Upload
december
View
77
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Example 4.4. No damper. No damper. TMD at node 2 Tune to mode 1. TMD at node 2 Tune to mode 1 modal mass =1.25 modal amplitude =1.0 Want equivalent modal damping = 0.1 Requires mbar =.065 The appropiate damper parameters are f=.91 =.145 - PowerPoint PPT Presentation
Citation preview
Example 4.4
sT
sT
kc
c
c
k
k
m
m
ii
408.
99.15
0.1
2
0064.
02.
505.
752.
96.78
44.118
0.1
0.1
2
2
1
1
1
2
1
2
1
2
1
ω
πω
α
α
ξ
5.
0.1
0.1
5.
2
1
25.1~
25.1~
2
1
m
m
No damper
No damper
TMD at node 2 Tune to mode 1TMD at node 2 Tune to mode 1
modal mass =1.25
modal amplitude =1.0
Want equivalent modal damping = 0.1
Requires mbar =.065
The appropiate damper parameters are f=.91 =.145
mdamper=1.25mbar
=.081
dξ
134.
71.591.
64.2
1
d
d
d
c
k
ωω
Mode shapes -TMD tuned to mode 1
Modal periods
Periodic forcing T = 1s
Periodic forcing T =1s
TMD at node 2 - Tuned to mode 2
48.c
36.31k
46.14
15.m
5.4u
u
11.
.94f
03.
049. and 15.For
2.~)(
5.
25.1~
d
d
d
d
d
d
2
22
222
22
2
ω
ξ
ξξ
φ
φ
m
mm
mm
m
eq
dd
TMD tuned to mode 2
TMD tuned to mode 2
Periodic forcing T =.4stuned to mode 2
TMD tuned to mode 2periodic forcing T =.4s
TMD tuned to mode 2periodic forcing = .4s
TMD at node 2 Tuned to mode 1T =1s
TMD at node 2 Tuned to mode 1T=1s
Earthquake loading - No TMD
TMD tuned to mode 1
Earthquake loading -No TMD
TMD tuned to mode 1
Tforcing=1sTMD at node 2 Tuned to mode 2
T = .408s
Tforcing=1sTMD at node 2 Tuned to mode 2
T =.408s
Example 4.2
sec1
2
39438
1000
075.
135.
94.
05.
,
T
k
m
f
m
eqv
optd
opt
πω
ξ
ξ
Mode shapes
Inter-element profiles
Damping ratios
Modal response- T=1sec
Damper properties
Nodal and damper displacementsT=1sec