2011, volume 12 #1. "Transport and Telecommunication". Журнал издательства TSI, ISSN 1407-6160, ISSN 1407-6179 | TSI

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2011, volume 12 #1. "Transport and Telecommunication". Журнал издательства TSI, ISSN 1407-6160, ISSN 1407-6179

 

PREDISASTER DESIGN OF TRANSPORTATION NETWORK

Ilya Gertsbakh1, Yoseph Shpungin2

1Department of Mathematics,
Ben Gurion University
P.O.Box 653, Beer-Sheva, 84105, Israel
E-mail: elyager@bezeqint.net

2Software Engineering Department,
Shamoon College of Engineering
Beer-Sheva, 84105, Israel
E-mail: yosefs@sce.ac.il

In this paper we consider transportation network optimal reinforcement problem. We mean by that network reliability improvement achieved by reinforcement of a certain number of its most important links (road segments), which are subject to failure (destruction). This reinforcement is made given a budgetary constraint, and its goal is to maximize the global network performance measure, which depends on the source-terminal reliability of a fixed set of origin-destination routes or network all-terminal connectivity. The central role in the proposed optimization is played by a combinatorial Monte-Carlo algorithm for estimating the network s – t reliability or the probability of all-terminal connectivity, and the gradient vector. The proposed optimization method is tested on an example described in [1] of a road network of Istanbul. The link failures are caused by natural disasters like earthquakes, and link e reinforcement means its replacement for a cost c(e) by a more reliable one. Another example is a 4-terminal 34-link with 25 nodes network in which the reinforcement raises the link reliability up to 0.9 and the problem is stated as find the minimal cost reinforcement policy to guarantee the prescribed value of the probability of all terminal connectivity.

Keywords: network Monte Carlo, reliability gradient vector, network design, link failure, earthquakes, ts− network reliability, all-terminal connectivity

UPGRADING THE EFFICIENCY OF AIRSPACE FLIGHT SIMULATORS FOR EMERGENCY-RESPONSE TRAINING OF SPACE CREWMEMBERS

Boris Kuznetsov, Mikhail Serebryakov, Viktor Proshkin, Alexey Bormotov

GOU VPO Penza State Academy of Technology
State Educational Institution for Higher Professional Training
25 Bogdanov Street, apt. 35, Penza 440052, Russia
Phone: +79273927390.
E-mail: bris-AZAZEL@mail.ru

Both the flight safety and space crew efficiency depend for the most part upon the crewmembers’ professional qualities achieved with the aid of different training systems. The inconvenience of such systems consists in their failure to provide an overall simulation of some psycho-physiological sensations experienced by the crewmembers in real space flight conditions, e.g. air sickness, distortion of equilibrium sense, fatigue, apprehension, anxiety, pain sense modality, etc. With regard to the significance of the above component of space crew training a simulator model with improved training efficiency was designed. The multidimensional effects of the simulating system suggested provide facilities for quality improvement in the crewmembers’ training and development of the appropriate decision-making, managerial and other skills essential to the crew in both standard and emergency situations.

Keywords: Flight simulator system, operator, psycho-physiological sensations, emergency situations

COLLECTING DATA BY INTERNET ON STATED PREFERENCE FOR TRANSPORT SUPPLY: THREE CASE STUDIES ON SURVEY MODE COMPARISON

Åse Nossum1, Knut Veisten2

1 Institute of Transport Economics
Gaustadalleen 21, NO-0349 Oslo, Norway
Analyse & Strategi
AS Postboks 12 Skøyen, NO-0212 Oslo, Norway (present address)

2 Institute of Transport Economics
Gaustadalleen 21, NO-0349 Oslo, Norway
Corresponding author: kve@toi.no

Internet-based data has become an important source for market research in the developed world, following the rapidly improving technology and increase in Internet access and use. Given the existence of an acceptable and accessible sampling frame, sampling by the Internet is much cheaper than any other sampling method. A main issue is to which extent use of different survey modes, particularly the Internet, will affect survey results, and if differences are due to different representation of genders, age groups, etc., or due to the survey mode itself. This paper presents recent experiences from the use of Internet-based stated-preference surveys combined with other survey modes, particularly postal mail sampling. Preferences were stated as sequential pair-wise choices between transport options. Comparing models with and without weighting with respect to gender, age and unemployment, we show that there is a significant survey-mode effect on a large share of attribute parameters.

Keywords: pair-wise choices, public transport, sampling bias, time savings

FUZZY MODEL IN FUZZY-TECH ENVIRONMENT FOR THE EVALUATION OF TRANSPORTATION’S QUALITY FOR CARGO ENTERPRISES IN UKRAINE

Oleksandr Dorokhov1, Ludmila Dorokhova2

1Kharkiv National University of Economics
9-a, Lenina str., 61001, Kharkiv, Ukraine
E-mail: aleks.dorokhov@meta.ua

2 National Pharmaceutical University,
53, Pushkinska str., 61002, Kharkov, Ukraine
E-mail: dorohova@meta.ua

The basic criteria of quality vehicle servicing and operation of road transport enterprises in the transportation market of Ukraine have been reviewed, classified, described and structured. Their formalization by linguistic variables with appropriate terms has been done. Usage of methods of fuzzy inference to determine the integral generalized level of freight transportation’s quality has been proposed. Corresponding computer model has been developed in fuzzyTECH – a specialized package of fuzzy modelling

Keywords: transport service, the quality of freight transportation, the criteria for the level of transport service

MEDICAL POINT OF VIEW ON PASSIVE SAFETY

Nikolay Panin

Scientific and Research Institute of Motor Transport NIIAT
Geroyev Panfiloftsev Str. 24, 125480 Moscow, Russian Federation
Phone: +7(495)3292648.
E-mail: pagnini@yandex.ru

Only modern passive car safety systems can protect drivers inside vehicle during accident. In addition, there are other important conditions: the residual post-accident life-space in the car and rapid arrival of ambulance. However today there is a new research path – simulation (by using digitised model of an anthropomorphic dummy). The analysis of human body behaviour during crash can give useful information for designers of the new passive car safety systems.

Keywords: HIC, accelerations, passive car safety systems, residual post-accident life-space

APPLICATION OF A DISCRETE CHOICE MODEL TO ANALYSIS OF PREFERRED TRANSPORT MODE FOR RIGA–DAUGAVPILS ROUTE

Dmitry Pavlyuk1, Vaira Gromule2

1 Candidate of Economic Science,
Transport and Telecommunication Institute
Lomonosova 1, Riga, LV-1019, Latvia
Phone: (+371)29958338.
E-mail: Dmitry.Pavlyuk@tsi.lv

1 „Rīgas Starptautiskā Autoosta” JSC
Prague 1б, Riga, LV-1050 Latvia
Phone: (371) 67503646.
Fax: (+371) 67507009.
E-mail: autoosta@autoosta.lv

This paper is devoted to discrete choice analysis of behaviour of bus and train passengers and their choice between alternative transportation modes. We develop a nested discrete choice model and estimate model parameters on the base of data sample collected in our own survey. We consider Riga-Daugavpils two-way journeys with three possible transportation options – a car, a coach, and a train. Using our survey data we analyse factors, which influence passengers’ choices. A set of factors includes travel specific factors (departure time), factors, which describe passengers’ age, income, etc. and factors, which describe their behaviour (time of arrival to a station before departure). The resulting conclusions of the research have a significant practical utility and have been used to improve operations of Riga International Coach Terminal.

Keywords: discrete choice model, transportation, coaches, railways

MATHEMATICAL MODEL OF A HYDRALIC DRIVE FOR A DYNAMIC TEST STAND

Ivan Proshin, Vladimir Timakov, Evgeny Nazarov, Evgeny Sapunov

GOU VPO Penza State Academy of Technology
State Educational Institution for Higher Professional Training
7 Putevaya Street, apt. 1, Penza 440042, Russia
Phone: +7(8412)581546.
E-mail: proshin@pgta.ru, n.zhenya89@rambler.ru

One of the priority areas in development of science and technology is the flight simulator engineering, and this top target is determined by the pressing necessity to improve the quality of air staff training, to assure flight safety and reliability technologies against the background of cuts in expenditures for aircrew training, instruction and drill. The flight training systems, or flight and equipment simulators, are provided with computing and modelling systems enabling the crew the facilities to acquire and reinforce the skills of aircraft handling, flight control, air navigation, and aircraft equipment service. The military aircraft pilots are given the opportunity to use the simulators for operational flight training. An integrated flight simulator is a complex of interrelated components designed for regular aircrew training regardless of meteorological condition, availability and operational status of the aircraft make and model, and with no reference to the air conditions and air-traffic restrictions. It is particularly important that flight simulators provide safe ground conditions for aircrew emergency-response training with due consideration of possible high sustained G-loads and complex aircraft movements. A dynamic test stand is a basic element of the flight simulator intended to develop the acceleration effects similar to those experienced by a person operating, in live environment, a moving vehicle (an aircraft, a tank, etc.)

Keywords: flight simulator, dynamic test stand, hydraulic drive, mathematical model

MATHEMATICAL MODELLING OF CONTROL LAWS BY DYNAMIC TEST STAND OF FLIGHT SIMULATOR

Ivan Proshin, Vladimir Timakov, Sergey Nikitashin, A. Savelyev

GOU VPO Penza State Academy of Technology
State Educational Institution for Professional Training
7 Putevaya Street, apt.1, Penza 440022, Russia
Phone: +7(412)581546; +7(412)496159.
E-mail: proshin@pgta.ru; Serg040189@mail.ru

Flight simulator dynamic test stands intended for flight crew training are considered in this paper, with the focus of particular interest being on the improvement of the dynamic test stands. The practical value of the project results from the significant quality improvement in the control of the real-life flight simulators based on the research results applied. The high efficiency of the project has been proved by both application of the research results to the flight training and the experimental investigation of the new system in the working environment. The originality of the project is determined by the system suggested for control of the hydraulic drive with static load compensation as well as by the hydraulic drive models and the control laws developed. Due to the developments mentioned the accuracy of the response to the control input signal is improved and the loads created in the test stand are approximated to the real-life loads. As a primary result of the investigation a simulated model has been developed and control laws have been improved for the flight simulator dynamic test stands. The research findings prove to be of major scientific and practical interest and can be recommended for application in the flight simulator control systems.

Keywords: flight simulator, gradient, dynamic test stand, G-load, acceleration data

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