Qualitative Description of Nonlinear Systems via Fuzzy Modeling

• Main Authors: Yu-Shuo Chang, 張育碩
• Other Authors: Pei-Hwa Huang
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/69838465840007823151

碩士 === 國立海洋大學 === 電子工程學系 === 84 === The main purpose of this thesis is to study the construction of the qualitative model based on the fuzzy model of systems so as to realize the behavior and characteristics of systems. In this thesis, instead of mathematical models, we try to establish the fuzzy model to describe nonlinear systems according to their input-output data. Then the qualitative model is constructed based on the definition of fuzzy variables so that the behavior and characteristics of systems can be analyzed accordingly. The procedure is as follows : firstly, the mountain clustering method and the back-propagation method are applied to establish the fuzzy model of systems. The fuzzy c- means method is subsequently used to define the membership function of the fuzzy variables. Secondly, the fuzzy model is converted to the qualitative model described by fuzzy variables to derive the qualitative description of systems. Some examples of physical systems are given to demonstrate the feasibility of our proposed method.