CAJ | 학술논문

研究了具有矩形月池的钻井船在小幅水平横荡简谐运动激励下的辐射问题。利用简化的底部边界条件，基于线性势流理论建立了钻井船月池二维流体运动方程，利用 Galerkin 方法求得月池内流体速度势，得到月池对船舶的附加质量表达式。利用半解析解，研究了月池的水动力特性及月池参数对船舶水动力参数的影响。以边界元方法建立具有矩形月池结构的钻井船数值模型，数值模拟结果与半解析解进行对比验证。结果表明，在激励频率穿过月池内流体的固有振动频率时，附加质量会依次出现正、负峰值；自由液面及月池底部无量纲速度分布受激励频率及月池无量纲水深的影响较明显；在不同无量纲水深下，半解析解与数值模拟结果吻合较好。
연구료구유구형월지적찬정선재소폭수평횡탕간해운동격려하적복사문제。이용간화적저부변계조건，기우선성세류이론건립료찬정선월지이유류체운동방정，이용 Galerkin 방법구득월지내류체속도세，득도월지대선박적부가질량표체식。이용반해석해，연구료월지적수동력특성급월지삼수대선박수동력삼수적영향。이변계원방법건립구유구형월지결구적찬정선수치모형，수치모의결과여반해석해진행대비험증。결과표명，재격려빈솔천과월지내류체적고유진동빈솔시，부가질량회의차출현정、부봉치；자유액면급월지저부무량강속도분포수격려빈솔급월지무량강수심적영향교명현；재불동무량강수심하，반해석해여수치모의결과문합교호。
A study was carried out on radiation problem of a drilling unit with a rectangular moonpool under low am-plitude horizontal harmonic excitation. The two-dimensional governing equations of the fluid in the moonpool were established based on linear potential theory. The simplified boundary condition was adopted. The fluid velocity poten-tial and the added mass expression of the moonpool was solved by the Galerkin method. The hydrodynamic character-istics of the moonpool were studied and the effect of the moonpool parameters on the drilling unit was revealed. A numerical model of a drilling unit with a rectangular moonpool was built by boundary element method. The results of two methods were compared to verify the semi-analytical solution. The results show that the added mass presents posi-tive and negative peaks when the excitation frequency passes through the natural frequency of the moonpool;the free surface shape and nondimensional velocity distribution are significantly affected by the excitation frequency and the non-dimensional draught of moonpool; the semi-analytical solution fits the numerical result well for different non-dimensional draughts of moonpool.