Applied Mathematics and Mechanics (English Edition) ›› 2019, Vol. 40 ›› Issue (6): 783-804.doi: https://doi.org/10.1007/s10483-019-2468-8

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Vibration analysis of FG annular sector in moderately thick plates with two piezoelectric layers

S. AZARIPOUR, M. BAGHANI   

  1. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran
  • 收稿日期:2018-07-04 修回日期:2018-09-13 出版日期:2019-06-01 发布日期:2019-06-01
  • 通讯作者: M. BAGHANI E-mail:baghani@ut.ac.ir

Vibration analysis of FG annular sector in moderately thick plates with two piezoelectric layers

S. AZARIPOUR, M. BAGHANI   

  1. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran
  • Received:2018-07-04 Revised:2018-09-13 Online:2019-06-01 Published:2019-06-01
  • Contact: M. BAGHANI E-mail:baghani@ut.ac.ir

摘要: Free vibration of functionally graded (FG) annular sector plates embedded with two piezoelectric layers is studied with a generalized differential quadrature (GDQ) method. Based on the first-order shear deformation (FSD) plate theory and Hamilton's principle with parameters satisfying Maxwell's electrostatics equation in the piezoelectric layers, governing equations of motion are developed. Both open and closed circuit (shortly connected) boundary conditions on the piezoelectric surfaces, which are respective conditions for sensors and actuators, are accounted for. It is observed that the open circuit condition gives higher natural frequencies than a shortly connected condition. For the simulation of the potential electric function in piezoelectric layers, a sinusoidal function in the transverse direction is considered. It is assumed that properties of the FG material (FGM) change continuously through the thickness according to a power distribution law. The fast rate convergence and accuracy of the GDQ method with a small number of grid points are demonstrated through some numerical examples. With various combinations of free, clamped, and simply supported boundary conditions, the effects of the thicknesses of piezoelectric layers and host plate, power law index of FGMs, and plate geometrical parameters (e.g., angle and radii of annular sector) on the in-plane and out-of-plane natural frequencies for different FG and piezoelectric materials are also studied. Results can be used to predict the behaviors of FG and piezoelectric materials in mechanical systems.

关键词: Newtonian fluid, non-Newtonian fluid, turbulent flows, numerical simulation, free vibration, annular sector, first-order shear deformation (FSD), piezoelectric, functionally graded material (FGM)

Abstract: Free vibration of functionally graded (FG) annular sector plates embedded with two piezoelectric layers is studied with a generalized differential quadrature (GDQ) method. Based on the first-order shear deformation (FSD) plate theory and Hamilton's principle with parameters satisfying Maxwell's electrostatics equation in the piezoelectric layers, governing equations of motion are developed. Both open and closed circuit (shortly connected) boundary conditions on the piezoelectric surfaces, which are respective conditions for sensors and actuators, are accounted for. It is observed that the open circuit condition gives higher natural frequencies than a shortly connected condition. For the simulation of the potential electric function in piezoelectric layers, a sinusoidal function in the transverse direction is considered. It is assumed that properties of the FG material (FGM) change continuously through the thickness according to a power distribution law. The fast rate convergence and accuracy of the GDQ method with a small number of grid points are demonstrated through some numerical examples. With various combinations of free, clamped, and simply supported boundary conditions, the effects of the thicknesses of piezoelectric layers and host plate, power law index of FGMs, and plate geometrical parameters (e.g., angle and radii of annular sector) on the in-plane and out-of-plane natural frequencies for different FG and piezoelectric materials are also studied. Results can be used to predict the behaviors of FG and piezoelectric materials in mechanical systems.

Key words: Newtonian fluid, non-Newtonian fluid, turbulent flows, numerical simulation, functionally graded material (FGM), annular sector, piezoelectric, free vibration, first-order shear deformation (FSD)

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