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Starting from the general principles of material cutting, with applicability to coal and overburden excavation using bucket wheel excavators (BWEs), this paper proposes another method for calculating the drive power of the bucket wheel excavator by computer modeling. This approach required two steps. In the first step, the volume of the excavated material for one slewing movement of the boom and for a particular excavation geometry was determined, and the slewing time in the open pit coal mine was measured. In the second one, the values of the specific energy (SE) consumption for cutting were determined by laboratory tests on samples of material taken from the open pit mine. The proposed method allows for the estimation of the load of the bucket wheel drive motor by taking into account only the specific energy necessary for the cutting of the material, the excavated volume during one slewing, and the time required to excavate this volume, and not the wear coefficients of the teeth or bucket edge. This method is important for establishing the correlation between the height of the excavated slice and the slewing speed of the boom in order to optimize the drive power of the bucket wheel and thus improve energy efficiency, increase the performance of excavators, and reduce operating costs.
Ildiko Brînaș; Andrei Andraș; Sorin Radu; Florin Popescu; Iosif Andraș; Bogdan Marc; Alexandru Cioclu. Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry. Energies 2021, 14, 3892 .
AMA StyleIldiko Brînaș, Andrei Andraș, Sorin Radu, Florin Popescu, Iosif Andraș, Bogdan Marc, Alexandru Cioclu. Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry. Energies. 2021; 14 (13):3892.
Chicago/Turabian StyleIldiko Brînaș; Andrei Andraș; Sorin Radu; Florin Popescu; Iosif Andraș; Bogdan Marc; Alexandru Cioclu. 2021. "Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry." Energies 14, no. 13: 3892.
The sustainable exploitation of raw materials, with improved safety and increased productivity, is closely linked to the development of mechanical mining installations. Mine hoists are designed for the transport of material, equipment and personnel between the mine surface and the underground. The mine hoist braking system is of paramount importance in its safe operation. Thus, for both drum and disc brake systems, the temperature of the friction surfaces is important for ensuring efficient braking, as exceeding the temperature threshold causes a decrease in the braking capacity. In this paper we present a numerical calculation model for the temperature of the braking disc of a mine hoist in the case of emergency braking. A real-scale model was built, based on the cable drive wheel and disc brake system of a hoisting machine used in Romania. Real material characteristics were imposed for the brake discs, the cable drive wheel and the brake pads. The simulation was performed for decelerations of 3, 3.5, 4 and 4.5 m/s2. The analysis shows that regardless of the acceleration and time simulated, the disc temperature reaches its maximum after 1.35 s of emergency braking. This value does not exceed the 327 °C limit where, according to previous studies, the braking power starts to fade. It means that the emergency braking is safe for the acceleration and masses under consideration, in the case of the studied mine hoist.
Florin Popescu; Sorin Radu; Andrei Andraș; Ildiko Brînaș. Numerical Modeling of Mine Hoist Disc Brake Temperature for Safer Operation. Sustainability 2021, 13, 2874 .
AMA StyleFlorin Popescu, Sorin Radu, Andrei Andraș, Ildiko Brînaș. Numerical Modeling of Mine Hoist Disc Brake Temperature for Safer Operation. Sustainability. 2021; 13 (5):2874.
Chicago/Turabian StyleFlorin Popescu; Sorin Radu; Andrei Andraș; Ildiko Brînaș. 2021. "Numerical Modeling of Mine Hoist Disc Brake Temperature for Safer Operation." Sustainability 13, no. 5: 2874.
The bucket wheel excavator (BWE) is a complex continuous digging machine, used to excavate material using a layout of buckets installed on a rotor (bucket wheel), and at the same time, using the conveyor system installed on its boom, transferring this material to the main conveyor. The bucket wheel is the operating equipment, and it rotates in the vertical plane and performs (with the boom) a pivoting movement in the horizontal plane and an ascendant – descendent movement in the vertical plane. The paper presents a new grafo-numeric method of determination of the operation power of the BWE rotor, using computer simulation in SolidWorks. The aim of using virtual models for the analysis of the operation of some components of the BWE is to reduce the specific energy consumption during cutting while maintaining the installed operation power of the rotor, to increase the excavation capacity and to improve the cutting – loading system.
Florin Dumitru Popescu; Sorin Mihai Radu; Andrei Andraş; Ildiko Kertész (Brînaş). A grafo-numeric method of determination of the operation power of the rotor of EsRc-1400 bucket wheel excavator using computer simulation in SolidWorks. MATEC Web of Conferences 2019, 290, 04007 .
AMA StyleFlorin Dumitru Popescu, Sorin Mihai Radu, Andrei Andraş, Ildiko Kertész (Brînaş). A grafo-numeric method of determination of the operation power of the rotor of EsRc-1400 bucket wheel excavator using computer simulation in SolidWorks. MATEC Web of Conferences. 2019; 290 ():04007.
Chicago/Turabian StyleFlorin Dumitru Popescu; Sorin Mihai Radu; Andrei Andraş; Ildiko Kertész (Brînaş). 2019. "A grafo-numeric method of determination of the operation power of the rotor of EsRc-1400 bucket wheel excavator using computer simulation in SolidWorks." MATEC Web of Conferences 290, no. : 04007.
The sustainability of lignite production requires, among other factors, cost reduction, high efficiency, as well as the increase of the production capacity. In order to rationalize and increase the efficiency of lignite mines, the optimization of the production process is necessary. In this respect, equipment revitalization and modernization is a key issue. This paper deals with the analysis of the time response of the boom structure of a bucket wheel excavator (BWE) during operation. For this, we propose a virtual model of the boom, on which a variable-in-time force generated by the bucket wheel acts. The kinematic drive chain of the bucket wheel and the conveyor belt, which are also vibration generators, were simulated only by the static load produced on the excavator’s boom. Thus, it is possible to highlight the time response of the load-bearing structure (the boom) of the bucket wheel to the action of forces resulting from the cutting of the face under pretensioning conditions. The forces generated by the excavation process have high values and a slow variation over time, depending on the bucket wheel’s rotation speed and the number of buckets installed on the wheel. The dynamic time response simulation was performed considering the global damping variation as dependent on frequency. The simulation was done for both the excavation of a homogeneous material and for the case of the sudden appearance of a hard material inclusion (boulder) during homogenous material cutting.
Florin Dumitru Popescu; Sorin Mihai Radu; Krzysztof Kotwica; Andrei Andraș; Ildiko Kertesz (Brînaș). Simulation of the Time Response of the ERc 1400-30/7 Bucket Wheel Excavator’s Boom during the Excavation Process. Sustainability 2019, 11, 4357 .
AMA StyleFlorin Dumitru Popescu, Sorin Mihai Radu, Krzysztof Kotwica, Andrei Andraș, Ildiko Kertesz (Brînaș). Simulation of the Time Response of the ERc 1400-30/7 Bucket Wheel Excavator’s Boom during the Excavation Process. Sustainability. 2019; 11 (16):4357.
Chicago/Turabian StyleFlorin Dumitru Popescu; Sorin Mihai Radu; Krzysztof Kotwica; Andrei Andraș; Ildiko Kertesz (Brînaș). 2019. "Simulation of the Time Response of the ERc 1400-30/7 Bucket Wheel Excavator’s Boom during the Excavation Process." Sustainability 11, no. 16: 4357.
Ildikó Kertész; Sorin-Mihai Radu; Florin-Dumitru Popescu; Iosif Andras; Andrei Andras. A numerical method for the calculus of the operation power of the rotor of a bucket wheel excavator. The publications of the MultiScience - XXXII. MicroCAD International Scientific Conference 2018, 1 .
AMA StyleIldikó Kertész, Sorin-Mihai Radu, Florin-Dumitru Popescu, Iosif Andras, Andrei Andras. A numerical method for the calculus of the operation power of the rotor of a bucket wheel excavator. The publications of the MultiScience - XXXII. MicroCAD International Scientific Conference. 2018; ():1.
Chicago/Turabian StyleIldikó Kertész; Sorin-Mihai Radu; Florin-Dumitru Popescu; Iosif Andras; Andrei Andras. 2018. "A numerical method for the calculus of the operation power of the rotor of a bucket wheel excavator." The publications of the MultiScience - XXXII. MicroCAD International Scientific Conference , no. : 1.
Florin-Dumitru Popescu; József Kovács; Sorin Mihai Radu; Andrei Andraș; Ildikó Kertész. A method of continuous tilt control of the bucket wheel excavators using inclinometers. The publications of the MultiScience - XXXII. MicroCAD International Scientific Conference 2018, 1 .
AMA StyleFlorin-Dumitru Popescu, József Kovács, Sorin Mihai Radu, Andrei Andraș, Ildikó Kertész. A method of continuous tilt control of the bucket wheel excavators using inclinometers. The publications of the MultiScience - XXXII. MicroCAD International Scientific Conference. 2018; ():1.
Chicago/Turabian StyleFlorin-Dumitru Popescu; József Kovács; Sorin Mihai Radu; Andrei Andraș; Ildikó Kertész. 2018. "A method of continuous tilt control of the bucket wheel excavators using inclinometers." The publications of the MultiScience - XXXII. MicroCAD International Scientific Conference , no. : 1.
Florin Dumitru Popescu; Sorin Mihai Radu; Andrei Andraş Andraş. Study of functional performance improvements for cutting teeth mounted on bucket wheel excavators operating in Oltenia coal basin – Romania. Mining - Informatics, Automation and Electrical Engineering 2018, 3 (535), 1 .
AMA StyleFlorin Dumitru Popescu, Sorin Mihai Radu, Andrei Andraş Andraş. Study of functional performance improvements for cutting teeth mounted on bucket wheel excavators operating in Oltenia coal basin – Romania. Mining - Informatics, Automation and Electrical Engineering. 2018; 3 (535) (1):1.
Chicago/Turabian StyleFlorin Dumitru Popescu; Sorin Mihai Radu; Andrei Andraş Andraş. 2018. "Study of functional performance improvements for cutting teeth mounted on bucket wheel excavators operating in Oltenia coal basin – Romania." Mining - Informatics, Automation and Electrical Engineering 3 (535), no. 1: 1.
Florin Popescu. NEW TRENDS TO OPTIMIZE THE OPERATING PARAMETERS OF VERTICAL TRANSPORT INSTALLATIONS. 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies 2017, 1 .
AMA StyleFlorin Popescu. NEW TRENDS TO OPTIMIZE THE OPERATING PARAMETERS OF VERTICAL TRANSPORT INSTALLATIONS. 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies. 2017; ():1.
Chicago/Turabian StyleFlorin Popescu. 2017. "NEW TRENDS TO OPTIMIZE THE OPERATING PARAMETERS OF VERTICAL TRANSPORT INSTALLATIONS." 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies , no. : 1.
Florin Popescu. THE METHOD OF MINIMIZING THE CALCULATED POWER OF VERTICAL TRANSPORT INSTALLATIONS. 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies 2017, 1 .
AMA StyleFlorin Popescu. THE METHOD OF MINIMIZING THE CALCULATED POWER OF VERTICAL TRANSPORT INSTALLATIONS. 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies. 2017; ():1.
Chicago/Turabian StyleFlorin Popescu. 2017. "THE METHOD OF MINIMIZING THE CALCULATED POWER OF VERTICAL TRANSPORT INSTALLATIONS." 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies , no. : 1.
Florin Dumitru Popescu; Sorin M. Radu; Ildiko Branas Kertesz; Marioara Benea Vesa. New Methods for Process Reliability Analysis. The publications of the MultiScience - XXXI. MicroCAD International Scientific Conference 2017, 1 .
AMA StyleFlorin Dumitru Popescu, Sorin M. Radu, Ildiko Branas Kertesz, Marioara Benea Vesa. New Methods for Process Reliability Analysis. The publications of the MultiScience - XXXI. MicroCAD International Scientific Conference. 2017; ():1.
Chicago/Turabian StyleFlorin Dumitru Popescu; Sorin M. Radu; Ildiko Branas Kertesz; Marioara Benea Vesa. 2017. "New Methods for Process Reliability Analysis." The publications of the MultiScience - XXXI. MicroCAD International Scientific Conference , no. : 1.