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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

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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