载流弹性薄板结构吸声性能的研究

Study of thin panel with fluid loaded absorbers

对弹性薄板吸声结构在水下的吸声性能进行了研究,推导了载流弹性薄板结构声阻抗的解析解。提出并计算了薄板结构的势能因子B_(nm)、动能因子A_(nm)和载流因子系数χ。得出薄板结构吸声性能严格的解析理论和幂级数近似表达式,本文获得的结果使薄板理论的吸声机理更加清晰,计算也更加简化。通过低频水声管对薄板结构进行了测试,测试结果和理论计算结果吻合得较好,验证了本文理论的正确性。

The absorption of thin panel with fluid loaded absorbers was investigated. The general theory and approximate theory of thin panel absorbers were given; parameters of potential energy, parameters of kinetic energy and parameters of fluid loaded were proposed and calculated, which made absorption mechanism more clear and computation more simple than before. The coefficients of absorption and impedances of thin panel absorbers were obtained in use of transfer function method acoustical tube which agreed with the theoretical results very well.