Multi-objective Grid-based Lipschitz NLPV PI Observer for Damper Fault Estimation

Gia Quoc Bao Tran (1, 2) , Thanh-Phong Pham (3) , Olivier Sename (1)

1 GIPSA-SAFE - GIPSA - Safe, Controlled and Monitored Systems
2 CAS - Centre Automatique et Systèmes
3 Dai Hoc Da Nang - University of Danang [Vietnam]

Dampers in semi-active suspension systems may be subject to various types of damper faults, e.g., oil leakage and electrical issues, that need to be estimated for diagnosis and isolation purposes. A new method to design the so-called multi-objective grid-based Lipschitz Nonlinear Parameter Varying (NLPV) Proportional Integral (PI) observer is here developed for damper fault estimation, where the fault is the loss of efficiency of the damper modeled as a slow-varying input. While the damper nonlinearity is bounded by the Lipschitz condition, the H∞ and generalized H2 conditions are used to minimize the effects of the input disturbance and the measurement noise, respectively, on the estimation error. Moreover, the observer is designed with Linear Matrix Inequalities (LMIs) formed and solved in a grid-based manner (considering a parameter-dependent Lyapunov function) to reduce the level of conservatism. Analyses in the frequency domain using Bode plots as well as in the time domain using realistic simulations illustrate the effectiveness of the proposed observer.

Mots clés: PI observer; Nonlinear Parameter Varying (NLPV); gridding; fault estimation; semi-active suspension

Domaines: Automatique; Systèmes et contrôle [cs.SY]; Systèmes dynamiques [math.DS]; Optimisation et contrôle [math.OC]

Gia Quoc Bao Tran, Thanh-Phong Pham, Olivier Sename. Multi-objective Grid-based Lipschitz NLPV PI Observer for Damper Fault Estimation. SAFEPROCESS 2022 - 11th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, Jun 2022, Pafos, Cyprus. ⟨10.1016/j.ifacol.2022.07.123⟩. ⟨hal-03611561⟩