ABSTRACT

It is desirable for naval architectures to simultaneously bear high force and dissipate dynamic energy. A structural protection approach via a specifically designed all-metal stiffened member with bistable components is proposed, which not only exhibits high stiffness but also an order of magnitude increase in the structural damping compared to that of a traditional member under wave impact. As a typical module, a two-degree-of-freedom model of the Euler beam stiffened by bistable component is derived and characterized as a double-well potential, and the theoretical analysis indicates that a unique combination of this coupled bistable-linear (CBL) module’s natural vibration and the bistable components’ higher frequency oscillation caused by the potential barrier highly enhances the structural damping. The CBL modules are utilized to stiffen a representative grille structure, which effectively mitigates the slamming response within the elastic range in FEM.

摘要

海军建筑希望同时承受高强度和耗散动态能量。提出了一种通过专门设计的具有双稳态部件的全金属加劲构件的结构保护方法，与波浪冲击下的传统构件相比，该方法不仅具有高刚度，而且结构阻尼也提高了一个数量级。作为典型模块，推导了双稳态构件加筋的欧拉梁的二自由度模型，并将其表征为双阱势，理论分析表明这种耦合双稳态线性（CBL）的独特组合) 模块的固有振动和势垒引起的双稳态元件的高频振荡极大地增强了结构阻尼。