Abstract
To solve the problem of resonance during quasi-static calibration of high-g accelerometers, we deduce the relationship between the minimum excitation pulse width and the resonant frequency of the calibrated accelerometer according to the second-order mathematical model of the accelerometer, and improve the quasi-static calibration theory. We establish a quasi-static calibration testing system, which uses a gas gun to generate high-g acceleration signals, and apply a laser interferometer to reproduce the impact acceleration. These signals are used to drive the calibrated accelerometer. By comparing the excitation acceleration signal and the output responses of the calibrated accelerometer to the excitation signals, the impact sensitivity of the calibrated accelerometer is obtained. As indicated by the calibration test results, this calibration system produces excitation acceleration signals with a pulse width of less than 1000 μs, and realize the quasi-static calibration of high-g accelerometers with a resonant frequency above 20 kHz when the calibration error was 3%.
Highlights
High-g accelerometers are designed to measure impact acceleration when launching a projectile body from the barrel of a gun, penetrating a target, etc
When the pulse width of the excitation signal is greater than the minimum width determined When the pulse width of the excitation signal is greater than the minimum width determined by by Equation (12), the calibration error of the accelerometer is less than 3%
By exploring the problem that impact sensitivity cannot be obtained accurately due to resonance resonance during the quasi-static calibration of high-g accelerometers, this study contributed the during the quasi-static calibration of high-g accelerometers, this study contributed the following: following: (1) A second-order mathematical model is used to describe the response characteristics of the high-g
Summary
High-g accelerometers are designed to measure impact acceleration when launching a projectile body from the barrel of a gun, penetrating a target, etc. The impact sensitivity and uncertainty of the calibrated accelerometer are obtained through the quasi-static calibration test to guarantee accuracy of the high-impact test data. Within the range of 105 g (the peak value of impact acceleration) and 200 μs (the pulse duration), the absolute calibration of the impact sensitivity of a high-g accelerometer is achieved with. Impact sensitivity is related to the features of excitation signals, such as peak value, pulse duration, frequency high-gcalibration accelerometer, present improve accelerometer the quasi-static calibration etc.of. Bybecome comparing the responses excitation resonance of the high-g accelerometer, the quasi-static calibration method for high-g accelerometers acceleration signals and the calibrated accelerometer to the excitation signals, we obtain the impact should be improved. By studying the relationship between the pulse width of the excitation signal and the resonant frequency of the high-g accelerometer, the present study improve the quasi-static calibration theory
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