EGR%20301

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EGR 301 Applications for ARIMA Simulations
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Simulating the time series
Stabilizing the time series
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Purpose Parameterize the accelerogram. Relate
parameters to source and site parameters. Simulate
acceleration histories. Note Include
cross-correlation for components and
sites. Include parameter uncertainty to create CI
envelopes. Used a frequency-constrained ARMA
(2,2).
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SCTI (recorded) Simulated
(simulated)
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Reliability-based Design of Wastewater Treatment
Plants
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Influent
Effluent
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1. Simulate influent BOD mass loading Model
(1-fB)(1-FB7)Zt C at Application
Reliability-based design
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2. Simulate upsets When BOD/(NH3 TON) gt 10 ?
upset BOD and NH3 are positively
correlated. Model (1-fB)(1-FB7)Zt C
at Diagonal, multivariate Application
Reliability-based
design Note multi. ARMA predicts half
of univ. upsets.
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3. Plant operation Permit Weekly BOD effluent
average lt 20 mg/l 90 of time. Question What
should BOD effluent be? Model (1-fB)ln(Zt) C
at From simulations take weekly
averages. (Present mean/present 99 reliability
value) (target mean/permit value) 3.14/5.9
target mean/20 ? target mean 10.6 mg/l Note
assume constant coefficient of variation (s/m)
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