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Evaluation of pear firmness by dynamic characteristics of drop impact
Author(s) -
Wang Jun,
Ying Tiejing,
Cheng Kuchuan
Publication year - 2007
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2781
Subject(s) - pear , drop impact , drop (telecommunication) , chemistry , horticulture , botany , materials science , biology , composite material , wetting , telecommunications , computer science
The dynamic resonance frequency based on the dynamic frequency response of pear dropped onto a flat plate was determined by impacted orientation, drop height, material of impact surface, pear firmness and pear mass. Response signals in time domain were detected, and transformed into frequency domain (by means of fast Fourier transform). The dominant frequency (the response magnitude is the greatest) was significantly affected by pear firmness and pear mass. Impact orientation, drop height and impact surface material did not significantly affect the dominant frequency. The dominant frequency increased with increase of pear firmness, and decreased with increasing pear mass. Good relationships were obtained between dominant frequency and Magness–Taylor or pear mass ( r 2 = 0.716 and 0.771), and the stiffness index ( S c = f 2 m 2/3 ) regressed on Magness–Taylor firmness had better relationship also r = 0.819). Pear firmness can be predicted by the drop impact method. Copyright © 2007 Society of Chemical Industry