Abstract
As for the issue of ship-board rocket gun launch, the research on the influence of sea condition on initial disturbances of rockets was conducted. The launch system was simplified and the dynamics model was established. The energy spectral density of motion of ship in irregular waves was calculated based on ocean wave energy spectrum and the dynamic response of launch system was studied under three kinds of sea conditions. The result indicates that amplitudes of pitch and yaw increase, however, the rolling decreases when the sea condition level rises.
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