Digital Generation of Alongwind Velocity Field

by Masanobu Shinozuka, (M.ASCE), Prof. of Civ. Engrg.; Columbia Univ., New York, N.Y.,
Roy Levy, (M.ASCE), Member; Technical Staff, Jet Propulsion Lab., California Inst. of Tech., Pasadena, Calif.,

Serial Information: Journal of the Engineering Mechanics Division, 1977, Vol. 103, Issue 4, Pg. 689-700

Document Type: Journal Paper


The loss of surface efficiency performance of a paraboloidal reflector antenna results from various sources. In particular, the surface deformation from its ideal paraboloidal shape due to random wind and temperature as well as deterministic gravity loading is an important factor to be considered. The loss of efficiency associated with the surface deformation is usually measured in terms of the rms of the half-path length difference of the microwave (RF) energy beam. When the reflector surface is subjected to such random loading as environmental wind pressures, the rms value is also a random quantity and its statistical variation is of obvious engineering significance. The present paper proposes use of a Monte Carlo method of estimating such statistical variation of the rms value and describes in detail how digital generation of the two-dimensional wind velocity field, which plays a vital role in the current Monte Carlo approach, can be carried out.

Subject Headings: Gravity loads | Wind loads | Paraboloid | Deformation (mechanics) | Wind pressure | Statistics | Monte Carlo method | Antennas | Monaco | Europe

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