F
0
3
k
1
m
1
ζ
0.5
ω
1
t
0
ω
0
= 1, ω/ω
0
= 1, c
0
=1, c = 1, φ = 90deg
2
4
6
−2
−4
−6
2
4
6
−2
−4
−6
0,0
–
o
+
←
↓
↑
→
A
B
C
D
E
F
ωt
φ
