声介质中水弹性力学消除不规则频率的方法  

Method to eliminate irregular frequencies in threedimensional hydroelasticity in acoustic medium

作　　者：邹明松[1] 吴有生[1] 祁立波[1] 周金华[2] 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]上海交通大学船舶海洋与建筑工程学院,上海200030

出　　处：《船舶力学》2013年第10期1202-1208,共7页Journal of Ship Mechanics

摘　　要：文章根据简单源方法(源汇分布法)中不规则频率的产生机理,在内部流场中引入一个虚拟阻抗封闭曲面用于吸收声振能量,消除内部流场的共振现象,以此消除不规则频率。将该方法与现有的水弹性力学简单源求解方法相结合,应用声介质中水弹性力学计算程序THAFTS求解了一球形浮体涨缩振动和刚体平动的声阻抗,通过与解析结果的比较,验证了文中所述的方法能较好地消除不规则频率。同时进一步计算分析了内部虚拟阻抗曲面的大小以及曲面上声阻抗的大小对消除不规则频率效果的影响,为该方法的实际应用提供了理论指导。An imaginary closed impedance-surface was introduced into the ＂inner fluid domain＂ to absorb oscillatory energy according to the mechanism of causing irregular frequencies in simple-source formula tion, and that the resonance phenomena and irregular frequencies were eliminated simultaneously. Combin ing this method with simple-source formulation, the acoustic impedances of breathing vibration and rigid translation of one sphere were computed by using 3-D hydroelasticity programme THAFTS. The validity of this method to eliminate irregular frequencies was checked by comparing with analytic results. It was anal ysed that the influence of the size and the impedance value of the imaginary impedance-surface to elimi nat irregular frequencies, and these work will provide theoretical direction for practical applications of this method.

关 键 词：水弹性力学 声介质 不规则频率 球壳 

分 类 号：O342[理学—固体力学]