Abstract
The paper presents the various types of tasks in structural dynamic identification. They differ according to the purpose whether a complete or a partial one is needed and also according to available experimental inputs. Where mode shapes on all coordinates were measured a variety of linear equations are available in the unknown structural parameters. There are other cases where only a part of the mode shapes is relevant and sufficient and, again some kinds of linear relationships can be used. In those cases where some important coordinates are inaccessible for measurement nonlinear equations must be used. For all the types of problems various mathematical procedures are described and illustrated. It is suggested that critical evaluation of these methods and their further development be accepted as a task for cooperative CIRP work.
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