Crane Ship Response to Wave Groups
Crane Ship Response to Wave Groups
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DOI：
10.1115/1.2919922
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发表时间：
1991-08
影响因子：
1.6
通讯作者：
T. Schellin;T. Jiang;S. Sharma
中科院分区：
文献类型：
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作者：
T. Schellin;T. Jiang;S. Sharma
研究了斜腿式起重机船在波浪群中起吊重物时的运动响应。9自由度动力学模型包括船体运动、非线性大角度载荷摆动和提升绳索组件的弹性拉伸。水动力响应力和波浪激振力与频率相关，允许非线性系泊系统恢复力。系统平衡状态的线性化结果验证了非线性模拟算法的正确性，并与模型试验结果进行了比较。波群有两种不同的理想化方式：1）作为连续波群，由振幅相等但周期略有不同的拍波对产生; 2）作为孤立波包，由高斯调制振幅谱中的大量规则波分量叠加而成。仿真结果表明，大钩载荷响应主要受一阶波浪激振力的影响，且与船舶运动有很强的耦合关系。由二阶波浪（漂移）力引起的低频水平船舶运动一般不会影响钩载响应，即，一阶和二阶响应是独立的。
The motion response of a shear-leg crane ship lifting a heavy load in wave groups was investigated. The 9-DOF dynamic model incorporated hull motions coupled with nonlinear large-angle load swing and elastic stretch of the hoisting rope assembly. Hydrodynamic response forces and wave excitation forces were taken to be frequency dependent, and nonlinear mooring system restoring forces were allowed for. Closed-form linearized results about the system equilibrium state verified our nonlinear simulation algorithm; simulation results in comparison with scale model test measurements, our mathematical model. Wave groups were idealized in two different ways: 1) as continuous wave groups produced by pairs of beating waves of equal amplitude and slightly different periods, and 2) as isolated wave packets generated by superimposing a large number of regular wave components derived from a Gauss-modulated amplitude spectrum. Simulations show that hook load response, strongly coupled with ship motions, was mainly influenced by first-order wave-exciting forces. Low-frequency horizontal ship motions caused by second-order wave (drift) forces did not generally affect hook load response, i.e., first-order and second-order responses were independent.