An exponentially stable adaptive friction compensator

Teh Lu Liao, Tsun I. Chien

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


This note presents a novel adaptive compensation scheme for Coulomb friction in a servocontrol system. An adaptive observer for estimating the unknown Coulomb friction coefficient is also derived on the basis of the Lyapunov technique. In addition, a linearizing control law is developed to compensate for the friction force and obtain the tracking objective. The proposed adaptive compensation guarantees an exponential convergence for state errors and parameter error, and the adaptive schemes in [1] and [3] guarantee only an asymptotic (or stable) convergence. Simulation results demonstrate the effectiveness of the proposed method for a single-mass servocontrol system.

Original languageEnglish
Pages (from-to)977-980
Number of pages4
JournalIEEE Transactions on Automatic Control
Issue number5
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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