基于闭环计算的船舶舱室空气噪声工程预报

Prediction of Airborne Cabin Noise Based on Closed Loop Computation

舱室空气噪声快速预报对船舶早期声学设计有着重要作用。在传统"S-P-R"系统分析预报方法的基础上,引入"声学单元"的概念,考虑舱室间噪声能量的耦合关系,将"开环"计算转化为"闭环"计算,提高了计算精度。该预报方法被应用到某大型油轮的噪声预报中,其计算结果与SEA软件比较可见,"闭环S-P-R"能有效克服"开环S-P-R"在大型复杂船舶结构舱室空气噪声预报的不足。

Fast airborne cabin noise prediction is of great importance to early acoustic design for ships.Based on traditional"S-P-R"approach,a closed loop computation instead of open loop method is put forward by employing acoustic elements and considering coupling energy transmission of the cabins.This method improves the accuracy of prediction.This method is applied to the cabin noise prediction of a large oil tanker and the results are compared with those from SEA computation.It is seen that this method can overcome the shortage of open loop computation and has high accuracy of prediction.