354 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 discloses an asphalt pavement structure performance analysis method and system, relates to the technical field of road engineering, and aims to solve the problem that an asphalt pavement structure performance analysis model is insufficient in self-adaptability, and the asphalt pavement structure performance analysis method comprises the following steps: obtaining test measurement data of a drop weight deflectometer; combining the adjacent structural layers according to the similarity of the structural layer materials; different numerical simulation models are established according to different configuration parameter combinations, and structural performance evaluation indexes are calculated respectively; different samples are established according to different numerical simulation models, weights of different samples are calculated and normalized, and a sample training structure performance index calculation model is established and input; and calculating a structural performance evaluation index of the target road section according to test measurement data of the drop weight deflectometer of the target road section by applying the structural performance index calculation model. According to the asphalt pavement structure performance analysis method and system provided by the invention, the attention of the trained model to a specific sample can be improved, and the adaptive ability and prediction precision of the trained model are improved.

The invention discloses a method and device for measuring flow-induced vibration of a plate-type fuel assembly, and belongs to the field of nuclear power. The flow-induced vibration measurement method for the plate-type fuel assembly comprises the following steps: firstly, carrying out a flow-induced vibration test on a fuel plate of which the two ends are clamped and fixed, and carrying out measurement to obtain strain data and displacement data of a measurement point location on the fuel plate; establishing a simulation model of the fuel plate, simulating a flow-induced vibration behavior, verifying a calculation result and measurement data, and iterating the simulation model according to a verification result to obtain a calibration model with an error smaller than a given threshold value; a plate-type fuel assembly test piece with a plurality of fuel plates is used for carrying out a flow-induced vibration test, strain data of corresponding measurement points of the fuel plates are measured, and corresponding flow-induced vibration displacement data are given according to the strain data by using a calibration model. The invention further provides a plate type fuel assembly flow-induced vibration measuring device.

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.

The embodiment of the invention provides a scalar field simulation and real-time data processing method and device, and the method comprises the steps: carrying out the test time matching of scalar field data according to the field actual measurement real-time data and simulation result data, and carrying out the point-to-point comparison of the obtained test scalar field data and the scalar data in the simulation result data, determining a corresponding scalar distribution comparison result; selecting a position corresponding to the test point as a selection position of a simulation model node corresponding to the physical three-dimensional model, performing average scalar processing on the similar region in the simulation model, and taking the simulation model subjected to the average scalar processing as a space point matched with the test point to obtain a corresponding scalar comparison result; according to a scalar distribution comparison result and a scalar comparison result, correcting simulation parameters of the physical three-dimensional model in the test virtual scene; according to the method, the simulation data and the real-time data can be effectively combined, so that more accurate product performance evaluation and optimization are realized.

The invention provides a CHF test data validity evaluation method and device and a readable medium. The CHF test data validity evaluation method comprises the steps of obtaining CHF test data of multiple working conditions; performing test key parameter control stability analysis, test data repeatability analysis, test measurement CHF value change rule analysis along with key parameters, special phenomenon analysis and test heat loss analysis on the CHF test data, and evaluating data validity according to analysis results. According to the invention, the validity of test data is evaluated from five aspects of test key parameter control stability, test data repeatability, a change rule of a test measurement CHF value along with key parameters, a test special phenomenon and test heat loss, so that the rationality of CHF test data can be systematically evaluated in multiple aspects; the test data is reasonable and effective and can be used for subsequent calculation, analysis and research.

The invention belongs to the technical field of aircraft test measurement, and particularly relates to an aircraft body space coordinate positioning method and device in an aircraft test. The method comprises the following steps: S1, acquiring coordinates of a measuring device under an overall coordinate system of an aircraft; s2, controlling a lens on the measuring device to deflect so as to lock a positioning point of a to-be-determined coordinate on the surface of the machine body, and acquiring a deflection angle and a pitch angle of the measuring device; s3, acquiring a linear distance between the measuring device and the positioning point; and S4, calculating the coordinates of the positioning points. According to the invention, the method can achieve the precise positioning of the surface point of the airplane, and improves the positioning measurement efficiency.

The invention discloses an integral test measurement method suitable for a main shielding structure of a low-temperature liquefied natural gas thin film tank. The method comprises the following steps of (1) checking before test, (2) standard integral test, (3) airtightness test during completion of a storage tank, (4) integral test after a temporary construction hole is closed, and (5) analysis and checking. According to the measurement method, data related to the overall sealing performance of the main shielding structure of the storage tank are obtained in the mode that the negative pressure difference is established between the heat insulation layer space and the storage tank and the pressure difference change is recorded, and the defects that traditional thin film tank main shielding sealing performance detection is low in work efficiency and insufficient in accuracy are overcome. Meanwhile, the invention provides a systematic detection sequence and steps of inspection before test, standard overall negative pressure test calibration, airtightness test during completion of the storage tank, overall test after closing of a temporary construction hole, analysis and inspection, and provides a technical means for improving the integrity and safety of the shielding structure of the low-temperature liquefied natural gas film tank. The defects of low working efficiency and insufficient accuracy in the prior art are overcome.

The invention belongs to the related technical field of printing material mechanics research, and discloses a discrete element modeling method and system for the compaction behavior of a printing material, and the method comprises the steps: S1, building a discrete element model of the compaction behavior of the printing material, and determining to-be-optimized parameters in the model and the range of the to-be-optimized parameters; establishing an objective function according to a deviation between a numerical calculation result obtained by discrete element model simulation and a test measurement result; s2, establishing a distributed reinforcement learning model: designing a state space according to the target function value and each parameter, and setting a reward structure and an action space of each to-be-optimized parameter, the reward structure being a reciprocal of the target function value; and S3, parameter inversion is carried out through the distributed reinforcement learning model, each optimized parameter is obtained, and discrete element modeling is completed. According to the method, the model parameters are optimized and determined through parameter inversion in the discrete element model based on the distributed reinforcement learning algorithm, the speed and efficiency of parameter inversion are improved, and the parameter inversion is more accurate.

The invention discloses a multifunctional granular material repose angle calibration test device, and belongs to the technical field of granular material repose angle measurement. The device comprises a long cylinder lifting device, a parameter measuring platform, a particle pushing device, a particle filling and recycling device and a long cylinder, through ingenious cooperation of all the components, automatic cylinder changing, long cylinder clamping and lifting, parameter measurement and particle pushing and recycling are achieved; the automation level of a granular material repose angle measurement test is improved, and a large amount of manpower, material resources and time are saved; the granular material repose angle measuring device improves the test process of granular material repose angle measurement, reduces the test measurement error, improves the working efficiency, achieves the effect of centralized three-dimensional operation, saves the test space and cost, and makes a prominent contribution to the measurement of the granular material repose angle.

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.

1. The name of the product of this design: signal generator. 2. Purpose of the product of this design: electronic measuring instrument used for testing, measuring and analyzing continuously changing input signals. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.

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