This study investigates the applicability of time reversal concept in modern acoustics to structural health monitoring. A time reversal method has been adapted to guided-wave propagation to improve the detectability of local defects in composite plate structures. Specifically, wavelet-based signal processing techniques have been developed to enhance the time reversibility of Lamb wave in thin c...

Applying strong electric field on piezoelectric actuators, on one hand very significant electroelastic material nonlinear effects will occur, on the other hand piezo plates and shells may undergo large displacements and rotations. In order to give a precise prediction of piezolaminated smart structures under large electric field, this paper develops a finite element (FE) model accounting for bo...

The miniaturization of sensors represents a promising approach for various systems health management. Dynamic pressure measurements have a very good potential to provide GTE diagnostics, maintenance management, and optimized performance, based on pressure variation measurements. In this paper, we will investigate vibrational behavior of piezoelectric microdiaphragm based pressure sensor with ap...

We develop a simple model for coupling the pseudo-Goldstone bosons of QCD Or's, K's, -q) to quark fields. This nonlocal model incorporates a momentum dependent dynamical quark mass ,~ (p) in a manner consistent with global chiral symmetry. Explicit current quark masses and gauge fields are also introduced. All low energy parameters of the chiral lagrangian are expressed in terms of ~(p). In par...

Mechanical vibrations induced in flexible structures such as beams and plates have been researched through various optimization functions and control theories to optimize transient response dynamic characteristics. Piezoelectric materials sensors/actuators have been used to reduce and control these vibrations. However, stiffened plate has not been investigated and it is a main and important par...

Guided-wave structural health monitoring (SHM) systems with piezoelectric sensors are investigated for localisation of barely visible impact damage in CFRP plates under vibration and different thermal conditions. A single baseline set is used in a delay-and-sum algorithm with temperature correction for damage localisation in a large temperature range. Damage localisation is also demonstrated un...

This study presents the analytical formulation and finite element solution of a fractional-order nonlocal plate under both Mindlin Kirchhoff formulations. By employing consistent definitions for kinematic relations, governing equations associated boundary conditions are derived based on variational principles. Remarkably, model gives rise to self-adjoint positive-definite system that accepts un...

In this paper, the effects of porosity distribution and piezoelectric layers on natural frequencies flutter aerodynamic pressure smart thick porous plates in supersonic airflow are studied. Based third-order shear deformation plate theory first-order piston theory, functionally graded embedded by investigated. The effective material properties, such as Young’s modulus mass density considered to...

The (001) plate-like BaTiO3 piezoelectric micromaterials are synthesized by topochemical microcrystal conversion technique. plates with a length of 2~10 μm and thickness 0.5~1.3 obtained. dependence morphology on synthesis conditions is discussed in detail. crystal symmetry multiscale domain structures systematically investigated various characterizations. X-ray diffraction (XRD) Raman spectra ...