scholarly journals Vehicle design – Influence on operational quality

2021 ◽  
Author(s):  
Bernhard Rüger
Keyword(s):  
Significant Influence ◽  
Dwell Time ◽  
Capacity Utilization ◽  
Vehicle Design ◽  
Good Design ◽  
Intensive Research ◽  
Exchange Time ◽  
Rail Vehicles ◽  
Operational Quality ◽  
Passenger Trains

The design of rail vehicles, in particular the boarding area and the interior, has a significant influence on the passenger exchange time. The vehicle design is overlaid with passenger-specific characteristics such as age, mobility restrictions and, in particular, baggage. Poorly designed vehicle layouts mean that some of the seats cannot be used and the degree of capacity utilization achievable and thus customer comfort are noticeably reduced. In particular, however, poorly designed vehicles significantly prolong passenger exchange times, which leads to frequent delays and thus to a decline in operating quality. Based on almost twenty years of intensive research in the field of passenger behaviour in passenger trains, the technical paper will show clear approaches to solutions, how a good design of rail vehicles can increase the degree of utilisation and at the same time the customer comfort, how the passenger exchange time and thus the dwell time can be significantly reduced and thus the operational quality can be significantly increased in addition to other important advantages

scholarly journals Dwell Time Modelling and Optimized Simulations for Crowded Rail Transit Lines Based on Train Capacity

2015 ◽  
Vol 27 (2) ◽  
pp. 125-135 ◽  
Author(s):  
Zhibin Jiang ◽  
Chao Xie ◽  
Tingting Ji ◽  
Xiaolei Zou
Keyword(s):  
Dwell Time ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Transit Systems ◽  
Time Simulation ◽  
Urban Rail ◽  
Micro Simulation ◽  
Potential Benefits ◽  
Passenger Trains ◽  
First Time

Understanding the nature of rail transit dwell time has potential benefits for both the users and the operators. Crowded passenger trains cause longer dwell times and may prevent some passengers from boarding the first available train that arrives. Actual dwell time and the process of passenger alighting and boarding are interdependent through the sequence of train stops and propagated delays. A comprehensive and feasible dwell time simulation model was developed and optimized to address the problems associated with scheduled timetables. The paper introduces the factors that affect dwell time in urban rail transit systems, including train headway, the process and number of passengers alighting and boarding the train, and the inability of train doors to properly close the first time because of overcrowded vehicles. Finally, based on a time-driven micro-simulation system, Shanghai rail transit Line 8 is used as an example to quantify the feasibility of scheduled dwell times for different stations, directions of travel and time periods, and a proposed dwell time during peak hours in several crowded stations is presented according to the simulation results.

The development of an integrated suspension control technology for passenger trains

1998 ◽  
Vol 212 (1) ◽  
pp. 33-42 ◽  
Author(s):  
A Stribersky ◽  
H Müller ◽  
B Rath
Keyword(s):  
Computer Simulation ◽  
Active Suspension ◽  
Active Damping ◽  
Control Technology ◽  
Car Body ◽  
Rail Vehicles ◽  
Hardware Development ◽  
Suspension Control ◽  
Passenger Trains ◽  
Lateral Positioning

In recent years there has been a growing demand for electronically controlled suspensions in rail vehicles. Active car body tilting as well as active or semi-active suspension control have been implemented successfully by industry. This paper describes the development of a suspension control technology which integrates active tilting, active lateral positioning and semi-active damping of a rail vehicle's car body. The focus is on computer simulation as well as on hardware development.

The Influence of Acceleration Performance on Throughput and Trip Time of Passenger Trains in High Density Corridors

2000 ◽  
Author(s):  
Philip M. Strong
Keyword(s):  
Significant Influence ◽  
High Density ◽  
Maximum Speed ◽  
Tractive Effort ◽  
Trip Time ◽  
Passenger Trains ◽  
Time In Service

Abstract Studies continue to indicate that acceleration performance has a significant influence on limiting throughput (maximum number of trains per hour per track) and trip time, in service with high density and/or close station spacing. This paper investigates the influence of horsepower per ton, tractive effort per lb., and maximum speed on throughput and trip time. The paper presents a methodology which can be used to determine performance (throughput and trip time) as functions of horsepower per ton, tractive effort per lb. and maximum speed. Results are presented, using this methodology, which represent a range of typical operations. Limits on available adhesion, and on practical limits on horsepower per ton achievable with today’s technology and infrastructure, are recognized in the examples.

Simulation Analysis of Influences of Anti-Roll Torsion Bar on Vehicle Dynamics

2013 ◽  
Vol 409-410 ◽  
pp. 1486-1491
Author(s):  
Zhuo Yu He
Keyword(s):  
Vehicle Dynamics ◽  
High Speed ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Rail Vehicles ◽  
Urban Rail ◽  
Passenger Trains ◽  
Secondary Suspension ◽  
Dynamics Models ◽  
Torsion Bar

In the secondary suspension of urban rail vehicles and high-speed passenger trains, combination of air springs and anti-roll torsion bar is widely used. However, in its practical use, cracks appear in the anti-roll torsion bar and vehicle curve performance is lower. Through analysis of anti-roll torsion bar, acceleration being taken into account, the dynamics models of anti-roll torsion bar and the vehicle itself are established. The results indicate that the combination of anti-roll torsion bar and rubber joints is superior to present a more reasonable anti-roll stiffness, to ensure better dynamic performance of the train, and also to lengthen the life of the anti-roll torsion bar.

Development of Crash Energy Management for Light Rail Vehicles

2007 ◽  
Author(s):  
Steven W. Kirkpatrick ◽  
Robert A. MacNeill ◽  
Glenn Gough ◽  
Emil Hice
Keyword(s):  
United States ◽  
Energy Management ◽  
The United States ◽  
Vehicle Design ◽  
Light Rail ◽  
Transit System ◽  
Rail Vehicle ◽  
Design Methodologies ◽  
Rail Vehicles ◽  
Rail Industry

Rail vehicle safety standards for the United States have historically placed emphasis on static structural strength requirements to ensure safety. The primary requirements to ensure crash safety of light rail vehicles were static load cases including car body buff loads, collision post loads, corner post loads, etc. More recent developments for light rail vehicles in the United States have included crash energy management design methodologies. This is consistent with the trend in other modes of transportation applying modern crashworthiness engineering. The challenges of incorporating crash energy management into light rail vehicles are the lack of crashworthiness standards for the light rail industry, the introduction of new design methodologies, and the concerns of compatibility of new and older equipment. This issue of compatibility in vehicle designs would often inhibit introduction of innovations and potential safety improvements within an existing light rail transit system. However, there are ongoing efforts to address each of these challenges. The American Society of Mechanical Engineers has a committee working on the development of a new safety standard for light rail vehicles. Light rail vehicle manufacturers are increasingly using modern crashworthiness design principles. In addition, modern crash analysis methodologies allow for the assessment of vehicle incompatibilities in the design process. In this paper, the developments of crash energy management strategies in the light rail industry are discussed. These include the ongoing standards development efforts and the application of crash energy management principles in recent light rail vehicle design efforts. Examples will be provided for the use of crash analyses in a vehicle design. The interaction of the crash and static analyses will be discussed and examples of both compatible and incompatible collision scenarios will be presented.

Perception of Autonomy and Connectedness Prior to the Onset of Anorexia Nervosa and Bulimia Nervosa

2012 ◽  
Vol 40 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Julia Huemer ◽  
Maria Haidvogl ◽  
Fritz Mattejat ◽  
Gudrun Wagner ◽  
Gerald Nobis ◽  
...  
Keyword(s):  
Anorexia Nervosa ◽  
Risk Factor ◽  
Bulimia Nervosa ◽  
Family Environment ◽  
Significant Influence ◽  
Diagnostic Interview ◽  
Individual Autonomy ◽  
Mothers And Fathers ◽  
Image Test ◽  
Restrictive Type

Objective: This study examines retrospective correlates of nonshared family environment prior to onset of disease, by means of multiple familial informants, among anorexia and bulimia nervosa patients. Methods: A total of 332 participants was included (anorexia nervosa, restrictive type (AN-R): n = 41 plus families); bulimic patients (anorexia nervosa, binge-purging type; bulimia nervosa: n = 59 plus families). The EATAET Lifetime Diagnostic Interview was used to establish the diagnosis; the Subjective Family Image Test was used to derive emotional connectedness (EC) and individual autonomy (IA). Results: Bulimic and AN-R patients perceived significantly lower EC prior to onset of disease compared to their healthy sisters. Bulimic patients perceived significantly lower EC prior to onset of disease compared to AN-R patients and compared to their mothers and fathers. A low family sum – sister pairs sum comparison – of EC had a significant influence on the risk of developing bulimia nervosa. Contrary to expectations, AN-R patients did not perceive significantly lower levels of IA compared to their sisters, prior to onset of disease. Findings of low IA in currently ill AN-R patients may represent a disease consequence, not a risk factor. Conclusions: Developmental child psychiatrists should direct their attention to disturbances of EC, which may be present prior to the onset of the disease.

Advanced passenger trains

1972 ◽  
Vol 51 (11) ◽  
pp. 392
Author(s):  
Sydney Jones
Keyword(s):  
Passenger Trains

Comparative Labelling and Biokinetic Studies of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn)

1977 ◽  
Vol 16 (01) ◽  
pp. 30-35 ◽  
Author(s):  
N. Agha ◽  
R. B. R. Persson
Keyword(s):  
Complex Formation ◽  
Significant Influence ◽  
Room Temperature ◽  
Ph Value ◽  
Maximum Activity ◽  
Reduction Step ◽  
Labelling Yield ◽  
Different Temperatures ◽  
Kinetics Of

SummaryGelchromatography column scanning has been used to study the fractions of 99mTc-pertechnetate, 99mTcchelate and reduced hydrolyzed 99mTc in preparations of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn). The labelling yield of 99mTc-EDTA(Sn) chelate was as high as 90—95% when 100 μmol EDTA · H4 and 0.5 (Amol SnCl2 was incubated with 10 ml 99mTceluate for 30—60 min at room temperature. The study of the influence of the pH-value on the fraction of 99mTc-EDTA shows that pH 2.8—2.9 gave the best labelling yield. In a comparative study of the labelling kinetics of 99mTc-EDTA(Sn) and 99mTc- DTPA(Sn) at different temperatures (7, 22 and 37°C), no significant influence on the reduction step was found. The rate constant for complex formation, however, increased more rapidly with increased temperature for 99mTc-DTPA(Sn). At room temperature only a few minutes was required to achieve a high labelling yield with 99mTc-DTPA(Sn) whereas about 60 min was required for 99mTc-EDTA(Sn). Comparative biokinetic studies in rabbits showed that the maximum activity in kidneys is achieved after 12 min with 99mTc-EDTA(Sn) but already after 6 min with 99mTc-DTPA(Sn). The long-term disappearance of 99mTc-DTPA(Sn) from the kidneys is about five times faster than that for 99mTc-EDTA(Sn).

Pengaruh Kecerdasan Emosional Dan Kecerdasan Spiritual Pada Kepuasan Kerja Yang Berdampak Terhadap Kinerja Karyawan PT. Madu Baru Bantul, Yogyakarta

2018 ◽  
Vol 26 (1) ◽  
pp. 13-29
Author(s):  
Erlangga Arya Mandala ◽  
Faresti Nurdiana Dihan
Keyword(s):  
Job Satisfaction ◽  
Emotional Intelligence ◽  
Statistical Analysis ◽  
Significant Influence ◽  
Significant Relationship ◽  
Research Method ◽  
Quantitative Method ◽  
Employee Performance ◽  
Spiritual Intelligence ◽  
Employee Job Satisfaction

The Emotional intelligence, spiritual intelligence and job satisfaction to be part of the factors that influence performance. The purpose of this study was to determine the effect of emotional intelligence and spiritual intelligence on the performance through job satisfaction as an intervening variable partially and simultaneously. This study also aimed to determine the effect of emotional intelligence and spiritual intelligence on the performance through job satisfaction as an intervening variable directly and indirectly. This study was conducted to 77 respondents employees of PT. Madu Baru, Yogyakarta. The research method used is quantitative method uses statistical analysis and descriptive. The results of this study are (1) there is a significant effect of emotional intelligence on employee job satisfaction. (2) there is a significant influence of spiritual intelligence on employee job satisfaction. (3) There is a significant relationship between emotional intelligence and spiritual intelligence on job satisfaction. (4) There is a significant relationship between emotional intelligence on employee performance. (5) There is a significant relationship between spiritual intelligence on employee performance. (6) There is a significant relationship between emotional intelligence and spiritual intelligence on employee performance. (7) There is a significant relationship between job satisfaction on employee performance. (8) There is an indirect effect of emotional intelligence on the performance of employees through job satisfaction. (9) There is the indirect influence of spiritual intelligence on the performance of employees through job satisfaction. Keywords: emotional intelligence, spiritual intelligence, job satisfaction and employee performance

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