Analysis of dynamic properties of the PRT vehicle-track system

Kozłowski, Maciej; Choromański, W.; Kowara, J.

doi:10.1515/bpasts-2015-0091

Cited by 8 publications

(11 citation statements)

References 6 publications

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“…However, it should be noted that the project goal never was to deploy a specific system, but only to perform scientific and research activity. In the part pertaining to PRT, the project's results were discussed in papers [26,27]. A physical model of a vehicle/guideway/control system setup was developed to a scale of 1:4 along with a 1:1 physical model of the vehicle cabin, and a unique PRT network simulator was created.…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamics of a scaled PRT (personal rapid transit) vehicle

Kozłowski¹

2019

J. vibroeng.

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This publication provides a discussion concerning research aimed to analyse running properties of PRT vehicles. A PRT vehicle is guideway vehicle equipped with rubber-tyred wheels, running on a flat subgrade guideway of special design. The guideway cross-section is similar to that of a C-shaped beam with two outer limiting edges. This specific design characteristic of the running system of PRT vehicles distinguishes them from typical rail vehicles, where the latter can move along the track by the action of a unit referred to as the centring mechanism, operating at the contact of profiled wheels with the running rail head. In a PRT vehicle, the typical railway centring mechanism has been removed and substituted with a system of outer and inner rollers, forming what is referred to as a passive switch system, responsible for carrying the vehicle along the guideway and within the boundaries delimited by its edges by the action of the rollers' contact forces. Compared to railway infrastructure, this system is characterised by different dynamic properties, and it has not been sufficiently researched yet. The goal of this article is to analyse motion stability of a PRT vehicle with a passive switch system and having the following structural features: wheel sets with beams turning against the vehicle body and independently revolving wheels, non-turning rubber-tyred and non-profiled wheels rolling on a flat surface, and a set of outer and inner rollers performing the passive switch system's functions. The paper describes a PRT vehicle simulation model. It has been assumed that the model's design and parameters describe a scaled vehicle/guideway system whose physical model is actually set at a laboratory testing station on premises of the Warsaw University of Technology. The article provides results of simulation studies of motion stability pertaining to the following characteristics: radial positioning, yawing, sticking to the guideway edge, self-excited vibrations of wheel sets as well as free vibrations. It also discusses results of an analysis of sensitivity of the model's parameters against selected control parameters (model's design parameters) and assessment indicators which describe the intensity of the yaw type torsional vibrations of wheel sets. The article closes with a discussion on the potential to use the results of the tests conducted under the study on the scaled vehicles in question for purposes of vehicles of real-life dimensions.

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Section: Introductionmentioning

confidence: 99%

Analysis of dynamics of a scaled PRT (personal rapid transit) vehicle

Kozłowski¹

2019

J. vibroeng.

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“…Nowadays many of monitoring system allow observing of functionality and parameters of different elements [33][34][35][36][37][38][39][40].…”

Section: Discussionmentioning

confidence: 99%

Influence of Production Process and Material Factors on Fatigue Strength of Tubular Stabilizer Bar / Wpływ Procesu Produkcyjnego I Czynników Materiałowych Na Wytrzymałość Zmęczeniową Stabilizatora Rurowego

Wittek

Burdzik

Folęga

et al. 2015

Archives of Metallurgy and Materials

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The paper presented results of the research on process of production of highly important element of passenger car. The main object of the research was influence of production process and material factors on fatigue strength of tubular stabilizer bar. The scope of the research included the stabilizer bar hot bent at the bending table, hardened in oil and tempered. The bending radii I, II and III were metalographically tested. The stabilizer bar was also subjected to fatigue tests. For analysis purpose the finite element method (FEM) calculation have been conducted. The analysis of relationship of outer diameter to wall thickness is very important. The analysed bar has broken early. The paper presents the reasons for premature failure of the tubular stabilizer bar.

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“…2 (Kozłowski et al 2015a). The vehicle is driven along the track using contact forces (roll-track edge) produced by the roll system.…”

Section: Mechanical Systemmentioning

confidence: 99%

“…The direction of movement is selected by lifting-lowering specific outer rolls (this solution is called passive swtch in rail vehicles and it distinguishes this vehicle from classic rail vehicles). The analysis of the properties of this type of vehicles is a separate scientific issue (Kozłowski et al 2015a(Kozłowski et al , 2015b. In this paper, the results of research work on determining the traction energy of PRT vehicle in real size are presented.…”

Section: Introductionmentioning

confidence: 99%

Simulation method for determining traction power of ATN–PRT vehicle

Kozłowski

2016

Transport

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Abstract. The construction of Personal Rapid Transit (PRT) vehicle made within the framework of Eco-Mobility project has been described in the present paper. Key features of the vehicles were identified -e.g. drive with three-phase linear motor with winding on the vehicle and fixed rotor in the road surface, contactless dynamic vehicle powering. Attention was paid to the difference in dynamic properties compared to rail vehicles, related to the lack of the so-called 'centering mechanism' . A development of a nominal model for the analysis of vehicle drive properties was presented.Results of simulation studies were presented for a vehicle with running-drive system construction, planned for implementation in the city of Rzeszów (Poland). While discussing the problems of building a PRT system, there was a focus on the issue of determining power and traction of the vehicle. A methodology for determining the power and traction energy consumption of the vehicle was presented for assumed conditions of travel on road segments. Input values for the calculation of power are variables describing the curvature (or bends radii) of paths of movement between stops and the course of the current speed. Output values are total traction power or traction energy (where 'traction' refers to the power or mechanical work of drive forces). Three basic elements of traction power were isolated: the power of kinetic energy (for acceleration/delay of vehicle movement) basic (to offset the aerodynamic force of motion resistance at constant speed) and additional losses (to offset additional motion resistance forces operating in turns at constant speed). Due to the lack of vehicle prototypes with assumed structure, it was proposed that these components are determined via simulation. The presented results relate to the calculation of demand for power and energy for the planned test section. The scope of further work was indicated: determining the required traction characteristics of electric drive, selecting the best values for supercapacitor's capacity in the drive system, determining the technical parameters of substation.

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Analysis of dynamic properties of the PRT vehicle-track system

Cited by 8 publications

References 6 publications

Analysis of dynamics of a scaled PRT (personal rapid transit) vehicle

Analysis of dynamics of a scaled PRT (personal rapid transit) vehicle

Influence of Production Process and Material Factors on Fatigue Strength of Tubular Stabilizer Bar / Wpływ Procesu Produkcyjnego I Czynników Materiałowych Na Wytrzymałość Zmęczeniową Stabilizatora Rurowego

Simulation method for determining traction power of ATN–PRT vehicle

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