Effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions

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For this reason, there are desired RTD maximum and minimum values and absolute maximum and minimum. 2 LRT vehicle on superelevated track 51-3 Figure 3. It has an important bearing on construction costs and operating costs and, in combination with superelevation (difference in elevation of the two rails) in the case of train tracks, determines the maximum safe speed of a curve. The minimum railway curve radius is the shortest allowable effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions design radius for railway tracks under a particular set of conditions. e) Tests also show that for passenger comfort:. The rail vehicle was simulated at constant speed on transitions and curves to generate acceleration profiles at a passenger’s seat location. 4 Force diagram of LRT vehicle on superelevated track 3-33 Figure 3. For this purpose, filtering was applied in accordance with EN 12299:, Railway applications – Ride comfort for passengers – Measurement and evaluation.

To this end, a vehicle/slab-track interaction numerical model was developed, which was validated by comparison of effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions the results obtained herein with those of the field tests carried out in this study. Rail Passenger Vehicle Lateral Dynamic Performance Improvement Through Active Control J. •Spirals can also mitigate clearance effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions issues with circulator“end overhang”when entering and leaving sharp curves. 60603 TelephoneFaxWebsite www. Track geometry Tilting trains were originally effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions designed to run faster than conventional non-tilting trains on "existing tracks". A combination of increased vehicle speeds and non-improved railway tracks may have a negative impact on passenger comfort. degrade effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions passenger comfort –Due to increased speeds in curves, the proposed Exceptional values negatively impacted ride comfort where lateral track alignment (irregularities) were poor • Increases in track shifting and effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions peak rail forces were predicted as a result of the Exceptional values • Derailment indices were not significantly affected. transitions Track Geometry Considerations GUIDELINE 18 Spirals: •To enhance ride comfort, include either spirals effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions or compound transition curves at the ends of any curves regardless of whether or not the track is superelevated.

It has an important bearing on constructions costs and operating costs and, in combination with superelevation (difference in elevation of the two rails) in the case of train tracks, determines the maximum safe speed of a curve. Ind (November,1977) Preview Control for Vehicle Lateral Guidance in Highway Automation. The effect of track geometry and vehicle suspension characteristics effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions on passenger comfort were investigated with a six-degree-of-freedom, time domain simulation of the car body dynamics. This study investigates the combined effect of speed and track geometry on vibration discomfort in high-speed trains. The effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions program includes a graphic animation illustrating the geometrical proximity of the subject vehicle to successive wayside objects and to a vehicle in successive relative locations along an adjacent track. Ind (November, 1977) A State-Space Approach to the Synthesis of Random Vertical and Crosslevel Rail Irregularities. The purpose of this paper is therefore to examine the effect of longitudinal vehicle accelerations on passenger safety and comfort.

Ind (February,1977) Effect of Track Geometry and Rail Vehicle Suspension on Passenger Comfort in Curves and Transitions. 3 Example of ratio of Eu to Ea 12-3 Figure 3. energy consumption and passenger comfort by fine control of the acceleration/jerk profile. We transitions therefore review traditional automobile effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions suspension systems and offer comments on the special considerations of suspension systems of extremely low-mass passenger cars.

5 Power to weight ratio (hp/ton) 150 9. Excessive cant may jeopardize safety; lack of cant will not, (except. The situations of minimum clearance effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions for given vehicle and track geometry inputs are highlighted in a report.

Poor ride can lead to low passenger satisfaction, increased track damage and likelihood of derailment. . While all aspects of wheel/rail interaction, which includes wheel/rail profiles, friction, track geometry, and vehicle suspension systems, must be considered (APTA RP-M-010-98 Recommended Practice for Derailment Investigation Reports provides a good guide), this two-part article examines an issue specific to modern rail transit cars. foreword RAILWAY TRACK AND STRUCTURES. cant deficiency effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions limit of 3 inches is overly conservative. d) Note: The prime reason for canting curved track is for passenger comfort, not safety.

. Increasing the acceleration and deceleration of trains within transitions a railway network can improve the performance of the system. , Control (December,1978) Effect of Track Geometry and Rail Vehicle Suspension on Passenger Comfort in Curves and Transitions.

The effects of rail irregularities with various transitions amplitudes and wavelengths on the ride comfort were studied by a comprehensive parametric analysis. Passenger comfort requirements normally will drive the final track geometry design. To evaluate the effect of vibrations on the effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions ride quality and comfort of a passenger vehicle, the Sperling&39;s ride index method is frequently adopted. Active technology can replace the conventional passive solution of the secondary suspension of a rail vehicle in order to maintain good passenger comfort even when vehicle speed is increased and. Conventional passenger trains could operate at 5% to 10% higher curve speeds without affecting passenger comfort or safety. vehicle types interacting with different track alignment faults on a range of curves. The effect of track geometry and vehicle suspension characteristics on passenger comfort were investigated with a six-degree-of-freedom, time domain simulation of the car body dynamics. Passenger effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions comfort effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions has been evaluated by determining the accelerations at effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions front and rear positions of the coaches in the vehicle–track simulations.

The results showed that the risk of RCF depends effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions on the combination of track alignment, curve radius and cant deficiency; but also the vehicle primary suspension characteristics and wheel/rail conicity. Passenger comfort is an important constraint on high-speed operation in curves and transitions. The literature review brings together two separate. Riley When carried to the extreme, today’s emphasis on automobile mass reduction has significant implications for vehicle ride and suspension design. In passenger service, carbody tilt has virtually no effect on wheel/rail forces, but has a substantial effect on passenger comfort. Light Rail Transit Track Geometry iii-3 List of Figures Figure 3.

Rail vehicle-track modeling and simulations, in past many years is developed a long way from its origins as a research tool. Track Buyer’s Guide EDITORIAL OFFICES 20 South Clark Street Suite 1910 Chicago, Ill. The rail vehicle was simulated at constant speed on transitions and curves to generate acceleration profiles at a passenger&39;s seat location. Effect of effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions Track Geometry and Rail Vehicle Suspension on Passenger Comfort in effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions Curves and Transitions J. With a road vehicle, the driver naturally applies the steering alteration in a gradual manner, and the curve is designed to permit that by.

The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions. 3 Length (ftarticulated) of passengers 5 160 Propulsion method Gasoline engine Electric (or diesel-electric) 2. However, the risk of passengers losing their balance and falling is also increased. Areas which have been carefully investigated are:. The desired values are based on passenger comfort, initial construction cost and maintenance effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions considerations.

Active technology effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions can replace the conventional passive solution of the secondary suspension of a rail vehicle in order to maintain good passenger comfort even when vehicle speed is increased and track conditions are inferior. Railway vehicle dynamic models with various levels of complexity are used, with the measured geometry of a section of high-speed effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions track as an input. 5 Superelevation transitions for reverse curves 53. The effect of track geometry and vehicle suspension characteristics on passenger comfort were.

This paper presents an overview of the current features and. response to track geometry variations – effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions Suspension elements operating at performance limits • Increase in net steady stated carbody lateral acceleration – Decreased passenger ride comfort – Tilt can be used at high cant deficiency to reduce the net lateral acceleration acting on the passengers Effect of CD on Vehicle Performance. This paper focuses on the feasibility of improving the ride quality and comfort of railway vehicles using semiactive secondary suspension based on magnetorheological fluid dampers. However, it was found at an early stage that permissible train speed effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions and/or passenger comfort effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions could be improved with minor adjustments of the horizontal alignment and cant. Influence of Nonlinear Wheel/Rail Contact Geometry on Stability of Rail Vehicles J.

The assessment of a rail vehicle&39;s dynamic ride effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions is critical to a rail operation for both passenger comfort and safety. a) When a rail passenger vehicle enters a curve, centrifugal force acts on the vehicle and any passengers inside. Continuous measurement of passenger ride comfort and track condition on the VLine network. Passenger Vehicles Passenger Car Light rail vehicle Top speed (mphWeight (tons) 1. This force is proportional to the square of the speed of the vehicle and inversely proportional to the radius of the curve.

If such an easement were not applied, the lateral acceleration of a rail vehicle would change abruptly at one point (the tangent effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions point where the straight track meets the curve), with effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions undesirable effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions results. However, the findings for passenger comfort are equally applicable to conven-tional regional and intercity services. The ride and handling characteristics of an automobile. Movement of Railway vehicle on Rail is a guided movement, different as compared to road.

Vehicles operating with. This system is complex with having many degrees of freedoms making the study of vehicle dynamics a challenging subject from the beginning of industrial transitions revolution. The effects of cant, the rates of change of cant, and the radius of vertical curves are also effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions evaluated although they only have a small effect on vibration discomfort. The main effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions conclusion of this study is that modern rolling stock can negotiate curves effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions at a higher unbalanced superelevation than is recommended in the current AREA formula. 1 Horizontal curve and spiral nomenclature 21-3 Figure 3. Pareto optimisation of bogie suspension components is considered for a 50 degrees of freedom railway vehicle model to reduce wheel/rail contact wear and improve passenger ride comfort. This is particularly relevant to urban rail systems, as they typically effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions feature relatively high acceleration and deceleration.

Effect of track geometry and rail vehicle suspension on passenger comfort in curves and transitions

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