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Wyświetlanie 1-15 z 167
Tytuł:
Ice with a non-conventional cooling system temperature mapping
Autorzy:
Hlavňa, V.
Sojčak, D.
Istenik, R.
Powiązania:
https://bibliotekanauki.pl/articles/243209.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-conventional cooling system
combustion engine
non-conventional energetic system
thermal balance
Opis:
Within the framework of the basic research task funded by the Agency for support of research and development we solve a problem of a more effective non-conventional usage of the part of energy taken away by the ICE cooling system. The energy is used for production of cold. Results ofpartial solutions and methodology of energetic evaluation have been already presented in various conferences and symposia as well as published in several professional journals. This contribution brings some newly acquired theoretical and practical experience gathered during the operation of a test laboratory sample of the cooling engine in a non-conventional energetic unit. Experiments were focused on temperature mapping. The basic scheme of a non-conventional energetic unit with a cooling engine, the view of a functional laboratory sample, surface temperature in the vicinity of evaporator - taken by thermal imaging, time course of changes in the engine torque, revolutions and temperature on the engine, temperatures in the evaporator, temperatures in the liquefier, temperatures in the absorber, temperatures in the evaporator, temperatures in the VBR exchanger are presented in the paper. The results of the experiment shown that there is a 10 - 15 % agreement with the results acquired through calculations. Theoretical assumptions and solutions carried out for the alternative cooling liquid of the cooling engine in a non-conventional energetic unit can be considered real. Within the framework of this consideration a test circuit is being prepared for experiments with alternative cooler.
Źródło:
Journal of KONES; 2007, 14, 2; 187-193
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Descriptor standard and positive discrete-time nonlinear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/229855.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
descriptor
Weierstrass-Kronecker decomposition
non-linear system
positivity
Opis:
A method of analysis of descriptor nonlinear discrete-time systems with regular pencils of linear part is proposed. The method is based on the Weierstrass-Kronecker decomposition of the pencils. Necessary and sufficient conditions for the positivity of the nonlinear systems are established. A procedure for computing the solution to the equations describing the nonlinear systems are proposed and demonstrated on numerical examples.
Źródło:
Archives of Control Sciences; 2015, 25, 2; 227-235
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three Simultaneous Superimposed Rotating System
Autorzy:
Das, M. CH.
Misra, R.
Powiązania:
https://bibliotekanauki.pl/articles/412349.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
non-inertial system
coordinate transformation
space-time geometry
Opis:
In inertial system, co-ordinate transformation from one frame to another is possible by using Lorentz transformation matrix. But in non-inertial or rotating system it is not applicable by using Lorentz transformation matrix. In this paper, co-ordinate transformation from one frame to another in three simultaneous superimposed rotating systems has been introduced. This also leads to assume a picture of space-time geometry of same system.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 8, 3; 215-219
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas hold-up analysis in an unsteady stirred vessel by means of infinite series
Autorzy:
Frankiewicz, Sebastian S.
Woziwodzki, Szymon
Powiązania:
https://bibliotekanauki.pl/articles/27315623.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
unsteady mixing
gas hold-up
non-coalescing system
stirred vessel
Opis:
The use of a liquid level sensor made it possible to measure changes in gas hold-up over time in a stirred tank during unsteady mixing. These results were subjected to Fourier time series analysis and a model of gas hold-up changes in time was proposed. It allowed one to determine the model value of gas hold-up, which can be useful for characterizing gas hold-up during unsteady mixing and as a comparison to gas hold-up during steady mixing. The characteristic frequency was also determined, which corresponds to about twice the oscillation frequency. Model gas hold-up values for coalescing and non-coalescing systems were compared. Moreover, the change of the gas hold-up at constant maximum stirrer rotation frequency and variable gas flow rate for different oscillation frequencies was investigated.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 2; 30--35
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RC-ladder networks with supercapacitors
Autorzy:
Mitkowski, W.
Bauer, W.
Zagórowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/141653.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
supercapacitors
RC ladder network
non-integer order system
Opis:
Nowadays, non-integer systems are a widely researched problem. One of the questions that is of great importance, is the use of mathematical theory of a non-integer order system to the description of supercapacitors (capacitors with very high capacitance). In the description of electronic systems built on a microscale, there are models with distributed parameters of fractional derivatives, which can be successfully approximated by finite-dimensional structures, e.g, in the form of various types of ladder systems (chain). In this paper, we will analyze a ladder system of an RC type consisting of supercapacitors.
Źródło:
Archives of Electrical Engineering; 2018, 67, 2; 377--389
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the analytical solution for the slewing flexible beam-like system: analysis of the linear part of the perturbed problem
O analitycznym rozwiązaniu dla układu podatnej belki obrotowej: analiza części liniowej zagadnienia perturbowanego
Autorzy:
Fenili, A.
Balthazar, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/281759.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nieidealne systemy
struktury elastyczne
non-ideal system
flexible structure
perturbed equations
Opis:
The dynamical system investigated in this work is a nonlinear flexible beam-like structure in slewing motion. Non-dimensional and perturbed governing equations of motion are presented. The analytical solution for the linear part of these perturbed equations for ideal and for non-ideal cases are obtained. This solution is necessary for the investigation of the complete weak nonlinear problem where all nonlinearities are small perturbations around a linear known solution. This investigation shall help the analyst in the modelling of dynamical systems with structure-actuator interactions.
Układem dynamicznym badanym w pracy jest podzespół zawierający podatną belkę poruszającą się ruchem obrotowym w płaszczyźnie poziomej. Zaprezentowano bezwymiarowe i perturbowane równania ruchu. Rozwiązania analityczne części zlinearyzowanej tych równań uzyskano dla przypadku idealnego i nieidealnego. Taka postać rozwiązania jest niezbędna do analizy zupełnego i słabo nieliniowego problemu, w którym nieliniowości stanowią niewielkie perturbacje wokół rozwiązania liniowego. Prezentowane wyniki badań mogą okazać się pomocą dla analityków zajmujących się modelowaniem układów dynamicznych uwzględniających interakcje zachodzące pomiędzy daną konstrukcją bazową, a zamocowanymi na niej aktywnymi elementami wykonawczymi (aktuatorami).
Źródło:
Journal of Theoretical and Applied Mechanics; 2008, 46, 1; 51-68
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the dynamics of singular protected systems
Autorzy:
Naumeyko, I.
Alja'afreh, M.
Powiązania:
https://bibliotekanauki.pl/articles/411040.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
"Man-Machine-Environment" model
non-linear system
singular equations
asymptotic
linearization
Opis:
The analysis of asymptotic representations of the systems protected from harmful influences is carried out. Various types of general models of the "manmachineenvironment" with protection are considered. Each of them adequately describes some of the practically important qualities of the object, and they all together describe the object in terms of its safe operation. The dynamic properties of complex ergonomic systems, presented in the form of systems of differential equations with a small parameter at the derivative are investigated The methods of reducing the impact on the person of harmful factors are theoretically substantiated. The dynamic protection response speed is considered to be significantly greater than the harmful factor production rate. Numerical solution of the general problem and the analytical solution for autonomous case is obtained for harmful effects. By using asymptotic the system of equations has been solved in closed form not only for autonomous case, but also for parameters smoothly changing in time. The estimates of the cost of protection was obtained for the various cost-functionals and for different functions in the right-hand side of the equation describing the dynamics of protection. To assess the accuracy of model calculations and for graphic representation of the results mathematical package MAXIMA is used.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 4; 37-42
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic balance research of protected systems
Autorzy:
Naumeyko, I.
Alja'afreh, M.
Powiązania:
https://bibliotekanauki.pl/articles/411213.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
Non-linear system
singular points
eigenvalues
asymptotic behavior
first approximation
linearization
Opis:
The dynamic models of the complex ergatic objects' behavior, presented in the form of differentia equations and their systems were studied. The stability and other properties are researched. The methods of analysis and reduce of harmful factors and their impact on people were theoretically proved. The methods of analysis and critical points removal in dynamic models of hazards distribution are offered. The object of study is the system of the harmful external factors protection. Subject of research is the system of two nonlinear differential equations as a model of technical systems with protection. The object of protection is described by logistic equation. and defense system - by non-linear differential equation with a security functions of rather general form. This paper describes critical modes analysis and stationary states’ stability of protected systems with harmful influences. Numerical solution of general problem and also the analytical solution for the case of fixed expected harmful effects have been obtained. Various types of general models for "Man-machine-environment" systems were studied. Each of describes some kind of the practically important quality of object in an appropriate way. And All together they describe the object in terms of it’s safe operation. Their further detailing process results to either well-known, or some new subsystems’ models. Systems with "fast" protection at a relatively slow dynamics of the object were studied. This leads to the models with small parameter and asymptotic solutions of differentia equations. Some estimates for protection cost in different price-functional and for different functions in the right part of equation, which describes the dynamics of defense were obtained. For calculations, analysis and graphical representations some of mathematical packages was applied.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 3; 85-90
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On dynamically consistent Jacobian inverse for non-holonomic robotic systems
Autorzy:
Ratajczak, J.
Tchoń, K.
Powiązania:
https://bibliotekanauki.pl/articles/229326.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-holonomic system
motion
Jacobian inverse
dynamic consistency
metric
motion planning
Opis:
This paper presents the dynamically consistent Jacobian inverse for non-holonomic robotic system, and its application to solving the motion planning problem. The system’s kinematics are represented by a driftless control system, and defined in terms of its input-output map in accordance with the endogenous configuration space approach. The dynamically consistent Jacobian inverse (DCJI) has been introduced by means of a Riemannian metric in the endogenous configuration space, exploiting the reduced inertia matrix of the system’s dynamics. The consistency condition is formulated as the commutativity property of a diagram of maps. Singular configurations of DCJI are studied, and shown to coincide with the kinematic singularities. A parametric form of DCJI is derived, and used for solving example motion planning problems for the trident snake mobile robot. Some advantages in performance of DCJI in comparison to the Jacobian pseudoinverse are discovered.
Źródło:
Archives of Control Sciences; 2017, 27, 4; 555-573
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Magnetic Water Treatment Mechanism
Autorzy:
Vaskina, Iryna
Roi, Ihor
Plyatsuk, Leonid
Vaskin, Roman
Yakhnenko, Olena
Powiązania:
https://bibliotekanauki.pl/articles/123611.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wastewater
aqueous solutions
water isomer
magnetic induction
non-equilibrium system
librational fluctuation
Opis:
The main problem of widespread introduction of magnetic water treatment (MWT) in the processes of water and wastewater treatment is the lack of modern research aimed at studying the mechanisms of MWT effects, in particular the influence on the physicochemical properties of aqueous solutions. This study explains the effect of MWT taking into account the physical and chemical properties of aqueous solutions due to the presence of the quantum differences in water molecules. All of the MWT effects are related to the change in the physicochemical properties of aqueous solutions. It is due to the presence of two types of water molecule isomers and their librational oscillations. The result of MWT is a violation of the synchronism of para-isomers vibrations, with the subsequent destruction of ice-like structures due to the receiving of energy from collisions with other water molecules (ortho-isomers). One of the most important MWT effects includes the change in the nature and speed of the physicochemical processes in aqueous solutions by increasing the number of more physically and chemically active ortho-isomers. The MWT parameters specified in the work allow explaining the nature of most MWT effects and require developing the scientific and methodological principles for the implementation of the MWT process and mathematical modeling of the MWT process in the water and wastewater treatment. It can be used in the design of the MWT devices taking into account the constructive and mode parameters of MWT devices.
Źródło:
Journal of Ecological Engineering; 2020, 21, 2; 251-260
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura systemu pomiarowego niekonwencjonalnego obwodu energetycznego
A structure of the measurement system for a non-conventional energetic circuit
Autorzy:
Hlavňa, V.
Powiązania:
https://bibliotekanauki.pl/articles/301417.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
niekonwencjonalny system energetyczny
system pomiarowy
niekonwencjonalny silnik spalinowy
non-conventional energetic system
measurement system
non-conventional combustion engine
Opis:
W artykule omówiono automatyczny systemu pomiarowy, który zastosowano w niekonwencjonalnym obwodzie energetycznym. Podstawą niekonwencjonalnego obwodu energetycznego jest układ trójzmienny, w którym silnik spalinowy o zapłonie samoczynnym jest podstawowym źródłem energii. System ten produkuje energię elektryczną i energie ciepłą na trzech poziomych termicznych. Opisany system jest niekonwencjonalny ponieważ zastosowano niekonwencjonalny obwód chłodzenia silnika spalinowego, który zaprojektowano jako termokompresor dla absorpcji ciepła z tego obwodu.
The paper deals with an automated measuring system implemented in a non-conventional energetic circuit. The basis of a non-conventional energetic circuit is a trivalent system in which the ignition combustion engine is the source of primary energy. The system produces electric and thermal energy at three thermal levels. The system is referred to as non-conventional because of the non-conventional cooling circuit of the combustion engine which has been designed as a thermo compressor for absorptive cooling circulation.
Źródło:
Eksploatacja i Niezawodność; 2009, 1; 11-14
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of pre-stress on stability and vibration of geometric nonlinear column at a load force directed to the positive pole
Autorzy:
Szmidla, J.
Cieślińska-Gąsior, I.
Powiązania:
https://bibliotekanauki.pl/articles/127836.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
free vibrations
geometrically non-linear system
prestressing
drgania swobodne
układ geometrycznie nieliniowy
sprężanie
Opis:
The subject of the results of theoretical and numerical studies measures to designate the effect of pre-stress on the vibration of geometrically non-linear column exposed to the load force directed to the positive pole. Considering the total mechanical energy of the system the equation of motion and the boundary conditions necessary to solve the boundary problem were determined. Based on the kinetic stability criterion the range of values of internal compression forces was determined in which the growth of critical load of the column above the local loss of stability was achieved. In the research the geometrically non-linear system was analysed with variable asymmetry of bending stiffness and at selected values of geometrical parameters of the head realizing the load.
Źródło:
Vibrations in Physical Systems; 2014, 26; 289-296
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie przepięć atmosferycznych jako źródeł zakłóceń w układach zasileniach odbiorów nieatrakcyjnych
Modeling atmospheric power surges as sources of discruptions in non-traction power system
Autorzy:
Wróbel, Z.
Ziemba, R.
Powiązania:
https://bibliotekanauki.pl/articles/249746.pdf
Data publikacji:
2008
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
odbiór nietrakcyjny
przepięcie atmosferyczne
non-traction power system
power surge
Opis:
Podczas występowania bezpośredniego udaru piorunowego w układach zasilających odbiory potrzeb nietrakcyjnych zagrożenie uszkodzenia urządzeń może występować niemal przy każdym wyładowaniu, nawet dość odległym. Skutkiem tego na przepięcia o dużych amplitudach narażone są elementy układów zasilania linii potrzeb nietrakcyjnych i połączone z nimi urządzenia sterowania ruchem kolejowym (srk). Możliwe jest występowanie w układach zasilających zakłóceń o wielkościach porównywalnych z sygnałami użytecznymi wywoływanych wyładowaniami atmosferycznymi lub będących wynikiem zadziałania zdalnych impulsów elektromagnetycznych.
Źródło:
TTS Technika Transportu Szynowego; 2008, 12; 41-44
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stationary Action Principle for Vehicle System with Damping
Autorzy:
Kosiński, W.
Oliferuk, W.
Powiązania:
https://bibliotekanauki.pl/articles/386816.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
formalizm Lagrange'a
tłumienie
non-conservative system
principle of stationary action
Lagrangian formulation
non-commutative rule
damping
Opis:
The aim of this note is to show possible consequences of the principle of stationary action formulated for nonconservative sys tems. As an example, linear models of vibratory system with damping and with one and two degrees of freedom are considered. This kind of models are frequently used to describe road and rail vehicles. There are vibrations induced by road profile. The appropriate action functional is proposed with the Lagrangian density containing: the kinetic and potential energies as well as dissipative one. Possible variations of generalized coordinates are introduced together with a noncommutative rule between operations of taking variations of the coordinates and their time derivatives. The stationarity of the action functional leads to the EulerLagrange equations.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 4; 23-26
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-analytical treatment of complex nonlinear oscillations arising in the slider-crank mechanism
Autorzy:
Big-Alabo, Akuro
Ogbodo, Collins Onyinyechukwu
Ossia, Chinwuba Victor
Powiązania:
https://bibliotekanauki.pl/articles/1031444.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Slider-crank mechanism
conservative system
continuous piecewise linearization method
non-natural system
nonlinear oscillation
periodic solution
Opis:
The model for the free nonlinear oscillation of the slider-crank mechanism is very complicated and difficult to solve accurately using most of the existing approximate analytical schemes. However, the continuous piecewise linearization method (CPLM), which is a recently proposed semi-analytical algorithm, is capable of producing simple and accurate periodic solutions for conservative systems irrespective of the complexity of the nonlinear restoring force. Hence, this study applied the CPLM to solve and analyze the complex nonlinear oscillations arising in the slider-crank mechanism. The CPLM results were verified using numerical solutions and it was found that the CPLM solution was accurate to less than 1.0% for angular amplitudes up to 165°. Analysis of the frequency-amplitude response revealed the existence of asymptotic behaviour as the ratio of the crank radius to the connecting rod length approaches zero or unity. Hence, oscillation models for the observed asymptotic responses were derived and found to be significantly simpler compared to the original oscillation model. Finally, analysis of the large-amplitude oscillations of the slider-crank mechanism revealed the presence of strong anharmonic response.
Źródło:
World Scientific News; 2020, 142; 1-24
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 167

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