Simos Vibrations

8/10/2019 Simos Vibrations

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1 BROOKHAVEN SCIENCE ASSOCIATES

Nick Simos

NSLS2 Ground Motion and Vibration Studies


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OBJECTIVE

Based on experience data (including measurements atoperating acilities! integrated "it# large$scale% state$o $t#e$art computational models&

' ma e t#ebest possible estimate as to "#at t#e )i*ration le)els "ill*e once t#e NS+S II structure is placed on t#e ,green$ ield-

' assist in t#e optimi.ation o t#e design o a ,/uiet - acilit0 (treatment o

in$#ouse sources% disruption o )i*ration pat#s% structural inter acesmat t#ic nesses% etc1!


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B SIC !!"O C#

' 23ANTI45 t#e )i*ration criteria "#ic# e0 elements o t#eNS+S6 (ring and experimental lines! 73ST meet

' Esta*lis# t#e ,$reen%&ield- conditions at t#e NS+S6 site

' 7a e t#e lin *et"een t#e ,green$ ield- and t#e NS+S6in rastructure using

8 ,experience- data8 state$o $t#e$art computational met#ods (t#e onl0 a)aila*le tool!

and as a result' estimate )i*ration le)els on t#e ring and experimental loor' identi&' structural pro)isions ensuring sta*ilit0 re/uirements


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NSLS2 Vibration En(ironment) Source Identi&ication


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NSLS II Site *ield Studies

NSLS II Subsur&ace C+aracteri,ation' -ell%settled. stable sands /01 3 &t4s Vs5' -ater table 0 63 &t belo7 $rade


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!# SE I ) II8sin$ C*N *acilit' to +elp identi&'Cultural noise and &ilterin$ e&&ects


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!# SE III9 NSLS II $round motion en(ironment



Comparison 7it+ ot+er :$reen%&ield; sites

Sprin$%1 &ree%&ield conditions are

remarkabl' :



*ield Studies at "ele(ant *acilities

' C*N' Same site conditions as "ell as natural ground motion andcultural )i*ration

' Benc#mar ing o ground motion iltering ( oundationinteraction "it# ground motion!

' !S ) S!rin$%1' 2uanti ication o in$#ouse generated noise

' E ecti)eness o noise$arrest sc#emes' Identi ication o ,ac#ie)ed- )i*ration le)els or ring and

experimental loor (including spatial )aria*ilit0!



C*N > *ilterin$ o& Motion!o7er ) "esponse spectra on *loor Slab



!S9 Operatin$ S'stems ) Induced VibrationGoal9 establis+ attenuation c+aracteristics



!S > Vibration Conditions on "in$ and E?perimental *loor



Sprin$%1 Mec+anical Motion ttenuation



NSLS II Vibration nal'sis*ield data Modelin$



T+e c+allen$e is to best estimate t+e trans&er o& t+emeasured : $reen%&ield; $round motion

@

Measured Free-field Vibration

at NSLS2 siteesultant field de!endent on t"!e of #a$es arri$in% at site

&NL site #it' dee! sand !ri(aril" )*L+, . /a$es



Aualitati(e assessment o& $round motion &ilterin$

NSLS II structure neit+er "IGI norsimple

T"8E interaction can onl' beestablis+ed t+rou$+ detailed=

compre+ensi(e 7a(e interactionanal'sis



Computed Ground Motion *ilterin$

{ } [ ]{ } T

A B H S H S 0123020202 4

=

Input !o7er Spectra 9 actual record rom t#e NS+S II site

Trans&er *unction #/75 9 extracted rom t#e "a)e propagation

and scattering anal0sis

Anal0sis represents t#e computing o t#e transient response toan impulse ("#ite noise! 8 3SE o explicit ormulation t#at ena*les t#e anal0siso )er0 large pro*lems

Ra0leig# "a)es are primaril0 generated and propagated

to"ard t#e NS+S II structure



NSLS II Ground Motion *ilterin$ due to t+e presence o& t+e structurenal'sis CON*I"ME t+at placement o& NSLS II in&rastructure 7ill reduce t+e : $reen%&ield; $round

(ibration conditions



NSLS II OperationsCultural noise $eneration4minimi,ation



Inter&ace Options9 Ser(ice Buildin$ and "ING4E?perimental *loor



"e(ised Baseline OptionSer(ice buildin$ partition4isolation



ttenuation o& mec+anical motion

{ } [ ]{ } T A B

H S H S 0123020202 4 =Input !o7er Spectra 9 actual recordings at Spring$: and A;S

mec#anical rooms (pumps< c#illers% etc1!

Trans&er *unctions 9 extracted rom t#e detailed anal0sis



#o7 do 7e ensure t+at t+e computational models

are leadin$s us to correct estimates@



Validation o 7at#ematical 7odel = ;rocessesComparin$ 7it+ T#EO"ETIC L Model4"esults

Radiating Boundar0 Veri ication Ra0leig# "a)e ield )eri ication

l d l d l



Validation o 7at#ematical 7odel = ;rocessesComparin$ 7it+ E !E"IMENT L "esults

!rediction o& comple? s'stem belo7 per&ormed usin$ same computational procedures and so&t7are



Benc+markin$ a$ainst dedicated tests!S ccess Corridor and E?perimental *loor



RIN> oundation mat optimi.ation *ased on t#e esta*lis#edmodeling and anal0sis


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Noise Suppression &or NSLS2 Sensiti(e Lines


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S8MM "D

' 4ield )i*ration studies con irmed t#at t#e sta*ilit0 limits set or NS+S II(?6@ nm< $@ H.! are satis ied *0 t#e selected site

' 4ield studies at operating acilities #a)e pro)ided realistic le)els o in$#ouse generated )i*ration as "ell as motion attenuation c#aracteristics

' Studies at ot#er acilities also pro)ided a good understanding o "#atmeasures or noise suppression "or and can *e implemented into t#edesign o NS+S II

' T#e use o *enc#mar ed% large$scale d0namic anal0sis modelscom*ined "it# data recorded at ot#er acilities #a)e pro)ided a po"er ultool or assessing t#e anticipated motion at t#e NS+S II experimental andring loors

' T#e com*ined computational model actual noise data also pro)ide t#emeans to optimi.e' T+e in%+ouse noise suppression' T+e rin$ and4or e?perimental &loor t+icknesses


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! T# *O"- "

' 8tili,e t+e ne7l' installed net7ork o& $round motion measurin$stations to monitor bot+ t+e lon$%term (ibration stabilit' o& t+e siteas 7ell as its spatial (ariation

' E?pand t+e site (ibration stud' to include slo7 $round motions /lo7&re

Simos Vibrations

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