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Articles by Rosli A. Bakar
Total Records ( 2 ) for Rosli A. Bakar
  M.M. Rahman , A.K. Ariffin , S. Abdullah , M.M. Noor , Rosli A. Bakar and M. A. Maleque
 

Objectives: This study was focused on the finite element techniques to investigate the effect of surface treatment on the fatigue life of the vibrating cylinder block for new two-stroke free piston engine using random loading conditions.
Motivation:
An understanding of the effects related to the random loading is necessary to improve the ability of designers to accurately predict the fatigue behavior of the components in service. An internal combustion engine cylinder block is a high volume production component subjected to random loading.
Problem statement:
Proper optimization of this component that is critical to the engine fuel efficiency and more robustly pursued by the automotive industry in recent years. A detailed understanding of the applied loads and resulting stresses under in-service conditions is demanded.
Approach:
The finite element modeling and analysis were performed utilizing the computer aided design and finite element analysis codes respectively. In addition, the fatigue life prediction was carried out using finite element based fatigue analysis code. Aluminum alloys were considered as typical materials in this study.
Results: The frequency response approach was applied to predict the fatigue life of cylinder block using different load histories. Based on the finite element results, it was observed that the fatigue life was significantly influenced for the nitriding treatment. The obtained results were indicated that the nitrided treatment produces longest life for all loading conditions.
Conclusion: The nitriding process is one of the promising surface treatments to increase the fatigue life for aluminum alloys linear engine cylinder block.

  M.M. Rahman , Mohammed K. Mohammed and Rosli A. Bakar
  This study was investigated the effect of air-fuel ratio (AFR) and engine speed on performance of the single cylinder hydrogen fueled port injection engine. GT-Power was utilized to develop the computational model for port injection engine. One dimensional gas dynamics model was represented the flow and heat transfer in the components of the engine. Throughout the study, air-fuel ratio was varied from stoichiometric mixture to lean. The engine speeds were varied from 2500 to 4500 rpm. The results show that the air-fuel ratio and engine speed were greatly influence on the performance of hydrogen fueled engine especially Brake Mean Effective Pressure (BMEP), thermal efficiency and brake specific fuel consumption (BSFC). It was shown that decreases of the BMEP and brake thermal efficiency with increases of the engine speed and air-fuel ratio while the increases of the BSFC with increases of the speed and air-fuel ratio. The cylinder temperature increases with increases of engine speed however temperature decreases with increases of air-fuel ratio. The volumetric efficiency increases with increases of engine speed and equivalent ratio. The volumetric efficiency of the hydrogen engines with port injection is serious problem and reduces the overall performance of the engine. This emphasized the ability of retrofitting the traditional engines with hydrogen fuel with minor modifications.
 
 
 
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