The Flexural Response of a Submerged or Floating Body to an Underwater Explosion. Part I. Theory,

摘要

An underwater explosion forms a gas bubble which pulsates, generates a changing pressure field, and induces flexural vibrations in a floating or submerged ship. Equations are derived which couple the motion in each normal flexural mode to the pulsation of the bubble. Some special cases of target response are discussed. The analysis is shown to be applicable if the duration of the compressive phase, the shock wave, is small compared with the pulsation period of the bubble and with the flexural period of the target. Equations are also derived which give the modes shapes and frequencies for free vibration in water in terms of these modes and frequencies for free vibration in air. (Author)