REVIEWED BY ALLEN B. SATES 1 MR. Zeines is an instructor at the RCA Institutes and ha* written a bopk intended to present various mathematical tec-'Head, Control Design and Analysis Branch, Code 3051, Naval Weapon Center, China Lake, Oalif.
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There are multivariable systems which have free motions dominated by a limited number of clearly separable modes. In some cases it is possible to specifically control these modes, thereby improving overall control of the system. This paper is a discussion of when and how modal control may be applied.
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