By R S Ryan; George C. Marshall Space Flight Center
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Additional resources for A history of aerospace problems, their solutions, their lessons
In attempting to remove any residual effects of this suspension system on the free-free modes, an analytical technique (filtering of data) was attempted. Due to round-off errors in the data, instead of removing any unwanted effects, the process introduced three false modes in addition to the actual modes. Incorporating these modes into the control stability analysis indicated an unstable vehicle. The initial launch was held up for 2 weeks to sort out the problem. This problem got played in a Fortune magazine feature article.
Skylab started out as a “wet workshop,” which was an active SVB stage outfitted on the ground with laboratories, etc. After the SIV B burn, the stage would be purged and made ready as a workshop. The observatory, ATM, was launched separately and was first to be a free flyer or docked with the spent SIV B stage, the workshop. As the program evolved, these concepts were dropped, with the basic SIV B stage being remanufactured to being a dry workshop. In other words, it was built and launched as a combined ATM and workshop with the docking adapter.
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. Single-point random structural dynamic testing technology was developed and applied to the lox tank/bulkhead hydroelastic testing. Defining and ensuring correct and known test boundary conditions were also major issues. , associated with problems such as pogo that occurred on Saturn V.