TY - JOUR A1 - Rudnicki, Andrzej T1 - Investigation by Computer Simulation - some aspect of transportation service reliability in urban public transport N2 - Essence of service unreliability on account of irregularity has been given. The reasons of occurance of overcrowded vehicles have been listed. The factor of service unreliability on account of irregularity has been determined. It is probability of the event, that the passenger finds departing vehicle fully filled, i.e. when all places seating and standing are occupied or condition of the travel, which would be not acceptable for passenger. Large dispersion of headways (i.e. irregularity) increases probability of such situations. To calculate the mentioned factor, the computer simulation was used. Both, passenger arrivals and vehicle operation have been modelled as stochastic interacted processes. Distributions of headways and passenger arrivals have been fixed by statistical methods. The >maximal capacity< of a vehicle has been determined. The set of parameters values for simulation runs has been given. The transformed results of computer simulation are series of nomographs for determination of a factor value. They were prepared for many types of trams and city buses, but only one nomograph has been presented. Difficulties in verification of model were discussed. Recommendations for rational utilisation level of public transport means capacity in the condition of randomness of passenger arrivals and disturbances in vehicle operation have been proposed. The other possibilities of service unreliability have been mentioned. General conclusions have been given KW - Öffentlicher Personennahverkehr KW - Zuverlässigkeit KW - Modellierung Y1 - 1997 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4829 ER - TY - JOUR A1 - Kirchheim, Alfred A1 - Rudnicki, Andrzej T1 - Die Darstellung des Fahrgästeflusses im Nahverkehr als ein stochastischer Prozess N2 - Das Eintreffen der Passagiere einer Haltestelle eines öffentlichen Nahverkehrsmittel wird als stochastischer Prozeß beschrieben . Die Ankünfte der Nahverkehrsmittel stellen einen Erneuerungsprozeß dar , wohingegen die Ankünfte der Personen innerhalb einer Erneuerungsperiode als instationärer Poissonprozeß aufgefaßt wird. Über die Intensitätsfunktion liegen Messungen vor. Betrachtet wird die Gesamt- wartezeit der Personen an einer Haltestelle . KW - Öffentlicher Personennahverkehr KW - Wartezeit KW - Stochastisches Modell Y1 - 1997 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4653 ER - TY - CHAP A1 - Adamski, A. A1 - Bryniarska, Z. T1 - Schedule Synchronisation in public Transport by Tabu Search and Genetic Method N2 - This paper concerns schedule synchronization problems in public transit networks. In particular, it consists of three main parts. In the first the subject area is introduced, the terms are defined and framework for optimal synchronization in the form of problem representation and formulation is proposed. The second part is devoted to transfer synchronization problem when passengers changing transit lines at transfer points. The intergrated Tabu Search and Genetic solution method is developed with respect to this specific problem. The third part deals with headways harmonization problem i.e. synchronization of different transit lines schedules on a common segments of routes. For the solution of this problem a new bilevel optimization method is proposed with zones harmonization at the bottom level and co-ordination of zones, by time buffers assigned to timing points, at the upper level. Finally, the synchronization problems are numerically illustrated by real-life examples of the public transport lines in Cracow. KW - Öffentlicher Personennahverkehr KW - Verkehrsnetz KW - Synchronisierung Y1 - 1997 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4146 ER - TY - CHAP A1 - Rudnicki, Andrzej A1 - Wainaina, Simon A1 - Hempel, Lorenz T1 - Optimization of street lane usage N2 - This paper contributes to discussion on introduction of exclusive lane for public transport. Analyses of results have been presented on effectiveness of usage of a 4 - lane and a 6 - lane street with and without an exclusive lane for buses. Two basic sub-models have been applied: - the binary logit model for modal split estimation; it takes into consideration the relation of travel time performed by private cars to public transport, - the polynomial model for predicting link impedance; the real travel time is affected by relation of traffic volume to the design capacity The parameters of both sub-models have been calibrated for the Polish conditions. The relationships are determined between number of person trips and traffic volume of buses/private cars, market share of public transport in motorised trips, average travel time lost in trips, average operation cost. An iterative technique addresses a feedback between the modal split and traffic volumes. Numerical calculations by use of EXCEL and MATLAB were carried out. Typical values of corridor length, occupancy rate of passenger car, design capacity of the bus, access and egress time to and from the parking/bus-stop in urban areas were applied. On the basis of the estimated results, the marginal parameter values: number of people carried at which separated lane for buses is most effective , traffic volume for private cars, traffic volume for buses and share of public transport in trips have been got by consideration of the average travel time lost and operational cost as criteria: Then introduction of street lanes with and without exclusive lane for buses in relation to number of person trips can be optimized. KW - Öffentlicher Personennahverkehr KW - Busspur KW - Transportproblem Y1 - 2003 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-3539 ER - TY - CHAP A1 - Dzwigon, Wieslaw T1 - Qualität im ÖPNV – die Erhöhung und das Erhalten der Frequenz T1 - Qualität im ÖPNV - Die Möglichkeiten der Verbesserung und die optimale Gestaltung N2 - Um die entsprechende Qualität der ÖPNV zu erreichen, sollte man das Verhältnis zwischen der Bedienungsqualität und dem Kostenaufwand analysieren. In den Bedingungen der anwachsenden Konkurenz aus der Seite der PKW und anderen Fuhrunternehmern soll man die Handlungen, die grösste Effektivität gewährleisten, aufnehmen. Es gibt viele Möglichkeiten die diese Qualität verbessern können, wie z.B. steigernde Frequenz der Fahrzeuge, Vergrößerung der Geschwindigkeit, Pünktlichkeit und Regelmäßigkeit, Einführung der Niederfußfahrzeuge und vieles mehr. Ich versuche in meinem Referat die Aspekte zu analysieren, die mit der Frequenz verbunden sind, d.h. die Erhöhung der Frequenz und das Erhalten der konstanten Häufigkeit der Linienbusse. Das Referat umfasst die Modelle und die Beispiele. In Verbindung mit den Untersuchungen, die die Bereitschaft der Bezahlung für die Verbesserung der Qualität betreffen, kann man schon Entscheidungen treffen, die unterschiedlichen Standard der Fahrt bestimmen. KW - Öffentlicher Personennahverkehr KW - Optimierung KW - Kostenanalyse Y1 - 2003 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2968 ER -