{"id":24676,"date":"2023-03-04T05:21:02","date_gmt":"2023-03-04T05:21:02","guid":{"rendered":"https:\/\/www.vias3d.com\/blogs\/design-of-dish-antenna-under-an-extreme-wind-event\/"},"modified":"2024-08-16T12:43:01","modified_gmt":"2024-08-16T12:43:01","slug":"design-of-dish-antenna-under-an-extreme-wind-event","status":"publish","type":"post","link":"https:\/\/vias3d.live\/in\/blogs\/design-of-dish-antenna-under-an-extreme-wind-event\/","title":{"rendered":"Design of Dish Antenna Under an Extreme Wind Event"},"content":{"rendered":"[vc_row type=”in_container” full_screen_row_position=”middle” column_margin=”default” column_direction=”default” column_direction_tablet=”default” column_direction_phone=”default” scene_position=”center” text_color=”dark” text_align=”left” row_border_radius=”none” row_border_radius_applies=”bg” overflow=”visible” overlay_strength=”0.3″ gradient_direction=”left_to_right” shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_tablet=”inherit” column_padding_phone=”inherit” column_padding_position=”all” column_element_direction_desktop=”default” column_element_spacing=”default” desktop_text_alignment=”default” tablet_text_alignment=”default” phone_text_alignment=”default” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_backdrop_filter=”none” column_shadow=”none” column_border_radius=”none” column_link_target=”_self” column_position=”default” gradient_direction=”left_to_right” overlay_strength=”0.3″ width=”1\/1″ tablet_width_inherit=”default” animation_type=”default” bg_image_animation=”none” border_type=”simple” column_border_width=”none” column_border_style=”solid”][vc_column_text]Introduction<\/b><\/span><\/p>\n

Wind loading on dish antenna is an important parameter in designing the antenna structure for communication integrity. The concave shaped reflector surface is the key component for the communications and the deformation caused by wind loading could potentially affect the resolution and sensitivity of the antenna\u2019s performance. <\/span><\/p>\n

Wind loads and corresponding deformations on the surface can be estimated accurately through one-way coupled Fluid Structure Interaction (FSI). This approach provides a faster and cost-effective approach to estimate the effects of the wind loading on the structures. In the current one-way coupled FSI approach, CFD estimated pressure distribution on the dish surface is mapped to the FE model to estimate the dish surface deformations due to wind loading.<\/span><\/p>\n

To estimate the wind loading, a commonly used parabolic dish antenna is used to determine the maximum loading on the dish antenna. The wind loads and drag coefficients are estimated for different wind angles to determine the direction of the maximum loading on the dish surface. For maximum loading conditions, pressure distribution on the dish surface is mapped to the Finite Element model to estimate the maximum surface deformation. Figure 1 shows a simplified model of the parabolic dish frame with antenna. <\/span><\/p>\n

\"\"Figure 1: Parabolic Dish Frame with Antenna<\/strong> <\/span><\/p>\n

SIMULIA XFlow \u201cExternal Aero\u201d template was used to build the virtual wind tunnel around the dish antenna as shown in Figure 2. XFlow inbuilt wake resolution option was used to capture the wake downstream of the dish antenna. <\/span><\/p>\n

\"\"Figure 2: Computational Domain<\/span><\/strong><\/p>\n

The analysis was performed at 15-degree orientations starting from 0 degree to 90-degree tilt angles. Figure 3 shows the velocity field around the dish for different wind directions. The velocity in the front of dish structure moves towards a stagnation condition and at the edges of dish structure the velocity values increase to maintain continuity. As a result, the velocity behind the dish is reduced and strong recirculating vortices are generated due to reduced pressure in the dish\u2019s wake.<\/span><\/p>\n