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Tytuł:
The model of diagnostic of nonlinear viscoelastomeric damper
Model diagnostyczny nieliniowego lepko-sprężystego tłumika drgań
Autorzy:
Warczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/327230.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
vibration damping
nonlinear effects
diagnosis
diagnostic model
tłumienie drgań
efekty nieliniowe
diagnozowanie
model diagnostyczny
Opis:
Damping of mechanical vibrations is often realized by viscous dampers with nonlinear characteristic. The progressive wear them leads to a deterioration of working conditions of machinery and vehicles. Bad technical condition of the damper also adversely affects the occupants of the means of transport. In many cases, there are no effective methods for determining their condition. The aim of the study was to develop a computational model of the viscous damper takes account of the characteristics such as nonlinearity and asymmetry and its dependence on the parameters of extortion. Taking into account the impact of these factors on the instantaneous value of the force generated by the element enables the use of computational model to determine the technical condition.
Tłumienie drgań mechanicznych jest często realizowane przez tłumiki wiskotyczne o nieliniowych charakterystykach. Stopniowe ich zużywanie się prowadzi do pogorszenia warunków pracy maszyn i pojazdów. Zły stan techniczny tłumika drgań wpływa również niekorzystnie na osoby przebywające w środkach transportu. W wielu przypadkach brak jest skutecznych metod określania ich stanu technicznego. Celem badań było opracowanie modelu obliczeniowego wiskotycznego tłumika drgań uwzględniającego jego cechy takie jak nieliniowość i niesymetryczność charakterystyki oraz jej zależność od parametrów wymuszenia. Uwzględnienie wpływu wymienionych czynników na chwilowe wartości siły generowanej przez taki element umożliwia wykorzystanie modelu obliczeniowego do wyznaczania miar stanu technicznego.
Źródło:
Diagnostyka; 2014, 15, 4; 29-34
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of a glass gatherer robot arm with a frictional damper
Autorzy:
Stembalski, M.
Pres, P.
Skoczynski, W.
Turek, P.
Powiązania:
https://bibliotekanauki.pl/articles/99808.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
numerical model
damping vibration
glass gatherer
robot
Opis:
A numerical model of a friction damper used for damping vibration in glass gatherer robots was described. The damper with a lance was modelled using finite elements. Primary natural frequency of the system was determined. Numerical calculations were performed to determine the best operating parameters of the damper for excitations using a impulse of a force. Results of the damping decrement calculations for the friction damper model with a constant coefficient of friction and for the model, in which the coefficient of friction varied depending on the sliding velocity and the normal pressure occurring at the contact surfaces of the damper’s friction rings, were presented. Based on numerical simulations, the values of relative displacements between the damper’s friction rings were also determined.
Źródło:
Journal of Machine Engineering; 2018, 18, 4; 127-140
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of fricional damper for glas – making robot lance
Autorzy:
Stembalski, M.
Skoczyński, W.
Roszkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/247991.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
robot
vibration damping
friction damper
numerical model
damping decrement
Opis:
The need to design a friction damper for glass-making robots arose because of the excessive vibrations, which occur in the course of their work. The robots are commonly used in the manufacture of glassware. The vibrations adversely affect the work of ball gatherers, which results in a large number of defects in the finished glass products. As a result of the vibrations molten glass may become unevenly distributed on the ball's surface and as the material flows down the ball into the mould the thermal conditions of its solidification may change. It is proposed to damp the vibrations by means of a prototype friction damper mounted directly on the ball gatherer lance. The glass-making robot lance with the friction damper was modelled. The vibrations of the glass-making robot lance tip under static load and impact excitation were measured during simulations. Also the relative displacements of the damper rings in the course of the excitations were measured. Moreover, the dependence between the preload force and the system's damping decrement was determined. The main aim was to select proper operating parameters for the proposed structure in order to obtain maximum system damping.
Źródło:
Journal of KONES; 2012, 19, 1; 391-398
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-linear modelling of elastic hysteretic damping in the time domain
Autorzy:
Spitas, C.
Dwaikat, M. M. S.
Spitas, V.
Powiązania:
https://bibliotekanauki.pl/articles/38606055.pdf
Data publikacji:
2020
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
hysteresis
damping
modified viscous model
dynamics time-domain
mechanical vibration
frequency
non-linear modeling
Opis:
Elastic hysteretic damping is defined as the dissipation of energy at a rate that is weakly dependent on frequency of vibration. In this article, we propose that the elastic hysteretic damping can be achieved by a simple modification to the viscous damping model. The proposed modification is based on computing an instantaneous correction factor that recursively depends on the state variables of the system. This correction factor is related to the rate by which the velocity changes with respect to the displacement. The new model compares quite favourably with the other existing solutions in the time-domain and differences between the solutions become evident for higher damping ratios. It is found that the new model predicts consistently the weak variation in the loss factor as a function of frequency. In addition to its simple mathematical formulation, the proposed model is superior to the existing solutions in that it does not require knowledge of the past history of motion neither the knowledge of the excitation frequency and is extensible to any type of loading. Various aspects pertaining to the linearity of the proposed approach are finally discussed.
Źródło:
Archives of Mechanics; 2020, 72, 4; 323-353
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and verification of a shock absorber and its shim valve model based on the force method principles
Modelowanie i ocena amortyzatora i jego zaworu talerzowego oparte na zasadach metody sił
Autorzy:
Skačkauskas, P.
Žuraulis, V.
Vadluga, V.
Nagurnas, S.
Powiązania:
https://bibliotekanauki.pl/articles/300782.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
damping characteristics
force method
mathematical model
monotube
shock absorber
shim valve
charakterystyka tłumienia
metoda sił
model matematyczny
amortyzator jednorurowy
zawór talerzowy
Opis:
W danej publikacji został opisany model matematyczny zaworu talerzowego jednorurowego amortyzatora, wyprowadzenia którego zastosowano metodę sił. Metoda ta wyraża związki pomiędzy przemieszczeniami i siłami działającymi na elementy amortyzatora. Stosowanie metody sił w praktycznej sferze modyfikacji amortyzatorów samochodowych pozwala efektywnie analizować wpływ różnych parametrów, w tym ilość, wzajemne położenie i właściwości materiałów talerzy zaworu, na generowaną amortyzatorem wielkość siły tłumienia. Tłumienie, które generuje amortyzator, wywiera znaczący wpływ na komfort jazdy samochodem oraz jego dynamikę. W publikacji również został stworzony kompletny model jednorurowego amortyzatora. Walidacja modelu matematycznego oraz możliwość zastosowania jego w praktyce zostały ocenione na podstawie eksperymentalnych pomiarów charakterystyk amortyzatorów na specjalnym stanowisku.
In this paper, a mathematical model of a monotube shock absorber’s shim valve, which is developed by applying the force (flexibility) method, is described. This method expresses the relationship between displacements and the forces existing in the shock absorber structure. An application of the force method in the field of practical modification of vehicle shock absorbers enables to effectively analyse the influence of a wide range of parameters, including the number of shims in the valve, their disposition and the properties of the material on the level of the damping force. The damping of the shock absorber considerably impacts comfort and road holding characteristics of the vehicle. In addition, a whole model of a monotube shock absorber is designed in this paper. The validation and practical application of the mathematical model were evaluated by carrying out experimental measuring of the characteristics of the shock absorber using a special stand.
Źródło:
Eksploatacja i Niezawodność; 2017, 19, 1; 126-133
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viscoelastic Characterization of Different Solid Rocket Propellants Using the Maxwell Spring-Dashpot Model
Autorzy:
Shekhar, H.
Kankane, D. K.
Powiązania:
https://bibliotekanauki.pl/articles/358207.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
damping coefficient
Maxwell model
rocket propellants
spring constant
tensile test
viscoelastic properties
Opis:
A single spring and a single dashpot in series was utilized to simulate the stress-strain curve for different classes of solid rocket propellants, namely extruded double base propellants (EDBP) and composite propellants (CP), in the uniaxial tensile mode in a constant rate of travel machine. The propellant behaves as a viscoelastic material and invariably exhibits stress relaxation, which cannot be simulated by elastic mechanical property parameters. In order to generate a complete stress-strain curve of a solid rocket propellant under tensile testing, different classes of solid rocket propellants were evaluated and the stress-strain curve generated was modelled using the single spring-single dashpot Maxwell fluid model. Using two constants, called the spring constant (K) and the damping factor (D), it was possible to generate a complete stress-strain curve. Mathematical formulation gives the stress (σ) - strain (ε) relation as….[wzór]. Additionally the physical nature of the spring constant resembles that of the elastic constant and the damping coefficient gives the contribution of the viscous part of the load bearing capacity of solid rocket propellants. The development of a general mathematical formulation, the calculation of constants for different classes of propellants and insight into the viscoelastic nature of propellants are the main themes of this article. For all classes of propellants, two ratios are defined. The first is a dimensionless parameter 'H', which is the ratio of the spring constant to the initial elastic modulus. The second is the ratio of the damping coefficient to the spring constant depicted by parameter 'S'. The spring constant is higher than the initial elastic modulus and the value of 'H' is always higher than 1. For brittle propellants (extruded double base propellants, EDBPs, with a high elastic modulus), the spring constant is numerically very close to the spring constant (H is around 1.75). As the ductility (percentage elongation) of the solid rocket propellants increases (from cartridge loaded composite propellants, CLCPs, to case-bonded composite propellants, CBCPs), the value of parameter 'H' also increases (H ~ 10 for CP). For EDBPs the parameter 'S' is smaller (~ 1.24), but for CLCPs and CBCPs, it is high (S ~ 5 to 8). Both of these ratios are basic properties of the polymeric matrix. The first ratio depicts the departure of the actual stress-strain curve from linearity, while the second ratio is another way of expressing the relaxation time. A higher 'H' indicates a softer and more ductile propellant, while a higher 'S' indicates a shorter relaxation time for the propellant. A lower 'S' indicates that the propellant recovers faster on removal of strain.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 3; 189-199
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modal analysis of frame structures with semi-rigid joints and viscoelastic connections modeled by fractional derivatives
Autorzy:
Pawlak, Z. M.
Łasecka-Plura, M.
Zak-Sawiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/38697100.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
viscoelastic connection
rotational damping
rheological fractional model
dynamic characteristics of structure
modified finite element
Opis:
The paper presents two methods of solving the problem of the dynamics of a frame structure with viscoelastic bonds in nodes. In the first approach, known from the literature, two-node beam elements with three degrees of freedom in each node were used. Exact shape functions were adopted to obtain a stiffness matrix, a consistent mass matrix and a damping matrix for the beam element. These matrices were then modified by introducing rotational viscoelastic constraints at the boundary nodes. In the second approach, a new method of modelling viscoelastic bonds in frame structures was proposed. It consists in removing rigid bonds between elements along selected degrees of freedom and replacing them with a new, additional element with viscoelastic properties. This approach allows the use of any rheological model to describe viscoelastic bonds (i.e. an additional element) without the need to create a new modified finite element. In this work, an advanced rheological model, i.e. the fractional Kelvin model, was used to describe rotational viscoelastic bonds. The use of fractional derivatives to describe the damping properties reduces the number of parameters needed in the model, but leads to a non-linear eigenproblem. In order to solve the eigenvalue problem, the continuation method was used, and the dynamic characteristics of the structure were determined on the basis of the calculated eigenvalues. Selected structures with viscoelastic nodes were analyzed and the obtained results confirm the effectiveness of the proposed approach.
Źródło:
Archives of Mechanics; 2023, 75, 3; 337-363
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of the Mathematical models of the integral drilling indices based on the Dimensional analysis
Autorzy:
Moisyshyn, V.
Borysevych, B.
Yytyaz, O.
Gavryliv, Y.
Powiązania:
https://bibliotekanauki.pl/articles/299197.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
axial static load on the well bottom-hole
angular speed of the drill bit rotation
mathematical model
mechanical drilling speed
average value of torque on the bit
energy intensity for the rock destruction process on the well bottom-hole
stiffness and damping of the drilling tools
Opis:
The dimensional analysis method was used to estimate the influence of the axial static load on the bottom-hole, angular speed of the drill bit rotation, stiffness, and damping of the drilling tools on the integral indices of well drilling. The mathematical models of the mechanical drilling speed, average values of torque on the bit, and energy consumption for the rock destruction process on the well bottom-hole were developed for two interlayers of the Vorotyshchenska formation with the hardness of 1440 and 2050 MPa.
Źródło:
AGH Drilling, Oil, Gas; 2014, 31, 3; 431-440
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of modelling and simulation to evaluate the theta method used in diagnostics of automotive shock absorbers
Autorzy:
Lozia, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/2124764.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
frequency domain analysis
quarter car model
theta method
suspension damping
automotive diagnostics
Opis:
The dynamic properties of the car's suspension largely depend on the damping that results from the state of the shock absorbers. Their technical condition is essential for vehicle occupants’ comfort and traffic safety. It changes with the time and intensity of use of the vehicle. Therefore, adequate methods of non-destructive (diagnostic) testing of suspension damping have been sought for many years. The on-vehicle tests are particularly useful thanks to their low cost and short test duration time. The newest method is the ‘theta’ method which is the subject of the presented article. Notation ‘theta’ usually means relative damping (damping ratio) in the vibrating system. The paper asses four variants of the method. Two versions come from modal analysis and are also known as the ‘peak-picking method’ or ‘half-power method’. Two other versions are described in cited patent documentations. Three linear ‘quarter car' models with their description in the frequency domain were used to assess mentioned variants of the ‘theta’ method. Calculations were made for two typical datasets corresponding to the front and rear suspension system of a medium-class motor car. This provided grounds for general qualitative and (within a limited scope) quantitative assessment of the usefulness of individual variants of the method under analysis and for comparisons between them. The paper is to help in choosing the variant of the ‘theta’ method that would most likely find the application and that might be recommended to manufacturers and would-be purchasers of diagnostic suspension testers. The author has also highlighted the importance of possible further research.
Źródło:
Archiwum Motoryzacji; 2022, 96, 2; 5--30
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of a linear half-vehicle model for the optimization of damping in the passive suspension system of a railway car
Autorzy:
Lozia, Z.
Kardas-Cinal, E.
Powiązania:
https://bibliotekanauki.pl/articles/224025.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
railway vehicle
suspension system
damping coefficient
optimization
half-vehicle model
pojazd kolejowy
układ zawieszenia
współczynnik tłumienia
optymalizacja
Opis:
The paper presents a methodology of optimizing the parameters of the passive suspension system of a railway vehicle. A linear half-vehicle model and an example of the procedure carried out to optimize a selected parameter of the model have been demonstrated. A method of the selection of damping in the suspension system of a railway vehicle, based on over 40-year achievements of the cited authors of publications in the field of motor vehicles, has been shown. The optimization of linear damping in the secondary suspension system of a passenger carriage moving on a track with random profile irregularities has been described in detail. The algorithms adopted for the calculations have a wider range of applicability; especially, they may be used for determining the optimum values of the other parameters of the railway vehicle model under analysis, i.e. stiffness of the secondary suspension system as well as stiffness and damping of the primary suspension system.
Źródło:
Archives of Transport; 2016, 39, 3; 31-49
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of a linear quarter-car model to optimize the damping in a passive automotive suspension system – a follow-on from many authors’ works of the recent 40 years
Zastosowanie liniowego modelu „ćwiartki samochodu” do optymalizacji tłumienia w pasywnym zawieszeniu samochodu – wykorzystanie prac wielu autorów z okresu ostatnich 40 lat
Autorzy:
Lozia, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1363546.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
optimization
automotive suspension system
quarter car model
damping in the suspension system
optymalizacja
zawieszenie samochodu
model ćwiartki samochodu
tłumienie w zawieszeniu
Opis:
In this study, over 40-year achievements of many foreign and Polish authors in the field of methods of optimizing the characteristics of automotive suspension systems have been used. A method of conducting the optimizing calculations, further developed by the author, has been presented and exemplified by calculations of viscous damping in the passive suspension system of a vehicle moving on an uneven road surface with a random profile. To determine the discomfort and safety hazard measures, a linear quarter-car model of the suspension system and the spectral transmittance analysis method were employed. The results have been shown in the form of a dimensionless objective function, which was taken as a criterion of optimization in respect of ride comfort and safety. The limitation of deflections of the suspension system has been taken into account, too. The graphic form of this function, whose argument is the dimensionless suspension damping coefficient, resembles the pictorial qualitative relationships, shown in many publications by other authors and facilitating the interpretation of final results of the optimization.
W pracy wykorzystano ponad 40-letnie osiągnięcia wielu autorów zagranicznych i polskich w zakresie metod optymalizacji parametrów zawieszenia samochodu. Zaprezentowano, rozwiniętą przez autora, metodykę obliczeń optymalizacyjnych na przykładzie tłumienia wiskotycznego pasywnego zawieszenia pojazdu poruszającego się po nierównej, losowej nawierzchni drogi. Wykorzystano liniowy model zawieszenia ćwiartki samochodu oraz analizę transmitancji widmowych w wyznaczaniu wskaźników dyskomfortu i niebezpieczeństwa. Wyniki zaprezentowano w postaci bezwymiarowej funkcji celu, która stanowiła kryterium optymalizacji ze względu na komfort jazdy i bezpieczeństwo. Uwzględniono także ograniczenie ugięć zawieszenia. Graficzna postać tej funkcji, gdzie zmienną niezależną jest bezwymiarowy współczynnik tłumienia zawieszenia, przypomina poglądowe, jakościowe zależności przytaczane w wielu pracach innych autorów, co ułatwia interpretację wyników końcowych optymalizacji.
Źródło:
Archiwum Motoryzacji; 2016, 71, 1; 39-71
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uniform stability in structural acoustic systems with thermal effects and nonlinear boundary damping
Autorzy:
Lasiecka, I.
Lebiedzik, C.
Powiązania:
https://bibliotekanauki.pl/articles/206079.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nonlinear boundary damping
structural acoustic model
thermoelastic plates
uniform stabilization
Opis:
The stabilization problem for a structural acoustic model is considered. The model under consideration is that of acoustic cavity (wave equation) coupled at the interface with a flexible wall (plate equation) which accounts for thermal effects. It is shown that frictional, nonlinear damping applied at the boundary of the acoustic chamber provides the uniform decay rates for the energy function of the overall structure. The main novelty of this result, with respect to the literature, is that the uniform stability for the model is established without assuming any mechanical damping the wall.
Źródło:
Control and Cybernetics; 1999, 28, 3; 557-581
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic characteristics of the technological complex based on parallel mechanisms of kinematics
Charakterystyki dynamiczne mechanizmów technologicznych opartych na kinematyce równoległej
Autorzy:
Gurzhіj, A. A.
Strutins'kij, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/258380.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
technological complex spatial system
drive
frequency response
pulse characteristic
natural frequencies
damping parameter
mathematical model
transfer function
złożony system przestrzenny
napęd
pasmo przenoszenia
charakterystyki impulsowe
częstotliwości naturalne
parametr tłumienia
model matematyczny
Opis:
The technique and results of experimental studies of dynamic characteristics of spatial Drive Systems, which includes six coordinate parallel kinematic machine and system manipulation as six coordinate table. The amplitude-frequency and impulse response relative movement of the table and platform machine based on the analysis of characteristics from the mathematical model of the spatial system drive as the transfer function and defines the numerical parameters of the model. Technological complex spatial systems, drives, frequency response, pulse characteristics, natural frequencies, damping parameters, mathematical models, transfer functions.
W artykule przedstawiono metodykę oraz wyniki badań eksperymentalnych charakterystyki dynamicznej przestrzennych systemów napędowych maszyny, na które składa się sześć współrzędnych równoległej kinematyki i manipulacji systemu. Częstotliwości i amplitudy odpowiedzi impulsowej względnego ruchu maszyny, obejmującej stolik oraz platformę ustalono na podstawie analizy cech modelu matematycznego systemowego dysku przestrzennego, który traktowano jako funkcję przenoszenia umożliwiającą zdefiniowanie parametrów numerycznych modelu.
Źródło:
Problemy Eksploatacji; 2014, 1; 57-69
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of grid disturbances on current source rectifier controlled by FCS-MPC algorithm
Autorzy:
Godlewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1193668.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
active front end
current source rectifier
model predictive control
active damping
Opis:
Nowadays, the increasing number of non-linear loads influences the grid, causing grid voltage disturbances. These disturbances may be very dangerous for the equipment and can create faults in converter behaviour. However, the right control algorithm can improve the reliability of the work. For a current source rectifier, the finite control set model predictive control has been proposed. This method is very flexible because of the variety of the possible cost function forms. It has been examined under grid voltage disturbed by the higher harmonics and the voltage drop. Simulation results prove the ability to damp the distortions and to ensure the unity power factor. Summing up, the algorithm is a very good solution for use in applications such as battery charging, active power filtering and low-voltage direct current load feeding.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 11-22
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Tyre-Road Noise with Data Mining Techniques
Autorzy:
Freitas, E.
Tinoco, J.
Soares, F.
Costa, J.
Cortez, P.
Pereira, P.
Powiązania:
https://bibliotekanauki.pl/articles/177590.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tyre-road noise
data mining
model
texture
damping
surface characteristics
Opis:
The research aimed to establish tyre-road noise models by using a Data Mining approach that allowed to build a predictive model and assess the importance of the tested input variables. The data modelling took into account three learning algorithms and three metrics to define the best predictive model. The variables tested included basic properties of pavement surfaces, macrotexture, megatexture, and unevenness and, for the first time, damping. Also, the importance of those variables was measured by using a sensitivity analysis procedure. Two types of models were set: one with basic variables and another with complex variables, such as megatexture and damping, all as a function of vehicles speed. More detailed models were additionally set by the speed level. As a result, several models with very good tyre-road noise predictive capacity were achieved. The most relevant variables were Speed, Temperature, Aggregate size, Mean Profile Depth, and Damping, which had the highest importance, even though influenced by speed. Megatexture and IRI had the lowest importance. The applicability of the models developed in this work is relevant for trucks tyre-noise prediction, represented by the AVON V4 test tyre, at the early stage of road pavements use. Therefore, the obtained models are highly useful for the design of pavements and for noise prediction by road authorities and contractors.
Źródło:
Archives of Acoustics; 2015, 40, 4; 547-560
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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