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In this paper, I discuss the concept of control by relaxed input. The method allows for the transformation of a non-affine nonlinear system into an affine one. As a result, various control design methodologies for affine systems can directly be applied. The implementation aspect of relaxed input is also discussed.
A nonlinear control strategy for controlling a motion system with mechanical resonance is presented in this paper. A mathematical model of the servo system is derived according to the parameters of an actual system. By using two Tracking-Differentiators, reference input and system output are tracked and their differential signals are given simultaneously. A nonlinear PD control law in velocity loop...
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