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AndroBode User's manual

AndroBode is an Android software written to assist students in drawing Bode plots: one of the most commonly used representations of linear transfer functions. Supported features are:
  • Drawing of transfer functions in the Bode form.
  • Graphical representation of transfer function formula being edited.
  • Zooming and panning of the generated Bode plots.


The first tab shows an example of the Bode form, which can be used as a reference to edit the transfer function.
The second tab can be used to insert first order or binomial factors in the formula. To choose if the factor has to be inserted at the numerator or at the denominator, simply use the "Num", "Den" radio buttons in the right part of the screen. Supported commands are :
  • Adding
  • Modifying
  • Deleting

To select the factor which has to be modified or deleted, simply click on the desired factor in the formula below.
The third tab can be used to insert second order or trinomial factors in the formula. To choose if the factor has to be inserted at the numerator or at the denominator, simply use the "Num", "Den" radio buttons in the right part of the screen. Supported commands are :
  • Adding
  • Modifying
  • Deleting
To select the factor which has to be modified or deleted, simply click on the desired factor in the formula below.
The "n and K" tab, can be used to modify the gain "K" and the exponent od the monomial "s" factor. From here it is possible to launch the command to draw the Bode plot, just clicking on the "Plot" button. An example of the generated Bode plot is shown in the following image.
To insert poles in the origin you can set the exponent n. Setting n to negative values inserts the desired number of zeroes in the origin.
The bode plot shows an upper part which is the representation of the gain, and a lower part, which represents the phase. Both asymptotic (red line) and real (blue line) rapresentations are shown. Each one of the plots can be zoomed or panned just touching the screen. The vertical and horizontal axes can be zoomed indipendently.