Fig.1 Proportional

For a proportional system, output is directly proportional to input. In effect it is an amplifier or attenuator and is a simple ratio.

Fig.2 Differential

Example 1

Let’s consider a first order link with positive proportional feedback loop.

Thus, the static transfer coefficient and time constant are decreased by ( ).

Example 2

Let’s consider a first order link with negative differential feedback loop.

Static transfer coefficient doesn’t change and time constant is increased by ( ).

№5

5.1 Explain the construction of stability regions using Nyquist stability criterion.

Identify random processes using their probabilistic characteristics?

= const.   = const.

2^nd – stationary process, 1^st – not stationary process.

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