TD6 : Circuits linéaires du deuxième ordre, oscillateurs, filtrage

        
TD6 : Circuits linéaires du deuxième ordre,
oscillateurs, ltrage
Exercice 1   
E
Ki(t)
L
C
u(t)
            
 C   t= 0    K
      u(0+)  i(0+)
           
   ω0   L C
         u(t) i(t)
    
    EC(t) EL(t)             
    
           
         
Exercice 2        
     m      k        x 
     
        q         
   C    L  
          
Exercice 3    
E
K
R
iR(t)
Rg
C
iC(t)
L
iL(t)
u(t)
         
        
      t= 0   
       u(t)
          u    t= 0t= 0+  t→ ∞
         K      Q    R 
    Q    
      u(t) t > 0         
  w0     Q    Q      
     R=  C=   L=             
                     C
Exercice 4    
      m      k       
f=γv              x          
 
0 0.4 0.8
4
2
0
2
4
 
 
0 0.4 0.8
2
0
2
 
 
42 0 2 4
2
0
2
 
 
               m
      ω0     Q 
       x(t)     ¨x+γ
m˙x+k
mx= 0      
        mk γ
   m=   k γ
Exercice 5    
      
L
C
CL
RC
L
R
L
C
Exercice 6       
RC L
           
   ω
          
          ω0  
  Q 
     
     φ      
     e(t) = E0(ωt)    
 
  
        
Exercice 7      
                
0 20 40 60 80 100 120
0
0.5
1
ω
 
0 20 40 60 80 100 120
π/2
π
ω
 
      ω0     Q  
                   
ω0=1
LC  Q=1
RrL
C
              m=     ω0   
           
Exercice 8    
R1
C1
C2R2           
   ω  R2 C2   R1C1 ω 
    
Exercice 9     
0 10 20 30 40
0
2
4
6
 
 
       
        
       
         
           
      
Exercice 10    
ω03ω05ω07ω0
0
2
4
6

 
ω
GdB
ω03ω0
3
60
                      
        
         
              
                     
        
            
            
Exercice 11    
           
(ω) = 1
1 + jQ ω
ω0ω0
ω
      
       GdB (ω)  
     GdB(ω) ω0 ω→ ∞
                ω0 ω  Q= 1
             ω
     GdB =  G=1
2   ω=ω0
Q
  
1 / 2 100%
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