激励力作用位置对圆柱壳辐射声功率影响研究

The influence of driving force location on acoustic power radiated from a cylindrical shell

潜艇上的机械设备不平衡运转会产生激励力,不平衡运转设备引起的艇体噪声是辐射噪声的主要成分。因此研究激励力的位置与声功率的关系是非常具有意义。文章建立了环肋圆柱壳结构声振动分析模型,基于力辐射模态从激励力作用位置变化方面对环肋圆柱壳进行数值计算和分析,研究激励力作用在不同位置处时,辐射声功率的变化规律。为了给出激励力作用位置与壳体辐射声功率的关系,运用力辐射模态概念,依据力辐射模态形态特征,分析判断激励力作用位置对辐射声功率的影响,为有效地减少圆柱壳辐射声功率提供了更为方便的技术手段。

The unbalanced operation of mechanical equipment in submarine will produce driving force, and the noise caused by the driving force is an important part of the submarine radiated noise. So it is significant to analyze the rela- tionship between driving force location and radiated acoustic power. This paper builds a ring-stiffed cylindrical shell model for vibration analysis. Based on force radiation modes, the radiated acoustic power is numerically calculated and the variation law of radiated acoustic power is studied when the driving force location changes. For knowing more about the relationship between driving force location and radiated acoustic power, the concept of force radiation mode is adopted, and based on the mode shape the influence of changing driving force location on radiated acoustic power is analyzed From this, a more convenient technical method of effectively reducing the radiated acoustic power is provid- ed.