Acoustic wave propagation through a plate fixed on a rigid frame via elastic spacers and located between two barriers. (English. Russian original) Zbl 1461.74027
J. Appl. Mech. Tech. Phys. 59, No. 4, 733-746 (2018); translation from Prikl. Mekh. Tekh. Fiz. 59, No. 4, 179-194 (2018).
Summary: The propagation of a stationary acoustic wave through an infinite thin plate stiffened on two sides by a system of absolutely rigid, crossed ribs and located between two absolutely rigid barriers. It is assumed that the plate and the ribs evenly distributed along rectangular Cartesian axes are connected through elastic spacers (supports) without slip. The dynamic deformation of the plate is described by the linearized Kirchhoff-Love equations of the classical theory of plates, the dynamic deformation of the spacers is described by two-dimensional and one-dimensional relations based on linear approximations of displacements of points of the coating and spacers along the thickness and taking into account only transverse compression and transverse shear, and the motion of acoustic media by the well-known wave equations. The solution of the problem is obtained using the Ritz method. The constructed solution was used to investigate how the physico-mechanical and geometric parameters of the mechanical system and the frequency of acoustic waves incident on the plate influence the sound-insulating parameters and the stress-strain state of the plate.
MSC:
| 74H45 | Vibrations in dynamical problems in solid mechanics |
| 74K20 | Plates |
| 74H05 | Explicit solutions of dynamical problems in solid mechanics |
Keywords:
periodicity cell; barrier; energy-absorbing coating; Kirchhoff-Love plate; transversely soft material; vibration frequency; exact analytical solutionReferences:
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