SEARCH Articles Figures Tables Amplitude Response — Second-Order System Analysis of Second-Order, Three- and Four-Spin Systems by Inspection Bode diagram second-order system Frequency response characteristics of second-order systems General case for an underdamped second-order system Generalized second-order system response to a unit step input Order systems Ordered systems Phase Response — Second-Order System Second-order irreversible system Second-order linear system Second-order reversible system Second-order system closed-loop frequency Step forcing function second order system Underdamped second-order system