| Citation: | XIN Tengda, WANG Hua, CUI Cunyan, et al. Reliability evaluation of tank under uncertain conditions based on interval convex model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(11): 2380-2387. doi: 10.13700/j.bh.1001-5965.2018.0098(in Chinese)
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Aimed at the reliability evaluation problem of liquid propellant tank under uncertain conditions, the reliability evaluation method of tank stress strength is established based on tank stress strength and interval convex model theory. Firstly, the stress distribution of propellant tank is analyzed and derived based on the liquid propellant tank mathematical model, and the equivalent stress is confirmed through combining with the stress strength theory. Secondly, based on the stress strength interference theory and the area ratio of regularized interval theory, the interval convex model reliability index of tank stress strength is defined. Finally, combined with the actual parameters of a certain type rocket propellant tank, the method is verified through transforming the equivalent stress and critical stress into interval convex set form, and then it is compared with the reliability index results of ellipsoid convex model. The results show that the stress intensity interval convex model reliability index can evaluate the tank's entirely reliable states accurately, and can quantize the reliability degree of tank's non-entirely reliable states into the interval of [0, 1].
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