Design for an adaptive fuzzy signed distance sliding mode control

Wen Hou Chu, Pi Cheng Tung

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a adaptive fuzzy logical controller (AFLC) design method incorporating a single fuzzy input variable signed distance ds, which is equivalent to the pseudo sliding mode controller (pseudo-SMC). Based on the similarity between the control rule table for the commonly used FLCs and an ordinary SMC with a boundary layer, the single input variable signed distance ds can be used to reduce the number of fuzzy reasoning rules in comparison with the conventional two-dimensional FLCs. A hitting control part that satisfies the hitting conditions of the SMC can force the system's states to reach and remain on the sliding. An adaptive law derived from a Lyapunov function, is used to obtain the FLCs parameters, and is applied to approximate the equivalent control part of the SMC such that the system states can be forced to zero. Therefore, the stability of the adaptive fuzzy signed distance sliding mode control (AFSDSMC) can be guaranteed. We used the AFSDSMC to control an automatic shield metal arc welding (SMAW) control system. The simulation results confirm that the expected approximation sliding property occurs. The experimental results of the automatic SMAW control system verify the feasibility of the proposed controller and also show that it can effectively perform the arc welding.

Original languageEnglish
Pages (from-to)21-30
Number of pages10
JournalTransactions of the Aeronautical and Astronautical Society of the Republic of China
Volume37
Issue number1
StatePublished - Mar 2005

Keywords

  • Adaptive fuzzy sliding mode
  • Shielded metal arc welding
  • Signed distance

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