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Damping effects are of great interest for structural analysis and evaluations. Structural modal damping characteristics can be obtained from experiments. This paper introduces new possibilities for the modelling of the damping of a dynamic system with classical normal modes and provides an overview of the known methods for formulating a damping matrix base with experimental modal damping values. The proposed method offers an opportunity to extrapolate modal damping values for unmeasured modesdoi:10.2478/v10189-012-0018-3 fatcat:yzzqaairffh7reryvh4rclehum