This paper reports the design, fabrication, and performance of piezoelectric bidirectional conveyors based on microelectromechanical systems (MEMS) featuring 3D-printed legs in bridge resonators. The structures consisted aluminum-nitride (AlN) film top millimeter-sized rectangular thin silicon bridges two electrode patches. position size patches were analytically optimized for travelling or sta...

A novel vortex induced piezoelectric energy converter (VIPEC) was present in this paper to harvest flow kinetic from the ambient environment through a beam. The consists of circular cylinder, pivoted beam attached tail cylinder and several patches. Vortex pressure difference acts on drives squeeze piezo patches convert fluid dynamic into electric energy. Transition Shear Stress Transport (SST) ...

Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems broaden the bandwidth. However, these prior are limited examining an identical configuration defects. Therefore, this paper aims propose new design concept for PnCs that examines differently configured defects broadband elastic wave loc...

This paper deals with the optimization of piezoelectric patches positioning on a beam attached to an inaccessible system. Based electro-mechanical coupling coefficients, which are calculated from mode shapes curvatures, problem is provide optimal in order target modes sensitive boundary conditions. Following theoretical description instrumented collocated patches, placement strategy proposed. l...

The structure of the control matrix of a direct strain rate feedback, based on collocated piezoelectric patches operated in surface mode, is analytically obtained in the elementary case of a simply supported beam. This kind of control, often improperly called "velocity feedback" because of a formal analogy with the equation of a classical velocity controlled system, has been exploited by severa...

Piezoelectric nanogenerators (PNGs) are capable of converting energy from various mechanical sources into electric energy and have many attractive features such as continuous operation, replenishment and low cost. However, many researchers still have studied novel material synthesis and interfacial controls to improve the power production from PNGs. In this study, we report the energy conversio...

The problem of shape control and correction of small displacements in composite structures using piezoelectric actuators glued or embedded was addressed. A finite element model based on Mindlin plate theory was used to characterize the behaviour of the structure and the one of the actuators. Emphasis was put on the development of an efficient and general methodology, based on genetic algorithms...

The waves propagating within complex smart structures are hereby computed by employing a wave and finite element method. The structures can be of arbitrary layering and of complex geometric characteristics as long as they exhibit two-dimensional periodicity. The piezoelectric coupling phenomena are considered within the finite element formulation. The mass, stiffness and piezoelectric stiffness...