液体火箭金属膜盒式蓄压器的动力学模型

蓄压器是抑制液体火箭POGO振动的重要装置,通过推导建立了更具普适性的蓄压器精细化动力学模型,给出了膜盒刚度、动质量以及膜盒组件数量对蓄压实际柔度参数、惯性系数的修正方法,该模型提高了输送系统液路频率的计算精度。针对带有充气管路的蓄压器结构形式,引入了充气管路的分布参数动力学模型。研究发现较长的充气管路不仅会对蓄压器产生一定的附加容积效应,同时会形成新的低频振动,影响蓄压器吸收压力脉动的能力。

Dynamic model study of metal bellows accumulator for liquid launch vehicles

Accumulator is an important device used for POGO prevention of liquid rockets.In this paper,a general and accurate dynamic model of bellows accumulator was developed by theoretical derivation.A corrected method of compliance and inertia parameters considering the mechanical stiffness,moving mass and number of bellows subassembly was present.This model improves the precision of the frequency calculation of the fluid feeding system.As to the accumulator with charging duct,a distributed parameter model was introduced to research the influence of a long duct for the accumulator.The research shows that a long charging duct will make additional volume and meantime introduce low frequency vibration,which affects the accumulator performance.