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    Wyświetlanie 1-6 z 6
    Tytuł:
    Simulation evaluation of the influence of selected geometric parameters on the operation of the pneumatic braking system of a trailer with a differential valve
    Autorzy:
    Szpica, Dariusz
    Kisiel, Marcin
    Czaban, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2105991.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    mechanical engineering
    air braking system
    differential valve
    simulation
    Opis:
    This article presents simulation models of trailer air brake systems in configurations without a valve and with a differential valve, thus demonstrating the rationale for using a valve to improve system performance. Simplified mathematical models using the lumped method for systems without and with a differential valve are presented. The proposed valve can have two states of operation depending on the configuration of relevant parameters. These parameters can include the length of the control pipe, the throughput between chambers in the control part of the valve and the forcing rise time. Based on the calculations, it was found that the differential valve with large control pipe lengths can reduce the response time of the actuator by 42.77% relative to the system without the valve. In the case of transition of the valve to the tracking action, this time increases only by 9.93%. A force rise time of 0.5 s causes the transition of the valve from the accelerating action to the tracking action, with 9.23% delay relative to the system without a valve. The calculations can be used in the preliminary assessment of the speed of operation of pneumatic braking systems and in the formulation of guidelines for the construction of a prototypical differential valve. In conclusion, it is suggested to use a mechatronic system enabling smooth adjustment of the flow rate between chambers of the control system of the differential valve.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 233--241
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obliczenia dynamiczne pneumatycznego zaworu przekaźnikowego
    Dynamic calculations of pneumatic relay valve
    Autorzy:
    Kamiński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/387407.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    dynamika
    układ hamulcowy
    pneumatyczne układy hamulcowe
    pneumatic braking valves
    dynamic
    braking system
    Opis:
    W pracy przedstawiono równania dynamiki zaworu przekaźnikowego stosowanego w pneumatycznych układach hamulcowych pojazdów. Opracowany model matematyczny zaworu wykorzystano do symulacji w programie Matlab- Simulink procesów przejściowych w dwuobwodowym układzie napędowym z siłownikiem tłokowym jednostronnego działania. Przedstawiona metoda obliczeń dynamicznych może być wykorzystana do doboru parametrów konstrukcyjnych elementów instalacji ze względów na stawiane wymagania, w tym szybkość działania pneumatycznego układu hamulcowego.
    The article deals with some dynamic equations of relay valve used in vehicles pneumatic brake systems. The relay mathematical model was used to simulate transition processes in a pneumatic two-circuit drive with one-acting cylinder in Matlab-Simulink. The introduce method of dynamic counts of the system may be used to select design parameters of elements with regards to the requirements and operation speed of pneumatic brake system.
    Źródło:
    Acta Mechanica et Automatica; 2009, 3, 1; 62-64
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of pressure fluctuations on the temperature during braking
    Autorzy:
    Topczewska, Katarzyna
    Zamojski, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/386606.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    braking
    pressure fluctuations
    pad/disc system
    temperature
    Opis:
    The aim of this study is to develop the numerical–analytical model of frictional heating in a pad/disc system during braking including the pressure fluctuations, engendered by the pump in an anti-skid braking operation. For this purpose, the problem of motion and the one-dimensional thermal problem of friction for a semi-space/semi-space tribosystem were formulated and solved. Obtained solutions allow to calculate temperature distribution on the contact surface and inside the friction elements. Thermal analysis was performed for a metal–ceramic pad and a cast iron disc during one-time braking including the time-dependent, oscillating pressure. The influence of amplitude of pressure fluctuations on the temperature variations was investigated, especially on the value of maximum temperature achieved during braking.
    Źródło:
    Acta Mechanica et Automatica; 2020, 14, 2; 103-107
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convective Cooling of a Disc Brake During Single Braking
    Autorzy:
    Adamowicz, A.
    Grześ, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/387158.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    hamowanie
    metoda elementów skończonych
    braking
    pad/disc system
    finite element method
    convective cooling
    Opis:
    This study is primarily focused on the investigation of an impact of heat transfer coefficient on heat dissipation from the solid disc using the finite element method (FEM). The analysis was carried out within four individual cases of braking of the passenger vehicle simulating mountain descent with different velocities and the following release periods, where the convective terms of cooling were dependent on the angular velocity of the disc. For the purpose of confronting contrasting conditions of the braking action, apart from heating region, the whole surface of the disc was insulated. The process was performed under the operation conditions of a real front disc brake, whose dimensions and thermophysical properties of materials were adopted and applied to the FE model. It was concluded that the influence of cooling of the exposed surfaces of the disc during relatively short braking is insignificant. However the period after brake release results in considerable decrease in temperature of the disc.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 2; 5-10
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of the optimal braking force distribution in three-axle trailers with tandem suspension
    Autorzy:
    Kamiński, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2105986.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    agriculture trailer
    tandem axles
    air braking system
    braking force distribution
    optimization
    Opis:
    Heavy agricultural trailers can be equipped with a three-axle chassis with a tandem axle set at the rear and one mounted on a turntable at the front. In such trailers, selection of the distribution of braking forces that meet the requirements of the EU Directive 2015/68, with regard to braking, largely depends on the type of tandem suspension used. The requirements for brake force distribution in agricultural trailers of categories R3 and R4 are described. On this basis, a methodology for calculating the optimal linear distribution of braking forces, characteristic of agricultural trailers with air braking systems, was developed. An analysis of the forces acting on a 24-tonne three-axle trailer during braking was performed for five different suspensions of the rear tandem axle. An optimization algo-rithm using the quasi Monte Carlo method was described, on the basis of which a computer program for selection of the linear distribution of braking forces was developed. The calculations were made for an empty and loaded trailer with and without the weight of the tandem suspension. The most uniform distribution of braking forces was obtained for two leaf spring with dynamic equalization and air suspension, in which the ratio of the braking force of the tandem axle and the total braking force varied between 22.9% and 25.5% for the different calculation variants. A large variation in the braking force distribution was achieved for the two leaf spring suspension, in which the ratio of tandem axle braking force and the total braking force ranged from 2.7% to 6.4% for the leading axle and from 27.8% to 36.2% for the trailing axle. The presented calculation methodology can be used in the initial phase of the design of air braking systems for three-axle agricultural trailers.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 189--199
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A flywheel-based regenerative braking system for railway vehicles
    Autorzy:
    Jackiewicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2204653.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    railway brakes
    flywheel
    regenerative braking system
    Opis:
    Regenerative braking is a technique that employs electric motors to convert the dynamic mechanical energy from the motor’s spinning rotor and any attached loads into electricity. However, such a type of regenerative braking can only slow but not stop the vehicle because there is too little energy to excite the motor acting as a generator at low speeds. Therefore, this paper presents a unique flywheel-based regenerative braking system for railway vehicles. This system is supposed to meet high safety and comfort expectations in all operating conditions. The braking action control of this system should allow braking of empty or loaded vehicles according to load, the anti-blockage braking action of wheels and prevent wheel-slide during braking or wheel slip during acceleration. The new regenerative braking system under development, like any kinetic energy recovery system, requires the application of continuously variable transmission. The essence of the new solution is to design and build this type of variable transmission using only one planetary gear controlled through the powertrain control module for an electric motor cooperating concurrently. This paper describes complete modelling and simulation realisation on a closed-loop servomotor drive, which cooperates with the variable transmission of the regenerative braking system based on the Scilab/Xcos environment.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 52--59
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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