加筋球壳结构稳定性及其优化研究

BUCKLING AND OPTIMIZATION RESEARCH OF A RIBBED SPHERICAL HULL

采用非弹性理论修正与有限元计算相结合的方法,进行加筋球壳结构的稳定性分析,得到加筋球壳结构的实际失稳压力;并通过改变球壳厚度、加强筋尺寸、加强筋布置形式等讨论球壳厚度、加强形式对加筋球壳结构稳定性的影响;同时考虑加筋球壳结构其他力学性能要求,进行加筋球壳结构的稳定性优化设计,给出加筋球壳结构合理的设计形式。研究表明,球壳厚度、加强形式对加筋球壳结构的稳定性有较大影响,增加球壳厚度、减小加强筋跨距可有效提高其实际失稳压力,改善其稳定性。

Based on combination of non-elastic modification theory and finite element method, buckling analysis of a ribbed spherical bullhead is conducted and the critical buckling pressure is thus obtained. Influence of thickness of spherical hull and influence of reinforcement of stiffeners on buckling of the ribbed spherical hull are discussed by alternating thickenss of spherical hull and reinforcement of stiffeners. Considering other mechanical requirements of spherical bulkhead, buckling optimization is further deployed. Optimal reinforcement form of the ribbed spherical hull is thus presented. Study shows that thickness of spherical hull and forms of reinforcement have significant influence on the critical bulking pressure of spherical ribbed bulkhead. Increasing thickness of spherical hull, reducing distance between stiffeners could increase the critical buckling pressure of the ribbed spherical hull.