This experiment aims to study the effects and modifications that occurred on\nacoustic signal harmonics when travelling through wood. The experiment\nmeasured the output amplitudes and frequencies of the travelling signals and\ncompared them with the original input signal. The factors under investigation\nin this experiment included: wood type, wood moisture content (MC), input\nsignal frequencies, signal travelling distance and wood condition (wood\nwith/without cracks). The experiment findings demonstrated that higher input\nsignal frequencies results in higher attenuation of acoustic emissions (AE)\ntravelling through the wood. The results also indicate that: wood type, MC,\nthe signalâ??s travelling distance, and the orientation of the travelling signal,\ncompared to the woodâ??s grain direction, affected the signal propagation.
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