Transcript Fast_MOST_Objectives_and_Plan

NEES FAST-MOST
Bozidar Stojadinovic
Gilberto Mosqueda
UC Berkeley
Objectives
 Improve reliability of results from
geographically distributed hybrid
simulations
 Increase speed of test


Reduce the time it takes to load
experimental substructures
Minimize network communication
 Implement algorithms for continuous
loading of experimental substructures
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Challenges
 Continuous methods are based on realtime algorithms
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Network communication time is random
Integration task time may be random
 Need fault-tolerant mechanism to deal
with uncertainties
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Occasional event: network delays
Rare event: integrator crashes or
communication with remote site is lost.
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Current Status
 Simulation only code is complete
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Code is adapted from July MOST developed at UIUC
Structural model changed to 6-span bridge model
 Deck and one column are numerical models
 Other 4 columns are independent experimental models
 Simple to add or remove number of experimental sites

Event-driven model in Simulink was distributed to
‘fast_hybrid’ email list in December
 Remaining tasks
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Need to determine who is involved as experimental and
computations sites; schedule a simulation run
Sites to implement event-driven model and link to MOST
code and experimental setup
Optimize NTCP for speed, relax constraints on control of test
from ‘simulation coordinator’ point of view – to discuss
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Structural Model
 6-span bridge model
 Span and one column are numerical models
 Other 4 columns are experimental models
Computational Sites:
UIUC/NCSA
Experimental Sites:
Berkeley
Boulder
UIUC
Buffalo
Lehigh
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Current NTCP Configuration
UIUC
U. Colorado
Computational Model
Computational Model
f1
f2
m1
xg
TCP/IP Link
SIMULATION
COORDINATOR
TCP/IP Link
xg
TCP/IP Link
m1
f2
f1
Source:MOST presentation
(Spencer et al.)
NCSA
Computational Model
xg
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Proposed NTCP Configuration
UIUC
U. Colorado
Computational Model
Computational Model
f1
f2
m1
xg
xg
SIMULATION
COORDINATOR
TCP/IP Link
TCP/IP Link
m1
f2
f1
NCSA
Computational Model
xg
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Comparison of NTCP Configuration

Existing Protocol:
1. propose(comp)
2.
3.
4.
5.
6.
getResponse(comp)
Execute(comp)
getResponse(comp)
For No of SITES
propose(expsite)
getResponse(expsite)
For No of SITES
querry(expsite)
getResponse(expsite)
For No of SITES
execute(expsite)
For No of SITES
getResponse(expsite)
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Proposed Protocol with
integrated simulation
coordinator and computational
site:
1. For No of SITES
2.
3.
propose(expsite)
For No of SITES
getAcceptResponse(expsite)
For No of SITES
if accepted
getResponse(expsite)
else
pause simulation
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Conclusion
 Which sites will be involved as experimental
sites; provide specimen characteristics
 Sites must try out the Matlab Fast-MOST code
and Simulink model and verify if they can run
it; provide comments or suggestions
 Develop time line for doing a computer-only
simulation
 Develop a time line for doing a hybrid
simulation
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