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Problem 9.14PP
Derive the describing function for the ideal contactor controller shown in Fig. Is it frequency 
dependent? Would it be frequency dependent if it had a time delay or hysteresis? Graphically 
sketch the time histories of the output for several amplitudes of the input and determine the 
describing function values for those inputs.
Figure Contactor for Problem
Step-by-step solution
Sketch the given figure.
Step 1 of 7
Step 2 of 7 ^
The standard equation is u ( t) - asin(dv) and sin Qat +
Step 3 of 7
This is an odd nonlinearity so that all the cosine terms are zeroes and the DF is real
— J|j*^[j4sin(atf)-l]sin(aif) d(ait)
Step 4 of 7
ATOn further simplification we get 2̂ = — cos(

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