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Optimal vibration energy harvesting from nonprismatic piezolaminated beam
Alok R Biswal,Tarapada Roy,Rabindra K Behera 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.4
The present article encompasses a nonlinear finite element (FE) and genetic algorithm (GA) based optimal vibration energy harvesting from nonprismatic piezo-laminated cantilever beams. Three cases of cross section profiles (such as linear, parabolic and cubic) are modelled to analyse the geometric nonlinear effects on the output responses such as displacement, voltage, and power. The simultaneous effects of taper ratios (such as breadth and height taper) on the output power are also studied. The FE based nonlinear dynamic equation of motion has been solved by an implicit integration method (i.e., Newmark method in conjunction with the Newton-Raphson method). Besides this, a real coded GA based constrained optimization scheme has also been proposed to determine the best set of design variables for optimal harvesting of power within the safe limits of beam stress and PZT breakdown voltage.
Thermal analysis of randomly oriented carbon nanotube reinforced functionally graded timoshenko beam
Benedict Thomas,Prasad K Inamdar,Tarapada Roy 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
The unique thermal properties of carbon nanotubes (CNT) are utilized to increase the use of functionally graded material (FGM) athigher temperatures which resulted in introduction of a new type of material called as functionally graded carbon nanotube-reinforcedcomposites (FG-CNTRCs). To use the FG-CNTRCs at elevated temperatures, their thermal analysis is very important. In this context,this article presents the thermal analysis of a CNT based FG Timoshenko beam. Material properties distribution is assumed to vary alongthe thickness direction according to power law distribution and linear distributions. Finite difference method is implemented to find outthe temperature distribution. Using first order shear deformation theory (FSDT), expressions for strains and stresses are obtained. Theresults are compared with temperature distribution according to power law. The effect of CNT distribution on strains and stresses is alsoobserved. Based on these results important conclusions have been drawn.