Journal
AUTOMATICA
Volume 65, Issue -, Pages 191-202Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.automatica.2015.11.028
Keywords
Output feedback; Uncertain nonlinear system; Input quantization; Sector-bounded quantizers
Funding
- 111 Project [B07031]
- National Basic Research Program of China (973 Program) [2013CB035406]
- National Natural Science Foundation of China (NSFC) [61134007, 61320106009]
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In this paper, we propose a new adaptive output-feedback tracking control scheme for a class of uncertain nonlinear systems with input quantized by a newly-proposed quantizer. This quantizer is a combination of a logarithmic (or a hysteresis) quantizer and a uniform quantizer, and it has the advantages of both logarithmic and uniform quantizers in ensuring reducible communication expenses and acceptable quantization errors for better system performances. Compared with existing results in adaptive control, the proposed scheme provides a way to relax certain restrictive conditions, in addition to solving the problem of adaptive output-feedback-control with input quantization. It is shown that the designed adaptive controller ensures global boundedness of all the signals in the closed-loop system and enables the tracking error to exponentially converge towards a compact set which is adjustable. (C) 2015 Elsevier Ltd. All rights reserved.
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