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A rocket engine feed system, includes a feed circuit including a device for varying a gas volume in the feed circuit to suppress the POGO effect. A method of suppressing the POGO effect varies at least one hydraulic resonant frequency by varying a rate at which gas is injected into the feed circuit.

A rocket engine feed system, includes a feed circuit including a device for varying a gas volume in the feed circuit to suppress the POGO effect. A method of suppressing the POGO effect varies at least one hydraulic resonant frequency by varying a rate at which gas is injected into the feed circuit.

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1. A feed system for feeding a rocket engine with a liquid propellant, the system comprising: a feed circuit; anda device to vary a volume of gas in the feed circuit, which device is configured to cause a volume of gas in the feed circuit to vary while the rocket engine is in operation,wherein the d

1. A feed system for feeding a rocket engine with a liquid propellant, the system comprising: a feed circuit; anda device to vary a volume of gas in the feed circuit, which device is configured to cause a volume of gas in the feed circuit to vary while the rocket engine is in operation,wherein the device to vary the volume of gas comprises a hydraulic accumulator with a variable liquid level, the hydraulic accumulator including a plurality of dip tubes, each including a respective valve and connecting a duct of the feed circuit to a respective distinct liquid level, wherein each dip tube extends to a surface of the liquid at their respective distinct liquid level. 2. A feed system according to claim 1, further comprising a control unit configured to control the device to vary gas volume. 3. A feed system according to claim 2, further comprising at least one sensor connected to the control unit, and wherein the control unit is configured to control variation in the gas volume as a function of signals sensed by the at least one sensor. 4. A feed system according to claim 3, wherein the at least one sensor comprises an accelerometer. 5. A feed system according to claim 3, wherein the at least one sensor comprises a sensor to sense pressure of the propellant. 6. A feed system according to claim 2, wherein the control unit is configured to control variation of the gas volume as a function of time. 7. A vehicle comprising a rocket engine including a liquid propellant having a feed system according to claim 1. 8. A method of suppressing a POGO effect, comprising: varying a volume of gas in a feed circuit of a system to feed a rocket engine with a liquid propellant while the rocket engine is in operation, to control a difference between at least one hydraulic resonant frequency of the feed circuit and at least one mechanical resonant frequency of a structure coupled to the feed circuit,wherein the variable gas volume is located at least in part in a hydraulic accumulator connected to a duct of the feed circuit and including a plurality of dip tubes, each including a respective valve and connecting the duct to a respective distinct liquid level, wherein each dip tube extends to a surface of the liquid at their respective distinct liquid level. 9. A method of suppressing the POGO effect according to claim 8, wherein the gas volume varies to keep the difference above a predetermined threshold. 10. A method of suppressing the POGO effect according to claim 8, wherein the gas volume is caused to vary as a function of at least one mechanical oscillation value sensed on the structure. 11. A method of suppressing the POGO effect according to claim 10, further comprising performing spectral analysis on at least one mechanical oscillation to determine the at least one mechanical resonant frequency of the structure. 12. A method of suppressing the POGO effect according to claim 11, wherein a filter algorithm, or an unscented Kalman filter, is applied to at least one sensed mechanical oscillation to determine the at least one mechanical resonant frequency and/or to predict its future variation. 13. A non-transitory computer readable medium including computer executable instructions for performing a method of suppressing the POGO effect according to claim 8.