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By R S Ryan; George C. Marshall Space Flight Center
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Additional info for A history of aerospace problems, their solutions, their lessons
This verification was accomplished with very little paper documentation and cost. Wind biasing technology matured and became a viable operational tool for adding flexibility and increasing margins. All these technologies required developing and maturing technologies in several additional areas. 1. Measuring and quantifying the atmospheric characteristics in terms of wind speed, shears, gust, and turbulence 2. Statistical data evaluation techniques, tools, and models 3. Structural dynamic characterization of complex systems.
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.
26). Figure 26. HEAO Atlas-Centaur. The spacecraft that carried the HEAO experiments was built by TRW Systems. Their role was to design and develop the HEAO spacecraft, to integrate the mission, to support launch operations and to perform flight operations of the in-orbit observations. The basic HEAO A is sketched on figure 27. A sketch of HEAO B is shown on figure 28, while HEAO C is shown in figure 29. The program was very successful, adding greatly to science and our understanding of the universe.