3. An antenna on a ground station can be geometrically approximated by a 60cm diameter sphere...
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3. An antenna on a ground station can be geometrically approximated by a 60cm diameter sphere mounted on a 0.15m diameter cylinder 1.95m long. Estimate the bending moment to the root of the cylinder due to aerodynamic forces during: (a) Winter storm winds of 30m/s and an air temperature of -6C; and (b) at a wind speed of 10m/s and an air temperature of 28C. You may use the data below. (12 marks) (c) State any assumptions you make and comment on your answers. Physical properties of air at standard sea-level atmospheric pressure Temperature TC Density p kg/m Viscosity x 10-6 Ns/m 1.342 16.6 1.293 17.1 1.248 17.6 1.205 18.1 1.165 18.6 -10 0 10 20 30 Approximate Transitional Reynolds Numbers Smooth circular cylinder 3.7 105 Smooth surfaced sphere 2.2 105 Coefficient of Drag Cylinder Sphere Laminar Turbulent 1.2 0.47 (12 marks) 0.3 0.2 (1 mark) 3. An antenna on a ground station can be geometrically approximated by a 60cm diameter sphere mounted on a 0.15m diameter cylinder 1.95m long. Estimate the bending moment to the root of the cylinder due to aerodynamic forces during: (a) Winter storm winds of 30m/s and an air temperature of -6C; and (b) at a wind speed of 10m/s and an air temperature of 28C. You may use the data below. (12 marks) (c) State any assumptions you make and comment on your answers. Physical properties of air at standard sea-level atmospheric pressure Temperature TC Density p kg/m Viscosity x 10-6 Ns/m 1.342 16.6 1.293 17.1 1.248 17.6 1.205 18.1 1.165 18.6 -10 0 10 20 30 Approximate Transitional Reynolds Numbers Smooth circular cylinder 3.7 105 Smooth surfaced sphere 2.2 105 Coefficient of Drag Cylinder Sphere Laminar Turbulent 1.2 0.47 (12 marks) 0.3 0.2 (1 mark)
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Related Book For
Shigleys Mechanical Engineering Design
ISBN: 978-1121345317
9th edition
Authors: Richard G. Budynas, J. Keith Nisbett
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