The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Yilmaz Ozcelik - One of the best experts on this subject based on the ideXlab platform.
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Predicting the Building Stone Cutting Rate Based on Rock Properties and Device Pullback Amperage in Quarries Using M5P Model Tree
Geotechnical and Geological Engineering, 2017Co-Authors: S. Najmedin Almasi, Reza Mikaeil, Yilmaz Ozcelik, Reza Bagherpour, Hamid KalhoriAbstract:One of the key parameters that affect the selection of equipment and the cost estimation of dimension stone quarries is the rock cutting rate or production rate. In this study, the M5P tree algorithm is used to determine the relationship between the hard rock sawability and its factors especially the physical and mechanical characteristics of rock. To achieve the research goal, a variety of eleven types of hard dimension stone were selected and nine major physical and mechanical characteristics of rock including uniaxial compressive strength, Young’s modulus, Brazilian tensile strength, equivalent quarts content, grain size, Mohs hardness, point load test, density and P-wave velocity of these samples were evaluated. The cutting rate of diamond wire for all of the Workpiece was measured at different pullback amperage with a fully instrumented cutting platform in laboratory. All operational parameters of cutting process were entirely controlled. Thus, a database containing 99 datasets was provided and it has been used for analyses. The obtained results from the pruned and unpruned tree models showed a significant relationship between cutting rate and its factors. In the end, the results of M5P tree method were compared with statistical analyses (i.e., linear and nonlinear regression). The coefficient of determination be equal with 0.92, 0.86, 0.77 and 0.63 for unpruned tree, pruned tree, linear and nonlinear regression method respectively. This comparison showed that the both method of M5P tree technique have a better performance in predicting the cutting rate rather than the statistical regression methods.
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developing a new rock classification based on the abrasiveness hardness and toughness of rocks and pa for the prediction of hard dimension stone sawability in quarrying
Geosystem Engineering, 2017Co-Authors: Najmedin S Almasi, Reza Mikaeil, Reza Bagherpour, Yilmaz OzcelikAbstract:AbstractPredicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wire saw (DWS) as main performance criteria. For this purpose, a classification system for ranking the sawability of hard dimension stone based on the toughness, abrasiveness, and hardness of rock was initially developed, and a Hard Dimension Stone Sawability index (HDSSi) was defined. Then, by means of multiple curvilinear regression analysis, the data were analyzed and the relationship between the cutting rate with the HDSSi, and pullback amperage was obtained with a high correlation coefficient (.846) in data training, and .801 in data test. Validation of the model was carried out by considering the t-test, F-test, and the coefficient of determination. During this research, varieties of 11 types of hard rock were cut in a laboratory using a DWS and a fully instrumented cutting platform at different pull...
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developing a new rock classification based on the abrasiveness hardness and toughness of rocks and pa for the prediction of hard dimension stone sawability in quarrying
Geosystem Engineering, 2017Co-Authors: Najmedin S Almasi, Reza Mikaeil, Reza Bagherpour, Yilmaz OzcelikAbstract:Predicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wi...
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statistical and microscopic investigation of disc segment wear related to sawing ankara andesites
International Journal of Rock Mechanics and Mining Sciences, 2003Co-Authors: A S Eyuboglu, Yilmaz Ozcelik, Seyfi Kulaksiz, I C EnginAbstract:Despite the advancement in the technology, and the introduction of many synthetic materials, hard rock still keeps its vital importance in daily constructive and decorative consumption. The hard rock processing sector has shown a rapid development since 1930. Turkey has also been affected by this development and many numbers of hard rock processing factories have been established in the last 15 years. The import of basic machines, equipment and consumables in these factories constitutes a major economic problem in this sector. Disc consumption is the most important economic expenditure during the processing of hard rocks. Unsuitable manufacturing of discs and inappropriate adjustment of machine parameters to the rocks to be cut, causes the discs to deteriorate rapidly, leading to eventual economic loss [1]. The circular diamond saw blade contains a steel core which has diamond impregnated segments brazed on the periphery (Fig. 1). The segments (metal bonds) have two basic functions. These are to hold the diamond tight and to erode at a rate compatible with the diamond loss. Due to a large variety of sawing conditions many metal matrix compositions are in general use. Bonds based on copper, various bronze compositions, and on cobalt, tungsten, and tungsten carbide as well as combinations thereof cover a wide range of stone sawing applications. Sometimes small additions of iron, nickel, etc. are made to aid the manufacturing process or in the belief that the addition improves diamond retention or matrix wear properties; however, the complexity of compositions encountered in production practice, which in same cases comprise seven components, makes a scientific approach to the total problem extremely difficult or even impossible [2]. In general, many factors affect the stone cutting by a circular saw blade. These factors can be written in three groups (as shown in Table 1) [3]. The first important factor is the engineering properties of the material. The clue of the suitable values of parameters to reach the effective result is constant parameters. The physico-mechanical, mineralogical and petrographical properties must be analyzed before the sawing test and these results must be used in the producing part of the segment and saw blade. The performance of the sawing with a disc cutter is affected by diamond type, the size of diamond, the concentration of diamond and the properties of the metal bond (matrix). In general, the diamond crystals must have sufficent strength to withstand the repeated cutting forces during the granite sawing process. If the diamond is too weak in strength, it will easily produce macro-cracks and crushed particles. It will also cause the blade to act hard so that possibly glazing will occur. Conservely, if the diamond has very high strength and toughness, it will be difficult to fracture it to produce new cutting points and edges. In addition, it will be polished to give the blade a glazed appearance. The choice of the optimum diamond type for a given application depends on many factors, such as the stone type, the cutting conditions, the type and the quality of the machine, etc. [4]. Luo and Liao [4] report that various studies have been conducted to investigate the effects of the diamond type and size of wear and sawability in the processing of stone with diamond saw-blades. Jennings and Wright [5] stated that hard materials usually require a smaller size diamond than do softer stones because the load per particle is not sufficiently high and greater clearence is required for swarf. Conversely, if large diamond grits are used on hard materials, the penetration of the *Corresponding author. Department of Applied Science, University of Arkansas at Little Rock, Arkansas 72204, USA. Fax: +1-501-5698020. E-mail address: aseyuboglu@ualr.edu (A.S. Eyuboglu).
Reza Mikaeil - One of the best experts on this subject based on the ideXlab platform.
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performance prediction of circular saw machine using imperialist competitive algorithm and fuzzy clustering technique
Neural Computing and Applications, 2018Co-Authors: Reza Mikaeil, Sina Shaffiee Haghshenas, Mohammad AtaeiAbstract:The purpose of this study is the application of meta-heuristic algorithms and fuzzy logic in the optimization and clustering to predict the sawability of dimension stone. Survey and classification of dimension stones based on their physical and mechanical properties can be so impressive in the optimization of machine applications that are in this industry such as circular diamond saw block cutting machine. In this paper, physical and mechanical properties were obtained from laboratory testing on dimension stone block samples collected from 12 quarries located in Iran and their results were optimized and classified by one of the strongest meta-heuristic algorithms and fuzzy clustering technique. The clustering of dimension stone was determined by Lloyd’s algorithm (k-means clustering) based on imperialist competitive algorithm and fuzzy C-mean by MATLAB software. The hourly production rate of each studied dimension stones was considered as a criterion to evaluate the clustering efficacy. The results of this study showed that the Imperialist Competitive algorithm and fuzzy C-mean are very suitable for clustering with respect to the physical and mechanical properties of the dimension stone, and the results obtained showed the superiority of the ICA.
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Predicting the Building Stone Cutting Rate Based on Rock Properties and Device Pullback Amperage in Quarries Using M5P Model Tree
Geotechnical and Geological Engineering, 2017Co-Authors: S. Najmedin Almasi, Reza Mikaeil, Yilmaz Ozcelik, Reza Bagherpour, Hamid KalhoriAbstract:One of the key parameters that affect the selection of equipment and the cost estimation of dimension stone quarries is the rock cutting rate or production rate. In this study, the M5P tree algorithm is used to determine the relationship between the hard rock sawability and its factors especially the physical and mechanical characteristics of rock. To achieve the research goal, a variety of eleven types of hard dimension stone were selected and nine major physical and mechanical characteristics of rock including uniaxial compressive strength, Young’s modulus, Brazilian tensile strength, equivalent quarts content, grain size, Mohs hardness, point load test, density and P-wave velocity of these samples were evaluated. The cutting rate of diamond wire for all of the Workpiece was measured at different pullback amperage with a fully instrumented cutting platform in laboratory. All operational parameters of cutting process were entirely controlled. Thus, a database containing 99 datasets was provided and it has been used for analyses. The obtained results from the pruned and unpruned tree models showed a significant relationship between cutting rate and its factors. In the end, the results of M5P tree method were compared with statistical analyses (i.e., linear and nonlinear regression). The coefficient of determination be equal with 0.92, 0.86, 0.77 and 0.63 for unpruned tree, pruned tree, linear and nonlinear regression method respectively. This comparison showed that the both method of M5P tree technique have a better performance in predicting the cutting rate rather than the statistical regression methods.
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developing a new rock classification based on the abrasiveness hardness and toughness of rocks and pa for the prediction of hard dimension stone sawability in quarrying
Geosystem Engineering, 2017Co-Authors: Najmedin S Almasi, Reza Mikaeil, Reza Bagherpour, Yilmaz OzcelikAbstract:AbstractPredicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wire saw (DWS) as main performance criteria. For this purpose, a classification system for ranking the sawability of hard dimension stone based on the toughness, abrasiveness, and hardness of rock was initially developed, and a Hard Dimension Stone Sawability index (HDSSi) was defined. Then, by means of multiple curvilinear regression analysis, the data were analyzed and the relationship between the cutting rate with the HDSSi, and pullback amperage was obtained with a high correlation coefficient (.846) in data training, and .801 in data test. Validation of the model was carried out by considering the t-test, F-test, and the coefficient of determination. During this research, varieties of 11 types of hard rock were cut in a laboratory using a DWS and a fully instrumented cutting platform at different pull...
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developing a new rock classification based on the abrasiveness hardness and toughness of rocks and pa for the prediction of hard dimension stone sawability in quarrying
Geosystem Engineering, 2017Co-Authors: Najmedin S Almasi, Reza Mikaeil, Reza Bagherpour, Yilmaz OzcelikAbstract:Predicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wi...
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ranking sawability of dimension stone using promethee method
Journal of Mining and Environment, 2015Co-Authors: Reza Mikaeil, Abdollahi M Kamran, Golsa Sadegheslam, Mohammad AtaeiAbstract:Predicting the sawability of the dimension stone is one of the most important factors involved in production planning. Moreover, this factor can be used as an important criterion in the cost estimation and planning of the stone plants. The main purpose for carrying out this work was to rank the sawability of the dimension stone using the PROMETHEE method. In this research work, four important physical and mechanical properties of rocks including the uniaxial compressive strength, Schmiazek F-abrasivity, mohs hardness, and Young's modulus were evaluated as the criteria. During the research process, two groups of dimension stones were selected and analyzed. The rock samples were collected from a number of Iranian factories for the laboratory tests. The production rate of each sawn stone was selected to verify the proposed sawability ranking method. The results obtained showed that the new ranking method can be reliably used for evaluating the sawability of the dimension stone at any stone factory with different rocks only by the physical and mechanical properties testing.
Esra Zeynep Yildiz - One of the best experts on this subject based on the ideXlab platform.
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subjective and objective evaluation of the handle properties of shirt fabric fused with different woven interlinings farkli dokuma telalar ile birleştirilmiş gomleklik kumaşin tutumunun subjektif ve objektif olarak değerlendirilmesi
2014Co-Authors: Esra Zeynep YildizAbstract:Interlining is a layer of knitted, woven or non-woven fabric placed between the garment fabrics and facing to reinforce, to give form and to prevent stretching. Although interlining is an invisible interior part of a garment, the interlining construction and the fusion process of interlining and shell fabric affect Sewability, appearance, durability, handle and mechanical properties of the garment. In this study, the handle properties of a woven fabric fused with 6 different woven fusible interlinings that are usually used for manufacturing of shirts were examined by subjective and objective methods. The aim of this paper is to research the effects of different woven interlinings to the handle properties of shirt fabric.
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a study about the effects of interlinings to Sewability properties of the woven fabrics
Tekstil Ve Konfeksiyon, 2011Co-Authors: Esra Zeynep Yildiz, Oktay Pamuk, Ziynet OndoganAbstract:Tela, dayanimi desteklemek, form kazandirmak ve esnekligi onlemek amaciyla, giysi kumasi ile astar arasinda yer alan, orme, dokuma veya dokusuz yuzey kumaslardan elde edilen bir ara katmandir. Genellikle patlarda, yakalarda, mansetlerde, kemerlerde ve cep kapaklarinda kullanilmaktadir. Bu calismada, gomlek uretiminde yaygin olarak kullanilan kumaslar ve telalar arastirilmistir. Ayni konstruksiyona fakat farkli gramajlara sahip 3 dokuma kumas ile 4 dokuma tela belirlenmistir. L&M Dikilebilirlik Test Cihazi kullanilarak farkli dokuma telalar ile islem goren farkli dokuma kumaslarin dikilebilirlik ozelliklerinin incelenmesi amaclanmistir. Elde edilen bulgular igne batis kuvveti, kumas birim agirligi ve kumas kalinlik degerleriyle iliskilendirilmistir. Kumas birim agirligi ve kalinligi arttikca, kumasin dikilebilirlige karsi gosterdigi direncin arttigi ortaya konmustur
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a study about the effects of interlinings to Sewability properties of the woven fabrics telanin dokuma kumaşlarin dikilebilirlik ozelliklerine etkisi uzerine bir calişma
2011Co-Authors: Esra Zeynep Yildiz, Oktay PamukAbstract:Interlining is a layer of knitted, woven or non-woven fabric placed between the garment fabrics and facing to reinforce, to give form and to prevent stretching. They are usually used for collars, cuffs, waistbands, pocket flaps and plackets. In this study, the woven fabrics and the woven interlinings that are usually used for shirts manufacturing were examined. 4 woven interlinings and 3 woven fabrics, that have same constructions but different weights were determined. The aim of this paper is to research Sewability properties of different woven fabrics fused with different woven interlinings by using the L&M Sewability Tester. The findings were associated with the penetration force, fabric unit weight and fabric thickness. It was found that when the weight and thickness level of fabrics increase, the resistance to Sewability increases, too.
Reza Bagherpour - One of the best experts on this subject based on the ideXlab platform.
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Predicting the Building Stone Cutting Rate Based on Rock Properties and Device Pullback Amperage in Quarries Using M5P Model Tree
Geotechnical and Geological Engineering, 2017Co-Authors: S. Najmedin Almasi, Reza Mikaeil, Yilmaz Ozcelik, Reza Bagherpour, Hamid KalhoriAbstract:One of the key parameters that affect the selection of equipment and the cost estimation of dimension stone quarries is the rock cutting rate or production rate. In this study, the M5P tree algorithm is used to determine the relationship between the hard rock sawability and its factors especially the physical and mechanical characteristics of rock. To achieve the research goal, a variety of eleven types of hard dimension stone were selected and nine major physical and mechanical characteristics of rock including uniaxial compressive strength, Young’s modulus, Brazilian tensile strength, equivalent quarts content, grain size, Mohs hardness, point load test, density and P-wave velocity of these samples were evaluated. The cutting rate of diamond wire for all of the Workpiece was measured at different pullback amperage with a fully instrumented cutting platform in laboratory. All operational parameters of cutting process were entirely controlled. Thus, a database containing 99 datasets was provided and it has been used for analyses. The obtained results from the pruned and unpruned tree models showed a significant relationship between cutting rate and its factors. In the end, the results of M5P tree method were compared with statistical analyses (i.e., linear and nonlinear regression). The coefficient of determination be equal with 0.92, 0.86, 0.77 and 0.63 for unpruned tree, pruned tree, linear and nonlinear regression method respectively. This comparison showed that the both method of M5P tree technique have a better performance in predicting the cutting rate rather than the statistical regression methods.
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developing a new rock classification based on the abrasiveness hardness and toughness of rocks and pa for the prediction of hard dimension stone sawability in quarrying
Geosystem Engineering, 2017Co-Authors: Najmedin S Almasi, Reza Mikaeil, Reza Bagherpour, Yilmaz OzcelikAbstract:AbstractPredicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wire saw (DWS) as main performance criteria. For this purpose, a classification system for ranking the sawability of hard dimension stone based on the toughness, abrasiveness, and hardness of rock was initially developed, and a Hard Dimension Stone Sawability index (HDSSi) was defined. Then, by means of multiple curvilinear regression analysis, the data were analyzed and the relationship between the cutting rate with the HDSSi, and pullback amperage was obtained with a high correlation coefficient (.846) in data training, and .801 in data test. Validation of the model was carried out by considering the t-test, F-test, and the coefficient of determination. During this research, varieties of 11 types of hard rock were cut in a laboratory using a DWS and a fully instrumented cutting platform at different pull...
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developing a new rock classification based on the abrasiveness hardness and toughness of rocks and pa for the prediction of hard dimension stone sawability in quarrying
Geosystem Engineering, 2017Co-Authors: Najmedin S Almasi, Reza Mikaeil, Reza Bagherpour, Yilmaz OzcelikAbstract:Predicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wi...
Carvalho Helder - One of the best experts on this subject based on the ideXlab platform.
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Comparative Study of Needle Penetration Forces in Sewing Hems on Toweling Terry Fabrics: Influence of Needle Type and Size
'Walter de Gruyter GmbH', 2020Co-Authors: Carvalho Manuel, Rocha Ana Maria, Carvalho HelderAbstract:In this paper, an industrial case study comparing the use of different needles in the production of hems in towels is presented. The study aims to assess the Sewability of the fabrics, quantified by needle penetration forces. The market offers an interesting range of options for the needle, regarding the geometry of the needle point, surface finishing, and sizes. However, in practice, the choice is difficult, namely due to the lack of quantitative data that may support the empirical evaluation made by the sewing technicians. The work aims to assess how the needle type and size relate to the resulting needle penetration forces. Three terry fabric structures, produced by a home textiles manufacturer, were tested using needles of different sizes, points, and coatings. Needle penetration forces were measured on a Sewability tester prototype, previously designed and developed, based on an instrumented overedge sewing machine. It was found that needle penetration forces present very significant differences with small size increments, needle coating also influences forces significantly, and different needle points produce only slight differences, significant only on some of the fabrics that were tested
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Comparative study of needle penetration forces in sewing hems on toweling terry fabrics: influence of needle type and size
'Walter de Gruyter GmbH', 2020Co-Authors: Carvalho Manuel, Rocha A. M., Carvalho HelderAbstract:In this paper, an industrial case study comparing the use of different needles in the production of hems in towels is presented. The study aims to assess the Sewability of the fabrics, quantified by needle penetration forces. The market offers an interesting range of options for the needle, regarding the geometry of the needle point, surface finishing, and sizes. However, in practice, the choice is difficult, namely due to the lack of quantitative data that may support the empirical evaluation made by the sewing technicians. The work aims to assess how the needle type and size relate to the resulting needle penetration forces. Three terry fabric structures, produced by a home textiles manufacturer, were tested using needles of different sizes, points, and coatings. Needle penetration forces were measured on a Sewability tester prototype, previously designed and developed, based on an instrumented overedge sewing machine. It was found that needle penetration forces present very significant differences with small size increments, needle coating also influences forces significantly, and different needle points produce only slight differences, significant only on some of the fabrics that were tested.This work is financed by FEDER funds through the Competitivity Factors Operational Programme—COMPETE and by national funds through FCT—Foundation for Science and Technology within the scope of the project POCI-01-0145-FEDER-00713
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Sewing-room problems and solutions
'Elsevier BV', 2015Co-Authors: Carvalho Helder, Silva, Luís F., Carvalho Miguel, Ferreira FernandoAbstract:This chapter summarizes some of the most common sewing defects occurring in industrial sewing and analyses their causes and solutions. These defects are often minor faults mainly related to the aesthetical aspect of the seams, but in some cases they may result in the failure of the seams. Finally, research on techniques and technology for Sewability testing and automatic detection and prevention of these problems is presented and analysed.Este trabalho é financiado por fundos FEDER através do Programa Operacional Factores de Competitividade – COMPETE e por Fundos Nacionais através da FCT – Fundação para a Ciência e a Tecnologia no âmbito do projeto POCI-01-0145-FEDER-00713