In this paper, a novel aluminum nitride (AlN) resonant pressure sensor with piezoelectric-excitation and piezoelectric-detection is presented. The key structure of resonator an AlN flexible beam. Parallel electrodes are designed on the beam to excite resonance in-plane. All layers grown silicon-on-insulator (SOI) wafer by deposition process. Anchor islands fabricated in top silicon layer SOI. o...

We track the path difference between interferometer arms with few-nanometer accuracy without adding optics to the beam path. We measure the interference of a helium-neon beam that copropagates through the interferometer with midinfrared pulses used for multidimensional spectroscopy. This can indicate motion, but not direction. By oscillating the path length of one arm with a mirror on a piezoel...

ABAQUS can be utilized in the numerical simulation of active feedback control for the purpose of vibration suppression of structural systems. Using the example of active control of a cantilever beam, the Positive Position Feedback (PPF) control algorithm is coupled into an ABAQUS dynamical structural model with the assistance of user-defined subroutines. The transient response of the beam with ...

The FOSDT (the First Order Shear Deformation Theory) is taking into consideration to study the static behavior of a bimorph beam, with a delamination zone between the upper and the lower layer. The effect of limit conditions and lengths of the delamination zone are presented in this paper, with a PVDF piezoelectric material application. A FEM “Finite Element Method” is used to discretize the be...

The dynamic analysis of structures with piezoelectric sensors and actuators is used in this paper to establish a method for crack detection in aerospace structures. Piezoelectric strips used as sensors and actuators are bonded on both sides of a thin structure which executes flexural oscillations. The differential voltage outputs of the piezoelectric sensors are used to detect the presence of c...

The small amount of power demanded by many present-day electronic devices, opens the possibility to convert part of the energy present in the environment into electrical energy, using several methods. One of such methods is to use piezoelectric film bending beams inside the shoe, and use part of the mechanical energy employed during normal walking activity. This work analyzes several bending be...

An innovative actuation principle is introduced in this paper to drive a rotary motor using an anisotropic piezoelectric composite laminate. The driving element is a three layer laminated beam with piezoceramics sandwiched between two anti-symmetric composite laminae. By taking advantage of material anisotropy, torsional motion can be induced from in-plane strain actuation. With such structural...