摘要:
蓄压器是抑制运载火箭纵向耦合振动的关键部件。本文针对低温蓄压器热缓冲测压导管进行了模态分析、疲劳寿命计算及优化设计。基于有限元分析方法获取热缓冲测压导管静载预应力、随机振动应力谱密度曲线,采用Goodman直线法进行静载修正;基于Miner线性损伤累积理论及Dirlik方法计算了热缓冲测压导管的疲劳寿命;基于受迫振动动力学方程,推导了共振状态下热缓冲测压导管能量的集中表达形式,提出了低温蓄压器测压导管优化改进方法和措施。通过合理布局、优化设计,实现了低温蓄压器热缓冲测压导管固有频率的调整,避开了振动激励高能量区,提高了热缓冲测压导管的抗振疲劳性能。
Abstract:
The accumulator is a key component to suppress the longitudinal coupling vibration of the rocket. In this paper,the modal analysis,fatigue life calculation and optimization design are carried out for the thermal buffer pressure measuring tube of the low temperature accumulator. Based on the finite element analysis method,the static pre-stress and random vibration stress spectrum density curves of the pipe were obtained. The Goodman straight line method was used to correct the static load,and the fatigue life of the pipe was calculated based on the Miner linear damage accumulation theory and the Dirlik method. Based on the dynamic equation of forced vibration,the concentrated expression form of the duct energy in the resonance state is derived,and the optimization and improvement direction of the pressure measuring duct of the cryogenic pressure accumulator is proposed. Through reasonable layout and optimized design,the natural frequency of the thermal buffer pressure measuring tube of the low-temperature accumulator is adjusted,avoiding the high energy area of vibration excitation,and greatly improving the anti-vibration fatigue performance of the tube.
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