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Articles by Sawal H. Md Ali
Total Records ( 2 ) for Sawal H. Md Ali
  M.S. Bhuyan , B.Y. Majlis , M. Othman , Sawal H. Md Ali , C. Kalaivani and Shabiul Islam
  Dependency on battery as the only power source is putting an enormous burden in many applications due to size, weight, safety and lifetime constraints etc. Emerging applications like wireless sensor networks, implantable medical devices, heating ventilation and air conditioning system for indoor and automotive environmental comfort are examples of such class. In addition, it is often impractical to operate these systems using battery owing to the difficulty in replacing battery. Therefore, the ability to harvest ambient energy is vital for battery less operation. In this study, novel modeling of a micro energy harvester aimed at harvesting energy from fluid-flow induced vibration, through piezoceramic cantilever means is presented. The strategy pursued in order to harvest energy in low fluid-flow conditions, couples vortex shedding from a D-shaped bluff-body to a piezoelectric cantilever attached to the bluff-body. Fluidic pressure impulse on piezoelectric cantilever beam due to vortex shedding results in lift force. Fluctuation of fluidic pressure causes flexible cantilever to vibrate in the direction normal to fluid flow. Deformation of the piezoceramic cantilever converts mechanical energy into electrical energy through its crystalline structure. COMSOL-multiphysics simulations and results are presented in details to demonstrate the feasibility of the harvester in low fluid-flow velocities conditions ranging 1-5 m sec-1. In a (200x150x150) μm3 rectangular duct, at 5 m sec-1 fluid velocity, the (50x40x2) μm3 piezoelectric cantilever experienced concluding statement concluding statement 3088 Pa stress. The resulting cantilever deflection produced 2.9 mv, which is sufficient to drive an ultra-low-power rectifier circuit. This harvester is designed as a useful power source to replace or supplement batteries.
  Shafii A. Wahab , Shabiul Islam , M.S. Bhuyan , S. Jahariah and Sawal H. Md Ali
  The development of wireless sensor network has been driven by recent new advance technologies in low-power energy integrated micro devices. The scattered nature of the sensor topologies requires its own power but the main obstacle to the battery power operation is limited resources. As a result, it must be replaced when it is exhausted. Moreover, it is difficult if the sensor is embedded in a particular object and its environment are harmful for the battery replacement and also require higher cost. To overcome the problem, natural resources known as wind energy, vibration, temperature and solar, etc., can be considered as input sources. However, vibration is the best energy source because it can be found anywhere and according to the use of piezoelectric materials that have the ability to convert mechanical energy into electrical energy. The proposed research work on power conditioning circuit will be investigated, modelled and designed using synchronized switch harvesting on inductortechnique from piezoelectric vibration. In this regards, the power conditioning circuitenergy harvester can generate more energy and then stores the generated power into large reservoir capacitance, followed by combination of a charge pump-type circuit and etc. The development of the power conditioning circuit energy harvester will be modelled and simulated using PSPICE Software. Later on, the power conditioning circuit harvester will be implemented into printed circuit board layout. Finally, the comparison will be given by the power conditioning circuit performance between the simulated results in PSPICE and the validated hardware implementation into printed circuit board layout. The developed power conditioning circuit harvester can be used to replace the external battery for powering-up the low-power micro devices.
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