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Journal of Applied Mechanics and Technical Physics

2016 year, number 2

Theoretical-Experimental Method of Determining the Drag Coefficient of a Harmonically Oscillating Thin Plate

A. G. Egorov1, A. M. Kamalutdinov1, V. N. Paimushin2, V. A. Firsov2
1Kazan' Federal University, Kazan', 420008 Russia
2Kazan' National Research Technical University named after A. N. Tupolev, Kazan', 420111 Russia
Keywords: свободные механические колебания, коэффициент сопротивления, вязкая несжимаемая жидкость, демпфирование, декремент колебаний, free mechanical oscillations, drag coefficient, viscous incompressible fluid, damping, decrement of oscillations

Abstract

A method for determining the drag coefficient of a thin plate harmonically oscillating in a viscous incompressible fluid is proposed. The method is based on measuring the amplitude of deflections of cantilever-fixed thin plates exhibiting damping flexural oscillations with a frequency corresponding to the first mode and on solving an inverse problem of calculating the drag coefficient on the basis of the experimentally found logarithmic decrement of beam oscillations.