7669 results about "Test rig" patented technology

Standard test methods for determining one-dimensional consolidation properties of soils using incremental loading in accordance with ASTM D2435, or AASHTO 216, and of those of other international and organizations, do not accurately predict the values of vertical settlement, coefficients of consolidation in horizontal and vertical directions, and modulus of elasticity in vertical direction, because fixed ring used in these tests do not allow horizontal settlement and dissipation of excess pore-water pressures in horizontal direction, whereas, in field, under application of a vertical load, both horizontal and vertical settlements occur along with dissipation of excess pore-water pressures in both vertical and horizontal directions. To overcome this more than 100 year old problem, the inventor (Dr. Ramesh Chandra Gupta, Ph. D., P.E.) has invented a test device for determining three-dimensional consolidation properties of soils, using a flexible ring which permits development of horizontal and vertical displacements, and dissipation of excess pore-water pressures in both horizontal and vertical directions, along with increased lateral resistance as takes place in field at any depth in a soil deposit when vertical load at the surface is applied.The flexible ring consists of filter fabric around the soil specimen, rubber membrane around the filter fabric, circular segmental metal plates around the membrane and elastomeric rubber bands or spring loaded jacket around the segmental plates, and allows horizontal and vertical displacements, dissipation of pore-water pressures in horizontal and vertical directions to take place with increased lateral resistance with each increment of vertical load like those in the field. Thus new test device simulates field condition to allow accurate determination of three-dimensional consolidation properties of soils (such as settlements, coefficients of consolidation in horizontal and vertical directions, and modulus of elasticity).For this new test device, conventional incremental consolidation frame or triaxial type chamber system either with the triaxial loading system or modified to adapt to incremental consolidation frame, shall be used to perform three-dimensional consolidation tests.

The invention provides an impact characteristic simulation test apparatus of an earthing device and a method thereof, and belongs to the simulation test field of the earthing device. The impact characteristic simulation test apparatus comprises an impact current generator, a semispherical test bath, a simulation earthing device, a core penetration type current sensor, an impact voltage divider, a wideband digital oscilloscope, a coaxial shielding cable and the like. According to the method, by employing the apparatus in the invention, an impact simulation test of the earthing device is carried out. According to the invention, a soil discharge process that a real lightning current goes through the earthing device and flows to surrounding soil is simulated accurately, and an impact earthing impedance of the earthing device and an impact flow rule of the earthing device are measured. The apparatus has the characteristics of high reliability, good security, low test cost and the like. The apparatus and the method can be widely applied to measurement of the impact impedance and the impact flow rule of the earthing device under an effect of a heavy impact current, and are especially suitable for measurement of the impact impedance and the impact flow rule of the earthing device under an effect of a lightning current.

The invention discloses a shear test device and a shear test method in an in-situ soil body pore. The test device is lowered to a test point by utilizing a drilling machine to bore, normal stress is provided by applying air pressure to facilitate the expansion of an airbag so as to drive a shear barrel to be expanded, a shear cutter on the periphery of the shear barrel can be inserted into a soil body so as to solidify the soil body, a steel rod is driven by applying hydraulic pressure through a gear to lift so as to drive the shear cutter to cut the soil body, the soil body is cut and destructed, and finally a shear index of the soil body can be calculated according to a coulombs law. The test method comprises the steps of boring, assembling the test device, lowering the device, solidifying, cutting and processing data. The invention also provides a shear test device in the in-situ soil body pore. According to the technical scheme, the strength index of the soil body can be determined under a natural stress state. The shear test device and the shear test method have advantages of low price, simplicity in operation, short test time and strong applicability.

The invention discloses a multi-factor comprehensive simulation accelerated testing device for a climatic environment. The multi-factor comprehensive simulation accelerated testing device comprises a testing box in which a sample frame is arranged, a light source system, an intelligent spraying system, a temperature and humidity regulating system, a circulation air system and a control system. With the adoption of the device, an environmental effect with five environmental factors, such as illumination, corrosive medium, temperature, humidity and air speed can be simultaneously simulated or strengthened; actions, such as radiation power variation, atomizing (or spraying), heating (or cooling), air speed and the like of the light source can be controlled by using an PLC (programmable logic controller) or a singe-chip so as to simulate and strengthen a plurality of typical climate environments; drying and watering circulation on the surface of a sample in the test box can be controlled well through adopting intelligent atomizing (or spraying) control; and accelerated ratio and relevance are improved. The testing device can be used for developing two kinds of different light aging test and damp heat test so as to achieve the effect that one box has multi purposes.

The invention discloses a testing device and a testing device method for simulating collapse of tunnel surrounding rock under conditions of rainfall and underground water seepage. The testing device comprises a model testing box, a rainfall adjustable simulating system, an underground water seepage simulating system, an underground water supplying system, a water content testing system, a stress monitoring system, a digital radiography noncontact measuring system and an optical fiber bragg grating displacement monitoring system. By simulating a progressive failure process of tunnel weak broken surrounding rock under the action of seepage of surface water and underground water, mechanical behaviors of crushing the surrounding rock under different rainfall conditions and different underground water seepage path conditions are quantitatively researched. By obtaining multiple-physical field information in a tunnel surrounding rock collapse process, multi-information features in different evolutionary phases and internal links of information of all fields of the collapse are analyzed, a progressive failure process and fracture morphology and ranges of the tunnel weak broken surrounding rock under different factors are determined, and the effective basis is provided for disclosing a progressive failure principle and a dynamic pressure arch effect of the weak broken surrounding rock under conditions of rainfall and underground water seepage.

The invention discloses a test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induction ignition. The whole test device comprises a test gas bottle, a nitrogen gas bottle, a high-pressure ventilating pipeline, a pressure stabilization valve, an electromagnetic valve, a pressure gauge, a vacuum pump, a high-pressure storage tank, a pressure transducer, an ICP (inductively coupled plasma) pressure sensor, a photoelectric diode, a rupture disk clamp (in which a rupture disk is arranged), downstream pipelines, a schlieren, a high-speed camera, a protection box, an air compressor and the like. The device can be used for (1) researching the influence of factors, such as different leakage pressures, shapes, lengths and diameters of different downstream pipelines, the gas initial temperature, a breakage shape of the rupture disk and obstacles outside an orifice, on the spontaneous combustion ignition, and further completing a spontaneous combustion ignition mechanism; (2) researching a shock wave induction ignition process and disclosing a shock wave induction ignition mechanism and influence factors thereof; (3) realizing the visible research on spontaneous combustion ignition and shock wave induction processes.

The invention relates to the research field of asphalt pavement materials and structures in highway engineering, and discloses a torsional shear test device for asphalt pavement materials and structures, which is characterized in that it includes a machine base, a reaction force frame arranged on the machine base, and a The worm gear mechanism at the bottom of the reaction force frame, the worm input end of the worm gear mechanism is connected to the pressure motor, the output end of the worm gear is connected to the lower support plate for clamping the test piece, and the pressure sensor is arranged on the lower support plate; the reaction force frame A torque motor is arranged on the top, and the output shaft of the torque motor is connected downwards to the disc torque sensor and the upper support plate for clamping the specimen in turn.

The invention discloses a multi-field coupling penetration test device and a multi-field coupling penetration test method for cracked rock. The device comprises a computer servo control system, a confining pressure chamber, a hydraulic system, a temperature control system and a chemical solution system, wherein the hydraulic system and the confining pressure chamber are connected by virtue of a confining pressure device, an axial pressure device and a seepage device respectively; the temperature control system is arranged outside the confining pressure chamber; and the chemical solution system is connected with the seepage device. The test method comprises the following steps: opening the hydraulic system, and loading an oil source; putting a sample into a pressure chamber; loading axial pressure and confining pressure; loading the seepage pressure; loading a chemical field; applying temperature; and measuring the data. The four-field loading systems are independent from one another, the evolution test research of permeability characteristics and mechanical properties of the cracked rock can be really simulated under high water pressure, large hydraulic gradient, temperature change and water chemistry complicated conditions, and the whole-process experimental research of rock deformation damage and penetration, stress, chemistry and temperature coupling can be performed.

The invention provides a multifunctional bearing test device, which comprises a rotation driving system unit, a loading system unit, a high and low temperature environment box, a lubrication cooling system unit and a measurement control system unit, and is characterized in that the loading system unit can control the loading force and the loading waveform of loading heads on an axial loading unit and a radial loading unit, and the high and low temperature environment box can realistically simulate a real temperature environment of a test. The multifunctional bearing test device can simulate service conditions of a test bearing in a test room, realizes performance testing for the test bearing under conditions of given rotating speed, lubrication, temperature, axial load, radial load and circumferential unbalanced impact load and the like, and analyzes influences imposed on the bearing performance by misalignment, poor lubrication, uneven stress and the like through data such as vibration acceleration, abrasive dust amount and the like acquired in the testing process, thereby being capable of more authentically simulating actual conditions of a rolling bearing when being subjected to the radial load, the axial load and the like, and being more reliable, systematic and scientific in service life and reliability evaluation for the test bearing.

The invention discloses a multifunctional true triaxial rock drilling test system and a test method for characterizing the characteristics of rocks. According to the method, a test piece is drilled for several times to obtain different rock cores, then the rock cores are subjected to single axial tests and triaxial tests so as to obtain a plurality of sets of mechanical property parameters; then a true triaxial rock drilling tester that can directly measure the parameters while drilling is used to obtain a plurality of sets of parameters while drilling; a mathematical relationship between the mechanical property parameters and the parameters while drilling can be established, and thus the mechanical property parameters can be obtained only through measuring the parameters while drilling of rocks according to the mathematical relationship. According to the method, a multifunctional true triaxial rock drilling tester is taken as the preset test apparatus; the tester can perform true triaxial loading on a test piece and is capable of simulating the drilling process when a test piece is pressed from three directions in underground engineering; the relationship between the parameters while drilling and mechanical characteristics of rocks under different pressures on a test piece can be established, and the test method comprises specific steps from sample preparation to data processing.

The invention provides a portable rock mass structural plane direct shear test apparatus for field and indoor use. The apparatus comprises a sample preparation shear box and a shear test device. Specifically, the sample preparation shear box is mainly composed of a shear box housing, mould stripping pieces fixed by knobs and the shear box housing, and clamping pieces positioned at the ends of fixation screw rods that are mounted on the mould stripping pieces; the shear test device mainly consists of a shear test device outer frame, a vertical bearing plate, a horizontal pressure bearing instrument, sensors and jacks, with the vertical bearing plate mounted at the upper part of the shear test device outer frame and between a sensor and a jack, and the horizontal pressure bearing instrumentdisposed on a rolling shaft unit in the shear test device. Used in field or indoor rock mass structural plane direct shear tests, the apparatus of the invention can save sample preparation time, thusbeing suitable for rapid structural plane direct shear tests. The apparatus provided in the invention can improve the accuracy and convenience of structural plane direct shear tests, and has the advantages of simple structure, easy manufacturing, convenient operation and low cost, etc.

The invention provides a synchronous detection test device for multi-item parameters of linear TBM hobs applied in the full-section hard-rock tunneling machine industry. The whole device consists of a self-counterforce frame, a regulate tool rest, an X-direction moving worktable, an X-direction linear guide rail, a Y-direction moving worktable, a Y-direction linear guide rail, an X-direction hydraulic cylinder, a rock sample, a hob, a four-rod guide mechanism, three-direction pressure sensors, a Z-direction hydraulic cylinder and the like, wherein the lateral movement direction of the rock sample is set as an X axis; the axial direction of the hob is set as a Y axis; the direction perpendicular to the surface of the rock sample is set as a Z axis; the rock sample is fixed on a trolley; the regulate tool rest is arranged on the four-rod guide mechanism; the X-direction moving worktable and the Y-direction moving worktable are arranged on a horizontal linear guide rail; the hob is arranged in a hob seat and is connected with the regulate tool rest through the three-direction pressure sensors; the rock sample is arranged and clamped on the X-direction moving worktable; and the three direction hydraulic cylinders are fixed with the fixed self-counterforce frame respectively. The device has the advantage of more precise function of simulating the process of breaking rocks through the hob, and is used for the synchronous detection of three-direction force, tool interval, penetration degree, wear degree, phase difference and other parameters of the hob in the states of linear paths and high-speed rotation of a plurality of hobs.

The invention discloses a temperature measurement method for electrified tensile test pieces and a tensile test device. An electronic universal testing machine with an insulating chuck is used for finishing an electrified unidirectional tensile test of metal test pieces and real-time measurement on the temperatures of the test pieces through thermocouple matching. The method comprises the steps: firstly spraying a protective agent to each of the test pieces to carry out anti-oxidization treatment; after the surface protective coating layers are naturally dried at a room temperature, performing insulating treatment on a thermocouple, clamping the two unidirectional tensile test pieces by the insulating chuck of the electronic universal testing machine, clamping the thermocouple between the two test pieces to ensure that the temperature measured by the thermocouple is the real temperatures of the center positions of the test pieces, electrifying a direct current power supply to heat the test pieces, and measuring the temperatures of the test pieces in real time by a thermocouple temperature measurer; after the test pieces reach the stable temperatures, switching on the electronic universal testing machine to carry out the unidirectional tensile test on the test pieces. Therefore, accurate temperature measurement on the unidirectional tensile test pieces can be guaranteed; furthermore, the test device is simple in structure, short in manufacturing period and low in cost.

The invention provides a concrete water cooling overall process testing device and method. A main testing machine comprises a concrete test sample containing device, and a test sample is placed in the concrete test sample containing device; a loading system is connected with a movable clamping chuck arranged on the concrete test sample containing device, a water cooling simulation system is arranged in a concrete test sample containing space and comprises a water pipe, the water pipe is provided with a water inlet and outlet connecting pipe which penetrates through the containing space to be connected with a water supplying device to form a loop, and the loop is provided with two executing mechanisms, that is, the cooling device and the circulating power device; a flowmeter and a water temperature sensor are arranged in the loop. According to the concrete water cooling overall process testing device and method, the self temperature stress developing process including the developing process of parameters such as adiabatic temperature rise, a thermal expansion coefficient, elasticity modulus and creep along with time of concrete in the overall process from pouring to hardening can be tested under the condition of multiple temperature control measures, and a true meteorological environment can be also simulated to simulate the temperature stress and the cracking mechanism which are influenced by natural factors. The device can set different temperature and constraint degree conditions including insulation, constant temperature, temperature rising and lowering process setting and the like as needed. The crack resistance of the concrete is evaluated through a concrete cracking overall process simulation test.

The invention discloses an indoor model testing device employing an air-pressure splitting vacuum preloading method. The indoor model testing device comprises a model groove, a pile-loading system, a vacuum loading system, an air-pressure splitting system and a measuring system, wherein the model groove comprises a plastic cylinder, a plastic cylinder base, a plastic cylinder top cover and reinforcing steel bars; the pile-loading system is a lever type loading device; the vacuum loading system comprises a drainage system, a sealing system and a vacuum-pumping system; the air-pressure splitting system comprises an air nozzle, an air conveying pipe, a pressure flow speed controller and an air compressor; and the measuring system comprises a displacement sensor, a pore water pressure meter and a data acquirer. The invention also discloses an application method of the indoor model testing device employing the air-pressure splitting vacuum preloading method. The indoor model testing device is reasonable and simple in structure and convenient to operate and can be used for performing model test of reinforcing soft soil by using the air-pressure splitting vacuum preloading method.

The invention discloses a five-axis linkage loading test device for a machine tool. The device consists of a following loading mechanism mechanical part and a measurement and control system. The following loading mechanism mechanical part applies a load to a spindle through an interface of the spindle of the machine tool. The measurement and control system is used for realizing servo motor control, mechanism motion control, load calculation and signal processing functions of the following loading mechanism mechanical part. The five-axis linkage loading test method for the machine tool comprises the five major steps of: 1, measuring load data; 2, establishing a load spectrum; 3, organizing tool path data; 4, performing hardware solidification of the data; and 5, calibrating and correcting a database. The device and the method are universal and widely applicable to various types of tests in the reliability of the machine tool, and have practical significance and reference value for the research and development of high-performance load simulators in China.

The invention provides a test device and method for simulating the influence of earthquake and rainfall effects on side slope stability. The device comprises an artificial rainfall device, a model box, a vibration table, a test monitoring system and a computer terminal. A flow meter is connected with a water supply main tube; the water supply main tube is connected with a water supply branch tube; the lower part of the water supply branch tube is connected with a rainfall sprayer; a water storage tank is connected with an electronic control valve through a water returning pipe; the model box is located below the rainfall sprayer; the model box is fixedly connected with the vibration table. The method comprises the steps that in the test, a high-definition digital image processing technique is used to track and observe the displacement change of side slope soil body; at the same time of camera shooting in the whole process, after the earthquake and rainfall effects, positions having abnormal situations of the side slope side and the side slope surface are observed and recorded; classification and integration and analysis are conducted on the collected data to obtain a side instability mechanism under the coupling effects of earthquake and rainfall. The test device and method have the advantages of carrying out related experiments of single earthquake, single rainfall, and the coupling effects of earthquake and rainfall; being simple in structure and low in test cost.

The invention provides a measurement testing device of external characteristics and internal flow of a fused salt model pump. The measurement testing device of external characteristics and internal flow of the fused salt model pump is mainly used for measuring the external characteristics and an internal velocity field of the fused salt model pump, and carrying out shooting and research of high-speed flow inside the fused salt model pump. The measurement testing device of external characteristics and internal flow of the fused salt model pump mainly comprises a pipeline system, a power transmission system, a model pump, an external characteristic data acquisition and analysis system and an internal flow measurement system. Arrangement of the pipeline system ensures an enough operating space, high measurement accuracy and convenience of testing when tests are carried out. The power transmission system provides power for stable operation of the fused salt model pump. An impeller and a pump supporting seat of the fused salt model pump are made of stainless steel, other components of the fused salt model pump are made of organic glass, and the fused salt model pump has the advantages of being good in hydraulic performance, high in strength, wide in measurable area and the like. The external characteristic data acquisition and analysis system collects signals of pressure, revolving speed, torque, flow and the like, the signals are processed and analyzed, and the external characteristics of the fused salt model pump are obtained. The internal flow measurement system can carry out peak inverse voltage (PIV) measurement to the internal velocity field of the fused salt model pump, carries out internal peeping high-speed imaging to internal flow of the fused salt model pump, and achieves research of an internal whole flow field of fused salt model pump.

The invention discloses a rock fracturing simulation test specimen with crack, a preparation method for the rock fracturing simulation test specimen, a simulation test apparatus and a simulation test method, and belongs to the technical field of rock simulation tests. The rock fracturing simulation test specimen comprises a rock test specimen body, a fracturing fluid injection tube and a pouring material. The pouring material covers the rock test specimen body so that the formed rock fracturing simulation test specimen with the crack is integrally in the shape of a cuboid, a blind hole starts to be formed in an end point of the cuboid and is terminated at the rock test specimen body, the fracturing fluid injection tube is fixedly connected onto the wall of the blind hole, an accommodating space is reserved between the bottommost end of the fracturing fluid injection tube and the bottommost end of the blind hole, and a plurality of spray holes start to be formed in the wall of the blind hole and extend towards the rock test specimen body. The rock fracturing simulation test specimen is applied to the simulation test apparatus, and the simulation test method is based on the simulation test apparatus. The rock fracturing simulation test specimen, the preparation method, the simulation test apparatus and the simulation test method have the advantages that crack fracturing physical simulation can be carried out on rock masses of shale gas reservoirs by the aid of the rock fracturing simulation test specimen, the simulation test apparatus and the simulation test method, and the rock fracturing simulation test specimen, the simulation test apparatus and the simulation test method also can be used for rock masses of other tight reservoirs and accordingly are high in applicability.

The invention relates to an indoor model testing apparatus for analyzing influences of shield tunnel grouting construction on adjacent pile foundations. The indoor model testing apparatus comprises a model box, a tunnel grouting construction simulator, a tunnel lining model and a pile foundation model. The model box is filled with sandy soil mass, the tunnel lining model comprises longitudinally-segmented aluminum alloy hollow pipes and is placed in the left half part of the model box, and lining segments are separated by annular thin rubber plates; the pile foundation model is placed in the right half part of the model box and vertical to the tunnel lining model; a displacement meter support is fixed to the top surface of the model box; multiple displacement meters are respectively fixed to the corresponding sandy soil mass and the surfaces of piled raft foundations of the pile foundation model through the displacement meter support; the tunnel grouting construction simulator comprises a latex film surrounding the periphery of the tunnel lining model and an annular liquid cavity formed between the tunnel model and the latex film, the annular liquid cavity is filled with grouting liquid, one end of the annular liquid cavity is connected with a liquid injection guide pipe provided with a liquid injection solenoid valve, and a liquid discharge guide pipe provided with a liquid discharge solenoid valve is arranged at the other end of the annular liquid cavity in the horizontal direction.

The invention discloses a point contact type fretting fatigue test device and a point contact type fretting fatigue test method. The test device comprises a fretting bridge in direct contact with a sample, a loading ring with a ring surface perpendicular to the axial direction of the sample, and a loading bolt which passes through the wall of the loading ring to be in contact with the fretting bridge; the sample passes through the center of the ring surface of the loading ring; the contact surface of the fretting bridge and the sample is provided with a fretting bridge leg in the shape of a convex arc surface; the fretting bridge leg or the loading bolt is provided with a strain foil and is connected with a strain gauge; the point contact between the fretting bridge and the sample is achieved by the direct contact between the fretting bridge leg of the fretting bridge and the sample; the contact surface of the sample can generate slight relative movement and normal pressure is applied to the contact surface of the sample, by means of adjusting the loading bolt to apply pressure to the fretting bridge. Matched with a fatigue testing machine, the test device can be used for performing theoretical research on stretching tension, torsion and tension-torsion composite fretting fatigue modes.

The invention relates to a test table for testing the security of a hydrogen supply system of a fuel cell bus and the test method thereof, and belongs to the security technology field of the fuel cell bus. The test table comprises a hydrogen supply system simulation device, a main control computer, an electrical control cabinet, a high pressure hydrogen bottle and a hydrogen detector, wherein the hydrogen supply system simulation device is connected with the output mouth of the high pressure hydrogen bottle, and bilaterally connected with the main control computer; the main control computer is connected with the electrical control cabinet, the high pressure hydrogen bottle and the hydrogen detector; the electrical control cabinet is respectively connected with the high pressure hydrogen bottle and the hydrogen supply system simulation device; the test table further comprises a bench for fixing and supporting the hydrogen supply system simulation device. The method comprises the following steps: a valve to be tested is connected with an identical valve in a pipeline of the hydrogen supply system simulation device in parallel; the working state of the valve to be tested is simulated; according to data such as gas pressure, flow, hydrogen concentration, etc. in an acquisition pipeline, whether the performance of the valve to be tested is qualified can be judged. The test table is used for dynamically testing the security of the key components of hydrogen supply system of the fuel cell bus.

A pressure vessel fatigue test system belongs to pressure vessel test technical field, comprising oil circuit pressure device, pressurizer, weight relieving motion, and measuring and control system. The oil circuit pressure device, pressurizer, weight relieving motion consists of pump linked by pipeline and oil pump driven by electric machinery, solenoid valve, overflow valve, water cooled oil cooler, back oil filtration device, oil tank and pipelines linked with them, the measuring and control system is consisted of electric contact pressure gauge, temperature sensor, pressure sensor, computer, controller for measurement and control temperature of pressure vessel, hydraulic oil, one-way throttle valve and high pressure filtration device are fitted with pipeline linked with solenoid valve and the container, stabilization tank is fitted with oil return pipe linked to solenoid valve and oil tank. The invention is suitable for fatigue test of pressure vessel containing impurity within and fairly high pressure needed and reconstruction to present pressure vessel fatigue test device.

The invention belongs to the technical field of heat transfer and discloses a method and a device for predicting the node temperature of a shell and tube heat exchanger. The invention relates to a single-tube heat exchange tube testing device; based on the device, the heat transfer characteristics of a single heat exchange tube can be acquired; and the node temperature of tube pass and shell passfluid of the shell and tube heat exchanger can be determined by matching the method for predicting the node temperature of the shell and tube heat exchanger. The method mainly comprises the followingsteps of: determining the length of a tested heat exchange tube section according to a space between baffles in the heat exchanger, determining a cylinder section number needed by constructing a shell pass cylinder, processing a heat exchange tube sealing plate, welding a tube flange, and assembling a testing device; determining testing parameters according to tube pass and shell pass inlet / outlet temperatures of the heat exchanger, testing the heat transfer performance of the heat exchange tube section, and establishing a mapping relationship between single tube inlet / outlet temperatures andupstream and downstream fluid temperatures outside the tube; and starting a computer program, inputting design data of the heat exchanger, executing an analysis command, and outputting a temperature value of each node inside the heat exchanger after the analysis is ended.

The present invention discloses a true triaxial test ultrasonic wave and acoustic emission testing system. According to the present invention, a true triaxial test apparatus has six sides of pressurization units, wherein ultrasonic wave and acoustic emission coupling test transducers are arranged between every side of the pressurization unit and corresponding surfaces of rock, a communication terminal of at least one ultrasonic wave and acoustic emission coupling test transducer is connected with a signal output terminal of a multi-channel ultrasonic wave defect detector, communication terminals of other ultrasonic wave and acoustic emission coupling test transducers are respectively connected with a signal input terminal of the multi-channel ultrasonic wave defect detector and a signal receiving terminal of an acoustic emission instrument through signal shunts, and the acoustic emission instrument and the multi-channel ultrasonic wave defect detector are connected with a computer. With the present invention, an ultrasonic wave test and an acoustic emission test can be performed on the same rock, completely comprehensive data information can be provided for understanding of deformation and breaking law, and mechanics mechanism of the rock, and adverse affects on test results by difference of different blocks can be avoided.

The invention discloses an improved pile foundation vertical bearing capacity test reverse self-balanced method and a testing device. The testing device comprises a poured upper pile section, a poured lower pile section, a load box arranged in a middle pile section, a test control unit and a displacement measuring instrument. An anchor cable free section penetrates through an insulation pipe in the upper pile section and extends out of the top of the upper pile section by a certain free length. Loading oil cylinders are arranged between the anchor cable free section and the top of the upper file section. An anchor cable fixed section is fixedly connected with the lower pile section. A displacement rod connected with the displacement measuring instrument is arranged on the upper pile section and the lower pile section. The load box is loaded to make the upper pile section and the lower pile section displace oppositely at first; the loading oil cylinders at the top of the upper pile section are loaded to make the upper pile section and the lower pile section displace relatively; and finally, the load box is recovered, the middle pile section is poured, and the bearing capacity conditions and displacement deformation of a pile foundation under two conditions are recorded correspondingly. According to the self-balanced method and the testing device, negative friction of the upper pile section and the defect that the load box cannot be recovered through traditional self-balanced methods are overcome, the operation is simple, and the cost is low.

The invention discloses a torsion fatigue test method for a spring steel wire and a device thereof. By setting of a steel wire test piece, a spring tension-compression fatigue test is equivalent to a torsion fatigue test of the spring steel wire with same parameters. According to the test method, the steel wire test piece is same in size with the steel wire for preparation of a spring product, compared with a material-based rotating bending fatigue test method, the torsion fatigue test method can meet requirements of dimensional factors in the fatigue test, correction factors can be reduced, more reliable results can be obtained, compared with a product-based tension-compression fatigue test method, the torsion fatigue test method has significant advantages in high-stress and large-amplitude test requirements. The test device can meet high frequency long period requirements in the process of the torsion fatigue test method by setting of a spring clamper for clamping and a part rolling bearing and a round head flat key, the test device is safe and reliable in the operation process of the test, a direct-drive servo drive system is used as a transmission mode, and safety and stability of long-period work of the test device can be enhanced.

The invention discloses a method for testing and analyzing frictional noise and a test device for the method. The method comprises that: a lower fixture clamping a lower friction part is fixed onto a reciprocating device; an upper fixture clamping an upper friction part penetrates through a horizontal support to contact with the bottom of a strain force sensor; a three-dimensional acceleration sensor is mounted on the upper fixture; two ends of the horizontal support are fixed onto support bases by piezoelectric force sensors; and the strain force sensor is fixed to the bottom of a two-dimensional moving table. A sensing end of an acoustic sensor is close to a contact interface of the upper friction part and the lower friction part, and the two-dimensional moving table is controlled so that the upper friction part and the lower friction part are controlled to do reciprocating friction motion, and the three sensors accurately, synchronously and dynamically acquire the frictional noise,vibration acceleration and frictional force and analyze the frictional noise, the vibration acceleration and the frictional force in real time. Therefore, mutual relation and influencing law of the frictional noise, the interface and characteristics of a system are accurately analyzed, a mechanism of production of the frictional noise is disclosed, and a more accurate and reliable test basis is provided for realizing noise-reduction design for mechanical equipment, improving performance of the mechanical equipment and prolonging the service life of the mechanical equipment.

The invention discloses a simulated testing device for the hydraulic fracture of a concrete member under different stress conditions, relating to the technical field of testing devices for the hydraulic fractures of concrete members. The simulated testing device comprises a cuboid die with an opening on one surface, wherein the die is filled with concrete to obtain the concrete member, the concrete member is internally provided with eight high-pressure-resistant water elbows in advance, and the tail end of each high-pressure-resistant water elbow is provided with a water pressure sensor connector; a steel sheet is pulled out of the concrete member to prefabricate an initial crack, a groove defined within a certain range is polished at the periphery of the crack, a strain gauge and a clip extensometer are arranged, and the groove is filled with waterproof insulating cement and ground to be flush; and the member is provided with a water seal steel sheet on which a water inlet and an exhaust port with a sealing cap are arranged. Based on the simulated testing device, the testing research for the hydraulic fracture of the concrete member can be realized under a different stress condition and different initial crack inclination angle condition combined condition.

The invention provides a pull-out test device for simulating anchor rods in deep strata and a test method of the pull-out test device. The pull-out test device comprises a pressure supply mechanism, aseepage supply mechanism and a pull-out mechanism. A rubber water bag is used for packaging and squeezing concrete to simulate surrounding rock pressure in a roadway at a certain temperature, seepagewater in a seepage pressure storage tank is used for simulating seepage pressure in the roadway, a jack of a hollow plunger is used for pulling the anchor rods to simulate pulling force borne by theanchor rods in an anchor rod supporting mode, in the process, the pulling distance is measured by an axial displacement measuring device, the pulling force exerted by the jack of the hollow plunger isrecorded by a pressure sensor, the pulling distance is measured by the axial displacement measuring device, and the stress-strain of the anchor rods in the pulling process is recorded by a fiber bragg grating strain sensor. The pull-out test device for simulating the anchor rods in the deep strata and the test method of the pull-out test device can provide corresponding and accurate theoretical basis for the supporting design of deep underground tunnels.