Research on Prediction of Middle-frequency Ship Cabin Noise Based on Improved Statistical Energy Method

Abstract

The ship vibration and noise calculation in middle-frequency region has always been a difficult point in engineering. The statistical energy method assumes that the coupling between structures is weakly coupled, which in turn limits its application in the calculation of ship’s middle frequency vibration and noise. In order to improve the vibration and noise calculation accuracy of statistical energy method in middle-frequency region, the equivalent coupling loss factors (ECLFs) between ship sub-structures were calculated based on the energy flow method (EFM), and the ECLFs were substituted into the statistics energy balance equation. The ship’s middle frequency cabin noise was calculated by the improved statistical energy method and compared with the measured values. The results show that the predicted values of the cabin noise are in good agreement with the measured values, which extends the application of the statistical energy method in the ship’s middle frequency cabin noise prediction.