38 results about "Indirect test" patented technology

The invention discloses a method for simulating a load test with transformer substation bus differential protection current. A heavy-current device is utilized to replace a power transmission power supply to be accessed between a main transformer earthing isolating switch and a main transformer current mutual inductor; an outgoing earthing isolating switch is utilized to simulate load; a heavy-current device three-phase wiring zero line is grounded to simulate different faults of one phase and faults between phases. The invention can replace a load test of a bus differential current loop and can simulate fault states and change the traditional transformer substation bus differential protection current loop indirect test methods. The transformer substation double-bus differential protection current loop, a relative breaker, the isolating switch and a current mutual inductor control operation loop are precisely simulated before power is transmitted, and a bus differential protection normal running state and fault state are simulated well so as to ensure that the protection current loop is in a correct state before the power is transmitted. Defects which can be possibly found in transformer substation load test are eliminated. The invention is more accurate, safer and more reliable.

The invention relates to a device and method for testing the torsional rigidity and mode of shafting, and belongs to the field of rigidity and mode test. In the device, a mass disc is bonded to the free end of a shaft to be tested, additional square blocks are bonded to the two sides, opposite to each other, in the side arm of the shaft to be tested respectively, and accelerometers are mounted onthe additional square blocks respectively. The device is easy to realize, convenient to operate and high in test precision, and fills the blanks in the field of torsional rigidity and mode test of theshafting. According to the method, the characteristic that the additional square blocks can act torsional moment excitation and test response of the tested shaft in the torsional direction is used, the mass disc is used to change the mass characteristic of the shaft, the torsional rigidity and moment of inertia of the tested shaft are calculated, the torsional rigidity and mode measured by the method can reflect the torsional oscillation characteristic of the shafting visually, and the method further has the advantage of high precision.

The invention belongs to the technical field of microbubble performance test and relates to a microbubble performance test and assessment experimental platform and a test and assessment method thereof. The microbubble performance test and assessment experimental platform is characterized in that a scum collection tank is arranged at the top of a flotation column, a bottom backflow gate valve is connected with a microbubble generation device which generates an air-liquid mixture of microbubbles and water, and the air-liquid mixture is injected to the lower portion of the flotation column through a backflow water distribution unit; a microbubble particle size test sampling port is connected with a laser particle analyzer through a sampling tube and a sample adding controller, and the laser particle analyzer is connected with a computer. The test and assessment method includes: according to a direct test and assessment method, completing online test of microbubble particle size distribution conditions by the aid of the laser particle analyzer and the computer; according to an indirect test and assessment method, injecting waste water into the flotation column, allowing part of bottom waste water to flow back into the flotation column through the microbubble generation device, and testing pollutants in different axial heights of the flotation column to complete indirect test and assessment. By the microbubble performance test and assessment experimental platform and the test and assessment method thereof, test and assessment of various microbubble generation techniques and product performances can be realized.

The invention discloses a processing method and processing system of a DDR (Double Data Rate) test waveform data file. The processing method of the DDR test waveform data file comprises the following steps: S1, carrying out traversing on an original data file of all DDR test waveforms and forming a tree-like list; S2, carrying out format conversion on the original data file and screening by adopting a first parameter; taking screened data as direct test data; S3, converting the direct test data into indirect test data by adopting a second parameter; S4, comparing the direct test data and the indirect test data with corresponding standard evaluation data respectively. The processing method and processing system of the DDR test waveform data file, disclosed by the invention, can be used for automatically extracting data from the DDR test waveform data file; a testing result is automatically judged and a testing report is automatically output, and the reliability is high.

The invention discloses an indirect strain rate dynamic tensile load testing method applicable to metal materials. The method comprises steps as follows: Step 1, a test piece is mounted on a high-speed hydraulic servo material tester, wherein strain gauges are pasted in corresponding positions of two sides of a non-test section at the lower part of the test piece; Step 2, a dummy gauge is mounted in the same position, where the strain gauges of the test piece are mounted, of a non-test piece, and the non-test piece and the test piece form a Wheatstone full-bridge circuit; Step 3, a dynamic tensile test is conducted on the test piece; Step 4, parameters of the strain gauges, the Wheatstone full-bridge circuit and the test piece are acquired; Step 5, strain of the non-text section at the lower part of the test piece is acquired; Step 6, the tensile load of the test piece in the dynamic tensile test process is acquired through formula calculation. The method has the advantages that the inertia effect of a static clamping fixture is eliminated and the resonant frequency of a testing system is not coupled into test data.

The invention discloses a device and a method for indirectly testing the performance of a fire detection tube. A medium capable of generating high pressure gas is filled in a gas bottle of the device; one end of the tested fire detection tube is connected with the outlet of a pressure regulating valve, and the other end of the tested fire detection tube is sealed by an end connector; a test section at the center of the fire detection tube is fixed on a fixed plate; a cover plate is arranged on a test box; the fixed plate is positioned on the test box; a part of the fire detection tube on the fixed plate is soaked into the liquid medium; a timer is arranged on the lateral surface of the test box below the fixed plate; a heat source is arranged at one side of the test box and is completely soaked into the liquid medium; and a temperature testing element is arranged on the test box and is arranged in the liquid medium. The invention realizes the purpose of conveniently and accurately regulating the test pressure; when the fire detection tube is broken, gas can overflow out of the liquid medium and can not pollute the liquid medium; the indirect method which uses the liquid medium for simulating the heating environment in the working process of the fire detection tube has the advantages of high control accuracy of test temperature, simple structure, safe operation and low cost; and the device can be used as standard equipment to be popularized and used.

The invention discloses a method for inversely calculating parameters of a super-large-diameter shield tunnel segment joint. By comparing a test result of an existing reduced-scale model and a test result of a full-scale model, tunnel segment joint mechanical parameter correction coefficients of the two different scale models of the diameter are obtained, and according to the linear relation, the coefficients are applied to reduced-scale test results of other super-large-diameter shield tunnels for inversely calculating design parameters of the corresponding super-large-diameter shield tunnel lining joint. The method has the advantages that the existing test results are fully utilized, by means of an indirect test mode, the segment joint mechanical parameters of full-size tests of shield tunnels with the different diameters can be derived, the situation that large-diameter full-size tests are directly carried out is avoided, and the method brings remarkable economic benefits; for the obtained mechanical parameter correction coefficients, test errors caused by the different diameters and different reduced-scales can be avoided relatively.

The invention relates to an indirect test evaluating method for the hollowness of a bombax cotton fiber. The indirect test evaluating method comprises the following steps of: manufacturing corresponding samples according to the shapes and types of products; testing by use of a compression tester of a fibrous material, measuring a relation curve of pressure and the thickness of the samples in a compression process and a relation curve of pressure and the thickness of the samples in a reset process to obtain a characteristic index so as to evaluate the hollowness state of the fiber; and carrying out calculation and result analysis according to the characteristic index. According to the indirect test evaluating method disclosed by the invention, on the premise of not breaking the original structure of product, compressible thickness and filling power are converted by directly testing the compression performance index of the bombax cotton fiber so that the hollowness state of the bombax cotton fiber in the product is indirectly and effectively evaluated. The indirect test evaluating method disclosed by the invention not only is simple, easy and feasible, but also can be used for avoiding the secondary deformation of the hollow structure of the bombax cotton fiber caused by a section observation method.

The invention discloses an indirect test method for voltage drops on relay contacts in power control, relating to a relay test technique. In the method, the test can be performed from the outside of a device without opening a case, contacting internal circuits and producing potential safety hazards, and the test can be implemented just by arranging a simple test circuit at the outside of the device and then connecting the simple test circuit with the device by virtue of a connector. The indirect test method for the voltage drops on relay contacts in power control disclosed by the invention is accurate and credible in test results, and safe and convenient in test process.

The invention discloses a method for testing apparent characteristics of a road aggregate. The method comprises the steps of cleaning a to-be-tested aggregate, drying the cleaned to-be-tested aggregate, and putting the dried to-be-tested aggregate in a sealed drying box for cooling; imaging the aggregate under a high-magnification camera through an aggregate image measurement system (AIMS); calculating a sphericity index SP for representing a three-dimensional shape of the aggregate; calculating an angularity index GA of the aggregate to represent an aggregate size and a contour change feature; and calculating a texture index TX of the aggregate to represent a surface texture of the aggregate. According to the new method provided by the invention, the apparent characteristics of the tested aggregate are all obtained by an instrument, so that errors generated due to subjective factors of test personnel in an indirect test method and a direct test method are effectively avoided, the time of the test personnel is saved, and the test efficiency is greatly improved.

The invention discloses an indirect test method for explosion-proof pressure of a metal battery shell, and aims to provide an indirect test method for explosion-proof pressure for realizing the measurement of the explosion-proof pressure by quantitatively detecting the residue thickness of an explosion-proof valve with high test speed, high accuracy and no damage to the metal shell. The method comprises the following steps: carrying out regression analysis for the explosion-proof pressure of the metal battery shell and the residue thickness of the explosion-proof valve to obtain a fitted equation of the residue thickness of the explosion-proof valve and the explosion-proof pressure of the battery shell; measuring the residue thickness of the explosion-proof valve of the metal battery shell to be tested; and inserting the residue thickness of the explosion-proof valve of the metal battery shell to be tested into the fitted equation of the residue thickness of the explosion-proof valve and the explosion-proof pressure of the metal battery shell to obtain the explosion-proof pressure of the metal battery shell to be tested. The method of the invention belongs to indirect and non-destructive test, and has no damage to the metal shell. And the method has the advantages of high measurement speed for the residue thickness, high accuracy, good test repeatability for the explosion-proof pressure, neat test environment and convenient measurement.

The invention relates to an unsaturated soil variable structure suction testing device, in particular to an unsaturated soil variable structure suction direct testing device, and belongs to an innovative technology in the field of unsaturated soil variable structure suction testing devices. The unsaturated soil variable structure suction testing device comprises two parts, namely a sample preparation device and a testing device, wherein the sample preparation device is composed of two semi-cylindrical molds, the degree of tightness of the molds is controlled through three outer clamps outside, and a micro soil sample can be manufactured. After the soil sample is manufactured, short plastic pipes with slightly larger diameters sleeve two ends of the soil sample, are adhered to a force transferring plate together with the soil sample, and then are placed in the testing device as shown in accompanying diagrams. Load application is carried out by slowly adding water, the total weight of the upper half part of a broken soil body, the force transferring plate on the top and water in a water container is tested after the soil sample is broken. According to the unsaturated soil variable structure suction testing device disclosed by the invention, the variable structure suction under different degrees of saturation can be directly tested, and the difficulty that the variable structure suction is tested by an indirect testing manner only at present is avoided.

The invention aims at providing an indirect testing method for equipment to excitation load of a hull structure under vertical unbalance excitation force. The indirect testing method comprises the following steps of: installing a first group of vibration isolators on feet of tested equipment, and installing both the tested equipment and the vibration isolators on a rigid mass block; distributing an accelerator sensor at the feet of the tested equipment and at the top of the vibration isolators, and sequentially connecting a signal amplifier and a signal collection instrument; starting the test equipment and calculating the speed response value under the first group of vibration isolators; replacing the vibration isolators, and calculating the speed response value under a second group of vibration isolators, thus obtaining the turbulence force equivalent mass of the tested equipment. The tested equipment is arranged on the vibration isolators and then installed on a hull base which is equivalent to a spring and the rigidity mass block, thus finally obtaining the excitation force load of the tested equipment to the hull base. The indirect testing method is good in accuracy, simple and convenient as well as easy to operate, and high in controllability.

The invention discloses an indirect testing method of the purity quotient of miglitol, comprising the following steps: 1) the miglitol to be tested is taken as substrate, and acetic anhydride is taken as acetylation reagent to have acetylation reaction, so that esterification reaction liquid containing acetic acid-beta-(3, 4, 5-triacetyl oxygroup-2-acetoxyl methyl-1-piperidine)-ethyl ester is obtained; or the miglitol to be tested is taken as substrate, propionic andydride is taken as acetylation reagent, and acetylation reaction is carried out under the catalysis of anhydrous pyridine, so that the esterification reaction liquid containing the acetic acid-beta-(3, 4, 5-triacetyl oxygroup-2-acetoxyl methyl-1-piperidine)-ethyl ester is obtained; 2) gas chromatography is carried out on the esterification reaction liquid, and the retaining time and the peak area of all the components in gas chromatograph can be obtained; after the peak area of the light components is eliminated, the purity quotient of the obtained miglitol is calculated according to normalization method. The indirect testing method has the characteristics of simple testing method and accurate testing result.

The invention discloses a method for indirectly measuring spring rigidity of a linear compressor and mover mass. The method comprises the following steps: connecting acoustic load in an outlet of the compressor to pressurize the whole system; determining at least two groups of incompletely-equivalent acoustic impedance imaginary parts and angular frequency data under the condition that the acoustic impedance real parts of the acoustic load are ensured to be unchanged; combining resonance conditions of the compressor; and calculating to obtain the spring rigidity and the mover mass, wherein the angular frequency data is angular frequency corresponding to highest electro-acoustic conversion efficiency of the compressor. Compared with the prior art, the method has the beneficial effects that: on the premise of not disassembling the linear compressor, an indirect test is performed on the compressor, the test method is simple and easy to operate, and damages, caused by disassembling the compressor, to internal structural parts of the compressor are avoided.

The invention relates to an identification method of electromagnetic excitation load of a motor, which belongs to the field of structural acoustic design of electric motors, is suitable for identification of electromagnetic excitation load in structural acoustic design of electric motors and can be used for frequency characteristic analysis of electromagnetic excitation load of electric motors. The steps include: determining the equivalent method of the electromagnetic excitation load, measuring point arrangement, transfer function test, working condition response test and load identification. The invention has the advantages of improving the accuracy of identification of the electromagnetic excitation load of the motor, overcoming the difficulty of test installation in the traditional indirect test method, and considering the distribution characteristics of the electromagnetic excitation force with time and space, realizing the identification of the electromagnetic excitation load of the motor, etc. Efficiency calculation and frequency characteristic analysis, guiding the structural acoustic design of the motor, is a method for identifying the electromagnetic excitation load of the motor that is simple to test and install.

The invention relates to a method for quickly analyzing punching crack defects of an ultra-deep drawing steel plate. The method comprises the following steps: taking the center point of a steel platecut for forming as the center of a circle, dividing into N fan-shaped regions uniformly, equally dividing the center line of each fan-shaped region into M parts, measuring the hardness value of each equipartition point at each equipartition point, then calculating hardness extreme deviation and influence factors, finally judging the possibility of punching crack defects or ear-making defects in the steel plate; both N and M are integers. The method for quickly analyzing the punching crack defects of the ultra-deep drawing steel plate has the advantages that the strength of the steel plate canbe indirectly evaluated through detecting the hardness and the hardness detection is high in speed and less in time consumption, furthermore, the hardness detection of each point for the steel plate is performed and the 'microscopic' strength of each point is indirectly tested, so that the anisotropy trend of the formed steel plate is quickly tested, thereby saving time, being high in efficiency,and further saving resources.

The invention discloses an SRAM read and write indirect testing device and an SRAM read and write indirect testing method based on LabVIEW, which are used for solving the technical problems that a testing interface for the existing direct reading and writing SRAM is not friendly and the control configuration for the direct reading and writing SRAM is not flexible. An FPGA circuit module is used for receiving SRAM signal parameter data sent from a serial port; a tested chip IS61LV10248 circuit module is used as a tested object; an SRAM read and write indirect testing control panel module basedon the LabVIEW is used for compiling a front panel human-computer interface; a write operation control command module is used for executing SRAM write operation; a data reading command module is usedfor executing SRAM read operation; an underlying serial port driving module is used for performing data interaction. The invention has the beneficial effects as follows: the testing interface is simple and intuitive, and a user interface can be created very conveniently; timing parameters are convenient to adjust; the integration is high, the reliability is good, and the external interference is less.