Universiti Teknikal Malaysia Melaka: UTeM Open Journal System
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APPLICATION OF FUZZY VIKOR IN AUTOMOTIVE BRAKE PAD MATERIAL
Get PDFMulti Criteria Decision Making methods is one of the most common methods used to determine the most appropriate material. In the decision making process, there are dissimilarities to elicit, specify and analyse the information on alternatives, criteria and relative significance of the criteria. Fuzzy set has been utilised in Multi Criteria Decision Making methods to optimise the method and created an extended approach to deal with uncertainty and increase the accuracy of decision making. As for many years’ asbestos was viewed as having an optimal performance as a brake pad. However, this material has been banned by the Environmental Protection Agency. Due to the increasing awareness on environmental impact and subsequently the need towards sustainability, selection of the appropriate material for a brake pad that complies with the environment and regulations is vital and natural fibre reinforced composite has potential to replace the asbestos in the automotive brake pad application. Therefore, the objective of this study is to apply the Fuzzy VIKOR to select the best natural fibre reinforced composite for the automotive brake pad to replace the asbestos. Four alternatives of natural fibre reinforced composite with five criteria have been evaluated by three decision maker. The results of the Fuzzy VIKOR shows that the date palm fibre is selected as the best material for the automotive brake pad
PERANAN FAKTOR AGAMA DALAM MEMBENTUK ETIKA JURUTERA (The Roles of Religious Factors in Shaping Engineer’s Ethics)
Get PDFSumbangan profesion kejuruteraan terhadap kemajuan negara amat besar terutama dalam aspek pembangunan dan kesejahteraan hidup masyarakat. Kajian ini bertujuan untuk mengenal pasti peranan faktor agama dalam mempengaruhi pembentukan etika jurutera di Malaysia. Kajian ini dijalankan dengan melakukan kajian tinjauan terhadap 376 orang jurutera dalam pelbagai bidang kejuruteraan termasuk bidang elektrikal, mekanikal, pembuatan dan awam dengan menggunakan kaedah persampelan kebarangkalian berstrata. Pengkaji juga menggunakan kajian deskriptif untuk mengukur tahap peranan agama dalam membentuk etka jurutera. Data yang dikumpul digredkan melalui pakej statistik iaitu Statistical Package for Social Science (SPSS 20.0). Data kajian dianalisis menggunakan 5 skala Likert. Statistik yang digunakan dalam analisis deskriptif ialah min, mod, median, peratus dan sisih piawai. Penemuan kajian ini mengesahkan faktor agama signifikan dalam mempengaruhi pembentukan etika jurutera. Di harap kajian ini dapat menyumbang idea baru kepada para akademia dan penggubal dasar dalam usaha menerapkan pengetahuan, kesedaran agama dan nilai etika kepada jurutera dalam usaha memartabatkan profesion kejuruteraan. Kata Kunci: agama, etika, jurutera The contribution of engineering profession to a nation is great especially for the society’s development and well being. This paper was to indentify the roles of religious factors in influencing the ethics among engineers in Malaysia. A study was conducted using questionnaire of 5 likert scales. 376 engineers from various fields such as electrical, mechanical, manufacturing and others were selected through stratified probability sampling. Descriptive anylysis using SPSS was also used. The findings showed that religious factors were significant in influencing engineer’s ethics. The study is benefical for academics and policy E-ISSN: 2289-8115 ISSN: 1985-7012 Vol. 12 No. 1 January - June 2019 82 makers in instilling knowledge, religious awareness and ethical values among engineers in order to enhance the image of engineering profession. Keywords: religious, ethics, enginee
Effect Of Annealing On Machinability Of Grey Cast Iron
No full textThis study investigates the influence of process parameter on machined cast iron under varying material strength and cutting conditions. The three process parameters considered in this study are spindle speed, feed rate and depth of cut. The cast iron bars were annealed and machined under both wet and dry cutting conditions. The signal-to-noise (S/N) ratio was used to analyze results generated, identify optimal process parameters (factors) and analyze the effect of these parameters on tool-tip temperature. Taguchi design of Minitab 18 was employed to optimize and analyze results. Results shows that the spindle speed was the most significant factor affecting tool-tip temperature reduction, followed by feed rate, while the depth of cut has least role to play on tool-tip temperature. Depth of cut and spindle speed both significantly influenced increment in material removal rate. The annealed cast iron bar had a better surface integrity than the Unannealed sample bars. Conclusively, the preferred condition for machining grey cast iron bar was annealed and wet machining condition
Design of Electro-Pneumatic Exoskeleton Robot for Upper Limb Actuation
Get PDFMost of tasks in daily activities are performed by upper-limbs. Physically weak persons such us elderly, injured or disabled person need to perform most of the daily activities with the help of exoskeleton robot. Therefore, various kind of exoskeleton robots have been developed in order to assist the physically weak person in their daily life. The current existing researches related to exoskeleton robot need to solve problems that related to suitable materials which is light and strong and also to work on the portable power supply that could power up the system for a long time independently. The proposed of this research project is to develop an electro-pneumatic powered shoulder orthosis for flexion motion only. This electro-pneumatic powered shoulder orthosis is actuated by a pneumatic cylinder which is placed at the backpack.For technical simplicity, this shoulder orthosis used an external power supply unit. performance analysis is carried out in terms of payload test. This shoulder orthosis need to lift up load (1kg, 2kg, 3kg, 4kg and 5kg) on 45o flexion motion. For each load, this shoulder orthosis need to repeat the test for three times. The time for each complete flexion motion is recorded. All the data is recorded in tables and presented in graphs. It is found from the experiments that the time taken for the cylinder to complete the flexion motion is increasing with load. This is because the cylinder needs to overcome the load as well as the gravitational force in order to complete the 45o flexion motion. As for the velocity, it is decreasing with the increasing of load. This is because, as the load increases, the cylinder becomes slower and it takes some time to complete the flexion motion
A DATA-DRIVEN PID CONTROLLER FOR FLEXIBLE JOINT MANIPULATOR USING NORMALIZED SIMULTANEOUS PERTURBATION STOCHASTIC APPROXIMATION
Get PDFThis paper presents a data-driven PID controller based on Normalized Simultaneous Perturbation Stochastic Approximation (SPSA). Initially, an unstable convergence of conventional SPSA is illustrated, which motivate us to introduce its improved version. The unstable convergence always happened in the data-driven controller tuning, when the closed-loop control system became unstable. In the case of flexible joint manipulator, it will exhibit unstable tip angular position with high magnitude of vibration. Here, the conventional SPSA is modified by introducing a normalized gradient approximation to update the design variable. To be more specific, each measurement of the cost function from the perturbations is normalized to the maximum cost function measurement at the current iteration. As a result, this improvement is expected to avoid the updated control parameter from producing an unstable control performance. The effectiveness of the normalized SPSA is tested to the data-driven PID control scheme of a flexible joint plant. The simulation result shows that the data-driven controller tuning using the normalized SPSA is able to provide a stable convergence with 76.68 % improvement in average cost function. Moreover, it also exhibits lower average and best values for both norms of error and input performances as compared to the existing modified SPSA.A DATA-DRIVEN PID CONTROLLER FOR FLEXIBLE JOINT MANIPULATOR USING NORMALIZED SIMULTANEOUS PERTURBATION STOCHASTIC APPROXIMATIO
Development of Mini Generator based on Wind Turbine Principle
Get PDFShortage of resources to generate electricity is one of the big issue nowadays. Recently, in Malaysia, electricity is generated from fossil fuels and water flow pressure. However, fossil fuels are facing extinction problem due to the limited production of these sources while flow pressure water also has limitation to supply electricity energy to the residents. Besides, the usage of fossil as energy resources affect the environment. Thus, this research proposed a mini wind turbine as an alternative source to generate electricity for consumer daily usage. The designed generator is developed with different number of blades and the operation is implemented by using arduino. The analysis of the effectiveness of the designed system is measured through different evaluation of produced voltage based on different number of fan blades and wind speed. The result shows that for ideal and simple wind turbine structure, the increment of rotational speed produced higher voltage and current. Thus, the system can be used an alternative source of electricity generator for small-scale individual user
A COMPARATIVE STUDY OF RTV-225 SILICONE ELASTOMER AND NATURAL RUBBER BASED THERMO-ELASTOMER FOR SOFT ROBOTIC APPLICATIONS
No full textLeveraging on material compliance, soft robots of today are mostly fabricated using silicone elastomers with reported long curing times. Hence, this opens possibilities to explore new materials for fabrication. In this paper, a recently patented natural rubber thermo-plastic elastomer (NRTE) is presented in comparison to RTV-225 silicone elastomer. NRTE inherits a mix of elasto-plastic behavior with ability to be easily formed by heating. Under normal operating conditions, it shows a unique self-healing-like behavior that allows multiple times of reuse. The post processing takes less than 2 minutes to cure. This reduces time to fabricate CiSS and CbSS soft structures. Mechanical properties of both elastomers are reported and compared by performing a tensile strength test. Additionally, this study presents design, fabrication, and testing of CiSS and CbSS simple soft structures which are made of NRTE and RTV-225 elastomers. The results reveal that NRTE has a potential to be used in prototyping of soft robotic structures
A Review: Adoption Implementation of E-Procurement in Organization
Get PDFAbstract— Electronic procurement or E-Procurement is a method for requisition for goods and services in organization throughout the internet. An E-Procurement is a part of the supply chain and its enables suppliers to sell their products and services. This study will identify factor influence the E-Procurement in an organization. Findings of this study demonstrate most organization responds agreed to implementation of E-Procurement in their business transaction towards give positive impact into organization. E-Procurement as useful tool to improve their selling efficiency, simplify their selling process, increase their administrative saving, increase their job performance and job productivity and improve their management system. In another view in this study, it has been noticed that in the present business condition, clients are demanding for better value in their investment. The utilization of E-Procurement demonstrates that implementation of E-procurement in organization currently endeavoring to address the clients’ needs
Understanding The Role of Khalifa for the Foundation of Wizard Khalifa Tourism
Get PDFBranding has helped Malaysian tourism industry moving forward in this highly competitive world. Till now these Malaysian brands such as Malaysia Truly Asia or Muslim friendly country or Halal friendly country are still relevant but a new perspective toward Malaysia is a need. Thus, this research aimed to offer a new approach of tourism branding that would put Malaysian in the map of the world again. This new approach of branding is a concept of Wizard Khalifa Tourism (WKT). It was introduced to relook philosophically at the role of mankind that man is not a lord on earth but merely as a tourist in this world. In order to be the wizard khalifa tourist, he or she must return to the purpose of man’s creation on earth, as demanded by Allah; the role of khalifa or a vicegerent man. Then, when men have retrieved the understanding of the purpose of their existence in this world; later on, they would act to benefit other helixes in this world in general and in the world of tourism, in specific aspect
Linearization - Advantages and Shortcomings Toward Control System Design
Get PDFThis brief manuscript discusses the necessity to linearize nonlinear systems. Thorough review on nonlinear phenomena in dynamical and numerical system is presented. The methodology to linearize nonlinear system in Jacobian approach is shown in didactic manner. Numerical and dynamical example of nonlinear system is provided to enhance understanding. Afterward, the comparison between both linearized and non-linearized system is literally discussed. The outcomes concluded that linearization process is a linear approximation of a nonlinear system that is only valid in a small region around an operating point.