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Indexed by:Journal Papers

Date of Publication:2019-11-01

Journal:JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES

Included Journals:SCIE

Volume:30

Issue:18-19

Page Number:2733-2747

ISSN No.:1045-389X

Key Words:antenna reflector; active shape control; piezoceramic actuator; influence coefficient matrix

Abstract:The surface precision of an antenna reflector can be improved using the actuation of piezoelectric materials to obtain a high-performance space antenna. In this study, the active shape control of a reflector with piezoceramic (lead zirconate titanate) actuators assembled on ribs is proposed by theoretical and experimental approaches. A finite element model of the integrated reflector-actuator system is established using piezoelectric constitutive equations and the virtual work's principle. For a desired shape, a closed-loop iterative shape control method based on the influence coefficient matrix model is developed, which resolves the issue of high-precision shape control of the antenna reflector in the presence of model errors. The shape controller based on the proposed closed-loop shape control method is implemented on a planar hexagonal reflector with 30 lead zirconate titanate actuators. Experimental results demonstrate that the closed-loop control is an effective way to improve the surface precision of the reflector considering uncertainties.