Universiti Teknikal Malaysia Melaka: UTeM Open Journal System
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MATHEMATICAL MODELLING OF THE PASSIVE AND SEMI-ACTIVE AUTOMOBILE SUSPENSION SYSTEMS IN FORD SCORPIO CAR MODEL
Get PDFThe suspension is a system of spring or shock absorbers connecting the wheels and axles at the chassis of a vehicle. In this study, Ford Scorpio car with passive and semi-active suspension system are formulated using Second Order Differential Equations (ODE). These models were solved analytically using the undetermined coefficient and Cramer rule methods. The comparison between passive and semi-active suspension system also conducted to measure such as displacement, frequency and time by plotting graphs. The passive system resulted that a constant displacement roughly at 0.035 m while 0.025 m was obtained by a semi-active suspension system. Semi-active system took t = 1 s to yield a constant displacement while for the passive suspension system required t = 1.5 s. The comparison showed the semi-active results were better than a passive suspension system
Level Of Adoption Of Sustainability Practice Among Locally And Foreign Owned Construction Firm In Nigeria Delta
No full textThe quest to have sustainable development by different stakeholders in the construction industry cannot be overemphasised. Hence the aim of this research is to assess the level of adoption of sustainability practices among locally owned and foreign owned construction firms in Niger- Delta, Nigeria. Data were obtained using 1179 copies of structured questionnaire, administered through random sampling technique. The methods of data analysis were simple percentage, mean score and Mann- Whitney test. The average mean scores of 2.89 and 3.39 for locally and foreign owned construction firms respectively, indicate that the overall level of adoption of sustainability practices among locally and foreign owned firms is moderate. The P-value of 0.001 is less than 0.05 significance level, hence the hypothesis was rejected. This indicates that there is a significant difference in the level of adoption of sustainability practices among locally owned and foreign owned construction firms in Niger Delta, Nigeria. This study concluded that firms’ ownership has significant impact on the level of adoption of sustainability practices by the construction firms in Niger Delta. This study recommends government should pass into law, legislations that would encourage the adoption of sustainability practices by the construction firms in Niger - Delta, Nigeria. This study also recommends that construction firms should improve on their level of adoption of sustainability practices in Niger Delta by increasing top management support, human resource management, employee empowerment, training and educating employees on sustainability practices and increasing the amount of resources allocated to sustainability. Government should pass into law, legislation that would promote the interest of the government and the citizens in the Niger Delta, Nigeria. These Legislations would make the firms to improve their level of adoption of sustainability practice in Niger Delta, Nigeria
Exergo-economic analysis of performance of a gas turbine power generation system with a solar air preheater
Get PDFThe power generation sector, especially the gas turbine, is one of the most critical sources in order to eliminate greenhouse gases worldwide. In a thermodynamic system, exergo-economic analysis is utilized as a means to specify the inefficient thermo-dynamic points, where the highest loss ofexergy arises. In this paper, engineering equation solver (EES) software and exergo-economic analysis, which uses both the second-law of thermodynamics and economic principles, are utilized to evaluate the economical and exergetical performance of the gas turbine with solar air preheater. The gas turbine without preheating of the air entering the combustion chamber is first investigated.Then, based on three concepts including relative difference, exergo-economic coefficient and exergetic efficiency, a comparison study is performed between the gas turbine with and without solar air preheater. The results clearly reveal that by increasing the inlet temperature of the combustion chamber from 620˚K to 820˚K, the exergy factor increases from 0.41% to 0.68%. Also, the consumption of gas turbine with solar air preheater is reduced from 8.99 kg/s to 7.84 kg/s by raising the inlet temperature of the combustion chamber. As a result, it is noteworthy to express that the exergetic efficiency is increased from 58.4% to 63.4%
FUZZY LOGIC CONTROLLER FOR ACTIVE STEERING CONTROL SYSTEM
No full textThe aim of this study is to introduce a fuzzy logic controller for active steering control of a vehicle. A lot of unexpected events might occur on the road due to slippery road condition which can be considered as one of the major factors of accidents. Hence, a nonlinear fuzzy logic observer based active steering controller is proposed that will overcome the disturbances such as wet and icy road conditions and crosswind. The controller has proved that it can stabilize the steering wheel and reduce the time for system to achieve the steady state condition. In the simulations, comparisons are made between the uncontrolled output, Sliding Mode Control (SMC), Sliding Mode Observer Based Controller (SMCO) and Linear Quadratic Regulator (LQR). It can be seen that Fuzzy controller performance is comparable to SMCO but much better when compared to LQR
PEMBUDAYAAN KESUKARELAWANAN DALAM KALANGAN MASYARAKAT: SATU KAJIAN ULASAN SISTEMATIK
Get PDFArtikel ini disediakan bagi mengulas pembudayaan kesukarelawanan dalam kalangan masyarakat. Satu kajian ulasan sistematik telah dijalankan bagi mendapatkan maklumat lengkap berkaitan faktor pemangkin yang mendorong pembudayaan kesukarelawanan dalam kalangan masyarakat dengan menggunakan pangkalan data Elsevier dan Sage. Keputusan kajian menunjukkan bahawa faktor keperluan psikologi, faktor keperluan mendapatkan pengiktirafan dan ganjaran serta faktor pegangan agama menyumbang ke arah pembudayaan kesukarelawanan dalam kalangan masyarakat. Hasil kajian memberi implikasi terhadap keperluan pihak berkepentingan mengenai kepentingan budaya kesukarelawanan dalam usaha mencetus transformasi sosial serta mewujudkan anggota masyarakat yang penyayang, bertanggungjawab serta tidak mementingkan diri sendiri
Knowledge Of Ergonomics Among Technical Staff In University Technology Mara Penang Malaysia
Get PDFErgonomics is the scientific study of human work. Ergonomics knowledge helps in its right application and contributes significantly to the general wellbeing and safety worker’s at the workplace. Even though ergonomics in Malaysia was introduced in 1992, but it is a relatively new concept and yet to be considered an essential component of most enterprises. The aim of this study is to evaluate the level of ergonomics knowledge among technical staff in University Technology MARA (UiTM), Penang Malaysia. A questionnaire was developed and distributed to all technical staff of UiTM and the responses were analyzed using SPSS version 15. The evaluation showed that the score of average mean and standard deviation obtained are 3.16 and 0.96 respectively. The result shows that their level of ergonomic knowledge is moderate. The mean score obtained from the awareness of the effect if the ergonomics aspects are not practiced in the workplace is 4.37 which is a high level. It means that they don`t want to get injured and experience an unhealthy condition in the workplace. Regular ergonomic educations and practices in UiTM are advocated to increase ergonomics knowledge and practice to better leve
FACTORS INFLUENCING SELECTION OF LEAN TOOLS AND TECHNIQUES IN MALAYSIAN ORGANISATIONS
No full textThis paper attempts to evaluate 16 factors that should be considered when selecting lean tools and techniques. Lean tools and techniques are typically used to eliminate waste that are produced by defects, waiting time, overproduction, extra motion, extra processing, excess inventory, and unnecessary transportation. The study was conducted in the form of a survey, with data being gathered via purposive sampling. The respondents were chosen based on their involvement in the selection and/or implementation of lean tools and techniques in Malaysia organisations. The respondents were made of practitioners, managers, engineers, executives, consultants, and academics. The surveys indicated that there are ten factors with high agreement levels (>=4.00). These include: (1) Top management’s approval and support, (2) Possible benefits gained after implementation, (3) Aligned with the organisation’s vision, mission and purpose, (4) Aligned with the organisation’s strategic plan and goals, (5) Prove of benefits from other similar organisations, (6) Allocation of resources, (7) Workforce capability, (8) Suitable with the organisation’s culture, (9) Suitable with the organisation’s maturity level, and (10) Suitable with the customers’ and stakeholders’ expectations or requirements. It is hoped that this research will assist organisations in selecting the most appropriate lean tools and techniques to be used in waste reduction
Planning E-Marketplace Business Model for Vehicle Rent
Get PDFTechnological advances and the internet are utilized by businesses to run electronic commerce or e-commerce businesses. The increase in Internet users from year to year is very significant, so that the application or migration of business into e-commerce is considered a good opportunity for business people. But the demand of vehicle rental is increasing especially in Bali. However, there have not been many e-marketplace businesses with vehicle rental services as evidenced by the name of e-marketplace vehicle rentals that are still foreign to the ears of the people of Indonesia. This research objective is to analyze and find business target in vehicle rental e-marketplace, create business plan for vehicle rental e-marketplace and create prototype platform for vehicle rental e-marketplace. This research methodology is interview and questionnaires. This research resulting the business model for vehicle rental e-marketplace and prototype platform for vehicle rental e-marketplace
COMPUTER VISION FOR SPLENDID SQUID SIZE AND SPECIES CLASSIFICATION
Get PDFThai seafood industry relies heavily on labor intensive work, especially in a classification process. Classifying size and species of splendid squids can be exhausted and prone to errors. This study investigated approaches to automate size sorting of splendid squid and differentiating its species such as L.duvauceli and L.chinensis. Parameters extracted from squids’ images for example, area, width, length and constructive geometries were tested for their significance. As functions of these parameters, classifiers for grading size were developed based on regression analysis and neural network models; a discrimination analysis was employed in species sorting. Neural network at the accuracy of 92.67% was found to marginally outperform the regression model (88% accuracy) in size prediction; however, non-linear regression was recommended in practice due to its simplicity to apply. For species differentiation, the discrimination equation was as accurate as the crisp divider (width over length ratio) at approximately 90%. These computerized approaches in size and species classification were proven to be superior to manual practice; they can overcome limitations of work performance due to individual capability and ergonomic factors
HELICAL MICRO-HOLE DRILLING OF CHEMICALLY STRENGTHENED GLASS USING CAPSULE-SHAPED ELECTROPLATED DIAMOND TOOL
Get PDFThis study investigates the micro-hole drilling performance of chemically strengthened glass plate by using a capsule-shaped electroplated diamond tool and the helical drilling method. Three different helical pitch conditions were tested to drill holes with a diameter of 1 mm. The number of drilled holes, grinding force, and maximum crack size were measured along with the observation of the drilled holes to evaluate the performance of the micro-hole drilling. From the experimental results, it was found that as the size of helical pitch decreased, the number of drilled holes increases where the average grinding force generated becomes smaller. By using small helical pitch condition, 43 holes could be drilled but the maximum crack size generated at the outlet side of the drilled hole is not able to achieve the high-grade quality compared to the inlet side. The resultant grinding force generated when the tool tip nearing the outlet side of the glass plate has caused the large crack at a certain position on the outlet side