Modular Approach: Modular Approach



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tarix17.12.2017
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Modular Approach:

  • Modular Approach:

    • Modules of components (sizing, simulation)
    • Architecture: combination of component modules
    • Sizing wave


Module of components:

  • Module of components:

    • Sizing variables
    • Definition parameters
    • Simulation parameters


Principle:

  • Principle:

    • Rotation of a screw leading to a movement of translation of a nut. Nut based on rollers around the screw. End bearings maintain the roller-screw in position.
    • Reduction ratio given by the lead (mm/rev) of the screw.


Scaling Laws

  • Scaling Laws

    • Constant maximum constraint in the material.
    • Homothetic geometrical variation
    • Screw dimension, lead  efficiencies
    • Course, nut and bearing lengths  screw length and mass


Roller screw module:

  • Roller screw module:

    • Sizing variables
    • Definition parameters
    • Simulation parameters


General Description

  • General Description

    • Typical architecture for annular permanent magnet motor.
    • high number of poles  + higher torque density, - lower speed


Scaling Laws:

  • Scaling Laws:

    • Homothetic scaling, constant induction
    • Iron losses function of motor speed
    • Constant max heat power dissipation PJ+Pf=Plosses
    • Number of poles increasing with the motor size


Annular brushless motor module:

  • Annular brushless motor module:

    • Sizing variables
    • Definition parameters
    • Simulation parameters


Nose gear steering system

  • Nose gear steering system

    • Scaled to regional range commercial aircrafts
  • Mission profile

  • 3 electromechanical candidate architectures



Results:

  • Results:

    • In-house prototype developped within a Matlab environment
    • Variation of total mass as function of transmition ratio for each architecture  Mass optimization  Architecture comparison


























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