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8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Vibration Suppression of aVibration Suppression of a--
Smart Memory Alloy SpringsSmart Memory Alloy Springsv a ase so at on ec no ogyv a ase so at on ec no ogy
By: Jason Rieg ler By: Jason Rieg ler
t sp ec a t an s t o : r . on g , r . u ,t sp ec a t an s t o : r . on g , r . u ,Claud io , Devendr a , Ha iyang Claud io , Devendr a , Ha iyang
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Isolate substructure fromIsolate substructure from
Predominant FrequencyPredominant Frequency
FixedFixed--base Frequency (base/slider)base Frequency (base/slider)
(superstructure/first and second(superstructure/first and second
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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multilayered laminated rubber bearingsmultilayered laminated rubber bearings--
bearingsbearings
Slides against the seismic shockSlides against the seismic shock
e ects v rat one ects v rat on
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Two unique effects:Two unique effects:
ape emory ecape emory ec
transforms back into its predeterminedtransforms back into its predetermined
SuperSuper--elasticityelasticity
loadingloading
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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in prein pre--tensiontension First it is wound uFirst it is wound u
around threadedaround threaded
rod tightlyrod tightly
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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..
Heat at 450Heat at 450 C forC for1010--15 min.15 min.
Cool in water forCool in water for m n.m n.
RepeatRepeat --4 times4 times
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Number of coilsNumber of coils
More coils, less stiffMore coils, less stiff
Less coils more stiffLess coils more stiff
Must be good inMust be good in
Tension andTension andompress onompress on
Distance between coilsDistance between coils
Diameter of springDiameter of spring
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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First floorFirst floor SecondSecond
floorfloor
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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X0
X0
F=kX0
F=kX0
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Four superFour super--elastic springs (baseelastic springs (baseisolated)isolated)
Two superTwo super--elastic springs (baseelastic springs (base
isolatedisolated NonNon--base isolatedbase isolated
Two steel springs (base isolated)Two steel springs (base isolated)
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Four super-elastic springs (base isolated) Two super-elastic springs (base isolated)
2
2.5
m)
Displacement of base during El Centro 0.1g
1.5
2
m)
Displacement of base during El Centro 0.1g
1
1.5
lace
ment(
.
0
0.5
1
lacement(m
-0.5
0
0.5
Disp
-1.5
-1
-0.5Dis
0 10 20 30 40 50 60-1.5
-1
0 10 20 30 40 50 60-2.5
-2
2.1702 mm
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Two steel springs (base isolated)
3
4
5
ent(mm
).
1
2
Displace 4.11 mm
-2
-1
0
-5
-4
-3
0 10 20 30 40 50 60
Time (sec)
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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Four su erFour su er--elastic s rin s base isolatedelastic s rin s base isolated
Maximum Displacement = 2.0722 mmMaximum Displacement = 2.0722 mm General Range of Displacement = 0.7 mmGeneral Range of Displacement = 0.7 mm
Two superTwo super--elastic springs (base isolated)elastic springs (base isolated) Maximum Dis lacement = 2.1702 mmMaximum Dis lacement = 2.1702 mm General Range of Displacement = 1.2 mmGeneral Range of Displacement = 1.2 mm
Maximum Displacement = 4.1051 mmMaximum Displacement = 4.1051 mm General Range of Displacement = 2.1 mmGeneral Range of Displacement = 2.1 mm
8/8/2019 REU Presentation -Vibration Suppression of a Two-Story Structure Using Smart Memory Alloy Springs via Base Isolation Technology
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5
Kobe--Acceleration of Second Floor
3
4
SMA springs
0
1
rationm/s2
-2
-1Accel
-5
-4
-
Time /s
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El Centro--Acceleration of Base
1
1.5
Non-Base Isolated
Base Isolated - 4 springsBase Isolated - 2 springs
0
0.5
atio
n(m/s2)
-1
-0.5
Acceler
0 10 20 30 40 50 60-2
-1.5
Time (sec)
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2
3
Non-Base Isolated
Base Isolated - 4 springs
Base Isolated - 2 springs
El Centro--Acceleration of First Floor
1
(m/s2)
-1
0
celeration
-3
-2A
Time (s)
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SECOND FLOORSECOND FLOOR
A ELERATI N A ELERATI N El Centro--Acceleration of Second Floor
3
4
Non-Base Isolated
Base Isolated - 4 springs
Base Isolated - 2 springs
1
2
tion
m/s2
-1
0
Accelera
-4
-3
-2
0 10 20 30 40 50 60
Time /s
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