Voice Coil – Multibody, Multi-Domain Physical Model in MapleSim – Maplesoft

Voice Coil

This model demonstrates the challenges of controlling the position of a hard-disk head that is mounted on a flexible positioning arm. Not only does the controller need to deal with the arm flexibility, there is no way of directly determining the head position. This has to be inferred from the position of the arm. Using MapleSim, it is possible to predict the dynamic behavior of the positioner arm and develop a control strategy that will position the head within acceptable tolerances.


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Model: Voice Coil

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Model Images
  • VoiceCoil An LQG (Linear Quadratic Gaussian) controller compensates for the arm flexibility.
  • Voicecoilplot A plot of the motor and arm angles. The difference is due to arm flexibility.
  • schematic An LQG (Linear Quadratic Gaussian) controller compensates for the arm flexibility.