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Use of an active element for dynamic control of a thin-walled laminated beam with kinematic excitation

Gawryluk Jarosław, Mitura Andrzej, Teter Andrzej

Archive of Mechanical Engineering

2019

Vol. LXVI, nr 3

379--387

The paper describes the dynamics of a composite cantilever beam with an active element. The vibrations of the kinematically excited beam are controlled with the use of a Macro Fiber Composite actuator. A proportional control algorithm is considered. During the analysis, actuator is powered by a time-varying voltage signal that is changed proportionally to the beam deflection. The MFC element control system with the implemented algorithm allowed for changing the stiffness of the tested structure. This is confirmed by the numerical and experimental results. Resonance curves for the beam with and without control are determined. The results show a very good agreement in qualitative terms.

Study on normal stresses in composite curved beams subjected to unsymmetrical bending

Aimin Y.

Engineering Transactions

2002

Vol.50, iss.3

177-185

Based on the formula for normal stresses in curved beams of one material, the formulae for normal stresses in composite curved beams with general cross-sectional shape under complicated loads can be derived. The novel formulae presented in this paper can be used in evaluating the normal stresses of connecting rod bush coated with bearing metal for internal combustion engine. These normal stress formulae, in special case, are reduced to those for composite curved beams subjected to symmetrical bending. A numerical example is given for verification at the end of this paper.