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Articles by Kiam Beng Yeo
Total Records ( 7 ) for Kiam Beng Yeo
  Kiam Beng Yeo , Rosalam Sabatly , Wen Yee Hau and Cheah Meng Ong
  This study presents the investigation of marine propeller hydrodynamic performance and parameters through Computational Fluid Dynamic analysis. Propellers with different Pitch to Diameter (P/D) ratio, propeller blade number (Z), skew angle, rake angle and Expanded Area Ratio (EAR) were subjected to computational flow analysis based on the Reynolds Averages Navier-Strokes Equation-(RANSE) solver. Results found that all thrust coefficient (KT) and torque coefficient 10 (KQ) decreases with the increasing advance coefficient (J). The efficiency of propeller performance had also consistently showed characteristic trend of nonlinear increases to a peak an optimum value before decreasing drastically with increasing J value. The analysis found that no single marine propeller achieve optimum performance in thrust, torque, efficiency and velocity with less loading on the mechanical properties.
  Kiam Beng Yeo , Wei Jin Leow , Wai Heng Choong and Fadzlita Mohd Tamiri
  Glass Fibre Reinforced Polymer (GFRP) composite material possesses mechanical properties and performances, potential for complex helicoidal marine propeller development. Preliminary investigation of composite marine propeller production using a specific closed-moulding designed for hand lay-up lamination of a single detachable low skew GFRP composite propeller blade was conducted. The GFRP laminate consists of E-glass woven fibre as reinforcement and unsaturated polyester resin (SHP 2719) as matrix material. Complex geometric laminated propeller blade was successfully reproduced after numerous processes of optimization of mould design, lay-up lamination, resin-mixture and curing pressure were carried out to improve the overall quality of the laminated blade.
  Kiam Beng Yeo , Wai Heng Choong and Wen Yen Hau
  The Finite Element Analysis (FEA) of marine propeller blade stress distribution due to hydrodynamic loading is presented and discussed. The analysis provided a better insight to complex marine propeller shape and interaction with hydrodynamic loadings. Stainless steel Wageningen B Series 3 blade propeller with 250 mm diameter, EAR of 0.5 and P/D ratio of 1.2 was adopted in the analysis. The propeller was subjected to the rotational speed of 0-6000 rpm. The pressure distribution demonstrated a positive pressure region on the face section and a negative region on the back section that produces the thrust generation. At 6000 rpm, a maximum positive pressure was achieved at 3225 kPa with a negative pressure of 7229 kPa. The hydrodynamic loading from the pressure distribution computation was applied to the stress distribution computation. From the analysis, the propeller blade stress distribution predicted a highly concentrated region near to the hub and decreasing with the growing value of the propeller radius. The highest stress value of 739 MPa at 6000 rpm was obtained at higher than the stainless steel yield stress (170 MPa) and the blade tip deflected towards the ship hull by 2.73 mm.
  Kiam Beng Yeo , Kenneth Tze Kin Teo and Wong Wei Loong
  Underwater autonomous device with capability of locomotion in liquid environment has become a popular area of interest as technology closes in the gap to match with reality. However, the nature in liquid environment is complex and it is current need to overcome maneuverability, mechanism robustness, speed, operation duration and control system that still pose a major challenge. Current trend of study are experimenting on aquatic animal inspired concept to mimic the mother nature of fish swimming to provide better option for a far more dynamic and efficient technique for underwater applications. This has motivated a brief review on the fish morphology and swimming mode, the underwater biomimetic fish modelling and simulation and finally the control system development so far.
  Kiam Beng Yeo , Wong Wei Loong and Kenneth Tze Kin Teo
  Fundamental fish swimming kinematic by sinusoidal fit consisting of smooth amplitude modulated travelling wave h(x,t) along the fish body from the nose to tail being a construe of wave amplitude envelope f(x) and a fish tail oscillation function g(t). Improved fundamental parameters by previous workers, such as the body wave speed (C), wavelength of body wave (λ), swimming speed (U), tail beat amplitude (A) and Strouhal-Number (St) were utilized in the simulation for designing the biomimetic robotic fish. Effects of these parameters on the swimming kinematic model had been developed for comparison between the Blacktip shark and biomimetic robot fish over a single cycle with 18 iteration of full fish body motion from nose to tail. Results showed that Blacktip shark could be seen to produce a more elongated body displacement shape as compared to the biomimetic robotic fish. Doubling the swimming speed (U) had also showed insignificant body motion change though increase in tail beat frequency and reduction of tail beat amplitude (A) and wavelength (λ) was obvious. The effect of doubling the tail beat frequency had also shown similar behavior as doubling the swimming speed.
  Kiam Beng Yeo , Kenneth Tze Kin Teo and Cheah Meng Ong
  Single slope solar still utilizes solar distillation technology to clean water from brackish water was investigated. The clean water output of solar still depends on the intensity of sunlight and how well the different mediums in solar still transfer the heat energy around. Thus, the temperature distribution in the single slope solar still was analysed using the explicit finite difference method. Side view of solar still is aligned with a mesh system, which accommodates nodes and specific equation to calculate the temperature at the next time-step for every derived node. Simulation result showed the trend of heat transfer process developing from the basin of solar still to the glass cover and the temperature recorded was about 65°C during 4 h of simulation time.
  Kiam Beng Yeo , Cheah Meng Ong and Kenneth Tze Kin Teo
  Single slope solar still absorbs the thermal energy from sunlight to distillate polluted water into clean water in an enclosed space. Principal of heat transfer and energy balance were the governing equations for the operation of single slope solar still. A mathematical model was developed to express these thermodynamics behaviours. In the model, critical parameters had been identified, such as slope angle of glass cover, mass of water in basin and wind speed. Simulation had been carried out and results revealed the importance of the slope angle matching the latitude of the experimental location, the increasing of water mass in the basin leading to decreasing of clean water production and the presence of wind speed also increase the output only when the sunlight is still sufficient.
 
 
 
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