reu presentation -vibration suppression of a two-story structure using smart memory alloy springs...

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


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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


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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


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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


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in prein pre--tensiontension First it is wound uFirst it is wound u

around threadedaround threaded

rod tightlyrod tightly


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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


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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


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First floorFirst floor SecondSecond

floorfloor


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X0

X0

F=kX0

F=kX0


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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)


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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


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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)


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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


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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


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



1

2

tion

m/s2

-1

0

Accelera

-4

-3

-2

0 10 20 30 40 50 60

Time /s


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reu presentation -vibration suppression of a two-story structure using smart memory alloy springs...

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