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。
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 watermelon＇s 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.
出处
《浙江农业学报》
CSCD
北大核心
2016年第4期682-687,共6页
Acta Agriculturae Zhejiangensis
基金
江苏省食品先进制造装备技术重点实验室开放课题(BM2013001)
江苏省产学研联合创新资金(BY2014023-32)
江南大学基本科研青年基金项目(1072050205134580)
关键词
西瓜
敲击振动
贮藏时间
多元线性回归
watermelon
tapping vibration
storage time
multiple linear regression
