Continuous non-selfadjoint structures such as rotating or mass-transporting space frames are considered. Ways to actively add damping by use of implemented old and new modal control algorithms are investigated. Continuous eigenvalue problems are numerically solved in an efficient way. The solutions so obtained are used to express the combined control and observation problem in a unified matrix format The idea of modal filters is extended to the systems considered, and their implementation is numerically demonstrated to perform well. The IMSC (Independent Modal Space Control) and PI (Pseudo-Inverse) techniques, together with modal filters, are compared. It seems as if the PI technique possesses particular qualities when applied to a non-selfadjoint system. Numerical examples are presented.
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