基于动力冗余的液体火箭动力系统频率特性分析

液体火箭在发射过程中,恶劣的动力学环境常常会引起发动机推力下降或提前关机等工作故障,引入动力冗余技术可以保证发动机故障后仍有足够动力保证火箭正常飞行,从而大幅度地提高系统的可靠性.针对动力冗余技术而提出的液体捆绑火箭推进剂交叉输送问题,以三种工作模式:芯级火箭与助推器独立工作(Mode 1);一台助推发动机故障,该助推...

Frequency Characteristic Analysis of Liquid Rocket Propulsion System with Redundant Design

The rugged working environment in the flight course of liquid vehicle often causes engine thrust dropping or prematurely shutting down and other working faults. The introduction of Redundant Propulsion Technology can ensure that the vehicle works normally after the engine has failed, which leads to great improvement in the reliability of liquid vehicle. In this paper, the Propellant Crossfeed of liquid vehicle with redundant propulsion system was discussed. The dynamic models of propulsion system of liquid vehicle under three different working modes: Independently working (Mode 1); when one booster engine faults, tanks of the booster will supply the superfluous propellants to the engines of core circuit (Mode 2); the propellants in all engines are supplied from the boosters for early separating boosters (Mode 3) were established by the finite element technology. The frequency characteristics were analyzed by the numerical method. The results show that the distribution of similar frequencies is more concentrated under Mode 1, and is more dispersed under two other modes. In addition, by comparing the capability of changing frequency for the accumulator energy value under the three working modes, the conclusion can be obtained that the capability under Mode 1 is the best, while it is worst under Mode 3.