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Articles by Shafii A. Wahab
Total Records ( 2 ) for Shafii A. Wahab
  M.S. Bhuyan , Sawal H. Md. Ali , M. Othman , B.Y. Majlis , Shafii A. Wahab and Shabiul Islam
  The study presented in this research targets the modeling and analysis of a 31 transverse mode type piezoelectric cantilever beam for voltage generation by transforming ambient fluid induced vibration energy into usable electrical energy. Piezoelectric materials have the ability to convert mechanical forces into an electric field in response to the application of mechanical stresses or vice versa. This property of the materials has found applications in sensor and actuator technologies and recently in the new field of energy harvesting. A mathematical model for energy harvesting by a piezoelectric cantilever beam device, based on classical beam analysis is presented. The optimization algorithm is implemented in Matlab, based on four physical dimension parameters of the energy harvesting cantilever. The optimal cantilever design from the theoretically derived algorithm determines four physical dimensions parameter to maximize output power. The output power is used to evaluate the performance of the energy harvester. Some interesting aspects that affect the generation of power are discussed. From this analysis, it is found that increasing the frequency of the vibration improve the output power while beyond a certain value further improvement can not be achieved by simply increasing the vibration frequency. Moreover, output power of the energy harvester is found as a function of external resistance. The model predicted anoptimized design with maximizes output power of 0.9 mW at a natural frequency of 200 Hz. Piezoelectric cantilever based energy harvester device can potentially replace the battery that supplies power in microwatt range necessary for operating wireless sensor devices.
  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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