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Wyświetlanie 1-5 z 5
Tytuł:
Pre-departure sequencing method in the terms of the dynamic growth of airports
Autorzy:
Kwasiborska, A.
Stelmach, A.
Powiązania:
https://bibliotekanauki.pl/articles/246336.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air transport
simulation of air traffic
pre-departure sequencing of aircraft
Opis:
The increase in air traffic requires organizational changes at the airport and near the airport. To ensure appropriate airport operating efficiency, it is becoming necessary to provide unobstructed flow of information between all parties involved in the process. Common decision-making process regarding operations carried out at an airport, based on legible information, may contribute to faster and more precise prediction of sequence of events. This article aims to present pre-departure sequencing method in the terms of the dynamic growth of airports. This method dynamically defines current sequencing of departing aircraft with consideration of time required to maintain minimum separation between subsequent take offs and evaluates runway occupancy regarding planned arrivals. Developed method uses criteria of reduction maximum delay on one handling position, which is starting runway in use. It is carried out by sequencing tasks, in accordance with non-decreasing requested times of completion. Greedy algorithm has been used to define sequence of carrying out take off operations based on the earliest possible time of the departure. Faced with dynamic growth of airports, this method may contribute to improvement of predictability of events, and thus facilitate proper decision making, which will allow managing airport traffic smoothly and without unnecessary downtimes.
Źródło:
Journal of KONES; 2016, 23, 4; 253-260
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the process of vehicle stopping with the use of emergency braking system
Autorzy:
Aleksandrowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/241747.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
braking
braking simulation
road traffic safety
Opis:
Road traffic poses high risk to human health and life and material objects. In an emergency situation, it is crucial for a driver to be able to reduce speed of the vehicle and pull up as quickly as possible. The braking distance of a vehicle depends on many factors including the surface condition and the braking system efficiency. During maintenance of a vehicle, the elements of a braking system undergo wear processes and failures. Therefore, producers equip vehicles with emergency braking systems, which can stop a car in the event of the main braking system failure. Cars in Poland are of diversified age therefore many different design solutions can be found. In this study, the problems connected with stopping a car in case of the brakes failure has been discussed according to the type of brake actuation system. Simulation calculations were performed with the use of computer tool V-SIM4, and the obtained results allow to find a braking design with the highest efficiency in terms of braking distance and maintenance of the vehicle direction in case of the main system failure. The research results make it possible to formulate a general conclusion that structures of emergency braking systems should be used in the following order: fully doubled, LL, HI whereas systems TT and X should be replaced by systems LL or possibly HI.
Źródło:
Journal of KONES; 2016, 23, 1; 9-15
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of the model of proecological transport system
Autorzy:
Jachimowski, R.
Kłodawski, M.
Lewczuk, K.
Szczepański, E.
Wasiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/245589.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
proecological transport system
transport
simulation
traffic modelling
emissions of harmful compounds of exhaust gases
Opis:
Paper presents assumptions to build simulation model allowing computational experimentation and inference on impact of various factors on transport modal split and the impact that transport has on environment. It presents a general mathematical model of environmentally friendly transport system and characterizes particular elements of this model. The structure of transport network is mapped with a graph. The characteristics describing elements of this structure, vehicles, and characteristics of harmful compounds emission are given. Model will be implemented in PTV VISUM environment – a tool supporting planning of transport processes as well as analysis and designing of transport systems. The model of proecological transport system developed in PTV VISUM will consist of model of demand for both passenger and freight transport, and model of transport network cooperating with various means of transport. Road and rail vehicles for passenger and freight transport are characterized and divided into groups according to type of fuel and harmful emission. The demand for transport services and emission of exhaust gases components are reflected in model of proecological transport system of Poland. The last part of paper presents a sample of preliminary research on estimating emission from particular type of vehicle.
Źródło:
Journal of KONES; 2013, 20, 4; 129-139
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of technical conditions and the age structure of vehicles on traffic emission
Autorzy:
Filipczyk, J.
Kutrzyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/242063.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
road transport
traffic emission
technical condition of the vehicles
age structure of vehicles
simulation
Opis:
The article presents the results of the simulation of the traffic emission from vehicles for different type of roads. The calculations of emission have been made by using the methodology which is used in Europe. To register the number and the type of vehicles for each road a digital camera was used. The traffic stream has been recorded in the same length of time. The investigations have been made for different classes of roads with different types of vehicles. There was estimated number of the vehicles per vehicle category and the agę structure of the vehicles for each type of road. The vehicles have been divided into different exhaust emission legislation classes. Additionally, measurements of the group of 300 different vehicie have been made. Those measurements provided information about the level of emission from each vehicle. The total vehicle emission was calculated depending on the type of road, the number of vehicles, the number of vehicles per vehicle category, the age structures, the average speed per vehicle type etc. At first, the simulation of the traffic emission from vehicles was made, taking into consideration the fact, that the vehicles are in good technical conditions. Next, the calculation was made for real technical conditions of vehicles. This investigation has shown that the technical conditions of the vehicles have an important influence on the estimated emission level.
Źródło:
Journal of KONES; 2009, 16, 3; 99-106
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conversion of energy in electric drive supported by the hydrostatic drive
Autorzy:
Grzesikiewicz, W.
Makowski, M.
Knap, L.
Pokorski, J.
Powiązania:
https://bibliotekanauki.pl/articles/247488.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
numerical simulation
hybrid drive
electric drive
hydrostatic drive
energy conversion
city traffic
symulacja numeryczna
napęd hybrydowy
napęd elektryczny
napęd hydrostatyczny
konwersja energii
ruch miejski
Opis:
In the article, a study of conversion of energy in a hybrid (electro-hydrostatic) drive of a utility van intended for city traffic is described. In this hybrid drive, the electric drive is periodically accompanied by hydrostatic drive, especially during acceleration and regenerative braking of the vehicle. We present a mathematical model of the hybrid drive as a set of dynamics and regulation equations of the van traveling at a given speed. On this basis, we construct a computer program, which we use to simulate the processes of energy conversion in electro-hydrostatic hybrid drive. The main goal of the numerical simulation is to assess the possibility of reducing energy intensity of the electric drive through such a support of the hydrostatic drive. Our results indicate that it is possible to significantly increase the efficiency of energy conversion in the electric drive by support of the hydrostatic drive. In the article, chosen results of simulation studies for multiple starting and braking the car are given, and they show a 30% decrease for energy drawn by the hybrid drive, compared to solely electric drive.
Źródło:
Journal of KONES; 2018, 25, 1; 143-150
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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