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Probrano po
3.632 (61-70)
NaslovManagement of business risk hedging in construction contracts from the perspective of public investors / Barbara Andrlova, Jana Korytarova.
Materijalni opisGraf. prikazi.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisRisk management of construction projects presented in the article focuses on the management of business risk from the perspective of public investors in public works contracts in the Czech Republic. Based on the data analysis and a comparative study of specific attributes in contracts for works, the result of the research has been a portfolio of specific instruments and their recommended parameters for effective business risk management. Qualitative analysis was conducted using a questionnaire survey and structured interviews with public sector representatives to share their views on the current practice of protecting public procurement with regard to mitigate business risk. Types, functions and recommended parameters of hedging instruments has been proposed. Effective forms of hedging are mainly liability insurance for damage to things, property and health, contractual penalties, retention money and bank guarantees. Results of the research were compared with foreign practice and international contractual standards.
rrep
61
NaslovCAD based electric transporter path planning and production storage optimization using genetic algorithm - industrial case study / Miha Kovačič, Goran Đukić, Brigita Gajšek, Klemen Stopar.
Materijalni opisIlustr., graf. prikazi.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
NapomenaMOTSP 2020 - International Conference Management of Technology - Step to Sustainable Production, 30th September - 2nd October 2020, Bol, island Brač (Croatia).
OpisŠtore Steel Ltd. is one of the largest flat spring steel producers in Europe. There are two production lines after rolling – one for flat bars and the other for round bars. The flat bars production generally consists of visual examination, straightening and cutting operation. In addition, heat treatment or magnetic particle testing could be conducted. On the other hand, the round bars production consists generally of straightening, automatic control line control, chamfering and cutting. In addition, heat treatment is possible. For manipulation of the material in the rolling plant, the electric transporter and several cassettes are used. In the paper path planning and production storage optimization (i.e. storage spaces for cassettes) were conducted using genetic algorithm. The production storage is actually the space between main transport passage and individual operations. In the research the universal system using CAD geometry is presented where AutoCAD environment and in-house developed AutoLISP system were used. The production storage – storage spaces for cassettes (location and orientation) with corresponding electric transporter trajectories are represented as CAD objects and thus form individual solution/organism. The organisms undergo simulated evolution. The results of the evolution are compared with actual production storage in the steel plant.
rrep
62
NaslovIn-situ process monitoring in additive manufacturing using statistics and pre-process data / Eva Maria Scheideler, Andrea Huxol.
Materijalni opisIlustr.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisLong computation times are a major obstacle for the application of in-situ monitoring in additive manufacturing. This paper presents rapid in-situ monitoring, which returns a control value within typical build times. Observing powder bed fusion processes reveals that unsuitable parameter settings influence the appearance of the molten surface and the surrounding powder bed. The presented research approach evaluates the changing appearance of the exposed layers, in combination with the information from the preprocess about the position and geometry of the components in each layer. Grayscale images are captured with the build envelope camera and examined regarding the grayscale distribution in the critical areas surrounding the component boundaries. The grayscale distribution is then used to predict product quality by using standard statistical methods. The combination of the pre-process data and the fast analysis of the grayscale distribution allows promptly calculating a performance indicator for required process intervention and control.
rrep
63
NaslovDimensional structural mass optimization of a welded I-profile bridge crane girder / Nedim Pervan, Adis J. Muminovic, Elmedin Mesic, Mirsad Colic, Vahidin Hadziabdic.
Materijalni opisIlustr.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisThis paper presents the methodology for the development of an optimization model for the optimization of the cross-section dimensions of a bridge crane girder designed as a welded I-profile. To carry out this optimization, the CAD/CAE software package CATIA V5 was used. In order to develop an optimization model, a CAD geometrical model and structural analysis model were developed. Optimization was carried out by the iterative method using a simulated hardening algorithm. Additionally, the optimization process is carried out by using the PEO (Product Engineering Optimization) CATIA module that contains tools for setting the optimization criteria, design parameters, constraints, and algorithms. The goal of the optimization is to achieve the minimal mass of the girder, while satisfying all functional and geometrical constraints. As a result of the optimization process, minimal girder dimensions were obtained and due to that, a minimal amount of material can be used for the manufacturing of the girder.
rrep
64
NaslovThe information - communication process in a business with outsourcing for the maintenance of a complex technical system / Drago Kraljević, Krešimir Lacković, Robert Šojo.
Materijalni opisGraf. prikazi.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisThis paper discusses the process of communication between service providers and recipients when monitoring and maintaining complex technical systems. This requires sophisticated equipment, trained personnel and special methods and procedures. This is especially true for technical diagnostics, as the most complex form of monitoring and preventive maintenance. The relevant elements of maintenance by state and the experience of engaging an external partner are highlighted, especially when the complete monitoring for process control is performed virtually. In that sense, an information and communication process is proposed to ensure the efficiency of the complete system. The education of the external partner and the connection with the holders of external memories, research institutions and centres of excellence can be emphasized.
rrep
65
NaslovEnergy efficiency of a wooden house / Anca Constantin.
Materijalni opisIlustr.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisAn exemplary construction project developed in a commune close to Constanta, Romania, aims to build wooden houses for families with low income. The study focuses on their energy performance, aiming to determine simple technical solutions for the improvement of energy efficiency. The original house is a duplex ground floor building. The energy assessment was performed in accordance with the Romanian methodology for the original house, for the reference one and for a variant of the original house whose ground floor is insulated. The study showed that appropriate insulation of the ground floor which covers 30% of the thermal envelope area results in a heating energy saving of 17%. Furthermore, the original horizontal duplex was compared to its similar vertical version (ground floor and one storey) which is more compact, at the same heated volume and the same heated area. The reference vertical version saves 3% of heating energy.
rrep
66
NaslovAnalysis of methods for determining climate loads at a specified territory point by meteorological data / Željko Kos, Viktor Pashynskyi, Yevhenii Klymenko, Mykola Pashynskyi.
Materijalni opisGraf. prikazi.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisMethods for determining the characteristic values of climate loads at the location of a building have been perfected. Based on comparative analysis, the method of levelling the values of climate loads with an exponential or triangular weight function is recommended. For four climate loads, appropriate equalization intervals are determined, ensuring the maximum amount of weather data taken into account, while maintaining their uniformity. In construction, the determination of the climate load is important for the location of the building. When prescribing building standards, the values of the climate load are determined according to the data of weather stations in relative proximity, which provides values within the limits of reliability. Such an approach can lead to an overestimation of the characteristic values of climate loads and consequently increase the consumption of the construction materials of the building or, in the opposite case, decrease the unnecessarily high-energy consumption to condition the space inside the building.
rrep
67
NaslovIndustry 4.0 readiness assessment : comparison of tools and introduction of new tool for SME / Bernhard Axmann, Harmoko Harmoko.
Materijalni opisGraf. prikazi.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisThis research aims to establish an assessment tool for assessing the readiness of small and medium enterprises (SME) in industry 4.0. The assessment of the current and future status is crucial for companies to decide on the right strategy and actions on the road to a digital company. First will be compared existing tools such as: IMPULS (VDMA), PwC and Uni-Warwick. On that basis, a tool for SME will be introduce. The tool has 12 categories: data sharing, data storage, data quality, data processing, product design and development, smart material planning, smart production, smart maintenance, smart logistic, IT security, machines readiness and communication between machines. Those categories are grouped into three: data, software and hardware. Each category has five levels of readiness (from 1 to 5), with particular criteria that refer to literature studies and expert’s opinion.
rrep
68
NaslovAdditive manufacturing of polymer moulds for small-batch injection moulding / Damir Godec, Tomislav Breški, Miodrag Katalenić.
Materijalni opisIlustr.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisIn case of small-batch production, applications of classic technologies and tools, for e.g. injection moulding and classic moulds are not competitive. Application of additive technologies (AT) for direct production of finally parts can partially reduce deficiencies of classic approach, but there are for e.g. limited number of available materials. Potential solution is application of AT in production of so called bridge moulds for small-batch production from originally requested material for final part. This paper presents PolyJet process of AT and its possible application for production of bridge polymer moulds for injection moulding of small quantity of the moulded parts together with design rules for PolyJet bridge moulds.
rrep
69
NaslovTransformation towards sustainable business models in production : a case study of a 3D printer manufacturer / Shahban Ali Shah, Philipp Url, Wolfgang Vorraber, Thomas Janics, Matthias Katschnig.
Materijalni opisIlustr.
Način izrade datotekeizvorno digitalna građa
Vrstačlanak
OpisA global transformation from Industry 4.0 towards Industry 5.0 will soon take place. Such transformations are intrinsic to human and sustainable value creation. An increasing number of companies, recognising this imminent trend, will need to transform their current classical, solely profit-oriented business models into sustainable business models that also target human, social, and environmental aspects. Various frameworks already exist that support the design of sustainable business models. Practical applications of these frameworks and research on the transformation process in the production domain, which places a special focus on small and medium enterprises, is still scarce. This paper presents the first results from a sustainable business model transformation project on a European SME, which produces 3D printers. The research method applies a single case study design. The study was based on publicly available information and qualitative data, obtained through interviews and workshops carried out on an executive management level.
rrep
70
3.632 (61-70)