Jilin University 22 spring March "automatic control principle" work assessment-00050

Random questions , The whole set , It's just part of it

​ Random questions , The whole set , It's just part of it

​ Random questions , The whole set , It's just part of it
Jilin University 22 In the spring 3 month 《 Automatic control principle 》 Homework assessment -00050
Total score of test paper :100 score :100
One 、 Draw a picture ( common 5 Two questions , common 40 branch )
1. The schematic diagram of automatic liquid level control system is shown in the figure . In any case , Hope the liquid level is high c Remain unchanged , Try to explain the working principle of the system , And draw the system principle block diagram .
{ chart }

2. Open loop zero is known 、 The pole distribution is shown in the figure , Try to sketch out the corresponding closed loop root locus .
{ chart }

3. Try to draw... Separately { chart } Phase trajectories of , And compare the similarities and differences between the two (T>0).

4. Let the open-loop transfer function of the unit feedback control system be as follows , Try to sketch out the corresponding closed loop root locus ( It is required to determine the coordinates of the separation point d):
{ chart }

5. The schematic diagram of automatic voltage regulation system is shown in the figure . When the load current IF When the change , Alternator G The voltage drop of the armature winding also changes , The terminal voltage cannot be kept constant . To compensate for this effect , Turn the resistance RF The voltage at which the voltage drop across the is amplified U1 Negative feedback to the input , And Uf Compare make If And then change , To compensate for armature voltage drop , Keep the terminal voltage constant . Try to point out the input of the system 、 Output 、 Disturbance quantity and control object , And draw the system principle block diagram .
{ chart }

Two 、 Calculation questions ( common 5 Two questions , common 50 branch )
6. The open-loop transfer function of a unit feedback system is known { chart } Try to determine when the system is stable K Range of values .

7. The open loop logarithmic amplitude frequency characteristics of the minimum phase control system are shown in the figure . Try to find the open-loop transfer function G(S).
{ chart }

8. The system structure diagram is shown in Figure 4 Shown :
{ chart }{ chart }
1、 Write the closed-loop transfer function { chart } expression ;
2、 Make the system meet the conditions :{ chart },{ chart }, Try to determine the corresponding parameters { chart } and { chart };
3、 Find the dynamic performance index of the system at this time { chart };
4、{ chart } when , Find the system by { chart } The resulting steady-state error { chart };
5、 determine { chart }, To disturb { chart } Output to the system { chart } No influence .

9. It is known that the open-loop transfer function of the system is { chart } All are greater than 0 , Use Nyquist stability criterion to judge system stability .

10. It is known that the open-loop transfer function of a system is
{ chart }
1) Draw the approximate amplitude phase curve of the open loop system ;
2) The stability of the system is judged by the Nyquist stability criterion ;
3) Draw logarithmic amplitude frequency characteristic curve of open loop system .

3、 ... and 、 Comprehensive questions ( common 1 Two questions , common 10 branch )
11. It is known that the open-loop transfer function of the feedback control system is
{ chart }
The closed-loop stability of the system is judged by using Nyquist criterion .