The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform

Eugenio Ruocco - One of the best experts on this subject based on the ideXlab platform.

  • effects of nonlinear strain components on the buckling response of stiffened shear deformable composite plates
    Composites Part B-engineering, 2015
    Co-Authors: Eugenio Ruocco
    Abstract:

    Abstract A detailed investigation of the weight of each non linear term of the Green–Lagrange strain Displacement Equation is presented, with reference to the buckling of orthotropic, both flat and prismatic, Mindlin plates. Usually in the literature, in buckling analysis only the second order terms related to the out-of-plane Displacement are considered. Such heuristic simplification, known as von Karman hypothesis, starts by the consideration that the buckling mode of a flat plate is described by dominant out-of-plane Displacement and disregards the non-linear terms of the Green–Lagrange strain tensor depending on the in plane Displacement components, whose role is confined to first order, say pre-critical, deformation. The present paper shows that disregarding the non linear terms related to the in-plane strain–Displacement is equivalent to neglect shear induced rotation. In the work, the governing Equations are derived using the principle of strain energy minimum and the differential Equations solution is gained by using the general Levy-type method. The obtained results show that the von Karman model overestimates the critical load when, in buckling mode, magnitudes of shear rotation, in-plane and out-of-plane Displacements are comparable.

Yueming Hu - One of the best experts on this subject based on the ideXlab platform.

  • Mathematical model of piezoelectric ejection for high-power LED phosphor coating process
    2013 10th IEEE INTERNATIONAL CONFERENCE ON NETWORKING SENSING AND CONTROL (ICNSC), 2013
    Co-Authors: Zhifu Li, Yueming Hu
    Abstract:

    Phosphor coating is one of the key steps in high-power LED packaging processes, among which the design of phosphor droplet ejecting head is the pivotal technology. Through the simplification of force Displacement Equation of piezoelectric actuator, the force-Displacement Equation of piezoelectric actuator is obtained. When considering the fluid movement, to avoid the complex analysis of the fluid movement in the cavity, the law of mass and energy conservation is employed, which will greatly simplify the analyzing procedure. As a result, the mathematical model of piezoelectric actuated micro-droplet jetting process is built. The calculating results and jetting rules shown by the model are basically according with the practically measured values.

  • ICNSC - Mathematical model of piezoelectric ejection for high-power LED phosphor coating process
    2013 10th IEEE INTERNATIONAL CONFERENCE ON NETWORKING SENSING AND CONTROL (ICNSC), 2013
    Co-Authors: Zhifu Li, Yueming Hu
    Abstract:

    Phosphor coating is one of the key steps in high-power LED packaging processes, among which the design of phosphor droplet ejecting head is the pivotal technology. Through the simplification of force Displacement Equation of piezoelectric actuator, the force-Displacement Equation of piezoelectric actuator is obtained. When considering the fluid movement, to avoid the complex analysis of the fluid movement in the cavity, the law of mass and energy conservation is employed, which will greatly simplify the analyzing procedure. As a result, the mathematical model of piezoelectric actuated micro-droplet jetting process is built. The calculating results and jetting rules shown by the model are basically according with the practically measured values.

Mauro Santos - One of the best experts on this subject based on the ideXlab platform.

  • stability to the dissipative reissner mindlin timoshenko acting on Displacement Equation
    European Journal of Applied Mathematics, 2016
    Co-Authors: A D S Campelo, D S Almeida, Mauro Santos
    Abstract:

    In this paper, we show that there exists a critical number that stabilises the Reissner–Mindlin–Timoshenko system with frictional dissipation acting only on the Equation for the transverse Displacement. We identify that the Reissner–Mindlin–Timoshenko system has two speed characteristics v 1 2 := K /ρ 1 and v 2 2 := D /ρ 2 and we show that the system is exponentially stable if only if \begin{Equation*} v_{1}^{2}=v_{2}^{2}. \end{Equation*} In the general case, we prove that the system is polynomially stable with optimal decay rate. Numerical experiments using finite differences are given to confirm our analytical results. Our numerical results are qualitatively in agreement with the corresponding results from dynamical in infinite dimensional.

  • Stability to the dissipative Reissner–Mindlin–Timoshenko acting on Displacement Equation †
    European Journal of Applied Mathematics, 2015
    Co-Authors: A D S Campelo, D. S. Almeida Júnior, Mauro Santos
    Abstract:

    In this paper, we show that there exists a critical number that stabilises the Reissner–Mindlin–Timoshenko system with frictional dissipation acting only on the Equation for the transverse Displacement. We identify that the Reissner–Mindlin–Timoshenko system has two speed characteristics v 1 2 := K /ρ 1 and v 2 2 := D /ρ 2 and we show that the system is exponentially stable if only if \begin{Equation*} v_{1}^{2}=v_{2}^{2}. \end{Equation*} In the general case, we prove that the system is polynomially stable with optimal decay rate. Numerical experiments using finite differences are given to confirm our analytical results. Our numerical results are qualitatively in agreement with the corresponding results from dynamical in infinite dimensional.

Zhifu Li - One of the best experts on this subject based on the ideXlab platform.

  • Mathematical model of piezoelectric ejection for high-power LED phosphor coating process
    2013 10th IEEE INTERNATIONAL CONFERENCE ON NETWORKING SENSING AND CONTROL (ICNSC), 2013
    Co-Authors: Zhifu Li, Yueming Hu
    Abstract:

    Phosphor coating is one of the key steps in high-power LED packaging processes, among which the design of phosphor droplet ejecting head is the pivotal technology. Through the simplification of force Displacement Equation of piezoelectric actuator, the force-Displacement Equation of piezoelectric actuator is obtained. When considering the fluid movement, to avoid the complex analysis of the fluid movement in the cavity, the law of mass and energy conservation is employed, which will greatly simplify the analyzing procedure. As a result, the mathematical model of piezoelectric actuated micro-droplet jetting process is built. The calculating results and jetting rules shown by the model are basically according with the practically measured values.

  • ICNSC - Mathematical model of piezoelectric ejection for high-power LED phosphor coating process
    2013 10th IEEE INTERNATIONAL CONFERENCE ON NETWORKING SENSING AND CONTROL (ICNSC), 2013
    Co-Authors: Zhifu Li, Yueming Hu
    Abstract:

    Phosphor coating is one of the key steps in high-power LED packaging processes, among which the design of phosphor droplet ejecting head is the pivotal technology. Through the simplification of force Displacement Equation of piezoelectric actuator, the force-Displacement Equation of piezoelectric actuator is obtained. When considering the fluid movement, to avoid the complex analysis of the fluid movement in the cavity, the law of mass and energy conservation is employed, which will greatly simplify the analyzing procedure. As a result, the mathematical model of piezoelectric actuated micro-droplet jetting process is built. The calculating results and jetting rules shown by the model are basically according with the practically measured values.

A D S Campelo - One of the best experts on this subject based on the ideXlab platform.

  • stability to the dissipative reissner mindlin timoshenko acting on Displacement Equation
    European Journal of Applied Mathematics, 2016
    Co-Authors: A D S Campelo, D S Almeida, Mauro Santos
    Abstract:

    In this paper, we show that there exists a critical number that stabilises the Reissner–Mindlin–Timoshenko system with frictional dissipation acting only on the Equation for the transverse Displacement. We identify that the Reissner–Mindlin–Timoshenko system has two speed characteristics v 1 2 := K /ρ 1 and v 2 2 := D /ρ 2 and we show that the system is exponentially stable if only if \begin{Equation*} v_{1}^{2}=v_{2}^{2}. \end{Equation*} In the general case, we prove that the system is polynomially stable with optimal decay rate. Numerical experiments using finite differences are given to confirm our analytical results. Our numerical results are qualitatively in agreement with the corresponding results from dynamical in infinite dimensional.

  • Stability to the dissipative Reissner–Mindlin–Timoshenko acting on Displacement Equation †
    European Journal of Applied Mathematics, 2015
    Co-Authors: A D S Campelo, D. S. Almeida Júnior, Mauro Santos
    Abstract:

    In this paper, we show that there exists a critical number that stabilises the Reissner–Mindlin–Timoshenko system with frictional dissipation acting only on the Equation for the transverse Displacement. We identify that the Reissner–Mindlin–Timoshenko system has two speed characteristics v 1 2 := K /ρ 1 and v 2 2 := D /ρ 2 and we show that the system is exponentially stable if only if \begin{Equation*} v_{1}^{2}=v_{2}^{2}. \end{Equation*} In the general case, we prove that the system is polynomially stable with optimal decay rate. Numerical experiments using finite differences are given to confirm our analytical results. Our numerical results are qualitatively in agreement with the corresponding results from dynamical in infinite dimensional.