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The Study of the Relationship between the Eggshells' Crack Locations and the Detecting Points
|關鍵字:||蛋殼裂痕;Eggshells' crack;聲浪;振幅衰減;acoustics;amplitude attenuation||出版社:||臺中巿： 國立中興大學農學院||Project:||農林學報, Volume 50, Issue 4, Page(s) 57-78.||摘要:||
This study investigated the relationship between the eggshells' crack and detecting points by means of acoustics, and then found out the effective detecting range. Based on those data, it provided the number of the examining points and the way of their arrangements, which could make an effective application to the develop on automatic eggshells' detecting system. The experiment includes two parts. Firstly, knocking a 5mm crack on each of 14 perfect eggshells at 14 different locations. It obtained the differences of amplitude attenuation between the eggshell before and after knocking. From the results, it showed that the waveform converged and disappeared very fast when knocking at or around the crack. However, the behavior was not the same as previous phenomenon when knocking at the perfect part. Secondly, it knocked on eggshells by using sound-gathering tube to find out and analyze the effective measuring rage. The results showed that the effective range is about 20 to 30mm. Therefore, the conservative estimate was suggested to choose 20mm as an effective measuring range. According to those fundamental data, it was recommended that the best number of detecting points was 12 and distance between each two points was less than 40mm.
|Appears in Collections:||第50卷 第04期|
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