Modification of Modal Properties of a System With Non-Proportional Damping Due To Vibration Absorbers and Sub-Soil Interaction
Abstract eng: The paper deals with a complex linear dynamic system with proportional damping, which is completed by various elements making the final system non-proportionally damped. Such effects emerge due to vibration absorbers, soil-structure interaction and other components and details. Influence of subsequently attached elements being a source of the non-proportional damping are reflected using perturbation method on the level of the first degree of a small parameter. This parameter characterizes the damping non-proportionality as the relevant perturbation. In the role of the first step the proportionally damped system is adopted. The basic system includes such a part of individual supplements to keep the proportional damping. Eigen-functions of the basic system are then used as a certain variational basis for approximate analysis of eigen-values and eigen-modes of the original system respecting non-proportionality. Wide numerical experiments have been carried out investigating interaction of eigen-modes between resonance domains. Applicability and shortcomings of proposed analytical-numerical procedures are commented. A few hints to improve the dynamic model fidelity and to reduce an effort of numerical evaluation are given. A couple of recommendations for engineering application of supplementary elements concerning their dynamic properties are indicated. Some open problems and perspectives of further development are outlined.
Contributors:
Publisher:
National Technical University of Athens, 2013
Conference Title:
Conference Title:
COMPDYN 2013 - 4th International Thematic Conference
Conference Venue:
Island of Kos (GR)
Conference Dates:
2013-06-12 / 2013-06-14
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
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Record created 2016-11-15, last modified 2016-11-15