| 基于声振法的西瓜贮藏时间检测 |
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| 引用本文： | 陆勇,李臻峰,浦宏杰,汪迪松.基于声振法的西瓜贮藏时间检测[J].浙江农业学报,2016,28(4):682. |
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| 作者姓名： | 陆勇 李臻峰 浦宏杰 汪迪松 |
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| 作者单位： | （1.江南大学 机械工程学院，江苏 无锡 214000； 2.江苏省食品先进制造装备技术重点实验室，江苏 无锡 214000） |
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| 摘 要： | 为了研究贮藏时间对西瓜振动特性的影响，在自行设计的声学振动检测试验平台上，利用声振法检测西瓜的振动频率随贮藏时间的变化规律。结果表明，提取的频响信号中第一响应基频频率与西瓜贮藏时间的相关性较好，建立第一响应基频频率与贮藏时间的三阶非线性函数模型，相关系数R2可达0.919 1。通过选取多个振动特征值建立西瓜贮藏时间的逐步多元线性回归模型，结果表明，将激励点和接收点分别放在西瓜的瓜梗和瓜蒂处可获得最佳的测定模型，模型的相关系数、标准估计误差分别为0.931 3和1.812 0，这为西瓜采摘后的贮藏与销售提供了参考。
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| 关 键 词： | 西瓜 敲击振动 贮藏时间 多元线性回归 |
Determination of storage time of watermelon based on acoustic impulse method |
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| LU Yong,LI Zhen feng,PU Hong jie,WANG Di song.Determination of storage time of watermelon based on acoustic impulse method[J].Acta Agriculturae Zhejiangensis,2016,28(4):682. |
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| Authors: | LU Yong LI Zhen feng PU Hong jie WANG Di song |
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| Institution: | （1. School of Mechanical Engineering， Jiangnan Univerity， Wuxi 214000， China; 2. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology， Wuxi 214000， China） |
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| Abstract: | In order to study the effects of storage time on acoustic properties of watermelons， the changes of vibration response frequency of watermelon were studied by the way of percussion with the vibration detection system designed by our lab. The results showed that the first response fundamental frequency had a good correlation with storage time， and then a nonlinear function model was established， the correlation coefficient was 0.919 1. By selecting multiple vibration eigenvalues， a multiple linear regression model was established to describe storage time. Test analysis of the watermelon samples showed that it could get the best measurement model when placing the excitation and receiving points at the watermelons stem and stalk， respectively. The correlation coefficient and standard estimation error of this model was 0.931 3 and 1.8120， respectively. It provided a reference for the storage and sale of watermelon after picking. |
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| Keywords: | watermelon tapping vibration storage time multiple linear regression |
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