Plotting Peak Vertical Accelerations at Mid-Span

  1. In the Harmonic study tree, right-click the Results folder and select Define Response Graph.
  2. In the PropertyManager, under Y axis do the following:
    1. Select Acceleration.
    2. Set Component to AY: Y Acceleration.
    3. Set Units units.png to in/s^2.
  3. Click PM_OK.gif.

    The unit for X-axis is Frequency (Hz), and for Y-axis is AY amplitude (in/sec2). The peak acceleration occurs at frequency 15.69 Hz (second natural frequency). The graph depicts the peak positive acceleration at the mid-span for the range of operating frequencies. In reality, both beams undergo negative and positive accelerations due to the applied harmonic load.