基于弹性微元的拖曳系统动力学研究
Study on the Dynamics of Towed Systems Based on Elastic Elements
孔祥晖 1吴家鸣 1张天1
作者信息
- 1. 华南理工大学 土木与交通学院,广东 广州 510640
- 折叠
摘要
针对水下拖曳系统的水动力特性分析问题,提出一种全新的数值求解平台.该平台将求解过程分为拖缆和拖曳体两部分.通过增加微元内部阻尼,提升拖缆求解过程的瞬态计算稳定性,然后用力耦合方法将两部分耦合.与现有试验结果进行对比,验证本平台的有效性,分析拖曳速度、拖缆长度及海流扰动多种因素影响下的系统响应情况.结果表明,拖曳速度增加会减小拖曳体的沉深;拖缆长度增加在增大拖曳体深沉的同时会影响拖曳体纵倾角度的变化;相较于定常来流,在频率为1.57 的非定常海流条件下,拖曳体的平均沉深减小 0.07～0.11 m、周期性变化幅值为0.1～0.17 m,平均倾角减小0.4°～1.2°、倾角变化幅值为 7.8°～9.8°,表明海流对拖曳体维持深度和姿态稳定带来不利影响.该方法可应用于拖曳系统的初步设计阶段,并且在计算合理性、计算速度与计算精度之间能够取得较好的综合平衡.
Abstract
Aiming at the problem of hydrodynamic characterization of underwater towing system,a new numerical solution platform is proposed.The platform divides the solution process into two parts:cable and towing body.The transient computational stability of the towing cable solution process is improved by increasing the internal damping of the microelement,and then the two parts are coupled by the force coupling method.Comparison with the existing experimental results is made to verify the effectiveness of this platform.Accordingly,the response of the system under the influence of multiple factors,such as towing speed,towing cable length and current disturbance,is analyzed.The results show that the increase of towing speed decreases the towing body's depth of immersion;the increase of towing cable length increases the towing body's depth of immersion and affects the change of the longitudinal inclination angle of the towing body.The average depth of the towed body decreased by 0.07～0.11 m,with a cyclic variation of 0.1～0.17 m,and the average inclination decreased by 0.4°～1.2°,with an inclination variation of 7.8°～9.8°,suggesting that currents adversely affected the maintenance of the towed body's depth and attitude stability.The method can be applied to the preliminary design stage of the towing system,and can achieve a good balance between the rationality,speed and accuracy of the calculation.
关键词
水下拖曳系统/计算流体力学/弹性微元/水动力特性Key words
Underwater towing systems/Computational fluid dynamics/Elastic microelements/Hydrodynamic properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据