基于多失效模式的水下航行器耐压壳体结构可靠性研究

STUDY ON RELIABILITY OF THE CYLINDRICAL PRESSURE HULL WITH MULTIPLE FAILURE MODES CORRELATED FOR UNDERWATER VEHICLES

耐压壳体结构是水下航行器重要的组成部分,考虑到结构强度和稳定性失效之间的相关性以及结构参数存在的随机性,基于可靠性理论开展多耦合失效模式下的耐压壳体结构性能分析研究。在研究过程中,首先基于二阶响应面法对耐压壳体结构的力学模型进行简化分析,获得相应的结构力学数学模型;其次在综合考虑结构参数随机性基础上,结合随机摄动法、二阶矩方法和窄界限法,建立水下航行器耐压壳体结构多失效模式可靠性分析模型;最后在分析计算各结构参数灵敏度基础上,获得结构参数对耐压壳体结构性能的影响规律。通过研究清楚地了解各因素对耐压壳体结构性能的影响程度,为结构设计提供一定的理论参考。

The pressure hull is an important part of underwater vehicle, considering the correlation between the structure Strength failure and stability failure, the randomness of the structure parameters, based on the reliability theory, the analysis of performance of the pressure hull structure with multi-coupling failure modes are carried out. In the research process, firstly, based on the second-order response surface method, the mechanical model of the pressure hull structure was simplified and analyzed. Secondly, considered the randomness of the structural parameters, and combined with random perturbation method, second-order moment method and Ditlevsen narrow bound method, the reliability analysis model of the pressure hull structure multi-failure modes of the underwater vehicle was established. Eventually, based on the structure parameter sensitivity analysis, the influence of structural parameters on the performance of pressure shell structure was obtained. Through this study, the designers can clearly understand the influence degree of geometry parameters for pressure hull performance, which can provide reference for the structural design of cylindrical pressure hull.