Investigating the feasibility of a new testing method for GFRP/polymer foam sandwich composites used in railway passenger vehicles

2020 ◽  
Vol 233 ◽  
pp. 111576 ◽  
Author(s):  
Asım Önder ◽  
Mark Robinson
Keyword(s):  
Sandwich Composites ◽  
Polymer Foam ◽  
Passenger Vehicles ◽  
Testing Method ◽  
Railway Passenger

scholarly journals Labyrinth structure sealing performance on grounding device of railway passenger vehicles

2019 ◽  
Vol 612 ◽  
pp. 032199
Author(s):  
Gang Li ◽  
Xiangli Lin ◽  
Yingying Liu ◽  
Lun Li ◽  
Qingshan Liu ◽  
...  
Keyword(s):  
Passenger Vehicles ◽  
Sealing Performance ◽  
Railway Passenger

scholarly journals Methodology for calculation of minimum transfer time in the transport hub

2018 ◽  
Vol 235 ◽  
pp. 00015 ◽  
Author(s):  
Martin Vojtek ◽  
Tomas Skrucany ◽  
Martin Kendra ◽  
Jan Ponicky
Keyword(s):  
Point Of View ◽  
Transfer Time ◽  
Passenger Transport ◽  
Or Education ◽  
Passenger Vehicles ◽  
Main Requirement ◽  
Passenger Transportation ◽  
Railway Passenger Transport ◽  
Passenger Trains ◽  
Railway Passenger

The most important element in railway passenger transport is a customer – traveller, who requires the transport from one place to another. A basic precondition for accomplishing the main requirement – transport, is making the complete offer which provides not only transport, but also other associated services. Practically, there are many associated criteria of transport, for example safety, duration, price, reliability, comfort and complementary services. Passenger transport is generally considered as an activity, which arises as the consequence of spatial division of places, where people are in exact time and their need to move. Motivators for moving could be commuting – job or education, dealing with personal or working matters, travelling for vacation – hiking, sport, health, cultural and social facilities, visiting relatives and friends. Requirements for transport of passengers originate in the need to move, while the passenger transport is dependent on the willingness of travelling. In passenger transport, there are mostly individual passengers, so it is difficult to determine all transport requirements. The paper is focused on one of the key factors of passenger transportation - connectivity of trains. Connectivity of passenger trains and other means of transport can be distinguished also from temporal and spatial point of view. Temporal connectivity is such sequence of arrivals and departures of different passenger trains and other means of transport, which allows changing the different passenger vehicles easily in regard to necessary time. Spatial connectivity means the distance between two passenger vehicles, among which the passenger is moving. In the paper, there is described the general methodology for calculation of minimum transfer time in the railway station. Railway passenger station is some kind of transport hub – a starting and finishing point for flows of passengers. Passengers have the opportunity to change the train type from long-haul train to regional train or contrariwise or simply enter or leave the system of railway transport. In the methodology, all necessary aspects are taken into account.

On the optimal design of railway passenger vehicles

2001 ◽  
Vol 215 (2) ◽  
pp. 111-124 ◽  
Author(s):  
G. R. M. Mastinu ◽  
M Gobbi
Keyword(s):  
Optimal Design ◽  
Life Cycle Cost ◽  
Ride Comfort ◽  
Concept Design ◽  
Vehicle Performance ◽  
Passenger Vehicles ◽  
Performance Indexes ◽  
Maximum Payload ◽  
Railway Passenger ◽  
The Many

A method is presented for the concept design of railway passenger vehicles. The method requires adequate mathematical modelling for describing quantitatively the many relationships between vehicle parameters and vehicle performance indexes. The main purpose of the method is defining the layout of vehicles (i.e. length, number of wheelsets, etc.) in order to obtain the lowest possible life cycle cost (LCC). The method is based on multiobjective programming (MOP), a branch of operations research. By the proposed method, the optimal design of railway passenger vehicles can be performed in a theoretically correct and rigorous way. Genetic algorithms (GAs) are used to find the numerical solution to the problem. The optimal design of urban, suburban and intercity (IC) passenger vehicles is performed in order to obtain the best compromise between conflicting requirements such as maximum payload, minimum tare weight and axle load, minimum track deterioration, maximum ride comfort, etc. It is shown that, with respect to modern vehicles, a major improvement in LCC would be gained if shorter vehicles and newly designed wheelsets and/or bogies could be adopted. Should this happen, new families of passenger vehicles with two or three axles would be the optimal solutions to be built.

THE MODELLING OF RAILWAY PASSENGER VEHICLES

1992 ◽  
Vol 20 (sup1) ◽  
pp. 144-156
Author(s):  
J. R. Evans
Keyword(s):  
Passenger Vehicles ◽  
Railway Passenger

Interfacial delamination in glass-fiber/polymer-foam-core sandwich composites using singlemode–multimode–singlemode optical fiber sensors: Identification based on experimental investigation

2017 ◽  
Vol 22 (1) ◽  
pp. 40-54 ◽  
Author(s):  
Nilanjan Mitra ◽  
Alak K. Patra ◽  
Satya P Singh ◽  
Shyamal Mondal ◽  
Prasanta K Datta ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Side Surface ◽  
Cost Effective ◽  
Fiber Optic Sensor ◽  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Composites ◽  
Strain Sensing ◽  
Polymer Foam ◽  
Interfacial Delamination

Identification of interfacial delamination in the glass fiber/polymer-foam-core sandwich composites is difficult if the delamination does not propagate to the side surface of the specimen. However, these damages may eventually lead to compromising the sandwich composite structural component. A cost-effective novel embedded fiber optic sensor is being proposed in this manuscript, which works on the principle of multimode interference, to perform distributed sensing of interfacial delamination within the sandwich composites while in service. Even though this easy to use methodology has been used to identify interfacial delamination, this methodology can also be used for different other types of interfacial/interlaminar distributed strain sensing of samples under mechanical as well as thermal loads.

scholarly journals Influences of car body vertical flexibility on ride quality of passenger railway vehicles

2009 ◽  
Vol 223 (5) ◽  
pp. 461-471 ◽  
Author(s):  
J Zhou ◽  
R Goodall ◽  
L Ren ◽  
H Zhang
Keyword(s):  
Flexural Vibration ◽  
Ride Quality ◽  
Resonant Vibration ◽  
Structural Damping ◽  
Natural Vibrations ◽  
Vertical Stiffness ◽  
Passenger Vehicles ◽  
Railway Passenger ◽  
Geometric Filtering

To study the influences of carbody vertical stiffness on vehicle ride quality, a vertical model of railway passenger vehicles, which includes the carbody flexible effects and all vertical rigid modes, is built. With the model and the covariance method, the requirements for the carbody bending frequency are researched. The results show that when the stiffness of a carbody decreases to certain frequencies there are significant vibrations in the carbody, although structural damping provided by a fully equipped carbody will help attenuate the vibration to some extent. A simple way to avoid resonant vibration is to increase the bending frequencies of a carbody: the higher the vehicle running speed, the higher carbody stiffness could be required. However, there are practical limitations to such an increase and the method used in this study can readily obtain the lowest bending frequency required by vehicle ride quality. Finally, the geometric filtering phenomenon and its influences on the carbody resonant flexural vibration are analysed. Results show that it is this phenomenon rather than the natural vibrations of bogie bounce that most strongly influences the resonant flexural vibration of a railway carbody.

Acoustic Aspects of Railway Vehicle Design

1976 ◽  
Vol 190 (1) ◽  
pp. 515-525 ◽  
Author(s):  
P. W. Eade ◽  
C. G. Stanworth
Keyword(s):  
Internal Noise ◽  
Analytical Techniques ◽  
Railway Vehicle ◽  
Vehicle Design ◽  
Acoustic Environment ◽  
Passenger Vehicles ◽  
Railway Passenger

SYNOPSIS The paper describes the present acoustic environment in railway passenger vehicles, and discusses the various mechanisms leading to this. The factors providing a basis for an internal noise criterion are stated, and suitable criteria for different classes of stock suggested. A more detailed discussion is presented of various problems encountered during investigation, and of the experiments and analytical techniques evolved during their solution. It is pointed out where the experience gained in this work can be applied, and also where gaps still remain to be filled by future investigation.

scholarly journals Analyses of Deformation in Viscoelastic Sandwich Composites Subject to Moisture Diffusion

2008 ◽  
Author(s):  
Nikhil P. Joshi ◽  
Anastasia H. Muliana
Keyword(s):  
Dimensional Stability ◽  
Structural Characteristics ◽  
High Strength ◽  
Moisture Diffusion ◽  
Peel Strength ◽  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Composites ◽  
Polymer Foam ◽  
Effect Of Moisture

Sandwich composites with polymer foam core are currently used in load-bearing components in buildings and naval structures due to their high strength to weight and stiffness to weight ratios, excellent thermal insulation, and ease of manufacturing. During their service time, sandwich composites are exposed to various external mechanical and hygro-thermal stimuli. It is known that the constituent properties of the sandwich composites are greatly influenced by the temperature and moisture fields. Granville [1] conducted experiments to study the effect of moisture on structural, dimensional stability, weight gain and peel strength of sandwich composites. Morganti et al. [2] analyzed the effect of moisture on the dimensional stability of the sandwich composites and concluded that moisture affects the physical behavior of the composite directly by modifying its structural characteristics such as matrix degradation and microcracks between fiber and matrix etc. However, the effect of moisture on the deformations in the sandwich composite with the viscoelastic foam cores has not yet been studied. The time-dependent response of the sandwich composite (due to the viscoelastic foam core) is aggravated in the moist environment conditions. Thus, it becomes necessary to analyze the effect of moisture on the overall response of the sandwich composites.

Interfacial delamination crack profile estimation in polymer foam-cored sandwich composites

2019 ◽  
Vol 189 ◽  
pp. 635-643 ◽  
Author(s):  
Nilanjan Mitra ◽  
AlakKumar Patra ◽  
Shyamal Mondal ◽  
Prasanta Kumar Datta
Keyword(s):  
Sandwich Composites ◽  
Polymer Foam ◽  
Delamination Crack ◽  
Interfacial Delamination ◽  
Profile Estimation ◽  
Crack Profile
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