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SIGVIZ: Time History, Fourier Transform and Wavelet Transform Analysis September 30, 2009

Posted by thelifeexamined in Code.

The Matlab Code SIGVIZ provides a quick way to visualize the Time history, Discrete Fourier Transform and Wavelet Transform (using the Morlet wavelet).  This code should be useful for the analysis of systems with time and frequency dependent dynamics.

Initial investigations of flapping wing vehicles have demonstrated several characteristics in which wavelet analysis might prove useful.   These include the presence of time-varying vortices, unknown time and frequency dependent lags in the system, and structural resonance while flapping.  These features were demonstrated in the paper Time-Frequency Analysis of Aeroelastic Deflections of Flapping Wings (R. Love, R. Lind, AIAA ASM 2009).


1. Download Matlab files: simpleexample.m and sigviz.m into the same directory.

2. Run simpleexample.m (Example: simple 20Hz sinusoid) to understand the effects of changing the various input parameters.

3. Modify simpleexample.m to include your input signal and corresponding time vector.



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