532 results about "Static loading" patented technology

A glass laminate substrate for electronic substrates, such as flat panel displays, includes a transparent glass core bounded by transparent glass skin layers, wherein the coefficient of thermal expansion of the core is greater than the coefficient of thermal expansion of the skin layers thereby forming a residual compressive stress in the skin layers and a residual tensile stress in the core. The relative thickness of the skin layers can be selected to enhance the strength of the glass laminate substrate while maintaining a sufficiently low residual tensile stress in the core to allow scribing and separating of the substrate to size. Interlayers can be located between the core and the skin layers, wherein the interlayers include a residual compressive stress, and produce a reduced residual tensile stress in the core.

The invention relates to a multi-field coupled coal rock impact loading experimental device and method. The experimental device comprises an axial static pressure loading device, an axial static pressure loading hydraulic oil pump, an axial static pressure oil delivery pipe, an ambient pressure loading hydraulic oil pump, an ambient pressure loading oil delivery pipe, a radial ambient pressure loading device, a gas tank, a gas inlet pipe, a gas pressure regulating valve, an air extracting pump, a gas sensor, a gas outlet pipe, a cold and hot dual-purpose compressor, a servo oil pump and a cold and hot dual-purpose oil delivery pipe. By using the experimental device and method, a coal rock sample can be in a multi-field coupling state and the condition that the coal rock sample is in axial static loading, radial ambient pressure static loading, gas pressure and temperature coupling states, so that an experiment can be carried out aiming to the dynamic loading conditions.

The invention discloses a comprehensive performance test bench for a planetary roller screw. A driving assembly provides power for the planetary roller screw; a test assembly is used for mounting a planetary roller screw of a different model; a hydraulic loading assembly is adopted to carry out dynamic and static loading on a planetary roller screw nut, load borne by the planetary roller screw during actual work is simulated, and a force closed loop is adopted to ensure accuracy of the loading force. The test bench is provided with a torque sensor, an angle encoder, a circular magnetic grating, a grating ruler, a LVDT, and a force sensor. Measurement on torque, an angle, displacement and force is realized through the sensor. Through analyzing the test data, test on performance of the position precision, the speed, the acceleration, the transmission efficiency, the transmission clearance and the axial stiffness of the planetary roller screw of the different model in the load state can be completed. The test bench has the advantages of simple and flexible structure, thorough and accurate test performance parameters, high loading precision and strong test scalability.

The invention discloses a large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests. The machine comprises a measuring and controlling unit (1), a hydraulic servo unit (2), a loading unit (3) and a soil sample preparing unit (4). The loading unit (3) comprises a Z-direction vertical loading frame, an X-direction horizontal loading frame and a Y-direction horizontal loading frame, the three frames are perpendicular to each other, and the three frames all have independent loading ability. The hydraulic servo unit (2) comprises an X-direction horizontal loading actuator (311), a Y-direction horizontal loading actuator (312) and a Z-direction vertical loading actuator (31). The measuring and controlling unit (1) is in separate communication connections with three electro-hydraulic servo loading cylinders of the hydraulic servo unit (2). The large bidirectional dynamic/static direct-shearing machine is used in coarse-grained soil shearing performance tests, coarse-grained soil shearing performance tests on reinforced contact interface and coarse-grained soil shearing performance tests on concrete interface under the dynamic/static loading effects of simulation traffic loading.

The invention discloses a method and a device for testing dynamic stiffness of a vibration isolator. The method comprises the steps of establishing an equivalent test model of a single-degree-of-freedom vibration system in a vibration isolation direction by using a static loading device, a combined vibration mass block and an elastic simply supported beam, measuring a frequency response function of the equivalent test model by an exciting method, and then indirectly obtaining the dynamic stiffness of the vibration isolator by virtue of a vibration equation, the similarity of the vibration system and the characteristics of the single-degree-of-freedom system. The method avoids the problem that the existing methods all need to simulate a rated load or a working load with an equivalent mass block in an ingenious way, and solves the problem that the test system is clumsy, high in test cost and test difficulty and even unachievable if the mass block is used for simulating high rated load or working load; the testing device is light and simple in structure, convenient to operate, and economical and practical; the method and the device are applicable to the dynamic stiffness tests of all single-axis vibration isolators, high in applicability, and especially capable of realizing testing of the dynamic stiffness of a large-rated load vibration isolator and ensuring high precision.

The invention discloses a test method for the fatigue damage and the service life of a horizontal axis wind turbine blade, aiming to obtain a more exact blade fatigue performance parameter by adopting a test detection and computational analysis means having low cost and high efficiency so as to meet the requirements of blade design, research and development and detection. The method is characterized in that on the basis of the characteristic that the impeller speed of a horizontal axis wind turbine is lower, and the period change frequency of various fatigue loads is also lower, a series of steps of carrying out static loading testing on the wind turbine blade to obtain a stress/strain amplitude distribution condition under the effect of various fatigue loads and analyzing by combining a material property curve and a cumulative damage theory are adopted to realize the evaluation to the blade fatigue performance. Compared with the traditional horizontal axis wind turbine blade fatigue testing technology, the method has the advantages of short period, low cost, capability of obtaining a final service life parameter of the blade, and the like.

The invention relates to an engine vibration isolation device of a magneto-rheological fluid damper in extrusion mode and a magneto-rheological elastomer in shearing mode for supporting static loads. The vibration isolation device comprises two pars of a damping adjusting unit and a rigidity adjusting unit; the damping adjusting unit is connected with the rigidity adjusting unit through a rigid connecting rod; the vibration of an engine causes the connecting rod to move upwards and downwards, so that the magneto-rheological fluid in the damping adjusting unit flows in radial direction and shearing occurs to the magneto-rheological elastomer in the rigid adjusting unit; a magnetic field generated by two exciting coils can be respectively adjust damping parameters and rigidity parameters of a vibration isolator. The magneto-rheological vibration isolator can meet the independent adjustment of the damping parameters and the elastic parameters of the vibration isolator under different vibrational excitation conditions, and achieve the coupling control of the transmission of engine vibration energy, and has great realistic significance in improving the technical level and market competence of special vehicles.

The invention discloses a test procedure of 32m/900t pre stress pre open box girder concrete box, it includes building testing counter, laying test beam body, fixing balance weight and setting test equipment, and doing load test of three circulation by ordering step by step, and dong crack test for the 32m/900t pre open box girder effectively, splitting test and breaking test, dong experiment for the design of 32m pre open box girder, construct artwork, workmanship and the anti split and intensive properties of box girder.

This invention relates to laser and material performance test using continuous loading long-pulse laser to load a coating or film test subject surface in quasi-stationary state and heat its thin layer (only dozens of nm thick) with laser thermal action and thermal conduction thereafter, to form a temperature field in the subject. When the thermal stress reaches to a certain value on the coating abbesion will heppen to the subject or even warping or scaling due to the difference between coefficient of thermal expansion and the temperature and the feed system makes the subject to do feed movement to form mars on the surfaces. The related laser energy at scaling position at the interface can express the binding strength of the interface to get the binding strength by theory analysis and digital calculation.

An active bearing at least for vibration reduction is described, comprising

a) an interface (7) to be fitted to a load (8);

b) at least one support element (3) in an operative connection with the interface (7) and a support unit (6);

c) at least one linear actuator (5) supported indirectly or directly on the support unit (6);

d) a gear unit (4) for the path transmission of an actuating path change originating from the linear actuator (5), said gear unit being in an operative connection with the at least one linear reactor (5);

e) at least one decoupling unit (1), which serves for the decoupling of the static load transfer and for transmitting the dynamic load transfer; wherein the at least one linear actuator (5), the gear unit (4) and the at least one decoupling unit (1) are disposed serially.

A high-pressure true triaxial test apparatus with capacity of low-frequency disturbance and high-speed impact includes static and dynamic loading frames, four static loading actuators, two dynamic loading actuators and an SHPB mechanism, wherein all actuators are connected with a hydraulic station system; a hollow way is formed in the axial center of each piston shaft of the dynamic loading actuators, a dynamic pressure sensor adopting a hollow ring structure is mounted at the end part of each piston shaft, and the SHPB mechanism applies a high-speed impact load on a rock sample through the dynamic pressure sensors respectively; and the dynamic loading actuators adopt a static pressure oilway balance support sealing manner and are connected with the hydraulic station system, each oilway is provided with an energy accumulator, and flow is increased by the servo valves to drive pistons to perform dynamic response.

The invention relates to a test device applied to the field of ball screw pair reliability, in particular to a ball screw pair reliability test stand provided with electro-hydraulic servo loading devices, which mainly consists of a ball screw pair driving part, a load application part and an automatic control part, wherein the ball screw pair driving part consists of a servo motor (14), a ball screw pair and a working platform (7); the load application part comprises the two sets of electro-hydraulic servo loading devices which are respectively arranged on the left end surface and the right end surface of the working platform (7); and the automatic control part comprises an upper industrial personal computer, a lower programmable logic controller (PLC), a servo driver, an analog/ digital (A/ D) card, an electromagnetic directional valve, a signal amplifier, a pull pressure sensor and a displacement sensor. The ball screw pair reliability test stand can be used for realizing dynamic or static loading for different types ball screw pairs, and carrying out reliability test on the ball screw pairs.

A true triaxial experiment system for rock materials comprises a loading frame and a triaxial clamp box, wherein an X-direction cart type loading device, a Y-direction separation type loading device and a Z-direction single-head type loading device, each loading device is equipped with a static loading cylinder and a disturbance loading cylinder, and bearing tables and static loading cylinders are arranged at an interval front and back, left and right and up and down respectively; the triaxial clamp box comprises a box body and a lower Z-direction loading rod, an upper Z-direction loading rod, two X-direction loading rods and two Y-direction loading rods, which are used for being contacted with six end surfaces of a cubic rock sample for loading respectively, and a sound emission sensor and a deformation sensor are mounted on each of the lower Z-direction loading rod, the upper Z-direction loading rod, the two X-direction loading rods and the two Y-direction loading rods. The true triaxial experiment system for the rock materials can realize independent static and different-source disturbance loading and unloading and has the advantages that a sample is convenient to mount, loading and bearing parameters are synchronized precisely, characterization parameters in a sample mutagenesis process are diversified and the like.

The invention provides a multi-degree-of-freedom loading method based on parallel mechanism driving force closed loop. The multi-degree-of-freedom loading method comprises the following steps: converting force and moment, which are required to be applied to a tested element, into driving force for loading each actuator of a six-degree-of-freedom parallel mechanism; and then carrying out force closed loop control on each actuator of the parallel mechanism so as to achieve the control on the multi-degree-of-freedom load of the tested element. The loading method also can comprise the steps of carrying out force positive solution operation on the driving force of the parallel mechanism, and resolving the force and moment which are applied to the tested element, thereby achieving accurate multi-degree-of-freedom force loading on the complex stressed tested element by the six-degree-of-freedom parallel mechanism. Thus, under the condition of not using a six-degree-of-freedom sensor, the force and moment on the tested element can be measured; the complicated multi-degree-of-freedom stress and moment of the tested element can be loaded in a static mode or in a dynamic mode; moreover, the loading force and moment, which are applied to the tested element, can be calculated accurately.

The invention relates to an analog loading system for a servo system. An output shaft of the servo system is mechanically connected with a retarder, an inertia plate and a loading motor in turn via a connecting shaft; wherein the loading motor is connected with a motor driver which is connected with an inverter electric signal, a moment controller is connected with the motor driver and a rotation moment and rotation speed sensor and connected with a command computer, and the rotation moment and rotation speed sensor is arranged on the connecting shaft between the servo system and the loading motor. The invention can simulate any-sized inertial loading and dynamic/static loading with any characteristics. The invention adopts an electrically loading manner under moment, so as to overcome the shortcomings such as difficult turnaround of direct current generator loading and low reliability of magnetic powder clutch loading, and the servo device loading presents no redundant moment. The invention can simulate loading with the advantages of wide moment range, high precision, high repeat frequency and high response speed.

The invention discloses an anchor stock mechanical response test device under dynamic and static combined load and a using method thereof. The device comprises a vertical frame, a static loading mechanism and a dynamic loading mechanism. The vertical frame is provided therein with an anchor stock to be tested. The upper end of the anchor stock to be tested is fixedly connected with the top of thevertical frame. The lower end of the anchor stock to be tested extends vertically downwards. The static loading mechanism is disposed at the lower part of the vertical frame, is connected with the lower end of the anchor stock to be tested, and is configured to apply static load to the anchor stock to be tested. The dynamic loading mechanism is arranged below the static loading mechanism and configured to apply dynamic load to the anchor stock to be tested. The anchor stock mechanical response test device realizes a mechanical response test of the anchor stock to be tested under the combined dynamic and static load. The static load and the dynamic load can be controlled manually and can be adjusted in real time. In addition, the anchor stock mechanical response test device is simple, stable and reliable in test operation, and has great significance on the support design of deep mines and tunnels.

The invention discloses a loading device and a loading method for a three-dimensional compound type crack growth test. The loading device comprises an inner clamp, an outer clamp, a tested piece and a test system, wherein the inner clamp is composed of a circular lining and a pin shaft; the outer clamp is composed of a C-shaped arc arm plate, a circular plate, a bolt, a pin and a tester chuck; the test system comprises high-power microscopes, a microscope reading rod, a tester, a control switch and a test treating system. The static loading or fatigue loading tests for single I, II and III type cracks and a multi-type combined three-dimensional compound type crack can be realized in the manner of adjusting an assembling angle of the clamp on the tester. The high-power microscopes arranged on the two sides of the crack surface of the tested piece can be used for observing the extension form including length and angle of the three-dimensional crack in real time. The loading device has the advantages of flexible adjustment for crack type and real-time observation for crack extension form.

The invention discloses a sub-ultrasonic high-frequency fatigue testing machine. An energy converter used as a driving force source, the energy converter, a tested sample and a driven amplitude transformer form a resonance system, and a prearranged static loading mechanism provides static load for a test piece. The energy converter can be a full-wavelength energy converter or a half-wavelength energy converter. The energy converter converts an electric signal into mechanical vibration under the driving of an external alternating voltage, so the whole system is in a resonance state, and the tested sample has resonance vibration and a stress, thereby the fatigue detection can be realized. The energy converter can be a piezoelectric energy converter or a giant magnetostrictive energy converter. The sub-ultrasonic high-frequency fatigue testing machine allows the sub-ultrasonic high-frequency fatigue tests of the test piece under different stress ratios to be carried out according to the system prearrangement state; compared with traditional high-frequency fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantages of simple structure, small volume, test period shortening, high efficiency and energy saving; and compared with present ultrasonic fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantage of reduction of the frequency effect and the dimension effect to the material fatigue performances.

The invention relates to an in-situ indentation mechanical testing device based on tensile compression and fatigue combined load mode, and belongs to the field of precise testing instruments. The device is mainly composed of a precise driving unit, a tensile compression and fatigue combined load unit, an indentation load unit, a precise sensing and detecting unit, wherein the precise driving unit can realize quasi-static load; the tensile compression and fatigue combined load unit enables the center of a testing piece to be kept unchanged basically; with combination of a high-resolution imaging system, observation of in-situ mechanical performances of a material can be carried out. A fatigue module is loaded on a tensile compression module, so that fatigue performance of the material can be tested by adopting the precise piezoelectric driving technology. The indentation load unit is arranged right above the testing piece and is pressed in the testing piece vertically, a lead screw stepping motor drives an indentation flexible hinge to feed linearly, and an indentation piezoelectric stack pressed in the testing piece drives precise indentation, so that cross-scale in-situ indentation mechanical test can be carried out. The device has the advantages of compact structure, small size, rapid response, high precision, low cost and the like.

The invention provides a loading device and a loading method of geotechnical engineering model test. The loading device comprises a static loading mechanism, the static loading mechanism comprises a ground anchor, two reaction frame stand columns, two force sensors, a reaction frame crossbeam, two loading bolts, a reaction plate, at least two loading springs and a pressure bearing plate; the two reaction frame stand columns are fixed on the ground anchor through adopting stand column anchor bolts; the two force sensors are respectively connected to the middle segments of the reaction frame stand columns; the reaction frame crossbeam crosses over the two reaction frame stand columns and is blocked from top to bottom by adopting loading bolts; and the reaction plate is arranged below the reaction frame crossbeam and is fixedly connected with the pressure bearing plate through the loading springs, the device can also comprise a dynamic loading mechanism, and the dynamic loading mechanism comprises a header plate, header plate fixing bolt rods and an actuator. The device and the method can realize the static creep deformation test of a geotechnical engineering model, or the coupling loading of the static creep deformation test and dynamic fatigue test.

The invention discloses a tension and compression testing machine hydraulic loading system adopting differential control of proportional overflow valves. The system comprises a hydraulic pump station, a low-pressure filter, an oil return one-way valve, the high-pressure proportional overflow valve, a flow dividing valve, the two low-pressure proportional overflow valves, an oil inlet one-way valve, two electromagnetic reversing valves, two tension and compression force sensors, two hydraulic cylinders, two displacement sensors and a force and displacement compound controller. The differential control of the proportional overflow valves and compound control over the pressure and displacement of the hydraulic cylinders by pressure valves are adopted, and the micro force control and loading force control precision of a testing machine is improved; and during static and quasi-static loading of the tension and compression force testing machine, the loading force and the hydraulic cylinder synchronous displacement in the loading process are controlled in real time, and control over any loading curve and synchronous control over the multiple hydraulic cylinders are achieved. By means of the tension and compression testing machine hydraulic loading system adopting differential control of the proportional overflow valves, the tension and compression testing machine can adapt to various complicated loading work conditions. The tension and compression testing machine hydraulic loading system adopting differential control of the proportional overflow valves is suitable for the occasion where the loading force changing range is wide, the adjusting precision is high, and the hydraulic cylinders frequently need to perform synchronous control during static and quasi-static loading.

The invention discloses an underground structure quasi-static test device and method. The device includes a counterforce device, a model box, a boundary constraint device, an actuator and an underground structure model. The counterforce device is composed of a counterforce wall and a steel frame. The model box is located between the counterforce wall and the steel frame and is spliced by four vertical reinforced steel plates and a bottom steel plate. The model box adopts flexible connection for the gaps among the reinforced steel plates on the periphery. The tops of the left and right reinforced steel plates are pulled towards each other by roller connecting members, and the bottoms are hinged with the bottom steel plate with rollers. The left side of the model box is provided with the actuator at the top and is provided with a hydraulic pressure stabilizer at the bottom. The model box is provided internally with an underground structure member and is filled with a similar material to surrounding rocks. The mode box is provided with rubber spacers on the two sides. The rubber spacers are connected with the steel plates through clamping grooves. The rubber spacers can be varied in the type and detached partially to simulate different constraint conditions. The underground structure quasi-static test device and method of the invention can achieve quasi-static loading of an underground structure and simulate seismic response features of the underground structure, and have the advantages of being economical in test, simple to operate, high in reliability and so forth.

The invention discloses a single-leg impact control experiment platform for a robot. The single-leg impact control experiment platform comprises an integrated controller, a robot leg lifting device, a test bed bracket, a static loading device, a six-dimensional force sensor and a five-dimensional force measurement platform, wherein the test bed bracket comprises a test bed bracket base and a test bed bracket vertical column; the integrated controller is fixed on the test bed bracket base; the robot leg lifting device is fixed on the test bed bracket; the static loading device is fixed on the robot leg lifting device; the six-dimensional force sensor is arranged between the lifting device and a robot body; and the five-dimensional force measurement platform is fixed on the ground below the six-dimensional force sensor. The single-leg impact control experiment platform can obtain indexes such as a dynamic response characteristic of single-leg popping motion under different constant loads and the structural stability of a single leg under the action of large short-time impact. The platform is simple in structure and runs stably and reliably.

The invention discloses a complex load tester, and belongs to the technical field of pipeline testing. A host machine of the tester comprises an axial force loading device, a bending moment loading device, an internal pressure loading device, a hydraulic system and a measurement control system. The complex load tester can individually apply an axial load, bending moment, internal pressure and the like to a steel tube test sample, also can apply two or more combined loads simultaneously, can simulate the real stress environment of an oil gas conveying steel tube, can apply a load statically, and also can supply a load in a low-frequency reciprocating mode. An electro-hydraulic servo enclosed loop measurement control system is adopted for the tester so as to control constant speed test force and constant speed displacement; the control modes can be switched stably in the testing process; data of load, internal pressure, displacement, deformation and the like can be collected automatically in the testing process, and the recording and the like of the test data can be completed automatically. The tester corresponds to the relevant national standards and industry standards in structure, function, performance and the like, and has the advantages of good integral performance, high control accuracy, good simulation effect, good reliability, simple operation and the like.