Asymptotic bode plots

1. What is an asymptotic Bode plot?
2. What is an asymptotic plot?
3. Can we draw Bode plot for unstable system?
4. What is Bode and Nyquist?

What is an asymptotic Bode plot?

Asymptotic Bode plots are useful for quick manual analysis of a designed control system with a reasonable degree of accuracy [5]. They are also important for understanding the role of each parameter of the given transfer function in deciding the shape of its Bode response [6].

What is an asymptotic plot?

Asymptotic Magnitude: The asymptotic phase plot starts (at low frequencies) at 0° and stays at that level until it gets to 0.1·ω₀ . At that point the phase starts rising at +45°/decade until it gets to +90° at 10·ω₀, at which point it becomes constant at +90° for high frequencies.

Can we draw Bode plot for unstable system?

As we will see in an example, it is possible to draw a perfectly normal-looking Bode plot for a system that we know is unstable [2]. A Bode plot is actually comprised of two plots, the magnitude and phase plots.

What is Bode and Nyquist?

In brief, Bode (rhymes with roadie) plots show the the frequency response of a system. There are two Bode plots one for gain (or magnitude) and one for phase. The amplitude response curves given above are examples of the Bode gain plot. The Nyquist plot combines gain and phase into one plot in the complex plane.