CAJ | 학술논문

水下吸声覆盖层对潜艇的隐身具有重要的意义,因此得到了广泛的关注.本文对含有玻璃微球的黏弹性复合材料覆盖层的水下吸声性能进行了理论分析.采用等效参数法计算了玻璃微球的体积含量对复合材料的力学和声学性能的影响.应用声波在多层介质中传播的一维模型,计算了不同玻璃微球体积含量的单层复合材料覆盖层的吸声性能.结果表明,增加玻璃微球的体积含量可以提高覆盖层的低频吸声性能,但是其高频吸声性能降低.采用遗传算法对玻璃微球在覆盖层厚度方向上的体积含量分布进行优化.优化的多层结构可以在一定的频带内改善覆盖层的表面与水的声阻抗匹配,在保证覆盖层的高频吸声系数大于某一限值(0.7)的前提下,提高其低频吸声性能.另外,多层优化结构覆盖层不含宏观的空腔结构,不影响覆盖层的耐压性能.其结构简单,对制备工艺的要求不高.因此,本文形成的理论方法适用于水下吸声覆盖层的设计.
수하흡성복개층대잠정적은신구유중요적의의,인차득도료엄범적관주.본문대함유파리미구적점탄성복합재료복개층적수하흡성성능진행료이론분석.채용등효삼수법계산료파리미구적체적함량대복합재료적역학화성학성능적영향.응용성파재다층개질중전파적일유모형,계산료불동파리미구체적함량적단층복합재료복개층적흡성성능.결과표명,증가파리미구적체적함량가이제고복개층적저빈흡성성능,단시기고빈흡성성능강저.채용유전산법대파리미구재복개층후도방향상적체적함량분포진행우화.우화적다층결구가이재일정적빈대내개선복개층적표면여수적성조항필배,재보증복개층적고빈흡성계수대우모일한치(0.7)적전제하,제고기저빈흡성성능.령외,다층우화결구복개층불함굉관적공강결구,불영향복개층적내압성능.기결구간단,대제비공예적요구불고.인차,본문형성적이론방법괄용우수하흡성복개층적설계.
@@@@Underwater sound absorption coating is significant to the stealth of a submarine, so it attracts a lot of attention. Underwater sound absorption of visco-elastic composites coating containing micro-spherical glass shell was investigated theoretically. The mechanical and acoustic properties of the composites in response to the volume of the micro-spherical glass shell were analyzed by the effective parameters method. Sound absorption of a single layer composites coating containing different volume of micro-spherical glass shell was calculated by the one-dimensional model, in which sound propagates in multi-layer media. The calculated results show that the sound absorption at low frequencies can be promoted by increasing the volume of micro-spherical glass shell, but the sound absorption at high frequencies is depressed. The volume distribution of the micro-spherical glass shells across the thickness of the coating was optimized by the genetic algorithm. The optimal multi-layer structure can promote the sound absorption at low frequencies, and keep the sound absorption coefficients above a limited value (0.7) at high frequencies. The optimal multi-layer composite coating can work at high pressure since it does not contain hollow macro-structure. Its structure is simple, so the technique of its fabrication should not be complicated. The theoretical method achieved in this paper can be applied in the design of underwater sound absorption coating.