Radiation noise prediction method for naval vessel vibration shell

Abstract

The invention discloses a radiation noise prediction method for a naval vessel vibration shell, and the method comprises the steps of collecting a vibration signal of the naval vessel vibration shell; performing time integration on the two tangential acceleration signals and the normal acceleration signal to obtain two tangential speed signals and a normal speed signal; building a naval vessel vibration shell radiation noise prediction model based on sound wave speed and sound pressure control equation space discretization and time integration, wherein sound field variables comprise sound pressure p (x, t), sound wave tangential speed utau '(x, t) and utau' '(x, t) and sound wave normal speed un (x, t), and x represents different positions of a sound radiation field; for sound field variables, constructing a non-reflection prediction model of PML by adopting a DRP spatial discrete format and an LDDRK time integral format; adding a tangential speed variable and a normal speed variable into the model to calculate the change condition of the sound field along with time under the condition of shell vibration; and calculating the influence of the motion of the naval vessel vibration shell on the sound field variable at each time step so as to predict the sound radiation of the naval vessel vibration shell at each moment.

Description

technical field [0001] The invention relates to the technical field of acoustic simulation, in particular to a method for predicting radiation noise of a ship vibrating shell. Background technique [0002] Ship stealth performance is a key feature of ship survivability and combat effectiveness, and it is also a key technology for countries to enhance their maritime military deterrence. However, in the vast ocean water medium, the sound field is the only physical field that can transmit information over long distances. Therefore, underwater radiated noise of ships is the core index of their stealth performance. In order to reduce the underwater radiated noise level of warships, the size of this indicator is often tested in the design stage by the method of scaled trial production. However, the scale-down trial production method not only consumes a lot of manpower and material resources, but also is affected by the scale effect and the experimental environment. Due to the a...

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Problems solved by technology

However, the accuracy of the traditional noise prediction method is not high, and it is easily affected by the boundary effect, so it cannot accurately and effectively analyze the radiated noise of the vibrating shell

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