Shock waveform peak measurement method based on quadratic curve fitting

Abstract

The invention relates to a shock waveform peak measurement method based on quadratic curve fitting and belongs to the field of vibration shock and mechanical engineering and the technical field of metering testing. The shock waveform peak measurement method based on quadratic curve fitting comprises the particular steps that a shock excitation source is used for generating shock excitation, a sensor and a matched waveform data collection system are used for carrying out waveform measurement, and a complete shock measurement waveform uniformly-spaced sampling sequence is obtained; the maximum value and the minimum value of the shock waveform are obtained through a comparison method; a full-convex or full-concave waveform, close to the peak, between the maximum value and the minimum value is cut out in the shock measurement waveform uniformly-spaced sampling sequence and used for peak calculation; the three-parameter fitting process of the shock waveform peak is carried out through a parabola fitting method; the shock measurement waveform peak and the position where the shock measurement waveform peak occurs are calculated through the fitting peak; a fitting residual valid value is given out as an auxiliary criterion of the advantage and disadvantage of peak fitting. The shock waveform peak measurement method based on quadratic curve fitting has the calculation advantages that a peak filter is not needed, the peak and the position where the peak occurs are given out, and the accuracy and the resolving ability are higher.

Description

technical field [0001] The invention belongs to the field 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 shock wave formed by mechanical collision, electrical shock, gas shock, liquid shock, sound shock, light shock, explosion, etc. Shaped peak measurement method. 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; kinetic energy weapons such as bullets, shells, ...

AI Technical Summary

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 quadratic curve fitting is proposed

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