A method for measuring the peak value of shock waveform based on parameter fitting

Abstract

The invention relates to a shock waveform peak value measurement method based on parameter fitting, and belongs to the fields of vibration shock and mechanical engineering and the technical field of metrology testing. The method comprises the following specific steps: generating shock excitation by using a shock excitation source, and performing waveform measurement by using a sensor and a matched waveform data acquisition system to obtain a complete shock measurement waveform uniformly-spaced sampling sequence; acquiring the maximum value and the minimum value of a shock waveform by using a comparison method; intercepting an approximate half-sine part waveform close to a peak value between the maximum value and the minimum value from the shock measurement waveform uniformly-spaced sampling sequence for use in peak value calculation; performing a four-parameter fitting process of a shock waveform peak value by using a sine wave fitting method; iteratively calculating a shock measurement waveform peak value by using a fitting sine wave amplitude value and a direct-current component; and giving a fitting residue effective value serving as an assistant criterion for judging the performance of peak value fitting. The shock waveform peak value measurement method has the calculation effects of omission of a peak value filter, higher accuracy and higher resolution.

Description

technical field [0001] The invention belongs to the fields of vibration and shock, mechanical engineering and measurement and testing technology, and relates to a method for measuring the peak value of a shock waveform, in particular to a method for measuring the peak value of a shock wave due to mechanical shock, electrical shock, gas shock, liquid shock, sound shock, light shock, explosion, etc. Peak measurement method for shock waveforms. Background technique [0002] The shock waveform belongs to the pulse wave, and the calculation and determination of the pulse peak value are the basic problems in the pulse measurement. Shock measurement is in many cases related to safety and damage performance of weaponry etc. For example, when the spacecraft lands and recovers, people will measure the maximum acceleration when it lands, so as to evaluate and determine whether it exceeds the tolerance limit of the human body and equipment, and then take protective technical measures; ...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect that the ISO recommended method requires pre-filtering, thereby affecting the measurement accuracy, and the IEC recommended method is not completely suitable for half-sine and Gaussian shape shock waveforms, so as to improve the half-sine shape and Gaussian shape. For the purpose of measuring and calculating the accuracy of the peak value of the shock waveform, a method for measuring the peak value of the shock waveform based on parameter fitting is proposed

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