Asynchronous auxiliary signal design for failure detection

Fault detection and identification (FDI) are important tasks in most modern industrial systems and processes. A variety of approaches both active and passive have been investigated. A test signal or input is used in an active approach. Usually in the active approach the same time window is used for the running of the test and the application of the test signal. However, that is not always the most desirable or practical thing to do. The effect of different signal and observation windows is investigated here for one active approach.