Pogo oscillation

For other uses, see Pogo.

Pogo oscillation is a self-excited type of vibration in liquid-propellant rocket engines caused by combustion instability. The unstable combustion results in variations in engine thrust, causing variation in the acceleration exerted upon the vehicle's flexible structure, which in turn causes variations in engine propellant pressure and flow rate, closing the self-excitation cycle.

The name is metaphorical, comparing the longitu­dinal axis vibration to the bouncing of a pogo stick. Pogo oscillation places stress on the vehicle frame, which can be dangerous if excessive.‍

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