Calculation of wind load on an axisymmetric reflector antenna with arbitrarily oriented reflector relative to the wind flow

Abstract

One of the main factors in assessing the strength and stiffness of parabolic reflectors of stationary antenna systems is research of the force effect of the wind flow. The magnitude of the wind load depends on the wind speed and aerodynamic characteristics of the structure, which are determined by the geometry and orientation of the reflector relative to the direction of the wind flow. In order to determine extreme values of output parameters, calculations must be performed over a wide range of positions of the reflector and directions of wind flow. The paper proposes a method for estimating the loaded state of an axisymmetric reflector antenna with an arbitrary orientation of the reflector relative to the wind flow. This method is based on the analytical dependence of the angular position of the antenna relative to the direction of the wind flow, which allows to determine aerodynamic loads, with an arbitrary orientation of the reflector relative to the wind flow. It does not require CFD modeling for a given wind direction, and is based on predefined loads calculated in the basic coordinate system.