127 results about "Test measurement" patented technology

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.

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.

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.

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 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.

A test and measurement device is described, comprising one or more detection devices configured to receive an event from a corresponding event generator. The test and measurement device also includes a transmitter configured to receive the event from the one or more detection devices and transmit the event. The test and measurement device also includes one or more comparators configured to receive the event from the batch transmitter and forward the event to a corresponding event detector based on a comparison of an event identifier and a detector identifier.

The utility model discloses a motor locked-rotor test tool, which comprises a test bench and a locked-rotor frame fixedly connected to the upper end of the test bench, a connecting seat for mounting a test motor is movably arranged above the test bench, a power shaft is fixedly connected to the power end of the test motor, and an open slot is arranged on the outer side of the test bench in a penetrating manner. A sliding groove communicated with the open groove is formed in the upper end of the test bed in a penetrating mode, a sliding block is movably arranged in the open groove, the sliding block slidably penetrates through the sliding groove and then is fixedly connected to the bottom of the connecting base, a fixed clamping base is fixedly arranged at the bottom of an inner cavity of the locked-rotor frame, and a movable clamping base is longitudinally and movably arranged at the top of the inner cavity of the locked-rotor frame. According to the utility model, the motor locked-rotor test is carried out by adopting relatively automatic test steps, the operation is simpler, the power shaft of the motor is more stably limited and fixed, the looseness in the locked-rotor test is avoided, the test measurement result is ensured, and the whole structure is reasonable and attractive in arrangement and high in practicability.

A test and measurement system comprises one or more test and measurement devices, wherein at least one test and measurement device includes one or more ports for connecting to a device under test (DUT), one or more user interfaces, a generative artificial intelligence (AI) model connected to the one or more test and measurement devices, and one or more processors to provide an application programming interface (API) of the generative AI model, receive a protocol specification and provide the protocol specification for the generative AI model, receive configuration settings for a bus operating according to the protocol via one of the one or more user interfaces, provide the configuration settings for the generative AI model, receive a decoder file from the generative AI model, and provide the decoder file on the test and measurement device.Using the decoder file on the test and measurement device to test a DUT.

The utility model particularly relates to a standard penetration test device based on automation. In the application, the guide rod is arranged to guide'vertical falling 'and'vertical lifting' of the standard hammer, and on the basis, the chain is driven to move through the upper gear and the lower gear, so that the standard hammer which freely falls to the bottom is lifted to a preset initial falling height in a reciprocating manner based on the release arranged on the outer side of the chain, and continuous and constant-speed automatic hammer falling hammering is realized; through mechanical automatic assembly line transmission, manual operation can be liberated, and the test efficiency is improved while the test operation risk is reduced. The preset initial falling height and the preset grounding height of the standard hammer can be accurately controlled by adjusting the set heights of the upper gear and the lower gear in combination with actual working conditions; and in combination with the revolutions of the upper gear and the lower gear, the falling striking times of the standard hammer are counted, and the accurate striking times of the standard hammer are visually displayed on the basis of a counting display screen. Therefore, the test measurement error is greatly reduced.

An input selector for electrically connecting one of a plurality of test signals from one or more devices under test to a test and measurement instrument, the input selector includes a first multiplexer having a first set of multiple inputs, each of the first set of multiple inputs coupled to a different one of the plurality of test signals from one or more devices under test, and having a first output of a selected one of the first multiple inputs, and a second multiplexer having a second set of multiple inputs, each of the second set of multiple inputs coupled to a different one of the plurality of test signals from the one or more devices under test, and having a second output of a selected one of the multiple inputs. Methods are also described.

This invention provides a method, apparatus, computer equipment, and medium for predicting the failure of a wheel disc, relating to the field of digital twin technology. The method includes the following steps: conducting a uniaxial quasi-static tensile test on a tensile test specimen to obtain the engineering stress-strain curve of the wheel disc; converting the engineering stress-strain curve into a true stress-strain curve; constructing a wheel disc failure prediction model under deterministic conditions based on the true stress-strain curve; performing sensitivity analysis on the quantified parameters of uncertainty; obtaining sample data under different working conditions through finite element calculation based on key parameters; constructing a maximum strain proxy model for the wheel disc based on the sample data; inputting the key parameters into the maximum strain proxy model to obtain the confidence interval of the wheel disc's rotational speed at the time of failure. This scheme, by constructing a maximum strain proxy model for the wheel disc, achieves high-precision full-domain simulation of the wheel disc's failure process, solving the problems of limited test measurement points and insufficient simulation accuracy.

To predict a future failure of hardware under test (HUT).SOLUTION: The test and measurement instrument includes one or more ports connected to the HUT31, sensors 30 connected to the HUT31 and the test and measurement instrument 32, a display for displaying representations of one or more signals from the HUT31 and the sensors 30, and one or more processors. The one or more processors are configured to execute a program that causes the one or more processors to obtain one or more datasets from the sensors 30, apply one or more machine-learning models 36 to the one or more datasets, and receive a predictive analysis result for the HUT31 from the one or more machine-learning models 36.SELECTED DRAWING: Figure 2

The invention belongs to the technical field of electronic information and wind tunnel test measurement, and particularly relates to a wind tunnel six-component balance dynamic decoupling method and application based on multi-mode transfer learning and physical constraint, and the method comprises the following steps: feature extraction and data preprocessing; the preprocessed data features are input into a pre-trained convolutional neural network ResNet-18 model, and hierarchical data feature extraction is carried out; the processed image feature data, strain feature data and vibration and temperature feature data are input to a full splicing layer for heterogeneous fusion splicing, the spliced data are input to a pre-trained machine learning regression XGBoost model for feature fusion regression and mapping, and finally six aerodynamic force / torque components acting on the aircraft are output. Through fusion of multi-modal transfer learning and physical constraint, in actual measurement of subsonic and hypersonic wind tunnels, the dynamic decoupling precision is improved by more than 50% and 65% compared with a traditional least square method and a polynomial method.

The present application relates to a kind of program-controlled resistance card and its program-controlled resistor smooth control method, device, wherein the method includes obtaining the resistance card coding combination corresponding to current resistance value and target resistance value;Difference mask is calculated by exclusive or operation, and the relay set to be changed is identified;Based on the strategy of greedy algorithm, in the form of successive single-step switching, the relay that makes instantaneous resistance value closest to target value is selected from the set identified by difference mask and is operated;Switching and state updating are iteratively executed until difference mask is zero;Finally, switching completion signal is output.The device includes state acquisition, difference analysis, switching decision and driving execution module, and through the orderly single-step relay switching control, smooth transition in the resistance value change process is realized, the extreme state such as open circuit or short circuit is effectively avoided, the switching precision and system reliability are significantly improved, and it is suitable for precision test measurement and automation control field.

A test and measurement instrument comprises an input for receiving a pulse-amplitude modulated n-level signal (PAMn), an analog-to-digital converter (ADC) coupled to the input to digitize the PAMn signal, a capture memory coupled to the ADC and configured to store at least a portion of the digitized PAMn signal as a waveform, a trigger circuit coupled to the ADC and the capture memory to generate a trigger signal to cause the test and measurement instrument to initiate waveform acquisition, a PAMn clock and data recovery (CDR) circuit configured to decode bits from the PAMn signal, and a transition detection logic circuit coupled to the PAMn CDR circuit and the trigger circuit to detect symbol transitions based on the decoded bits and to initiate the trigger circuit.The trigger signal is designed to generate a response to the detection of a specific symbol transition.

This utility model discloses a relay oil flow measurement device, including a measuring device and a pressure flange disposed at both ends of the top of the relay. The relay includes a relay piston, a relay cylinder, a relay rear end cover, and a relay front end cover. The measuring device and the pressure flange are respectively connected to the relay rear end cover and the relay front end cover. The oil flow measurement device also includes a pressure device, the output end of which is connected to the measuring device and the pressure flange. The beneficial effect of this utility model is that the device can also be used for relay pressure work and driving the relay piston movement. The device can accurately measure the oil flow between the relay piston and the cylinder, providing a test measurement means for relay maintenance quality.

To calibrate a magnetic field probe which measures current of a device to be tested without surrounding the device to be tested.SOLUTION: A test and measurement device for measuring current in a device under test (DUT) 112, comprises a port 12 for receiving signals from a magnetic field probe 104, and a processor 106. First, while a power source of the DUT 112 is turned off, known current for calibration is supplied to a current transmission conductor in the DUT 112. The processor 106 is configured to measure a magnetic field based on the known current generated in the current transmission conductor from a signal from the magnetic field probe 104 to determine a calibration factor based on the known current and a measured value of the magnetic field. Next, when the power source of the DUT 112 is turned on, the processor 106 is configured to measure a magnetic field based on unknown current generated in the current transmission conductor from the signal from the magnetic field probe 104 to calculate a calibrated measured value of the unknown current by using a measured value of the magnetic field and the calibration factor.SELECTED DRAWING: Figure 1

An overhauling performance automatic testing device of an operating mechanism and a testing method thereof, comprising a stroke simulation display module, an energy storage motor control module, a stroke node measurement module, an oil pressure measurement module, a pressure relief valve control module, a switching control module and a testing system module, the testing system module is used for controlling the stroke simulation display module, the energy storage motor control module, the stroke node measurement module, the oil pressure measurement module, the pressure relief valve control module and the switching control module to operate coordinately, and displaying the testing result. Through the cooperation of the above modules, the performance test of the overhauled operating mechanism is realized, the measurement time is greatly reduced, the measurement accuracy is greatly improved, the efficiency of the operating mechanism performance test is improved, and it has great significance for guaranteeing the stable operation of the power grid.

The application discloses a grouting body surface roughness numerical calculation method, device, equipment and program product, and the method comprises the following steps: obtaining the porosity and grading curve of the soil body in the grouting area; determining the modeling information based on the grading curve, and constructing a cubic sample box by using discrete element software; generating spherical sample particles in the cubic sample box according to the porosity and the grading curve, and then running the model by parameter assignment until balance is reached to obtain a target sample; collecting a plurality of cross sections in the target sample; quantifying the total rough volume of each cross section based on all the spherical sample particles on the cross section; based on the total rough volume, the surface roughness of each cross section is obtained by using the principle of sand filling method; and the average value of the surface roughness of all the cross sections is obtained to obtain the grouting body surface roughness. The application replaces the preparation and test measurement of the physical sample by discrete element numerical simulation, greatly improves the efficiency and repeatability of the roughness measurement, and can be widely applied to the field of electric digital data processing technology.

The application discloses a kind of high-speed centrifuge in-situ heating under high temperature of high speed effect temperature calibration test method.Determine the parameters of centrifuge and test sample, install a temperature calibration sample and multiple test samples in sample chuck and insert thermocouple;In the case of not starting centrifuge, keep still, vacuum control temperature system controls inductive heating system, circulating water cooling system work to test sample and temperature calibration sample to apply temperature load, after temperature reaches predetermined temperature and keeps temperature;Analysis and processing obtain the parameters of upper and lower induction coils when formal test measurement;Remove temperature calibration sample, replace test sample, start the main shaft rotation of centrifuge again and reach speed, control according to the parameters obtained in the fifth step until test sample is pulled off and broken.The application solves the deficiency that current high-speed radiation heating can only check ambient temperature but cannot accurately check sample temperature under high speed, and can directly check sample temperature under high speed, so that the temperature of test component is more accurate.

The system according to this embodiment aims to alleviate future economic anxieties and enable users to plan for the future they desire. [Solution] The system according to the embodiment comprises a measurement unit, a questioning unit, a generation unit, a planning unit, and a support unit. The measurement unit performs aptitude tests and measures the user's cognitive abilities. The questioning unit asks questions based on the data obtained by the measurement unit. The generation unit generates future image videos based on the answers obtained by the questioning unit. The planning unit calculates learning plans and expenditures based on the videos generated by the generation unit. The support unit supports income increase based on the plans calculated by the planning unit.

The invention provides a single-phase electric energy meter buckle type on-site clock error verification device, method and system, and relates to the technical field of test and measurement. The device comprises a main body and a display screen, a crimping panel is arranged on the lower end surface of the main body; a plurality of crimping needles are arranged on the crimping panel, and the crimping needles are matched with crimping holes formed in the single-phase electric energy metering device to realize crimping; a locking nut is arranged on the main body, the locking nut penetrates through the main body from top to bottom, and the locking nut is matched with a threaded hole formed in the single-phase electric energy metering device to fix the main body on the single-phase electric energy metering device; the crimping needle comprises a signal crimping needle connected to the pulse per second; a processing module, a communication module and a standard clock pulse module are arranged in the main body. According to the invention, the signal obtained by the second pulse signal crimping needle is compared and verified with the signal of the standard clock pulse module, so that the field verification of the clock data in the single-phase electric energy meter is realized.

The present application relates to the technical field of tooling, and particularly relates to a resonance loosening method and system for a casing-coupling sub-system. The method comprises: obtaining a make-up torque of the casing-coupling sub-system, determining a maximum loosening torque according to the make-up torque; determining basic parameters of the casing-coupling, establishing a finite element model according to the basic parameters, carrying out modal simulation analysis and test measurement according to the finite element model, and determining an inherent frequency of the casing-coupling sub-system, a position of an excitation point and an excitation acceleration; according to the excitation point and the excitation acceleration, a middle / high frequency excitation device is used to apply vibration excitation under the inherent frequency to the casing-coupling sub-system, a larger resonance amplitude and resonance acceleration are excited in the casing-coupling sub-system, a violent transverse or longitudinal swing is generated at the coupling, a loosening effect is generated, the loosening torque of the casing-coupling sub-system is significantly reduced, and efficient unmake-up is ensured.

The gas permeation amount of each of a plurality of rubber sealing components manufactured according to the same specifications is measured by helium leak testing, and for each sealing component, sample data is acquired which is formed of a pair of a measurement value at a criterion time CT in an unstable period A, during which the permeation amount increases, and a measurement value in a stable period B, during which the permeation amount is stable (sample acquisition). The relationship between the measurement value at the criterion time CT and the measurement value in the stable period is defined by a linear function on the basis of the plurality of acquired sample data (function definition). The gas permeation amount of a sealing component to be inspected which has been manufactured according to the same specifications as those for the plurality of rubber sealing components is measured by helium leak testing, and a measurement value in the stable period B is estimated, using the defined linear function, on the basis of the measurement value in the unstable period A of the sealing component to be inspected (leakage amount estimation).