基于VA One船舶舱室动力设备空气噪声控制分析

目的研究舱室间壁板不同约束条件及不同敷设方式对隔声量的影响。方法用VA One建立两个舱室的统计能量分析(Statistical Energy Analysis,SEA)模型,对约束阻尼结构和自由阻尼结构的隔声性能进行分析。针对约束阻尼结构,讨论其两侧金属层厚度差对整个壁板的隔声性能的影响;对自由阻尼结构,分析金属层与阻尼层之间的相对位置对其隔声性能影响。结果约束阻尼结构隔声量A计权声压级比自由阻尼结构高。结论阻尼层厚度和壁板总厚度一定时,自由阻尼结构金属层与阻尼层之间的相对位置对实际的隔声性能并没有影响;约束阻尼结构,两侧金属层等厚敷设时,其隔声效果最优,且两侧厚度差越大隔声量越小。

Airborne Sound Control of Power Plant for Ship Cabin Based on VA One

Objective To study the effects of different constraints and different laying methods on the acoustic volume of compartment interval. Methods The Statistical Energy Analysis (SEA) model of two cabins was established by VA One to analyze the acoustic insulation performance of restrained and free damping structures. The influence of the thickness difference of both sides of metal layer on the sound insulation performance of the whole wall plate was discussed. For free damping structure, the effect of the relative position between metal layer and damping layer on its sound insulation performance was analyzed. Results The Type A acoustic meter right sound pressure level of restrained damping structure was higher than that of free damping structure. Conclusion When the thickness of the damping layer and the total thickness of the wall plate are constant, the relative position between the metal layer and the damping layer of the free damping structure has no effect on the actual sound insulation performance. When the thickness of metal layer on both sides of the structure is equal, the sound insulation effect is optimal. The larger the thickness difference is, the smaller the sound insulation quantity is.