Quantitative Nyquist array feedback design

It is feasible to combine aspects of various existing control methodologies to produce a hybrid feedback design methodology that is at once more powerful than any of the original constituents taken individually. In this paper, the inverse Nyquist array (INA) is combined with a generalized quantitative feedback theory (QFT) to produce a hybrid: quantitative Nyquist array (QNA) which solves problems neither method could handle effectively individually. Along the way, the basic μ-equations are also invoked. An engineering example comparing a QNA solution to a corresponding μ-solution is included in order to demonstrate the power and simplicity of the new method