Measuring system for mechanical properties of trouble-handring agricultural materials

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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.