78results about How to "Low test environment requirements" patented technology

The invention discloses an underwater acoustic measurement method for scattering properties of a ship target broadband radar, which is characterized by comprising the following steps of: firstly, inversely arranging a scaled model of a measured ship target in an anechoic tank, regulating basic conditions of a measurement device and a modeling test, simulating irregular sea waves at an interface between the scaled model of the ship target and water, amplifying a linear frequency demodulation signal generated by a signal source and radiating the amplified frequency demodulation signal in a sonic signal manner, amplifying and filtering an echo output signal reflected by the scaled model and then storing, then acquiring a plurality of groups of echo signal data on each rotating angle and then storing; and finally, processing the echo signals of the scaled model of the measured ship target on different rotating angles by adopting a pulse compression technology to obtain one-dimensional distance image data of the measured ship target. The invention overcomes the defects of rigorous requirements on measurement equipment and environment and incapability of measuring sea-surface target characteristics in the prior art, and has the advantages of flexibility in the measurement method, low cost, easiness in realization and the like.

The invention discloses a method for determining a rock crack stress threshold value based on full-field strain measurement. The method comprises the following steps: manufacturing a rock sample; performing speckle treatment on the surface of the rock sample; carrying out test loading and collecting an image of a speckle surface of the rock sample in the test loading process; calculating the full-field displacement of the speckle surface of the rock sample; calculating the full-field strain of the speckle surface of the rock sample; calculating a volume strain, an elastic volume strain and a crack volume strain of the rock sample; acquiring a rock sample volume strain-axial strain curve, a crack volume strain-axial strain curve and an axial stress-axial strain curve, and drawing the curvesin the same subgraph; and determining changing rules of the volume strain of the rock sample and the crack volume strain and determining threshold values of the four crack stresses including the crack closing stress, the crack initiation stress, the crack damage stress and the peak stress of the rock sample. The method has the advantages of low requirement on test environment, more convenience inapplication, high result reliability, and higher representativeness and universality.

The invention discloses a linear acceleration sensor for a bionic-ear stone implement structure, and the acceleration sensor comprises a rigid housing, a flexible elastic body, a plurality of parallel piezoelectric fibers comprising metal cores, a rigid element pasted at the top of the flexible elastic body, and an elastic element connected with the rigid element and the external rigid housing, wherein the piezoelectric fibers are fixed at the bottom of the grid housing. The symmetric electrodes of the piezoelectric fibers are led out through two wires, and the two wires are respectively connected to the positive and negative electrodes of an input end of a charge amplifier. The whole sensor is fixed on a vibration exciter. When the vibration exciter vibrates up and down, the elastic element stretches and withdraws and drives the rigid element. At this moment, the flexible elastic body will deform, and the piezoelectric fibers will also deform elastically. Moreover, the piezoelectric fibers in the flexible elastic body will obtain an impact signal. Because of the piezoelectric effect, surface electrodes on a piezoelectric material will generate charges. Because the positions of electrodes are different, the charges generated on the electrodes or the voltages are different. Therefore, the acceleration information can be obtained through the collection of the charge signals on the electrodes and the data processing and analysis.

The invention relates to a method for measuring the cohesiveness of cement-based building mortar, belonging to the field of cement mortar performance detection. The method is suitable for detection of the building mortar, particularly the building mortar prepared by various types of machine-made sand. The method comprises the following steps of A, preparing the mortar; B, measuring the water use amount of the mortar; and C, measuring the expansion degree of the mortar. According to the measurement method, the target thickness meeting the requirement of actual production is firstly determined by virtue of measurement on the water use amount of the mortar; then the aim of estimating and controlling the cohesiveness of the building mortar is fulfilled by measuring the expansion degree of the mortar, so that a standard support for supplying mortar suitable for building site construction can be achieved in actual production; meanwhile, the operability of directly and objectively estimating the cohesiveness of the mortar can be improved.

The invention relates to a nondestructive testing method and a nondestructive testing device for a crack of a metal part. The nondestructive testing method for the crack of the metal part comprises the following steps of (1), connecting the two ends of a to-be-tested part with a direct-current power supply, and enabling an infrared lens of an infrared thermal imager to face the to-be-tested part; (2), selecting the time and the size that the to-be-tested part is subjected to the direct-current power according to the dimension and the material property of the to-be-tested part and a position where the crack damage exists, and electrifying the to-be-tested part; (3), after the electrification of the to-be-tested part is completed, observing and imaging the electrified to-be-tested part through the infrared thermal imager, showing that the crack does not exist in the to-be-tested part if an imaged image is in a same color, and showing that the crack exists in the to-be-tested part if the imaged image is in different colors. As a circumferential motion effect and a Joule heating effect are adopted for the nondestructive testing method and the nondestructive testing device for the crack of the metal part, higher temperature rises can be automatically generated at the position of a crack tip by both the circumferential motion effect and the Joule heating effect, and the position of the crack damage of the part is easily and accurately determined. In view of reasons above, the nondestructive testing method and the nondestructive testing device for the crack of the metal part can be widely used for the field of the nondestructive testing of metal cracks.

The invention discloses a control system and method suitable for a micro-nano detection and processing module. The system includes a micro-nano dual-mode detection and processing module, a three-coordinate workbench, a PZT driver, a UMAC, a charge amplifier, a lock-in amplifier, an XY piezoelectric scanning bench, a router, an upper computer, a CCD, an XY-direction displacement sensor, and a Z-direction displacement sensor. The UMAC is selected as a control core, and characteristics of a high-performance servo ring, high scalability and a high integration degree are adopted to realize macro-micro linkage control. An analog signal mode is adopted to ensure real-time performance of signal processing and transmission, and a design requirement is satisfied. A capacitive displacement sensor signal is amplified, phase locking processing is performed, and the signal is served as a closed-loop control reference signal, a test result is accurate and the requirement to a test environment is low, and muN-level closed-loop control can be realized. Through usage of the lock-in amplifier, a noise signal in the capacitive displacement sensor test result is eliminated, which facilitates closed-loop precision control.

The invention discloses a channel performance test system and method for a satellite navigation anti-interference baseband chip. The channel performance test system comprises a navigation signal simulator and a test evaluation unit, wherein the navigation signal simulator comprises a signal simulation unit and a control unit, and the control unit is used for generating or receiving externally input simulation and control parameters and sending the simulation and control parameters to the signal simulation unit and the test evaluation unit; the signal simulation unit is used for generating a digital baseband signal of a satellite according to satellite navigation simulation and control parameters and sending the digital baseband signal to the anti-interference baseband chip through an optical fiber; and the test evaluation unit is used for receiving the positioning calculation information output by the anti-interference baseband chip, comparing the positioning calculation information with the simulation and control parameters, and judging the channel performance of the anti-interference baseband chip. The invention further discloses a test method which is used for the system. The method has advantages of improving the test efficiency and the test accuracy, reducing the test cost and the like.

The invention discloses an NTC heat-sensitive chip testing method, and belongs to the field of electronic component preparation. The NTC heat-sensitive chip testing method comprises the steps of testing to acquire a benchmark product and a limit product in the same batch of products to be tested and calculating to acquire deviation between the benchmark product and the limit product, connecting the benchmark product and the limit product to a thermistor tester at the normal temperature so as to be tested and comparing the benchmark product and the limit product to acquire a percentage deviation value, setting a resistance range of qualified products in the thermistor tester, and carrying out constant temperature treatment on a product to be tested and the benchmark product in a normal temperature environment and connecting the thermistor tester to test, wherein if the resistance of the product to be tested meets the set range, the product to be tested is a qualified product. The method disclosed by the invention converts a test for an NTC heat-sensitive chip in an oil tank/ water tank environment to a test in a normal state environment, requirements for the test environment are low, the NTC heat-sensitive chip is tested directly without loading or unloading a fixture in the testing process, the test process is simplified, the test efficiency is improved, and the test speed is about 8 times of the test speed of an oil tank testing method.

The invention discloses a dirt detection method for a projection device. The dirt detection method comprises the following steps of acquiring a projection image of a second projection device at a first projection distance, obtaining first dirt information corresponding to the projection image, converting the first dirt information into second dirt information corresponding to a second projection distance according to a pre-stored conversion coefficient, the first projection distance being smaller than the second projection distance, and judging the dirt of the second projection device according to the second dirt information. The invention further discloses a detection device and a computer readable storage medium, and the effect of reducing the detection cost is achieved.

The invention relates to a method for detecting light rare earth hydride using non-contact raman spectrum, belongs to the crossing field of material science and substance detection and aims to solve the problem in detection of light rare earth metal hydride and detection of types of surface impurity. The method comprises the step of putting the light rare earth metal hydride which needs to be detected into a colorless and transparent bottle, adding a dispersant subjected to anhydrous and anaerobic treatment into the bottle, and sealing; performing scan detection by using a raman spectrometer, removing the sealed bottle and characteristic peak of the dispersant to obtain a spectrogram peak curve and data of the light rare earth metal hydride; then comparing with a curve and the peak value of the standard raman spectrum of the corresponding light rare earth metal oxide and light rare earth metal hydride, and determining substance types of related major impurity in a sample to be detected. The method provided by the invention is convenient for detection, easy to operate, high in accuracy, safe and reliable in detection process, low in requirements on testing environment, simple in sample preparation and low in economic cost.

The invention discloses a method for realizing a data verification test of a large-capacity SSD on a small memory machine, which comprises two parts of random data writing and data verification, during random data writing, the storage mode of an LBA sequence is determined according to a mode parameter in command parameters, when the mode is equal to 1, a low-configuration test machine is encountered, the LBA sequence is not recorded, when the mode is equal to 2, the LBA sequence is stored in a local file, and when the mode is equal to 3, the LBA sequence is stored in a memory through a bitmap; in the data verification process, an LBA sequence is generated, and different verification modes are adopted according to the mode of storing the LBA sequence in the data writing process. The SSD equipment data consistency testing method effectively meets the requirement for SSD equipment data consistency testing with the industry content increasing continuously, the requirement for a testing machine is low, the testing efficiency and quality are improved, and the testing cost is effectively reduced.

The invention relates to a method for analyzing the content of unsaturated acids in a liquid phase mixture by gas chromatography. The unsaturated acids in the liquid phase mixture include acrylic acid and acetic acid. The method comprises the following determination steps: firstly, determining the total acid molar concentration in a to-be-tested liquid by an acid-base titration method; then determining the content of acrylic acid and acetic acid by the gas chromatography; and finally measuring the molar concentration of acrylic acid. The determination method has the advantages of low cost, simple and convenient operation, low requirements on a test environment, no need of large-scale analysis equipment, simple and rapid method, accurate determination results and good repeatability.