蓄压器膜盒机械刚度对液体火箭POGO振动影响研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (19) : 168-171.

论文

刘锦凡孙丹陈雪巍

作者信息 +

Influences of mechanical stiffness of accumulator on Pogo vibration in liquid rockets

LIU Jin-fan SUN Dan CHEN Xue-wei

Author information +

文章历史 +

摘要

在以往的POGO分析中，蓄压器的模型并未考虑膜盒机械刚度。但试验表明，蓄压器金属膜盒具有一定机械刚度，尤其是在受到较大压缩时，机械刚度会很大。较大的机械刚度会降低蓄压器的总柔度，影响蓄压器对POGO的抑制效果。本文基于气液接触面的力平衡条件和流量连续方程，推导了考虑膜盒机械刚度的蓄压器动力学模型。并将新模型应用于某型号火箭的POGO稳定分析，分析了蓄压器膜盒刚度对POGO稳定性的影响。仿真结果表明，考虑膜盒机械刚度的蓄压器动力学模型比传统模型有更高的计算精度。因此在工程实际中考虑膜盒机械刚度的POGO稳定性分析结果更加准确可靠。

Abstract

The stiffness of accumulator is not considered in accumulator model of POGO analysis in currently. But the results of test show that the accumulator has the mechanical stiffness when the accumulator has been compressed, especially, the stiffness will be large, when the accumulator has been compressed largely. In this case, the accumulator compliance is decrease. It can affect the prevention effect of POGO vibration. In this paper, based on flow continuity equation and force equilibrium equation of Gas-Liquid, the new dynamic model of accumulator has been given considering the mechanical stiffness of accumulator. And the model has been applied in the simulation of POGO vibration, it can be shown that the results of the new model can be compared with the original model. It can be shown that the results of the new model can not only give the precise stability analysis of POGO vibration but also the pictures of the process are much more close to the real processes. Thus, the stability analysis of the POGO vibration has better precise results in engineering, considering the mechanical Stiffness of accumulator.

导出引用

刘锦凡孙丹陈雪巍. 蓄压器膜盒机械刚度对液体火箭POGO振动影响研究[J]. 振动与冲击, 2016, 35(19): 168-171

LIU Jin-fan SUN Dan CHEN Xue-wei. Influences of mechanical stiffness of accumulator on Pogo vibration in liquid rockets[J]. Journal of Vibration and Shock, 2016, 35(19): 168-171

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