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1356results about How to "Reduce experimental error" patented technology

Computed tomography (CT) scanning heterogeneous model testing system

The invention relates to a computed tomography (CT) scanning heterogeneous model testing system. The system comprises a CT scanning system, a displacement system, an overburden pressure system, a pressure measurement system, a heterogeneous multilayer core clamp holder and a metering system, wherein the heterogeneous multilayer core clamp holder consists of a shell, a rubber cylinder, a core left plug, a core right plug, a left fixing sleeve, a right fixing sleeve, a left fastening sleeve, a right fastening sleeve and a fixed bracket; the core right plug is provided with a plurality of liquid outlets; each liquid outlet is respectively aligned with one layer of core model; and a strip liquid outlet sealing gasket is formed on the core right plug, which correspond to a seam between two adjacent layers of core models, so that liquid flow passing through each layer of core model flows out from the corresponding liquid outlet of each layer of core model, and thus, intraformational heterogeneous water displacing oil layered measurement is realized. By the CT scanning system, the real-time on-line monitoring of the on-way distribution of saturation of fluid on each layer section in a heterosphere is realized so as to observe the interlayer communication phenomenon.
Owner:PETROCHINA CO LTD

Quick multi-wavelength tissue optical parameter measuring device and trans-construction method

The invention belongs to the field of optical parameter measurement in tissue optics research, and relates to a multi-wavelength tissue optical parameter trans-construction method based on a neural network. The method comprises: using double integrating sphere technology and a high-sensitivity photoelectric detector to collect reflected light and transmitted light on the surface of a tested sample, and using a method of relative measurement to obtain the reflectivity, diffuse transmittance and collimation transmittance of the sample; using a Monte Carlo method to establish a mapping model of a tissue optical parameter (mua, mus and g) to a measurement amount (Rd, Td and Tc); establishing a BP neural network containing two buried layers, and adopting a gradient descent weight learning function to train a BP network; and predicting the optical parameter of the measured sample through the (Rd, Td and Tc) obtained by measurement in real time, wherein an input signal of the neural network is (Rd, Td and Tc), and an output signal is (mua, mus and g). The invention provides a device adopted by the method at the same time. The method provided by the invention can quickly and accurately measure the tissue optical parameters under multi-wavelength.
Owner:TIANJIN UNIV

Expansive-soil slope hygroscopic deformation model experiment method and system

The invention discloses an expansive-soil slope hygroscopic deformation model experiment method and a system. The expansive-soil slope hygroscopic deformation model experiment method comprises following steps: A, soil samples are turned and subjected to sun drying so as to control water content and soil filling thickness; B, soil filling is carried out by layers, slope cutting is carried out uniformly, and a part of monitoring components are buried; C, an obtained soil slope is allowed to stand until cracks are generated, and a displacement sensor is arranged; D, physical quantity initial values are recorded; E, a rainfall simulator is used for realizing dropping-pouring type concentrated rainfall, and rainfall amount is controlled; F, physical quantities and rainfall amount are monitored according to rainfall stages; G, a rainfall-evaporation cycle is carried out repeatedly so as to stimulate drying and watering cycle; and H, slope morphologic change is recorded, and results are analyzed. The system comprises a model case, monitoring components, and a rainfall simulator; the monitoring components are arranged in the model case; and the rainfall simulator is arranged on the upper part slope shoulder of the model case. The expansive-soil slope hygroscopic deformation model experiment method and the system are suitable for a plurality of expansive-soil slope hygroscopic deformation model experiments, and possess significant importance for researches on expansive-soil slope stability and catastrophe mechanisms.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI

High-temperature micro-nano press mark test device and method in vacuum environment

The invention relates to a high-temperature micro-nano press mark test device and method in vacuum environment, and belongs to the field of mechanical and electronic integration precise instrument. The device can be used in vacuum environment; the oxidization caused by high-temperature environment on a press head and a test specimen can be prevented; the influence of air flowing on the test specimen heating is weakened; the stable heating temperature of the test specimen is ensured; further, the test analysis on the test specimen micro mechanical properties can be started; the characteristics parameters and the like of material hardness, elasticity modulus, creep properties and thermo-mechanical coupling effects are obtained so as to study the influence rule of variable-temperature and high-temperature environment on the material micro mechanical behaviors, deformation damage mechanisms and micro tissue structure evolution; the material and product design manufacturing, service prediction and reliability evaluation are guided. The structure of the device is compact; the measurement precision is high; the application range is wide; the wide application prospects are realized in the fields of material science, equipment manufacturing, ferrous metallurgy, national defense and military, aerospace and the like. According to the test method provided by the invention, the rich material micro mechanical property test theories and technical systems are combined.
Owner:JILIN UNIV

Reaction device for simulating migration and transformation of soil organic pollutant

The invention discloses a reaction device for simulating migration and transformation of a soil organic pollutant, relates to a reaction device, and solves the problem that existing leaching experiment equipment for simulating the migration and transformation of the soil organic pollutant is large in experimental error, low in equipment use ratio and poor in adaptability The reaction device comprises a first water box, a second water box, a water pump, a water inlet pipe, a steady flow pipe, a support, a supporting frame, a base, a fixed plate, a first regulating valve, a second regulating valve, multiple flowmeters, multiple sieve hole plates, multiple earth pillars and multiple fifth regulating valves, wherein the first water box, the support and the supporting frame are all arranged on the base; the fixed plate is connected with the supporting frame, and the second water box is supported through the supporting frame; the supporting frame is provided with the multiple earth pillars which are vertically arranged, each flowmeter is arranged right above each earth pillar, the multiple flowmeters are fixedly arranged on the fixed plate, and the sieve hole plates are fixedly arranged on the support. The reaction device disclosed by the invention is used for simulating the migration and transformation of the soil organic pollutant.
Owner:NORTHEAST AGRICULTURAL UNIVERSITY

System and method for recognizing rolling guide rail joint surface dynamic characteristic parameters

InactiveCN102012305AOutstanding stiffnessProminent damping coefficientVibration testingData processing systemSystems design
The invention discloses a system for recognizing rolling guide rail joint surface dynamic characteristic parameters and a control method. The system has a double-guide rail connecting plate symmetric structure; a normal compression device and a tangential compression device are prevented from rigid contact, so that the recognition of normal and tangential dynamic parameters in different pre-compression states is realized; a base consists of an experimental bench and a replaceable adjusting block corresponding to a corresponding rolling guide rail set; the experimental bench is provided with an O-shaped groove or symmetric notch structure; the replaceable adjusting blocks with different specifications are connected with the experimental bench at the same mounting position; each group of replaceable adjusting blocks are symmetrically arranged on the experimental bench, and one side of each of the replaceable adjusting blocks is pressed against a notch machining side face on the experimental bench to ensure parallelism of the replaceable adjusting blocks and position the replaceable adjusting blocks; a multi-guide rail, multi-connecting plate and single degree-of-freedom system design is realized on one experimental bench in different pre-compression states, so that the normal and tangential joint surface parameters are recognized; and the influence on an experimental device is eliminated. The reliable control method and a data processing system ensure that the experimental system is more perfect.
Owner:BEIJING UNIV OF TECH

Test method for porosity of asphalt mixture, and apparatus thereof

The present invention relates to a test method for porosity of an asphalt mixture, and an apparatus thereof. With the present invention, the volumes of the pore with an opening and the pore with a semi-opening can be determined. The test apparatus mainly comprises a sealed container, a pressurization device of the sealed container, a hydraulic cylinder, a water pump and a flow control valve. The sealed container is provided with a pressurization piston. A piston rod of the hydraulic cylinder is connected with the pressurization piston arranged inside the sealed container. The flow control valve is connected between a water inlet of the sealed container and the water pump. The test method comprises that: a specimen is sealed with a thin film, and is placed in the sealed container; with thehydraulic cylinder, the piston inside the container is pushed, such that the air pressure in the container is increased to more than two standard atmospheric pressures; water is slowly injected to the container until the height of the water is the preset height, and the water injecting amount is recorded as L1; the specimen is taken, and the thin film is removed, then the specimen is placed in the container again; under the same air pressure condition, water is slowly injected in the container, and the water injecting amount is recorded as L2; the difference between the two water injecting amount is the amount that the water enters the inner pores of the specimen, and the porosity of the specimen can be calculated, wherein the difference is calculated by the following formula, L2-L1.
Owner:西安公路养护技术工程研究中心有限公司

Non-homogenous multi-layer core holder for CT (computed tomography) scanning

The invention relates to a non-homogenous core holder for CT (computed tomography) scanning. A rubber cylinder is arranged in a shell; a core left top and a core right top arranged in the rubber cylinder and push against two ends of a multi-layer core mold; a core containing chamber which accommodates the multi-layer core mold is defined by the inner wall of the rubber cylinder, the core left top and the core right top; a left fixed sleeve and a right fixed sleeve are respectively sleeved on the core left top and the core right top; an enclosed annular confining pressure space is defined by the outer wall of the rubber cylinder, the left fixed sleeve, the right fixed sleeve and the inner wall of the shell; the shell is provided with a confining pressure interface, a confining pressure exhaust hole and a confining pressure discharging hole; the core left top is internally provided with a liquid inlet and a core exhaust hole; and the core right top is internally provided with a middle-layer liquid outlet, an upper-layer liquid outlet and a lower-layer liquid outlet. The holder can detect the on-way distribution of fluid saturation in each layer section in a non-homogenous layer on line in real time, and also can observe fluid channeling among layers.
Owner:PETROCHINA CO LTD

Automatic amplitude modulation frequency scanning method for airplane servo elasticity frequency response test

ActiveCN103558843AAvoid violent reactionsImprove the signal-to-noise ratio of the loop response signalElectric testing/monitoringAdaptive controlAeroelasticitySignal-to-noise ratio (imaging)
The invention belongs to the field of airplane aeroelasticity tests, and relates to an airplane ground test scope, in particular to an automatic amplitude modulation frequency scanning method for an airplane servo elasticity frequency response test. Control plane overloads are fed back to automatically adjust a frequency scanning amplitude value, on the premise that safety of a control pane structure is guaranteed, control plane deflection exciting force of all frequency scanning points is kept maximum so that sufficiently large airplane structure response can be excited, the signal to noise ratio of a response signal of an airplane-flight control combined circuit is improved, test errors are reduced, and reliability of a test result is improved. Meanwhile, the adjusting process of an excitation signal amplitude value is controlled through construction of a hyperbolic tangent-exponent function, violent response of a control plane caused by sudden changes of the excitation signal amplitude value is prevented from happening in the process of frequency scanning, and safety of the control plane structure is ensured. In addition, the advantages of a real-time simulation system of a computer are brought into full play, in the process of the test, people only need to slightly click a mouse, so that parameters such as control limit overloads and excitation signal cycles can be adjusted, and the automatic amplitude modulation frequency scanning method is high in practicability.
Owner:XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA

Test platform for testing creep property of geosynthetic material

The invention discloses a test platform for testing the creep property of a geosynthetic material. The test platform comprises a test stand, a test box, a vertical loading device, a slide bearing device, a horizontal loading device, a left clamp, a right clamp, a sensor and a control system, wherein the test box is filled with soil; the slide bearing device comprises two slide rods horizontally mounted on the test stand and a slide sleeve in sliding fit with the slide rods, a bottom plate is horizontally mounted at the top of the slide sleeve, the test box is fixedly mounted on the upper surface of the bottom plate, a loading frame is further arranged on the bottom plate, the vertical loading device is fixedly mounted in the middle of the loading frame, the left clamp and the right clamp are symmetrically mounted on two sides of the test box, the right clamp is connected with the sensor through a pull rod, and the left clamp is connected with a power end of the horizontal loading device. The test box is filled with the soil, a to-be-tested geosynthetic material is located in the soil, creep conditions of the geosynthetic material under soil restriction/lateral confinement conditions can be simulated realistically, and the test precision is improved.
Owner:SHIJIAZHUANG TIEDAO UNIV

Preparation device of random oriented multi-set joints rock bridge samples and method thereof

The invention discloses a preparation device of random oriented multi-set joints rock bridge samples. The preparation device comprises I-shaped guide rails, a dead plate, L-shaped supports, angle control devices and insert devices. The lower part of the preparation device is composed of two parallelly-arranged pairs of I-shaped guide rails and rod pieces. A square formed by the I-shaped guide rails and the rod pieces has the same inner diameter as a sample box. The L-shaped supports are nested in the I-shaped guide rails. The angle control devices are fixed on the L-shaped supports. The insert devices are fixed on the angle control devices through fastening screws. Thus, all the above components together form a basic structure of the device. In comparison with the prior art, the invention has the following advantages: the device is practical and simple, and can manufacture multi-sets of joints; manufactured samples can be used in direct shear tests and true triaxial tests; and the device is convenient to use, has high precision and high practicability, and is adopted to achieve objectives of really stimulating joints, enhancing work efficiency, reducing experimental errors, optimizing test results and solving practical engineering problems.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Measurement method for seawater total nitrogen content

The invention belongs to the field of sea water quality standard measurement, and particularly relates to a measurement method for water total nitrogen content in seawater culture. Firstly, absorbance of standard liquid is measured, and the steps of measurement include that after the potassium nitrate standard liquid is diluted by means of diluents, alkaline potassium persulfate solutes are added for oxidation, the mixing liquid is heated and then cooled, digestion products are obtained, hydrochloric acid solutes are added into the digestion products, the digestion products are diluted by diluents after being dissolved, the absorbance is measured by means of an ultraviolet spectrophotometer, and a standard curve is drawn according to an adjusted value of the absorbance. Then a seawater sample is measured according to measurement steps of the absorbance of the standard liquid, the value of the absorbance is obtained, and eventually the total nitrogen content in the sample is calculated according to the standard curve. Compared with a measurement method for seawater in the prior art, the measurement method omits a middle conversion process, measurement steps are simple, convenient, quick and precise, and measurement time is 2.5 hours shorter than that of an existing measurement method. According to the measurement method, reagent variety is few, used amount of reagents is little, and measurement cost is saved.
Owner:FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI

Novel device for pseudo tri-axial creep of rock and earth engineering test block and using method of device

InactiveCN103196746AGuaranteed constant readingPrevent pressure changesMaterial strength using tensile/compressive forcesCompression deviceAmbient pressure
The invention relates to a novel device for pseudo tri-axial creep of a rock and earth engineering test block and a using method of the device. The novel device comprises a plurality of surrounding steel plates which surround a rock-earth test block, wherein each surrounding steel plate is connected with a spring vertical compression device with adjustable pressure; a longitudinal loading device with adjustable pressure is arranged at the top part of the rock-earth test block; a pressure sensor is arranged between the spring vertical compression device and the surrounding steel plates; the pressure sensor and the loading device are connected with a control device; and the spring vertical compression device is connected with the longitudinal loading device. By adopting the novel device, a plurality of inconveniences in experiments in the prior art are avoided; and the spring pressure is simple, is easy to achieve and is convenient to adjust; through compressing the spring by a rotary screw, a large amount of complex mechanical control of the current devices are avoided, and therefore the experiment efficiency is greatly improved; the deformation in a creep process is relatively slow, the light error caused by the slight extension of the spring is avoided by adjusting the rotary screw in time, and therefore the experiment accuracy is guaranteed; and by adopting the pressure sensor, the creep ambient pressure is kept constant, and therefore the accuracy of a low-intensity pseudo tri-axial creep test is guaranteed.
Owner:SHANDONG UNIV

Direct shear test data acquisition instrument for big visual model of reinforced earth

The invention relates to a direct shear test data acquisition instrument for a big visual model of reinforced earth. The direct shear test data acquisition instrument comprises a vertical loading system, a horizontal loading system and a shear box, wherein the shear box comprises an upper shear box and a lower shear box which are both filled with packing; the horizontal loading system comprises a push-pull electromotor and a sliding balanced pushing rod, and a displacement sensor and a pressure sensor are mounted on the push-pull electromotor; one end of the sliding balanced pushing rod is connected with the push-pull electromotor, and the other end of the sliding balanced pushing rod is connected with the lower shear box; a counterforce device is mounted on one side, far away from the sliding balanced pushing rod, of the lower shear box and connected with the upper shear box; transparent tempered glass is arranged on one side wall of the upper shear box in the shear direction, and a digital video camera is mounted in front of the tempered glass; a geotechnical material spring clip is mounted at one end of the lower shear box. The direct shear test data acquisition instrument is convenient to use, small in test error, precise test data and convenient to widely promote and use.
Owner:GUANGXI UNIVERSITY OF TECHNOLOGY

Device and method for carrying out in-situ testing on transport properties of conductor materials at high temperature and high pressure

The invention discloses a device and a method for carrying out in-situ testing on the transport properties of conductor materials at high temperature and high pressure, and belongs to the field of high-pressure science and technologies and material science technologies. In the device, four copper wires (4) are introduced to a side face of a high-temperature and high-pressure synthetic assembling block and used as electrodes for measuring the resistivity, two pairs of thermocouples (10) are introduced for measuring seebeck coefficients, and welding points of a sample (5) and the electrodes as well as the sample (5) and the thermocouples (10) are fixed by using a pressure generated by a high-temperature and high-pressure device. The resistivity of the sample is calculated through measuring relative resistance values RA and RB and the thickness d of the sample subjected to pressurization; the seebeck coefficient of the sample is calculated through measuring a potential difference Vef between positive poles of the two pairs of thermocouples and a potential difference Vhg between negative poles of the two pairs of thermocouples. The method disclosed by the invention is simple, easy to implement, high in success rate, and good in experimental repetition rate; a problem that wires and the thermocouples are easy to fracture at the high pressure is solved; a situation that measured electrical signals are interfered by heating current is prevented, thereby ensuring the accuracy of results.
Owner:JILIN UNIV

Stairwell fire simulation experimental apparatus of super high-rise buildings

The invention provides a stairwell fire simulation experimental apparatus of super high-rise buildings. The experimental apparatus comprises an experimental apparatus body, a pressurized air supply system, and a supporting measurement and control system. The experimental apparatus body comprises a stairwell, a front chamber and a room construction structure which are corresponding with actual multi-story buildings or super high-rise buildings and are undersize; and the experimental apparatus body is built by steel tubes and formed by welding and sealing steel plates, and refractory glass is adopted for the front face and the right side face. The air output of the pressurized air supply system can be adjusted, thus being capable of fully carrying out studies on a series of fundamental theoretical problems and practical engineering problems in fume flow and control of the super high-rise buildings; a large number of high-temperature glass viewing windows and aided viewing systems are adopted in the experimental apparatus, thus being capable of clearly observing the real-time phenomenon of the fume movement; and a methanol plus incense coil missing fume mode is adopted for fire source selection, thus ensuring safety and cleanness during the whole experimental process and being capable of actually simulating real fire. The stairwell fire simulation experimental apparatus of super high-rise buildings has wide application prospect in design and test evaluation of the fire pressurized air supply system of the super high-rise buildings.
Owner:UNIV OF SCI & TECH OF CHINA

Heating device for Hopkinson compression bar test

The invention discloses a heating device for a Hopkinson pressure bar test, which comprises a movable supporting platform, a tubular heating furnace and an electric control box. The tubular heating furnace is mounted on a sliding plate of the movable supporting platform. Two groups of sliding rails and a plurality of fixed sliding beads are arranged on the upper surface of the sliding plate. Two alundum tubes are symmetrically sleeved at two ends of a heat-resistant steel tube. Heat-resistant bricks are respectively built around the external surfaces of the joints of the two alundum tubes and the heat-resistant steel tube. The heat-resistant bricks are provided with through holes for mounting silicon carbide rods. Insulating linings are sleeved on the external surfaces of a hearth and the heat-resistant bricks. Positions where inner cavities of the insulating linings correspond to the through holes on the heat-resistant bricks are all provided with mounting holes of the silicon carbide rods. Aluminum silicate fibrous carpets package the external surfaces of the insulating linings. A furnace shell is packaged on the external surfaces of the aluminum silicate fibrous carpets and the insulating linings. A base is fixed on the furnace shell. Two heat-insulating covers are respectively mounted in the hearth from hearths at two ends, and end cover bolts are fixed at two ends of the furnace shell. In the invention, the tubular heating furnace can move in the up-and-down direction, the leftward-rightward direction and the frontward-backward direction of the platform, and the heating device has the characteristics of good heat-insulating performance and convenience in repair.
Owner:AIR FORCE UNIV PLA

Fast and accurate detection method for silicon dioxide content in limestone, kalk and dolomite

ActiveCN103728261AConducive to complete dissolutionImprove stabilityColor/spectral properties measurementsOXALIC ACID DIHYDRATEAscorbic acid + ferrous sulphate
The invention discloses a fast and accurate detection method for silicon dioxide content in limestone, kalk and dolomite. The detection method comprises the following steps: crushing samples, and drying for 1.5-2.5 h under thea temperature of 105-110 DEG C; mixing 0.1000 g samples and 3.0-4.0 g mixed fluxing agent of sodium carbonate and boric acid evenly, liquating for 18-20 min under athe temperature of 890-910 DEG C, dissolving frits by a 45-55 ml hydrochloric acid and 25-35 ml water, and placing the test solution in a 250-ml volumetric flask; taking and adding 5.00 ml test solution in a 100-ml volumetric flask, adding 18-22 ml ammonium molybdate and still standing for 18-22 min, and adding 45-55 ml mixed acid of oxalic acid and sulfuric acid, 4.80-5.20 ml ascorbic acid-ammonium ferrous sulfate mixed solution; measuring the absorbency of a color development solution at the wavelength of 680 nm through a spectrophotometer, and using blank as a reference; preparing a silicon dioxide standard sample with the concentration of 40 ug/ml, moving and taking 0.00 ml, 2.00 ml, 4.00ml, 6.00 ml, 8.00 ml and 10.00 ml silicon dioxide standard samples, and placing the standard samples in 100-ml volumetric flasks respectively, adding 5.00 ml blank test solution in the volumetric flasks respectively, after color-developing, measuring the absorbency at the same conditions, and then drawing a working curve. The silicon dioxide content in the samples is calculated according to the following formula (shown in the specification). The detection method is fast and efficient, excellent in accuracy, reproducibility and stability, and particularly suitable for detection of samples with silicon dioxide content equal to or higher than 4 %.
Owner:WUKUN STEEL
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