Numerical simulation and improvement design of air cushion skirt connecting structure

1 State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 2 Marine Design and Research Institute of China, Shanghai 200011, China Abstract: ［Objectives］The design of air cushion skirt connection structures mostly uses empirical formulas, and the application of the numerical simulation method is rare. Aiming at the particularity of the connection structure, a method for constructing a 3D finite element model of a connector which considers the bolt connection, complex contact of multiple components and interaction between the skirt and metal members is proposed as an effective means of designing skirt connection structures.［Methods］Taking the skirt connection structure in the bow of a air cushion vehicle as an example, a refined model of the structure is constructed, and the lifting load and extreme conditions are obtained from the static uplift forming results of a air cushion vehicle. The stress distribution of each member under lifting conditions and extreme conditions is then obtained for the air cushion skirt under loading, and suggestions for improving the main components are put forward.［Results ］ The results show that the upper edge of the hull plate's bolt hole, end of the pin shaft and transition part of the hinge are the main high-stress areas. The proposed schemes for local thickening and closed buckle improvement reduce the maximum average stress of the skirt hinge by over 20%, proving that the proposed structural improvement recommendations, especially the closed buckle design, can effectively improve the bearing capacity of the hinge.［Conclusions］ The numerical simulation proposals in this study can be used to effectively calculate and analyze the strength of connection structures, and the improved scheme can provide design support. Key words: air cushion skirt；bolted connection structure；refined model；skirt hinge；design improvement

收稿日期: 2020–08–04 修回日期: 2020–10–18 网络首发时间: 2021–04–25 09:42基金项目:国家重点研发计划资助项目（2018YFC1406000）作者简介:王露寒，男，1996 年生，硕士生。研究方向：气垫船设计与研究。E-mail：luhanwang@sjtu.edu.cn唐文勇，男，1970年生，博士，教授。研究方向：船舶与海洋结构物载荷分析及结构安全性评估。E-mail：wytang@sjtu.edu.cn徐圣杰，男，1988年生，博士生，工程师袁昱超，男，1991年生，博士，助理研究员。研究方向：船海结构物响应分析及减振降噪技术研究。E-mail：godyyc@sjtu.edu.cn *通信作者:唐文勇