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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >WOOD TESTING USING ACOUSTO-ULTRASONIC
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WOOD TESTING USING ACOUSTO-ULTRASONIC

机译：用声波超声进行木材测试

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摘要

The ultrasonic-based methods applied to wood have been quite intensively developed during the last decade. Basically, both the stress wave propagation and the natural frequency vibration methods have been used for timber grading. In order to increase the sensitivity of the stress wave method, the acousto-ultrasonics, AUS, have been approached in the way to complete the initial time information. By joining time and spectral AUS data, exploratory researches have been supported as NDT of wood. Tests have been made with transducers working in frequency range of 25 kHz. Coupling problems have been partially solved using conical penetrating transducers. An acquisition station was set up, connected to an oscilloscope, amplifiers and software able to compute the AUS spectral characteristics. The maximum voltage picks, the signal energy and the decrement function were selected NDE variables. Applied to a sample of structural timber (solid wood), several AUS variables appear to be correlated to timber strength. Mechanical tests have confirmed the correlations. AUS variables added to the stress wave information give an increase of about 25% of the mechanical NDE of timber strength. This result is very interesting in terms of grading and reliability. The next step is to define a standard industrial acquisition method and to calibrate an applied exploitation model.
机译：在过去的十年中，已经广泛地开发了应用于木材的基于超声波的方法。基本上，应力波传播和固有频率振动方法都已用于木材分级。为了提高应力波方法的灵敏度，已采用声波超声AUS来完成初始时间信息。通过结合时间和光谱AUS数据，探索性研究已被支持为木材的NDT。已经对工作在25 kHz频率范围内的换能器进行了测试。耦合问题已经使用锥形穿透换能器部分解决。建立了一个采集站，并连接到示波器，放大器和能够计算AUS频谱特征的软件。选择了最大电压拾取，信号能量和递减函数作为NDE变量。将AUS变量应用于结构木材（实木）的样本后，似乎与木材强度相关。机械测试已经证实了相关性。添加到应力波信息中的AUS变量使木材强度的机械NDE增加了约25％。就等级和可靠性而言，此结果非常有趣。下一步是定义标准的工业收购方法并校准应用的开采模型。

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