Last change
on this file since 619 was
465,
checked in by Argimiro Resende Secchi, 15 years ago

Adding a new index3 example.

File size:
833 bytes

Line  

1  using "types"; 

2  

3  # index1 formulation 

4  

5  FlowSheet index_prob 

6  PARAMETERS 

7  e as negative; 

8  

9  VARIABLES 

10  y1 as Real; 

11  y2 as Real; 

12  x as Real; 

13  

14  EQUATIONS 

15  diff(y1)*'s' = y2; 

16  diff(y2)*'s' = x; 

17  y1  e*x = sin(time*'rad/s'); 

18  

19  SET 

20  e = 0.1; # system is unstable if e > 0, and index3 if e = 0 

21  

22  INITIAL 

23  # y1 = 1; # initial condition that tends to be inconsistent when e goes to zero 

24  y1 = 0; 

25  y2 = 1; 

26  

27  OPTIONS 

28  DAESolver (File = "dasslc"); 

29  TimeStep = 0.1; 

30  TimeEnd = 10; 

31  TimeUnit = 's'; 

32  end 

33  

34  # index3 formulation 

35  

36  FlowSheet index_prob2 

37  VARIABLES 

38  y1 as Real; 

39  y2 as Real; 

40  x as Real; 

41  

42  EQUATIONS 

43  diff(y1)*'s' = y2; 

44  diff(y2)*'s' = x; 

45  y1 = sin(time*'rad/s'); 

46  

47  OPTIONS 

48  DAESolver (File = "dasslc"); 

49  TimeStep = 0.1; 

50  TimeEnd = 10; 

51  TimeUnit = 's'; 

52  end 

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