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QUALITY INDEX OF PULSE GENERATOR IN FUZZY MODEL
07.07.2022 14:12
[3. Technical sciences]
Author: Bozhko Konstantin, associate professor, PhD, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”; Rudenko Sergij, student, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
In practice, pulsed waveforms can be very different from a square wave. In addition, there may be no signal symmetry in amplitude and time (Fig. 1).
Figure1. – Pulse signal: function generator JDS6600; frequency 30 MHz; amplitude 5V
A Mamdany fuzzy model developed the quality of the pulse generator. Inputs functions is:
- Peak-to-Peak (non-symmetry in amplitude; from 0% to 15%);
- Duty (non-symmetry in time; from 0% to 4%);
- Rise-and-Full (triangular form; from 0% to 50%).
Membership functions for inputs is Gauss.
Membership functions for output is triangular.
Name of output is “Pulse-Generator-QI”. Scale of output is from 0 (high quality index QI) to 100 (low QI) balls.
Number of rules is 27.
Modelling in fuzzy toolbox MATLAB view a figure 2.
Figure 2. – Modelling of pulse generator quality: Peak-to-Peak is 7.5%; Duty is 2%; Rise-and-Full is 25%;
Pulse-Generator-QI is 50 points
The practical quality index scale has the best score of 14.6 points and the worst score of 85.4 points.
Quality index of function generator JDS6600 is:
- Frequency 20 MHz – 84.2 points;
- Frequency 1 MHz – 47 points;
- Frequency 100 kHz – 36 points.
The rules of the model have equally high requirements for all three inputs. When editing the rules, you can get a higher quality score for the pulse generator.
The given model is an example of the use of fuzzy modelling for evaluating the shape of electrical signals.
Ця робота ліцензується відповідно до Creative Commons Attribution 4.0 International License
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