Tom 20 (2019): Zeszyt 2 (April 2019)

In this paper the relation between semi-active suspension characteristics and vertical oscillations of the vehicle body on road roughness is analysed. During experimental tests, the damping of semi-active suspension was changed while measuring vehicle's sprung and unsprung mass vertical accelerations, pitch rate, which were transformed into a frequency domain for further analysis. The results of the experimental tests were compared to the simulations using the semi-active dynamic model. Validation has shown that model can be used to analyse the influence of semi-active suspension parameters on vehicle oscillations over the entire range of semiactive suspension settings. The comparison of experimental and theoretical simulation showed that semi-active suspension settings have influence on longitudinal oscillations of the sprung mass and it should be estimated in related researches of modern suspension.

Reliable road traffic state identification systems should be designed to provide accurate traffic state information anywhere and anytime. In this paper we propose a road traffic classification system, based on traffic variables estimated using the second order Divided Difference Kalman Filter (DDKF2). This filter is compared with the Extended Kalman Filter (EKF) using both simulated and real-world dataset of highway traffic. Monte-Carlo simulations indicate that the DDKF2 outperforms the EKF filter in terms of parameters estimation error. The real-word evaluation of the DDKF2 filter in terms of classification rate confirms that this filter is promising for real-world traffic state identification systems.

Due to increasing human population and the number of vehicles, road traffic accident has significant influence on human life and economic development. In the present study, road traffic accident data of three years (2015-2017) were obtained from Hosanna Town Traffic Police Department, and Hosanna Town Transport Authority in Ethiopia. The Global Position System was used to know X, Y coordinates of the accident locations. Global Position System point data and accident data were added to road network data using the ‘Joins and relates’ function in ArcGIS. The results of the study showed a total of 241 Road traffic accidents (RTAs) were occurred in the town from which about 208 victims occurred on people and 33 damaged properties. Based on severity and frequencies of RTAs top nine hot spot areas were identified which requires high attention to protect people and property from damage and loss. Thus, the government and other concerned stakeholders should provide public education and awareness creation to reduce risk of fatalities and property damage due to RTAs in Hosanna town.

This article reviews the transport traceability system for customs goods within the Eurasian Economic Union, which is the automated data system used to control integrity and movement of cargo section of a carrier vehicle by means of satellite navigation system, mobile cellular communication system and satellite communication system. Article is dedicated to the development of a model that simulates functions of transport traceability system for customs goods, which are being transported using the international transit transport corridors, and this model would be also used for assessment of a demand on electronic seals by seal installation stations, and for determination of correspondence between simulated transport route and actual travel time. Simulation model was already used in a test project, where it was integrated into “EVAC Transit” transport traceability system, and it has proven it’s operability and efficiency.

The main purpose of the study is to develop a method based on the modified ant algorithm and demonstrate the applicability of its use for building of optimal cargo delivery routes, taking into account the real (non-stationary) dynamics of highdensity traffic on the urban road network in megacities. Within the framework of the proposed method the simulation of building optimal routes, by the example of Kiev, was carried out. The results of study indicate the possibility of using the method for the solution to the problems of efficient management of the freight transportation routing process in the conditions of real dynamics of traffic flows (dense traffic, traffic jam, emergency situations, etc.).

As highly automated and autonomous vehicles (AVs) become more and more widespread, inducing the change of traffic dynamics, significant changes occur in traditional traffic control. So far, automotive testing has been done mostly in real-world or pure virtual simulation environment. However, this practice is quite obsolete as testing in real traffic conditions can be quite costly, moreover purely simulation based testing might be inadequate for specific goals. Accordingly, a hybrid concept of the Vehicle-inthe-Loop (ViL) was born recently, in accordance with the Hardware-in-the-Loop concept, i.e. in the ViL concept the vehicle is the 'hardware' within the simulation loop. Furthermore, due to the development of software capabilities, a novel approach, the Scenarioin-the-Loop (SciL) concept evolves based on the ViL approach. The paper defines the main purposes and conditions related to implementing ViL and SciL concepts from the perspective of traffic simulation and traffic control.

In recent times, several airlines have commenced the operation of ultra-long-range (ULR) services. Using a mixed methods research approach, this paper examines the aircraft deployment, the target passenger market segments, the aircraft cabin configurations, the flight stage lengths and the available seat kilometres (ASKs) produced on the world’s ten longest air routes. The study found that some airlines are operating ultra-long-range services on a hub-to-hub basis, whilst other airlines are operating these services to open new spoke city markets. The case airlines are targeting the premium and leisure travel market segments. The Boeing 787-9 is the most popular aircraft type for these services followed by the Airbus A380-800 and the Boeing B777-200LR aircraft. Qatar Airways Doha to Auckland service has the longest flight stage length (14,535 kilometres). The other 9 air routes all exceed 13,400 kilometres in length. The greatest number of annual ASKs are produced on the Emirates Dubai to Auckland services (5.09 billion ASKs) and the smallest number of annual ASKs are on the Qantas Airways Perth to London services (2.49 billion ASKs).