TITLE Generation of electrical energy through piezoelectric science

Based on the energy-minimization method in molecular simulation, the origin of piezoelectricity in b-phase PVDF crystals was investigated. Simulation results indicated that under the action of a constant applied voltage, PVDF crystal would be stretched or compressed, dependent on the orientation of dipoles and the polarity of the applied voltage. This paper presents a piezoelectric-excited membrane device for rapid measurement of liquids viscosity and density. The working principle of the device is based on membrane’s resonant frequency and Q factor responses to the damping effects of a surrounding liquid. this paper describes a numerical model which is used for the computataion of stresses, electric potential and displacement histories in a hollow piezoelectric shpere subjected to an internal pressure and adistributed temperature field.the mentioned model is on the basis of the mendelson,s method which predicts the variation of the stresses,electric potential and displacement with time through the thick nes.

کلیدواژه ها:

Piezoelectric ، electricial energy ، energy source ، energy production