Pogo oscillation is a self-excited vibration in liquid-propellant rocket engines caused by combustion instability.[1] The unstable combustion results in variations of engine thrust, causing variations of acceleration on the vehicle's flexible structure, which in turn cause variations in propellant pressure and flow rate, closing the self-excitation cycle. The name is a metaphor comparing the longitudinal vibration to the bouncing of a pogo stick. Pogo oscillation places stress on the frame of the vehicle, which in severe cases can be dangerous.[1]
^ abTom Irvine (October 2008). "Apollo 13 Pogo Oscillation" (PDF-0.96 Mb). Vibrationdata Newsletter. pp. 2–6. Retrieved June 18, 2009.
Pogooscillation is a self-excited vibration in liquid-propellant rocket engines caused by combustion instability. The unstable combustion results in variations...
Look up pogo in Wiktionary, the free dictionary. Pogo, PoGo or POGO may refer to: Pogo stick, a toy used for jumping up and down with the aid of a spring...
Pogopalooza. Pogo (dance) Pogooscillation, a dangerous oscillation produced by rocket engines Powerbocking Space hopper, another kind of bouncing toy Pogo pin...
could be made ready by December 1; and von Braun was confident the pogooscillation problems that had afflicted Apollo 6 had been fixed. Almost every senior...
site. On the Apollo 13 mission, the inboard engine suffered major pogooscillation, resulting in an early automatic cutoff. To ensure sufficient velocity...
engine to achieve another high-speed reentry. The Saturn V experienced pogooscillation, a problem caused by non-steady engine combustion, which damaged fuel...
techniques. The crew encountered some problems during the flight: pogooscillations during the launch phase and a brief, uncontrolled tumble of the LM...
reported abnormal vibrations that appeared 120 seconds after launch (pogooscillation), which he described as "very uncomfortable." As a consequence, corrective...
(pointing) which is often called jitter. Similar phenomena can cause pogooscillation and can result in structural failure of a space vehicle. Another example...
behaved normally. Then, as the Saturn V's S-IC first stage burned, pogooscillations shook the vehicle. The thrust variations caused the Saturn V to experience...
stages gave more trouble than on Apollo 4 (the mission experienced pogooscillation during its first stage and had an early second-stage engine shutdown)...
engine shut down about two minutes early. This was caused by severe pogooscillations. Starting with Apollo 10, the vehicle's guidance system was designed...
70% of test launches. On one occasion, an A-4 rocket suffering from pogooscillations during ascent veered 90 degrees off course then spiralled back down...
Volkswagen Beetle) The launch went perfectly except for a few seconds of pogooscillation (axial vibration of the rocket). This was measured at +0.38 g (3.7 m/s2)...
considerable difficulty being man-rated due to early problems with pogooscillation. The launch vehicle used a radio guidance system that was unique to...
launch vehicle for Apollo 13. A number of changes were made to avoid pogooscillations, that had caused an early shutdown of the center J-2 engine on Apollo...
combustion instability that affected Project Mercury, and later on the pogooscillation problems that affected Project Gemini and Project Apollo Jeff Dozier...
smoothly into the engines. This phenomenon is known as "pogooscillations" or "pogo", named after the pogo stick.: 258 In the worst case, this may result in...
would also burn longer. Changes were also made to the S-II to dampen pogooscillations. Once all major systems were installed in the Saturn V, it was moved...
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