control system design of a semi-active anti-roll bar

8/3/2019 Control System Design of a Semi-Active Anti-roll Bar

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CONTROL SYSTEM DESIGN OF A SEMI-ACTIVE ANTI-ROLL BAR TILT SYSTEM FOR

RAILWAY VEHICLE


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I n r a i l w a y v e h i c l e t h e r e a r e t h r e e p r i n c i p l e a r e a s o f a p p l i c a t i o n o f a c t i v e / s e m i s u s p e n s i o n :

1 . C a r b o d y a c t i v e t i l t i n g s y s t e m

t o i m p r o v e r i d e c o m f o r t i n c u r v e b y r e d u c i n g l a t e r a l

a c c .

- L e a n t h e v e h i c l e i n w a r d o n c u r v e s t o r e d u c ea c c e l e r a t i o n f e l t b y t h e p a s s e n g e r s


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2. Active Secondary suspension system

to improve vehicle response to track irregularities

3. Active Primary suspension system

to improve stability & guidance

- reduce hunting phenomenon (wheel/rail geom.)

this research will concentrate on active/semi-activetilting system

Hunting phenomenon in curve track


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Problem statement

- Modern R.V with active tilting use either

some form of inclined links or roller bolster toprovided the tilting action require manyadditional components, which will increaseweight & mechanical complexity.

- The traditional R.V have anti-roll torsion

bar to reduce roll effect during negotiatingin curve

- The idea of this research is to modify thispassive system by adding controllable(active) elements to the anti-roll bar

assembly, which can be used to tilt thevehicle body in order to reduce theacceleration during curves


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Anti-roll bar


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Research Objectives

The fundamental objective of this research is to develop active anti-rolltitling system for railway vehicle. The objectives of this research can besummarized as follows:

To develop a detailed computer model of railway vehicle forcomputational modeling focusing on the lateral and roll dynamics.

To develop control strategy for the active anti-roll tilting system

To test and validate the active anti-roll tilting system experimentallyon scaled railway vehicle model on roller test rig and real railwayvehicle.


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Literature Review

Literature study on established researches of railway vehicle dynamics will

be conducted. Recent development on railway vehicle computationalmodeling and active/ semi-active suspension system to be implemented foractive tilting system of railway vehicle will also be reviewed.

Mathematical Model Formulation

In this stage the formulation for dynamic modeling of railway vehicle will beformulate.

Data Collection & Measurement of Railway Vehicle DynamicsParameters

Dynamic parameters such as weight, size, wheelset geometry, rail geometryand components location on a railway vehicle system will be measured andrecorded will be used as input parameters for computer simulation inADAMS/Rail. The KTMB railway vehicle will be used as a reference model.


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Development of railway vehicle model for Multibody DynamicAnalysis

The complex model of railway vehicle using computational multibody dynamicwill be developed based on parametric measurement of dynamic parameters ofthe KTMB railway vehicle. The theory of wheel-rail interaction will be applied.The development of the model will be focused on fully nonlinearity formulationand computational algorithms.

Development of Control Strategy for anti-roll bar tilting system

The appropriate control structure will be develop using computer simulation.The best control strategies from the simulation result will then be implemented

and tested on the roller test rig using scaled model of railway vehicle.


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Model Testing & Experiment on Scaled Model of Railway Vehicle onTest Rig

The developed model will be tested on the roller test rig for passive and

active/semi-active anti-roll bar tilting system with varying vehicle speed andlateral displacement of the wheel-track. Responses of the passive system will beused as a benchmark.

Analysis and Comparison

The data obtained from experimental will be compared with thetheory/simulation result. Any interesting phenomena will be analyzed.Idealization parameters will be reviewed if great discrepancies occur betweentheory and experiment.

Thesis Writing / Dissemination of Research Findings

The final phase of the project to conclude the work is report writing. Someresearch findings will also be published in International Journals.


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control system design of a semi-active anti-roll bar

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