The invention discloses an impact monitoring and positioning method based on a two-dimensional beam focusing theory. The method specifically comprises the following steps: 1, monitoring a signal whena structure is impacted by adopting a piezoelectric sensor; sending the acquired impact signal to an upper computer by using a data acquisition card, performing Fourier transform on the impact signalin the upper computer to obtain a signal spectrogram, selecting a frequency peak value of the spectrogram as a center frequency to perform wavelet analysis on the signal to obtain a time domain signalcorresponding to the center frequency, and enveloping the obtained time domain signal; 2, solving the position of an impact point by using a two-dimensional beam focusing positioning method, and judging whether the impact point is in an external field or not; and 3, if the positioning coordinates are not in the external field, considering that the positioning result is located in a blind area ofthe internal field two-dimensional beam focusing positioning method, solving the positioning coordinates (a, b) again, and outputting the positioning coordinates as a final positioning result. According to the invention, the problems of positioning dead zones and low positioning precision of the existing one-dimensional beam focusing positioning are solved.
本发明公开了一种基于二维波束聚焦理论的冲击监测定位方法,具体包括如下步骤:步骤1,采用压电传感器对结构发生冲击时的信号进行监测,利用数据采集卡将采集得到的冲击信号发送给上位机,在上位机中对冲击信号进行傅里叶变换得到信号频谱图,选取频谱图的频率峰值作为中心频率对信号进行小波分析,得到中心频率对应的时域信号,对所得时域信号包络线;步骤2,利用二维波束聚焦定位方法求出冲击点所在位置,判断是否在外场;步骤3,若定位坐标不在外场,则认为该定位结果位于内场二维波束聚焦定位方法的盲区,重新求取定位坐标(a,b),作为最终定位结果输出。本发明解决了现有一维波束聚焦定位存在的定位盲区以及定位精度较为低的问题。
Impact monitoring and positioning method based on two-dimensional beam focusing theory
一种基于二维波束聚焦理论的冲击监测定位方法
2020-04-17
Patent
Elektronische Ressource
Chinesisch
IPC: | G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT / G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen |
British Library Conference Proceedings | 1998
|Diffractive Focusing of a Gaussian Beam
British Library Online Contents | 2002
|Focusing properties of spirally polarized hollow Gaussian beam
British Library Online Contents | 2011
|