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

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (10) : 167-173.

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

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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.

Key words

POGO / longitudinal, lateral and torsional modal / stability / coupling model

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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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