On Asymptotical Method for Vibrations Analysis of Large Elastic Dynamical Systems
Abstract:
Large elastic dynamical systems are widespread in heavy, extractive
and manufacturing industry as well as in space-system engineering. Intensive
vibrations in such systems are possible but they are not admissible by
systems specifications. Before such systems were usually modelled with
a help of ODE's that caused significant discrepancies in results of investigations
and vibrations control. In this paper more exact model is used for a real
large flexible elastic dynamical system, which is
considered as a system with distributed and discrete parameters. This
mathematical model is a non-classical boundary value problem in PDE's.
The problem complexity results in impossibility to find its exact solution.
Therefore an asymptotical method is used for investigations. The conditions
at which vibration processes of different character take place in the considered
dynamical systems are defined. Also the formula for determination of frequencies
of possible vibrations is obtained. Influence of different parameters of
the dynamical systems on vibrations frequencies is analyzed. For the purpose
of active control of vibrations it is proposed to use some determined feedbacks
in the considered systems.
The research of Olena Mul was supported by FCT, fellowship SFRH/BPD/14946/2004.