352 results about "Calibration test" patented technology

The invention relates to an AI server cooling water pump vibration quantity self-adaptive calibration test method and system, an intelligent test platform integrates a six-dimensional force sensor and a temperature compensation vibration exciter, the platform rigidity is automatically calibrated, a water pump-pipeline system transfer function is obtained, and a rotating speed-lift-modal frequency three-dimensional mathematical model is established; a three-axis MEMS accelerometer array is arranged at sensitive parts such as a water pump bearing seat and a motor shell, and vibration, current and pressure signals are synchronously collected; carrying out time-frequency domain signal processing by adopting variational mode decomposition in combination with self-adaptive S transformation, and extracting a 128-dimensional full-frequency domain feature vector containing a modulation side frequency band; effective values of vibration acceleration, speed and displacement are calculated through a frequency domain integration algorithm, and current harmonic interference is corrected through an electromagnetic vibration compensation model; and finally, a vibration health degree evaluation model containing 18 characteristic parameters is established based on a support vector machine, the test system comprises an intelligent test platform unit, a multi-source sensing unit, an edge calculation unit and a data management unit, and microsecond-level synchronous acquisition and GB-level data throughput are realized through a time sensitive network. And online incremental learning and automatic generation of a test report are supported. The method has the effect of improving the water pump vibration quantity test precision.

The invention relates to wide-range multi-component sensor calibration equipment and a wide-range multi-component sensor calibration method. The method comprises the following steps: firstly, checking equipment parts and setting a target temperature range and a compensation model of each temperature interval; then, dynamic temperature control is started, jig deformation is monitored in real time, a transient temperature gradient suppression technology is applied, multi-physical-quantity calibration is executed, and a compensation measurement value is output; then setting multi-environment coupling calibration test conditions to simulate actual working conditions, and monitoring and recording calibration data of each physical quantity; and finally, calculating a calibration error by combining a calibration result and a reference standard value. According to the process, by precisely setting parameters and combining dynamic control, real-time monitoring and multi-physical-quantity calibration, the transient temperature gradient influence is effectively inhibited, and the measurement precision of the sensor in a complex environment is ensured; the temperature control performance is improved through the micro soaking film and the intelligent temperature control strategy, the actual working condition is simulated through multi-environment coupling testing, the accuracy and reliability of the calibration result are remarkably improved through compensation and error calculation, and guarantee is provided for precise application of the sensor.

The invention relates to the technical field of reflectivity factor testing, and discloses a weather radar reflectivity factor precision calibration testing system, which comprises a radar data acquisition module for acquiring reflectivity factor data and finishing time synchronization by adopting an IEEE1588 protocol; the reference data management module is used for generating an electronic reference data set by utilizing a block chain technology; the calibration processing module is used for performing multi-source joint correction on the reflectivity factor data, the rain gauge data, the standard meteorological target template and the environmental parameters, and outputting the corrected reflectivity data; the precision verification module is used for carrying out real-time precision test on the correction data based on a sliding window, continuously generating test results, forming a precision evaluation vector by adopting weighted average, extracting a quality index to obtain a comprehensive score, and judging whether the correction data is normal or abnormal; and the alarm and report module is used for triggering graded alarm in case of abnormity and generating a calibration certificate and a test report. According to the invention, the precision monitoring capability is improved, manual judgment errors are reduced, and the operation efficiency is improved.

The invention relates to the technical field of highway bridge safety monitoring, in particular to a bridge dynamic weighing algorithm based on Bayesian maximum posterior probability. Obtaining influence lines through a bridge calibration test, and calculating an influence line matrix, a mean value and a covariance; using a Moses algorithm to obtain the vehicle axle load as the axle load of the initial main cycle i = 0; initial axle load distribution is set, the covariance of load response is obtained through the influence line covariance, the measurement noise and the axle load of the main cycle, and an axle load mean vector and a stable value of the covariance are iterated together with the influence line matrix, the initial axle load distribution and the load response to serve as the axle load distribution of the main cycle; according to the axle load distribution, the influence line matrix, the load response and the covariance thereof, the posterior probability of the axle load is obtained, and the axle load when the probability is the maximum serves as the axle load corresponding to the (i + 1) th main cycle; and repeating until the axle load update difference value is smaller than the preset value, and outputting the axle load result, thereby solving the problem of low axle load identification precision of the existing bridge dynamic weighing system.

The invention discloses a calibration test method and system for a pressure sensor, and relates to the technical field of pressure sensor calibration. According to the method, original temperature and voltage data are collected in real time, ideal pressure is obtained through an ideal state equation, original output voltage is obtained through a preset relation model in combination with the temperature, then precise compensation of zero drift and sensitivity drift is completed in sequence through a multi-dimensional calibration coefficient, and further correction is performed through a linear regression relation polynomial, so that the accuracy of the zero drift and the sensitivity drift is improved. And finally, a detection pressure value is obtained. The output pressure value is closer to the real physical quantity, the application requirements of high-precision scenes such as medical equipment are met, and the calibration effect and the pressure measurement precision are improved.

The invention discloses a cable strength detection method and system, relates to the technical field of cable detection, and solves the technical problems that the metal cable detection process is not standard, the defect positioning and quantification precision is low, the contradiction between the non-metal cable detection efficiency and precision is prominent, and microscopic verification is lacked. A high-frequency arc-shaped phased array probe, a bicrystal oblique TOFD probe and an oil-based high-viscosity coupling agent are adopted, a layered focusing technology is combined, laser ultrasonic non-contact detection and ultrasonic microscope high-resolution imaging are adopted for a non-metal cable, and spiral scanning and circumferential fixed-point scanning are combined, so that the defect omission ratio in the circumferential direction is reduced; the abnormal region judgment takes a calibration test block as a reference, the misjudgment rate is reduced, the authenticity is verified through coarse scanning and locking of a core region, fine scanning and acquisition of a high-resolution image and multi-angle imaging, the defect type judgment basis is clear, and the misjudgment rate is reduced.

The invention relates to the field of lithium ion battery health state evaluation, and discloses a lithium ion battery life in-situ rapid prediction method and device, and the method comprises the steps: carrying out a battery capacity calibration test, and obtaining a first calibration capacity Q1 of a battery; installing the battery in a mechanical system of the measuring device, and setting an initial pre-tightening force; standing the mechanical system of the measuring device for a preset standing time, and then testing the capacity calibration of the battery again to obtain a second calibration capacity Q2 of the battery; when the value of Q1 / Q2 is higher than a preset ratio, carrying out charge-discharge circulation on the battery, and in the charge-discharge circulation process of the battery, collecting the pressure change of the battery in the longitudinal direction, namely a pressure change curve of expansion force; and establishing an expansive force change fitting formula in the circulation process according to the pressure change curve of the expansive force, and predicting the service life of the battery according to the relationship between the expansive force and the calibrated capacity of the battery. By using the scheme of the invention, early warning of the advance can be realized, the algorithm is simple, and the applicability is high.

The invention relates to a locomotive coupler calibration test bench, and the test bench comprises a pressurization device which is used for providing the two ends of a to-be-tested coupler with opposite acting forces; the hoisting device is adjacent to the pressurizing device; the protection device is located on the outer side of the pressurizing device, and the protection device is configured to be switched between a first state for shielding the whole area of the pressurizing device and a second state for exposing at least part of the area of the pressurizing device. After the to-be-tested car coupler is hoisted to the pressurizing device through the hoisting device, acting force in opposite directions can be provided for the two ends of the to-be-tested car coupler through the pressurizing device, a conventional mode of applying traction force through locomotive traction is replaced, the force application control precision in the car coupler force calibration process is improved, and then the calibration result precision is improved; and train operation safety is guaranteed. Moreover, in the test process, the precision of the calibration result can be prevented from being influenced by foreign objects through the protection device, and meanwhile, the operation safety of testers is improved.

According to the embodiment of the invention, leakage characteristic data of a plurality of sensors are collected in real time; performing filtering processing on the leakage characteristic data and then determining an area where a leakage source of the vacuum equipment is located; determining the confidence coefficient of the area where the leakage source is located, determining the confidence coefficient of the position of the leakage source based on the confidence coefficient of the area where the leakage source is located, and giving an alarm when the confidence coefficient of the position of the leakage source reaches a confidence threshold value; and injecting helium to the leakage source position of the vacuum equipment in a preset time period to perform calibration test, calculating a calibration error of the leakage source position of the vacuum equipment, and when the calibration error exceeds an error threshold value, recalculating the confidence coefficient of the leakage source position and resetting the confidence coefficient threshold value. The problems of high cost, low detection precision, slow response speed, dependence on artificial experience and incapability of real-time monitoring due to long-time use of a helium mass spectrum detection method when leakage positioning detection is performed on a leakage source of vacuum equipment in the prior art are solved.

The invention relates to multi-range calibration for a single pin parameter measurement unit. A test equipment system may provide a signal to a device under test (DUT), or receive a signal from the device under test (DUT). The test system may include an output stage having an output buffer circuit, which may be controlled locally or externally. An external controller may be used to provide a precision input signal, and in response, to measure current at a DUT interface node of the system, or to measure voltage characteristics of different components within the system. Using the input signal from an external controller, one or more aspects of the test system may be calibrated. For example, a current signal received from an external controller may be used to calibrate the resistance of a sense resistor in the output stage. In another example, a signal from an external controller may be used to determine a buffer offset characteristic to control a local drive circuit of the system.

The invention discloses a test control method and system for a direct-current power supply, and relates to the field of simulation testing, and the method comprises the steps: constructing a three-dimensional adaptive model to complete the matching calibration of system software and hardware, and achieving the load calibration through the comparison of dynamic load simulation and actual measurement data; in the testing process, a three-stage starting mechanism is adopted to power on step by step, fault protection is configured, and parameter scanning and real-time recording are executed according to a preset mode and a testing point; a double-closed-loop feedback mechanism is introduced, an inner loop adjusts output parameters, and an outer loop predicts power grid disturbance and performs advanced compensation; a safety threshold value is dynamically generated in combination with real-time environment data, linkage protection of approaching early warning and overrun protection is achieved, and a reliable effective data set is formed through fusion processing and double verification of multi-source test data. The system has the advantages that the precision and intelligence of the whole test process are realized through dynamic load simulation, a multi-level safety protection system is constructed through a three-level starting mechanism, and the precision, safety and data value of the test are comprehensively improved.

The invention provides a turbine flow calculation method based on multiple signals, and belongs to the technical field of turbine flow calculation, and the method comprises the following steps: based on the fact that a measured fluid flows through a turbine flow meter, obtaining multiple signals of the measured fluid by utilizing the turbine flow meter, and calculating the multiple signals of the measured fluid to obtain the multiple signals of the measured fluid; the initial volume flow, temperature and pressure of the measured fluid are obtained; querying the physical property parameter table of the measured fluid, and calculating the density and viscosity of the measured fluid in combination with the temperature and pressure of the measured fluid; setting a calibration test bed and calibration flow, obtaining calibration viscosity, obtaining a correction coefficient through nonlinear fitting and calculation, and constructing a volume flow correction formula; the viscosity of the measured fluid and the initial volume flow rate are substituted into a volume flow rate correction formula, the corrected volume flow rate is obtained, and the mass flow rate of the measured fluid is obtained through calculation in combination with the density of the measured fluid; the problem that an existing turbine flowmeter does not have the density, viscosity and mass flow calculation capacity is solved.

The invention discloses a pressure sensor metering test fixture, and relates to the field of metering test, the metering test fixture is configured to be an automatic test fixture system used for realizing automatic feeding, clamping and multi-dimensional pressure test of a pressure sensor, and the automatic test fixture system comprises a fixing jig, a feeding mechanism, a grabbing manipulator and a test mechanism, the fixing jig is used for fixing a pressure sensor to be tested; the feeding mechanism is used for achieving jacking conveying of the fixing jig. The grabbing manipulator is used for grabbing the fixed jig from the jig bearing disc; the testing mechanism is used for executing automatic multi-step pressure calibration testing on the fixed to-be-tested pressure sensor; according to the measuring and testing clamp, the fixing jig, the feeding mechanism, the grabbing mechanical arm and the testing mechanism are integrated, integrated equipment integrating automatic feeding, precise clamping, multi-station testing and automatic circulation is constructed, and full-process automation and intellectualization of pressure sensor measuring and testing are achieved.

The invention relates to a measurement standard equipment operation state evaluation method and evaluation system based on verification and detection data, computer equipment and a storage medium, and solves the problems of easy deviation, low efficiency and the like in verification, calibration and testing of operation measurement standard equipment in the prior art. According to the technical scheme, related data of measurement standard equipment are obtained, and influence factors are mined; analyzing the influence factors, and constructing a running state evaluation model; comprehensively screening and constructing an evaluation system based on the operation state evaluation model; calculating a comprehensive score of the metering equipment; and performing clustering and grading evaluation. The method has the advantages that the operation state evaluation model is constructed and based on the operation state evaluation model, the data analysis technology and multiple algorithms are utilized, state evaluation influence factors are mined through historical detection data and full-period data, operation state comprehensive scoring is carried out on the measurement standard equipment, the real-time state of the equipment is evaluated, the service life is predicted, existing problems are found and checked in time, and the measurement standard equipment is evaluated. And the lean management level of standard metering equipment is improved.

The invention discloses a frequency mixer test method, and relates to the technical field of microwave radio frequency test, and the method comprises the following steps: S1, building a test platform; s2, calibrating the test platform; s3, testing indexes; and according to the received reflection signal and standing wave signal, port isolation test, frequency conversion loss test, port standing wave test and output 1dB compression point test are carried out on the mixer to be tested, and a test curve of each index is drawn after the test is completed. According to the method, all key indexes of the mixer can be tested at different power frequency points through one-time calibration, meanwhile, standing wave testing of the LO port under high power can be achieved, the testing efficiency and accuracy are greatly improved, and the technical problems that in the prior art, multiple times of calibration are needed in the testing process, and the testing efficiency is low are solved.

The invention discloses a hybrid temperature compensation method for a miniaturized laser inertial measurement unit, which comprises the following steps of: carrying out a table parameter evaluation calibration test, a laser inertial measurement unit full-parameter evaluation calibration test and a laser inertial measurement unit power-on test by taking a temperature of 0 DEG C as a power-on temperature; adjusting the power-on temperature, repeating the test, and acquiring multiple groups of test data at different power-on temperatures; dynamically fusing the obtained multiple groups of test data at different power-on temperatures to construct a dense temperature data set; based on the dense temperature data set, constructing a primary temperature compensation model, and performing iterative optimization on the primary temperature compensation model to obtain a final optimal temperature compensation model; and completing hybrid temperature compensation of the laser inertial measurement unit according to the optimal temperature compensation model. The method provided by the invention solves the problem of inaccurate temperature compensation model caused by fast temperature rise of the miniaturized laser inertial measurement unit.

The present invention relates to the technical field of flexible sensors, and in particular to a calibration test platform for resistive flexible tactile sensors, which not only meets test requirements but also increases protection for easy loading and unloading and improves reliability. The platform comprises a platform plate, legs, a resistive flexible tactile sensor placement frame, hinges, a cover frame, a connecting frame, a spring, a guide rod, a guide tube, a movable top plate and a fixed top plate. The four corner sides of the bottom end of the platform plate are respectively connected to the top ends of a group of legs, the outer side of the top end of the platform plate is connected to the bottom end of the resistive flexible tactile sensor placement frame, the rear side of the top end of the resistive flexible tactile sensor placement frame is connected to the rear lower end of the cover frame via a hinge, the bottom ends of two groups of guide tubes on the left and right sides are respectively connected to the front and rear sides of the top end of a group of movable top plates, and the spring is sleeved on the guide rod and the guide tube, the two ends of the spring are respectively connected to the connecting frame and the movable top plate, the left and right ends of the lower inner side of the cover frame are respectively connected to a group of fixed top plates, and a thin rubber layer is sandwiched between the two groups of movable top plates and the fixed top plates.

A device (1) having a DA conversion circuit is provided with at least: a processor (10P) that outputs a DA conversion target value; a pre-stage circuit (10FNT) that receives the DA conversion target value from the processor (10P), corrects the DA conversion target value in accordance with the correction data, and outputs the corrected DA conversion target value; a main body circuit (10BDY) that includes one or more DA converter elements to be corrected and that performs DA conversion on the corrected DA conversion value; and an AD converter (10AD). Here, the DA converter element to be corrected is a hybrid DA converter element that outputs, from an output terminal, an analog value obtained by adding an analog value output by a first-type circuit section (SEG1) responsible for an upper level and an analog value output by a second-type circuit section (SEG2) responsible for a lower level. Furthermore, as a calibration test for creating or updating calibration data, the processor (10P): A) acquires a plurality of test pairs, each of which is a pair of a test input value and a test result value having the following characteristics: (A1) the test input value is a value input to the main circuit in a corrected or uncorrected manner as a value to be subjected to DA conversion, and (A2) the test result value is a value input to the main circuit in a corrected or uncorrected manner as a value to be subjected to DA conversion; (A2) The test result value is a value obtained by AD-converting an analog value output by inputting the test input value to the main body circuit by means of an AD converter, and (B) the correction data is updated on the basis of the plurality of test pairs in (A). Here, the number of test pairs acquired during the calibration test is less than N power of 2, N being the number of bits indicating the resolution of the DA converter element to be calibrated.

The utility model relates to the field of test equipment, and discloses an impact testing machine, which comprises a frame body, a data reading assembly, a pendulum bob assembly, a limiting assembly and an alignment piece, a limiting groove is arranged in the limiting assembly along a first direction, a limiting step is formed in the limiting assembly along a second direction, and a test piece is arranged on the limiting step along the second direction. One side of the test piece abuts against the limiting step, and the test piece stretches across the limiting groove; the alignment piece is movably connected with the limiting assembly to form an alignment state and an impact state of the alignment piece; in the alignment state, the limiting assembly is located outside the limiting groove, the alignment piece is arranged above the limiting assembly in the second direction, the alignment piece stretches across the limiting groove, and the alignment piece is used for calibrating the position of the test piece; in the impact state, the alignment piece is arranged on one side of the limiting groove, and it is avoided that swinging of the pendulum bob assembly in the limiting groove is affected. According to the impact testing machine, the alignment piece is movably connected with the limiting assembly, and the alignment piece does not affect an impact test.

The utility model discloses a calibration test fixing device for an atmosphere data computer, which is characterized in that two sides of an upper cover plate and a lower cover plate are respectively supported by a right side plate and a left side plate to form a frame structure, at least three groups of slots are symmetrically arranged on opposite surfaces of the right side plate and the left side plate, the slots are horizontally arranged, and one end of each slot is provided with an opening for inserting a support plate; one end of each slot is open, the other end of each slot is sealed, a supporting plate is selectively inserted into each pair of slots, the supporting plates are used for placing an atmosphere data computer, and the atmosphere data computer is connected with external equipment through a test cable. The device can effectively and absolutely safely lock equipment, has enough bearing and protecting capabilities, is matched with a guide rail structure, locks a hardware plate, stably locks the equipment in a test fixing device, supports multi-equipment access test calibration, greatly saves equipment calibration test cost, reduces calibration time, and improves test efficiency. And the space utilization in the testing process can be increased.

The invention belongs to the technical field of new energy, and discloses a new energy station frequency modulation system dynamic performance and continuous step response test method, which comprises the following specific steps: S1, connection and calibration of a test system; s2, testing signal parameter configuration; s3, executing a dynamic performance test; s4, a continuous step response special test is carried out; s5, data and video conjoint analysis; s6, quantitatively evaluating a test result; s7, performing off-line reproduction of the fault scene; s8, maintaining and verifying the testing device; and S9, generating and filing a test report. According to the invention, through high-precision calibration and multi-mode signal configuration, the accuracy and reliability of test data are ensured; a dual-channel synchronous acquisition and dynamic compensation algorithm is adopted, the response characteristics of the system are accurately captured, and the measurement precision in a small frequency deviation scene is improved; and in combination with video conjoint analysis and quantitative evaluation, the adjustment performance and the anti-interference capability are deeply revealed, and a complete dynamic performance evaluation closed loop is formed.

The invention belongs to the field of automobile testing, and relates to a calibration method for automobile winter heating by using an environmental wind tunnel, which comprises the following steps: S1, collecting an original dynamic road spectrum, and processing to generate a standard dynamic road spectrum for low-temperature calibration of the environmental wind tunnel; s2, operating the environment wind tunnel based on the standard dynamic road spectrum, acquiring an actual environment control value of the environment wind tunnel in real time, and judging whether the environment wind tunnel meets the winter heating calibration requirement or not according to a preset inspection rule; s3, an air conditioner heating system calibration test is executed in the environment wind tunnel according to a preset winter steady-state working condition matrix, and an initial heating control parameter table is generated; and S4, on the basis of test data corresponding to the initial heating control parameter table, constructing a system dynamic model, optimizing a strategy network in the system dynamic model through imitation learning and course reinforcement learning, and generating a complete heating control parameter table through optimized strategy distillation. The problems of poor comparability and repeatability of calibration data and insufficient calibration precision are solved.

The invention discloses a device for rapidly replacing a flaw detection calibration test block, and relates to the technical field of flaw detection calibration, the device comprises a calibration platform and a test block body, and also comprises: a bearing assembly arranged on the calibration platform; the adjusting assembly is arranged on the calibration platform and is used for adjusting the test block bodies with different sizes; the driving assembly is arranged on the calibration platform; the transmission assembly is arranged on the calibration platform and used for transmitting the power of the driving assembly to the adjusting assembly; the lubricating assembly is arranged on the calibration platform and used for lubricating the adjusting assembly; through the arrangement of the bearing assembly, the mold fixed on the iron plate is fixed by utilizing the control of the existence of the magnetic field of the electromagnet, and through the various molds capable of placing the test block bodies with special shapes, the test block bodies with different shapes can be effectively placed on the bearing table on the basis of placing the test block bodies with different thicknesses; the types of replaceable test block bodies of the device are expanded, and the application range of the device is expanded.

The invention provides a method and a device for calibrating light output power of a laser of an optical module, the optical module and a medium, and relates to the technical field of optical communication. Multiple times of calibration tests are carried out in a calibration test stage, a laser is turned on in each test, a group of output current data and light emitting power data are acquired, and finally a crosstalk calibration coefficient is calculated according to the acquired multiple groups of output current data and multiple groups of light emitting power data. And in the working stage of the optical module, all the lasers are turned on, and the actual light emitting power of each laser is calculated according to the crosstalk calibration coefficient and the actual output current of each backlight detector. The method effectively simulates the temperature and multi-channel concurrent environment when the optical module actually works, so that the calculated crosstalk calibration coefficient can more accurately reflect the crosstalk condition under the real working condition, and the monitoring accuracy of the light emitting power of the laser is remarkably improved; meanwhile, additional hardware such as a light filter plate does not need to be added, the production cost is reduced, and high-precision and low-cost crosstalk calibration is achieved.

The embodiment of the utility model provides a pallet fork anti-collision part calibration test bed. The pallet fork anti-collision part calibration test bed comprises a base, a sliding seat, a collision assembly and a driving assembly. Wherein the sliding seat is arranged on the base in a matched mode, the sliding seat moves along the base, the pallet fork anti-collision component is fixed to the sliding seat, and the pallet fork anti-collision component moves along the base along with the sliding seat. The collision assembly is arranged on the base; the driving assembly is connected with the sliding seat, and the driving assembly drives the sliding seat to move in the length direction of the base, so that the fork anti-collision part is in collision contact with the collision assembly, the situation that the fork anti-collision part collides with a goods shelf or a tray is simulated, and whether the fork anti-collision part can work normally or not is tested.

The invention belongs to the technical field of hovercars, and particularly relates to a duct and propeller tension test board calibration device which comprises a base 1, a weight set 2, a weight frame 3, a lifting rod 4, an inclinometer 5, a pulley block, an adapter flange 8 and a platform 9. Compared with the prior art, the duct and propeller tension test board calibration device provided by the invention has the advantages that the height adjustment of the calibration device is realized through the four lifting rods, so that the calibration device is suitable for to-be-calibrated test boards with different heights; pulling force is provided through combination of a pulley block and a weight, the weight loading principle is simple, the force value is directly traced back to the mass standard, large-range and high-precision pulling force calibration is achieved, force transmission angle adjustment is achieved, lag and creep errors are avoided, repeatability is good, static point loading is achieved, and it can be guaranteed that the applied force accurately passes through a duct or a propeller axis; meanwhile, a universal flange interface is used, the connection structure is simplified, the connection with power output flanges of different to-be-calibrated test benches is ensured, and the universality of the calibration device is improved.

A non-feedback variable stiffness transmission mechanism moving target correction method specifically comprises the steps of mechanism semi-physical simulation model establishment, equivalent pre-tightening force measurement and calculation and mechanism target position correction based on equivalent pre-tightening force, and belongs to the technical field of mechanical transmission, and the method comprises the steps that a variable stiffness transmission mechanism semi-physical control model is established; establishing a variable-stiffness transmission mechanism pretightening force calibration system, and performing a variable-stiffness transmission mechanism pretightening force calibration test to obtain variable-stiffness transmission mechanism pretightening force calibration test data; analyzing the pre-tightening force calibration test data of the variable stiffness transmission mechanism to obtain equivalent pre-tightening forces in different pre-tightening states; and correcting the moving target of the variable-stiffness transmission mechanism by using the equivalent pre-tightening force in the different pre-tightening states. The problems that the tension detection difficulty of the flexible cable transmission mechanism in the limited narrow space is large, and the motion control accuracy is not enough due to no feedback are solved.

The present disclosure teaches a testing device for fuel injectors. The testing device provides a manual mode and an automatic mode of testing fuel injectors. Wherein, the manual mode is implemented using graduated cylinders, enabling a user to visually perceive the measurement. The graduated cylinders can also be used to calibrate the testing device. Wherein, the automatic mode is implemented using flow sensors, or flow meters. Two flow meters with different ranges of measurement are respectively used to measure the maximum fuel delivery rate and the minimum fuel delivery rate of the tested fuel injectors. The start time of energizing the fuel injectors may be marked as t1. The time when a flow meter detects a flow through the flow meter may be marked as t2. The time-offset, or latency time of the tested fuel injectors may be calculated as To=t2−t1.

The utility model belongs to the field of sensor calibration, particularly relates to a meteorological rainfall sensor calibration device, and aims to solve the problem that the efficiency and accuracy of calibration test are reduced due to the fact that rainfall sensors of different models and sizes cannot be stably clamped and quickly mounted and dismounted by an existing device. The top of the water tank fixedly communicates with a barrel, an opening is formed in one side of the barrel, guide frames are fixedly arranged on the two sides of the inner wall, located at the opening, of the barrel, and the same fixing frame is slidably arranged on the sides, close to each other, of the two guide frames; and the clamping assembly is arranged on the fixing frame and is used for clamping the rainfall sensor. According to the utility model, through the arrangement of the clamping assembly, stable clamping and rapid mounting and dismounting of the rainfall sensor are realized, the efficiency and accuracy of calibration testing are improved, the device can adapt to rainfall sensors of different models and sizes, and the practicability and flexibility of the device are enhanced.

This invention discloses an active coupling cavity device and calibration method for calibrating a standard microphone. A sound source adapter is located at the signal input end of the active coupling cavity. A multi-channel sound field distribution structure is located within the active coupling cavity, comprising eight acoustic channels evenly distributed circumferentially along the central axis of the active coupling cavity. A symmetrical clamping assembly constrains the reference microphone and the microphone under test to be symmetrical about the central axis of the active coupling cavity. A coaxiality test ring assembly rigidly constrains the axes of the reference microphone and the microphone under test to coincide with the central axis of the active coupling cavity. The calibration test system includes a signal generator, a sound level meter under test, a preamplifier, a measurement amplifier, a bandpass filter, and a digital voltmeter. The multi-channel uniformly distributed sound field structure solves the problem of uneven sound pressure distribution caused by unidirectional input, and the symmetrical clamping assembly and the coaxiality test ring assembly respectively solve the problem of poor consistency in low-frequency and high-frequency phase measurements.