内倾船型的瘫船倾覆特性研究
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摘要
文章采用非线性时域方法进行内倾船型在横浪中横摇运动的数值预报,并在计算中考虑了船体瞬时湿表面变化对水动力的影响。在此基础上,通过对波浪时域历程下船舶的整个倾覆过程进行模拟计算,建立了船舶在瘫船状态下的倾覆概率计算方法。在耐波性水池进行了内倾船型在瘫船状态下的大幅极限运动模型试验,采用模型测试数据对计算结果进行了验证。对内倾船型在波浪中的倾覆特性进行了研究,得到不同海况下的倾覆概率和倾覆前的平均时间,并给出了内倾船型GM的建议取值。
In this research, the roll motion of tumblehome hull is forecasted numerically by a nonlinear time domain method considering hydrodynamic variation caused by the hull instaneous wet surface. The time histories of capsizing motion are simulated at time domain and the method of predicting capsizing probability under dead ship condition is established. Model test of the tumblehome hull for large amplitude motions under dead ship condition is carried out in the seakeeping basin and calculated results are verified by the model test data. The capsizing probability, the mean time before capsizing and the suggested GM value are obtained based on the investigation on the capsizing characteristic of the tumblehome hull.
In this research, the roll motion of tumblehome hull is forecasted numerically by a nonlinear time domain method considering hydrodynamic variation caused by the hull instaneous wet surface. The time histories of capsizing motion are simulated at time domain and the method of predicting capsizing probability under dead ship condition is established. Model test of the tumblehome hull for large amplitude motions under dead ship condition is carried out in the seakeeping basin and calculated results are verified by the model test data. The capsizing probability, the mean time before capsizing and the suggested GM value are obtained based on the investigation on the capsizing characteristic of the tumblehome hull.
引文
[1]张进丰,顾民,魏建强.低干舷隐身船波浪中纵向运动的模型试验及理论研究[J].船舶力学,2009,13(2):169-176.Zhang Jinfeng,Gu Min,Wei Jianqiang.Model testing and theoretic study of the longitudinal motions in waves of low-freeboard stealthy ship[J].Journal of Ship Mechanics,2009,13(2):169-176.
[2]Olivieri A,Francescutto A,Campana E,Stern F.Experimental investigation of parametric roll in regular head waves for the ONR tumblehome[C]//28th Symposium on Naval Hydrodynamics.Pasadena,California,2010.
[3]Hashimoto H.Pure loss of stability of a tumblehome hull in following seas[C]//Proceeding of 19th International Offshore and Polar Engineering Conference.Osaka,Japan,2009.
[4]Hashimoto H,Umeda N,Sogawa Y,Matsuda A.Parametric roll of a tumblehome hull in head seas[C]//Proceeding of 19th International Offshore and Polar Engineering Conference.Osaka,Japan,2009.
[5]Japan.Draft direct assessment on stability under dead ship condition and its numerical validation[S].SLF53/INF.10,Annex7,IMO,2010.
[6]Fonseca N,Soares C G.Time-domain analysis of large-amplitude vertical motions and wave loads[J].Journal of Ship Research,1998(42):139-153.
[7]Fonseca N,Soares C G.Validation of a time-domain strip method to calculate the motions and loads on a fast monohull[J].Applied Ocean Research,2004(26):256-273.
[8]Belenky V,Weems K M,Lin Woei-Min.Numerical procedure for evaluation of capsizing probability with split time method[C]//27th Symposium on Naval Hydrodynamics.Seoul,Korea,2008.
[2]Olivieri A,Francescutto A,Campana E,Stern F.Experimental investigation of parametric roll in regular head waves for the ONR tumblehome[C]//28th Symposium on Naval Hydrodynamics.Pasadena,California,2010.
[3]Hashimoto H.Pure loss of stability of a tumblehome hull in following seas[C]//Proceeding of 19th International Offshore and Polar Engineering Conference.Osaka,Japan,2009.
[4]Hashimoto H,Umeda N,Sogawa Y,Matsuda A.Parametric roll of a tumblehome hull in head seas[C]//Proceeding of 19th International Offshore and Polar Engineering Conference.Osaka,Japan,2009.
[5]Japan.Draft direct assessment on stability under dead ship condition and its numerical validation[S].SLF53/INF.10,Annex7,IMO,2010.
[6]Fonseca N,Soares C G.Time-domain analysis of large-amplitude vertical motions and wave loads[J].Journal of Ship Research,1998(42):139-153.
[7]Fonseca N,Soares C G.Validation of a time-domain strip method to calculate the motions and loads on a fast monohull[J].Applied Ocean Research,2004(26):256-273.
[8]Belenky V,Weems K M,Lin Woei-Min.Numerical procedure for evaluation of capsizing probability with split time method[C]//27th Symposium on Naval Hydrodynamics.Seoul,Korea,2008.