A history of aerospace problems, their solutions, their by R S Ryan; George C. Marshall Space Flight Center PDF

By R S Ryan; George C. Marshall Space Flight Center

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All of this was done with very little computational capability, which points out the innovation and practicality of the engineers in dealing with complex technologies. Those were the days of slide rules and Marchant and Frieden desk calculators. As was mentioned previously, graphite jet vanes were used in the combustion gas stream (thrust stream) to control the thrust stream and thus the vehicle. However, severe erosion limited its effective control duration. This led to gimbaling the thrust chamber.

Pogo occurred to some degree on each Atlas flight near the end of the main stage burn. It was never viewed as a problem for most launches since the payloads could easily handle the loads. The concern for HEAO occurred because on the last two or three launches the amplitude increased. The concern was that this increase signaled a potential blossoming of pogo to the extent that it would be damaging to HEAO spacecraft. Much analysis of flight data and pogo studies were made in order to understand this potential problem.

35 It was learned and demonstrated during this time that in scale-model testing not only the materials had to be scaled, but also the manufacturing tolerances or else the nonlinearities of the gaps biased the dynamics. Modeling for pogo (S V) was even more complex due to the hydroelastic coupling. Tank bulkheads had to be modeled in detail. Propellant ducts had to have both their structures and acoustics determined as did the cavitation compliances of turbopumps. Verification required testing for many modes and instrumenting both the fluid and the structure.

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A history of aerospace problems, their solutions, their lessons by R S Ryan; George C. Marshall Space Flight Center

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