Structural analysis of two-axis marine radar system
First 2 Mode Shapes of System |
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Transient Dynamic Analysis – Bump Test |
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Objective:
Battle ships rely on radars to capture enemy and navigation data accurately. The radar system consists of two parts; the payload which is the receiver along with its sensitive electronics and the mechanical system which carries the payload. Mechanisms are of different types; single axis, dual-axis, rotating type and swivel type. They need to be extremely robust for the payload to capture accurate data. A dynamic analysis of a two-axis radar system was to be carried out to determine the dynamic response at payload locations.
Methodology:
All major structural members are modeled with solid brick elements. Spindles are idealized using 3D beam elements and other major components were modeled using 3D point mass elements Static analysis was performed for self-weight along with the wind loads. The equipment was also studied for dynamic response under frequency response and bump test conditions.
In order to keep the natural frequency above operating range, the structure was modified by adding vertical stiffeners at the cradle. It was found that, stresses and deformations under frequency sweep and bump test conditions were within allowable limits.
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