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Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.6 P.483-490


Firmness evaluation of melon using its vibration characteristic and finite element analysis

Author(s):  NOURAIN Jamal, YING Yi-bin, WANG Jian-ping, RAO Xiu-qin, YU Chao-gang

Affiliation(s):  Department of Biosystems Engineering, Institute of Modern Agricultural Equipment and Automation, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   ybying@zju.edu.cn

Key Words:  Melon, Sensing, Finite element, Experimental modal analysis, Firmness

NOURAIN Jamal, YING Yi-bin, WANG Jian-ping, RAO Xiu-qin, YU Chao-gang. Firmness evaluation of melon using its vibration characteristic and finite element analysis[J]. Journal of Zhejiang University Science B, 2005, 6(6): 483-490.

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author="NOURAIN Jamal, YING Yi-bin, WANG Jian-ping, RAO Xiu-qin, YU Chao-gang",
journal="Journal of Zhejiang University Science B",
publisher="Zhejiang University Press & Springer",

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%T Firmness evaluation of melon using its vibration characteristic and finite element analysis
%A YING Yi-bin
%A WANG Jian-ping
%A RAO Xiu-qin
%A YU Chao-gang
%J Journal of Zhejiang University SCIENCE B
%V 6
%N 6
%P 483-490
%@ 1673-1581
%D 2005
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2005.B0483

T1 - Firmness evaluation of melon using its vibration characteristic and finite element analysis
A1 - NOURAIN Jamal
A1 - YING Yi-bin
A1 - WANG Jian-ping
A1 - RAO Xiu-qin
A1 - YU Chao-gang
J0 - Journal of Zhejiang University Science B
VL - 6
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SP - 483
EP - 490
%@ 1673-1581
Y1 - 2005
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2005.B0483

The “Huang gua” melons were measured for their physical properties including firmness and static elastic modulus. The vibrational characteristics of fruits and vegetables are governed by their elastic modulus (firmness), mass, and geometry. Therefore, it is possible to evaluate firmness of fruits and vegetables based on their vibrational characteristics. Analysis of the vibration responses of a fruit is suggested for measuring elastic properties (firmness) non-destructively. The impulse response method is often used to measure firmness of fruits. The fruit was excited using three types of balls (wooden, steel and rubber) and the vibration is detected by an accelerometer. The Instron device was used to measure the static elastic modulus of the inner, middle and outer portions of melon flesh. finite element (FE) technique was used to determine the optimum excitation location of the chosen measurement sensor and to analyze the mode shape fruits. Four types of mode shapes (torsional or flexural mode shape, first-type, second-type spherical mode and breathing mode shape) were found. finite element simulation results agreed well with experimental results. Correlation between the firmness and resonant frequency (r2=0.91) and between the resonant frequency and stiffness factor (r2=0.74) existed. The optimum location and suitable direction for excitation and response measurement on the fruit were suggested.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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