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487results about How to "Simple test steps" patented technology

Servo valve test system

The invention relates to a servo valve test system. By adopting a cartridge valve to automatically switch static and dynamic oil lines, the servo valve test system can realize the full automatic one-step test and intelligent analysis of the static properties and the dynamic properties of an electro-hydraulic servo valve, improves the test efficiency of the electro-hydraulic servo valve, and increases the accuracy of the test results. Strictly based on the test standard of the electro-hydraulic servo valve GB / T15623-1995, the whole test method completes all the detection tests of the servo valve, and automatically displays and outputs the test results. The servo valve test system mainly comprises a hydraulic test system, an electrical control system and a data acquisition and processing system, wherein a servo valve to be tested is connected with the hydraulic test system and the electrical control system; a main oil line of the hydraulic test system is automatically switched to the dynamic oil line and the static oil line by a cartridge valve assembly, and the hydraulic test system is also provided with a dynamic cylinder for detecting the servo valve to be tested; and the data acquisition and processing system is connected with the electrical control system and the hydraulic test system.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1

Testing device and method for three-dimensional static stiffness loading of machine tool

InactiveCN102853978AIncrease and decrease loadLarge measuring rangeElasticity measurementControl systemEngineering
A testing device for three-dimensional static stiffness loading of a machine tool comprises a parallel loading mechanism, a spindle interface, a force measuring module, a spindle deformation and displacement measuring device, a bench docking platform and a control system. The parallel loading mechanism is fixed on a bench of the machine tool through the bench docking platform, is connected with the spindle of the machine tool through the spindle interface and the force measuring module, and applies load to the spindle of the machine tool. In addition, the spindle deformation and displacement measuring device is also disposed on the bench of the machine tool. Deformation of the stressed spindle of the machine tool is measured by the aid of a high-precision displacement sensor disposed on the spindle deformation and displacement measuring device, and finally three-dimensional static stiffness of the machine tool is obtained. A testing method for three-dimensional static stiffness loading of the machine tool includes six steps. Three-dimensional static load can be applied to the machine tool for testing of three-directional static stiffness loading for the machine tool. The testing device and the testing method have practical value and promising application prospect in the technical field of machine tool performance testing.
Owner:BEIHANG UNIV

Automatic detecting system of S mode responder

The invention relates to the technical field of ATC responders, and discloses an automatic detecting system of an S mode responder. The automatic detecting system of the S mode responder comprises a control module, a signal processing module and a receiving and sending module, wherein the control module is used for sending inquiry data to the signal processing module, receiving responding data returned from the signal processing module, comparing and analyzing the responding data and originally-stored simulated responding data, and displaying the analyzed results; the signal processing module is used for analyzing and encoding the received inquiry data, then sending the inquiry data to the receiving and sending module, decoding the responding data returned from the receiving and sending module, generating a message format of the inquiry data and then sending the inquiry data to a control module; the receiving and sending module is used for achieving mutual transmission of signals between the receiving and sending module and the responder, and achieving frequency conversion, receiving and sending of the signals. According to the automatic detecting system of the S mode responder, accuracy detecting can be conducted on the specific field of the responding information of the S mode responder, manual detecting errors can be reduced, complex testing steps can be simplified, the testing period can be shortened, and working efficiency can be improved.
Owner:SICHUAN JIUZHOU ELECTRIC GROUP

River and lake bottom sludge pollutant flux test method and device based on diffusion theory

ActiveCN102590479AWide applicabilityThe concentration of pollutants does not need to be testedEarth material testingTesting waterSludgeSample water
The invention discloses a river and lake bottom sludge pollutant flux test method and a river and a device based on a diffusion theory. The method comprises the following steps of: A, acquiring a bottom sludge sample; B, putting the bottom sludge into a base of an experimental device, and enabling the sludge surface to be horizontal; C, slowly injecting water to a column port along a column wall; D, injecting running water into the experimental device without the bottom sludge; E, standing for a certain time; F, measuring the pollutant concentration of the taken water sample; G, calculating a degrading coefficient of the pollutant in the water; H, calculating an initial concentration value of the bottom sludge water; and I, calculating a pollutant exchange flux of a water-sludge interface. A base plate is fixed at the bottom of a constant-temperature water tank; a base wall is arranged on the base plate; a lower flange disk is arranged on the upper part of the base wall; an upper flange disk is arranged at one end of a column body; and an upper flange disk fixing bolt flange hole is formed in the upper flange disk. The method is feasible, and is convenient to operate; the experimental device has a rational and simple structure; operations of accommodating deposits, sampling water samples and the like are extremely convenient; and outstanding economic benefit is achieved.
Owner:WUHAN UNIV

Device and method for measuring voltaic arc pressure distribution and current density distribution

The invention relates to a device and a method for measuring voltaic arc pressure distribution and current density distribution, belonging to the technical field of voltaic arc testing. The device comprises a motor, a positioning frame, a guide rail fixed on the positioning frame, a sliding element mounted on the guide rail, a welding torch position regulating mechanism arranged at the lower end of the sliding element, a flat table surface arranged below the positioning frame, a container positioned on the flat table surface, anode plates arranged in the container, and a weighting sensor. During the measurement, the motor drives a guide screw to rotate so as to further drive a welding torch to move along a direction vertical to an insulating material. The values of voltaic arc force and voltaic arc current which are applied on the two anode plates are collected. Then, a mathematic model, which is about the value of the voltaic arc force and circle domain pressure distribution of the voltaic arc and about the value of the voltaic arc current and circle domain current density distribution of the voltaic arc, is established. Solving is carried out next. Then, curves about the circle domain pressure distribution and the circle domain current density distribution of the voltaic arc can be drawn. The device and the method realize the simultaneous measurement of the microcosmic voltaic arc pressure distribution and the microcosmic voltaic arc current density distribution. In addition, the device has a simple production process, and the testing steps are simple.
Owner:BEIJING UNIV OF TECH

Method and system for progressive additional lens detection based on optical coherence tomography

The invention discloses a method and a system for progressive additional lens detection based on optical coherence tomography. The method includes: indirectly obtaining a three-dimensional image of a progressive additional lens by means of optical coherence tomography, working out the curvature radius of each point of a curved surface and thickness information of corresponding positions, and calculating to obtain optical characteristic parameters of the progressive additional lens according to known refractive index parameters in materials; and on the other hand, surface shape precision of the actual progressive additional lens can be evaluated according to the obtained three-dimensional image. A scanning detection system comprises a system light source, an optical fiber coupling and interference unit, a reference arm unit, a sample arm unit, a signal detection unit, a PC (personal computer) and a control circuit. By the method and the system for progressive additional lens detection based on optical coherence tomography, detection of optical characteristic parameters of the progressive additional lens can be realized while measurement of the whole surface of the progressive additional lens can be further realized. In addition, the method and the system for progressive additional lens detection have the advantages of high measurement resolution and precision, high reliability of measurement results, low cost and the like.
Owner:UNIV OF SHANGHAI FOR SCI & TECH

Hybrid test method based on vector finite element and FPGA

The present invention discloses a hybrid test method based on a vector finite element and an FPGA. The method comprises the following steps: dividing a to-be-analyzed structure into a numerical sub-structure and an experimental sub-structure; establishing a numerical model in an FPGA by using a parallel computing technology and adopting a vector finite element; writing an external compensation controller in the FPGA by using a control theory of feed-forward plus feedback; designing I / O in the FPGA to implement conversion and transfer between a numerical computation amount and an experimental simulation amount; running an FPGA hardware program regularly by using a LabVIEW real-time module; transferring data between FPGA hardware and a host computer by using FIFO; setting up a displacement loading device of the experimental sub-structure and establishing a connection with an I / O module of the FPGA hardware; and in the host computer, establishing a data communication interface between the host computer and an FPGA hardware terminal, so as to realize visualization of experimental data. The method provided by the present invention can effectively solve the problem of excessive computing pressure caused by numerical sub-structure calculation in a hybrid experiment, and is particularly suitable for a hybrid experiment in which a numerical sub-structure has a large number of computing degrees of freedom and requires real-time operation.
Owner:ZHEJIANG UNIV

Method for rapidly judging structure type of asphalt concrete

The invention discloses a method for rapidly judging the structure type of asphalt concrete. The method comprises the following steps of: molding a full-gradation Marshall specimen according to the gradation of asphalt concrete to be evaluated, or coring from an asphalt pavement so as to obtain a cylinder sample of the pavement; cutting the specimen or the sample and taking a picture of the section of the specimen or the sample with a digital camera to obtain an image of the section; acquiring an area ratio n1 of coarse aggregate in the image of the section to the section by image processing software; according to the proportion of the coarse aggregate part in the gradation of asphalt concrete to be evaluated, compacting the Marshall specimen for molding coarse aggregate asphalt macadam and obtaining an area ratio n2 of coarse aggregate in the section of the specimen to the section; if n1 is smaller than n2, judging that the asphalt concrete is of a suspending type structure; if not, judging that the asphalt concrete is of a skeleton type structure. The method is mainly used for rapidly judging the structure type of the asphalt concrete; the method not only brings convenience for engineering technicians to preferably select the gradation of aggregate, but also can be used for controlling the construction quality of the asphalt pavement.
Owner:HOHAI UNIV

Bidirectional volumetric buoyancy adjusting device and testing device and method thereof

The invention discloses a bidirectional volumetric buoyancy adjusting device which comprises a main body fixing cylinder, adjusting modules and a control module. The adjusting modules are used for adjusting the drainage volume of the buoyancy adjusting device, and the adjusting modules comprise a first adjusting module and a second adjusting module; the first adjusting module and the second adjusting module have the same structure and are symmetrically arranged on the main body fixing cylinder; the first adjusting module and the second adjusting module work independently. The buoyancy of the device can be changed under the condition that the gravity center is not changed through independent or common cooperative work of the first adjusting module and the second adjusting module, the gravity center of the device can also be adjusted under the condition that the buoyancy is kept unchanged, the buoyancy can be continuously adjusted after the gravity center is adjusted, and double and continuous adjustment of the buoyancy and the gravity center is achieved. And the device obtains high stability underwater, and is suitable for a complex underwater working environment. The invention further discloses a testing device and a testing method for testing the bidirectional volumetric buoyancy adjusting device.
Owner:JIANGSU UNIV OF SCI & TECH

Quantitative evaluation test method for coal core damage

The invention discloses a quantitative evaluation test method for coal core damage. According to the method of the invention, a triaxial loading system is used for applying confining pressure and porepressure to the coal rock core; the axial strain of the matrix of the coal core is recorded in real time through a strain gauge; the overall axial displacement of the coal core is recorded through adisplacement sensor; volume strain generated by the microcrack evolution of the coal core can be obtained through calculation; and due to the fact that the volume strain is closely related to a damagedegree, the damage variable of the coal core can be quantitatively calculated according to a continuous medium damage mechanics theory; a permeability change rule in a damage process is measured in real time according to a pulse attenuation method; the permeability change rule is compared with the calculated damage variable, so that a corresponding relation between damage and permeability can bedirectly established. According to the test method of the invention, required equipment structures and test steps are simple; and the calculation method is accurate and visual. The test method has definite physical significance, and can be used for the quantitative evaluation of damage variables and permeability evolution in experimental processes such as cyclic pulse air pressure permeability increase, creep deformation damage, and triaxial compression.
Owner:CHINA UNIV OF MINING & TECH

Detection method of no-clean particulate matter concentration as well as sampling apparatus and sampling device

ActiveCN104964891AReduce the difficulty of manual cleaningAvoid manual cleaning difficultiesWithdrawing sample devicesWeighing by absorbing componentComputer scienceCarbon tetrachloride
The invention relates to the technical field of the sampling of particulate matters in catering lampblack waste gas, and particularly to a detection method of no-clean particulate matter concentration as well as a sampling apparatus of the no-clean particulate matter concentration and a sampling device of the no-clean particulate matter concentration. The method detects the concentration of the particulate matters on the basis of a weighing method by adopting the detachable sampling apparatus; the sampling apparatus comprises a first half shell, a second half shell and a lampblack filter core; the lampblack filter core is arranged in a cavity formed by the first half shell and the second half shell; the lampblack filter core comprises a first membrane structure and a second membrane structure. The sampling device comprises the sampling apparatus. The problems that the traditional test method is not suitable for detecting the particulate matter concentration of the catering lampblack, the workload is large, the sampling apparatus is difficult to clean manually, a great amount of chemical reagents such as tetrachloromethane are used, the test is inaccurate, and the like can be solved.
Owner:BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION

Measurement device and measurement method for interface heat exchange coefficients and material heat conductivity

ActiveCN110018193AGuaranteed one-dimensionalityAchieve precise measurementsMaterial thermal conductivityElectricityMeasurement device
The invention discloses a measurement device and a measurement method for interface heat exchange coefficients and material heat conductivity. According to the measurement device, a heating componentis fixedly arranged outside one end of a box, a heating cavity of the heating component is communicated with an inner cavity of the box, a cooling water tank is arranged inside the other end of the box, a sample component is arranged in the box and located between the heating component and the cooling water tank, and heat insulation between the sample component and the side wall of the box is realized through an annular thermal-insulating layer; one end of an air inlet / outlet pipe extends into the heating cavity of the heating component, and the other end of the air inlet / outlet pipe extends out of the box and is connected with the outside environment and a pressure air source respectively through a three-way valve; an air pressure sensor in the heating cavity of the heating component anda pressure sensor on a pressure driver of the cooling water tank are in signal connection with a pressure signal collection module; a temperature collection element on the sample component is in signal connection with a temperature signal collection module; and the pressure signal collection module and the temperature signal collection module are electrically connected with a control module respectively. The device is used for measuring heat conductivity, a solid-solid interface heat exchange coefficient and a solid-liquid interface heat exchange coefficient.
Owner:SHANGHAI UNIV OF ENG SCI
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