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Wyświetlanie 1-15 z 182
Tytuł:
A Novel Approach to the Screw Feeder Design to Improve the Reliability of Briquetting Process in the Roller Press
Autorzy:
Baiul, Kostiantyn
Vashchenko, Serhii
Khudyakov, Olexander
Bembenek, Michał
Zinchenko, Andrii
Krot, Pavlo V.
Solodka, Nataliia
Powiązania:
https://bibliotekanauki.pl/articles/27312771.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
fine-grained materials
briquetting
roller press
screw feeder
optimal design
compaction coefficient
Opis:
The screw feeder design for the pre-compaction of bulk materials to be briquetted in a roll press is considered to increase the overall reliability. The relationship between the parameters of the screw feeder and its technological characteristics is investigated by the example of two fine-grained materials. A new mathematical model and design algorithm have been developed, which takes into account the properties of materials, the roller press parameters, the shape of the briquettes, and their deformation after compaction. The relationship between the pre-compaction pressure and the material stack height at the inlet is determined. The relations between the torque, the screw pitch, and the material stack height above the inlet, as well as the drive power and the screw pitch on productivity, are investigated. In experiments, using the proposed design, the compaction ratio of the peat increases by 22-27%, and hydrolyzed lignin –by 14-17%. The proposed approach allows for preventing drive overloading and ensures the reliable operation of pre-compaction devices for the roller presses.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 167967
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different roller end-flange constructions on the fatigue life of the cylindrical roller bearings: A novel flange deformation formula
Autorzy:
Bayrak, Ramazan
Sagirli, Ahmet
Powiązania:
https://bibliotekanauki.pl/articles/28328272.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
cylindrical roller bearing
roller end-flange design
fatigue life
misalignment
Opis:
This paper performs the fatigue life analysis of the radial Cylindrical Roller Bearings (CRBs) with consideration of various roller end-flange shapes such as toroidal-toroidal, spherical-toroidal, and spherical-conical. A novel formula for each flange contact deformation in cylindrical roller bearing with different roller end-flange geometry including toroidal geometry is developed. Inner ring misalignment angle and radial deflection results obtained from the present study are verified with numerical and experimental results from the literature. The results approach to that of literature when the flange is changed from toroidal geometry to conical geometry. Using formulas developed in the present study, the effect of various roller end-flange geometries on the bearing life is investigated for different external loadings. It is observed that the bearing life increases when the roller end and flange are changed to toroidal geometry.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174296
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Window Roller Blinds on Energy Consumption in Residential Buildings in Serbia
Autorzy:
Djoković, Jelena M.
Nikolić, Ružica R.
Bokůvka, Otakar
Pastorková, Jana
Powiązania:
https://bibliotekanauki.pl/articles/27323565.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
exterior window blinds
heat load
cooling load
lighting
energy efficiency
rolety zewnętrzne
obciążenie cieplne
obciążenie chłodnicze
oświetlenie
efektywność energetyczna
Opis:
Roller blinds are devices that are retracted and wrapped in a box above the window opening and are used to protect against the solar radiation. Those are the well-known devices with distinct advantages over the fixed external dimming elements. The influence of external blinds on the internal thermal environment in climatic conditions in the Republic of Serbia, the city of Kragujevac, was considered in this research. An external blind was installed in the test room and its influence on the internal temperature was compared with the internal temperature of the room without the blind. Real-time monitoring was carried out in February and August 2023. The results presented in this paper show that the blind reduces the temperature in summer by 3.57ºC and increases it in winter by 1.76ºC. The cooling load can be reduced by about 20%, and the heat load by about 15%.
Źródło:
System Safety : Human - Technical Facility - Environment; 2023, 5, 1; 75-82
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Process of Separation of Fibers From Seeds During Roll Ginning
Autorzy:
Sailov, Rahib Aqaqul
Powiązania:
https://bibliotekanauki.pl/articles/24200949.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
knife drum
cottonseed
fibre strand
coefficient of elasticity
roller gin
Opis:
In the initial position in the process of roll ginning, the seed is drawn to the slot of the contact gap of the knife-drum due to the tension of the fibers. Subsequently, the seed is struck with a certain impulse. The separation of the fibers from the seed after the impact of the beater occurs sequentially, not simultaneously. As a result of theoretical and experimental studies, the optimum frequency of the shock pulse on the seed (f = 18-20) was found to be the most technologically successful in terms of providing the best quality indicators of seeds and fibers. Beating in the resonance mode allows to reduce the magnitude of the shock impulse on the seed, leading to a reduction in the degree of damage to the seeds. At this moment, the seeds at the end of the strand move only under the action of an elastic restoring force. The active part of the fiber bundle section in a dynamic process can be as little as 0.001 or less. The average value of the compliance coefficient for the raw cotton variety BA-440 was determined experimentally. This allowed to determine the stiffness coefficient of the volatiles indirectly. According to the parameters obtained, the dynamic state of the system practically falls into the region of parametric resonance, where the motion is unstable. This means that the damaged seeds at the end of the strand enlarge significantly after the impact of the beater, causing the seeds to separate from the fibers.
Źródło:
Fibres & Textiles in Eastern Europe; 2023, 31, 1; 91--94
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the vibratory roller compaction process of road soils
Autorzy:
Căpăînă, Dragoş
Niţu, Marilena Cristina
Iliescu, Mihaiela
Powiązania:
https://bibliotekanauki.pl/articles/27829905.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Opis:
Road infrastructure is aimed to be sustainable construction in today’s condition of heavy traffic. Depending on geotechnical characteristics of soils there are chosen adequate techniques for compaction, meaning: type of compaction, equipment, compaction parameters and, if possible, computer aided acquisition and processing of data. This paper presents research results on the vibratory roller compaction process of road soils, from the point of view of process mathematically modeling and statistically modeling of process parameters interdependence. The obtained regression model is innovative one and fit for further application in optimization (by AI and IoT) of the compaction process. Good correlation of all the results (self-pulsation values) proves the adequate assumptions for both modeling and experimenting. Further development of this research is intended to develop a special software for direct correlation of road geographical position and soil characteristics to the compaction process parameters optimum values.
Źródło:
Archives of Civil Engineering; 2023, 69, 4; 431--444
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance optimization of multi-roller flat burnishing process in terms of surface properties
Autorzy:
Le, Minh-Thai
Van, An-Le
Nguyen, Trung Thanh
Powiązania:
https://bibliotekanauki.pl/articles/24084649.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
roller burnishing
average roughness
Brinell hardness
process parameter
Opis:
In the current investigation, two primary indicators, including the average roughness (AR) and Brinell hardness (BH) of the roller burnishing operation are enhanced using the optimal inputs (the spindle speed-S, feed rate-f, and depth of penetration-D). The performance measures are developed using the Kriging approach and optimal outcomes are generated by the Crow Search Algorithm (CSA). The optimal outcomes generated by the CSA of the S, f, and D were 832 rpm, 112 mm/min, and 0.12 mm, while the AR was reduced by 37.0% and the BH was increased by 29.9%, respectively. The optimal findings could be utilized in the practice for enhancing the burnished quality and to develop a professional system related to the roller burnishing operation. The Kriging-based AR and BH correlations could be used to present nonlinear experimental data. The optimizing technique could be utilized to deal with optimizing problems for different machining operations.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 159--173
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prototype of 3D printed mecanum wheel
Autorzy:
Mateja, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2203616.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
mecanum wheel
omnidirectional wheel
roller
3d print
mobile platform
Opis:
This article presents the results of work related to design, analysis and selection of the 3D printed mecanum wheels. Initial CAD model does not include material type of the rollers. Rollers were printed in 4 types of filament: PLA, ABS, PETG, FLEX. Analysis, tests and target destination of use allowed to choose the best material for rollers which will meet the usage requirements. Next step after choose material for roller were assembly of the wheels. Wheels were tested on the simple platform. Assembled 4 wheels (two left and two right) allowed to carry out tests to verify the mobility of the mobile robot and check the adhesion between rollers and ground.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2023, 26(1); 33--43
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Analysis of Properties of Technological Charge and Manufacturing Tolerance of Thin-Walled Sections in Process of Multi-Workstations Roller Bending
Autorzy:
Tracz, P.
Wacławiak, Krzysztof
Chrapoński, Jacek
Popiel, R.
Powiązania:
https://bibliotekanauki.pl/articles/28099633.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
technological charge
cold-rolled forming
statistics
manufacture tolerance
Opis:
The studied collecting electrodes for electrostatic precipitators are cold-rolled formed. Here Sigma 750 open section was manufactured of DC01 steel grade. Length of the electrodes ranged from 8 to 13 meters, all were thin-walled of 1.5 mm. Tolerance of their manufacture is strictly set. A database of material properties, chemical composition, and a set of final tolerance of manufactured profiles has been collected. At first basic statistics for the data has been done. Finally statistical relation between the material composition and profile geometrical tolerance has been studied, next between the material mechanical properties and profile geometrical tolerance has been examined.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 733--740
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Burnishing Process of the Duplex Cast Steel in Aspect of Improving the Tribological Properties
Autorzy:
Stradomski, G. E.
Fik, Joanna
Rydz, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/27314153.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
tribology
duplex cast steel
static pressure roller burnishing
SPRB
trybologia
staliwo duplex
dogniatanie
Opis:
Duplex cast steel it is a material with great potential. The properties of this material have contributed to its wide application in many industrial sectors, for example: oil extraction, printing, petrochemical industry, energy - flue gas desulphurization systems, seawater desalination plants, shipbuilding industry. The article presents the results of tribological tests following the static pressure roller burnishing (SPRB) process of GX2CrNiMoN22-5-3 duplex cast steel. The tests provided a basis for assessing the effect of the burnishing parameters on tribological properties of that material. The issue is important because the authors focused their research on duplex cast steels grade that are not containing copper. The article presents part of the research concerning the influence of the burnishing process on the properties of the duplex steel surface layer. Copper in duplex steels affects many areas one of them is the plastic properties. Its absence also reduces castability. Because of that it is reasonable to determine to what extent the properties of the surface layer of copper-free duplex cast steel grades can be shaped in burnishing process.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 51--57
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An innovative method of measuring the extension of the piston rod in hydraulic cylinders, especially large ones used in the shipbuilding and offshore industry
Autorzy:
Dymarski, Paweł
Dymarski, Czesław
Grymajło, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/32911494.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic cylinders
piston rod extension measurement
roller rotation sensor
Opis:
The article presents the results of selected works related to the wider subject of research conducted at the Faculty of Mechanical Engineering and Shipbuilding at the Gdańsk University of Technology, regarding designing various on board devices with hydraulic drive for ships and other offshore facilities. One of the commonly used these mechanisms are hydraulic actuators with the measurement of the piston rod extension. The issue of precise measurement of the piston rod extension is extremely important in modern technologies of construction, assembly and precise displacement and positioning of large and heavy, both land and ocean engineering objects or structural elements with the use of several large hydraulic cylinders working in parallel. The article presents a one of two new patented P.425099 – A device for measuring the extension of a hydraulic cylinder piston rod. [1].
Źródło:
Polish Maritime Research; 2022, 3; 154-159
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania prędkości przy użyciu wybranego urządzenia wspomagającego ruch
Speed tests with the use of a motion assistive device
Autorzy:
Ambroszko, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/26917662.pdf
Data publikacji:
2022
Wydawca:
Wydawnictwo Instytutu Ekspertyz Sądowych
Tematy:
rolki
badania drogowe
parametry ruchu
wspomaganie ruchu
roller skates
road tests
traffic parameters
motion support
Opis:
W artykule zaprezentowano wyniki badań parametrów ruchu osoby poruszającej się na różnych rodzajach rolek. Przeprowadzono analizę i ocenę wpływu konstrukcji rolek na osiągane parametry ruchu, w szczególności na prędkości, w aspekcie możliwości wykonywania rekonstrukcji i czasowo-przestrzennych analiz zdarzeń drogowych z udziałem osób poruszających się na rolkach. Badania zostały przeprowadzone na placu manewrowym oraz podczas przejazdów długodystansowych. Do badań wykorzystano urządzenie pomiarowe VBOX Sport. Uzyskane wyniki mogą być wykorzystane w rekonstrukcji wypadków drogowych. Na zakończenie, wykorzystując program V-Sim 5.0 przeprowadzono symulację upadku na rolkach, wskazując na wartości przyspieszeń i prędkości w chwili uderzenia głową o podłoże.
The article presents the results of research on the parameters of the movement of a person moving on various types of roller skates. An analysis and evaluation of the impact of the roller skate design on the achieved traffic parameters, speeds in particular, in terms of the possibility of reconstructing road events with the participation of roller skaters and conducting time-distance analyses was carried out. The tests were carried out in various road conditions, i.e. on the maneuvering yard and over long distances. The VBOX Sport measuring device was used for the tests. Using the V-Sim version 5.0, a simulation of a fall while roller skating was carried out, indicating the values of acceleration and velocity at the moment of hitting the head on the ground. The speed results obtained in various traffic conditions can be used in time-distance analyses, and the presented material indicates the complexity of the issue a as well as the need for an in-depth analysis of a possible case.
Źródło:
Paragraf na Drodze; 2022, 2; 73-90
1505-3520
2956-3631
Pojawia się w:
Paragraf na Drodze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of combustion of qualified composite fuel for the transitional period in the household and communal sector in Poland
Autorzy:
Bembenek, Michał
Dzik, Tomasz
Smyła, Jarosław
Kozłowski, Artur
Wojtas, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/27315551.pdf
Data publikacji:
2022
Wydawca:
STE GROUP
Tematy:
microbriquette
environmentally friendly fuel
solid fuel
composite solid fuel
qualified solid fuel
roller press
Opis:
The article presents the results of laboratory combustion tests of the microbriquette obtained from useless coal (grain class of < 5 mm) generated in the production of “eco-pea” (eko-groszek) coal. The briquettes of 1.5 and 2.5 cm3 were made in a roller press of crushed coal granulation down to 2 mm, mixed with a binder and/or catalytic additives and sorbents, then dried to final moisture of about 7%. The tests were carried out on a specially designed stand enabling to determine the differential curve of the weight loss of samples heated to the ignition temperature and then burnt with laminar airflow by natural chimney draft. Comparative tests were carried out with ecopea coal from the “ZG Sobieski” mine. The results indicate that composite fuels, in the form of microbriquette, ignite faster, burn at a higher temperature and leave less ash when burned than lump coal. The greater reactivity of the briquette concerning the lump coal allows for minimizing the air rate by about 10%, which also reduces the exhaust gas volume by the same amount and the stack losses. It reduces the velocity of dust lifting, which leads to the reduction of their emission.
Źródło:
Management Systems in Production Engineering; 2022, 4 (30); Bibliogr. 40 poz., rys., tab.
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital twin of slewing roller bearings operating in wind turbine structures
Autorzy:
Krynke, Marek
Powiązania:
https://bibliotekanauki.pl/articles/24202544.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
wind turbines
quality
slewing bearings
digital twin
FEM
Industry 4.0
Opis:
A digital twin is a digital replica, a mathematical model of a given object, product, process, system, or service. A digital twin enables the attainment of a significant amount of data and it can be used to gain comprehensive knowledge about a given object, its behaviors, and reactions. The constant ability to monitor the product and its reactions contribute to its improvement and the exclusion of errors, as well as its optimization, which in turn allows for a more perfect product. This article presents a model of a digital twin for the analysis of the operation of a slewing bearing in the structure of a wind turbine. The quality of the bearing is directly related to the quality of the materials from which they were made, the process of thermo-chemical treatment, and the accuracy of all its elements, as well as its proper assembly. The bearings are characterized by very narrow tolerances. Errors in the shape of cylindricity cause distortion of the bearing raceway, stress accumulation, and jamming of rolling parts. This leads to rapid bearing wear as a result. The condition for the approval of bearings for sale is the successful passing of all tests, both geometric and strength. This is to develop quality standards that bearing suppliers must meet. The article presents an analysis of the load distribution that prevail in rotor blade bearings at the limit loads of a wind turbine. The basic types of the most commonly used coronary bearings for wind turbine applications were considered. A methodology for constructing computational models of slewing bearings, using the finite element method, was developed. An original way of simulating rolling parts with rod elements – for rollers and superelements – for the support balls was proposed. A numerical FEM model of a slewing bearing with a wind turbine rotor hub is presented. The calculations accounted for the susceptibility of the bearing rings and hub, as well as the stiffness of the mounting screws. Areas of bearing raceways, where rolling parts achieve the greatest loads, have been identified. Demonstrated by diagrams are the deformations of the rotor hub seats and bearing rings.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 71 (143); 64--71
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energia odnawialna w przestrzeni XVIII-wiecznego Poznania
Renewable Energy in the space of the 18th century Poznań
Autorzy:
Biskupski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/2160671.pdf
Data publikacji:
2022
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
energia odnawialna
przestrzeń
wiatr
woda
ukształtowanie terenu
młyn korzeczny
młyn walny
wiatrak
koźlak
wiatrak holender
odnawialne źródła energii
OZE
Poznań
XVIII w.
renewable energy
space
wind
water
terrain
root mill
roller mill
koźlak windmill
holender windmill
renewable energy sources
RES
18th century
Opis:
Wykorzystanie odnawialnych źródeł energii, takich jak słońce, woda i wiatr, nie jest zjawiskiem nowym. Kilkaset lat temu korzystanie z tych darów natury należało do codzienności tamtych społeczności i nikt nie myślał o zrównoważonym rozwoju i odnawialnej energii. Przykład XVIII-wiecznego Poznania pokazuje metody i urządzenia, które wykorzystywały odnawialne źródła energii.
The use of renewable Energy sources like sun, water and wind is not a new phenomenon. Several hundred years ago, the use of these gifts of nature was one of the everyday life of those communities and nobody was thinking about sustainable development and renewable Energy. The example of XVIII centuries of Poznań shows methods and devices that used renewable Energy sources.
Źródło:
Przegląd Budowlany; 2022, 93, 7-8; 147--150
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of the hydraulic jump length in a smooth trapezoidal channel
Autorzy:
Ngoc, Nguyen Minh
Cuong, Pham Hong
Son, Tran Thanh
Nam, Nguyen Van
Phong, Nguyen Thanh
Powiązania:
https://bibliotekanauki.pl/articles/35547843.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
jump lenght
roller length
hydraulic jump
trapezoidal channel
spillway
Opis:
The article showed the result of investigation of the length of hydraulic jump in trapezoidal channel. In this study, the basic factors that affect the length (Lj) and roller length (Lr) of hydraulic jump were investigated by physical trapezoidal channel’s model. The experiment carried out in purpose to establish a new empirical equation for calculating the roller length (Lr) of the jump in the horizontal trapezoidal channel with the upstream flow Froude number 4.0 to 9.0 (the steady jump). The hydraulic characteristics of forced jump were measured and statistically calculated by excel software. The results of data analysis showed that the MAPE was relatively small (< 5%), and R2 > 0.9 (strong correlation between predicted and observed values) and other statistical indicators are less than 0.1 (MSE = 0.004, RMSE = 0.062 và MEA = 0.047). Therefore, the equation found could be appropriated and applied to calculate characteristics of hydraulic jump trapezoidal channel.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2022, 31, 1; 63-76
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 182

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