Coefficient diagram method: Difference between revisions

Revision as of 13:50, 3 June 2009

Revision as of 13:52, 3 June 2009

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'''Coefficient diagram method''' (CDM), developed and introduced by [[Prof. Shunji Manabe]]<ref>[http://www.cityfujisawa.ne.jp/~manabes/ Prof. Shunji Manabe]</ref> in 1991. CDM is an [[algebraic]] approach applied to a [[polynomial]] loop in the parameter space, where a special diagram called a "''coefficient diagram''" is used as the vehicle to carry the necessary information, and as the criteria of good design <ref>S. Manabe (1998), "''Coefficient Diagram Method''", 14th IFAC Symp. on Automatic Control in Aerospace, Seoul.</ref>. The performance of the closed loop system is monitored by the coefficient diagram.

The most important properties of the method are: the adaptation of the polynomial representation for both the plant and the controller, the use of the two-degree of freedom (2DOF) control system structure, the nonexistence (or very small) of the overshoot in the step response of the closed loop system, the determination of the settling time at