STATE OF THE ART IN THE DEVELOPMENT OF METHODS FOR PREDICTING AND ASSURING THE POGO STABILITY OF LIQUID-PROPELLANT SPACE ROCKETS
Ключові слова:
liquid-propellant rocket POGO stability, liquid-propellant rocket propulsion system, oscillation frequencies and amplitudes, internal resonance, POGO damper, passive and active damping systems, mathematical simulation.Анотація
The POGO instability of liquid-propellant launch vehicles (LVs) occurs under certain conditions due to the interaction of low-frequency processes in the LV liquid-propellant propulsion system with the LV structure’s elastic vibrations along its longitudinal axis. This phenomenon manifests itself in a sharp increase in the amplitudes of the LV structure’s longitudinal vibrations and oscillations of the propulsion system’s operating parameters. High-power liquid-propellant LVs are prone to a loss of longitudinal stability, and thus its prevention or elimination are an important issue in the design of liquid-propellant space rockets and propellant feed systems thereof. POGO instability suppression and elimination are a complex technology, which involves the simulation of the dynamic system of LV structure – liquid-propellant propulsion system to describe LV longitudinal vibrations and analyze the stability of this system without POGO dampers and with various dampers. Methods and means of POGO elimination were under active development and discussion in the 1960-1990s. In recent decades, to the authors’ best knowledge, they have not been overviewed.
As a rule, the oscillatory instability of each new liquid-propellant LV is realized in a unique form of its own. Besides, with the development of rocket engineering, LV designs and layouts become more and more complex, and new materials and technologies are used. This gives rise to new variants of POGO realization and new factors that affect POGO stability and POGO oscillation parameters. The goal of this paper is to overview the state of the art in the development of methods for predicting and assuring the POGO stability of liquid-propellant space rockets with account for achievements in the development of new high-power liquid-propellant propulsion systems and in the design of LV stages. The advantages and drawbacks of various methods are discussed in detail from the standpoint of their reliability and efficacy and the importance of a comprehensive approach to POGO oscillation suppression. In addition, consideration is given to advanced trends in the passive and active control of liquid oscillations in rocket engine propellant feed systems from the standpoint of weakening their interaction with LV structural vibrations.
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