Noise Prediction of Large Ship 6700PCTC Using EFEA-SEA Hybrid Technique

In ship building industry, it has always been a big challenge to perform the global vessel noise prediction. Currently statistical energy analysis (SEA) is mostly used for noise prediction in industry, while some others have used energy finite element analysis (EFEA) for structure-borne noise calculation. It's desirable for engineers to apply the EFEA to calculate the structure-borne noise and SEA to analyze the airborne noise simultaneously. Both EFEA and SEA can be coupled in the software ViNAS. Based on such vibroacoustics computation software, a study of global noise prediction of large ship 6700PCTC (6700 pure car/truck carrier) was performed. The computation directly utilized the FEM model which was served for strength and vibration analysis. The properties of noise control treatment were attached to the plates surrounding treated cavities. The vibroacoustic responses of all cavities and plate elements were predicted. Verification data was measured on the ship and compared to the predictions. Unlike SEA, the EFEA doesn't need to make significant changes to FEM model to rebuild its own model. Therefore, this paper demonstrates that the EFEA-SEA hybrid technique has great engineering benefits to global vessel noise analysis.