基于原型测量的极地航行船舶船体冰载荷分析

Ice-induced load analysis for hull of an ice-going vessel based on full-scale measurement

船体与海冰碰撞引起的冰载荷一直是破冰船领域研究的重点。根据S.A.AgulhasⅡ号极地科考补给船在南极海域的原型测量数据,利用影响系数矩阵法和反演法对船体艉肩部的冰载荷进行分析。通过肋骨上不同应变传感器测得的剪应变,在MATLAB中利用系数矩阵转换,得到了不同肋骨上的冰载荷。通过建立艉肩部有限元模型,采用两种不同的离散方式对载荷区域进行离散,并利用Tikhonov正则化求解反演方程,得到外板的冰载荷分布。克服了数据处理过程中解的不适定性,使得两种方法得到的计算结果也极为相近。

The ice-induced load on a ship hull is a key point in the study field of icebreaker. Based on the full- scale measurement data here, the influence coefficient matrix method and the inverse method were applied to analyze the ice load on the stem shoulder area of the polar supply and research vessel S. A. Agulhas II. The ice loads on different frames were therefore obtained by transforming the shear strain data measured with sensors attached on those frames and using the coefficient matrix in MATLAB. To get the ice load distribution, the finite element model in the stem shoulder area was built and two different discretization methods were used to discrete the load area. Tikhonov regularization was employed to solve the inverse equation, the ice load distribution on the outside plate was gained. The results showed that the two methods proposed can lead to similar solutions and overcome the ill-posed nature of solutions during data processing.