Studies on Intellectualization and Standardization of Quality Evaluation System by Dynamic Characteristics of Agricultural Products

点击翻译按钮获取中文摘要

For the Uanatitative evaluation of Quality change of the agricultural products during storage with their dynamic response, the experimental tandom vibrator was produced for the whole intact products. This apparatus was computer controlled to aquire and process the data automatically. The linear prediction models were adopred to describe the dynamic behavior of the products, that is, the autoregressive model(AR(10) mode) or the autoregressive-moving average mode(ARMA(4,3) model), and the parametric representations of the dynamics of the products were proposed. The parameters of the AR and ARMA model were estimated with the Bur'g Maximum Entropy Method(MEM) and the Recursive Least Square Method(RLSM) based upon the Kalman Filtering, respectively. It was shown that the ARMA model containing the smaller number of terms than the AR model could simulate the frequency response functions of the products estimated with the FFT method.Though the prediction coefficients of the AR or ARMA model ma … More y be assumed to express quantitatively the dynamic characteristics of the products, it may be difficult to relate the product quality to these parameters intutively because of their multi-demensionality. Then, the discriminant analysis of the quality change during storage was performed with the Mahalanobis's generalized distance. The results of the discriminant analysis were fairly good it seemed that the discriminant was performed under the influences of the variance of the paramters between samples, The improvement of the experimental appsratus and the realization of the stable excitation will be necessary.It was shown that the change in this mahalanobis distance during storage could be used as quantitative indexes representing the quality change. This distance inctreased during storage and their absolute values became longer under the unfavorable storage conditions.The experimental gripper equiped the driving device made of the shape memory alloy was produced for handling the agricultural products. It was shown through the fundamental experiment that this gripper had the enough grasping force but the slow response speed. Less