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a ) The plant in isalation comprisenta only the ball, betam arnd pivot and has the transfer function P ( s ) = w 3

a) The plant in isalation comprisenta only the ball, betam arnd pivot
and has the transfer function P(s)=w31s11.
Determine the polen of the plant.
ii) Comment on the stability of the plant based on the pole
values.
iii) Qualitativaly juatify your arnawer basaed on the phyaica of
the plant.
A position control system with a PO controller which is capable of
moving the ball to a given position along the beam (a desired
position) is shown in Figure 3.2.
Figure 3.2. Bal and beam postion control system with a PD controller.
armpatude of 15cm for Np=7 and Ks=20 is depicted in Figure
Fipure 3.3. Step reaperise of the panibion control myatem.
c) The poles of the closed loop system are:
p1=-99.367,p2.3=-0.3163+-j0.2189,
mark the pole positions on the complex plane. Use this
information to discuss the stability of the syalam. Explain
qualitatively the relations between the pole positions and the step
resporise in Figure 3.3.
d) A different physical system with simple real poles is connected in
a closed-loop configuration without a controller. When subjected
to a reference step input, the output exhibits a steady-state error
as would be expected. To eliminate the steady-state error, a PID
controller is added. Which term of the PID controller would yos
adlust? Would is be increased or decreased? Justify your answer.
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