single-pivot double row rolling bearing supporting type rotor comprehensive performance experiment device can be used for simulating comprehensive performance of engine main shaft bearings under the complicated conditions of high temperature and high DN value.

The invention discloses a machine for testing the electrical function of a keyboard. The machine is of a double-test-table structure, and therefore the time for fetching and placing the keyboard can be effectively shortened, and test efficiency can be improved. In the working process, the keyboard is accurately clamped and positioned through a keyboard clamping and positioning assembly, a pressing fixing assembly clamps and fixes a connecting flat cable of the keyboard to be tested; a left stepping motor and a right stepping motor drive a left test table and a right test table to move backwards to enter the position under a keyboard knocking assembly, a prepressing rod rolls keys of the keyboard before the keyboard enters a knocking region, prepresses the keys of the keyboard and simulates the pressed movement of the keys, a lead screw servo motor drives key knocking heads to horizontally move, and an electric control cabinet controls the key knocking heads to move and simulates knocking key movements. In the whole test process, a displayer can display a test result in time for users to conveniently check. Accordingly, the machine can efficiently and automatically detect the electrical function of the keyboard, in other words, the machine has the advantages of being high in working efficiency, positioning accuracy and flexibility.

The invention relates to a large tonnage lifting hook performance test bench. A rotation assembly comprises: a pedestal, a turntable, a wire rope connecting seat and a hydraulic clamping assembly. The pedestal is connected with the turntable. The wire rope connecting seat is respectively fixed on the turntable. The wire rope connecting seat is connected with a wire rope through a bolt which passes through a center of the wire rope connecting seat. Two hydraulic cylinders are fixed on the turntable. A loading assembly comprises: an installation platform, a jack seat, a jack, an I beam, supporting seats. The jack seat is fixed on the bottom installation platform. The jack is installed in the jack seat. A top of the jack is fixedly connected with the supporting seats through the I beam. The two supporting seats are connected with each other through a supporting shaft. The test bench possesses a double test function of loading and rotation flexibility and a function of overall combinationtest. The test bench can be used to satisfy a detection requirement of lifting hook loading performance which includes: lifting hook pulley tension, lifting hook head tension, lifting hook and pulleyconnection board tension and the like. Simultaneously, the test bench is suitable for detecting rotation flexibility of the lifting hook head.

This invention relates to a method for testing double ends in the translay protection of a transmission line including: 1, a protection device transfers the sample values of three-phase current and three-phase voltage, 2, the device computes the theta of the double side voltage based on their sample values when the voltages of both sides are larger than the designed threshold, 3, one side shifts theta of the AC voltage sent by the opposite, then the voltage phases applied by the two-side test instruments are equal, therefore, a unified voltage phase primary standard is set up for the AC output of the instruments, 4, the protection device takes the voltage phasor phase of the two sides as the primary standard of the current phase to adjust the current phase, and a relay protection device can rectify the phase between the voltage and current of its side to carry out the test for protecting both ends, 5, triggering the two-end test.

The invention discloses an in-loop test system and method of impedance hardware of a double-fed blower fan. The system comprises an electric and electronic real-time simulation platform; the electric and electronic real-time simulation platform establishes a real-time digital simulation model including an electrical network, a small signal voltage source for impedance test, a shafting of a wind turbine generator system, a motor and a main circuit, a protective circuit and filtering branches of a current transformer; the real-time digital simulation model is made real-time and then downloaded into a simulator of the electric and electronic real-time simulation platform; and a controller of the to-be-tested double-fed blower fan is connected with the real-time digital simulation model via an input and output interface of the simulator. According to the invention, in-loop test for the impedance hardware of the double-fed blower fan can be realized flexibly and simply, engineering practicality is approached, and a test result is more accurate.

The present invention discloses a method used for testing a double-cladding gain fiber pump absorption coefficient. The method comprises the steps of (1) selecting a to-be-tested double-cladding gain fiber of which the initial length L0 is not more than 2m, welding the to-be-tested double-cladding gain fiber with a transmitting energy fiber, and coupling a pump light source into an inner cladding of the transmitting energy fiber; (2) cutting the to-be-tested double-cladding gain fiber, and testing the output powers of the pump light of different wavelengths in the pump light source under a test length L1; (3) repeating the step (2) to obtain the output powers of the pump light of different wavelengths when the length of the to-be-tested double-cladding gain fiber is L2, L3......LN separately; (4) finding out the residual pump light power of the light of which the wavelength is to be tested, and testing the pump absorption coefficient of the to-be-tested double-cladding gain fiber to the light of which the wavelength is to be tested. The method of the present invention can eliminate an unstable test result brought by the mode disturbance when the double-cladding gain fiber pump absorption coefficient is tested, and enables the accuracy and precision of the test result to be improved greatly.

The invention provides a single-hole observation device and method for double layers of underground water levels of a karst mountainous area, and belongs to the technical field of water conservancy and hydropower engineering. The above device comprises an inner pipe, a casing pipe and a sealing component, wherein the casing pipe is clung to the hole inner wall of the broken rock mass section of aborehole hole; the inner wall of the casing pipe and the outer wall of the inner pipe are arranged at intervals; the inner pipe comprises an upper end and a lower end, wherein the lower end of the inner pipe extends out of the casing pipe and enters to be below the lowest water level of the lower layer; and the sealing component is sheathed to the inner pipe. The above method is combined with theabove device, and before the above device is installed, a stepped hole is drilled in advance. When the above device and the above method detect double layers of underground water levels, the amount ofboreholes is reduced, a purpose of accurately testing double layers of stable underground water levels of the karst mountainous area is achieved, drilling cost is saved, meanwhile, time for investigation work is saved, and the device and the method have good economic benefits.

The invention discloses a double test section direct current gust wind tunnel. The gust wind tunnel comprises an exit section, a power section, a diffusion section, a first test section, a contractionsection, and a stabilization section. One end of the power section is connected to the exit section connected to the outside world. The other end of the power section is connected to the diffusion section. One end of the first test section is connected to the diffusion section, and the other end is connected to the contraction section. One side of the contraction section is connected to the stabilization section. The diffusion section is provided with a first current adjusting section. A second test section is arranged between the exit section and the power section. A backflow section is arranged between the power section and the second test section. The two ends of the backflow section are provided with second current adjusting sections. The side wall of the backflow section is providedwith an opening and closing door. In two test periods, testing can be performed simultaneously, and the second test period can be closed according to an actual demand.

The invention discloses a double-motor cutting-part loading test device of a roller-type coal mining machine, which belongs to the technical field of a coal mining machine, and the double-motor cutting-part loading test device comprises a tested double-motor cutting part, a connecting lug supporting frame, a planet head supporting frame, a test connecting sleeve, a universal coupler and a torque loading device, one end of the tested double-motor cutting part is connected with the connecting lug supporting frame, the other end is connected with a second planet heat supporting frame, the test connecting sleeve is installed between a first planet head supporting frame and the second planet head supporting frame, the torque loading device is connected with the universal coupler, and a single-motor cutting part is installed between the connecting lug supporting frame and the planet head supporting frame. The double-motor cutting-part loading test device has beneficial effects that the single-motor cutting part is used for substituting the double-motor cutting part to be connected with the torque loading device, and only one set of torque loading device and one corresponding universal coupler are needed, so that the structure is simple, the test cost is effectively reduced, the test installation time can be shortened, the working efficiency can be improved, and an ideal test effect can be achieved.

The invention discloses a device and a method for testing the double contact cyclic shear of a flexibly-tensioned geomembrane and soil. A geomembrane shearing frame is connected with a flexible tensioning system, a motor drives gears to rotate forward and reversely to drive a chain horizontally to move back and forth with the geomembrane shearing frame, the device and the method are used for testing the double contact shear strength of the geomembrane and soil at different cyclic displacements of a simulated geomembrane under the action of normal stress, the chain of the flexible tensioning system is flexibly connected with the geomembrane shearing frame, and the test method can be used to detect the changing curve of the double contact shear strength of the geomembrane shearing frame withshear displacement under different normal stresses and different shear displacement amplitudes in order to obtain the change relationship of the cyclic shear strength and the damping ratio of the contact interface of the geomembrane and soil with the shear displacement.

The invention discloses a double-electric-layer capacitive flexible pressure sensor with an enhanced inclined structure and a manufacturing method. The sensor comprises an inclined microstructure electrode and an electrolyte layer formed by combining a polymer with an ionic liquid. The manufacturing method comprises that an inclined groove imprinting mold is prepared, the inclined microstructure electrode is prepared by a nano imprinting and sputtering deposition method, a working counter electrode and the solid electrolyte are prepared, and the inclined microstructure electrode, the working counter electrode and the solid electrolyte are assembled; and after that the sensor is connected to a capacitance test system, ions in electrolyte layer and electrons in an external circuit are gathered in the contact interface between the inclined microstructure electrode and the electrolyte layer under the voltage effect to form a tested double-electric-layer capacitor, the capacitance is proportional to the area of the interface between the electrolyte layer and the inclined microstructure electrode, the contact area is increased after that the sensor bears a force, and further the capacitance is increased. The sensor has a wide measurement range, and is extremely sensitive within a large pressure range.

Electrical testing system which is mainly used for testing double-sided printed board (DSB) (having terminals which are electrically connected with each other are separately provided on the two sides, respectively) is provided. The system includes a test board which is electrically contacted with the PCB, a test fixture which supports the test board and the PCB, testing probes which output an electrical signal, and a sensor which receives the electrical signal through the PCB and the test board. When the PCB is mounted on the test board, the electrical signal outputted from the testing probes sequentially is transmitted to the test board through the PCB, and based upon whether the sensor receives the electrical signal to thereby determine whether the terminals on the PCB corresponding to the testing probes are under the open circuit or the short circuit condition.

The invention relates to a thermal deformation-discordant single-rotor double-thrust bearing axial force testing method. The method includes the following steps that: a strain electrical measurement technology-based single-rotor double-thrust bearing secondary measurement engine refitting and assembly process is put forward; a two-test temperature deformation uncoordinated amount analysis method is established; a two-test double-thrust bearing total axial force test data analysis method is established; and according to test results, a double-thrust bearing axial force equally-shared assembly process is established. Two thrust bearings both bear an axial force of a rotor; in operation, under the axial force of the rotor, the axial force borne by the bearing II is converted, and the axial force borne by the bearing I is increased compared with an assembly state, and an increase value is affected by the axial clearance of the bearing II, the axial stiffness of the bearing I, and the deformation difference of the rotor and a stator under working temperature; and the rest of the axial force is borne by the bearing II. With the testing method of the invention adopted, thermal deformation-discordance-affected single-rotor double-thrust bearing axial force testing can be carried out directly, and testing is simple, and testing results are accurate and reliable.

The invention discloses a deep ultraviolet light frequency doubling test device and belongs to the technical field of optical non-linear frequency change. The test device comprises: a light source (1)is arranged at an inlet outside a closed dark room (2), and ultraviolet light emitted by the light source (1) enters the closed dark room (2) to form a light path; the closed dark room (2) a vacuum or nitrogen-filled dark room; a sample rack (3) is movably arranged on the light path in the closed dark room (2); a sample storage (4) is arranged at the position, corresponding to the sample rack (3), of one side of the light path, and accommodates one or more samples; one end of a sample control rod (5) is connected with the sample rack (3), and the other end of the sample control rod (5) stretches out of the closed dark room (2); and the sample rack (3) moves between the sample storage (4) and the light path. The sample rack (3) and the sample control rod (5) are movably provided, so that the samples in the closed dark room (2) can be replaced without opening the room, the measuring error is small, and the repeatability and the comparability of the test result are guaranteed.

The present invention relates to a corrosion resistance seamless steel pipe treatment process, which adopts a pipe billet molding treatment, a washing treatment, a pipe material nickel-electroplating treatment, a chromium plating treatment and double tests, wherein the nickel electroplating is performed on the surface of the pipe material, the plating solution comprises 290-300 g/l of nickel sulfate, 43-45 g/l of nickel chloride, and 42-45 g/l of boric acid, the adopted first-stage current is 1200 A, the first-stage time is 3 min, the adopted second-stage current is 2400 A, and the second-stage time is 5 min. With the method, the excellent performance stably meeting the salt spray test of more than or equal to class 7 can be achieved, the use requirement of the special motor vehicle part in the coastal area is met, the substantially technical progress is provided compared with the conventionally-used single hard chromium electroplating, and the corrosion resistance of the motor vehicle part is increased.

The invention discloses a material outgassing rate measuring device based on double-test-chamber gas path conversion. The material outgassing rate measuring device comprises a sample chamber, whereina first test chamber and a second test chamber are arranged at the two sides of the sample chamber; the first test chamber and the second test chamber respectively communicate with the sample chamberthrough a first through hole and a second through hole; the first test chamber is connected with a first vacuum gauge tube; the sample chamber is connected with a second vacuum gauge tube; the secondtest chamber is connected with a third vacuum gauge tube; the first test chamber is connected with a molecular pump and a mechanical pump through an angle valve; the first test chamber is connected with an ion pump through a first insertion plate valve; the second test chamber is connected with the ion pump through a second insertion plate valve. According to the material outgassing rate measuringdevice based on the double-test-chamber gas path conversion, a double-test chamber symmetrical air path conversion structure is used; during the measurement of the outgassing rate of a material sample to be tested, only the vacuum degree value displayed by the same vacuum gauge tube needs to be read for calculation; the errors generated by different vacuum regular pipes in the measuring process are avoided; the measuring precision is high; the uncertainty is small; the measurement lower limit is extended; the measuring range is wide.