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A method to observe and record vibration modes of rotating circular objects

The vibration amplitudes of a rotating circular saw are recorded as a picture on an oscilloscope, which has a synchronized circular sweep and is intensity modulated by a displacement sensor

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Abstract

A method has been developed to make a record of the vibration modes of a rotating circular disk, in our case a circular saw, at various rotating speeds. A picture is produced on a cathode-ray-tube display and photographed. The vibrations are measured by means of a sensor at a variable position along a radius of the saw. The signal is fed to the intensity input of the display, the oscilloscope beam being swept circularly in synchronism with the saw to derotate the pattern. Exposures are made at successively increasing sensor radius and corresponding sweep radius. The picture obtained is less detailed than a holographic picture, but the method is easy to apply, even for rotating objects with a certain skewness.

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References

  1. Mote, C.C. andSzymani, R., “Principal Developments in Thin Circular Saw Vibration and Control Research,”Holtz als Roh- und Werkstoff,35,189–196 and 219–225 (1977).

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Authors and Affiliations

  1. Department of Physics and Measurement Technology, Linköping University, Linköping, Sweden

    E. Möller (Professor) & U. Ringh (Graduate Student)

Authors
  1. E. Möller
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  2. U. Ringh
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Möller, E., Ringh, U. A method to observe and record vibration modes of rotating circular objects. Experimental Mechanics 22, 226–230 (1982). https://doi.org/10.1007/BF02326362

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  • DOI: https://doi.org/10.1007/BF02326362

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