Application of Ultrasonic Testing for Detecting Defects on Wooden Rafters in Ancient Building
Introduction Ultrasonic test methodology and analyzing process were studied for the purpose of detecting defects in rafter members of ancient wooden building. Normally, rarer members are buried or attached with the ceiling of the roof and this aspect makes it hard to apply the normal transmission method. Moreover, deterioration of this member normally starts and/or progresses at the attached or buried parts. For solving these problems, in this study, indirect test methodology of ultrasonic test was proposed and analyzing methods including time and frequency domain analysis were also proposed. Normal TOF (Time of Flight) analysis found out to be difficult to derive reliable results while the frequency domain analysis with FFT (Fast Fourier Transform) and BPF (Band Pass Filter) showed high possibility of detecting defects. Energy analysis of received ultrasonic signal is now on process with additional devices.
S.J.Lee H.Yeo K.B.Kim J.J.Lee
Seoul National Univ./Department of Forest Sciences,151-921, R.M.6218, Bldng.200, Gwanaknro 599, Gwanak-gu, Seoul, Korea
国际会议
International Symposium on Wood Science and Technology(IAWPS 2008)(国际木材产品学会联合会2008学术研讨会)
哈尔滨
英文
67-68
2008-09-27（万方平台首次上网日期，不代表论文的发表时间）