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    Wyświetlanie 1-14 z 14
    Tytuł:
    Reduction of Deformations during Welding Metal Wire Mesh with Frames
    Autorzy:
    Krawczyk, R.
    Słania, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356539.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    welding
    stresses
    deformations
    moment of inertia
    Opis:
    The article presents an issue referring to a reduction of deformation during welding metal wire mesh into the frames. A problem of a possible reduction of deformations was described taking into account characteristics of a construction of a welded element. Technological tests and their results are provided. Technological recommendations relating to the reduction of deformations of the welded element are given.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 529-534
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deflection of Steel Reinforced Concrete Beam Prestressed with CFRP Bar
    Autorzy:
    Selvachandran, P.
    Anandakumar, S.
    Muthuramu, K. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/353032.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cracked moment of inertia
    deformability
    effective moment of inertia
    neutral axis
    Partial Prestressig Ratio
    yielding point
    Opis:
    Carbon Fiber Reinforced polymer (CFRP) bars are weak in yielding property which results in sudden failure of structure at failure load. Inclusion of non-pretensioned steel reinforcement in the tension side of CFRP based prestressed concrete beam will balance the yielding requirements of member and it will show the definite crack failure pattern before failure. Experimental investigation has been carried out to study the deflection behavior of partially prestressed beam. Experimental works includes four beam specimens stressed by varying degree of prestressing. The Partial Prestressing Ratio (PPR) of specimen is considered for experimental works in the range of 0.6 to 0.8. A new deflection model is recommended in the present study considering the strain contribution of CFRP bar and steel reinforcement for the fully bonded member. New deflection model converges to experimental results with the error of less than 5% .
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1915-1922
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal dynamics of a building
    Autorzy:
    Matysko, R.
    Dyczkowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175263.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transient model
    thermal loss
    thermal inertia
    building
    Opis:
    The work presents the thermal dynamics of the building. The mathematical model covers the issues of heat exchange and temperature control in the room due to changing environmental conditions. The presented work describes the operation of the control system due to thermal losses and thermal inertia of the building. Mathematical model introduces a new method of thermal loss analysis in the conditions of variable thermal dynamics of the building.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2018, 141; 31-40
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capability of synchronous machines to ride through events with high ROCOF
    Autorzy:
    Assenkamp, Alf
    Kreischer, Christian
    Kulig, Stefan
    Powiązania:
    https://bibliotekanauki.pl/articles/140451.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ROCOF
    under-excitation protection
    turbo-generator
    low-inertia grids
    Opis:
    The transition of power grids to implement large amounts of nonsynchronous renewables reduces the inertia in the power system. Therefore, the rate of change of fre- quency (ROCOF) after a fault of given energy is higher in low inertia grids than in grids with mainly synchronous machines operating. Standard faults for the design of existing synchronous machines assume fixed frequency grids, in which an electrically close fault happens. It is not tested, if the machines can ride through transient disturbances with high ROCOF. For ROCOF values of up to 1 Hz/s as foreseen for the upcoming grid code of the Republic of Ireland and up to 2 Hz/s for Northern Ireland, a thorough verification, if generators are capable to ride through such events is necessary. For this study, ROCOF frequency traces provided by the transmission system operators (TSOs) of Ireland were first benchmarked with a full-grid model and in a second step impressed on a model of generators connected to the power grid via a step-up transformer to study transient stability and nonlinear response of the generator. This paper focusses on the ability of nine different synchronous machines to stay connected to the transmission system during severe ROCOF events without losing synchronism.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 2; 325-339
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual synchronous generator frequency response study of energy computing and storage devices
    Autorzy:
    Zhang, Baoge
    Ping, Shanyan
    Long, Yi
    Jiao, Yuemin
    Wu, Boxiang
    Powiązania:
    https://bibliotekanauki.pl/articles/2172798.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    damping coefficient
    energy storage capacit
    inertia coefficient
    virtual synchronous machine
    Opis:
    Renewable energy sources are connected to the grid through inverters, resulting in reduced grid inertia and poor stability. Traditional grid-connected inverters do not have the function of voltage and frequency regulation and can no longer adapt to the new development. The virtual synchronous generator (VSG) has the function of voltage and frequency regulation and has more outstanding advantages than the traditional inverter. Based on the principle of the VSG, the relationship between energy storage capacity, frequency response and output power of the VSG is derived, and the relationship between the virtual inertia coefficient, damping coefficient and frequency characteristics of the VSG and output power is revealed. The mathematical model is established and modeled using the Matlab/Simulink simulation software, and the simulation results verify the relationship between energy storage capacity and frequency response and the output power of the VSG.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 4; 895--907
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zjawisko uporczywości (inercyjności) inflacji w Polsce
    The Phenomenon of Inflation Persistence (Inertia) in Poland
    Явление инертности инфляции в Польше
    Autorzy:
    Misztal, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1033292.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inflation
    monetary policy
    inflation persistence (inertia)
    инфляция
    монетарная политика
    инертность инфляции
    Opis:
    The purpose of this study is to analyze the phenomenon of inflation persistence (inertia) in Poland. Inflation persistence is defined as a strong positive relationship between inflation in the current period and prior periods. This causes difficulties for monetary authorities to reduce inflation after its acceleration, and the necessary adjustments last longer and cause greater volatility in output and employment. The empirical analysis using the vector autoregression model (VAR) confirmed the presence in Poland of a relatively high inflation persistence in the period 1996-2012. The degree of inflation persistence was differentiated for individual groups of goods and services included in the harmonized index of consumer prices (HICP). The highest price inertia occurred in the case of alcoholic beverages and tobacco products as well as clothing and footwear, and the lowest one was observed in communication services.
    Целью статьи является анализ явления инертности инфляции в народном хозяйстве Польши. Инерция инфляции означает сильную положительную зависимость между инфляцией текущего периода и предыдущих периодов. Это вызывает трудности в торможении инфляции после периода её ускоренного роста, а необходимая адаптация занимает больше времени и вызывает большие колебания уровня производства и занятости. Эмпирический анализ, опирающийся на применение модели векторной авторегрессии – VAR, подтвердил наличие в Польше в период 1996–2012 гг. относительно высокой инертности инфляции. Степень инертности инфляции дифференцирована по отдельным группам товаров и услуг, учитываемых при расчёте общего индекса потребительских цен. Наибольшая инертность цен наблюдается в таких товарных группах, как алкогольные напитки и табачные изделия, а также одежда и обувь, а самая низкая – в сфере транспортных услуг.
    Źródło:
    Ekonomista; 2014, 3; 397-417
    0013-3205
    2299-6184
    Pojawia się w:
    Ekonomista
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of adaptive electric drive control system of horizontal looper
    Autorzy:
    Breido, Iosif
    Kuntush, Yelena
    Powiązania:
    https://bibliotekanauki.pl/articles/141026.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromechanical system
    horizontal looper
    synthesis of damping system
    variable inertia moment
    Opis:
    The article presents studies on the electromechanical system of a metallurgical horizontal looper in the steelmaking industry. During the operation of this unit, parameters in the system changes due to variations of length and mass of the steel strip, these variations significantly change elastic properties and reduce moments of inertia. Various methods of combating elastic vibrations in electromechanical systems are analyzed in this article. The article presents a description of experiments with a horizontal looper. A mathematical model for two extreme positions of the unit was developed based on experimental results. Simulation experiments were made and their results are presented. A new control system structure is proposed to reduce vibrations in the electromechanical system of a horizontal looper. A power-up sensor, adjuster and velocity derivative feedback were added into the model structure. The proposed feedback link structure takes into account the change of steel strip length. From the experimental data it follows that the proposed system provides effective damping of mechanical vibrations in the steel strip if its length during operation is changed.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 679-694
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient simulation of a squeeze film damped turbocharger rotor under consideration of fluid inertia and cavitation
    Autorzy:
    Drapatow, Thomas
    Alber, Oliver
    Woschke, Elmar
    Powiązania:
    https://bibliotekanauki.pl/articles/2090678.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotor dynamics
    journal bearings
    squeeze film damper
    fluid inertia
    dynamika wirnika
    łożysko ślizgowe
    bezwładność cieczy
    Opis:
    Squeeze film dampers (SFDs) are commonly used in turbomachinery in order to introduce external damping, thereby reducing rotor vibrations and acoustic emissions. Since SFDs are of similar geometry as hydrodynamic bearings, the REYNOLDS equation of lubrication can be utilised to predict their dynamic behaviour. However, under certain operating conditions, SFDs can experience significant fluid inertia effects, which are neglected in the usual REYNOLDS analysis. An algorithm for the prediction of these effects on the pressure build up inside a finite-length SFD is therefore presented. For this purpose, the REYNOLDS equation is extended with a first-order perturbation in the fluid velocities to account for the local and convective inertia terms of the NAVIER-STOKES equations. Cavitation is taken into account by means of a mass conserving two-phase model. The resulting equation is then discretized using the finite volume method and solved with an LU factorization. The developed algorithm is capable of calculating the pressure field, and thereby the damping force, inside an SFD for arbitrary operating points in a time-efficient manner. It is therefore suited for integration into transient simulations of turbo machinery without the need for bearing force coefficient maps, which are usually restricted to circular centralized orbits. The capabilities of the method are demonstrated on a transient run-up simulation of a turbocharger rotor with two semi-floating bearings. It can be shown that the consideration of fluid inertia effects introduces a significant shift of the pressure field inside the SFDs, and therefore the resulting damper force vector, at high oil temperatures and high rotational speeds. The effect of fluid inertia on the kinematic behaviour of the whole system on the other hand is rather limited for the examined rotor.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139201, s. 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The K4 graph and the inertia of the adjacency matrix for a connected planar graph
    Autorzy:
    Taliceo, Nicholas P.
    Griffith, Daniel A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2021553.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    K4 graph
    planar graph
    matrix inertia
    adjacency matrix
    Jacobian term
    Nauki Humanistyczne i Społeczne
    Źródło:
    Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 183; 185-209
    0079-3507
    Pojawia się w:
    Studia komitetu przestrzennego zagospodarowania kraju PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of inertia in the steady state pressurised flow of a non-Newtonian fluid between two curvilinear surfaces of revolution: Rabinowitsch fluid model
    Autorzy:
    Singh, U. P.
    Gupta, R.S.
    Kapur, V.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185617.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efekt bezwładności
    łożysko krzywoliniowe
    zewnętrzny przepływ ciśnieniowy
    curvilinear bearings
    Rabinowitsch fluid model
    inertia effect
    externally pressurized flow
    Opis:
    In many practical situations fluids are normally blended with additives (viscosity index improvers, viscosity thickeners, viscosity thinners) due to which they show pseudoplastic and dilatant nature which can be modelled as cubic stress model (Rabinowitsch model). The cubic stress model for pseudoplastic fluids is adopted because Wada and Hayashi have shown that the theoretical results with this model are in good agreement with the experimental results. The present theoretical analysis is to investigate the pseudoplastic effect along with the effect of rotational inertia on the pressure distribution, frictional torque and fluid flow rate of externally pressurised flow in narrow clearance between two curvilinear surfaces of revolution. The expression for pressure has been derived using energy integral approach. To analyse and discuss the effects of pseudoplasticity and fluid inertia on the pressure distribution, fluid flow rate and frictional torque, the examples of externally pressurised flow in the clearance between parallel disks and concentric spherical surfaces have been considered.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 333-349
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An adaptive particle swarm optimization algorithm for robust trajectory tracking of a class of under actuated system
    Autorzy:
    Kumar, V. E.
    Jerome, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141105.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inverted pendulum
    LQR controller
    particle swarm optimization (PSO)
    genetic algorithm
    adaptive inertia weight factor
    state feedback control
    Opis:
    This paper presents an adaptive particle swarm optimization (APSO) based LQR controller for optimal tuning of state feedback controller gains for a class of under actuated system (Inverted pendulum). Normally, the weights of LQR controller are chosen based on trial and error approach to obtain the optimum controller gains, but it is often cumbersome and tedious to tune the controller gains via trial and error method. To address this problem, an intelligent approach employing adaptive PSO (APSO) for optimum tuning of LQR is proposed. In this approach, an adaptive inertia weight factor (AIWF), which adjusts the inertia weight according to the success rate of the particles, is employed to not only speed up the search process but also to increase the accuracy of the algorithm towards obtaining the optimum controller gain. The performance of the proposed approach is tested on a bench mark inverted pendulum system, and the experimental results of APSO are compared with that of the conventional PSO and GA. Experimental results prove that the proposed algorithm remarkably improves the convergence speed and precision of PSO in obtaining the robust trajectory tracking of inverted pendulum.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 3; 345-365
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between diagonal ratio and condition number of the generalized inertia matrix of a serial-chain
    Korelacja między współczynnikiem diagonalnym a współczynnikiem uwarunkowania uogólnionej macierzy bezwładności łańcucha szeregowego
    Autorzy:
    Shah, S. V.
    Saha, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/139695.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized inertia matrix
    diagonal ratio
    ill-conditioning
    Condition Number
    uogólniona macierz bezwładności
    współczynnik diagonalny
    pomiar złego uwarunkowania
    współczynnik uwarunkowania
    Opis:
    The condition number of the Generalized Inertia Matrix (GIM) of a serial chain can be used to measure its ill-conditioning. However, computation of the condition number is computationally very expensive. Therefore, this paper investigates alternative means to estimate the condition number, in particular, for a very long serial-chain. For this, the diagonal elements of the GIM are examined. It is found that the ratio of the largest and smallest diagonal elements of the GIM, when scaled using an initial estimate of the condition number, closely resembles the condition number. This significantly simplifies the process of detecting ill-conditioning of the GIM, which may help to decide on stability of the system at hand.
    Wskaźnik uwarunkowania jest wykorzystywany jako miara złego uwarunkowania macierzy, np. dla uogólnionej macierzy bezwładności (GIM) łańcucha szeregowego. Niemniej, wyznaczenie tego współczynnika wymaga znacznego nakładu mocy obliczeniowej. Tak więc, w artykule zaproponowano sposoby alternatywne, pozwalające estymować współczynnik uwarunkowania, w szczególności dla bardzo długiego łańcucha szeregowego. W tym celu bada się elementy diagonalne uogólnionej macierzy bezwładności. Wykazano, że stosunek diagonalny (stosunek największego do najmniejszego elementu na głównej przekątnej macierzy bezwładności), przeskalowany przy użyciu estymatora początkowej wartości wskaźnika uwarunkowania, ma wartość bardzo zbliżoną do rzeczywistego wskaźnika uwarunkowania. Jego zastosowanie upraszcza w znaczący sposób ocenę złego uwarunkowania macierzy, dzięki czemu można od razu zdecydować czy układ jest stabilny.
    Źródło:
    Archive of Mechanical Engineering; 2013, LX, 1; 147-156
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-adaptive velocity tracking controller for a class of vehicles
    Autorzy:
    Herman, P.
    Adamski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/201161.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    marine vehicles
    fully actuated hovercraft
    indoor airship
    non-adaptive control
    quasi-velocities
    diagonal inertia matrix
    statek powietrzny
    quasi-prędkość
    macierz bezwładności
    Opis:
    A non-adaptive controller for a class of vehicles is proposed in this paper. The velocity tracking controller is expressed in terms of the transformed equations of motion in which the obtained inertia matrix is diagonal. The control algorithm takes into account the dynamics of the system, which is included into the velocity gain matrix, and it can be applied for fully actuated vehicles. The considered class of systems includes underwater vehicles, fully actuated hovercrafts, and indoor airship moving with low velocity (below 3 m/s) and under assumption that the external disturbances are weak. The stability of the system under the designed controller is demonstrated by means of a Lyapunov-based argument. Some advantages arising from the use of the controller as well as the robustness to parameters uncertainty are also considered. The performance of the proposed controller is validated via simulation on a 6 DOF robotic indoor airship as well as for underwater vehicle model.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 459-468
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic stability of moderately thick beams and frames with the use of harmonic balance and perturbation methods
    Autorzy:
    Obara, P.
    Gilewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200456.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bernoulli-Euler beam theory
    Timoshenko beam theory
    transverse shear deformation
    rotatory inertia
    natural frequency
    critical force
    areas of instability
    teoria wiązki Bernoulliego-Eulera
    teoria wiązki Tymoszenko
    moment bezwładności rotatora
    częstotliwość
    siła krytyczna
    obszary niestabilności
    Opis:
    The objective of this paper is to determine dynamic instability areas of moderately thick beams and frames. The effect of moderate thickness on resonance frequencies is considered, with transverse shear deformation and rotatory inertia taken into account. These relationships are investigated using the Timoshenko beam theory. Two methods, the harmonic balance method (HBM) and the perturbation method (PM) are used for analysis. This study also examines the influence of linear dumping on induced parametric vibration. Symbolic calculations are performed in the Mathematica programme environment.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 739-750
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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