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液体火箭发动机结构动力学设计关键技术研究综述

杜大华1,李斌2   

  1. 1. 西安航天动力研究所
    2. 航天推进技术研究院
  • 收稿日期:2022-05-31 修回日期:2022-09-27 出版日期:2022-09-30 发布日期:2022-09-30
  • 通讯作者: 杜大华
  • 基金资助:
    国家重点基础研究发展计划;装备预研共用技术项目

Review on key structural dynamic design technologies in liquid rocket engines

  • Received:2022-05-31 Revised:2022-09-27 Online:2022-09-30 Published:2022-09-30
  • Contact: Da-Hua DU

摘要: 随着液体火箭发动机技术的发展,结构动力学问题成为影响发动机寿命及可靠性的关键技术之一。经过多年努力,发动机结构从最初的静强度、安全寿命设计思想逐步发展为以动静强度联合、经济寿命设计为指导的研制理念和方法,并在型号中得到了成功应用,使发动机结构的工作可靠性得以大幅度提高。由于新型号火箭发动机结构的日益大型复杂化及工作环境的极端严酷性,为满足高性能、高可靠性、轻量化与可重复使用的研制需求,发动机结构动力学设计技术问题亟待解决。本文在分析发动机结构中典型动力学问题的基础上,梳理并重点介绍了载荷预计、动力学建模及模型修正、动强度评估与寿命评定、基于动力学优化的抗疲劳设计等关键技术,最后给出研究总结及展望。希望本文为液体火箭发动机结构动力学设计技术的发展提供支撑。

关键词: 动力学, 动强度, 疲劳, 寿命, 液体火箭发动机

Abstract: With the development of liquid rocket engine technologies, structural dynamic problems become one of the key factors regarding to the life and reliability of engines. In the past decades, the design concepts and methods of the engine gradually developed from the initial static strength and safety life design to the combination of dynamic and static strength, economic life design, which were widely used in engines. Consequently, the working reliability of the engine structures was improved greatly. Moreover, due to the increasing size and complex structure and the extreme harsh-ness of the working environment for the new rocket engines, the technical problems of engine structural dynamics de-sign should be solved urgently, in order to meet the needs of high performance, high reliability, light weight and reusabil-ity. In this paper, based on the analysis of typical dynamic problems in engine structures, the key technologies such as load prediction, dynamic modeling and model updating, dynamic strength assessment and life prediction, and anti-fatigue design on account of dynamics optimization, were introduced in detail. Finally, the research summary and pro-spect were also presented. This review is believed to give some guidance for the development of structural dynamics design technology of liquid rocket engines.

Key words: dynamics, dynamic strength, fatigue, life, liquid rocket engine

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