Second order systems systems described by a second order differential equation Second order systems contain two kinds of energy storage elements: Lump mass and spring
2.1 Modeling of physical systems Model of system-the relationship between variables in system Differential Equation (mathematic model) (parameter model) · Block Diagram and Transfer
Summary of rules for plotting root locus Rule #l The starting points and the End points of the root locus(根轨迹的起点和终点) Rule #2 The Segments of the Root Locus on the Real axis(实轴上的根轨迹)