CAJ | 학술논문

利用有限元法和边界元方法分析比较了螺旋桨激振力三个方向分力（轴向、横向、垂向）分别作用以及同时作用时引起的船体结构振动与水下辐射噪声。结果表明，船体结构在螺旋桨激振力作用下在轴频、叶频、一倍叶频、二倍叶频以及船体固有频率处振动响应出现线谱；横向螺旋桨激振力引起的船体水下辐射噪声最大，垂向力其次，最小是轴向力；三个方向激振力同时作用时船体最大辐射声功率出现在叶频处，主要由横向力引起，其次是轴频处，主要由轴向力引起。分析其原因主要是横向激振力在叶频时最大，而且与船体固有频率接近，产生共振，轴向力在轴频处次之。
이용유한원법화변계원방법분석비교료라선장격진력삼개방향분력（축향、횡향、수향）분별작용이급동시작용시인기적선체결구진동여수하복사조성。결과표명，선체결구재라선장격진력작용하재축빈、협빈、일배협빈、이배협빈이급선체고유빈솔처진동향응출현선보；횡향라선장격진력인기적선체수하복사조성최대，수향력기차，최소시축향력；삼개방향격진력동시작용시선체최대복사성공솔출현재협빈처，주요유횡향력인기，기차시축빈처，주요유축향력인기。분석기원인주요시횡향격진력재협빈시최대，이차여선체고유빈솔접근，산생공진，축향력재축빈처차지。
The finite element method (FEM) and boundary element method (BEM) are used to calculate the structure vibration and underwater radiated noise of ship structure caused by the propeller excita-tions. It is analyzed and compared that the influence of vibration and underwater radiated noise are caused by three direction forces (shaft, transverse and vertical). The study shows that the vibration response ap-pears line spectrum at axial passing frequency (APF), blade passing frequency (BPF), 2BPF and ship na-ture frequencies. The underwater radiated noise is the biggest excited by the transverse force, then is the vertical force, last is the shaft force. The biggest radiated noise power of ship hull by three forces is mainly excited by transverse force at BPF, then is excited by shaft force at APF. It mainly berceuses that the BPF of transverse force is approach with ship nature frequency.