Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "low load" wg kryterium: Temat


Tytuł:
Possibility of the steam production increase in the selected smoke tube exhaust gas boiler under the low load of the electronically controlled low speed marine prime mover
Autorzy:
Tuński, T.
Powiązania:
https://bibliotekanauki.pl/articles/359604.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
fuel common rail
steam production
low load
ambient conditions
Opis:
Modern marine Diesel prime movers are equipped with so called ‘common rail’ as a part installed in the fuel injection system. This kind of design, gives a possibility to control fuel injection process in ways which were not available to carry out on conventionally designed engines. During the ship operation with a reduced speed and reduced load of the main engine, especially under the “Super Slow Steaming” conditions the waste heat recovery process in exhaust gas boiler is being disturbed. In the article, there is presented a possibility to increase the steam production of the waste heat boiler by interference in the fuel injection pattern for the engine. For the selected system “low speed main engine – smoke tube exhaust gas boiler” the test session has been carried out under the real ambient and operational condition of the ship to verify described possibility. Obtained results have been presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 38 (110); 96-100
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fatigue testing in complex stress state in the context of problems in the diagnosis and detecting defects in materials of wheels in locomotives
Autorzy:
Czapczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/241777.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
multiaxial fatigue
bending
twisting
low cycle load
high cycle load
axles of locomotives
Opis:
This paper presents preliminary results of fatigue tests of selected construction materials, which have been exposed to the simultaneous operation of the bending and torsional loads at different mix of these loads. This kind of load generally applies to much responsible construction, especially of machinery for transport. For example, rail transport is one of the most popular measures, which uses different types of locomotives. However, it is no matter what sort of the type of railway vehicle it is, because in each there we can notice a multi-axis load driving axle wheel assemblies. During the technical inspection of these items, ultrasonic flaw detectors are used to detect damage in the material that arose during the exploitation, but are not visible during the external inspection. For this reason, there are many problems, that arise during the diagnostic process using ultrasonic flaw detectors, because it is not always possible to accurately detect the resulting or arising defect in the material axes, especially in some of the built-axes, which can be studied only from the front (on both sides of the mounting of bearings). Taking into account the safety and technical problems in rail transport, it is important to carry out fatigue tests of low- and high-cycles on samples subjected to multiaxial stress state. Initially, there were taken into account the lightweight aluminum (AlMg2Mn0.47Fe0.5) that have been repeatedly multiaxial charged at different percentage of bending and twisting. The results will be referenced to the occurrence of the bending and twisting, as well as to the results obtained with the simultaneous influence of corrosive conditions due to the attempt to make the best possible mapping of the prevailing conditions in which different structural elements must actually work. The load on the low cycle fatigue and high cycle fatigue were chosen after corrosion- stress testing on the same aluminum alloy. In addition, cases of multiaxial fatigue are not as described and explained in detail as the cases of uniaxial fatigue. In spite of this fact, it is necessary to create detailed criterions for multiaxial with low- and high-cycles load.
Źródło:
Journal of KONES; 2012, 19, 4; 149-154
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of surfaces for characterization of fungal burden – Does it matter?
Autorzy:
Viegas, Carla
Faria, Tiago
Meneses, Márcia
Carolino, Elisabete
Viegas, Susana
Gomes, Anita Q.
Sabino, Raquel
Powiązania:
https://bibliotekanauki.pl/articles/2177424.pdf
Data publikacji:
2016-05-12
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
surface samples
fungal burden assessment
high fungal load settings
low fungal load settings
air samples
occupational environments
Opis:
Objectives Mycological contamination of occupational environments can be a result of fungal spores’ dispersion in the air and on surfaces. Therefore, it is very important to assess it in both types of the samples. In the present study we assessed fungal contamination in the air and in the surface samples to show relevance of surfaces sampling in complementing the results obtained in the air samples. Material and Methods In total, 42 settings were assessed by the analysis of air and surfaces samples. The settings were divided into settings with a high fungal load (7 poultry farms and 7 pig farms, 3 cork industries, 3 waste management plants, 2 wastewater treatment plants and 1 horse stable) and a low fungal load (10 hospital canteens, 8 college canteens and 1 maternity hospital). In addition to culture-based methods, molecular tools were also applied to detect fungal burden in the settings with a higher fungal load. Results From the 218 sampling sites, 140 (64.2%) presented different species in the examined surfaces when compared with the species identified in the air. A positive association in the high fungal load settings was found between the presence of different species in the air and surfaces. Wastewater treatment plants constituted the setting with the highest number of different species between the air and surface. Conclusions We observed that surfaces sampling and application of molecular tools showed the same efficacy of species detection in high fungal load settings, corroborating the fact that surface sampling is crucial for a correct and complete analysis of occupational scenarios.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 4; 623-632
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-static and low-cycle system for the application of small loads in testing devices
Quasi-statyczny i niskocyklowy układ do wywierania małych obciążeń w urządzeniach testujących
Autorzy:
Neska, M.
Powiązania:
https://bibliotekanauki.pl/articles/257191.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
układ sterowania
obciążenie quasi-statyczne
obciążenie niskocyklowe
zginanie
skręcanie
control system
quasi-static load
low-cycle load
bending
torsion
Opis:
The article presents the control system for the initiation of quasi-static and low-cycle bending and torsional loads that is intended for fatigue endurance tests in which the maximum value of the load imposed is calibrated electrically or mechanically. The components of the developed system are presented together with examples of the practical application of the system in testers for printed objects.
W artykule przedstawiono układ sterowania do wywierania quasi-statycznych i niskocyklowych małych obciążeń zginających i skręcających dedykowany do badania wytrzymałości zmęczeniowej obiektów w urządzeniach testujących, w których kalibracja maksymalnej wartości wywieranego obciążenia odbywa się w sposób elektryczny lub mechaniczny. Przedstawiono elementy składowe opracowanego układu sterowania oraz zaprezentowano przykładowe aplikacje układu w testerach wyrobów poligraficznych.
Źródło:
Problemy Eksploatacji; 2012, 3; 121-131
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of notch stress-strain correction methods to low-cycle fatigue life prediction of turbine rotors subjected to thermomechanical loads
Autorzy:
Banaszkiewicz, M.
Dudda, W.
Powiązania:
https://bibliotekanauki.pl/articles/386989.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
low-cycle fatigue
turbine rotors
thermo-mechanical load
Opis:
The paper analyses the possibility of using analytical methods of notch stress-strain correction in low-cycle fatigue life predictions of steam turbine rotors operating under non-isothermal conditions. The assessment was performed by comparing strain amplitudes calculated using the Neuber and Glinka-Molski methods and those predicted by the finite element analysis (FEA) employing elastic-plastic material model. The results of investigations reveal that the Neuber method provides an upper bound limit, while the GlinkaMolski method results in a lower bound limit of strain amplitude. In the case of rotor heat grooves, both methods provide equally accurate results of notch strain amplitude and are suited to estimating lower and upper bound limits of low-cycle fatigue life under non-isothermal conditions.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 3; 179-185
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of long term low water level in the mountain river catchments area
Autorzy:
Kopacz, Marek T.
Kowalewski, Zbigniew
Santos, Luis
Mazur, Robert
Lopes, Vasco
Kowalczyk, Agnieszka
Bar-Michalczyk, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/2048521.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
land use changes
low water level
nitrogen load
phosphorus load
small mountain catchments
Opis:
Changing atmospheric conditions, including above all the deepening extreme weather phenomena, are increasing from year to year. This, in consequence, causes an increase in the incidence of low outflows. The study compares low water levels for two catchments: Biała Woda and Czarna Woda, and phosphorus and nitrogen load using the Nutrient Delivery Ratio (NDR) model in InVEST software. The objective of the NDR is to map nutrient sources from catchment area and transfer to the river bed. The nutrient loads (nitrogen and phosphorus) spread across the landscape are determined based on a land use (LULC) map and associated loading rates described in literature. The studies have shown that low water levels have been more common recently and pose the greatest threat to the biological life in the aquatic ecosystems. The structure of land use is also of great importance, with a significant impact on the runoff and nitrogen and phosphorus load. Phosphorus and runoff from surface sources to the water of Biała Woda and Czarna Woda catchments area has been reduced in forested areas. Only higher run-offs are observed in the residential buildings zone. The nitrogen load was also greater in the lower (estuary) parts of both catchments, where residential buildings dominate.
Źródło:
Journal of Water and Land Development; 2021, 51; 225-232
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study on the Melting Temperature, Microstructural and Improved Mechanical Properties of Sn58Bi/Cu Solder Alloy Reinforced with 1%, 2% and 3% Zirconia (ZrO2) Nanoparticles
Autorzy:
Amares, S.
Durairaj, R.
Kuan, S. H.
Powiązania:
https://bibliotekanauki.pl/articles/2049682.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SnBi solder
low melting temperature
microstructure
hardness
shear load
Opis:
This paper investigates the influence of 1%, 2% and 3% zirconia (ZrO2) nanoparticles to the melting, microstructural and mechanical properties of the Sn58Bi solder. Melting temperatures of 145.11°C, 140.89°C and 143.84°C were attained correspondingly for the 1%, 2% and 3% ZrO2 reinforced Sn58Bi solder. The microstructures especially the spacing between the lamellar structures of the Sn58Bi solder alloy was narrower for 1% ZrO2 added with Sn58Bi solder alloy. The highest and lowest hardness value of 32.28 HV and 27.62 HV was recorded for 1% and 2% ZrO2 additions respectively. Highest shear strength value was noted for the 3% ZrO2 added SnBi/Copper joint with 0.8712 kN, while the lowest value of 0.4380 kN noted for the 1% ZrO2 added SnBi/Copper joint. The presence of small-sized ZrO2 nanoparticles can be seen to be properly dispersed at the solder joint to increase the shear load at maximum joint stress.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 407-418
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Design Methodology For Enhancing The Transient Loading Of Low Drop-out Regulators (LDRs)
Autorzy:
Abdel-Monem, Ahmed
El-Mashade, Mohamed B.
Dabbous, T. E.
Powiązania:
https://bibliotekanauki.pl/articles/227180.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low drop-out regulator
cross coupling
jumps of the load current
undershot
overshot
Opis:
A new simple design methodology which makes LDR output nearly insensitive to jumps of the load current for long times is proposed. This methodology is tested for more than 10⁴ seconds. Our procedure leans on cross coupling of the time second derivative of the LDR power transistor gate and drain voltages along with their currents. This technique keeps low values of these currents in order of nano or hundreds of micro amperes for undershot or overshot cases, respectively. The introduced methodology has been applied to a standard CMOS of 0.18μm technology for NMOS transistors and validated using MATLAB R2014a.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 319-327
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of pavement moisture content on the load-bearing capacity of forest road
Autorzy:
Grajewski, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/100971.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
light weight deflectometer
LWD
static load-bearing test
VSS
very low-volume roads
Opis:
The aim of the study was to analyse the interaction between pavement moisture content and load-bearing capacity of an unpaved forest road. The selected experimental road sector was divided into three sections (A, B and C), which were flooded with three different amounts of water 10 mm (section A), 20 mm (section B) and 30 mm (section C), compared with the intense rainfall. Three series of tests were conducted at each section: prior to flooding (1st day of measurements), during the first 24 hours after flooding (2nd day) and during the next 24 hours after flooding (3rd day of measurements). Moisture content of structural layers of the road (surface course, base course and subbase course) were determined and the measurements using a light weight deflectometer (Evd, s/v) and a static plate (E1 , E2 , Io ) were conducted. Recorded averaged results clearly indicate a negative effect of an increase in pavement layers moisture content (e.g. resulting from heavy rainfall) on the forest road carrying capacity and on compaction parameters of its layers. On the third day of the measurements a decrease in the analysed modulus, on average between 16% (E2 ) and 25% (Evd) was observed, but a decrease in compaction by 16% (s/v) and 4% (Io).
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2016, IV/2; 1451-1462
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the effect of exceeding the allowable values of selected parameters of the receivers on operating conditions of a low voltage network
Autorzy:
Nawrowski, R.
Stein, Z.
Zielińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/97549.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
low voltage network
electric power system
degree voltage asymmetry
transformer load asymmetry
synchronous generator
Opis:
Minimum value of the power factor of an electric power network is constrained and its value is determined by the regulations. Customer of electric power is responsible for maintenance of proper value of the power factor. On the other hand, minor electric power customers are not charged with any financial consequences for disregarding proper value of the parameter, in spite of the fact that the distribution companies are charged with the cost of increased power losses. Moreover, the degree of voltage asymmetry of electric power network is constrained and its value is defined by the regulations too. Asymmetry of output voltage of power transformer is caused chiefly by asymmetric loads. The paper presents a proposal of estimating additional power losses caused by reduced value of the power factor and analyzes the effect of various types of load asymmetry on the value of the asymmetry factor. The proposals and analyzes are carried out with the help of Mathcad software.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 128-140
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of interval damping ratio under uncertain load in power system
Autorzy:
Xing, J.
Chen, C.
Wu, P.
Powiązania:
https://bibliotekanauki.pl/articles/201058.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
low frequency oscillation
interval load
interval damping ratio
successive linear programming method
Opis:
The problem of small-signal stability considering load uncertainty in power system is investigated. Firstly, this paper shows attempts to create a nonlinear optimization model for solving the upper and lower limits of the oscillation mode’s damping ratio under an interval load. Then, the effective successive linear programming (SLP) method is proposed to solve this problem. By using this method, the interval damping ratio and corresponding load states at its interval limits are obtained. Calculation results can be used to evaluate the influence of load variation on a certain mode and give useful information for improvement. Finally, the proposed method is validated on two test systems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 151-158
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of increased temperature of lower end-fitting of a composite long rod insulator on its mechanical strength under variable loads
Autorzy:
Bielecki, Jerzy
Kotowski, Piotr
Wańkowicz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/24202743.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
composite suspension line insulators
high temperature low sag
HTLS
conductor
mechanical insulator strength
material fatigue
insulator tests
cyclic load
changing load
Opis:
This paper describes results of tensile mechanical strength testing of two types of composite suspension line insulators from two manufacturers. In order to take into account the operation of composite insulators in overhead transmission lines with high-temperature low-sag (HTLS) conductors, the testing of their static and fatigue strength was performed at both ambient and elevated temperatures. The results showed that the static mechanical strength of composite insulators decreased with an increase in the temperature of the lower end fitting of the insulator, and proved that it followed a third-degree polynomial function. Calculations performed demonstrated that a significant cause of reduction in strength was the increase in the radial stress following the temperature increase in the crimped glassepoxy resin core of the insulator. The results of the fatigue strength testing demonstrated that the increase in the temperature of the lower end fitting of the insulator up to 85°C degree had a little effect on the fatigue strength of the tested composite insulators.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 392--405
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Hydraulic Load of a Local WWTP in the South-Eastern Poland Including Hydraulic Capacity of the Sewage Receiver
Autorzy:
Młyńska, Anna
Młyński, Dariusz
Chmielowski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2202274.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
hydraulic load
sewage
sewage receiver
sewage outflow
mean low flow
SNQ
wastewater treatment plant
WWTP
Opis:
The paper constitutes the analysis of hydraulic load of a local wastewater treatment plant in the south-eastern Poland along with the analysis of sewage receiver hydraulic capacity and related receiving waters protection. Assuming that the daily outflow of treated sewage should not exceed 10% of the mean-low flow (SNQ) of the receiver, no case of daily sewage outflow greater than 10%·SNQ = 51 840 m3·d-1 was recorded. Moreover, average daily hydraulic load of the treatment plant was lower than the limit value by over 70% and the maximum recorded value – by over 40%. Furthermore, the conducted analysis shows that the particular months differed from each other in the values of the daily hydraulic load of the wastewater treatment plant at the outflow; May was the month with the highest average daily sewage outflow, while September was characterized by the lowest average daily outflow of treated sewage. There was also no clear dependence between the hydraulic load of the WWTP and the day of the week. Daily sewage outflows ranging from 10 000 m3·d-1 to 12 000 m3·d-1 constituted the largest part of all observations. The daily sewage outflows directed to the receiver prove that there is no threat to the preservation of the water environment quality.
Źródło:
Journal of Ecological Engineering; 2022, 23, 11; 261--272
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of higher harmonics generation by non-linear loads
Analiza wytwarzania wyzszych harmonicznych przez odbiorniki nieliniowe
Autorzy:
Necka, K.
Powiązania:
https://bibliotekanauki.pl/articles/793595.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
nonlinear load
distortion factor
higher harmonics
oscillogram
low-voltage grid
transformer station
supply voltage
supply current
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Load History on Durability of P92 Steel Used for the Construction of Energy Pipelines
Wpływ historii obciążenia na trwałość stali P92 stosowanej do budowy rurociągów energetycznych
Autorzy:
Cieśla, M.
Junak, G.
Powiązania:
https://bibliotekanauki.pl/articles/354060.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
P92 steel
load history
creep
low-cycle fatigue
stal P92
wysokoobciążone bloki energetyczne
pełzanie
zmęczenie niskocyklowe
Opis:
The research material used in the study was the martensitic creep-resistant steel P92 used for the manufacture of pipes being part of power generation units subject to heavy load. The research problem focused on two issues. The first one was to analyze how the plastic deformation cumulated in the material in low-cycle fatigue conditions affects the characteristics of the material in creep conditions in a temperature of 600ºC. The other one was concerned with analysis of a reverse situation, i.e. how the initial plastic deformation of the material in creep conditions changes the mechanical characteristics of the steel under low-cycle fatigue conditions in a temperature of 600ºC.
W pracy materiałem badawczym była żarowytrzymała stal martenzytyczna P92 wykorzystywana do wytwarzania rur wchodzących w skład wysokoobciążonych bloków energetycznych. Problem badawczy koncentrował się na dwóch zagadnieniach. W pierwszym analizowano jak odkształcenie plastyczne kumulowane w materiale w warunkach procesu zmęczenia niskocyklowego wpływa na charakterystyki materiału w warunkach pełzania w temperaturze 600ºC. W drugim analizowano sytuację odwrotną, tzn. jak wstępna deformacja plastyczna materiału w warunkach pełzania zmienia charakterystyki mechaniczne stali w warunkach zmęczenia niskocyklowego w temperaturze 600ºC.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 1853-1857
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies