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尕永婧, 李文钊, 宋乾强, 褚亮, 马一通, 解爽, 沈博. 重复使用液体火箭发动机可靠性评估方法[J]. 深空探测学报(中英文), 2022, 9(5): 498-505. DOI: 10.15982/j.issn.2096-9287.2022.20220035
引用本文: 尕永婧, 李文钊, 宋乾强, 褚亮, 马一通, 解爽, 沈博. 重复使用液体火箭发动机可靠性评估方法[J]. 深空探测学报(中英文), 2022, 9(5): 498-505. DOI: 10.15982/j.issn.2096-9287.2022.20220035
GA Yongjing, LI Wenzhao, SONG Qianqiang, CHU Liang, MA Yitong, XIE Shuang, SHEN Bo. Analysis of Reliability Evaluation Method of Reusable Liquid Rocket Engine[J]. Journal of Deep Space Exploration, 2022, 9(5): 498-505. DOI: 10.15982/j.issn.2096-9287.2022.20220035
Citation: GA Yongjing, LI Wenzhao, SONG Qianqiang, CHU Liang, MA Yitong, XIE Shuang, SHEN Bo. Analysis of Reliability Evaluation Method of Reusable Liquid Rocket Engine[J]. Journal of Deep Space Exploration, 2022, 9(5): 498-505. DOI: 10.15982/j.issn.2096-9287.2022.20220035

重复使用液体火箭发动机可靠性评估方法

Analysis of Reliability Evaluation Method of Reusable Liquid Rocket Engine

  • 摘要: 针对传统可靠性评估需要大量验证子样的问题,开展了重复使用液体火箭发动机可靠性评估方法的研究。分析了重复使用液体火箭发动机点火启动瞬态过程特点和失效模式,在此基础上,将发动机点火启动瞬态过程视作点火器顺利点火和启动瞬态过程两个独立的过程,并分别采用最大熵法和正态容许限法进行评估;同时,应用所研究的可靠性评估方法,分析了不同首次任务上升段可靠度要求和寿命形状参数对试车总时间的影响,以及可靠度随重复使用次数的变化规律。结果表明:所提评估方法能够用较少的试验次数获得较高的可靠性评估结果;随着可靠度要求的提高,发动机总试车时间大幅增加;提高寿命形状参数,在相同可靠度要求下,可大幅减少发动机总试车时间;在相同首次任务可靠度要求下,随着重复使用次数的增加,发动机可靠度逐渐减小。

     

    Abstract: Traditional reliability evaluation of liquid rocket engines requires a large number of verification samples. So the reliability evaluation method of reusable liquid rocket engine was studied. By analyzing the characteristics and failure modes of the instantaneous process of ignition for reusable rocket engines, and taking the instantaneous process of ignition as two independent processes (ignition process and transient development process), and the maximum entropy method and normal allowable limit method were evaluated individually. Meanwhile, the influence of reliability requirements and life shape parameters to total time of hot-fire tests, as well as the change of reliability with the number of tasks performed, were analyzed using the reliability evaluation method under study. It is shown that the proposed evaluation method can obtain higher reliability evaluation results with less test times. With the higher reliability requirements, the total time of hot-fire tests increases greatly; increasing the life shape parameters can greatly reduce the total time of hot-fire tests with the same reliability requirements; and the engine reliability decreases gradually with the increase of the number of tasks performed.

     

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