植物工場学会誌
Online ISSN : 1880-3555
Print ISSN : 0918-6638
ISSN-L : 0918-6638
カオスの概念を導入した果実の品質評価 (第1報)
果実の打音のアトラクターによる硬さの評価
森本 哲夫J. De BAERDEMAEKER羽藤 堅治
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2003 年 15 巻 4 号 p. 224-230

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Acoustic responses obtained by striking the fruit have been used for evaluating fruit firmness and maturity using a FFT method. However, those responses are often quite complex and uncertain. This study proposes a new technique to address such complex data. In the method, the attractor of the acoustic response is first described; then, its slope is calculated using the method of least squares. There was a close relationship between the slope of attractor and fruit firmness. The slope of attractor decreased in proportion to fruit firmness. Significant linearity was observed in the relationship between fruit firmness and the slope of attractor. This linearity was confirmed through simulation of a mechanical model (damped vibration model). These results showed that use of the attractor allowed quantitative evaluation of fruit firmness in the time-domain.
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