264 results about "Test measurement" patented technology

The invention relates to a power supply switching control optimization method and system, and the method comprises the steps: constructing a multi-dimensional data fusion monitoring system, integrating a real-time voltage ripple coefficient detection module of a main power supply, a load transient response analysis module and an environment temperature and humidity sensor array, and generating a dynamic health degree index; the method comprises the following steps: establishing a fault prediction model based on transfer learning, pre-training through multi-scene failure data in a historical database, receiving a health degree index in real time, outputting a reliability attenuation curve, and activating a dual verification mechanism when the slope of the attenuation curve exceeds a preset threshold; extracting characteristic energy distribution of a frequency band of 0.1-10 kHz; executing a transient load impact test, and measuring dynamic response parameters of voltage recovery time and overshoot amplitude; and generating a switching confidence score based on cross processing of the dual verification result and the attenuation curve, and triggering a hierarchical switching instruction. The accuracy of the switching time of the main power supply and the standby power supply can be improved.

The invention belongs to the field of turbine tests, and discloses a flow field reconstruction method based on test measuring point position optimization and multi-source data fusion and a related device, and the method comprises the steps: building a CFD data set and a sparse measuring point test data set; carrying out POD decomposition on the CFD data set; according to the sparse measurement point test data set, a correction modal coefficient is obtained by using a Gappy POD algorithm; according to the POD mode and the correction mode coefficient, obtaining a Gappy POD reconstruction flow field parameter; taking the minimum error of the global low-fidelity flow field parameter and the Gappy POD reconstruction flow field parameter as a target to obtain an optimal measurement point position; based on the optimal measurement point position, high-fidelity discrete test data is obtained, and an optimized modal coefficient is obtained by using a Gappy POD algorithm; obtaining a flow field reconstruction result of the turbine blade according to the POD mode and the optimization mode coefficient; according to the method, fine reconstruction of the global flow field distribution of the turbine blade is realized.

A measurement system includes a signal analysis circuit, a signal generator circuit, a control circuit, and a DUT connector. The DUT connector is connectable to a device under test for receiving a measurement signal outputted by the DUT. The signal analysis circuit is connected to the DUT connector for receiving the measurement signal. The signal generator circuit is configured to generate a radio frequency (RF) test signal that is transmitted to the DUT. The signal analysis circuit is configured to digitize the measurement signal, thereby obtaining a digitized measurement signal. The control circuit is configured to control the signal generator circuit to generate the RF test signal based on the digitized measurement signal, based on known error parameters of an error model of the measurement system, and based on a desired reflection coefficient at a reference plane associated with the DUT.

The invention relates to the technical field of test and measurement, and discloses a series fault arc detection method, which comprises the following steps: collecting current data of fault arc waveforms and normal arc waveforms of a plurality of different loads; performing wavelet transformation on the preprocessed current data, dynamically extracting detail coefficients of a target layer number, calculating a standard deviation, a normalized energy ratio and an energy entropy based on the wavelet coefficients, splicing peak-to-peak values to form a four-dimensional feature vector, adding a normal or fault label, and converting the feature vector into a three-dimensional tensor; the residual shrinkage module is used for constructing a deep residual shrinkage network model based on a one-dimensional convolutional neural network and introducing an attention threshold generation and soft thresholding mechanism; training the model and monitoring the performance by adopting an early stop method; and inputting label-free sample data to the model, and outputting a detection result. The problems that in the prior art, deep features cannot be reflected, the training cost is high, and overfitting is prone to occurring are solved, and the purposes of improving the accuracy, being high in stability and efficient in detection are achieved.

The invention belongs to the technical field of aero-engine vibration tests, and particularly relates to an aero-engine vibration assessment test method and system. Comprising the following steps: determining the worst vibration environment of accessories; determining the staying rotating speed of an engine rotor and the staying time of the staying rotating speed; according to the staying rotating speed of the engine rotor and the staying time of the staying rotating speed, a vibration assessment test run spectrum is formulated; based on the worst accessory vibration environment, carrying out an engine complete machine test by referring to the vibration assessment test run spectrum; generating an engine rotating speed and vibration curve graph according to the whole engine test measurement data, and making an accessory vibration limit value; an accessory vibration assessment test is carried out on a complete engine, and the complete engine used in the accessory vibration assessment test simulates the possible maximum vibration environment and test temperature of accessories in a full operation cycle and a full rotation speed range; and the installation and vibration environment is more in line with the engineering practical situation.

The invention provides a wallboard impact test device and test method for simulating a dampening load, and belongs to the field of bearing performance tests. Comprising a dampening wave impact load simulation loading module, a test wall plate is fixed through a test clamp tool module, and in the test impact process, obtained real-time monitoring data are sent to a controller of the dampening wave impact load simulation loading module through a test measurement module so as to complete closed-loop control of dynamic loads when dampening wave impact is simulated; the dampening wave impact load simulation loading module comprises a controller, a hydraulic power unit and a loading unit, and the controller compares experimental data of a dampening wave impact load real experiment with real-time simulation data obtained by the test measurement module, converts an obtained difference value into an electric signal and sends the electric signal to the hydraulic power unit; electric signals are converted into pressure loads through the hydraulic power unit, and actions are executed by the loading unit. According to the invention, the simulation effect of a real dampening wave-colliding service scene can be achieved.

To easily measure movement of a vehicle and a collision target object during a collision test.SOLUTION: A collision test measuring device 20 measures movement of a vehicle 11 and a barrier 12 during a collision test in which the vehicle 11 collides with the barrier 12. A storage section 22 stores a video of the vehicle 11 and the barrier 12 captured with a camera 13 during the collision test. A first data acquisition section 24 detects a feature point from a specific still image through image recognition based on shapes of the vehicle 11 and the barrier 12 shown in the specific still image and acquires first data in which coordinates of the feature point are associated with a capture time of the specific still image. A second data acquisition section 25 detects a characteristic point from each of a plurality of subsequent still images by tracking the feature point detected by the first data acquisition section 24 through the image recognition and acquires second data in which the coordinates of the feature point are associated with the captured time of the subsequent still images.SELECTED DRAWING: Figure 1

The invention relates to a self-adaptive engine double-duct flow test device, which comprises an air supply system A used for providing air flow in a simulated engine duct and passing through a front fan, and a duct test section C used for simulating an inner duct, an outer duct and an adjusting structure of a double-duct fan engine and carrying out a flow test between the ducts, the total pressure control system B is arranged between the air supply system A and the duct test section C; a flow matching and adjusting simulation method between the double ducts is provided, the motion law of the valve is continuously adjusted and dispersed into a plurality of steady-state working conditions for test measurement, or the motion process of the valve is dynamically measured, so that various test requirements are met. According to the invention, the flow area of the duct throat part is continuously adjustable, and the duct throat part is cooperatively matched with a duct inlet total pressure control system, so that the stability of the inlet condition of a test section is ensured, and meanwhile, the flow characteristics among multiple ducts under various different matching and adjusting working conditions are successfully reproduced; and important support is provided for deeply exploring a coupling mechanism and a flow evolution rule between the ducts.

The invention discloses a coal-fired boiler combustion optimization method, system and equipment based on machine learning and a medium, and belongs to the technical field of boiler operation optimizing.The method comprises the steps that operation parameter data and generated fly ash carbon content data are collected; constructing a machine learning model, and performing primary training on the machine learning model; the number of operation parameter data is reduced, secondary training is performed on the machine learning model, and the optimal parameter number is determined according to the fitting effect; screening the operation parameter data, and reserving the operation parameter data of which the quantity accords with the optimal parameter quantity; the method comprises the following steps: constructing a fly ash carbon content prediction model, optimizing an extreme value of the fly ash carbon content prediction model through an optimization algorithm, and determining an optimal boiler combustion operation parameter, and solves the problems that the actual measurement workload is large and the lowest fly ash carbon content cannot be obtained by only depending on a thermal-state multi-working-condition test and easily deviating from the optimal working condition; the existing prediction method has the problems that a local optimal solution is easy to generate and the generalization ability of a model is low.

The invention relates to a deep-sea mining full-process pilot test system and a use method thereof in the technical field of deep-sea mining engineering, and the full-process pilot test system mainly comprises a collecting and mining test system, a vertical lifting test system, an ore separation test system and a test measurement monitoring system, the collecting and mining test system comprises a test pool, a deep water test area, a shallow water test area, a fan, a wave maker, a circulating water pump, a mining device, a mining vehicle, a trolley, a wave absorbing plate and a trolley guide rail; the vertical lifting test system comprises a vertical pipeline and a pipeline supporting platform; the ore separation test system mainly comprises an ore separation cabin, an overflow device and a cabin entering energy dissipation device. According to the invention, test research on key technologies and equipment of each subsystem of the pipeline lifting type mining system can be carried out, more importantly, full-process test of the pipeline lifting type mining system can be carried out, collaborative operation characteristics of each subsystem are researched, and the stability and safety of the whole system are explored.

The invention discloses an undercarriage centering torque general test device and method. The undercarriage centering torque general test device comprises a rack structure, a motion decoupling mechanism, a torque conversion mechanism and a lifting mechanism. The motion decoupling mechanism converts downward displacement, rotation and coupling motion of the undercarriage strut into independent rotation and up-down displacement motion, and transmits the independent rotation and up-down displacement motion to the torque conversion mechanism to complete test measurement; the torque conversion mechanism transmits and converts torsional motion into motion in the horizontal direction through a driving gear, a driven gear, a pneumatic jaw clutch and a cam, then the motion acts on a straight spring, and force is transmitted to a pressure sensor through compression of the straight spring to complete test measurement of centering torque. According to the invention, the problems of complex device structure, poor universality and frequent spring replacement in the centering torque test are solved, the universality measurement of the centering torque of different aircraft landing gears can be realized by setting different spring pre-tightening amounts, and the device has important significance for delivery inspection of landing gears and safe take-off and landing of aircrafts.

The embodiment of the invention provides a wheel disc fracture failure prediction method and device, computer equipment and a medium, and relates to the technical field of digital twines.The method comprises the following steps that a uniaxial quasi-static tensile test is conducted on a tensile test sample, and an engineering stress-strain curve of a wheel disc is obtained; converting the engineering stress-strain curve into a true stress-strain curve; based on the true stress-strain curve, constructing a wheel disc failure prediction model under a deterministic condition; sensitivity analysis is conducted on the uncertainty quantitative parameters, sample data under different working conditions are obtained through finite element calculation based on the key parameters, a wheel disc maximum strain proxy model is constructed based on the sample data, the key parameters are input into the wheel disc maximum strain proxy model, and the confidence interval of the rotating speed of the wheel disc during fracture is obtained. According to the scheme, by constructing the wheel disc maximum strain proxy model, high-precision global simulation of the wheel disc breaking process is realized, and the problems of limited test points and insufficient simulation precision are solved.

The invention discloses a nozzle spray cone angle test system in different oil supply temperature states, which comprises a test measurement device, a control device and a control device, wherein the test measurement device is used for testing spray cone angles of a single spray nozzle and a single spray nozzle with a fuel header pipe at different fuel temperatures; and the test system has a function of performing complementary verification by manually acquiring nozzle spray cone angle data and photographing nozzle spray cone angle data by an optical camera. The nozzle spraying cone angle data obtained by manually operating the complementary verification measurement device and the nozzle spraying cone angle data obtained by shooting the optical camera are subjected to complementary verification, and the problem that the measurement data complementary verification of the nozzle spraying cone angle cannot be realized as only the camera is adopted to shoot the nozzle spraying cone angle is solved.

In a method and apparatus, an electrical load is disposed across an electric power source. First and second electrical components are disposed between first and second terminals, respectively, and the load and power source. The first electrical component is configured so that the first component passes at most a low level electric current to the first terminal upon a short circuit condition. The second electrical component is configured so that the second component passes at most a low level electric current to the second terminal upon a short circuit condition.

This invention belongs to the field of aero-engine vibration testing technology, and specifically relates to a method and system for aero-engine vibration assessment testing; it includes: determining the most severe vibration environment for the components; determining the engine rotor dwell speed and dwell time at the dwell speed; formulating a vibration assessment test spectrum based on the engine rotor dwell speed and dwell time; conducting a whole-engine test based on the most severe vibration environment for the components and referring to the vibration assessment test spectrum; generating an engine speed versus vibration curve based on the engine whole-engine test measurement data, and formulating component vibration limit values; conducting the component vibration assessment test on the whole engine, and the whole engine used for the component vibration assessment test simulates the maximum possible vibration environment and test temperature of the components across the entire operating cycle and speed range; making the installation and vibration environment more consistent with actual engineering conditions.

A test and measurement device has a port to receive a signal from a device under test (DUT), one or more analog-to-digital converters (ADC) to digitize the signal to create one or more waveforms, a display, and one or more processors configured to execute code that causes the one or more processors to: generate a histogram from the waveform, the histogram having one or more dimensions; and calculate one or more entropy values for each of the one or more dimensions. A method includes receiving a signal from a device under test (DUT) at a test and measurement device, digitizing the signal using one or more analog-to-digital converters (ADC) to produce a waveform, generating a histogram from the waveform, the histogram having one or more dimensions, and calculating one or more entropy values for each of the one or more dimensions.

The application provides a high-hypersonic wind tunnel piece water-cooled hinge torque balance measurement system and belongs to the technical field of wind tunnel test measurement.The application aims to solve the problem that the rudder surface is difficult to be externally cooled due to thin structure and the hinge torque is difficult to be measured in the prior art.The aircraft fuselage is connected with the aircraft wing and the piece water-cooled hinge torque balance in the application.The top and bottom of the piece water-cooled hinge torque balance are respectively provided with a balance upper cover plate and a balance lower cover plate.The upper end surface of the balance lower cover plate is flush with the aircraft fuselage.The balance free end, the balance measurement element and the fuselage mounting base of the piece water-cooled hinge torque balance are sequentially connected.The balance free end is connected with the measured rudder surface through an angle ear.The balance measurement element is pasted with a strain gauge, and the balance measurement element is internally provided with a water-cooled groove circuit.The application solves the problem that the measurement precision is greatly reduced due to high temperature in the high-hypersonic wind tunnel test, and the rudder surface is difficult to be externally cooled due to thin structure and the hinge torque is difficult to be measured.

A method of testing phase-based ranging includes the following. A respective first phase correction term in response to a channel sounding procedure is measured for a first carrier frequency of a carrier signal by a device under test and a test and / or measurement instrument, respectively. A first channel phase offset is calculated for the first carrier frequency based on the measured first phase correction terms. A respective second phase correction term is measured for a second carrier frequency of the carrier signal by the device under test and the test and / or measurement instrument, respectively. A second channel phase offset is calculated for the second carrier frequency based on the measured second phase correction terms. A phase is altered in order to emulate a different distance between the test and / or measurement instrument and the device under test. Further, a test and / or measurement system is described.

The invention discloses a truss type net cage netting tying stress test measuring device, and belongs to the technical field of netting testing devices. The measuring device comprises a main frame, a netting frame, a tying connector and a test netting, the main frame is a device main body, the height direction and the width direction of the main frame are telescopic so as to meet the arrangement of the test netting with different specifications, and first holes are uniformly arranged in the length direction; the netting frame is connected with the main frame through a first hole in the length direction of the main frame and provides support for the test netting, and the test netting is a test measurement object; the netting frame realizes the adjustment of the arrangement angle by adjusting the position of the first hole connected with the main frame so as to adapt to the stress measurement under different test netting arrangement angles; one end of the tying connector is connected with the test netting, and the other end is connected with the netting frame. According to the device, through the flexibility and adjustability of the structural design, accurate measurement of netting tying stress under the conditions of different specifications, different laying angles and different pretension forces is realized.

1. The name of the design product: data collector (chassis type). 2. The use of the design product: the design product is used for intelligent testing and analysis of structural mechanical properties in the field of testing, measurement and control. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

To selectively display only a waveform of interest from many acquired waveforms with an intuitive operation.SOLUTION: A test measurement device acquires a plurality of waveforms from a device under test, stores the waveforms in a memory, and displays the plurality of acquired waveforms on a display section by overlaying the acquired waveforms. A user can visually select a waveform of interest by drawing a box such as regions of interest 302, 304, and 306 from a user input section. Then, the test measurement device updates the waveform display of the display section so as to display only a waveform determined to be in the regions of interest 302, 304, and 306 from the plurality of acquired waveforms.SELECTED DRAWING: Figure 3

The utility model discloses a clamping device of a track capturing test measuring platform, which comprises a clamping through hole arranged on the measuring platform, clamping sinking grooves are arranged on the front end face and the rear end face of the clamping through hole, more than one guide groove is arranged on the bottom face of each clamping sinking groove around the opening of the clamping through hole, and correspondingly, the clamping sinking grooves are arranged in the guide grooves. More than one movable clamping block which is attached to each other is further arranged around the opening of the clamping through hole, and a rotating disc is further arranged in the clamping sinking groove; in the clamping sinking groove, the movable clamping block and the rotary disc are sequentially stacked in the axial direction from inside to outside. The turntable is provided with more than one driving groove along the circumferential direction; guide columns are arranged on the inner end face and the outer end face of the movable clamping block, the guide columns located on the inner end face are in sliding connection with the corresponding guide grooves, and the guide columns located on the outer end face are in sliding connection with the corresponding driving grooves. According to the utility model, through adjusting the clamping device of the measuring platform, measurement and adjustment of postures of different hanging objects can be realized.

A configuration command lookup method, measuring instrument, test system, and program product are disclosed, relating to the field of electronic test and measurement instrument technology. The configuration command lookup method, applied to a measuring instrument, includes: acquiring pre-stored function association mapping information, which includes multiple parameter status items of the measuring instrument and their corresponding parameter identifiers; responding to a configuration operation performed by a user; acquiring parameter status items that have changed during the configuration operation, and determining the parameter identifier corresponding to the changed parameter status item based on the function association mapping information; acquiring a pre-stored parameter mapping table, which includes each parameter definition item in the measuring instrument, its corresponding configuration command, and parameter identifier, wherein the parameter identifier corresponding to the parameter definition item corresponds one-to-one with the parameter identifier of the parameter status item; searching for the parameter identifier of the changed parameter status item in the parameter mapping table, and determining the configuration command for the changed parameter status item based on the parameter identifier.

The present application relates to the technical field of ship test measurement, in particular to an automatic water surface ship inclination and still water roll test measurement method. The present application obtains the draft of the ship during the inclination test by loading the camera integrated with the image recognition function on the unmanned ship and cooperating with the water level monitor, simultaneously generates a certain roll angle of the ship by moving the weight (inclination test weight) of a known weight on the ship, and automatically obtains the roll angle of the ship body through the ship body posture measurement module; then, through the data processing module, the draft, roll angle and torque of the moving weight measured are used to deduce the center of gravity position and displacement of the ship based on the ship statics principle; compared with the prior art, the present method has high automation degree, more accurate data reading, higher data time consistency, can effectively avoid human error, reduces the test risk, and greatly improves the test efficiency.

A method for extracting the 3D wall thickness of a flexible rubber workpiece based on SAD stereo matching and collaboration with high-precision equipment. The present invention aims to solve the problem of high-precision measurement of the wall thickness of flexible rubber products, and proposes a method for extracting the 3D wall thickness of a flexible rubber workpiece based on SAD stereo matching and collaboration with high-precision equipment. The method is implemented through the following steps: 1. industrial camera calibration; 2. obtaining the image to be detected; 3. image preprocessing; 4. edge extraction; 5. SAD stereo matching; 6. collaborative splicing with high-precision equipment based on image features; 7. 3D determination of feature wall thickness; 8. testing the robustness of the measurement method and numerical consistency analysis. The present invention combines high-precision equipment control and image processing algorithms in the field of visual measurement of flexible materials, achieving high-precision shooting and splicing detection of various types of workpieces, overcoming the difficulties of large errors in conventional manual measurement and poor robustness of general measurement methods for various types of workpieces, with high accuracy and high speed.

The utility model relates to the technical field of test and measurement, and discloses a semi-permeable membrane sample gas selector for greenhouse gas on-line monitoring, which comprises a low-temperature cold trap device and an eight-port gas rotary valve, the low-temperature cold trap device comprises a low-temperature cold trap body, a plurality of gas sample inlets are arranged at the rear end of a shell of the low-temperature cold trap device, and the eight-port gas rotary valve is arranged in the shell of the low-temperature cold trap device. A plurality of input interfaces and output interfaces are arranged on the eight-port gas rotary valve, the plurality of input interfaces can be communicated with the plurality of gas sample injection ports one by one through guide pipes, and a filter is arranged at one end, far away from the eight-port gas rotary valve, of each guide pipe. According to the semi-permeable membrane sample gas selector provided by the utility model, except for the semi-permeable membrane tube of a finished product assembly, the used conduits all adopt 1 / 8 inch silanization stainless steel tubes, so that the gas replacement speed in structures such as a low-temperature cold trap body and an eight-port gas rotary valve is increased, the gas adsorption is reduced, and the quick response of gas output is realized.

Aspects of the subject disclosure may include, for example, performing signal measurements in a wireless network. An area of interest within a coverage area of the communications network may be identified based on the signal measurements. Zones within the area of interest may be further identified. Additional test measurements within the area of interest may be requested. Test devices may be dispatched to locations within the area of interest to perform the additional test measurements. Other embodiments are disclosed.

The application belongs to the technical field of test measurement, and discloses a single-motor multi-propeller ship model self-propulsion test device and a shafting parallel module. The shafting parallel module comprises: a driving rotating device, combined driven rotating devices arranged on both sides of the driving rotating device; each group of the combined driven rotating devices comprises a first driven rotating device and a second driven rotating device, and the driving rotating device, the first driven rotating device and the second driven rotating device are connected through rotating connecting devices. Meanwhile, the single-motor multi-propeller ship model self-propulsion test device is designed based on the shafting parallel module, so that the shafting connection and transmission during the single-motor multi-propeller ship model self-propulsion test are realized. The shafting parallel module can quickly adapt to any propeller spacing within a certain range, reduces installation adjustment redundancy, has high transmission efficiency, and can be used to complete the ship model self-propulsion test and carry out research on ship propulsion efficiency and ship engine propeller matching.

The invention relates to the technical field of power system relay protection, and discloses a transformer gas relay maloperation prevention simulation method based on flow field analysis. Comprising the steps of preparation of a geometric simulation model, generation of a computational domain, division and independence test of computational grids, generation of boundless layer grids, delimitation of boundary conditions and analysis of fluid simulation results and test measurement errors. The method comprises the following specific steps: step s1, preparing a geometric simulation model; step s1.1, constructing a three-dimensional structure model in the gas relay; according to the method, a simulation-test two-way error tracing method is adopted, nine kinds of error sources such as key parameters (such as a simulation value 1.301 m / s vs actual measurement mean value 1.299 m / s), quantitative model simplification, grid quality and sensor precision) such as action flow speed and action time are compared, the prediction accuracy of a verified simulation model reaches 98.7%, quantifiable theoretical support is provided for relay maloperation resistance design, and the method has the advantages of being high in reliability, high in reliability and the like. And a bidirectional error analysis mechanism is realized to guarantee the simulation reliability.

The utility model discloses a kind of collapse pit dewatering aggregation simulation test devices, it is related to testing, measurement technical field.It includes collapse pit simulation system, dewatering simulation system and information acquisition system.Collapse pit simulation system adopts box without top cover, and the collapse pit of different working conditions, filling material can be constructed, so different filling, collapse pit gradient can be simulated test;Dewatering simulation system can spray water body to collapse pit simulation system, and dewatering simulation system can control dewatering height, dewatering area, dewatering intensity and dewatering time by lifting frame, dewatering nozzle, adjustable transformer, timing socket, so that the collapse pit of multiple working conditions can be carried out dewatering aggregation similar simulation test;Information acquisition system obtains the moisture content, pressure and temperature etc. Information of inside filling of collapse pit, it is favorable to ascertain the aggregation behavior of collapse pit dewatering under different working conditions, provide basis for collapse pit ponding management, thereby reduce underground debris flow risk, guarantee mine safety and efficient production.