An evolutionary approach to active suspension design of rail vehicles

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.

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Active Suspension Systems for Rail Vehicles

Vehicle System Dynamics ◽

10.1080/00423117708968542 ◽

1977 ◽

Vol 6 (2-3) ◽

pp. 206-206

Author(s):

ALAN FIEN

Keyword(s):

Active Suspension ◽

Suspension Systems ◽

Rail Vehicles ◽

Active Suspension Systems

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Improved Curving Performance for Two-Axle Rail Vehicles With Actuated Solid Wheelsets Using H∞ Control

2016 Joint Rail Conference ◽

10.1115/jrc2016-5775 ◽

2016 ◽

Cited By ~ 1

Author(s):

Alireza Qazizadeh ◽

Sebastian Stichel

Keyword(s):

Vehicle Dynamics ◽

Wear Behavior ◽

Active Suspension ◽

Wheel Wear ◽

Passenger Vehicles ◽

Rail Vehicle ◽

Rail Vehicles ◽

Rail Wear ◽

Rail Vehicle Dynamics ◽

Curving Performance

Application of active suspension on passenger vehicles has engaged many vehicle dynamics specialists in recent years. The technology can be used for different purposes including improving comfort, stability or wear behavior. Despite these benefits, industries do not yet find these technologies attractive enough. One reason is that the achieved benefits do not pay back for itself since the vehicle will become more expensive. Therefore, more steps should be taken to make active suspension attractive. One such a step can be using active suspension for resolving classical limitations in rail vehicle dynamics. An example of this is a non-bogie rail vehicle with two axles. One of the problems associated with these vehicles is their short axle distance limiting the length of the vehicle. The short axle distance is partly for limiting wheel-rail wear. This paper describes how to reduce wheel wear through achieving better wheelset steering in curves so that longer axle distances can be allowed. Wheelset steering is performed by H∞ control strategy.

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Proposal for systematic studies of active suspension failures in rail vehicles

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1177/0954409716663583 ◽

2016 ◽

Vol 232 (1) ◽

pp. 199-213 ◽

Cited By ~ 3

Author(s):

Alireza Qazizadeh ◽

Sebastian Stichel ◽

Rickard Persson

Keyword(s):

High Speed ◽

Failure Modes ◽

Ride Comfort ◽

Fault Tree Analysis ◽

Active Suspension ◽

Vehicle Safety ◽

Active Suspensions ◽

Analysis Techniques ◽

Rail Vehicle ◽

Rail Vehicles

Application of active suspensions in high-speed passenger trains is gradually getting more and more common. Active suspensions are primarily aimed at improving ride comfort, wear or stability. Failure of these systems may not only just deteriorate the performance but it may also put vehicle safety at risk. There are not many studies that explain how a thorough study proving safety of active suspension should be performed. Therefore, initiating this type of study is necessary for not only preventing incidences but also for assuring acceptance of active suspension by rail vehicle operators and authorities. This study proposes a flowchart for systematic studies of active suspension failures in rail vehicles. The flowchart steps are solidified by using failure mode and effects analysis and fault tree analysis techniques and also acceptance criteria from the EN14363 standard. Furthermore, six failure modes are introduced which are very general and their use can be extended to other studies of active suspension failure. In the last section of the paper, the proposed flowchart is put into practice through four failure examples of active vertical suspension.

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Cognitive gadgets: A provocative but flawed manifesto

Behavioral and Brain Sciences ◽

10.1017/s0140525x19001134 ◽

2019 ◽

Vol 42 ◽

Cited By ~ 2

Author(s):

Marco Del Giudice

Keyword(s):

Theory Of Mind ◽

Cultural Differences ◽

Twin Studies ◽

Cross Cultural ◽

Evolutionary Approach ◽

Genetic Inheritance ◽

Double Standards ◽

Cross Cultural Differences ◽

Cherry Picking ◽

Dichotomous Thinking

Abstract The argument against innatism at the heart of Cognitive Gadgets is provocative but premature, and is vitiated by dichotomous thinking, interpretive double standards, and evidence cherry-picking. I illustrate my criticism by addressing the heritability of imitation and mindreading, the relevance of twin studies, and the meaning of cross-cultural differences in theory of mind development. Reaching an integrative understanding of genetic inheritance, plasticity, and learning is a formidable task that demands a more nuanced evolutionary approach.

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