北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (4): 739-745.doi: 10.13700/j.bh.1001-5965.2019.0294

• 论文 • 上一篇    下一篇

推进剂贮箱区间干涉时变可靠性分析方法

辛腾达1, 赵继广2, 崔村燕3, 段永胜3   

  1. 1. 航天工程大学 研究生院, 北京 101416;
    2. 航天工程大学 电子与光学工程系, 北京 101416;
    3. 航天工程大学 宇航科学与技术系, 北京 101416
  • 收稿日期:2019-06-10 发布日期:2020-04-21
  • 通讯作者: 崔村燕 E-mail:13661315668@126.com
  • 作者简介:辛腾达,男,博士研究生。主要研究方向:飞行器测试与发射;赵继广,男,博士,教授,博士生导师。主要研究方向:航天任务分析与设计;崔村燕,女,博士,副教授,硕士生导师。主要研究方向:航天发射安全;段永胜,男,博士,讲师。主要研究方向:航天任务可靠性。

Interval interference time-variant reliability analysis method for propellant tank

XIN Tengda1, ZHAO Jiguang2, CUI Cunyan3, DUAN Yongsheng3   

  1. 1. School of Graduate, Space Engineering University, Beijing 101416, China;
    2. Department of Electronic and Optical Engineering, Space Engineering University, Beijing 101416, China;
    3. Department of Aerospace Science and Technology, Space Engineering University, Beijing 101416, China
  • Received:2019-06-10 Published:2020-04-21

摘要: 在推进剂贮箱服役期内,由于材料强度退化及外界随机载荷等不确定因素的存在,其可靠性表现为时变特性。基于区间理论与应力-强度干涉理论,为推进剂贮箱时变可靠性分析提供了一种区间干涉时变可靠性分析方法。通过对椭球底圆柱贮箱应力进行分析,根据贮箱等效应力分布与强度幂指数退化模型,将应力与强度转换为时变区间变量的形式。结合应力-强度干涉理论,将任意时刻应力与强度区间转换为标准化区间,根据临界状态函数与标准化区间的位置关系,定义区间干涉时变可靠性指标。结合示例参数对推进剂贮箱时变可靠性进行了分析,并与服从正态分布的应力-强度干涉可靠性方法及区间可靠性方法分析结果进行了对比,验证了所提方法的有效性。

关键词: 推进剂贮箱, 时变可靠性, 区间理论, 应力-强度干涉, 可靠性分析

Abstract: 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.

Key words: propellant tank, time-variant reliability, interval theory, stress-strength interference, reliability analysis

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