17results about How to "Improve test repeatability" patented technology

The invention discloses a tunnel-pile interaction experiment method and device based on a 3D printing technology, and belongs to the technical field of civil engineering underground structure tests. The method comprises the steps that the geometric and mechanical similarity ratio is determined according to an engineering prototype, a tunnel lining model and a pile group model are prepared through the 3D printing technology, and controllable adjustment of the rigidity of the tunnel model is achieved by adjusting the type, the filling rate and the internal structure of a printing material; controllable adjustment of the rigidity of the pile foundation model is realized by adjusting the size of the magnetic field; the model is placed in a soil body groove, the shield tunnel excavation process is simulated, and deformation data of a tunnel and a pile foundation are collected through a PIV technology and a sensor. Accurate control over the rigidity of the tunnel and pile foundation model is achieved through 3D printing, the influence of shield tunnel construction on the pile group foundation can be simulated under the condition that the similarity criterion is met, and the device has the advantages of being adjustable in structure, high in experiment efficiency and the like and can be used for researching a dense urban area tunnel-pile deformation coupling mechanism and optimizing related engineering parameters.

This invention discloses a continuous conductivity testing bench for lubricating grease and its testing method. The test bench includes a grease pump, a conductive base plate, a heating module, and an upper conductive plate. It can continuously measure the dynamic conductivity of the lubricating grease before and after breakdown and before and after blockage at a preset temperature, calculate the average conductivity during the continuous thickness change process, and conclude that the grease thickness is different when breakdown and blockage occur. It obtains the accurate values ​​of the grease thickness in the test area corresponding to each breakdown and blockage. In the blockage analysis, the volume of the grease to be injected into the test area is calculated by integration. Based on the instantaneous volume flow rate detected by the elliptical gear flow meter, the actual volume of the grease to be injected into the test area is calculated, and the flow rate of the grease pump is adjusted to ensure that the difference between the volume of the grease to be injected into the test area and the actual volume of the grease injected into the test area is within a preset range. This avoids the pressure changes caused by insufficient grease thickness or excessive grease affecting the test accuracy.

The application discloses a kind of gap water pressure measurement and geometric condition regulation method and test device, it is related to hydraulic engineering technical field.The box, side plate, lower bottom plate and other components of the test device of the application are formed into airtight gap structure containing vertical joint and bottom joint, and are sealed with test flume docking;Sensor elements are arranged in multiple regions of the gap and are connected to collection terminals through threading holes;Through three types of assembled movable blocks, the gap water inlet angle, gap width and downstream ridge height can be adjusted;After the geometric boundary is determined by the three types of movable blocks, the test flume is regulated to form a stable working condition, and the water pressure data of the gap in multiple positions are collected simultaneously;The force in each partition is calculated according to the partition pressure and the pressure area, and the overall lifting force of the structure is obtained by difference operation;After a single working condition is completed, the accumulated water is drained, the movable blocks are replaced without disassembling the main body of the device, and the cycle test is completed to compare and test multiple geometric working conditions.The application realizes the regulation and measurement of the water pressure of the gap in multiple working conditions without changing the main structure, and has a high application value.

The invention belongs to the technical field of offshore wind power foundation engineering tests, and discloses a multifunctional indoor piling test device for offshore wind power steel pipe piles, which realizes indoor simulation and contrast tests of various steel pipe pile sinking modes by arranging a static pressure pile sinking device, an excitation pile sinking device and a power piling device on the same test platform. The systematicness and comparability of the test are improved; through structural cooperation of the support sliding rail and the equipment sliding rail, overall displacement of a test area is achieved, and resetting of soil body conditions and repeated testing are facilitated; a displacement sensor, a pressure sensor and an acceleration sensor are integrated in a pile cap, the displacement change, the stress state and the dynamic response in the pile sinking process of the steel pipe pile are synchronously monitored, and a reliable data basis is provided for pile sinking mechanism analysis and key parameter research; through the synergistic effect of the servo control system and the information acquisition system, controllable loading and state dynamic correction in the pile sinking process are achieved, and the stability and controllability of the test process and the reliability of the result are enhanced.

This invention relates to the field of testing technology for servo hydraulic cylinders used in rolling mills. The invention provides a testing system and device for servo hydraulic cylinders used in rolling mills. An internal pressure sensor is installed in the rodless chamber of the cylinder, including an air source assembly for supplying compressed air. The output end of the air source assembly is equipped with a gas pressure reducing valve for adjusting the gas pressure. One end of a gas-liquid converter is connected to the gas pressure reducing valve, and the other end is connected to the rodless chamber of the cylinder. The end of the gas-liquid converter connected to the rodless chamber is filled with hydraulic oil for supplying oil to the rodless chamber of the cylinder so that the internal pressure sensor can obtain liquid pressure parameters. A displacement detection component is installed on the piston rod of the cylinder for detecting the movement state of the piston rod and generating a displacement signal. The controller is electrically connected to the gas pressure reducing valve, the internal pressure sensor, and the displacement detection component. This invention solves the technical problem of low minimum starting pressure accuracy in existing purely hydraulic cylinder testing technologies.

This invention discloses a multi-pulse loading nonlinear response amplification test device and method for explosive structures, relating to the field of structural and material response simulation technology under impact loads. It includes a loading section and a structural response section. The loading section includes a projectile A, which has a large-diameter end and a small-diameter end. A projectile B is disposed outside the small-diameter end of projectile A, and a projectile C is disposed outside projectile B. An adjusting ring B is disposed at the end of projectile B near the large-diameter end of projectile A, and an adjusting ring C is disposed at the end of projectile C near the large-diameter end of projectile A. The masses of projectiles A, B, and C are equal. The structural response section includes a limiting block and a mass block, with a force transmission rod disposed between the limiting block and the mass block. The mass block has a loading through-hole and a mounting hole for the force transmission rod. This test device can achieve loading pulses of no less than 3 times, explosive pressure on the order of hundreds of MPa, and pressure amplitude amplification of approximately 1.9 times, with a short test cycle and low cost.

The utility model discloses a tensile testing technical field's thermoplastic material tensile detection device, including, shell, clamping component, temperature control assembly, motor and screw rod, be provided with baffle in the shell, divide the shell into upper chamber and lower chamber, clamping component sets up in the upper chamber for clamping thermoplastic material sample, motor sets up in the lower chamber for driving the rotation of screw rod, drives the movement of a part in clamping component, temperature control assembly is used for adjusting and maintaining the constant temperature inside the upper chamber, the utility model discloses adopt upper and lower clamping main body cooperation trapezoidal groove structure, and combine the linkage clamping mechanism of rotatable connecting plate and clamping block, through telescopic link control clamping block along the sliding of inclined plane, realize the adaptive clamping of sample, make clamping block have the same clamping force, through the replacement into the clamping block of same size with sample size, can effectively prevent the sample clamping slip or clamping break problem caused by uneven clamping force, improved the reliability and test repeatability of clamping.

The invention provides a test fixture for testing an image sensor chip, and aims to solve the problems of poor imaging consistency, limited site layout and the like caused by stray light generated by reflection and refraction of light on the surface of a structural member in an existing structure. The through straight hole is formed in the structure between the light source and the lens, and the transparent light guide piece is embedded in the straight hole, so that illumination light is transmitted in a unique and stable path. The material and the shape of the light guide piece can be freely selected according to requirements so as to adapt to different spectral characteristics and light source positions. The light enters the dodging part and the lens system after being directionally transmitted by the light guide part, and the middle does not contact the surface of a surrounding structure, so that stray light is effectively prevented from being generated, and the illumination uniformity and imaging consistency of each test position are remarkably improved. Due to the fact that the light path is strictly limited, the scheme is not limited by the field angle of the lens any more, the site distance can be reduced, a plurality of test positions can be flexibly arranged, the number of testable points in unit area is increased, and therefore the test efficiency and the throughput capacity of a production line are improved. The probe card is simple in structure, convenient to process and high in adaptability, can be directly applied to an existing probe card system, and has good popularization value.

This invention discloses a loading device and method for loading misalignment faults in an elastic support-rotor system, relating to the field of support misalignment loading tests. The loading device includes a test bench, a support assembly, a drive assembly, and a load adjustment mechanism. The support assembly is mounted on the test bench. The adjustment mechanism can be detachably installed at at least two spaced connection positions on the connecting frame to change the direction of the force transmission component and maintain the bearing's force on the rotor, thereby adjusting the direction of the force acting on the misaligned support. This invention can adjust the loading force and direction of the misalignment, and can effectively simulate and test rotor faults under conditions close to actual working conditions, providing a scientific basis and support for the design and performance of rotor systems. Its implementation process is convenient, maintains good misalignment accuracy, and exhibits good test repeatability.

The utility model belongs to the technical field of powder metallurgy bearing testing, and particularly relates to an automobile motor powder metallurgy bearing vertical friction performance testing device which comprises a bottom plate. A mounting through hole is formed in the center of the bottom plate, and a servo electric cylinder is arranged on one side of the top surface of the bottom plate; a telescopic shaft of the output end of the servo electric cylinder is connected with a push block. The other end of the push block is connected with a tension seat; a test part is arranged on the tension seat, the center of the tension seat is arranged at the mounting through hole of the bottom plate, a driving part is arranged at the lower part of the tension seat, and the driving part is used for cooperating with the test part to test the performance of the to-be-tested bearing together. According to the utility model, the testing component and the driving component are matched for use, so that different loads can be increased for testing according to testing requirements, the testing repeatability and accuracy are greatly improved, the testing is more time-saving and labor-saving, the time cost is reduced, and the product development efficiency is improved.

The invention discloses a memory, and a chromaticity determination method and device for a paraffin product. The method comprises the following steps: determining absorbance of three preset wavelengths by using a spectrophotometer so as to obtain tristimulus values of standard colorimetric solutions; according to the tristimulus value of each standard colorimetric solution, respectively calculating the chromatic aberration value of each standard colorimetric solution; generating a prediction model by taking the chromaticity and the chromatic aberration value of each standard colorimetric solution as modeling data; the prediction model takes the color difference value as input and is used for predicting a corresponding chromatic value; obtaining a tristimulus value of the paraffin product to be measured by using a spectrophotometer; calculating a chromatic aberration value of the paraffin product to be measured according to the tristimulus value of the paraffin product to be measured; generating a chromatic value of the to-be-measured paraffin product through the prediction model by taking the chromatic value of the to-be-measured paraffin product as input; according to the invention, manual workload and manual subjective errors can be greatly reduced, so that the efficiency and accuracy of paraffin chromaticity detection are improved.

The utility model relates to instrument detection device technical field provides a kind of instrument fracturing detection device, including fender, fender outer surface rotationally connected with first gear, servo motor, fixed installation is in fender outer surface, servo motor output shaft is fixedly connected with the outer surface of first gear, the outer surface of first gear is engaged with two second gears, fender inner surface rotationally connected with two drive lead screws, device sets up the structure of the stable pressure exertion to the instrument to be detected, avoid the instantaneous impact and stress concentration during pressure loading process, avoid the uneven local deformation of the instrument to be measured, premature fatigue and even rupture of internal structure, device can accurately assess the pressure resistance limit and reliability of instrument, avoid pressure fluctuation to cause detection table vibration to lead to sensor misjudgment or equipment displacement, improve test precision and repeatability, design the structure of the protection when instrument is pressed, improve device detection efficiency and use safety.

The utility model discloses a visual high-temperature foam performance testing device which comprises a gas transmission system, a constant-temperature circulating system, a shooting system and a foam performance evaluation system, and the gas transmission system is connected with the foam performance evaluation system through a bottom valve of a double-layer chromatographic column at the bottom; and the constant-temperature circulating system is connected with the foam performance evaluation system through a connector on the left lower side and a connector on the right upper side of the double-layer chromatographic column. The visual high-temperature foam performance testing device is connected with a constant-temperature circulating system to analyze the performance of high-temperature foam. The constant-temperature circulating system is composed of a constant-temperature water bath box, a water pump and a high-temperature-resistant silicone tube, and uniform heating of the double-layer chromatographic column is achieved through jacket water circulation. High-purity distilled water is used in the water bath box, heat stability is guaranteed, the total cost of components is far lower than the price of a high-temperature foam analyzer adopting an airflow method in the market, and low-cost and efficient temperature control is achieved.

The application provides a waveguide transmission line structure-based nonlinear characterization method for wave-absorbing sheet materials and a related device, and belongs to the technical field of radio frequency passive intermodulation testing. The application repeatedly performs an assembling step and a testing step until testing of all to-be-tested wave-absorbing sheets is completed; whether the reflection PIM of more than a set number of wave-absorbing sheets is lower than the sensitivity of a receiving system is judged; if yes, the input power is increased by a step in a set range until the PIM amplitude of the wave-absorbing sheet is located in a PIM testing system testing threshold value; the wave-absorbing sheets without testing results are retested, the assembling step and the testing step are repeatedly performed, and all to-be-tested wave-absorbing sheets are distinguished until the intermodulation level is obtained. The application solves the problem that the accuracy of nonlinear characterization of wave-absorbing sheet materials is not high.

The application relates to a battery current probe multi-point synchronous detection structure and a rapid testing method thereof, and belongs to the technical field of battery current probe detection. Two current probes correspond to first and second current connection terminals respectively, and the two terminals are electrically isolated. The axial movable cooperation of the current probe and the probe fixing part and the elastic compression of the elastic part enable the compression process to have stroke compensation capability. The axial through hole of the current probe is integrated with the voltage probe combination part, so that voltage sampling can be arranged in the same body as the large-current probe and a stable sampling channel can be established under the same compression action, sampling errors caused by large-current wire voltage drop and connection state changes are reduced, and the temperature measuring part is arranged close to the contact end face, so that the problems that the single connection interface of the existing single-screw-column large-current probe in the hundreds-of-ampere battery test causes contact resistance fluctuation, is prone to heat and has poor adaptability, and it is difficult to simultaneously consider voltage sampling and contact area temperature acquisition under one-time compression are solved.

The application discloses a method for quantitatively testing the content and embedded granularity of organic carbon in gold ore, and belongs to the technical field of gold ore detection. The method comprises sample preparation and quantitative testing. The sample preparation uses palm wax as a cementing agent and barite as a standard sample, and the sample to be tested is prepared through melting, mixing, solidification, polishing and carbon spraying. The quantitative testing is based on an automatic process mineralogy testing system, the palm wax background is removed through background deduction, a spectrum library is established to identify organic carbon and barite particles, the area ratio of the two is measured, the mass ratio is converted in combination with the density ratio, the content of organic carbon in the raw ore is inversely calculated, and the granularity distribution of the organic carbon is counted. The application solves the problem that the prior art cannot simultaneously accurately quantify the content and granularity of organic carbon, has the advantages of high testing precision, high efficiency, comprehensive parameters and simple operation, and can provide key data for optimizing the cyanide leaching process of gold ore.

The invention discloses an annular structure interface shear test device and method considering fluid viscosity, the annular structure interface shear test device comprises a shear cylinder, loading plates, a test tube, a connecting tube, a displacement outlet tube, a counter-force tube, a hollow jack and a tension and compression sensor, a sample bin is enclosed between the two loading plates, and a loading bin is enclosed between the loading plates and end covers on the same side; stable sealing of fluids with different viscosities in a high-pressure environment is realized through a plurality of matched sealing structures, and actual engineering annular structure interface forms of pile soil, pipe soil and the like are accurately matched through an annular cavity structure, so that annular structure interface direct shear tests of various rock and soil samples under different consolidation pressures, different fluid viscosities and different hydraulic conditions can be realized; in the shearing process, the interface occurrence environment is highly matched with an engineering site, the problem that the mechanical parameters of the viscous fluid-containing annular structure interface cannot be accurately tested is effectively solved, and data support is provided for research on the mechanical characteristics of the annular structure interface in geotechnical engineering such as sea reclamation and waterlogged soft foundation treatment.