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Cost estimation, optimization and competitiveness of different composite floor systems
Uroš Klanšek, Stojan Kravanja, 2006, izvirni znanstveni članek

Opis: This paper presents self-manufacturing cost estimation, cost optimization and competitiveness of different composite floor systems: composite I beams, composite trusses produced from rolled channel sections and composite trusses made from cold formed hollow sections. Part 1 of this two-part series of papers presents the estimation of the self-manufacturing (direct production) costs for composite and steel structures. The self-manufacturing costs are proposed to be defined as the sum of the material, the power consumption and the labour costs. The material costs of the structural steel, concrete, reinforcement, the shear connectors, electrodes, the anti-corrosion, fire protection and top coat painting, the formwork floor-slab panels and gas consumption are presented in detail. The power consumption costs comprise costs of sawing the steel sections, edge grinding, drilling, welding, stud welding and vibrating the concrete. The labour costs (times) presented define the costs of metal cutting, edge grinding, preparation, assembling and tacking, welding, welding of shear connectors, steel surface preparation and protection, drilling, cutting, placing and connecting the reinforcement, concreting, consolidating and curing the concrete. New approximation functions are proposed for the calculation of some manufacturing times and material consumptions. As the discussed costs vary significantly around the world, the proposed cost expressions are given in the open form to be used for cost estimation in different economic conditions. A numerical example of the estimation of the self-manufacturing costs for a composite I beam floor system shows the suitability of the proposed approach. On the basis of the defined self-manufacturing costs, introduced in Part 1, the cost optimization and the competitiveness of different composite floor systems are discussed in Part 2.
Ključne besede: cost estimation, self-manufacturing costs, material costs, power consumption costs, labour costs, steel structures, composite structures, welded structures
Objavljeno: 30.05.2012; Ogledov: 923; Prenosov: 7
URL Polno besedilo (0,00 KB)

The influence of thread twist on alterations in fibers` mechanucl properties
Andreja Rudolf, Jelka Geršak, 2006, izvirni znanstveni članek

Opis: In order to design high-quality threads, it is necessary to know the properties of threads and fibers, as well as the loadings and deformations which may occur during the sewing process. Thread properties depend on the mechanical properties of the fiber and the constructional parameters of the thread and its surface treatment, which directly influence sewing performance.The mechanical properties of a thread primarily depend on the fiber mechanical properties and the amount of twist. Knowledge of the thread dynamic loadings during the sewing process, depending on the number of turns and the lubrication method, is important for planning the required processing properties of the thread. This paper presents research into the influence of thread twist and the lubrication method on the mechanical properties and dynamic load of PES core-spun thread and its fibers. Research into the mechanical properties of the different twisted and surface treated threads, and separated fibers was carried out for this purpose. The influence of threaddynamic load during a sewing process was also researched regarding any alterations in the mechanical properties of the threads and separated fibers. Analyses of the results show that the amount of twist depends on the mechanical properties of the thread and its constituent fibers, whilst the method of surface treatment is based on the specific mechanical properties of the thread. A dynamic load causes greater or smaller thread deformations, which is reflected in changes in the thread and fiber mechanical properties. The occurred changes depend on dynamic load, amount of twist, and the lubrication method, which is confirmed with statistical analysis of the measured results.
Ključne besede: garment manufacturing, sewing, threads, textile fibres, surface treatment, dynamic loads, mechanical properties, amount of twist
Objavljeno: 30.05.2012; Ogledov: 1188; Prenosov: 4
URL Polno besedilo (0,00 KB)

Design of row-based flexible manufacturing system with evolutionary computation
Mirko Ficko, Jože Balič, 2008, objavljeni znanstveni prispevek na konferenci

Opis: This paper discusses design of flexible manufacturing systems (FMSs) in one or multiple rows. Evolutionary computation, particularly genetic algorithms (GAs) proved to be successful in search of optimal solution for this type of problems. The model of solution, the most suitable way of coding the solutions into the organisms and the selected evolutionary and genetic operators are presented. In this connection, the most favourable number of rows and the sequence of devices in the individual row are established by means of genetic algorithms (GAs). In the end the test results of the application made and the analysis are discussed.
Ključne besede: flexible manufacturing system design, genetic algorithms, evolutionary computation, intelligent manufacturing systems, artificial intelligence
Objavljeno: 31.05.2012; Ogledov: 771; Prenosov: 9
URL Polno besedilo (0,00 KB)

Cost Oriented Robots for Kosovo
A. Pajaziti, Sh. Buza, I. Gojani, Riko Šafarič, Peter Kopacek, 2009, izvirni znanstveni članek

Opis: The cost of developing and operating control and automation systems is a crucial factor of productivity and competitiveness for a number of applications in manufacturing plants, quality control systems and robotics. This paper has been focused on practical use of technologies that provided significant cost reduction in operating automated systems for a variety of industrial applications and buildings/facilities operations in Kosovo. Topics that have been discussed were as following: key technologies reducing cost of automation systems; industrial applications of variety technologies, such as smart devices, wireless sensors and control systems, field robots, etc.; cost reducing engineering strategies as well as simulation of manufacturing systems and processes form cost estimation.
Ključne besede: robots at SMEs, manufacturing automation, cost oriented automation
Objavljeno: 31.05.2012; Ogledov: 796; Prenosov: 2
URL Polno besedilo (0,00 KB)

Employing visualisation techniques and tools for educational purposes in textile studies
Zoran Stjepanović, Darinka Fakin, 2010, izvirni znanstveni članek

Opis: Modern textile and clothing manufacturers can today use the entire range of conventional CAD/CAM systems together with new computer graphics and Internet-based technologies in order to strengthen their position on the market, building a completely new electronic-business offer. Graphical presentation of textile products and processing, or visualisation, presents a promising technology that can be treated as a potential enrichment of conventional computer aided technologies used today by the majority of advanced producers of textile fabrics, clothing, and other textile products. The article presents the results of research on designing computer software for visualising the fabric dyeing process. The program package produced enables the effective visualisation of two fabric dyeing processes: a Pad-Batch machine line for dyeing flat textiles in open-width state, and an HT overflow dyeing machine for fabric dyeing in rope form. Graphical applications of both dyeing processes can be used for both industrial and educational purposes. In this article, we focus more on presenting the program structure and functionalities for using the software to support the education of textile students.
Ključne besede: visualisation, clothing manufacturing, CAD/CAM sistems, computer graphics
Objavljeno: 31.05.2012; Ogledov: 925; Prenosov: 4
URL Polno besedilo (0,00 KB)

Intelligent process planning for competitive engineering
Valentina Gečevska, Franc Čuš, 2010, izvirni znanstveni članek

Opis: Process planning is one of the key activities for product design and manufacturing. The impact of process plans on all phases of product design and manufacture requires high level of interaction of different activities and close integration of them into a coherent system. This paper presents a process model of product development with manufacturing approach based on intelligent process planning techniques with focus on optimal selection of manufacturing parameters. Some derivations of the computing model for analysis of machining conditions by optimal determination of the cutting parameters in multi-pass NC machining activities are made with implementation of new evolutionary computation techniques. Genetic Algorithm (GA) based optimization method and deterministic optimization method (DO) are developed and then implementations into real manufacturing process planning for new product developed are analyzed. The results showed that both the developed optimization methods (GA and DO), especially GA, are effective methods for solving multi-objective optimization problems during the manufacturing process planning and cutting parameters selection.
Ključne besede: genetic algorithm, intelligent manufacturing systems, process planning
Objavljeno: 31.05.2012; Ogledov: 746; Prenosov: 1
URL Polno besedilo (0,00 KB)

Additive fabrication in metallurgy - case study of grey cast iron valve production
Bogdan Valentan, Igor Drstvenšek, Tomaž Brajlih, Peter Sever, Simon Brezovnik, Jože Balič, 2010, strokovni članek

Opis: Additive Fabrication technologies are well known from the last two decades. In that time Additive Fabrication technologies have evolved from strictly prototype part production into an option that can also be used to produce end-user parts. With development of Additive Fabrication machines capable of producing metal parts, a complete substitution of conventional metal casting technologies is possible. However, direct Additive Fabrication of metal parts is still not time/cost effective when producing large volume parts, and nowadays there is still lack of materials that can be used on those machines. This paper presents a method how a conventional sand casting process can be assisted by Additive Fabrication technologies. A sand mould pattern is produced by Selective Laser Sintering. Additive Fabrication is also used in direct manufacturing of cores.
Ključne besede: gray cast iron, layered technologies, rapid prototyping, rapid manufacturing, sand casting
Objavljeno: 31.05.2012; Ogledov: 897; Prenosov: 2
URL Polno besedilo (0,00 KB)

Intelligent interface in a flexible production environment
Igor Drstvenšek, Ivo Pahole, Miha Kovačič, Jože Balič, 2005, izvirni znanstveni članek

Opis: The paper describes a universal postprocessor initially intended to translate NC code for non-standard NC controllers. By adding arithmetic modules and connecting it to the technological database (TDB) it's functionality is broaden to a wider range of production planning problems, such as quick calculations of costs, evaluation of production possibilities and disposability of tools, etc. Thus, an automation tool is gained that enables its user to participate in a virtual manufacturing market and quickly and effectively evaluate jobs offered.
Ključne besede: production technology, virutal manufacturing, postprocessing, NC interface, CAM
Objavljeno: 01.06.2012; Ogledov: 597; Prenosov: 1
URL Polno besedilo (0,00 KB)

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