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Articles by B.Y. Majlis
Total Records ( 4 ) for B.Y. Majlis
  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.
  Mohammad Zayed Ahmed , M.S. Bhuyan , A.K.M. Tariqul Islam and B.Y. Majlis
  This study presents the fabrication of a 3D micro-transformer using MEMS technology in 10-600 kHz frequency range. The fabrication processes is developed for high-performance and low-cost realization with respect to planner design. The coil winding and the magnetic cores were fabricated by electro-deposition using copper and Ni/Fe Permalloy materials, respectively. In step-up configuration, the micro-transformer achieved 73.75% efficiency. The inductance achieved was 90 and 164 μH for primary and secondary coils, respectively. Characterization results and fabrication process of the fabricated transformer (2560x1240 μm) on alumina ceramic substrate are presented.
  M.S. Bhuyan , B.Y. Majlis , M. Othman , Sawal H. Md. Ali and Shabiul Islam
  This study presents multi-physics three-dimensional finite element simulation of a fluid flow based self-excited micro energy harvester. This micro energy harvester is modeled inside a micro fluid channel to convert fluid flow energy into fluid oscillations. Investigations are carried out for the impact of low fluid flow velocity ranging 1-5 m sec-1, associated voltage generation by piezoelectric means and various mechanical analyses to enhance the performance and robust design considerations. The piezoelectric micro cantilever is attached to a D-shaped bluff body. An axial fluid flow and the D-shaped bluff body interaction generate Karman Vortex Street in the wake of the bluff-body. Vortex shedding causes an asymmetry in pressure distribution on the surface of the bluff body which results in time-dependent forces acting on the attached flexible micro cantilever. Due to structural vibrations induced by the uniform and steady fluid flow, periodic strains are generated in the piezoelectric cantilever which converts the strain energy into electrical charge. Finite Element Analysis Software namely COMSOL Multiphysics are used for the Harvester Model and simulation. In a 200x150x150 μm3 rectangular duct, at 5 m sec-1 fluid velocity, the 50x40x2 μm3 piezoelectric cantilever experienced 3088 Pa stress with cantilever tip displacement around 60 μm. A maximum voltage of 2.9 mV was recorded at 5 m sec-1 fluid velocity that is sufficient to drive an ultra-low-power rectifier circuit for a complete energy harvesting system. This study in detail describes the harvester device modeling and finite element analysis in COMSOL. Instead of using ambient parasitic vibration, this Energy Harvester Model directly utilize fluid flow energy to improve harvesting capability. The micro energy harvester self-charging capability makes it possible to develop untethered sensor nodes that do not require any wired connection or battery replacement or supplement batteries. Integration of fluid flow based micro energy harvester device for the autonomous sensor network such as automotive temperature and humidity sensor networks.
  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.
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