由于飞行器结构与推进系统相互作用,很多液体火箭经受了不稳定纵向振动.此振动主要在运载火箭第一级液体助推器工作期间,以弹体一阶纵向振型的形式出现.根据共形态给它取了个绰号“Pogo”(高跷).典型的不稳定效应的一般表示如图1所示。振动自动地开始、增大、然后消失,经历时间一般10～40秒。振动频率与一阶结构频率相同,它 Due to the interaction of the aircraft structure with the propulsion system, many liquid rockets experience unstable longitudinal vibrations, mainly in the form of first longitudinal modes of the projectile during operation of the first stage liquid booster of the launch vehicle. Give it a nickname “Pogo.” The typical representation of a typical instability is shown in Figure 1. Vibration automatically start, increase, and then disappear, experience time is generally 10 to 40 seconds. Vibration frequency and the first-order structure of the same frequency, it