Development of high temperature drying system supported by AE for boxed heart heavy timber without check

在木材干燥中，表面检测的传感技术尚未建立。虽然对声发射方法在木材干燥中的应用进行了实验尝试，但由于声发射波在木材中的衰减显著，因此在重型木材中的研究例中并没有特别包括测试例。在本研究中，在假设能够通过钉击破坏确定第一个检测位置的情况下，尝试了声发射监测检测的证明。将箱心方木的平纹中心钉住，在干燥过程中测量钉的声发射。在蒸汽过程中，无论是否检查，都会产生声发射。但人们认为，表面检查是可以监测的，因为表面检查是在干燥后短时间内看到声发射产生增加的情况下引起的。在板心方木内部检测中，由于板心方木中常产生像髓对角线一样的特征，在距板面边缘3cm处深钉，测量了钉的声发射。在蒸汽过程中，虽然没有产生内部校核，但也可以识别声发射和测量表面校核。在进行内部检查的情况下，从蒸后一天开始，声发射产生的增加相对较长。也就是说，内部检查不会在短时间内一次发生，而是从干燥中期开始，在较长的时间内相对渐进地进行。

In wood drying, the sensing technology of the surface checks has not been established. Though the use of the AE method is experimentally tried in the wood drying, the research example in the heavy timbers does not especially include the testing example because the attenuation of the AE wave in wood is remarkable.In this research, proof of monitoring checks by AE was tried under assumption that the first check position was able to be specified by damaging by nailing. The center of the flat grain of the boxed-heart square timber was nailed, and AE of the nail was measured during drying. AE was generated regardless of the checks during steaming. But it was thought that the surface checks were able to be monitored because the surface checks were caused in the one that an increase in the AE generation for a short time was seen during drying afterwards.In monitoring internal checks of the boxed-heart square timber, the nail deeply drove at the position of 3cm from the edge of face and AE of the nail was measured because there was a feature had often generated like the diagonal from pith. AE was recognized as well as the measurement of the surface check during steaming though no internal check was generated. In the condition that internal checks occurred, increases in the AE generation were comparatively seen for a long term since a day after steaming. That is, it was guessed that internal checks would not occur in a short time at a time but progress little by little comparatively for a long time since middle term of drying.