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    Wyświetlanie 1-5 z 5
    Tytuł:
    Computational investigation of vibration characteristics analysis for industrial rotor
    Autorzy:
    Aimeur, Noureddine
    Menasri, Noureddine
    Powiązania:
    https://bibliotekanauki.pl/articles/2204679.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    rotor dynamic
    finite element method
    reverse design
    CMM
    unbalanced
    blade wear
    simulation
    ANSYS
    Opis:
    During the operation of a rotor, various types of vibrations appear in this mechanical system and often limit the performance and endanger the safety of the operation. Therefore, dynamic analysis is essential because precise knowledge of the vibration behaviour is essential to ensure proper operation. This article presents a set of scientific techniques for the modelling and simulation of rotor vibrations. To work out the equations of the vibratory movement of the rotor, we used the energy approach of Lagrange. To achieve this, a model with one blading wheel carried by a shaft supported by two hydrodynamic bearings is chosen basedon the characteristics of the rotor studied (Fan 280 cement draft fan). It is an arduous task to manually ascertain the analytical resolution of the differential equations that characterise the vibratory behaviour of the rotor. The numerical approach employing the finite element method, programmed on the ANSYS software, made it possible to perform the vibration analysis of the rotor. First, the FAN 280 cement draft fan rotor is modelled using SolidWorks 3D software and reverse design using the coordinate measuring machine (CMM) for the design of the fins. Then, the modal characteristics of the fan rotor model were analysed using the finite element analysis (FEA) software ANSYS Workbench. Also, to study the effect of blade wear on critical speeds, the Campbell diagram was obtained. Finally, harmonic analysis was performed to determine the amplitude of the rotor vortex at critical speeds obtained with and without blade wear.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 4; 373--381
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation Between Key Parameters of Wood Biomass Reverse Supply Chains and Their Impact on Total Biomass Acquisition Levels
    Autorzy:
    Dubisz, Damian
    Kawa, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27323525.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    reverse chain determinants
    wood biomass
    reverse logistics
    supply chain parameters
    reverse supply chain design
    Opis:
    Effectiveness is the prism through which supply chains are defined. Different management methods can be used to measure supply chain effectiveness, such as life cycle assessment or sustainable supply chain management. In order to properly model and manage reverse supply chains for wood biomass, the structure of the supply chains was examined. For this purpose, a correlation analysis of the basic parameters of wood biomass reverse supply chains was carried out. After their identification, the level of mutual correlation was verified using Pearson's correlation coefficient. The coefficient of determination r2 was also verified for the two parameters with the highest degree of interaction – the sales of wood chips and the purchase of wood biomass. To improve the verification, scatter plots were made to further confirm the degree of interaction. As a result of the analysis of the parameter interdependencies and a discussion of the results of other international studies, the parameters were found to be applicable in modelling effective reverse supply chains of wood biomass.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 211; Art. no. 1644-3985.449.06
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Reverse Engineering and Additive Printing in the Reconstruction of Gears
    Autorzy:
    Palka, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/2064788.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    3D printing
    design
    gears
    reconstruction
    reverse engineering
    Opis:
    Despite the very rapid technological development, the general concept of mechanical devices has not changed. Still, the most common element of these devices are gears, whose range of use is very wide. There are both technological and historical considerations for the reconstruction of gears and other elements. In particular, this applies to spare parts for technical facilities that are not available on the market or service costs are too high. Contemporary reconstruction is called Reverse Engineering, which offers tools that allow transformation of an existing object through a virtual model into the final real product. Modern production engineering is based on innovative CAD – Computer Aided Designed design methods and computer-aided manufacturing technologies, CAM – Computer Aided Manufacturing. The rapid development of 3D CAD systems has led to the development of solutions to obtain the designed object, already at the development stage. Such a solution is the Rapid Prototyping method, designed for fast, precise and repeatable production of machine components. Widespread use and growing interest in the use of additive printing influenced the development of this technology. The purpose of the article is to present the practical application of the Reverse Engineering method and 3D printing in the reconstruction of gears. The object of research is the real gear, which has been reconstructed using Reverse Engineering and 3D printing. The article presents the basic assumptions of the methods used and the methodology for conducting reconstruction work. FDM (Fused Deposition Modeling) technology was used for the research. The results obtained are a real example of the practical application of the presented methods. At the same time, they create great opportunities for their wider use.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 274--284
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of uniform test design in optimizing the flotation reagents of iron anionic reverse flotation circuit
    Autorzy:
    Hou, Ying
    Sobhy, Ahmed
    Powiązania:
    https://bibliotekanauki.pl/articles/2146945.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    iron oxide
    quartz
    uniform test design
    reverse flotation
    optimization
    flotation reagents
    Opis:
    Most iron reserves are low in grade with quartz as the main gangue mineral, and anionic reverse flotation has become the most crucial separation method in the processing plants of iron ore. Thus, a flotation feed sample that is a mixture of low-intensity and high-gradient magnetic separators concentrates was acquired from a processing plant. The sample characterizations with X-ray diffraction (XRD), X-ray fluorescence (XRF), laser particle size analyzer, and mineral liberation analysis (MLA) confirmed that the sample consists of iron oxide as a valuable mineral and quartz as a gangue mineral with adequate liberation degree. In the anionic reverse flotation, the interaction of the flotation reagents with the constituents of the feed makes the flotation a complex system. Thus, the selection and optimization of regent dosages were performed using a uniform experimental design to estimate the optimum separation efficiency. The optimum reagent system was 1.6 kg/Mg starch depressant, 1.0 kg/Mg calcium oxide (lime) activator, and 0.8 kg/Mg TD-II anionic collector. At the optimum, 68.90% iron grade with 92.62% recovery was produced.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 37--49
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study on end-of-life vehicles network design
    Autorzy:
    Merkisz-Guranowska, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/949845.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    end-of-life vehicles
    ELV reverse logistics
    ELV recycling network
    ELV network design
    pojazdy wycofane z eksploatacji
    logistyka pojazdów ELV
    recykling pojazdów
    Opis:
    This paper investigates the current research in the field of the end-of-life vehicles (ELV) recycling network. The optimisation of the location of a network facilities in forward logistics in the automotive industry has received a lot of attention for many years but the reverse logistics for ELVs has been a subject of investigations since the beginning of 21st century. ELV recycling network design gained in popularity after the European Union and other countries like Japan, South Korea and recently China introduced legal obligations to organize a collecting or recycling network for used vehicles. When regulations are introduced, there is a need for a systemic solution to the problem, especially since the obligation to create a collection network is often accompanied by requirements related to its accessibility for vehicle owners or efficiency of operation. With the growing scope of legal regulations, companies or organisations responsible for the network are forced to redesign the existing recycling infrastructure in a given area so that it meets specific requirements. Initially, the most important criterion was network availability. Currently, the same importance is attached to economic, environmental and social aspects in order to meet the sustainability criteria. In this paper, forty one peer-reviewed published studies focused on network design were classified. Its main purpose is to provide an extensive review of state-of-the-art research published in the period 2000-2019. The scope of the review is limited to network design problems including facility location and flow allocation problems. Only papers that present mathematical models are considered. Studies on the ELV network design are classified based on: type of supply chain, type of network, optimisation problem, type of facilities, modelling technique, single/multi objectivity, objective function, period of time, solution approach and scope of implementation. The final part of the paper includes discussion of the methodology of the reviewed studies and some recommendations for future research area.
    Źródło:
    Archives of Transport; 2020, 54, 2; 107-123
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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