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

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (19) : 168-171.

LIU Jin-fan SUN Dan CHEN Xue-wei

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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.

Key words

POGO / Accumulator / Stiffness of accumulator / Dynamic model

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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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