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Study on a novel panel support concept for radio telescopes with active surface
Dehua Yang; Guohua Zhou; Daniel Okoh; Guoping Li; Jingquan Cheng
Source PublicationModern Technologies in Space- and Ground-based Telescopes and Instrumentation
PagesVol.7739 1G-1-13
Conference Date2010-6-27
Conference PlaceSan Diego, California, USA
Funding OrganizationThe International Society for Optical Engineering
Generally, panels of radio telescopes are mainly shaped in trapezoid and each is supported/positioned by four adjustors beneath its vertexes. Such configuration of panel supporting system is essentially hyper-static, and the panel is overconstrained from a kinematic point of view. When the panel is to be adjusted and/or actuated, it will suffer stress from its adjusters and hence its shape is to be distorted. This situation is not desirable for high precision panels, such as glass based panels especially used for sub-millimeter and shorter wavelength telescopes with active optics/active panel technology. This paper began with a general overview of panel patterns and panel supports of existing radio telescopes. Thereby, we proposed a preferable master-slave active surface concept for triangular and/or hexagonal panel pattern. In addition, we carry out panel error sensitivity analysis for all the 6 degrees of freedom (DOF) of a panel to identify what DOFs are most sensitive for an active surface. And afterwards, based on the error sensitivity analysis, we suggested an innovative parallel-series concept hexapod well fitted for an active panel to correct for all of its 6 rigid errors. A demonstration active surface using the master-slave concept and the hexapod manifested a great save in cost, where only 486 precision actuators are needed for 438 panels, which is 37% of those actuators needed by classic segmented mirror active optics. Further, we put forward a swaying-arm based design concept for the related connecting joints between
panels, which ensures that all the panels attached on to it free from over-constraints when they are positioned and/or actuated. Principle and performance of the swaying-arm connecting mechanism are elaborated before a practical cablemesh based prototype active surface is presented with comprehensive finite element analysis and simulation.
KeywordRadio Telescope Panel Support Active Surface Master-slave Concept Swaying-arm Mechanism Finite Element Analysis
Subject Area射电望远镜 ; 主动光学
Document Type会议论文
Recommended Citation
GB/T 7714
Dehua Yang,Guohua Zhou,Daniel Okoh,et al. Study on a novel panel support concept for radio telescopes with active surface[C]:SPIE,2010:Vol.7739 1G-1-13.
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