大型液体火箭结构纵横扭振动与推进系统耦合(POGO)稳定性分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (10) : 167-173.

论文

王庆伟1，谭述君2，，吴志刚1,2，杨云飞3，于子文3

作者信息 +

POGO stability analysis of large liquid rocket considering longitudinal, lateral and torsional modal in structural system#br#

Wang Qingwei1, Tan Shujun2, Wu Zhigang1,2, Yang Yunfei3, Yu Ziwen3

Author information +

文章历史 +

摘要

大型液体火箭结构振动模态空间分布的特征，导致结构横向和扭转振动对传统POGO回路稳定性产生影响。对此，基于改进的Rubin建模方法，建立了结构纵横扭振动与推进系统液路脉动耦合的POGO回路模型。该模型具有非奇异的优点，可以直接应用于频域分析和时域仿真。基于该模型分析了中国某型号液体火箭推进系统的泵增益和蓄压器能量值等重要参数对结构纵向振动以及横向和扭转振动稳定性的影响。研究得出，泵增益的增大不仅使结构纵向第2、4阶模态不稳定也使结构横向第2阶不稳定。通过调节蓄压器能量值，不但可使结构纵向失稳的模态由不稳定变为稳定，也使结构横向失稳的模态由不稳定变为稳定，说明该型号液体火箭的推进系统不仅与结构系统的纵向模态存在耦合作用，也与横向模态存在耦合作用。因此，对于大型液体捆绑火箭，在研究POGO稳定性时分析结构纵横扭振动与推进系统的耦合作用是有必要的。

Abstract

The lateral and torsional vibration of structural system have importance influence on the stability of traditional POGO of large liquid rocket because of the spatial distribution characteristics of the structural mode. In this study, the model for POGO stability analysis considering longitudinal, lateral and torsional modal in structural system is developed based on the improved Rubin’s modeling method. Because of its non-singularity, this model can be directly used for frequency-domain analysis and time-domain simulation. The effects of pump gain and energy value of the accumulator on the POGO stability of a certain type of China liquid rocket is studied. The results show that the second order lateral modal, the fourth order lateral modal and the second order longitudinal modal become unstable from stable with the increase of pump gain. By adjusting the energy value of the accumulator, both the unstable longitudinal modal and lateral modal become stable, which indicates that coupling effect exists between the longitudinal modal and lateral modal of structural system and propulsion system in this rocket. Therefore, it is necessary to take the longitudinal, lateral and torsional modal of structural system into consideration in the POGO analysis of large liquid rockets.

导出引用

王庆伟1，谭述君2，，吴志刚1,2，杨云飞3，于子文3. 大型液体火箭结构纵横扭振动与推进系统耦合(POGO)稳定性分析[J]. 振动与冲击, 2016, 35(10): 167-173

Wang Qingwei1, Tan Shujun2, Wu Zhigang1,2, Yang Yunfei3, Yu Ziwen3. POGO stability analysis of large liquid rocket considering longitudinal, lateral and torsional modal in structural system#br#[J]. Journal of Vibration and Shock, 2016, 35(10): 167-173

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