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Lateral impact vibration is a simple method for diagnosing the wood quality inside a standing tree. The product d・f of the resonance frequency f of the vibration or the sound of an impacted tree stem and the stem diameter d serves as the index of the diagnosis. To study the effect of the weight of hammers on the detection of f, 21 large sample trees from among nine species were impacted by eight types of hammers (ranging in weight from 101 to 3250 g). It was possible to determine f for all sample trees. Therefore, it was confirmed that this method can also diagnose the wood quality of large standing trees using the index d・f. The frequency peaks tended to be prominent in lower frequency ranges upon impact with heavier hammers. The relationship between the weight of the hammers and the power of detecting f was studied. The results indicated that the power tended to be higher with an increase in hammer weight (R=0.54-0.99). These results show that in the diagnosis of large living trees by the lateral impact vibration method, heavier hammers were more suitable for detecting the resonance frequency f. In addition, the adequate hammer weight for practical use was discussed, considering both lightness and the power of detecting f.

Effect of Weight of Hammers on Detection of Resonance Frequency by the Lateral Impact Vibration Method for Large Living Trees of 9 Species