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Articles by Shabiul Islam
Total Records ( 6 ) for Shabiul Islam
  Mohd Faizul Idros , Sawal Hamid Ali and Shabiul Islam
  The demand for engine oil monitoring system has increased recently due to the awareness of used engine oil pollution and as a cost reduction measure for the customer. Previously, many automotive manufacturers advised the customers to change their engine oil at a constant time (i.e., during service) or according to the mileage interval. There is a possibility that the engine oil is changed before the end of its lifetime which will incur higher maintenance cost to the customer. Furthermore, this situation will give bad input to the environment due to the excessive engine oil waste. This review paper described a potential mechanism for engine oil monitoring so that the oil is changed when deemed necessary. The research consists of data analysis, statistical analysis, intelligent system development, System on Chip (SoC) design, fabrication and testing. A statistical analysis of Multiple Linear Regression is used to predict the worst condition of the engine oil. Total Acid Number (TAN), Total Base Number (TBN), viscosity and oxidation level were chosen to be the main parameter for condition based monitoring purpose. A complete SoC design with Verilog Hardware Description Language (HDL) and FPGA implementation has been reviewed as a potential technique for the engine oil monitoring and changing time prediction system.
  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.
  Salah Hasan Ibrahim , Sawal Hamid Md. Ali and Shabiul Islam
  This study presents 32-bit Phase Accumulator (PA) design, using the pipelining stages with modified Brent-kung (BK) adder. In this design, clock pulse division technique applied to reduce the number of the registers and thus reduce the power consumption. The new architecture of the 32-bit Phase accumulator with modified BK adder and clock pulse division technique, reduce the number of PA registers from 119-81 registers correspond to about 32% reduction. The comparing results of the proposed PA designs with the other designs, using the ALTERA software (Quartus 2 Cyclone 3) reveals that the PA designs with modified BK run about 27% faster and less delay compared with the previous works, as well as with the lowest number of registers and logic cells.
  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.
  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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