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1
Content available A review of the vehicle suspension system
Jiregna Iyasu, Sirata Goftila
Journal of Mechanical and Energy Engineering
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2020
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Vol. 4, No 2
109--114
EN
The driving comfort of the vehicle is primarily determined by the design of the suspension system, which transmits the force between the vehicle and the ground. There are different types of vehicle suspension systems, including active suspension systems that provide significant benefits for ride comfort while driving. However, the existing active suspension systems have limited functions such as power, and also complex structure. To overcome the problem, the proper design of the active suspension system by considering its present limitations is essential. A well-designed active suspension system controls the load on the wheels under the resonance of the body structure and ensures driving comfort. It reduces the vibrational energy of the vehicle body caused by the excitation of the road while keeping the stability of the vehicle within an acceptable limit. For a proper design of the active suspension system, the road surface, the seat suspension, and the wheel load are the most important elements to consider. In this study, different types of vehicle suspension systems with their limitations have been thoroughly investigated. Many aspects of control and some of the essential practical considerations are also explored.
2
Content available Tool control the concentration of carbon dioxide in the flue gas boilers based on the optical absorption method
Vasilevskyi Oleksandr, Dudatiev Ihor, Ovchynnykov Kostyantyn
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
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2019
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T. 9, nr 3
30--34
EN
The methodology for controlling the concentration of carbon dioxide in flue gases from boilers is an optical absorption method with improved metrological characteristics. Studies done in the article, provided the new, scientifically-based theoretical and practical results that are essential for improving the accuracy at the required speed process, control the carbon dioxide concentration in dual gas boilers based on the optical absorption method with compensation effect on the factors optical converter.
PL
Metodologia kontroli stężenia dwutlenku węgla w spalinach kotłów wykorzystuje zjawisko absorpcji optycznej przy ulepszonych charakterystykach metrologicznych. Zaprezentowane w artykule badania dostarczyły nowych wyników, opartych na podstawach naukowych i praktycznych, które są niezbędne do poprawy dokładności przy wymaganej szybkości przebiegu procesu kontroli stężenia dwutlenku węgla w podwójnych kotłach gazowych odbywającej się na podstawie metody absorpcji optycznej z kompensacją czynników w przetworniku optycznym.
3
Content available Złożoność półgrup charakterystycznych sum prostych “AG” automatów asynchronicznych silnie spójnych ustalonych analogów rozszerzeń związanych z izomorfizmani DFASC2
Bocian S.
Autobusy : technika, eksploatacja, systemy transportowe
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2017
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R. 18, nr 12
1473--1477, CD
PL
W artykule przedstawiono i przeprowadzono dowód na wyznaczanie złożoności półgrup charakterystycznych sum prostych “AG” automatów deterministycznych skończonych asynchronicznych silnie spójnych DFASC2 (deterministic finite asynchronous strongly connected). Półgrupa charakterystyczna automatu ingeruje w algorytm obliczeniowy uogólnionych homomorfizmów automatów, zatem wyznaczanie złożoności półgrupy charakterystycznej pozwala na oszacowanie złożoności obliczeniowej uogólnionych homomorfizmów dla innych klas automatów. W zakresie modelu matematycznego koncepcja ustalonego analogu rozszerzania automatu AG związanego z izomorfizmami g0, g1,..., gq-1 gdzie q stopień rozszerzenia, przy odpowiednich założeniach symuluje automat zmienny w czasie. Automat zmienny w czasie jest adekwatnym modelem matematycznym dla wielu procesów technicznych i obliczeniowych czasu rzeczywiste. Automaty te symulują prace kilku automatów za pomocą jednego automatu zmiennego w czasie. Sumę prosta automatów można uważać odpowiednio za realizację sekwencyjnych obliczeń.
EN
The paper presents the assumption and the evidence is carried out of the simple sum complexity of characteristic semi-groups of any number (“G”) of deterministic, finite, asynchronous, highly consistent DFASC2. automata. The characteristic semi-group of the automaton interferes in the computational algorithm of the generalized homoeomorphism of the automatons. Then determination the complexity of the characteristic semi-group enables to estimate the complexity of the computational generalized homoeomorphism for the other classes of automatons. In the range of the mathematical model the conception of the determined analog of the extension of the automaton A associated with the isomorphism g0, g1,..., gq-1 where is the grade of the extensions, with the suitable assumptions it simulates the automaton variable in time. The variable automaton in time is the adequate mathematical model for the many technical and computational processes of the real time. The direct sum of automatons can be considered as the realization - sequence calculations accordingly.
4
Theoretical Evaluation of Vehicle Stability in Mountainous Areas
Dobržinskij N., Juozapavičius A.
Logistyka
|
2014
|
nr 5
321--328
EN
A probability for a vehicle to overturn when climbing a hill or when going straight downhill is rather small because the design of vehicles makes them sufficiently stable with respect to a longitudinal bank. When the vehicle is loaded and moving uphill, its rear (driving) wheels receive a substantial additional load, while the load on the front wheels decreases. Consequently, the decreased traction of the front wheels diminishes the control of the vehicle, and it can also become completely uncontrollable. The article investigates the influence of a mountainous terrain to the controllability of vehicles. Situations commonly arising during exploitation of vehicles in mountainous areas are analyzed. Theoretical calculations of sideslip angles are illustrated by examples of recent accidents of military patrol cars in Afghanistan. Realistic estimates of safe driving speeds are presented. The main reason for the high rate of accidents is found to be an overly high center of mass of reinforced vehicles under consideration.
5
Content available Optimal control system of diesel automotive engineering by example of open pit motor transport
Wójcik W., Suleimenov B., Shadrin G., Shadrin M., Porubov D.
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
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2014
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nr 1
14--17
EN
The paper investigates the optimal control system of diesel automotive engineering with application of complex criteria, depending on fuel consumption rate and travel time, with adjustable coefficients of physical process mathematical model, considering influence of disturbing effects factors. This control principle allows saving fuel consumption rate, reducing transport influence on environment, and also reducing the importance of human factor for motor transport control.
PL
W artykule zostało rozpatrzone optymalne sterowanie procesem przemieszczania pojazdów z zastosowaniem złożonego kryterium, zależnego od zużycia paliwa i czasu przejazdu, ze zmiennymi współczynnikami modelu matematycznego fizycznego procesu, uwzględniając wpływ czynników zakłócających. Otrzymany system sterowania pozwala na oszczędne zużycie paliwa, zmniejszenie wpływu transportu na środowisko i obniżenie wpływ czynnika ludzkiego na zarządzanie transportem samochodowym.
6
Content available Investigation of dynamic properties of vehicle in various friction condition simulated with use of skidcar system
Žuraulis V., Kemzūraitė K., Więckowski D.
Archiwum Motoryzacji
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2014
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Vol. 63, nr 1
89--99, 195--205
EN
In this paper, the friction characteristics of a vehicle equipped with skidcar system are analyzed. Skidcar system with attached additional wheels helps to regulate the adhesion with the road surface. Easy slipping vehicle is a useful device for driving skills improvement, carrying out various vehicle dynamics and control research activities. Important reason of skidcar systems is an ability to set low friction values in dry and good contact road conditions. Regulation of friction characteristics extends the limits of the system operation. In this case, the identification of friction characteristics is important. Vertical load of wheels and critical horizontal forces are measured in each operating mode by changing skidcar system height. Furthermore, IS04138 driving manoeuvre is performed to measure the vehicle accelerations, oscillations and slip parameters for friction evaluation in dynamic state. The performed analysis could be useful for drivers training and for further vehicle stability and control researches upon using skidcar system.
7
Content available LPV design of fault-tolerant control for road vehicles
Gáspár P., Szabó Z., Bokor J.
International Journal of Applied Mathematics and Computer Science
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2012
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Vol. 22, no. 1
173-182
EN
The aim of the paper is to present a supervisory decentralized architecture for the design and development of reconfigurable and fault-tolerant control systems in road vehicles. The performance specifications are guaranteed by local controllers, while the coordination of these components is provided by a supervisor. Since the monitoring components and FDI filters provide the supervisor with information about the various vehicle maneuvers and the different fault operations, it is able to make decisions about necessary interventions into the vehicle motions and guarantee reconfigurable and fault-tolerant operation of the vehicle. The design of the proposed reconfigurable and fault-tolerant control is based on an LPV method that uses monitored scheduling variables during the operation of the vehicle.
8
Jak dalece można sterować ruchem pojazdu? Problem odstępów w ruchu
Molecki B.
Infrastruktura Transportu
|
2011
|
nr 6
32-36
PL
Podczas Dolnośląskiego Festiwalu Nauki, w ramach Dnia Transportowego na Politechnice Wrocławskiej, 17 września 2011 roku odbył się wykład poświęcony zagadnieniu, jak dalece można sterować ruchem pojazdu? Artykuł rozpoczyna cykl rozważań pod wspólnym tytułem. Jako pierwszy przedstawiony zostanie problem utrzymywania właściwych odstępów między pojazdami, a więc odpowiedniego wyboru toru ruchu i jazdy w bezpiecznej odległości za poprzednikiem.
EN
During the Lower Silesian Science Festival, which was a part of the Day of Transport at the Technical University in Wrocław, on 17th of September 2011 a lecture on the issue of how far you can control the movement of the vehicle was held. The article starts a series of articles under common title. As the first the problem of maintaining the proper spacing between vehicles and therefore the appropriate choice of track traffic and driving at a safe distance behind its predecessor will be presented.
9
Content available Experimental evaluation of perception and actuation architectures for the articulated vehicle automatic control
Armada M., Montes H., Salinas C., Sarria J.
Pomiary Automatyka Robotyka
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2010
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R. 14, nr 2
67-72
EN
Nowadays, with highly developed instrumentation, sensing and actuation technologies it is possible to foresee an important advance in the field of autonomous and semi-autonomous transportation systems. Among the most promising transport infrastructures the articulated bus is an interesting, low cost and friendly option. In this paper an experimental set-up for research on automatic control of articulated bus is presented. Comprised by a mobile platform (the articulated bus) fully instrumented and a ground test area of asphalt roads inside CSIC premises, this experimental facility allows full testing of automatic driving systems. Paper presents obtained experimental results linked to real time testing of proposed control-perception architectures and a human-machine-interface developed to ease progress in control system evaluation.
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