Temat: non-homogeneous - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Estimation of energy storage rate during macroscopic non-homogeneous plastic deformation of polycrystalline materials
Oszacowanie zdolności magazynowania energii podczas makroskopowo niejednorodnrj deformacji plastycznej w polikryształach
Autorzy:: Oliferuk, W.
Korbel, A.
Bochniak, W.
Powiązania:: https://bibliotekanauki.pl/articles/281870.pdf
Data publikacji:: 2004
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: energy storage rate
non-homogeneous deformation
energy relase
Opis:: The experimental method of estimation of the energy storage rate .../... in the stage of macroscopic non-homogeneous plastic deformation is presented (is the stored energy and ... is the energy expended in the plastic deformation). A non-uniform temperature distribution on the surface of the loaded sample as an experimental indicator of the macroscopic non-homogeneous plastic deformation is used. It is shown that during the development of strain localization, a part of the energy stored in the deformed material during previous deformation is relased in the form of heat.
Przedstawiono metodę szacowania zdolności magazynowania energii .../... w zakresie makroskopowo niejednorodnej deformacji plastycznej (... - energia zmagazynowana, ... - energia zużyta podczas deformacji plastycznej). Jako wskaźnik niejednorodnej deformacji przyjęto nierównomierny rozkład temperatury na powierzchni deformowanej próbki. Pokazano, że w końcowej fazie niejednorodnej deformacji, podczas rozwoju makroskopowej lokalizacji odkształcenia część energii zmagazynowanej we wcześniejszym etapie deformacji wydziela się w postaci ciepła.
Źródło:: Journal of Theoretical and Applied Mechanics; 2004, 42, 4; 817-826
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Thermal creep stress and strain analysis in a non-homogeneous spherical shell
Autorzy:: Thakur, P.
Singh, S. B.
Pathania, D. S.
Verma, G.
Powiązania:: https://bibliotekanauki.pl/articles/949332.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: stress
strain rates
thermal
spherical shell
non-homogeneous
Opis:: The purpose of this paper is to present study of thermal creep stress and strain rates in a non-homogeneous spherical shell by using Seth’s transition theory. Seth’s transition theory is applied to the problem of creep stresses and strain rates in the non-homogeneous spherical shell under steady-state temperature. Neither the yield criterion nor the associated flow rule is assumed here. With the introduction of thermal effect, values of circumferential stress decrease at the external surface as well as internal surface of the spherical shell. It means that the temperature dependent materials minimize the possibility of fracture at the internal surface of the spherical shell. The model proposed in this paper is used commonly as a design of chemical and oil plants, industrial gases and stream turbines, high speed structures involving aerodynamic heating.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1155-1165
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Solutions of recurrence and summation equations and their applications in slide bearing wear calculations
Autorzy:: Wierzcholski, K.
Powiązania:: https://bibliotekanauki.pl/articles/246728.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wear prognosis
HDD micro-bearings
recurrence non-homogeneous equation
Opis:: The investigations under the paper include a derivation of a non-homogenous recurrence equation of the second and higher orders with variable coefficients, whose particular solutions, with the boundary conditions set and obtained from experimental measurements, will be the sequences of the wear value of the bearing in the successive years of operation. Owing to these investigations, it will be possible to predict for example the wear values of slide bearings. Moreover, this paper presents the some particular applications of recurrence equations with regard to the calculation prognosis of micro-bearing parameters such as friction forces, friction coefficients and wear. Recurrence equations are presented in a form of difference equations where the unknown functions occur as the main terms of the sequence of inquired values. In this paper, the properties of the particular values of recurrence equations are defined. Possibility of modulation and control of mentioned problem belong to the artificial intelligence of HDD microbearing. Presented problem describes not continuous relations hence determines the mathematical and numerical solutions in discrete spaces. Properly in the case of continuous functions, the mentioned recurrence equations have the same meaning as differential equations. Recurrent equations for discrete function correspond to differential equations for the continuous function. In final conclusions, the application of presented theory in this paper contains the numerical solutions referring the wear values of HDD bearing system in the indicated period of operating time.
Źródło:: Journal of KONES; 2012, 19, 2; 543-550
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Vibration of non-homogeneous visco-elastic circular plate of linearly varying thickness in steady state temperature field
Drgania niejednorodnej lepko-sprężystej płyty kołowej o liniowo zmiennej grubości i ustalonym polu temperatury
Autorzy:: Gupta, A. K.
Kumar, L.
Powiązania:: https://bibliotekanauki.pl/articles/280105.pdf
Data publikacji:: 2010
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: non-homogeneous
visco-elastic
variable thickness
steady state temperature field
Opis:: An analysis is presented for free vibration of a non-homogeneous visco-elastic circular plate with linearly varying thickness in the radial direction subjected to a linear temperature distribution in that direction. The governing differential equation of motion for free vibration is obtained by the method of separation of variables. Rayleigh-Ritz's method has been applied. Deflection, time period and logarithmic decrement corresponding to the first two modes of vibrations of a clamped non-homogeneous visco-elastic circular plate for various values of non-homogeneity parameter, taper constant and thermal gradients are obtained and shown graphically for the Voigt-Kelvin model.
W pracy przedstawiono analizę drgań swobodnych niejednorodnej lepko- sprężystej płyty kołowej o liniowo zmiennej grubości w kierunku promieniowym i poddanej polu temperatury o liniowym rozkładzie w tym kierunku. Konstytutywne równanie różniczkowe ruchu dla drgań swobodnych otrzymano poprzez separację zmiennych. Zastosowano metodę Rayleigha-Ritza. W wyniku analizy wyznaczono ugięcie płyty, okres drgań i logarytmiczny dekrement tłumienia dwóch pierwszych postaci drgań dla warunków brzegowych odpowiadających zamocowaniu niejednorodnej płyty na brzegu. Wyniki przedstawiono graficznie w funkcji parametru niejednorodności, stałej zawężania grubości oraz zmiennego gradientu temperatury przy wykorzystaniu modelu reologicznego Kelvina-Voigta opisującego właściwości materiału płyty.
Źródło:: Journal of Theoretical and Applied Mechanics; 2010, 48, 1; 255-266
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Investigation of boundary condition effects on the stability of FGP beams in thermal environment
Autorzy:: Nasirzadeh, R.
Behjat, B.
Kharazi, M.
Khabazaghdam, A.
Powiązania:: https://bibliotekanauki.pl/articles/281316.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: FGP beam
stability
instability
buckling load
Timoshenko beam theory
non-homogeneous
homogeneous boundary conditions
Opis:: In this paper, stability and instability of Functionally Graded Piezoelectric (FGP) beams is investigated based on the Timoshenko beam theory. The material properties of the beam are considered to change gradually through thickness of the beam by a simple power law. By using the principle of minimum total potential energy, governing equations of the beam are derived. Stability behavior of the beam is predicted by solving the governing equations of the FGP beam. The results show that the homogeneity of boundary conditions plays a critical role in the stability of the FGP beam. While non-homogeneous boundary conditions lead to stable behavior of the FGP beam; homogeneous boundary conditions cause instability in the beam. By solving the eigenvalue equation of the FGP beam, the buckling load of the beam is obtained for the beams that have unstable behavior. Finally, the effects of various parameters on the buckling load of the unstable beam, such as power law index, temperature, applied voltage and aspect ratio are investigated, and the results are compared with the Euler-Bernoulli beam theory.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 1003-1014
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Generalized thermoelastic functionally graded half space under surface absorption of laser radiation
Autorzy:: Allam, M. N. M.
Tayel, I. M.
Powiązania:: https://bibliotekanauki.pl/articles/279539.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: laser pulse
generalized thermoelasticity
non-homogeneous medium
numerical inverse of Laplace transform
Opis:: The subject of this paper is to study the thermoelastic behavior of a functionally graded semi-infinite medium heated uniformly by a laser beam having temporally Gaussian distribution. The surface of the medium is taken as traction free. The general solution is obtained in the Laplace transform domain. The inverse of the Laplace transform is computed numerically using the Riemann-sum approximation method. The numerical results for temperature, displacement and stress are obtained and presented graphically for the generalized theory of thermo-elasticity with one relaxation time.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 155-165
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The Energy Method for Elastic Problems With Non-Homogeneous Boundary Conditions
Autorzy:: Quintanilla, R.
Powiązania:: https://bibliotekanauki.pl/articles/907887.pdf
Data publikacji:: 2002
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: matematyka
weighted energy method
decay estimates
Navier equations
non-homogeneous boundary conditions
Opis:: In this paper we propose the weighted energy method as a way to study estimates of solutions of boundary-value problems with non-homogeneous boundary conditions in elasticity. First, we use this method to study spatial decay estimates in two-dimensional elasticity when we consider non-homogeneous boundary conditions on the boundary. Some comments in the case of harmonic vibrations are considered as well. We also extend the arguments to a class of three-dimensional problems in a cylinder. A section is devoted to the study of an ill-posed problem. Some remarks are presented in the last section of the paper.In this paper we propose the weighted energy method as a way to study estimates of solutions of boundary-value problems with non-homogeneous boundary conditions in elasticity. First, we use this method to study spatial decay estimates in two-dimensional elasticity when we consider non-homogeneous boundary conditions on the boundary. Some comments in the case of harmonic vibrations are considered as well. We also extend the arguments to a class of three-dimensional problems in a cylinder. A section is devoted to the study of an ill-posed problem. Some remarks are presented in the last section of the paper.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2002, 12, 1; 91-100
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: M/M/n/(m,V) queueing systems with a rejection mechanism based on AQM
Autorzy:: Ziółkowski, M.
Małek, J.
Powiązania:: https://bibliotekanauki.pl/articles/122605.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: Markovian process
queueing systems with non-homogeneous customers
active queue management introduction
Opis:: M/M/n/(m,V) queueing systems with service time independent of customer volume are well known models used in computer science. In real computer systems (computer networks etc.) we often deal with the overload problem. In computer networks we solve the problem using AQM techniques, which are connected with introducing some accepting function that lets us reject in random way some part of the arriving customers. It causes reduction of each customer's mean waiting time and let us avoid jams in consequence. Unfortunately, in this way the loss probability increases. In this paper we investigate the analogous model based on some generalization of M/M/n/(m,V) queueing system. We obtain formulas for a stationary number of customers distribution function and loss probability and we do some computations in special cases.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 1; 121-130
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: An Investigation of the MIMO Space Time Block Code Based Selective Decode and Forward Relaying Network over η–µ Fading Channel Conditions
Autorzy:: Shankar, Ravi
Raman, V. V. Raghava
Rane, Kantilal Pitamber
Sarojini, B. K.
Neware, Rahul
Powiązania:: https://bibliotekanauki.pl/articles/2058506.pdf
Data publikacji:: 2022
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: 5G
MIMO
MRC
non-homogeneous fading channel
PEP
S-DF
SNR
Opis:: In this paper, we examine the end-to-end average pairwise error probability (PEP) and output probability (OP) performance of the maximum ratio combining (MRC) based selective decode and forward (S-DF) system over an η–µ scattering environment considering additive white Gaussian noise (AWGN). The probability distribution function (PDF) and cumulative distribution function (CDF) expressions have been derived for the received signal-to-noise (SNR) ratio and the moment generating function (MGF) technique is used to derive the novel closed-form (CF) average PEP and OP expressions. The analytical results have been further simplified and are presented in terms of the Lauricella function for coherent complex modulation schemes. The asymptotic PEP expressions are also derived in terms of the Lauricella function, and a convex optimization (CO) framework has been developed for obtaining optimal power allocation (OPA) factors. Through simulations, it is also proven that, depending on the number of multi-path clusters and the modulation scheme used, the optimized power allocation system was essentially independent of the power relation scattered waves from the source node (SN) to the destination node (DN). The graphs show that asymptotic and accurate formulations are closely matched for moderate and high SNR regimes. PEP performance significantly improves with an increase in the value of η for a fixed value of µ. The analytical and simulation curves are in close agreement for medium-to-high SNR values.
Źródło:: Journal of Telecommunications and Information Technology; 2022, 1; 79--92
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Propagation of torsional surface waves in a nonhomogeneous half-space with circular irregularity in free surface
Autorzy:: Sethi, M.
Sharma, A. K.
Sharma, A.
Powiązania:: https://bibliotekanauki.pl/articles/266151.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: propagacja fal
dyspersja
prędkość fali
non-homogeneous media
torsional waves
rigidity
irregularity
Opis:: The present paper studies the effect of circular regularity on propagation of torsional surface waves in an elastic non-homogeneous half-space. Both rigidity and density of the half-space are assumed to vary inversely linearly with depth. Separation of variable method has been used to get the analytical solutions for the dispersion equation of the torsional surface waves. Also, the effects of non-homogeneity and irregularity on the phase velocity of torsional surface waves have shown graphically.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 929-939
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Mathematical modeling of torsional surface wave propagation in a non-homogeneous transverse isotropic elastic solid semi-infinite medium under a layer
Autorzy:: Sethi, M.
Sharma, A.
Vasishth, A.
Powiązania:: https://bibliotekanauki.pl/articles/265089.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: non-homogeneous media
torsional surface waves
rigidity
fala powierzchniowa
propagacja fal
modelowanie matematyczne
Opis:: The present paper deals with the mathematical modeling of the propagation of torsional surface waves in a non-homogeneous transverse isotropic elastic half-space under a rigid layer. Both rigidities and density of the half-space are assumed to vary inversely linearly with depth. Separation of variable method has been used to get the analytical solutions for the dispersion equation of the torsional surface waves. Also, the effects of nonhomogeneities on the phase velocity of torsional surface waves have been shown graphically. Also, dispersion equations have been derived for some particular cases, which are in complete agreement with some classical results.
Źródło:: International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 415-426
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Earthquake analysis of arch dams including the effects of foundation discontinuities and proper boundary conditions
Autorzy:: Ferdousi, A.
Mostafa Gharabaghi, A. R.
Ahmadi, M. T.
Chenaghlou, M. R.
Emami Tabrizi, M.
Powiązania:: https://bibliotekanauki.pl/articles/279306.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: concrete arch dam
non-homogeneous and discontinuous rock foundation
nonlinear dynamic analysis
boundary conditions
Opis:: The interaction between dam foundation and rocks plays a significant role in the design and analysis of concrete arch dams. In the current study, comprehensive dynamic analysis of the dam-reservoir-foundation system is performed by developing a non-linear finite element program. The objective of this paper is to study the seismic behavior of a concrete arch dam taking into account the effects of foundation discontinuities and foundation inhomogeneity on the stability. Proper modeling truncated boundary conditions at the far-end of the foundation and reservoir fluid domain as well as to correctly apply the in-situ stresses for the foundation rock represents field conditions in the model more realistically. In this paper, the nonlinear seismic response of the dam-reservoir-foundation system includes dam-canyon interaction, dam body contraction joint opening, discontinuities (possible sliding planes) of the foundation rock and the failure of the joined rock and concrete materials. The results for the Karun 4 dam as a case study revealed the substantial effect of modeling discontinuities and boundary conditions of the rock foundation under seismic excitation that needs to be considered in the design of new dams and can be applied to seismic safety evaluation of the existing dams.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 579-594
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Application of PIES and rectangular Bezier surfaces to complex and non-homogeneous problems of elasticity with body forces
Autorzy:: Boltuc, A.
Zieniuk, E.
Powiązania:: https://bibliotekanauki.pl/articles/1955310.pdf
Data publikacji:: 2010
Wydawca:: Politechnika Gdańska
Tematy:: boundary problems
elasticity
body forces
non-homogeneous materials
Bezier surfaces
parametric integral equation system (PIES)
Opis:: This paper presents a variety of applications of an effective way to solve boundary value problems of 2D elasticity with body forces. An overview of the approach is presented, its numerical implementation, as well as a number of applications, ranging from problems defined on elementary shapes to complex problems, e.g. with non-homogeneous material. The results obtained by the parametric integral equation system (PIES) were compared with the analytical and numerical solutions obtained by other computer methods, confirming the effectiveness of the method and its applicability to a variety of problems.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 4; 363-376
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Metoda dyskretyzacji częściowej w analizie drgań własnych niejednorodnych płyt kołowych z wtrąceniami w postaci masy pierścieniowej
The method of partial discretization in free vibration analysis of non-homogeneous circular plates with additional annular mass
Autorzy:: Żur, K. K.
Jaroszewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/209463.pdf
Data publikacji:: 2013
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: drgania własne
płyta kołowa
niejednorodność
masa pierścieniowa
free vibrations
circular plate
non-homogeneous
annular mass
Opis:: W pracy wykorzystano funkcję wpływu i metodę dyskretyzacji częściowej do analizy drgań własnych trojwarstwowej płyty kołowej typu ,,sandwich”, o stałej grubości i utwierdzonej na obwodzie. Wyznaczono sztywność zastępczą płyty oraz dokonano dyskretyzacji jej masy uwzględniając niejednorodność materiału. Konstruując macierz wpływu oraz wykorzystując wzory Bernsteina-Kieropiana, obliczono dokładne i przybliżone estymatory częstości drgań własnych płyty. W pracy zbadano wpływ pierścieniowej masy skupionej i symetrycznej niejednorodności materiału płyty na jej częstości drgań własnych.
In the paper, influence function and method of partial discretization in free vibration analysis of non-homogeneous circular plate with constant thickness and clamped edges were presented. Discretization of mass of circular plate and calculation of replacing stiffness were achieved. Influence matrix and Bernstein-Kieropian’s estimators were calculated. The influence of additional annular mass and non-homogeneous material on a value of natural basic frequency of a sandwich circular plate was also presented.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2013, 62, 3; 145-156
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Lifter, a Computerized Lifting Analysis Technique
Autorzy:: Gilad, I.
Boughanim, D.
Powiązania:: https://bibliotekanauki.pl/articles/91160.pdf
Data publikacji:: 2002
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: non-homogeneous loads
lifting model
weight distribution
praca ciężka
fizjologia pracy
pozycja przy pracy
podnoszenie ładunku
Opis:: A computer driven technique to analyze lifting forces, in non-homogeneous load situations, is described and tested. Analysis is based on a dynamic algorithm aimed to evaluate unconstrained lifting posture and non-homogeneous content of loads. For inputs we use actual geometrical body postures in the form of 3-dimensional co-ordinates obtained from pictures taken at a work site. The outputs show a good match between the findings and pre-study assumptions for balanced and non-balanced load lifting practice. The results of the experiments show a good degree of correlation with results reported by researchers for symmetrical lifting tasks and with National Institute for Occupational Health (NIOSH) lifting guidelines. It is believed that the technique can serve as the proper choice for industrial and safety analysts of lifting activities.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2002, 8, 4; 525-537
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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