公开(公告)号：KR101414520B1

公开(公告)日：2014-07-04

申请号：KR1020130048072

申请日：2013-04-30

Applicant: 한국과학기술원

Inventor： 손훈 ,  임형진 ,  양수영 ,  페이페이리우

IPC: G01B17/04 ,  G01N29/14

CPC classification number: G01N29/46 ,  G01B17/04 ,  G01M5/0033 ,  G01M5/0066 ,  G01N29/045 ,  G01N29/0654 ,  G01N29/2437 ,  G01N29/28 ,  G01N29/348 ,  G01N2291/01 ,  G01N2291/023 ,  G01N2291/02475 ,  G01N2291/02491 ,  G01N2291/0258 ,  G01N2291/0289 ,  G01N2291/106

Abstract: The present invention relates to a safety inspection method for a structure using a nonlinear ultrasonic modulation method. The safety inspection method comprises a step of vibrating a structure by applying both signals with each different frequency to the structure; a step of converting the response of the structure generated by the vibration to digital signals; a step of extracting primary modulation signals by removing and synchronous-demodulating the harmonic and linear responses of the frequency signals from the digital signals; a step of generating a first sideband spectrogram by extracting the primary modulation signals by continuously changing the frequency of the signals with each different frequency and coupling the primary modulation signals; and a step of discriminating whether or not the structure has cracks from the first sideband spectrogram. The present invention can precisely discriminate the existence of damage even if having the lower voltage level of ultrasonic waves than the existing technology; thereby reducing the power consumption of a sensor.

Abstract translation: 本发明涉及一种使用非线性超声波调制方法的结构的安全检查方法。 安全检查方法包括通过对结构施加每个不同频率的两个信号来振动结构的步骤; 将由振动产生的结构的响应转换为数字信号的步骤; 通过去除和同步解调来自数字信号的频率信号的谐波和线性响应来提取一次调制信号的步骤; 通过连续地改变每个不同频率的信号的频率并耦合一次调制信号，提取一次调制信号来产生第一边带谱图的步骤; 以及鉴别该结构是否具有来自第一边带频谱图的裂纹的步骤。 即使具有比现有技术更低的超声波电压水平，本发明可以精确地区分损伤的存在; 从而降低了传感器的功耗。