CAJ | 학술논문

针对散射实验缩比模型的设计问题,研究了壳体结构的声散射相似性.根据弹性声散射理论,研究了一般情况下壳体结构的声学相似性,同时对有厚度畸变的情况进行了分析.采用材料补偿法来弥补厚度畸变引起的弹性散射特性变化,利用最优控制理论得到厚度畸变模型的最佳壳厚比.研究结果表明,对于球壳和圆柱壳内部真空或内部充水,在频率较低时认为铝壳体近似是钢壳体厚度的2.7倍时两者的形态函数吻合情况最好,声学特性也最相近,并且频率越低其相似性越好.
침대산사실험축비모형적설계문제,연구료각체결구적성산사상사성.근거탄성성산사이론,연구료일반정황하각체결구적성학상사성,동시대유후도기변적정황진행료분석.채용재료보상법래미보후도기변인기적탄성산사특성변화,이용최우공제이론득도후도기변모형적최가각후비.연구결과표명,대우구각화원주각내부진공혹내부충수,재빈솔교저시인위려각체근사시강각체후도적2.7배시량자적형태함수문합정황최호,성학특성야최상근,병차빈솔월저기상사성월호.
The acoustic scattering properties of shell structures were studied so that the behavior of scale models used in scattering experiments can better mimic actual materials. The acoustic properties of the shell structures in normal situations were studied according to the elastic scattering theory of sound. At the same time, the extent of distortions caused by thickness was analyzed. Material use must compensate for distortions caused by differing properties with changes to thickness; changes must match for echo or elastic scattering properties. Based on optimum theory, the optimum thickness ratio can be determined, such that it can satisfy acoustically similar conditions. Based on optimization control, it was concluded that when the thickness of aluminum is 2.7 times of that of steel, a form made of aluminum behaves acoustically as would one of steel, that is to say, their acoustic characteristics agree well. It was found that the lower the frequency, the more closely aluminum can mimic steel.