simulation of dynamic behaviour of the new low floor tram ... · pdf filefloor tram sirio for...

Simulation of dynamic behaviour ofthe new low floor tram SIRIO for

MilanDott. Ing. Mario Romani

Ufficio Calcoli StrutturaliDirezione Ricerca e Progettazione

ANSALDOBREDA S.p.A.

Mario Romani, ANSALDOBREDA S.p.A. 2

Simulation of dynamic behaviour of the new lowfloor tram SIRIO for Milan

Contents• Introduction• Tram model• Linear analyses• Non linear analyses• Works in progress• Conclusions



• 6 Persons

Ufficio Calcoli StrutturaliDirezione Sistema Veicolo (Pistoia)

Competencies• Static analysis (linear and non linear)• Fatigue analysis• Dynamic analysis• Running behaviour / Comfort• Crash analysis



• Main features of SIRIO tram:– Completely low floor tram, with pavement height at

350mm over the top of rail,– Architectural modularity,– Bogies having independent wheels.

• Purpose of analyses:– Simulation of SIRIO tram with SIMPACK.

• The activities on this project are not finished yet

Introduction



Tram model

In order to reuse thesub components of

tram SIRIO for Milanin other projects thedatabase concept ofSIMPACK is very

useful



M o d e l o f T r a m S IR IO f o r M i la n

M o to rB o g ie

T r a i le rB o g ie

J o in t a l lo w in go n ly y a w

J o in t a l lo w in gy a w a n d p i tc h

Model of Tram SIRIO for Naples



• Trailer bogie drawing

Lowfloor

conceptIndependentwheels



• Motor bogie drawing

Lowfloor

concept

Mechanicaldifferential

with lockingcouple



• A) Independent wheels• B) Connected wheels

Independentwheels

topology

Motor bogiewheelsets



Trailer bogiemodel

•Stiffness of primaryand secondary

suspension stage

• Damperscharacteristics

• Bumpers behaviour

•Rubber joints stiffness



• Non linear bumpersbehaviour

• Non linear damperscharacteristics



Motor bogiemodel

•Stiffness of primaryand secondary

suspension stage

• Damperscharacteristics

• Bumpers behaviour

•Rubber joints stiffness



Wheel RailProfiles

• Rail profile: lr UNI3142

• Wheel profile: UNI3332

Wheel RailGlobal Values



• Layout of tram SIRIO for Milan

Dampers between coaches



Model of tramSIRIO for

Milan



Linear analysesInstability analyses

• Modal analysis

• Parameter variation

• Transient phenomena

First mode: Roll mode is not influenced by speed

Second mode:Yaw mode forthe front coach

and the firstmotor bogieThird mode:

Yaw mode forthe rear coach

and the lastmotor bogie



Modal analysis

First mode:

Roll mode

Second mode:

Yaw mode for thefront coach and for the

first bogie plus rollmode

Third mode:

Yaw mode for therear coach and for the

last bogie plus rollmode



Parameter variations• The damping of the longitudinal damper doesn’t change the critical

speed

• The damping of the dampers between coaches has a big influence forthe critical speed



Transient phenomenaThe tram is running over a straight and perfect track; but it isintroduced one initial condition in order to study the transient

phenomena due to it.

Frequencyrelated to thesecond mode



Non linear analysisTime integration analysis of the runs of the tram over some curved and

irregular tracks

The analysis of WR forces is done with aMatlab elaboration, which reads the file created

with the graphical 2D post processing



Post processing of the WR forces



• Adding into the simulation the model ofmechanical differential with locking couple

• Study of tram behaviour in case of wornWR profiles

• Comparison between calculation and testresults

Works in progress



• SIMPACK is very useful for the design ofrail vehicles

• The parameter variations module is a powermethod to explore the design configuration.

• The time integration module is fast

Conclusions

simulation of dynamic behaviour of the new low floor tram ... · pdf filefloor tram sirio for...

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