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Articles by A.R. Ismail
Total Records ( 13 ) for A.R. Ismail
  A.R. Ismail , N. Jusoh , R. Zulkifli , K. Sopian and B.M. Deros
  Problem statement: Thermal comfort has a great influence on the productivity and satisfaction of indoor building occupants. The exposure to excessive heat during work may cause discomfort and contributed to low productivity among workers. Malaysia known with its hot and humid weather where in most of the survey study published indicated that workers in Malaysia automotive industries had exposed to excessive temperature while working. The study investigated the thermal comfort level experienced by workers at Malaysian automotive industry. Approach: The study had been conducted at one automotive parts assembly factory in Malaysia. The human subjects for the study constitute operators at tire receiving section of the factory. The environment examined was the relative humidity (%), WBGT, air temperature and radiant temperature (°C) of the surrounding workstation area. The environmental factors were measured using Babuc apparatus, which is capable to measure simultaneously those mentioned environmental factors. The time series data of fluctuating level of factors were plotted to identify the significant changes of factors. Then thermal comfort of the workers was assessed by using ASHRAE thermal sensation scale by using Predicted Mean Vote (PMV). Further Predicted Percentage Dissatisfied (PPD) was used to estimate the thermal comfort satisfaction of the occupant. Finally the PPD versus PMV were plotted to present the thermal comfort scenario of workers involved in related workstation. Results: The trend of relative humidity curve from the graph also indicated the increasing level of discomfort. The radiant temperature observed seems consistent during the study while there was decreasing of WBGT start from afternoon due to the rain. The study revealed that the PPD value of 54% of the workers population at the workstation are likely to be satisfied with thermal comfort at this station while the PMV index from ASHRAE indicated the value 1.07-1.41. Conclusion: The empirical study from the PPD and PMV index indicated that workers working at this were influenced by the heat. The less of PPD value from 80% of the population satisfied with the thermal comfort showed the environment factors that were not good for worker while the PMV index showed the area of work is slightly warm.
  A.R. Ismail , M.R.A. Rani , Z.K.M. Makhbul , K. Sopian and B.M. Deros
  Problem statement: The objective of this study was to determine the dominance effects of environmental factors such as Illuminance (lux), relative humidity (%) and
WBGT (°C) on the operators’ productivity at Malaysian automotive industry. Approach: One automotive parts assembly factory had been chosen as a subject for the study. The subjects were workers at the assembly section of the factory. The environment examined was the Illuminance (lux), relative humidity (%) and WBGT (°C) of the surrounding workstation area. Two sets of representative data including the Illuminance, relative humidity (%) and WBGT (°C) level and production rate were collected during the study. All the data was measured using Babuc apparatus which is capable to measure simultaneously those mentioned environmental factors. The time series data of fluctuating level of environmental were plotted to identify the significant changes of factors. Then Taguchi Method was being utilized to find the sequence of dominance factors that contributed to the productivity of operator at the specified production workstation. From there, optimum level for the three factors will be determine for optimum productivity. Further multiple linear regressions were employed to obtain the equation model in order to represent the relationship of these environmental factors towards productivity. Results: The thermal comfort assessments of this station which was the scale PMV was 2 and PPD is 79% ware likely to be satisfied by the worker. Conclusion: The study revealed that the dominant factor contribute to the productivity at the body assembly production line is WBGT and Illuminance whereas the empirical finding was closely related to the perception study by survey questionnaire distribution.
  Semin , R. A. Bakar and A.R. Ismail
  Problem statement: The Compressed Natural Gas (CNG) is a gaseous form of natural gas, it have been recognized as one of the promising alternative fuel due to its substantial benefits compared to gasoline and diesel. Natural gas is produced from gas wells or tied in with crude oil production. Approach: Natural gas is promising alternative fuel to meet strict engine emission regulations in many countries. Compressed Natural Gas (CNG) has long been used in stationary engines, but the application of CNG as a transport engines fuel has been considerably advanced over the last decade by the development of lightweight high-pressure storage cylinders. Results: The technology of engine conversion was well established and suitable conversion equipment is readily available. For petrol engines or spark ignition engines there are two options, a bi-fuel conversion and use a dedicated to CNG engine. The diesel engines converted or designed to run on natural gas, there were two main options discussed. There are dual-fuel engines and normal ignition can be initiated. Natural gas engines can be operated at lean burn and stoichiometric conditions with different combustion and emission characteristics. Conclusions: In this study, the low exhaust gas emissions of CNG engines research and development were highlighted. Stoichiometric natural gas engines were briefly reviewed. To keep the output power, torque and emissions of natural gas engines comparable to their gasoline or diesel counterparts. High activity for future green CNG engines research and development to meet future stringent emissions standards was recorded in the study.
  R. Zulkifli , M.J. Mohd Nor , M.F. Mat Tahir , A.R. Ismail and M.Z. Nuawi
  A comparison between acoustic sound absorption coefficient and transmission loss index of absorption panel using natural organic multi-layer coir fibre as the filler with and without perforated panels were studied this research. Experimental data obtained using reverberation room test method were compared with data from numerical simulation. The innovative sound absorption panel was developed and fabricated using treated coir fibre layers as sound absorption materials. The outer layer of the panel was fabricated from natural fibre/polyester composite panel. This innovative acoustic panel was tested at acoustic lab, faculty of engineering, Universiti Kebangsaan Malaysia using ISO 354 (1985) standard for noise absorption coefficient and ISO 717-1 standard for the transmission lost index. Simulation study was also conducted for the sound absorption panel using the Win FLAGTM software. For the sound absorption coefficient, the experiment gives the value between 0.70 and 0.80 for the frequency range of 1000 to 1800 Hz while the sound absorption coefficient obtained from simulation gives 0.7 to 0.85 for the frequency range of 500 to 2500 Hz. Transmission lost index gives an average of 20 dB for the panel. The results showed that the sound absorption coefficient obtained through both the experimental and simulation methods were comparable to those use commercially in the market such as rock wool and synthetic fibres.
  Semin , A.R. Ismail and T.F. Nugroho
  This study has been investigated the effect of diesel engine convert to sequential port injection dedicated CNG engine on the engine cylinder pressure performance. This research has using GT-Power computational engine model for steady-state and transient simulation and experimental investigation. The investigation and simulation of the engine cylinder pressure performance characteristic profile based on variation engine speed. The engine computational model and experimental has developed based from the diesel engine converted to port injection dedicated Compressed Natural Gas (CNG) engine spark ignition. The simulation and experimental results of cylinder pressure characteristics are shown the cylinder pressure profile and maximum cylinder pressure characteristics. The results shown that the conversion development has decreasing the engine cylinder pressure.
  A.R. Ismail , N. Jusoh , N.K. Makhtar , M.R. Daraham , M.R. Parimun and M.A. Husin
  This study highlight the assessment of environmental factors and comfort levels of a ventilated paint shop area. The study was carried out at an automotive components assembly factory. The environment examined was the relative humidity (%), air temperature ( °C) and CO2 (ppm) of the surrounding workstation area. The environmental factors were measured using thermal comfort apparatus, which is capable to measure simultaneously those mentioned environmental factors. The time series data of fluctuating level of factors were plotted to identify the significant changes of factors. Then the thermal comfort of the workers was assessed by using ISO Standard 7730 and thermal sensation scale by using Predicted Mean Vote (PMV). Further Predicted Percentage Dissatisfied (PPD) is used to estimate the thermal comfort satisfaction of the occupant. Finally the PMV and PPD were plotted to present the thermal comfort scenario of workers involved in related workstation. The thermal comfort assessment of this workplace which is warm following by thermal sensation and likely to be dissatisfied by the occupant. Finally, the outcomes of 7 surveys response to the environmental factor questions are discussed.
  A.R. Ismail , M.R.A. Mansor , M.F. M. Ali , S. Jaafar and M.S.N. M. Johar
  High quality kicking technique is the most important aspect of the soccer player. The good kicking technique will increase quality of the games. The study will focus on the biomechanics analysis of the national soccer players as well as identifying to their kicking action and technique using the instep kicking. The subject making the instep kicking by using the right leg. Data management and analysis were performed using Silicon Pro Coach and the statistical analysis carried out by using Minitab software. Image of instep kicking was captured during the study to obtain a visual of the kicking activity so that it can be analyzed. From that, the data for velocity, acceleration, angle of ankle and distance involved in kicking activity can be identified. Furthermore, the equation that relates with the variables were obtained through the ANOVA and regression model for each variable. Based on the findings, the velocity and distance was identified as significant to the force model. This study has shown that the highest average forces produced in force model analysis which using three step run. The highest average force is 5879.60 N, the highest average velocity is 8.2 m sec-1 ec with distance kick as much as 47.85 m and the multi linear model equation is y = - 18.1+711x1+0.146 x2+396x3.
  A.R. Ismail , M.Y.M. Yusof , K. Sopian , M.R.A. Rani , Z.K.M. Makhbul and N.K. Makhtar
  The objective of this study is to determine the optimum values of environmental factors such as relative humidity (%) and illuminance (lux), on the operators’ productivity at Malaysian automotive industry. Production of automotive parts is among the largest contributor to economic earnings in Malaysia. The dominant work involve in producing automotive part were manual assembly process. Where it is definitely used a manpower capability. Thus, the quality of the product heavily depends on worker’s comfort in the working condition. Humidity and illuminance level can give significant effect on the worker performance. Humidity level, illuminance level and productivity rate were observed in automotive factory. An automotive manufacturing firm was chosen to observe the relative humidity level, illuminance level and worker’s productivity rate. The data were analyzed using Artificial Neural Network's (ANN) analysis. Artificial Neural Network's (ANN) analysis technique is usual analysis method used to form the best linear relationship from the collected data. It is apparent from the linear relationship, that is the optimum value of production (value˜1) is attained when relative humidity is 54.86% RH and lighting value is 146.386 lux. Optimum value production rate (value˜1) for one manual production line in that particular company is successfully achieved. Through ANN's system, optimum environmental factor manage to be predicted.
  A.R. Ismail , M.Z. Nuawi , N.F. Kamaruddin and R.A. Bakar
  The purpose of this study was to evaluate and validate the Daily Exposure to Vibration A(8) and Vibration Dose Value (VDV) experienced by the car driver, with care taken to elucidate the effects of WBV on the human body and all at once to introduce a newly developed real-time WBV measurement instrumentation. Cars are one of the most important transportation worldwide. It plays a significant role for the human to travel from one place to the other places promptly. However, high magnitude Whole-Body Vibration (WBV) that can be associated with car may lead to various diseases and health problems, such as lower back pain, in humans. This study was conducted on a national car. The WBV exposure was measured for 10 min. Data was collected using an IEPE (ICPTM) accelerometer sensor connected to a DT9837 device, capable of effectively measuring and analyzing the vibrations. The vibration results were displayed on a personal computer using a custom Graphical User Interface (GUI). MATLAB software was used to interpret the results and determine the WBV exposure level. The values of Daily Exposure to Vibration A(8) and the Vibration Dose Value (VDV) during one stretch of car travel were measured as 0.8778 and 3.8862 m sec-1.75, respectively. The results here confirm that WBV absorbed by the human body increases with an increase in the duration and magnitude of vibration exposure by the driver, illustrated by the increase in the value of Daily Exposure to Vibration A(8) and the calculated Vibration Dose Value (VDV).
  A.R. Ismail , M.H. M. Haniff , B.M. Deros , M.R.A. Rani , Z.K.M. Makhbul and N.K. Makhtar
  The objective of this study was to determine the dominance effects of environmental factors such as Illuminance, humidity and WBGT on the operators’ productivity at Malaysian automotive industry. A case study was carried out at an automotive components assembly factory. The environmental factors examined were the Illuminance (lux), humidity and WBGT of the surrounding workstation area. Two sets of representative data including the illuminance, humidity and WBGT level and production rate were collected during the study. The production rate data were collected through observations and survey questionnaires while the illuminance level was measured using photometer model RS 180-7133, the humidity and WBGT level were measured by using quest temp thermal environment monitor. Taguchi Method was utilized to find the sequence of dominant factors that contributed to the productivity of operator at that specified production workstation. The study reveals that the dominant factor contributed to the productivity was illuminance, followed by humidity and WBGT.
  S. Omar , M.Z. Jaafar , A.R. Ismail and W.R.W. Sulaiman
  The natural pressure in hydrocarbon reservoirs is only sufficient in producing small amount of hydrocarbon at the end of the depletion stage. Therefore, in order to enhance or increase the hydrocarbon recovery, water or other fluids are injected into the formation to extract the hydrocarbon from the pore space. This common practice is known as Improved or Enhanced Oil Recovery (IOR or EOR). Foam is purposely used in some of the EOR displacement processes in order to control the mobility ratio, hence improving the volumetric sweep efficiency. The efficiency of a foam displacement process in EOR depends largely on the stability of the foam films. In laboratory, foam stability is usually measured through physical observation of the foam bubble in a glass tube. Unfortunately, this direct observation is not possible in the reservoir. Therefore, indirect measurement such as the measurement of electrokinetic signal would be a better alternative. This study aims to determine the correlation between the foam stability and the associated electrokinetic potential signals which resulted from the flowing fluid in Foam Assisted Water Alternate Gas (FAWAG) process. The investigation includes sample preparation, sample analysis, displacing fluid formation, rheological properties test, foam stability test and electrokinetic signal measurement by using NI Data Acquisition System (NIDAS). It is expected that the variations of foam bubble stability will change the pattern of the electrokinetic signals. The research findings could lead to a new approach in monitoring a FAWAG process. Application in the real field could benefit the oil and gas industry in term of making the EOR process more efficient and more economic.
  S.M.M. Anuar , M.Z. Jaafar , W.R.W. Sulaiman and A.R. Ismail
  Spontaneous Potential (SP) is commonly measured during reservoir characterization. The SP signals are also generated during hydrocarbon production due to the streaming potential occurrence. Measurement of streaming potential has been previously proposed to detect the water encroachment towards a production well. The objectives of this study are to quantify the magnitude of the SP signal during production by WAG injection and to investigate the possibility of using SP measurements to monitor the sweep efficiency. The peak of the signal corresponds to the waterfront, where there is a change of saturation from ionic water to non-polar hydrocarbon. Similar trend is predicted in the case of WAG, where we have several interfaces between the injected water and the injected gas. This project involves numerical modeling and experimental work. Results from the experimental work will be used in the simulation work to correlate the measured SP signals with the distance of the waterfront in the WAG process. These observations suggest that WAG displacement process can be monitored indirectly from the signal acquired. Water or gas override can be detected and controlled if wells were equipped with inflow-control valves. This study is significant because monitoring the progress of water and gas in a WAG process is key in the effectiveness of this enhanced oil recovery method. Measurement of the streaming potential provides another method besides using tracers to monitor the WAG profile. Better monitoring will lead to more efficient displacement and great benefits in term of economy and environment.
  S.R. Suradi , N.S. Mamat , M.Z. Jaafar , W.R.W. Sulaiman and A.R. Ismail
  Drilling of high angle, horizontal and other more complex trajectory wells are common strategies to economically produce hydrocarbon from the reservoirs. During directional drilling, hole cleaning is a vital aspect which needs to be monitored and controlled. For this purpose, foam-based mud using the Under Balanced Drilling technique (UBD) is employed to obtain a better cutting transport. Solid particle is one of the lubricating agents that is widely used in water-based mud. Previous studies have shown that microbeads could significantly reduce the friction in water-based mud. However, the application of polymer beads in foam-based mud is yet to be proven. Similar to the improvement in the water-based mud, it is expected that polymer beads such as Styrene Methacrylate could enhance the rheological properties of the foam-based mud. The polymer beads might significantly reduced the torque and drag by reducing the coefficient of friction of the foam-based mud. Polymeric particles could act as the foam or emulsion stabilizer which improved the stability of the foam. The half-life of the bubbles could be extended due to the addition of polymers. The fine sizes of the polymer beads were enhanced the stability of bubbles. Theoretically, the gas phase in the foam drilling mud was pulled the cuttings upward because of their buoyancy, thereby counteracting the gravity force. Therefore, the more stable the bubble in the foam drilling, the better the cuttings transportation will be. Introduction of polymer beads in the foam-based mud improved the foam stability. Reduction of the torque and drag force improved the carrying capacity of the cuttings in directional drilling. The suitable lubricating agent can reduce the drilling operation problems such as stuck-pipe. This will result in smooth drilling operation and great benefits in term of economy.
 
 
 
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