船舶结构振动衰减快速预报（英文）

Engineering Prediction on Vibration Reduction in Typical Ship Structures

文章研究了典型船舶结构中加筋板的结构声传递规律,应用波分析法推导了加筋板多转角结构中的位移及能量传递表达式。此外,还应用有限元法分析了各种参数的影响,包括板厚、板长、板厚比、转角级数、加筋情况和转角形式。从计算结果可知,在船舶结构中,板厚和转角级数是影响振动衰减的重要因素,板长、转角形式板厚比和加筋情况也对其有一定的影响。转角角度的影响可以忽略。基于以上分析,文中提出了一个船舶结构振动衰减量预报公式,并对一缩尺船舶舱段模型进行了试验,从而验证了公式的有效性。这在船舶声学设计中对振动进行快速预报具有重要意义。

Structure-borne sound attenuation in typical ship structure consisting of stiffeners rein-forced plates is studied. Displacement field and vibration energy transmission in reinforced multi-cor-ner structure are deduced by wave approach. And the influences of parameters including thickness, length, thickness ratio, junction order, density of stiffeners and junction forms on vibration reduction are investigated through numerical computation. It can be obtained from the computational results that plate thickness and junction order are the main factors influencing the vibration reduction. Plate length, junction forms, thickness ratio and stiffeners should also be taken into consideration in the prediction process, while junction angle can be ignored. Then, an engineering formula for vibration reduction prediction in ship structure is put forward based on parameter analysis, which is also vali-dated through the experiment on a scaled model simulating a hold section of a ship. This will be helpful for fast vibration reduction prediction during the acoustic design of ships.