Research on influence of fluid-structure coupling and acoustic-structure coupling on prediction of ship underwater noise
Based on acoustic boundary element method the low-frequency underwater radiated noise of a feeder con-tainer ship is predicted and studied,comparing the influence of fluid-structure coupling and acoustics-structure coupling on prediction of ship underwater radiated noise.Taking the spectral level and 1/3 octave band level of field points'sound pres-sure and radiated sound power as the assessment quantities,the following conclusions are obtained by comparing the predic-tion results.The results of two coupling methods have a similar trend.The compressibility of seawater is ignored and the damping effect caused by seawater compression has not been considered in fluid-structure coupling method,thus its results are almost greater than those of acoustic-structure coupling method.In the practical engineering application of ship underwa-ter radiated noise prediction,the coupling method can be freely selected according to the actual situation as the errors of two coupling methods are less than the engineering accuracy requirements(3 dB)when the frequency is low.When the fre-quency is high,acoustic-structure coupling method is recommended as the result of fluid-structure coupling method may be high and its results are too conservative.
acoustic boundary element methodfluid-structure couplingacoustic-structure couplingunderwater radiated noise
NETL
NSTL
万方数据
