大型集装箱船振动及噪声数值计算建模方法研究

MODELING METHOD FOR ANALYSIS OF VIBRATION AND CABIN NOISE DISTRIBUTION ON LARGE CONTAINERSHIP

对大型集装箱船中高频域振动及舱室噪声数值计算的建模方法进行了研究。结构超大型化、大舱室、大开口和弱扭转刚度等结构特点导致只能采用统计能量方法进行全船中高频域振动与噪声分析。另外,占总载重量和总容积绝大部分的集装箱的模拟、船舶装载状态等,对全船振动和噪声数值计算结果的影响也是必须考虑的。本文探讨了大型集装箱船统计能量分析模型的建模特点,通过考察子系统模态密度,确定了统计能量方法在集装箱船振动噪声预报中的适用范围。初步揭示了超大型集装箱船舱室振动、空气噪声分布与传播机理,为超大型集装箱船减振与声学设计与提供指导。

The basic theory of statistical energy analysis (SEA) method used for vibration and noise analysis in high frequeney domain is based on the energy transmission between the subsystems of the whole structure. The paper focuses the modeling method mainly on setting up the subsystems and tries to find the relations between the different ways and their results to set up the key subsystems. The feasible domain of SEA for dynamic analysis of container ship is identified by presentation of the modal density of subsystems in SEA model. The computational results show the transmission mechanism of vibration and air-borne noise distribution in cabins and structures and will give a guidance for the acoustic and anti-vibration design of large container ships.