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The MOST Experiment: Earthquake Engineering on the Grid

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Title: The MOST Experiment: Earthquake Engineering on the Grid


1
The MOST Experiment Earthquake Engineering on
the Grid
  • Lee Liming
  • George E. Brown, Jr. Network for Earthquake
    Engineering Simulation (NEES)
  • National Science Foundation
  • Division of Civil and Mechanical Systems

2
Vision of NEES
NEESgrid
3
  • NEESgrid facilitates research capabilities
    previously unavailable
  • NEESgrid links earthquake researchers across the
    U.S. with leading-edge computing resources and
    research equipment and allowing collaborative
    teams (including remote participants) to plan,
    perform, and publish their experiments
  • NEESgrid is a coordinated and secure
    architecture/environment
  • NEESgrid is a modular and extensible environment
    with a customizable user interface
  • NEESgrid provides common tools that allow
    leveraging resources and experiences
  • Rather than having to worry about the required
    cyber infrastructure, NEESgrid allows researchers
    to focus on the earthquake engineering challenges
    at hand
  • The goal of the System Integrator (SI) is to
    develop NEESgrid as the Cyber Infrastructure that
    will facilitate this next generation of
    experimentation/simulation in earthquake
    engineering

4
The Grid in NEESgrid
Experimental Component
Grid Data Repository
Grid Operations Center
Campus Net Component
NEESgrid Component
Hub C
Hub A
Hub B
NEESpop A
Teleobservation Equipment
Experimental Equipment
Telepresence Equipment
Passive co-PI
Video I/O
Active PI
Data Cache
Audio I/O
Data Cache
Site A Experimental Data Producer
Site B Remote Lead Investigator
Site C Passive Collaborator
5
The Main Components of NEESgrid
  • Computational Simulation tools and interfaces
  • Uniform Telecontrol interface (equipment and
    simulation)
  • Uniform Streaming Data interface (equip. and
    simulation)
  • Data and Metadata services and Data Visualization
    tools
  • Data Acquisition (DAQ) and related services
  • Tele-Observation (remote viewing) services
  • Electronic Notebook capability
  • Remote Collaboration tools and services
  • Compatibility with (inter)national Grid
    standards, making NEESgrid potentially part of a
    much broader cyberinfrastructure

6
Status of NEES and NEESgrid
  • Three-pronged Construction Approach
  • 15 Major Facilities Development Awards
  • 1 System Integration (SI) Award (NEESgrid)
  • 1 Consortium Development Award to establish a
    team for ongoing maintenance
  • The SI Activity (NEESgrid) is both a development
    and a deployment effort not separated
    contractually.
  • June 2001 through September 2004
  • SI team and NEES Consortium are now engaged in
    transition of operations, to be completed in
    September 2004.

7
MOST ExperimentExperiment-based Development

8
What was the MOST Experiment?
  • A partnership between the SI Team, UIUC and
    Colorado Equipment Sites to showcase new (and
    previously developed) NEESgrid capabilities
  • A large-scale experiment conducted in multiple
    geographical locations. Combining physical
    experiments with numerical simulation in an
    interchangeable manner
  • The first integration of NEESgrid services with
    application software developed by Earthquake
    Engineers (UIUC, Colorado and USC) to support a
    real EE experiment
  • Demonstrated how collaborative designs can be
    realized by teams of IT professionals and
    earthquake engineers

9
Scientific Rationale
  • Scientists currently use testing, analysis, and
    field observations in their work.
  • Each method has strengths and weaknesses.
  • Field observations are considered useful mainly
    for validating theories resulting from testing
    and analysis.
  • The MOST Experiments combination of distributed
    pseudodynamic testing and finite element analysis
    seems ideal for large-scale experiments.
  • Pseudodynamic testing involves online,
    computer-controlled testing of real physical
    structures in laboratory conditions using applied
    forces.
  • This class of experiment is generally too large
    to be conducted in any single U.S. laboratory.

10
Test Structure for MOST Experiment
Note for ease of programming, all computational
models are Matlab-based for this exercise.
Why This Experiment?
Because we already knew the answer!
11
Primary Capabilities Demonstrated by MOST
  • The NCTP telecontrol service used with both
    physical and simulation components, including an
    interchangeable back-end control interface
  • Streaming data (Colorado site) and video
    monitoring
  • Collaboration interface (especially chat room and
    data viewer)
  • Data collection and storage

12
Telecontrol Using NTCP
UIUC Experimental Model
U. Colorado Experimental Model
ExperimentController(NTCP Client)
Each NTCP service is configured with
asite-specific plug-ininterface to the
localequipment/code.
NCSA Computational Model
13
1. Simple Computation/Control Model
UIUC Computational Model
U. Colorado Computational Model
SIMULATION COORDINATOR
NCSA Computational Model
14
2. Switch to NTCP Protocol
UIUC Computational Model
U. Colorado Computational Model
EXPERIMENT COORDINATOR (NTCP Client)
NCSA Computational Model
15
3. Switch One Site to Physical Mode
UIUC Experimental Model
EXPERIMENT COORDINATOR (NTCP Client)
NCSA Computational Model
16
4. Two Physical Sites (MOST)
UIUC Experimental Model
U. Colorado Experimental Model
EXPERIMENTCOORDINATOR(NTCP Client)
NCSA Computational Model
17
Data Collection
  • Local Data Acquisition (DAQ) system collects data
    from sensors and provides time-stamped data.
  • NEESgrid components transfer data to local
    repository (archival storage) and provide NSDS
    (streaming data) interface.
  • Local system is virtualized by services
    interfaces on NEESPOP.

18
Feedback from Users
  • Remote participants (those observing through the
    Web) need explicit orientation.
  • Communication items (narration/status, chat)
  • Documentation items (for both experiment setup
    and NEESgrid features)
  • The Web interface is all most people will see.
  • The rest of the system just works.
  • Dont expect comments on infrastructure
    experiment observers care mainly about the user
    interface, not the infrastructure.

19
Lessons Learned by the SI Team
  • Fault-tolerance is important.
  • Both the NTCP and the data management services
    experienced faults during the MOST experiment.
    Automatic recovery is critical.
  • Video of work areas should focus on the
    experiment.
  • All sites must meet NEES specifications to ensure
    satisfactory performance.
  • NTTP (clock syncing), network requirements, etc.

20
Two Important Lessons
  • Developing standardized tools and resources
    allows the Earthquake Engineer to focus on the
    engineering problem at hand.
  • Using common tools leverages resources and
    experiences.
  • While a number of potential improvements have
    been identified, it was clear that the basic
    system worked for the MOST experiment.
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