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Wyświetlanie 1-15 z 28
Tytuł:
Theoretical investigation of stresses induced at blade mounting locations in steam turbine rotor system
Autorzy:
Prasad, D. K.
Ramana, K. V.
Rao, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/947280.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
tarcza wirnika
wirnik turbiny parowej
naprężenie styczne
rotor disc
radial stress
tangential stress
steam turbine rotors
Opis:
One of the most common incipient losses of integrity in mechanical structures is the development and propagation of cracks. Especially in rotating members like steam turbine rotors etc. cracks, because of their potential, cause catastrophic failures and are a grave threat to an uninterrupted operation and performance. A crack may propagate from some small imperfections on the surface of the body or inside of the material and it is most likely to appear in correspondence to high stress concentration. Crack propagation path is generally determined by the direction of maximum stress or by the minimum material strength. Hence determination of stresses induced has been the focus of attention for many researchers. In the present work, development of a mathematical model to determine the stresses induced in a rotating disc of varying thickness is studied. This model is applied to a steam turbine rotor disc to determine the induced stresses and radial deflection. The mathematical modeling results are validated with the results obtained using Ansys package. The results of the present study will be useful in diagnosing the location and magnitude of maximum stress induced in the turbine rotor disc and stress intensity factor due to the presence of crack.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 295-307
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of thermal modulation on double diffusive convection in the presence of applied magnetic field and internal heat source
Autorzy:
Manjula, S. H.
Suresh, P.
Rao, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/1839901.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza nieliniowa
płyn newtonowski
konwekcja
thermal modulation
weak nonlinear analysis
internal heating
newtonian fluid
double diffusive convection
Opis:
The investigation of thermal modulation on double-diffusive stationary convection in the presence of an applied magnetic field and internal heating is carried out. A weakly nonlinear stability analysis has been performed using the finite-amplitude Ginzburg-Landau model. This finite amplitude of convection is obtained at the third order of the system. The study considers three different forms of temperature modulations. OPM-out of phase modulation, LBMO-lower boundary modulation, IPM-in phase modulation. The finite-amplitude is a function of amplitude ,Tδ frequency ω and the phase differenceθ . The effects of Tδ and ω on heat/mass transports have been analyzed and depicted graphically. The study shows that heat/mass transports can be controlled effectively by thermal modulation. Further, it is found that the internal Rayleigh number iR enhances heat transfer and reduces the mass transfer in the system.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 135-155
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dynamics of the Forest Graph Operator
Autorzy:
Dara, Suresh
Hegde, S.M.
Deva, Venkateshwarlu
Rao, S.B.
Zaslavsky, Thomas
Powiązania:
https://bibliotekanauki.pl/articles/31340605.pdf
Data publikacji:
2016-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
forest graph operator
graph dynamics
Opis:
In 1966, Cummins introduced the “tree graph”: the tree graph \( \textbf{T} (G) \) of a graph \( G \) (possibly infinite) has all its spanning trees as vertices, and distinct such trees correspond to adjacent vertices if they differ in just one edge, i.e., two spanning trees \( T_1 \) and \( T_2 \) are adjacent if \( T_2 = T_1 − e + f \) for some edges \( e \in T_1 \) and \( f \notin T_1 \). The tree graph of a connected graph need not be connected. To obviate this difficulty we define the “forest graph”: let \( G \) be a labeled graph of order \( \alpha \), finite or infinite, and let \( \mathfrak{N}(G) \) be the set of all labeled maximal forests of \( G \). The forest graph of \( G \), denoted by \( \textbf{F} (G) \), is the graph with vertex set \( \mathfrak{N}(G) \) in which two maximal forests \( F_1 \), \( F_2 \) of \( G \) form an edge if and only if they differ exactly by one edge, i.e., \( F_2 = F_1 − e + f \) for some edges \( e \in F_1 \) and \( f \notin F_1 \). Using the theory of cardinal numbers, Zorn’s lemma, transfinite induction, the axiom of choice and the well-ordering principle, we determine the F-convergence, F-divergence, F-depth and F-stability of any graph \( G \). In particular it is shown that a graph \( G \) (finite or infinite) is F-convergent if and only if \( G \) has at most one cycle of length 3. The F-stable graphs are precisely \( K_3 \) and \( K_1 \). The F-depth of any graph \( G \) different from \( K_3 \) and \( K_1 \) is finite. We also determine various parameters of \( \mathbf{F} (G) \) for an infinite graph \( G \), including the number, order, size, and degree of its components.
Źródło:
Discussiones Mathematicae Graph Theory; 2016, 36, 4; 899-913
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of densities, viscosities and ultrasonic speeds of binary mixtures containing isopropyl alcohol and ketones at different temperatures
Autorzy:
Srinivas, S. S. J.
Tulasi Koteswari Bai, B.
Babu Rao, K.
Narendra, K.
Sarath Babu, M.
Powiązania:
https://bibliotekanauki.pl/articles/412144.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ultrasonic velocity
density
viscosity
acoustic parameters
Opis:
The densities, viscosities and ultrasonic velocities of binary liquid mixtures of Isopropyl alcohol with acetophenone and methyl isobutyl ketone (MIBK) have been measured at temperatures 298.15 and 308.15 K over the entire range of mole fraction. From these data, acoustical parameters such as adiabatic compressibility (β), free volume (Vf) and free length (Lf) have been estimated using the standard relations. The results are interpreted in terms of molecular interactions present in the mixtures.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 151-158
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric Optimization for Producing Semi-Solid A383 Alloy using Cooling Slope Casting Process
Autorzy:
Rao, M. S.
Khandelwal, Himandshu
Kumar, M.
Kumar, A.
Powiązania:
https://bibliotekanauki.pl/articles/27314114.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
alloy A383
semi-solid alloys
casting process
cooling
hardness
non-dendritic microstructur
stop A383
stopy półstałe
proces odlewania
chłodzenie
twardość
mikrostruktura
Opis:
Cooling slope casting is a simple technique to produce semi-solid feedstock with a non-dendritic structure. The cooling slope technique depends on various parameters like slope length, slope angle, pouring temperature etc, that has been investigated in the present study. This work presents an extensive study to comprehend the combined effect of slope angle, slope length, pouring temperature, on hardness and microstructure of A383 alloy. Response Surface Methodology was adopted for design of experiments with varying process parameters i.e. slope angle between 15o to 60o, slope length between 400 to 700 mm, and pouring temperature between 560 oC to 600 oC. The response factor hardness was analysed using ANOVA to understand the effect of input parameters and their interactions. The hardness was found to be increasing with increased slope length and pouring temperature; and decreased with slope angle. The empirical relation for response with parameters were established using the regression analysis and are incorporated in an optimization model. The optimum hardness with non-dendritic structure of A383 alloy was obtained at 27o slope angle, 596.5 mm slope length and 596 oC pouring temperature. The results were successfully verified by confirmation experiment, which shows around 2% deviation from the predicted hardness (87.11 BHN).
Źródło:
Archives of Foundry Engineering; 2023, 23, 1; 43--52
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Packing in Orlicz sequence spaces
Autorzy:
Rao, M. M.
Ren, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1218867.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
packing constant
quantitative index
interpolation
Opis:
We show how one can, in a unified way, calculate the Kottman and the packing constants of the Orlicz sequence space defined by an N-function, equipped with either the gauge or Orlicz norms. The values of these constants for a class of reflexive Orlicz sequence spaces are found, using a quantitative index of N-functions and some interpolation theorems. The exposition is essentially selfcontained.
Źródło:
Studia Mathematica; 1997, 126, 3; 235-251
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Object-parameter approaches to predicting unknown data in an incomplete fuzzy soft set
Autorzy:
Liu, Y.
Qin, K.
Rao, C.
Alhaji Mahamadu, M.
Powiązania:
https://bibliotekanauki.pl/articles/331019.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fuzzy soft set
incomplete fuzzy soft set
object parameter approach
prediction
similarity measures
zbiór rozmyty
podejście obiektowe
miara podobieństwa
Opis:
The research on incomplete fuzzy soft sets is an integral part of the research on fuzzy soft sets and has been initiated recently. In this work, we first point out that an existing approach to predicting unknown data in an incomplete fuzzy soft set suffers from some limitations and then we propose an improved method. The hidden information between both objects and parameters revealed in our approach is more comprehensive. Furthermore, based on the similarity measures of fuzzy sets, a new adjustable object-parameter approach is proposed to predict unknown data in incomplete fuzzy soft sets. Data predicting converts an incomplete fuzzy soft set into a complete one, which makes the fuzzy soft set applicable not only to decision making but also to other areas. The compared results elaborated through rate exchange data sets illustrate that both our improved approach and the new adjustable object-parameter one outperform the existing method with respect to forecasting accuracy.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 1; 157-167
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loadability maximisation in bilateral network for real-time forecasting system using cuckoo search algorithm
Autorzy:
Venkatasivanagaraju, S.
Rao, M. Venkateswara
Powiązania:
https://bibliotekanauki.pl/articles/38699704.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
optimal power flow
NR method
short-term load forecasting
long-term load forecasting
cuckoo search algorithm
optimisation
loss minimisation
optymalny przepływ mocy
metoda NR
krótkoterminowe prognozowanie obciążeń
długoterminowe prognozowanie obciążeń
algorytm kukułki
optymalizacja
minimalizacja strat
Opis:
This manuscript proposes an optimal power flow (OPF) solution in a coordinated bilateralpower network. The primary goal of this project is to maximise the benefits of the powermarket using Newton–Raphson (NR) and cuckoo search algorithm CSA methodologies.The global solution is found using a CSA-based optimisation approach. The study isconducted on real-time bus system. To avoid this, creative techniques have lately beenused to handle the OPF problem, such as loadability maximisation for real-time predictionsystems employing the CSA. In this work, cuckoo search (CS) is used to optimise theobtained parameters that help to minimise parameters in the predecessor and consequentunits of each sub-model. The proposed approach is used to estimate the power load in thelocal area. The constructed models show excellent predicting performance based on derivedperformance. The results confirm the method’s validity. The outcomes are compared withthose obtained by using the NR method. CSA outperformed the other methods in thisinvestigation and gave more accurate predictions. The OPF problem is solved via CSAin this study. Implementing a real-time data case bus system is recommended to test theperformance of the established method in the MATLAB programme.
Źródło:
Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 73-88
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Rock Properties on Wear of M and SR Grade Rubber with Varying Normal Load and Sliding Speed
Autorzy:
Pal, S. K.
Rao, K. U. M.
Kumar, P. S.
Rajasekar, R.
Powiązania:
https://bibliotekanauki.pl/articles/356996.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rock
rubber
wear
shear strength
surface roughness
Opis:
Rubbers are interesting materials and are extensively used in many mining industries for material transportation. Wear of rubber is a very complex phenomenon to understand. The present study aims to explain the influence of rock properties on wear of M and SR grade rubber used in top cover of conveyor belts. Extensive laboratory experiments were conducted under four combinations of normal load and sliding speed. The wear of both the rubber types were analyzed based on the rock properties like shear strength, abrasivity index and fractal dimension. A fully instrumented testing set up was used to study the wear of rubber samples under different operating conditions. In general, wear was higher for M grade rubber compared to SR grade rubber. Increase in shear strength of rocks depicts decreasing trend for the wear of M and SR grade rubber at lower load conditions. Moreover, a higher load combination displays no definite trend in both the rubbers. The strong correlation between the wear of rubber and frictional power for all rubber-rock combinations has given rise to the parameter A, which reflects the relative compatibility between the rubber and rock. Increase of Cerchar’s Abrasivity Index of rocks shows gradual enhancement in wear for M grade rubber in all the load and speed combinations whereas, it fails in SR grade rubber due to its higher strength. The wear of rubber tends to decrease marginally with the surface roughness of rocks at highest normal load and sliding speed in M grade rubber. However, the wear of M and SR grade rubber is influenced by the surface roughness of rocks.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1787-1793
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of traffic congestion on urban arterials for heterogeneous traffic
Identificación de la congestión del tráfico en las zonas urbanas para el tráfico arterials heterogéneos
Autorzy:
Rao, M. A.
Rao, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/374232.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
traffic congestion
congestion identification
congestion speed
identyfikacja przeciążenia
szybkość przeciążenia
Opis:
With the rapid growth of urban traffic, the gap between traffic demand and supply is increasing by the day, and traffic congestion has become a part of urban Indian life. The following aspects have become important for transportation planners and managers: identification of the frequently congested road sections, estimating their influence on the entire road network, and improving the connectivity and accessibility of the whole road network. Identification of congestion metric is the first step in such endeavour as it would be of help in selecting appropriate remedial measures. This paper presents some insights on how to identify the traffic congestion and establish the congestion thresholds on urban arterials. Stream speed emerges as one of the candidate metrics in identifying congestion on urban arterials. Further, speed studies conducted on an interrupted heterogeneous mix of vehicles plying Delhi urban arterials is also presented.
Con el rápido crecimiento del tráfico urbano, la brecha entre la demanda y la oferta de tráfico está aumentando día a día, y la congestión del tráfico se ha convertido en una parte de la vida de los indios urbanos. Los siguientes aspectos se han convertido en importantes para los planificadores y gestores de transporte: identificación de los tramos de carretera congestionada frecuentemente, estimar su influencia en toda la red de carreteras y la mejora de la conectividad y accesibilidad de toda la red de carreteras. Identificación de métricas de congestión es el primer paso en esa tarea, ya que sería de gran ayuda en la selección de medidas correctivas adecuadas. Este trabajo presenta algunas ideas sobre cómo identificar la congestión del tráfico y establecer los umbrales de la congestión urbana arterials. Velocidad de flujo emerge como uno de los candidatos en la identificación de métricas de congestión en arterials urbano. Además, los estudios efectuados sobre la velocidad se interrumpa una mezcla heterogénea de vehículos que recorren Delhi arterials urbano también es presentado.
Źródło:
Transport Problems; 2016, 11, 3; 131-142
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global scenario of Acrocarpus fraxinifolius Wight and Arn. - A future tree of Agro forestry
Autorzy:
Mishra, G.
Pandey, A.K.
Arunachalam, M.K.
Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/11909.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Acrocarpus fraxinifolius portrait one among the mainstay of agro forestry in Asian tropics. The lofty tree fortified a substantial impact in every horizon of life. The evergreen, deciduous tree of Fabaceae family stands tall about 30-60 m endowed with unique properties which idiosyncrasies it in the plant kingdom. Surpassing the adverse climatic conditions, A. fraxinifolius serves as a shade tree for tea and coffee plantation and epitomises as a multipurpose avenue tree culminating to the culture of agro forestry. Mundani in bloom is a spectacular appearance bestowed with scarlet crimson red flowers attracting infinite migratory birds and insects. The ancestral gene with indelible memory gravitate this extraordinary majestic tree to aestivate and adapt to strongest survive.
Źródło:
International Letters of Natural Sciences; 2015, 03
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Reconfigurable Split Ring Antenna for LTE And WiMAX Applications
Autorzy:
Madhav, B. T. P.
Nadh, B.
Anilkumar, T.
Pardhasaradhi, P.
Rao, M. C.
Lakshman, P.
Powiązania:
https://bibliotekanauki.pl/articles/226800.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PIN diode
WiMAX
LTE 2500
split ring antenna
BAR64-02V
Opis:
This paper presents frequency reconfigurable dual band antenna for WiMAX and LTE 2500 band applications using four PIN diode switches. The antenna is compact in size with dimensions of 30 x 30 x 0.8 mm3 and designed on FR-4 dielectric substrate with a partial ground plane. The fabricated antenna operates in the frequency range of LTE and WiMAX (2.5-2.69 GHz and 3.4-3.6 GHz) respectively. The frequencies can be controlled by using PIN diodes and antenna attained the gain ranging of 3.34-4.46 dBi. This designed antenna resonating at 2.52 and 3.49 GHz when the PIN diodes are in ON state and resonating at 2.68 and 3.58 GHz when PIN diodes are in OFF state. The proposed antenna has bidirectional radiation at upper frequency bands and unidirectional at lower frequency bands. The proposed split ring structured antenna has the radiation efficiency of 94.12% at 2.52 GHz and 90.34% at 3.49 GHz in ON state. Antenna providing good agreement between the measured (Antenna measurement setup with VNA) and simulated results (Ansys-HFSS).
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 2; 255-260
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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