摘要
研究简谐点力激振下含层间水的双层加筋板结构层间声振传递特性,利用声压波动方程和位移连续条件来解层间流场,并将计及质量惯性效应的加筋板对面板的横力、弯矩和扭矩引入双板振动方程,最终建立双板声—流体—结构耦合方程;应用傅里叶积分变换法以及数值截断求解方程,并结合稳相法推导得到远场辐射声压表达式。将计算结果与已有公开数据进行对比,验证方法的有效性;然后详细讨论传递模式、激振位置以及加筋参数对声学特性的影响,结果表明:当点力作用在强筋结构上,声振传递特性主要由加筋板主导,并有阻抗抑振作用;当点力作用在面板上,层间水也是重要的声学传递通道,内外水与加筋板的双通道传递模式在中高频具有同相叠加作用,辐射声压显著增大;加筋参数对振声传递特性具有重要影响,间距增大,振动传递由加筋板转为层间水主导;加筋板厚度的影响与具体激振位置有关。
The sound and vibration transmission characteristics of double reinforced plates with inner water were studied.The fluid field was solved by applying Helmholtz equation and the continuity conditions between the fluid and structure.The coupled vibration equation was constituted and solved by employing the Fourier transform technique and truncation method considering the tensional,bending and torsional movements of the orthogonal stiffeners.At last,the expression of far field pressure was given based on the static phase method.The proposed method was validated by comparing with the existing results,and numerical calculations were subsequently carried out to explore the parametric influence on the sound pressure and transverse displacement spectra.The results show that the vibration transmission is dominated by the rib-stiffened plate where the load is applied,and the effect of vibration suppression is observed due to the large impedance of stiffeners.When the load acts on the panel,the inner water is also an important transmission channel,and the double channel transmission paths exaggerate the sound pressure in the medium-high frequency.The rib parameters have a great impact on the transmission characteristics.The transmission channel is dominated by the inner fluid,with the large spacing and the effect of the stiffeners thickness is related to the force location.
作者
杨智雄
殷学文
吴文伟
王纬波
YANG Zhi-xiong;YIN Xue-wen;WU Wen-wei;WANG Wei-bo(National Key Laboratory on Ship Vibration&Noise,China Ship Scientific Research Center,Wuxi 214082,China)
出处
《船舶力学》
EI
CSCD
北大核心
2022年第3期437-447,共11页
Journal of Ship Mechanics
基金
国防科技重点实验室基金一般项目(6142204200603)。
关键词
双层加筋板
层间水
声振传递
傅里叶积分变换
位移波谱
辐射声压
double reinforced plates
inner water
sound and vibration transmission characteristics
Fourier transform method
transverse displacement spectrum
far-field pressure
