2016

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    Vibration analysis and effect of internal Stiffener on the structural response of Steel wind turbine tower
    (IUT, MCE, 2016-11-20) Islam, Md. Mirazul; Al Saeed, Abdullah
    In this paper, the structural response of steel tubular wind turbine towers with various design configuration is analyzed using FEM modeling. 50m tower with 3 different design option as follows: i) tower without stiffener, ii) tower with horizontal stiffening ring, iii) tower with vertical stiffener. The model of the towers are designed in SolidWorks. Von- Mises stress and total deflection of the tower are analyzed to identify more efficient design approach adopting internal stiffeners. Here we analyzed the mode shapes, natural frequencies and harmonic response of von-mises stress and total deflection by using ANSYS Workbench 14.5. The studied model ignored the mass of nacelle-rotor system and the wind turbines, namely, only the isolated tower was included. Actually we validate an existing paper where tower without stiffening ring and with stiffening ring are analyzed and here another design option has been analyzed in which vertical stiffeners are used instead of stiffener ring. Finally best design option will be selected based on strength of the tower and vibration analysis
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    Transitional change of conventional manufacturing system towards lean manufacturing system into the apparel manufacturing industry: a case study
    (IUT, MCE, 2016-11-20) Islam, Md. Aminul; Ashfaq, Shaikh
    Traditionally operated garment industries are facing problems like low productivity, longer production lead time, high rework and rejection, poor line balancing, low flexibility of style changeover etc. These problems were addressed in this study by the implementation of lean tools like cellular manufacturing, single piece flow, work standardization, just in time production etc. After implementation of lean tools, results observed were highly encouraging. Some of the key benefits entail production cycle time decreased, number of operators required to produce equal amount of garment is decreased, rework level reduced production lead time. Apart from these tangible benefits operator multi-skilling as well as the flexibility of style changeover has been improved. This study is conducted in the Cutting, Sewing and Finishing section in knitwear manufacturing company. Study includes time studies, the conversion of traditional batch production into single piece flow and long assembly line into small work cells
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    Study of the effect of external vibration on surface roughness after burnishing by a vibration assisted flexible burnishing tool
    (IUT, MCE, 2016-11-20) Rahman, Wahidur; Chowdhury, Asif Alam; Tousif, Rahat Latif
    Burnishing is a very simple and effective method for improvement in surface finish and can be carried out using existing machines, such as lathe. Quality of Surface is an important factor to decide the performance of a manufactured product. For better quality surface finish the main factor is surface roughness. On account of its high productivity, it saves also more on production costs. Moreover, the burnished surface has a high wear resistance and better fatigue life. The lower value of roughness gives higher surface finish for the manufacture red product. Now in present scenario different processes like grinding, honing, super finishing, polishing, burnishing, etc. are used to reduce the value of surface roughness. Burnishing is one of the process which majorly effect the surface roughness. The levels of input process parameters are selected on basis of one factor at a time. Experiment of depth of cut, burnishing feed, burnishing speed and number of process. Burnishing process has many advantages over the other finishing processes, the improvement of the surface roughness through the burnishing process generally ranged between 40% and 90% [11-13]. Compressive stresses are also induced in the surface layer, giving several improvements to mechanical properties. Burnishing can improve both the surface strength and roughness [14].
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    Redesigning of a warehouse facility layout for improving the inventory management system: a case study
    (IUT, MCE, 2016-11-20) Razee, Syed Muqsit
    Warehouse layout is a classical production problem in engineering environment. Warehouse design often has a significant impact on the performance of a manufacturing plant. In modifying the warehouse floor layout, main issue that needs to be concerned is the impact on system performance due to the changes made. Improvements in terms of time delays, frequency of material flows and efficiency of line will contribute to the reduction of production cost. Neither an algorithmic nor a procedural layout design approach is usually an effective way in solving a practical layout problem. This paper applied the simple procedural methodology for the generation of suggested system, namely Systematic Layout Planning (SLP) approach. This approach analyses the layout problems through the usage of easy understanding analytical tools. The suggested system focuses on the redesigning of the workstations for more visible value adding workstation arrangement in the warehouse. The system was evaluated through the line balancing issue and space distribution. Changing material handling equipment and space arrangement of all the equipment directly improves of flow within the warehouse. Implementation of a new layout is a time consuming process and a big investment is required for making the changes. Even no practical analysis is possible for observing the improvement(s) made, hence the improvement was proved through a heuristic way in this project
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    Productivity and quality enhancement through implementation of Total Productive Maintenance (TPM) in a manufacturing plant
    (IUT, MCE, 2016-11-20) Rashid, Md. Mynur; Alam, Rabiul
    Plant and equipment maintenance is a vital issue in manufacturing. The cost of regular maintenance might be low but the major breakdown of a machine can halt the entire production line. On the other hand effective machine maintenance would enable a plant to increase productivity, efficiency, quality operations, various flexibility, and responsive to customer service. Most importantly, this may prolong the life of machines. In order to measure performance of a maintenance system, the overall equipment effectiveness (OEE) is a summarized metric of several performance measures used to determine a machine’s or plant’s performance and its impact on productivity. The purpose of OEE is to assist an organization with improved productivity, reliability, maintainability for both short term and long term effectiveness, and low cost yet quality product at the best value. To evaluate the OEE, research framework has been designed through interview-for initial assessment, observation of shop floor, collecting breakdown and repair data and analyzing those with statistical tools. After the documentation and analysis of data, findings are represented in graphical forms such as Pareto chart, cause effect diagram, and process flow diagram. Very little research is conducted about Total Productive Maintenance (TPM) implementation Bangladeshi manufacturing plant; so this thesis going to add value to that cause. Bangladesh spends significant portion of foreign currency to import industrial machineries. Understanding the reasons of machine breakdowns, failures, quality defects, reduced speed, setup and adjustment losses are vital for plants. Actual capacity of production line can be enhanced by understanding the big losses and evaluating OEE. Otherwise to meet the extended demand of a product, a plant has to spend more money on buying new equipment. Many Japanese and the USA manufacturing plant incorporated TPM few decades ago but this practice seems to be absent here. Practical implication of this study is that manufacturing plants needs to improve its maintenance policy.
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    Study of environmental pollution by Petrol engines
    (IUT, MCE, 2016-11-20) Mohammed, Hammam Ali; Idris, Abdullahi; Mohammed, Abdallah
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    Optimization of surface roughness on aluminium milling operation by peltier cooling effect
    (IUT, MCE, 2016-11-20) Sanglap, Md. Tanzib Ehsan; Ahnaf, Md. Golam
    The ultimate goal in the manufacturing of a part is to achieve an economic production plan with precision and accuracy in the first attempt at machining. A physics-based comprehensive modelling of the machining processes is a fundamental requirement in identifying optimal cutting conditions which result in high productivity rates without violating accuracy throughout the part production process. As technology provides smaller devices with greater heat dissipation needs, cooling systems become essential during machining. The results of manufacturing processes, such as roughness structures on machined surfaces, now play a significant role in milling phenomena. The Main vision of this paper is to facilitate improved machinability that also constitute the reduction of surface roughness and decreasing the temperature at the cutting zone. The conventional milling, in both dry condition and cryogenic cooling that have a lack of getting a smooth surface as well as environmental purpose and costs. Thus for getting a complete cost effective and P a g e | 4 reliable solution, Peltier cooling effect is conducted for the analysis of the influence of the milling parameters on the surface roughness. This also helps to get improved chip formation and chip morphology. The optimum surface roughness obtained in both low and high RPM. In this paper the effect of cutting condition (cutting speed and feed rate) on surface roughness were studied and analyzed using Peltier cooling effect. And the results suggest that using Peltier cooling effect attains more realistic alternative to conventional coolants for milling applications that is not only reduces surface roughness of the machined surface, but also more eco-friendly, provides better chip formation and increases tool life.
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    Optimisation of Process Parameters using the Hybrid Algorithm of Artificial Bee Colony and Fuzzy Logic Controller
    (IUT, MCE, 2016-11-20) Islam, Madani; Rahman, Md. Rizwanur
    A hybrid Artificial Bee Colony (HABC) algorithm is proposed based on Fuzzy Inference System for solving fuzzy flexible real life optimisation problem. First, the Fuzzy Logic Control provides multiple parameters to an output of single parameter using the fuzzy logic membership function dependent on the input parameter characteristic and the fuzzy logic rules. Second, this single output from the fuzzy logic is optimised by ABC which utilises multiple strategies in a combined way to generate the initial solutions with certain quality. Third, the algorithm is verified in established set of data which demonstrated the effectiveness of the hybrid Algorithm
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    Investigation of Surface Roughness and Burr Height of Al/Al2O3/Gr Metal Matrix Composite for Various Drilling Parameters
    (IUT, MCE, 2016-11-20) Saadat, Sadman; Anan, Md. Abid Hasan
    Drilling is a simple and common metal removal process and is important for the final fabrication stage prior to application.This paper discusses the influence of cutting parameters on drilling characteristics of pure Aluminium (Al) plate and Aluminium (Al) metal matrix composites (MMCs) reinforced with 3wt% Graphite(Gr) and 5wt%, 10wt%, 15% Alumina (Al2O3). The composites are fabricated using stir casting method. The experiments were conducted to study the effect of spindle speed and feed rate on surface roughness and burr height using high speed steel twist drills of 12 mm diameter having various point angles and lip angles. The results reveal that the alumina- graphite reinforced composites have better surface finish and improved burr heights the than unreinforced sample. Decrement of surface roughness and burr height occur with the increment of the amount of reinforcement. The spindle speed and feed rate extensively affect the surface roughness and burr height of the drilled hole.
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    Investigation of microalgae biomass as a potential source of bio-fuel for Bangladesh
    (IUT, MCE, 2016-11-20) Bin Karim, Shabab; Ishmam, Shitab; Rahman, Wasel-Ur-
    Fossil fuel energy resources are unsustainable. World reserves are gradually depleting and the greenhouse gas emissions associated with their use are contributing to global warming. Therefore, there are vigorous research initiatives all aimed at developing alternative fuel resources that are both sustainable and carbon neutral. Based on contemporary research, third generation biofuels that are specifically derived from microalgae are considered to be a technically viable alternative energy resource that is free from the major problems associated with the use of fossil fuels. This project investigated the use of microalgae for biodiesel production, including their cultivation, harvesting, and processing. The microalgae species most suitable for biodiesel production in Bangladesh are mentioned as well.