木构件局部敲击信号的时域分析与研究

Time Domain Analysis and Research On Local Coin-tap Signals of Wood Members

基于现代局部敲击法原理,模仿古建筑木构件采用脉冲锤、信号放大器等设备对有缺陷的圆形截面木柱及矩形截面板材进行了局部敲击试验,对采集的信号进行时域分析,计算参量敲击冲击时间τ,结果发现:在相同敲击力情况下,缺陷区域的敲击冲击时间明显大于良好区域的敲击冲击时间,且敲击冲击时间与缺陷大小具有良好的相关性,相关性达到0. 9以上。

Based on the principle of modern local coin-tap principle,this paper uses a pulse hammer,signal amplifier and other equipment to perform coin-tap tests on the wooden components of imitated ancient buildings that have defective circular cross-section wood columns and rectangular cross-section plates,with collected signals going through time domain analysis and parameter coin-tap impact duration time τ calculated,with the result showing that the same tapping force used,the coin-tap impact duration time in the defect area was significantly larger than that in a good area,with the coin-tap impact time showing good correlation with the defect size,and the correlation reaching over 0. 9.