a[mm]/l - Memorial University of Newfoundland DAI

face Concrele rtraln war recorded on [he comprcrslon surface only. Before conducun:
the test. the concrece specmen and the cqutpmcnl were carefully ~nrpecred. Careful
awnnon had rlra been :men to the scrul~ny of psges. wxres and data ilcquirnt~on synem
dunnp tcnmg.
A dnla acqutrxtlon system based an 3 personal computer at I rampl~ng rate of
IW HI war used ln thlr clipenmen1 Labteeh Nnebwk software wu% used inr dvla
acqu~s~t!on and pmess fonlml software was uultud. The data acqulrnton ryrrcm her n
bu~ld-ttmc rhs enabler to configure the set-up. and a run-tlms (ha eontmlr 3e dau
ncqu~nson and other functton Thns bra acqulrtrton system cm be used to conunuourly
manftar ilnd record all types oc pracers vannbler tneludlng volmge. arannr. d~rplacement.
md ncceleranonr at the wannmg ttme of 1 mtcm-second.
There are two barlc types of pmecsr contml. open loop and closed loop In m
open loop controlling pmcers. as used I" thlr research, analog output blacks mnsmlr
wavefamr Lo the contml hardware dunng mn-ttmc operatton. In closed loop control. the
controlled system rends response data through Ihc tnsrfacc device to rhc m-rime The
dau ourput functmn uses lhlr tnfomat~on to convert raw data from an tnterface devtce
into rppropnntc rc~enulic or engnneenng unit such ar stnsn. dlrpk~cemcnt and
accelerallan The data acqulslrton rptem used 8" lhns study 13 shown tn Rpure 3.18 and
mrtrumentn8on black-dnagrdm a gwen ~n Rgure 3.18.