基于量纲分析的柔性立管骨架层辊弯成型弯曲变形特征预测

Prediction of bending deformation characteristics of flexible tubular carcass layer roll bending with dimensional analysis

柔性立管是海洋油气开发的关键输运装备,骨架层是其最内层结构,由扁平的钢板经过多道次辊弯和缠绕锁扣2道成型工艺加工制成。由于骨架层结构特征复杂,几何参数繁多,且钢板在成型过程中存在纵向及横向变形,导致辊弯成型过程中关键加工参数对其变形特征影响尚不清晰。基于量纲分析原理,建立了多道次辊弯关键加工参数与骨架层变形特征(弯曲角度)关系的量纲表达式,并且采用多项式回归和符号回归方法分别获得了量纲表达式展开形式,明确加工参数(弹性模量、钢板厚度、辊轮半径、辊轮间距)对骨架层弯曲角度的影响,结论显示钢板厚度对弯曲角度影响较大,当厚度从1 mm增大至2 mm时,弯曲角度下降了27.74%。

Flexible riser is a critical transportation device for offshore oil and gas development,and its innermost structure is the carcass layer,which is built from flat steel plates through multiple passes of roll bending and winding lock forming processes.Due to the complex structural characteristics and numerous geometric parameters of the carcass layer,as well as the longitudinal and transverse deformations of the steel plate during forming process,the influence of key processing parameters on its deformation characteristics during roll bending shaping is not clear.In this paper,based on dimensional analysis principles,dimensionless expressions for the relationship between key processing parameters and the deformation characteristics(bending angle)of the carcass layer in multi-pass roll bending are established.Using polynomial regression and symbolic regression methods,the expanded forms of dimensionless expressions are obtained to clarify the effects of processing parameters(elastic modulus,steel plate thickness,roller radius,roller spacing)on the bending angle of the carcass layer.Conclusion shows that the steel plate thickness has a significant impact on the bending angle and that when the thickness increases from 1 mm to 2 mm,the bending angle decreases by 27.74%.