Control System Analysis, Time Domain

Example 1 – Transient response of an electromechanical system.

The mechanical system shown in Figure P5.52(a) is used as part of the unity feedback system shown in Figure P5.52(b). Find the values of M and D to yield 20% overshoot and 2 seconds settling time.

 

1. System Dynamic

where:

2. Laplace Transform

3. Motor&Load Transfer Function (θm(s)/Ea(s))

4. Direct Transfer Function

For the system:

The open-loop transfer function Ga(s) is:

5. Closed-loop transfer function

The closed-loop transfer function Gc(s) is:

That is to say:

6. Calculation of M and D

According to:

Besides:

In this way:

Meanwhile:

7. Matlab verification

We use Matlab to corroborate replacing all the values calculated in the original transfer function:

Find the values of M and D to yield 20% overshoot and 2 seconds settling time.

>> stepinfo (sys)

RiseTime: 0.3554

SettlingTime: 1.8989

SettlingMin: 0.9331

SettlingMax: 1.1999

Overshoot: 19.9890

Undershoot: 0

Peak: 1.1999

PeakTime: 0.8059

 

Written by Larry Francis Obando – Technical Specialist – Educational Content Writer

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Escuela de Ingeniería Eléctrica de la Universidad Central de Venezuela, CCs.

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