Non-linear system identification and fault diagnosis using a new GUI interpretation tool Original Research Article

There are two major contributions which are described in this paper. Firstly, a new graphical user interfaces (GUI) interpretation tool for the non-linear frequency response functions (FRF) is proposed. The tool is developed by pv-wave package to provide better ways and user friendly of displaying, interpreting and analysing of non-linear systems with significant non-linear effects. Secondly, the application of this identification tool for fault detection, identifying in the civil engineering. To demonstrate the improved visualisation and interpretation of the multi-dimensional non-linear FRF and the application of the non-linear auto-regressive moving average model with exogenous input (NARMAX) methodology, two engineering applications have studied including a non-linear oscillator and fault diagnosis in civil engineering structures. The results obtained have shown that the interpretation of the higher-order FRF has been comprehensively studied and non-linear effects have been related back to the physical models of the systems.