基于统计能量分析法的船艇机舱噪声建模计算

根据统计能量分析法的原理，结合某型军用船艇机舱实际结构建立了机舱的物理及数学模型。运用表面速度振动测量法确定了发动机的输入声功率，采用理论及经验公式讨论了统计能量分析法其它参数确定。将机舱噪声预测值与实验值进行了对比分析，结果表明，预测机舱总声压级为93.8 dB(A)，比实测结果低2.9 dB(A)．在315 Hz以上主要频段上，最大误差在4 dB(A)以内，最小达到0.3 dB(A)．预测曲线与实测曲线吻合较好。

Calculation Research on Ship Engine Compartment Noise Modelling Based on Statistical Energy Analysis Method

An efficient method was presented for the prediction of structure-borne sound transmission in ship engine compartment structures. Statistical energy analysis (SEA) was used, and the equations of subsystems were also presented. In the method developed, the input power from engine surface ra?diated noise measurement was evaluated to acmeve precise data. The theoretical formula was used to estimate the parameters of SEA. The effectiveness of the present method was illustrated by the com?parison between the predictive value and the actual measurement. The comparison result shows that the calculation value of engine compartment noise level is 93.8 dB(A), which is lower than the test value by 2.9 dB(A) ; the maximum error is 4 dB(A), the minimum is 0.3 dB(A) at main frequency band of 315 Hz; the predictive curve accords with the actual.