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Describe how resonance in a domestic spin-dryer could be overcome?

  1. Feb 26, 2007 #1
    1. The problem statement, all variables and given/known data
    Describe how resonance in a domestic spin-dryer could be overcome?

    3. The attempt at a solution

    The internal unit of a washing machine or spin-dryer normally includes a washing container, which has a laundry drum mounted in the container such that it can rotate, and an electric motor for driving the laundry drum via a reduction gear, a transmission, or direct drive. The internal unit is suspended in a machine housing such that it can vibrate and constitutes an overall system which can vibrate in a damped manner and which is subject to unbalance-dependent resonance phenomena in specific regions of the rotational speed of the laundry drum. The causes of these resonance phenomena are vibratory movements due to momentary unbalances in the load in the laundry drum. To reduce these unbalance-dependent resonance phenomena, the internal unit is provided with a vibration sensor which is rigidly or substantially rigidly coupled to the internal unit.

    So this vibration sensor detects the rotary vibratory movements of the internal unit about an axis of rotation and transmits the measured values of the vibratory movements to a controller; evaluating, in the controller, the measured values from the sensor in real time; and controlling the electric motor in dependence on an evaluation of the measured values. So resonance can be dampened and eventually overcome.

    Does any of this make sense?
    Is there any thing i can add to this?
    Any help would be greatly appreciated, thanks.
    Last edited: Feb 26, 2007
  2. jcsd
  3. Feb 26, 2007 #2


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    Staff: Mentor

    But what physical means would you use to do the actual damping? I didn't see that addressed in your text (sorry if I missed it).
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