阅读说明：本技术 面向发动机尾喷管可靠运动的关键结构参数优化方法 (Key structure parameter optimization method for reliable movement of engine tail nozzle ) 是由 金鑫 李寅岗 朱海天 刘璐 于 2021-06-25 设计创作，主要内容包括：本发明公开了发动机复合材料尾喷管的运动灵活度和可靠性的优化方法,包括步骤：第一步、分析影响尾喷管运动灵活度和可靠性的重要参数,确定优化对象；第二步、确认各优化对象参数的数值范围,针对这一范围进行后续的优化；第三步、制定发动机尾喷管运动性能评价指标和应力损伤失效指标；第四步、建立复合材料尾喷管的冲击动力学仿真,对各参数进行优化仿真计算；第五步、通过分析各参数对尾喷管的运动灵活度和可靠性的影响趋势,提出复合材料尾喷管销孔配合单边间隙、表面摩擦系数和驱动气压的参数选择建议指标。本发明解决了尾喷管运动灵活度低,易发生失效的问题,实现从感觉经验到理论方法、从定性摸索到定量优化的提升。(The invention discloses a method for optimizing the motion flexibility and reliability of a composite material exhaust nozzle of an engine, which comprises the following steps: analyzing important parameters influencing the motion flexibility and reliability of the tail nozzle and determining an optimized object; secondly, confirming the numerical range of each optimized object parameter, and carrying out subsequent optimization aiming at the range; thirdly, establishing an engine tail nozzle motion performance evaluation index and a stress damage failure index; fourthly, establishing impact dynamics simulation of the composite material exhaust nozzle, and performing optimization simulation calculation on each parameter; and fifthly, through analyzing the influence trend of each parameter on the motion flexibility and reliability of the tail nozzle, parameter selection suggestion indexes of the pin hole matching unilateral clearance, the surface friction coefficient and the driving air pressure of the composite material tail nozzle are provided. The invention solves the problems of low motion flexibility and easy failure of the tail nozzle, and realizes the promotion from sensory experience to a theoretical method and from qualitative groping to quantitative optimization.)