A Systematic Method for Arranging Diagnostic Tests in Linear Analog DC and AC Circuits

Abstract

The paper deals with multiple soft fault diagnosis of linear analog circuits. The basic problem of arranging diagnostic tests performed in DC or AC states is considered in detail. A systematic method is developed that allows finding values of the sources applied to the excitation nodes as well as the measurement nodes at which the voltage variations due to the parameter deviations are sufficiently large. For this purpose the sensitivity analysis and the nonlinear programming technique, with appropriate objective function and constraints, are used. Four numerical examples reveal effectiveness of the proposed method for arranging the diagnostic tests.

Soft fault diagnosis of non‐linear circuits having multiple DC solutions

“…The measurement test is a key step in the process and influences its effectiveness. Several approaches of creating different tests carried out in a DC, an AC or a transient state, for various classes of circuits and diagnostic techniques are presented in [6, 7, 12, 14, 15, 17, 20, 24, 27].…”

Comparison of Filtering Methods for Enhanced Reliability of a Train Axle Counter System

“…There are well known approaches for smoothing (filtering) various signals [14]. Safety-related systems require standards [15] but there is also space in supporting systems for fault diagnosis [2,[16][17][18] and predictive maintenance [19] like fuzzy expert systems [20], neural networks [21], and also a filtering and smoothing algorithm [14]. However, the utilization of non-deterministic methods in a safety-related system (SIL-4) would be difficult due to uncertainty of the outcomes.…”