Temat: random parameter - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Time-independent stochastic design sensitivity analysis of structural systems with second-order accuracy
Autorzy:: Weber, H.
Powiązania:: https://bibliotekanauki.pl/articles/281017.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: design sensitivity
statics
random parameter
finite element
Opis:: In the paper, the static sensitivity of complex structures with respect to random design parameters is presented. Using the adjoint system method, based on the mean-point second-order perturbation method, the first two probabilistic moments of time-independent sensitivity are formulated with means and cross-covariances of random design parameters as the input data. It enables one to obtain the second-order accuracy of the solution. The presented formulations are illustrated by a number of numerical examples. The influence of finite element mesh density for the obtained results is discussed using the analysis of the spatial bar dome.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 783-794
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of uncertainty in aerodynamic performance on the dynamic response of a two stage gear system
Autorzy:: Tounsi, M.
Beyaoui, M.
Abboudi, K.
Feki, N.
Walha, L.
Haddar, M.
Powiązania:: https://bibliotekanauki.pl/articles/281135.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: gearbox
uncertainty
power coefficient
random parameter
polynomial chaos
Opis:: In this paper, the nonlinear dynamic response in a wind turbine system is considered and the quantification of uncertainty effects on the variability of this nonlinear response is investigated. Under dynamic conditions, a lumped model with 12 degrees of freedom is proposed taking into account the uncertainty associated to the power coefficient of the input aerodynamic torque. The dynamic response of the two-stage spur gear system is obtained using ODE45 solver of Matlab. The Polynomial Chaos (PC) method is used to introduce the uncertainties on the proposed model. A comparison between the two dynamic responses given by the proposed lumped dynamic model takes into account the uncertainty. It is performed on the existed model without uncertainty. Thus, the efficiency and robustness of the proposed new methodology is evaluated.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 601-612
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Heavy vehicle crashes in Addis Ababa: Relationship between contributing factors and severity of outcomes
Autorzy:: Tulu, Getu Segni
Lisinge, Robert Tama
Wedajo, Bikila Teklu
Powiązania:: https://bibliotekanauki.pl/articles/2176020.pdf
Data publikacji:: 2022
Wydawca:: Fundacja Centrum Badań Socjologicznych
Tematy:: heavy vehicle
crashes
road safety
random parameter logit regression
risk
Ethiopia
Addis Ababa
Opis:: Random parameter logit regression is used to analyze police-reported data on 8,253 heavy vehicle-related crashes in Addis Ababa between July 2014 and June 2017. The analysis shows that fatal crashes are more likely to occur during the day and on weekdays, particularly when the circulation of trucks is high. It also shows the disproportionately high involvement of young drivers in heavy vehicle crashes in the city. However, the likelihood of crashes resulting in fatalities and serious injuries increases slightly compared to those resulting only in property damage as the age of drivers increases. Low levels of drivers' education, the fact that drivers are often not the owners of vehicles, ownership of vehicles by companies and government organizations, and inappropriate road medians' inappropriate design are also significant contributors to fatal crashes. Curbing deaths and injuries from heavy vehicle crashes in Addis Ababa requires strict enforcement of traffic rules and regulations, particularly speed limits; reforms in driver's training and certification; improved safety culture of vehicle owners and design of road infrastructure. Ethiopia's national road safety strategy launched in July 2022 addresses these issues. Hence the government is taking steps in the right direction.
Źródło:: Journal of Sustainable Development of Transport and Logistics; 2022, 7, 2; 25--40
2520-2979
Pojawia się w:: Journal of Sustainable Development of Transport and Logistics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Opredelenie korreljacionnojj svjazi mezhdu otdel'nymi geometricheskimi parametrami zeren razlichnykh kul'tur
Determination of correlation relationship between individual geometrical parameters of grains of different cultures
Autorzy:: Kuzminskijj, R.
Sokolovskijj, O.
Sheremeta, R.
Powiązania:: https://bibliotekanauki.pl/articles/77786.pdf
Data publikacji:: 2015
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:: grain crop
wheat
rye
geometrical parameter
random variable
correlation analysis
Źródło:: Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
1730-8658
Pojawia się w:: Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: On a strongly consistent estimator of the squared L_2-norm of a function
Autorzy:: Różański, Roman
Powiązania:: https://bibliotekanauki.pl/articles/1340253.pdf
Data publikacji:: 1995
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: strong consistency
stochastic integral with respect to a p-parameter martingale
Poisson random field
Wiener random field
asymptotic unbiasedness
kernel estimator
Opis:: A kernel estimator of the squared $L_2$-norm of the intensity function of a Poisson random field is defined. It is proved that the estimator is asymptotically unbiased and strongly consistent. The problem of estimating the squared $L_2$-norm of a function disturbed by a Wiener random field is also considered.
Źródło:: Applicationes Mathematicae; 1995-1996, 23, 3; 279-284
1233-7234
Pojawia się w:: Applicationes Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Set-valued stochastic integrals and stochastic inclusions in a plane
Autorzy:: Sosulski, Władysław
Powiązania:: https://bibliotekanauki.pl/articles/729310.pdf
Data publikacji:: 2001
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: stochastic inclusions in the plane
set-valued random field
two-parameter stochastic process
weak compactness
Opis:: We present the concepts of set-valued stochastic integrals in a plane and prove the existence of a solution to stochastic integral inclusions of the form
$z_{s,t} ∈ φ_{s,t} + ∫_{0}^{s} ∫_{0}^{t} F_{u,v}(z_{u,v})dudv + ∫_{0}^{s} ∫_{0}^{t}G_{u,v}(z_{u,v})dw_{u,v}$
Źródło:: Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2001, 21, 2; 249-259
1509-9407
Pojawia się w:: Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Representation formulae for (C₀) m-parameter operator semigroups
Autorzy:: Zhou, Mi
Anastassiou, George
Powiązania:: https://bibliotekanauki.pl/articles/1311136.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: multi-parameter operator semigroups
representation formulae
multivariate approximation
sum of random vectors
Banach space
multiplier enlargement method
rate of convergence
second modulus of continuity
inequalities
Opis:: Some general representation formulae for (C₀) m-parameter operator semigroups with rates of convergence are obtained by the probabilistic approach and multiplier enlargement method. These cover all known representation formulae for (C₀) one- and m-parameter operator semigroups as special cases. When we consider special semigroups we recover well-known convergence theorems for multivariate approximation operators.
Źródło:: Annales Polonici Mathematici; 1996, 63, 3; 247-272
0066-2216
Pojawia się w:: Annales Polonici Mathematici
Dostawca treści:: Biblioteka Nauki

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