1. standard ROUTH and HURWITZ: is a method of algebra, for facts on computerabsolute stability of a linear system does not change over time. These standards will tryjust how much differentiating the equation feature is located in the left and right again, again on the shaftvirtual.2. Map image, working area of zero (Root Locus Plot): presents a map of the Center area of thethe characteristic equation when a certain parameter of the system is changed. Whenan unrecorded number of test area is on again to the plane s, glass round system was unstable.3. standard NYQUIST: a sale method-map-graphics(Semi-transparent graphical), for facts on the difference between the number of Poles and zeros of the transfer function of the loopsealed by observing the status of image map image NYQUIST. This method needs to know the locationof zero.4. Bode diagram: the diagram of a closed-loop transfer function G Bode (s) hour (s) can be used to identifyplan stability of closed-loop system. However, can only be used when the G (s) H (s) do not have thePoles and zeros in the right half-plane of s.5. standard LYAPUNOV: is method of determining the stability of nonlinear systems,but can still apply for the linear system. The stability of the system is determined byexamining the nature of the Lyapunov function.
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