Dynamic Calibration Device Research Articles

Dynamic Simulation of Moving Element for Dynamic Calibration Device of Eddy Current Sensor Based on ANSYS

In order to ensure that the moving element of dynamic calibration of the eddy current sensor does not resonate and the unevenness of vibration does not affect the accuracy of calibration, modal analysis and harmonic response analysis was performed within the frequency range of the dynamic calibration device of the eddy current sensor. The results show that the first order modal frequency of the moving element is 3406 Hz, which is 5 times greater than the maximum calibration frequency. The vibration unevenness of the induction plate at maximum working frequency is 0.73%, which does not enough to significantly influence on the calibration accuracy. Therefore, the design of the moving element of dynamic calibration device for the eddy current sensor meets the requirements of operation.

Design of Control System for Dynamic Calibration Device of Eddy Current Sensor Based on FPGA

In the dissertation, an automatic and integrated calibration device for the static characteristics of eddy current sensors was researched aimed at the great demand of improving the efficiency of calibrating eddy current sensors. The design proposal for the control system in the slave computer of automatic and integrated calibration device for the dynamic characteristics of eddy current sensors was studied. The control method of vibration level automatic adjustment was proposed. A signal generator, a data acquisition unit and a data storage unit were designed. Besides, the serial communication module was also designed to communicate with the master computer.

Magnetic suspension dynamic calibration device of measurement system for dynamic characteristics of sliding bearings.

A measurement system error is a key factor that disturbs the identification precision of sliding bearing's dynamic characteristic coefficients. The transfer process and influence rule of errors from a measurement system to dynamic characteristic coefficients are analyzed by solving the dynamic characteristic measurement model. In order to ensure that the identification errors are no more than 40%, the amplitude error and phase error of the transfer function of the measurement system should be controlled within 10% and 1°, respectively. A novel magnetic suspension calibration method of the measurement system, which generates a vibration through a noncontact electromagnetic force rather than a traditional contact force, is proposed. A magnetic dynamic calibration device is developed. The experiment results show that the device can make dynamic calibration at different frequencies successfully, which is favorable to improve the controllability of the calibration process and the stability of calibration results.

Research on Characteristic Parameter of Ta-Zro2 Fiber Blackbody Cavity Temperature Sensor

By sputtering and plasma spraying technology, a sapphire optical fiber blackbody cavity temperature sensor of tantalum (melting point is 2997℃) - zirconium oxide (melting point is 2715℃) thin film was developed. Static calibration system for the sensor to measure target temperature 1721 ℃ is also designed by using three oxygen (produced by water electrolysis) flame guns. When its impact resistant capacity is more than 50MPa, the corresponding temperature is 2802 ℃ . A high power and high frequency modulation CO2 laser pulse is used as exciting source to heat it to 1500℃, and the dynamic calibration device is designed independently, thus this sensor in experimental results show a time response on the order of μs. Signal collection and transmission through fiber optic cable are proposed, which can meet the need of transient high temperature measurement in harsh environment.

Embedded Transient Shock Signal Storage Test Technique under High Overload

To avoid the interference causing by testing cables of acceleration sensors and acquire the dynamic impact load acceleration data conveniently and reliably in the environmental test as the penetrating or drop test, the embedded transient shock signal measurement system is designed adopting the storage measurement technique integrating the accelerometer, signal conditioning circuits, data sampling and storage circuit, communication interface circuit, and a power source. It is of small size, low power consumption, capable of working under high impact acceleration and good engineering practicability validated by a drop test. Based on fully integrated mixed-signal system-on-chip MCU C8051F340 with full speed USB flash, the system has 100 KHz sampling frequency, 5 second sampling length, 100000g measuring range, which can resist at least high overload of 60000g through the static and dynamic calibration device. In this paper, the operation principle, the circuits of central modules, the Labview software design interface, the static and dynamic encapsulating technology and calibration method are simply introduced. The design has some referenced value for me.

Design of Linear Damper in Calibration Device for Dynamic Force

The force transducer for dynamic calibration in absorber dynamometer is usually statically calibrated. To solve the problem, a new kind of dynamic calibration device and its working principle is discussed. Furthermore , the principle of its core member, linear damper, is particularly analyzed. Moreover dampers in different structures are discussed in depth and the production of its damping force is deduced. Thus, the theoretical premise of dynamic calibration device and linear damper is provided in this essay.

Structural Strength Analysis of Special Dynamic Calibration Equipment for Artillery Chamber Pressure Testing System

The dynamic calibration of artillery chamber pressure testing system under simulating application environment is an important means to ensure the measurement accuracy. Dynamic calibration device can simulate the testing environment with high temperature and high pressure in the artillery chamber. The main body of the calibration device is the key part to withstand instant high temperature and high pressure. In the paper, the structure strength of the main boy of the calibration device is theoretically analyzed and systematically calculated, and the stress of it is calculated by the finite element software. Simulation and analytical results indicate that the main boy of the device can withstand pressure of up to 8000bar. Finally, it is verified by the experiment and the results that the structural strength is accord with the design.

Accurate roughness measurements by dynamic calibration, VFM-uncertainty calculations and a special calibration specimen

The uncertainty of roughness measurements and calibration is usually rather high. This paper gives some methods to estimate the uncertainty properly and proposes a dynamic calibration device and a special reference specimen to enable more accurate roughness measurements.