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

基于农产品动态特性的质量评价体系智能化、标准化研究

基本信息

批准号：
60860025
负责人：
IKEDA Yoshio
金额：
$ 7.42万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

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

为了利用农产品在贮藏过程中的动态响应来定量评价农产品的品质变化，研制了一台实验用串联式振动器。该装置由计算机控制，自动采集和处理数据。采用线性预测模型，即自回归模型（AR（10）模型）或自回归-滑动平均模型（阿尔马（4，3）模型）描述产品的动态行为，并给出了产品动态行为的参数表示。分别用Bur 'g最大熵法和基于卡尔曼滤波的递推最小二乘法对AR和阿尔马模型的参数进行估计。结果表明，阿尔马模型比AR模型包含的项数少，可以很好地模拟FFT方法估计的产品频响函数，但AR或阿尔马模型的预测系数与FFT方法估计的产品频响函数相差较大，而AR或ARMA模型的预测系数与FFT方法估计的产品频响函数相差较大。 ...更多信息由于这些参数的多维性，很难直观地将产品质量与这些参数联系起来。利用马氏广义距离对贮藏过程中的品质变化进行判别分析。判别分析的结果较好，说明判别是在样品间参数方差的影响下进行的，但仍需改进实验设备，实现稳定的激励，并指出这种马氏距离的变化可作为贮存过程中质量变化的定量指标。在不利的贮藏条件下，该距离的绝对值变大。研制了装有形状记忆合金驱动装置的实验夹持器，用于农产品的抓取。基础实验表明，该夹持器具有足够的抓取力，但响应速度较慢。少