PowerPointPrsentation

1
EURNEX Rail Test Facilities Managers
Meeting Praha, 25th November 2005

Opportunities for Applied Research in Vehicle
Dynamics for the Vehicle Acceptance Market
Dr Javier Perez Research Engineer Rail
Technology Unit Manchester Metropolitan
University
2
Posible contributions in vehicle dynamics for
vehicle acceptance

• Similar requirements in different countries, but
  application somewhat different.
• Vehicle acceptance process would benefit of
  vehicle dynamic simulations because
• Flexibility wide variety of conditions
  considered
• Cheap and fast
• Modernisation standardisation of on-track
  measurement methods and equipment also a priority
  for future interoperability.

3
Simulation Techniques in vehicle acceptance (I)

• Acceptance by simulation not introduced in Europe
  (but partially accepted in the UK!)
• Simulation cannot substitute completely actual
  tests! The approach would be

Simulation based
Conventional
4
Simulation Techniques in vehicle acceptance (II)

• Risk involved The model is not the real vehicle!
• Limitations of the modelling techniques
• Data collection/parametric uncertainties
• Modelling/human errors
• Solutions
• Methodologies for modelling /data collection
• Rigorous methods for model validation
• Develop standard modelling/simulation tools

5
Simulation Techniques in vehicle acceptance (III)

• Main potential benefits
• Avoid need of track concessions.
• Much cheaper and faster!
• Flexible testing conditions Leaf fall, rain,
  ice, wind Variety of routes!
• Some additional benefits
• Manufacturers can introduce virtual testing in
  early phases of vehicle development, reducing
  uncertainty
• Availability of computer simulation scenarios for
  different countries allows designing vehicles
  oriented to interoperability ?? Minimise changes
  in design.

6
Simulation Techniques in vehicle acceptance (IV)

• What can be done from research to fill those
  gaps?
• Develop computer models/scenarios for virtual
  testing
• Define validation conditions for computer models
• Validate computer models/scenarios Vs. real tests
  for specific types of vehicle
• Develop a complete set of simulation scenarios
  covering requirements of several countries
  throughout Europe ? Allow designing interoperable
  vehicles

7
Improved on-track measurement equipment and
techniques(I)

• On-track tests are complex and expensive because
• Track access is not easy to obtain ? No much to
  do about this!
• On-track test equipment is not easy to install.
  Often, it must be made and calibrated express for
  each case
• Definition of requirements for these equipment
  often not rigourous!

8
Improved on-track measurement equipment and
techniques(II)

• Combined effort between industry/research
  institutions/acceptance bodies could lead to
  measurement productstechniques which are
• Standardised
• Interchangeable
• Easier to mount and use.
• Reliable.

9
Improved on-track measurement equipment and
techniques(III)

• In vehicle dynamics, special applications of
  interest would be systems for measuring track
  forces (force measuring wheels or other types of
  devices)
• Research on measurement equipment could also be
  directed to new types of test.
• Example Track stiffness deformation
  measurements