Release Time:2019-11-01  Hits:

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: 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.