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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2007

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Dynamic properties identification for laminated plates

Diveyev B., Stocko Z., Topilnyckyj V.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

227-230

Purpose: The study aims to identify elastic properties of laminated plates from the measured dynamical properties. Design/methodology/approach: Elastic constants of laminates have been determined by using an identification procedure based on experiment design, and multi-level theoretical approach. Findings: The present paper is the first attempt at proposing a novel procedure to derive stiffness parameters from forced sandwich plates. The main advantage of the present method is that it does not rely on strong assumptions on the model of the plate. The key feature is that the raw models can be applied at different vibration conditions of the plate by a suitable analytical ore approximation method. Research limitations/implications: In the future the extension of the present approach to sandwich plates will be performed in order to test various experimental conditions. Practical implications: Structures composed of laminated materials are among the most important structures used in modern engineering and especially in the aerospace industry. Such lightweight and highly reinforced structures are also being increasingly used in civil, mechanical and transportation engineering applications. Originality/value: The main advantage of the present method is that it does not rely on strong assumptions on the model of the plate. The key feature is that the raw models can be applied at different vibration conditions of the plate by a suitable analytical ore approximation method.

Diskrete-continuum methods application for rotating machine-absorber interaction analysis

Stocko Z., Diveyev B., Topilnyckyj V.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

387-390

Purpose: The main aim of this paper is improved dynamic vibration absorbers design with taking into accout complex rotating machines dynamic. Design/methodology/approach: The numerical schemes row is considered for the complex vibroexitated constructions. Methods of decomposition and the numerical schemes synthesis are considered on the basis of new methods of modal synthesis. Findings: Development of mathematical models of complicated machines and buildings in view of their interaction with system of dynamic vibration absorbers. Dynamic vibration absorbers - complicated rotating machines system design optimized on vibro- absorption properties. Research limitations/implications: The research must be done for non-linear rotor dynamics. Practical implications: The absorbers designed in accordance with this paper can be applied not only to electric machines or aeronautic structures, but to any other type of vibro-exitated structure, such as cars, chisel installation, optical, magneto-optical disks, washing machine, refrigerator, vacuum cleaner, etc. Originality/value: The paper has novelty both in theoretical, and in practical aspect. In order that optimal parameters of DVA be determinate the complete modeling of dynamics of rotating machine should be made. Traditional design methodology, based on discontinuous models of structures and machines are not effective for high frequency vibration.