국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	The Effect of Boundary Support and Reflector Dimensions on Inflatable Parabolic Antenna Performance
저자	Coleman, Michael J.;; Baginski, Frank;; Romanofsky, Robert R.
Keyword	ANTENNA DESIGN;; HYDROSTATIC PRESSURE;; LARGE SPACE STRUCTURES;; MEMBRANE STRUCTURES;; MICROWAVE ANTENNAS;; NUMERICAL ANALYSIS;; PANELS;; PARABOLIC ANTENNAS;; REFLECTORS;; SHAPES;; STRESS-STRAIN RELATIONSHIPS;; STRUCTURAL DESIGN
URL	http://hdl.handle.net/2060/20110023748
보고서번호	NASA/TM-2011-217110
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	For parabolic antennas with sufficient surface accuracy, more power can be radiated with a larger aperture size. This paper explores the performance of antennas of various size and reflector depth. The particular focus is on a large inflatable elastic antenna reflector that is supported about its perimeter by a set of elastic tendons and is subjected to a constant hydrostatic pressure. The surface accuracy of the antenna is measured by an RMS calculation, while the reflector phase error component of the efficiency is determined by computing the power density at boresight. In the analysis, the calculation of antenna efficiency is not based on the Ruze Equation. Hence, no assumption regarding the distribution of the reflector surface distortions is presumed. The reflector surface is modeled as an isotropic elastic membrane using a linear stress-strain constitutive relation. Three types of antenna reflector construction are considered: one molded to an ideal parabolic form and two different flat panel design patterns. The flat panel surfaces are constructed by seaming together panels in a manner that the desired parabolic shape is approximately attained after pressurization. Numerical solutions of the model problem are calculated under a variety of conditions in order to estimate the accuracy and efficiency of these antenna systems. In the case of the flat panel constructions, several different cutting patterns are analyzed in order to determine an optimal cutting strategy.