The paper introduces a signed scaled graph, using the Hilbert transform to give nonlinear system phase a sign, so phase-lead and phase-lag systems can be distinguished in feedback stability analysis.
Scaled relative g raphs for system analysis,
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On phase in scaled graphs
The paper introduces a signed scaled graph, using the Hilbert transform to give nonlinear system phase a sign, so phase-lead and phase-lag systems can be distinguished in feedback stability analysis.