(a)
(b)
Figure 13:
Evolution of stable and unstable manifolds as a function of the damping force coefficients
𝑎
=
1
for
𝑏
=
−
1
,
𝜀
=
0
.
0
2
,
𝜔
=
1
,
𝛿
and two different values of
𝛿
1
=
0
.
0
0
9
0
6
close to the critical value
𝛿
=
0
.
0
0
9
0
. (a)
𝛿
=
0
.
0
1
1
3
(b)
𝜃
0
=
0
.
9
4
7
2
, with following initial conditions:
̇
𝜃
0
=
0
.
2
,
𝜙
0
=
𝜋
,
𝐴
1
for the area
.
