【作者】 李庆丰；

【导师】 徐鹏； 范锦彪；

【作者基本信息】 中北大学 ， 测试计量技术及仪器， 2008， 硕士

【摘要】 本文针对高g值加速度计激光干涉冲击校准问题,主要进行了以下两方面的研究:一、加速度计校准对激励脉冲宽度的要求以及脉冲宽度的调整。二、多普勒信号解算算法的研究。本文目的是研究加速度计冲击校准对激励脉冲宽度的要求、利用不同几何尺寸的霍普金森杆和不同激励方式获得脉宽符合要求的激励脉冲;研究激光干涉仪输出多普勒信号的整形及其解算。在广泛检索国内外相关文献的基础上,作者采用理论分析、计算机模拟、实验室实验相结合的方法,对上述问题进行了研究:(1)通过加速度计数学模型从理论上分析了对加速度计准静态校准和动态校准时激励脉冲宽度应分别满足的要求,并给出了脉冲宽度、加速度计谐振频率和校正误差之间的关系。为获得满足要求的脉冲宽度,设计了三种霍普金森杆冲击装置,所产生的脉宽范围从6.62微秒至210微秒。(2)提出了对多普勒信号整形的新方法,有效消除了实测多普勒信号中零线漂移和幅值减小的现象。多普勒信号瞬时频率的解算采用对瞬时相位微分的方法。文中利用模拟多普勒信号对多普勒解算算法进行了验证,说明算法具有较高的精度。采用本文论述的方法,对兵器工业二O四所研制的压电型988加速度计进行了准静态校准实验,取得了满意的结果。说明本实验装置和所采用方法的正确性。更多还原

【Abstract】 In this thesis, the following two aspects of researches are performed about the shock calibration with laser-interferometry for high g accelerometers:First, the criteria about the duration of input acceleration pulses in the accelerometer calibration, and the adjusting of the pulse duration; Second, the study on the arithmetic about decoding the Doppler signals.The aims of this thesis are to establish the criteria about the duration of input acceleration pulses in the accelerometer calibration, to generate the input pulses with ideal durations by changing the dimensions of the Hopkinson bar, and to investigate on modification and decoding the Doppler signals from the interferometer. Having been searched abroad the related documents, the methods such as theoretical analysis、computer simulation、laboratory test are adopted to investigate the issues in question:(1)The criteria about the durations of the input acceleration pulse for the qusia-static and dynamic calibrations are established theoretically from the mathematic model of the accelerometer. And the relations of the duration of the pulses, the resonance frequency and the error of the calibration are presented. Three kinds of Hopkinson bar shock devices have been applied to generate pulses with ideal durations. The available durations of the pulses range from 6.62μs to 210μs.(2)A new method to modify the Doppler signal is applied, with which the phenomena of the zero-line shift and the decrease in amplitude are eliminated. The instantaneous frequency of the Doppler signal can be obtained by derivative of the instantaneous phase of the Doppler signal. The arithmetic about decoding the Doppler signals is proved to possess high accuracy by the artificial Doppler signal.A kind of piezoelectric-type accelerometer 988 developed by 204 institute of the ministry of the weapon industry have been evaluated in the quasi-static calibration with the presented method. And the result of the calibrations entitled this calibration device and the method with validity.更多还原