Frequency characteristic curve of second-order closed-loop system I. Experimental requirements 1. Study the influence of the structural parameters of the second-order closed-loop system - natural frequency (undamped oscillation angular frequency) ωn and damping ratio ξ on the logarithmic amplitude-frequency curve and phase-frequency curve. 2. Understand and master the calculation of the logarithmic amplitude-frequency characteristic (ωL) and phase-frequency characteristic (ωϕ, real frequency characteristic) Re (ω and imaginary frequency characteristic) Im (ω in the second-order closed-loop system 3. Understand and master the calculation of the natural frequency ωn, damping ratio ξ, resonant frequency ωr and resonant peak value L (ωr) in the underdamped second-order closed-loop system. 4. Observe and analyze the resonant frequency ωr and resonant peak value L (ωr) of the underdamped second-order closed-loop system, and compare them with the theoretical calculated values. II. Experimental principle and description The block diagram of the system under test is shown in Figure 3-1.
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