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Patakor F.A.,Politeknik Merlimau | Jantan N.,Politeknik Merlimau | Salleh Z.,Hang Tuah University | Sulaiman M.,Hang Tuah University
2016 8th Computer Science and Electronic Engineering Conference, CEEC 2016 - Conference Proceedings | Year: 2016

Sliding mode control offers great potential to deal with uncertainties such as parameter variation and external load disturbances in controlling induction motor drives. The main obstacle of conventional sliding mode control is the presence of chattering phenomenon. It is known that the large switching gain of sliding mode control is proportional to the chattering level, and normally a large switching gain is applied to handle the uncertainties. In this paper, this chattering phenomenon is significantly reduced by a newly developed algorithm. The control algorithm incorporates the adjustment of switching gain value and variation of the boundary layer to replace the discontinuous function in conventional sliding mode control. As a result, the boundary layer and the switching gain will change in the presence of uncertainties and load disturbances. The experimental results show the effectiveness of the proposed sliding mode control is superior in reducing the chattering phenomenon and handling the external load disturbances. © 2016 IEEE.


Salleh Z.,Hang Tuah University | Sulaiman M.,Hang Tuah University | Omar R.,Hang Tuah University | Patakor F.A.,Politeknik Merlimau
2016 8th Computer Science and Electronic Engineering Conference, CEEC 2016 - Conference Proceedings | Year: 2016

Recently, fuzzy logic controllers have been recognized in induction motor drives systems for their robust performance. Therefore, this paper presents a fuzzy logic (FL) control system based on FL approach for a vector controlled induction motor drives for high performance application. The analysis, design and simulation of the FL controller for vector control induction motor are carried out based on scaling factor and membership functions theory. First, the drives system was simulated with Standard Constant Parameter FL, Design Case Constant Parameter Fuzzy Logic and PI controller. Then the best performances of these controllers were compared to proposed optimized fuzzy logic controller (OFL). The OFL is done by tuning of scaling factor for the change in speed error, Gce to produce a better transient behaviour, and altering the width and moving the peak value positions of membership functions to improve control performance. The results show that the proposed OFL gives better performances in tracking performances and also load disturbances. The test is done in different operating conditions for half rated speed and full rated speed, half and full load condition. The results demonstrates the robustness and the effectiveness of OFL controller for high performance of induction motor drive system. © 2016 IEEE.


Rassiah K.,Politeknik Merlimau | Balakrishnan P.,Politeknik Merlimau | Haron K.,Politeknik Sultan Salahuddin Abdul Aziz Shah
Applied Mechanics and Materials | Year: 2014

Development of new natural fiber composite for a good characteristic is the focus of many studies, because of their cellulose contents make their properties more potential. However, the main challenge in the research on natural fiber/ polymer composites is their poor compatibility. Based on that, the comparison study by chemical treatment of sodium hydroxide (NaOH) method and adding wax has been explored in two different processes to improve the compatibility of the natural fiber surface. The sodium hydroxide (NaOH) treated sugarcane bagasse (SCB) and coconut coir wax (CCW) in low density polyethylene (LDPE) as a reinforced matrix in fact, will enhance the mechanical properties of the resulting composites. In this study, four different compositions of (90/2, 90/4, 90/6, 90/8), with additional of 2% of NaOH and 2-8% wax with sugarcane bagasse (SCB)/coconut coir respectively were tested. The specimens were analyzed by different techniques such as tensile test, hardness test, impact test and scanning electron microscopy (SEM) according to ASTM standard. This research has shown that the presence of NaOH indicates higher tensile strength and impact strength compared to coconut coir wax (CCW). While for the young modulus and hardness test value shows coconut coir wax (CCW) has increased and improved. The morphological analysis was conducted to determine the effects of natural fiber bonding between the matrix materials for broken specimens after mechanical testing. © (2014) Trans Tech Publications, Switzerland.


Ismail M.A.,University of New South Wales | Rashid F.A.,Politeknik Merlimau | Prasad D.,University of New South Wales
International Journal of Environmental, Cultural, Economic and Social Sustainability | Year: 2012

Green building assessments are part of the globally accepted climate change mitigation method. The Green Building Index for Residential New Construction (GBI-RNC) from Malaysia belongs to a cohort of similar assessment schemes that evaluate various types of buildings throughout the world. There are similarities between GBI-RNC and other schemes such as LEED for Homes (US) or CASBEE for Detached Houses (Japan) in the use of indicators to measure the environment, social and economic aspects of houses. In order to continually improve the implementation of GBI-RNC, the indicators used to rate Malaysian houses need to be analysed and revised. Hence, this study evaluated the indicators in GBI-RNC against three existing Malaysian green homes. These three case studies are the CETDEM Demonstration, Cool and Energy Efficient House in Petaling Jaya, the Smart and Cool Home in Semenyih and the CoolTek House in Melaka. From this study, it was found that 13 out of 33 indicators with a combined score of 52 out of 100 points have to be revised due to various incompatibilities against the case studies. It was also found that the total GBI-RNC scores did not represent the inherent green home credentials of the assessed case studies due to various reasons. It is hoped that this revelation would help GBI authors to tailor future upgrades of GBI-RNC to reflect real life situations. © Common Ground, Muhammad Azzam Ismail, Fahanim Abdul Rashid, Deo Prasad, All Rights Reserved.


Yuhazri M.Y.,Hang Tuah University | Jennise T.T.T.,Hang Tuah University | Sihombing H.,Hang Tuah University | Mohamad N.,Hang Tuah University | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

Moisture absorption is a very important factor in polymers and composite materials used for hull manufacture and stability in marine environment. High water absorption of the material will affects the mechanical properties and stability in composite. This research is carried out to study the feasibility of the gravity effects on curing position of the laminated composite structures to enhance the curing space needed. Vertical cured laminate having almost similar properties with common horizontal cured laminate able to save much space in composite industry. Horizontal cured laminates filled up spaces in which SMI lack of. Polyesters and E-glass fibers were used as the raw material in this research. Vacuum bagging technique was used to suck out the excess resin during lay-up to avoid any voids and air inside laminate and cured at different angle position in room temperature for 24 hours. Seven samples of laminated composite were fabricated and cut into specific dimension in accordance to ASTM standard. This paper will discuss about the investigation on the water absorption and thickness swelling of the thermosetting laminated composite by curing the laminate at different angle using vacuum bagging technique. From the testing, SN6 and SN7 shows to have good water resistant in physical properties. © (2014) Trans Tech Publications, Switzerland.


Jennise T.T.T.,Hang Tuah University | Yuhazri M.Y.,Hang Tuah University | Sihombing H.,Hang Tuah University | Mohamad N.,Hang Tuah University | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

Utilization of high tech engineering materials such as composites has been extensively applied in the industries of civil, mechanical and aerospace due to their favourable characteristic such as high stiffness to weight ratio, improve corrosion and environmental resistance and potential reduction of processing. This research is carried out to study the feasibility of laminated composite after cured at different angle due to gravity effects to enhance the curing space required. Vertically cured laminate having similar or improved properties with common horizontally cured laminate to save much space bringing huge advantage especially to the developing Small and Medium Industries/Entrepreneurs (SMI/E). The horizontal cured laminate composite no doubt will fill up the spaces which SMI/E lacks of. Polyester and E-type fiber glass were the main raw materials used in the research via vacuum bagging technique to drain out the excess resin applied as well as minimize the void or air in the laminated composite. The laminated composite fabricated is cured at different curing angle positions in room temperature for 24 hours under the gravity effects. Five samples were prepared according to the ASTM standard to undergo hardness test. From the testing, SN6 which cured at 75 ° had the closest hardness to the horizontal cured control sample. © (2014) Trans Tech Publications, Switzerland.


Mohammad N.F.,University Malaysia Perlis | Muhammed M.H.,University Malaysia Perlis | Zakaria Z.,University Malaysia Perlis | Abdullah A.A.,University Malaysia Perlis | Mohammad I.S.,Politeknik Merlimau
2012 International Conference on Biomedical Engineering, ICoBE 2012 | Year: 2012

This study aim to synthesize bioceramic from Paphia undulata shell by using dry technique in order to proposed new bioceramic for human bone repair application. The clam shells obtained from the fisherman of Kuala Perlis coast were turned into a fine powder using an agate mortar. Since the clam shells contain high percentage of calcium carbonate, calcium carbonate powder turned to calcium oxide (CaO) by a calcinations process and the calcined powder then mix with water to form calcium hydroxide. The crystalline phases of the mixtures were greatly dependent on the mixing ratio (wt %) of the calcium hydroxide to phosphoric acid. In a wide mixing ratio range of 11.1-11.3 wt%, hydroxyapatite were synthesized and palletized. All samples were sintered to determine most suitable sintering temperature to fabricate bioceramics for bone substitute materials. The composition of the samples had been analyzed by using X-ray diffractometry (XRD) spectroscopy. In addition, the mechanical properties of samples were characterized using compression test. The result obtained show hydroxyapatite was successfully produced with mixing ratio Ca/P is 11.2 wt% at 750C sintering temperature. © 2012 IEEE.


Mohammad N.F.,University Malaysia Perlis | Kanesvaran G.,University Malaysia Perlis | Othman S.M.,University Malaysia Perlis | Mohammad I.S.,Politeknik Merlimau
2012 International Conference on Biomedical Engineering, ICoBE 2012 | Year: 2012

The Malaysian cockle (Anadara granosa) shells have a potential to be used as bone filler and bone graft for non-load bearing bone application. In this project, the effect of particulate size on mechanical strength of Anadara granosa's bioceramic has been studied. The influences of particle size on mechanical strength are tested in order to determine the efficient particle size of Anadara granosa powders that suits the load bearing application of bone. Green bodies of Anadara granosa were prepared from Anadara granosa powders with different particles size (150, 300 and 600 m) and sintered at 700C. The morphological characteristic studied using scanning electron microscope (SEM) and the diametral tensile strength test was employed to characterize the effect of particulate size on the mechanical strength of Anadara granosa bioceramic. Result obtained shown that Anadara granosa bioceramic with intermediate particulate size and low porosity able to withstand high mechanical strength. Thus, it is suitable for cancellous bone substitute application. © 2012 IEEE.


Norhafizah M.,Politeknik Merlimau | Ramadhansyah P.J.,University of Technology Malaysia | Siti Nur Amiera J.,University of Technology Malaysia | Nurfatin Aqeela M.,University of Technology Malaysia | And 3 more authors.
Jurnal Teknologi | Year: 2016

This paper presents the results of an investigation carried out on the properties of porous asphalt mixture that are prepared by using granite aggregate and coconut shell. Four coconut shells (CS) as substitutes for conventional coarse aggregate were considered in the study: 0%, 10%, 30%, and 50% by weight of volume. The porous asphalt properties are characterized by voids in total mix, voids in filled bitumen, stability, abrasion loss, binder drainage, and permeability. In addition, the noise reductions of porous asphalt mixture were identified through impedance tube test. The results of the tests showed that coconut shell cannot be satisfactorily used as an aggregate replacement material in order to increases the properties of porous asphalt. However, in comparison between coconut shell replacement levels, 10% CS showed excellent performance. On the other hand, the incorporation of coconut shell in porous asphalt mixture has significantly reduces the traffic noise coefficient. © 2016 Penerbit UTM Press. All rights reserved.


Kamarudin M.H.,Politeknik Merlimau | Saringat M.S.,Politeknik Merlimau | Sulaiman N.H.,Politeknik Merlimau
Jurnal Teknologi | Year: 2016

This study about laminated bamboo strip from gigantochloa levis type mixed with epoxy composite. Due to the existence of demand for products that are comfortable, healthy and environmentally friendly, this research has focused on the use of renewable sources that is bamboo. Bamboos are some of fastest growing plant in the world and also have a higher compressive strength than wood, brick or concrete and a tensile strength that rivals steel. Certain species of bamboo can grow 35 inchies within 24 hour period, at a rate of 3 cm/h. That means bamboos can growth of approximately 1 mm every 2 minutes. In this study, the bamboo strip reinforced with epoxy was processed through hand lay-out method. Bamboo strips are combined with epoxy for a total sample thickness of 3 mm. This study is performed using the impact test that is Charpy (ASTM D-6110) and Izod (ASTM D-256) to measure the mechanical properties of energy absorbtion, followed by hardness test (ASTM D-1037). The 0, 60 and 90 degree of laminated bamboo strip epoxy composite with two types of load 7 kg and 14 kg has been tested. It is found that the 0 degree specimen Charpy test give the best value is 4.79 Joule energy absorbtion for 14 kg load. While for the Izod test, the best composition is also 0 degree with 4.51 Joule energy absorbtion for 14 kg load. It is shown that when the degree of bamboo laminate configuration increases, the impact absorbtion decrease. The result also shown that, when the load is increase the impact also increases. It means that got relative significant between bamboo strip configuration and load. The impact properties relate to the loading weight. The hardness test also shown that the laminated bamboo strip for 14 kg load resulting 91 rating, that is more higher than 7 kg load that is 84. It is shown that more loads will result more hardness rating for the laminated bamboo strip. © 2016 Penerbit UPSI Press. All rights reserved.

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