Application of Fully Decoupled Parity Equation in Fault Detection and Identification of DC Motors

Abstract

A multiple fault detection and identification method based on fully decoupled parity equations for dynamic systems with known linear and unknown nonlinear terms is presented. The fully decoupled parity equation vectors is derived and it is shown that the residuals generated from it are decoupled from other faults and the unknown nonlinear term and are sensitive only to specific actuator or sensor faults. The condition for the existence of the equation is also given. From the residuals generated from the fully decoupled parity equation, the faults are estimated using the recursive least-squares method. The performance of the proposed method is illustrated by applying it to detect, isolate, and identify faults in a simulated dc motor.

Online fault detection and isolation of nonlinear systems based on neurofuzzy networks

“…However, it may not always be possible to isolate faults directly from the residuals. Specific techniques, such as the parity equation (Gertler, 1998;Chan et al, 2006) and other methods (Isermann, 2005) are developed for fault isolation.…”

Sensor Fault Detection and Diagnosis for autonomous vehicles

“…The residuals that differ from the nominal values are called symptoms and can be subject to a symptom-fault classification in order to detect a fault and its location (fault diagnosis) [1]. Model based methods are categorized as parity equations [2,3], parameter estimation methods [4], and observer-based methods with Luenberger observers [5] or Kalman filters [6]. These methods are very popular for fault tolerant control systems.…”

Multimedia Educational Material and Remote Laboratory for Sliding Mode Control Measurements

“…DC motors have played a special historical role in the field of industrial electronics since all industrial servo drives used DC motors in the past and the first microprocessor controlled drive [6] also applied DC motor. Even if they have several drawbacks they are used in recent applications [7]- [9]. The main advantage of a DC servo motor drive is that it is simple from the point of view of control.…”