Computer Aided Harmonic Linearization of SISO Systems Using Linearly Approximated Static Characteristic

Harmonic linearization, also known as describing function analysis is well known method for analysis of SISO systems. Computer aided harmonic linearization, as experimental practical method for determining static characteristics and describing functions is described. The use of linearly approximated static characteristic in determination of describing function introduces an inherent error resulting from the difference between original static characteristic and corresponding linearly approximated static characteristic. Error estimation and comparison of approximated characteristic error with the actual error is illustrated on several examples.