Ship motion response prediction method considering damping effect under underwater explosion effect

Abstract

The invention discloses a ship motion response prediction method considering a damping effect under an underwater explosion effect. The ship motion response prediction method comprises the steps: simplifying a ship into a uniform-section free hull beam; establishing a forced motion control equation of the hull beam considering the structural damping, and determining motion displacement functions of the inner beam in different pressure stages when the structural damping is considered according to the forced motion control equation; according to preset dimensionless damping ratio parameters andpressure distribution functions in the length direction of the hull beam at different pressure stages, determining a main coordinate function of hull beam motion deformation; calculating a motion displacement function of the hull beam in a corresponding pressure stage, and solving deformation parameters of the hull beam in different pressure stages according to the motion displacement function; determining a motion amplitude and a relative rotation angle of the hull beam in different motion deformation processes. According to the method, the ship plastic motion process is analyzed by considering the damping effect, engineering prediction of ship structure motion deformation under the underwater explosion effect can be accurately, easily and conveniently achieved, and prediction errors arereduced.

Description

technical field [0001] The invention belongs to the technical field of anti-underwater explosion impact motion prediction technology of ship structure, and more specifically relates to a method for predicting ship motion response under underwater explosion considering damping effect. Background technique [0002] The slender design of modern destroyers and frigates results in their first-order wet frequency being about a few Hz, which is close to the pulsation frequency of bubbles after explosions in water such as fish and mines, and a strong coupling will be formed between the explosion bubbles and the ship , and cause the ship to respond with an overall whip motion. Under the mid-field explosion, this kind of motion response manifests as coupled elastic resonance; under the near-field explosion, the ship will experience large plastic deformation as a whole, causing the hull plate to tear, buckle, or even break off as a whole, and sink. March 2010 On the 26th, the South Ko...

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Problems solved by technology

[0005] Aiming at at least one defect or improvement requirement of the prior art, the present invention provides a method for predicting the motion response of a ship under underwater explosion considering the damping effect, the purpose of which is to solve the deformation prediction error of the ship structure existing in the existing prediction method big problem

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