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

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The new Sun shade worked in an excellent manner. With these initial problems solved, the Skylab missions continued providing much science as well as information of long-duration space work by humans. Skylab set the foundation for the upcoming space station. b. ATM Dynamic Response. A very interesting problem occurred due to the angles of orientation of the ATM during pointing relative to the MDA/workshop. The various observation angles changed the dynamic modes in a nonlinear manner, creating unusual demands on the control system logic.

The IUS was designed and built by Boeing. Figure 30 shows the basic IUS configuration as used by NASA for its different missions. It weighed 32,000 lb and was designed to fit into the shuttle cargo bay with the payload attached to the IUS nose. The configuration with the PAM-S attached with its payload is shown on figure 31. One additional part of the design had to do with the support cradle that had to raise the IUS perpendicular to the shuttle payload bay, then eject out of the bay. The first stage was not ignited until the orbiter had moved a safe distance from the IUS system.

Skylab set the foundation for the upcoming space station. b. ATM Dynamic Response. A very interesting problem occurred due to the angles of orientation of the ATM during pointing relative to the MDA/workshop. The various observation angles changed the dynamic modes in a nonlinear manner, creating unusual demands on the control system logic. In order to work this logic problem, dynamic modal analysis was made for each generic telescope orientation. These mode shapes and frequencies were used by control analysts to change the control logic and verify it, allowing ATM pointing without bending mode instability.

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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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