| Citation: | XIN Tengda, ZHAO Jiguang, CUI Cunyan, et al. Interval interference time-variant reliability analysis method for propellant tank[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(4): 739-745. doi: 10.13700/j.bh.1001-5965.2019.0294(in Chinese)
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During the service period of propellant tank, due to the existence of uncertain factors such as structural strength degradation and external random loads, the reliability of propellant tank is with time-variant characteristic. Based on interval theory and stress-strength interference theory, an interval interference time-variant reliability analysis method is proposed for the time-variant reliability analysis of propellant tank. By analyzing the stress of the cylindrical tank with ellipsoid bottom, the stress and strength are converted into the form of time-varying interval variables according to the equivalent stress distribution and strength power exponential degradation model. Combined with the stress-strength interference theory, the stress and strength intervals at any time are converted into the standardized interval. According to the position relation between the critical state function and the standardized interval, the interval interference time-variant reliability index is defined. Finally, the time-variant reliability of tank is analyzed with the sample parameters, and the validity of the proposed method is verified by comparing with the stress-strength interference reliability that obeys normal distribution and the interval reliability analysis results.
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