Measuring system for mechanical properties of trouble-handring agricultural materials

本课题的主要目的是研究一套用于测定土壤物理性质（杨氏模量、泊松比、水势有效系数等）的全测量系统的基本原理。由于其尺寸、形状和不均匀性，在材料试验中处理起来很麻烦的植物材料。本课题的基础研究是建立基于有限元反分析的数值数据处理系统和应用图象处理技术的变形测量系统。本课题的阅读结果和进展如下：1.在微型计算机上实现了有限元反分析。有限元反分析程序可处理二维轴对称弹性问题。2.采用两种不同的参数估计技术。3.在微机上实现了有限元反分析程序。4.在微机上实现了有限元反分析程序。5.在微机上实现了有限元反分析程序。6.在微机上实现了有限元反分析程序。7.在微机上实现了有限元反分析程序。8.在微机上实现了有限元反分析程序。9.在微机上实现了有限元反分析程序。10.在微机上实现在有限元反问题的研究过程中，本文对两种方法进行了研究：1）最小二乘估计法; 2）卡尔曼滤波估计法; 3）卡尔曼滤波法的收敛性优于最小二乘估计法; 4）采用两种不同的方法测定试件在压缩状态下的变形：1）红外位移传感器; 2）红外位移传感器图像处理装置5.红外传感装置仅在处理相对较大的试样时才有用和有效6.使用图像处理装置的方法更灵活，可以处理许多不同尺寸的试样。以土地生产力为基础。

The objective of this research project is to study basics of a sevelopment of total measuring system for determining the physical properties(Young's modulus,poison'sratio,water potential effective coefficients edt.) of plant materials whose handling is throublesome in the material tests due to their size,shape,inhomogeneity. The basic studies of this project dealt with a numerical data process system based on the finite element inverse analysis and a deformation measuring system using image processing technique.The followings are reading findings and developments in this project.1.A Finite element inverse analysis is implemented on a microcomputer.The FEM inverse program can handle 2 dimentional axisymmetric elasticity problems.2.Tow different parameter estimation techniques were investigated in process of the development of FEM inverse code.1)Least square estimation 2)Kalman filter estimation3.Convergence of Kalman filter technique is much better than the least square technique.4.Two different techniques were tested to determine the deformation of test piece under compression.1)Infra red displacement sensing device 2)image processing device5.The infra red sensing device was useful and effective only when hadling relatively larger test piece6.The method using image processing device was more flexible to handling samples in many different sizes. yield based on land productivity.