Robust Identification Using Semiquantitative Methods

: While model-based process monitoring and system identification share the common goal of describing the behavior of a physical system based on a mathematical model, the assumptions made by system identification are typically too strong to apply it directly to monitoring problems. This article describes SQUID, a new system identification method that uses refutation rather than search to identify a model of a physical system. By ruling out implausible models rather than searching for the best model that fits the data, SQUID is more robust in the face of uninformative data and structural model uncertainty than are traditional identification methods. Keywords: System identification, Monitoring, Diagnosis, Qualitative simulation, Numerical simulation 1. INTRODUCTION This article describes SQUID (for SemiQUantitative IDentifier), a new system identification (SI) method that uses refutation rather than search to refine a model space of Ordinary Differential Equations (ODEs). SQUID was design..