Bond graph modeling and analysis of intermediary cooling system of a nuclear power plants

Abstract

This paper presents a bond graph (BG) model and a physical structural analysis of an intermediary cooling system of a power plant. The main goal is to extend the techniques already in use for the physical structural analysis of mechatronic systems to perform static analysis and diagnosis on physical models in order to state whether they are well-posed and suitable for each step of the system's lifecycle (from its design to its operation). If a problem for modeling, for simulating or for solving the given engineering question is detected, the analysis shall localize the problem in the model and give the physical interpretation of the error. The objective is not to be able to diagnose all possible physical errors, but to add another type of analysis in order to improve error detection before compiling and running a model.

Fault Diagnosis Using Bond Graphs in an Expert System

“…Subsequently, D. C. Karnopp and others further developed and improved it to form a systematic theoretical system [1]. Generally, a bond graph is used alone or in combination with other graphical models, functional observers, a statistical decision procedure, etc., to realize the fault diagnosis of mechanical components used in intermediary cooling systems of power plants [2], DC motors [3], stringing machines [4], six-tank systems [5], among others. In addition to using bond graph theory to establish the system fault model to realize equipment state identification and fault diagnosis, Sellami et al established bond graph linear fractional transformation models of an accelerometer based on fault detection and isolation algorithms to minimize false alarms and delays in fault detection [6].…”