NetSLab Based Remote Hybrid Testing in A Hierarchical Network Environment

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NetSLab Based Remote Hybrid Testing in
AHierarchical Network Environment

• Yu-rong Guo1, Yan Xiao2 and Qing Hu3

• Hunan University, China
• University of Southern California
• FutureNet Corporation, Monrovia, California

Fourth NEES Annual Meeting Washington DC June
21-23, 2006
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Outline

• 1. Intrduction
• 2. NetSLab (Networked Structural Laboratories)
  development
• 3. Application of NetSLab
• 4. Concluding remarks

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1. Introduction

• Collaborative research/test

• NEES (Network for Earthquake Engineering
  Simulation, USA)
• ISEE (Internet-based Simulation for Earthquake
  Engineering, Taiwan)
• E-Defence (Japan)
• KOCED (Korea Construction Engineering Development
  program, Korea)
• BLADE (Bristol Laboratory for Advanced Dynamic
  Engineering,UK)
• ELSA (The European Laboratory for Structural
  Assessment)

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• NetSLab (Networked Structural Laboratories)

Other institutes
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Communication platform
NetSLab
Application development
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Hierarchical Network Environment




LAN
Public IP
Internet



Public IP
LAN
Direct point-to-point connection
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CERNET
National Network Center Regional Network
Centers Provincial Network Centers City Network
Center
(China Education and Research Network)
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2. NetSLab (Networked Structural Laboratories )
Development

• 2.1 Basic Features of NetSLab

• Client/Server concept
• Socket based communication mechanism
• Generalized data model

• Testing results
• Three types of participants
• Communication protocols

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Controller

Tester
Observer
Observer
Testing results
Tester


Observer
Tester

Observer
Tester

Observer
Tester

Three types of participants

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Communication protocols
Controller
Tester1
Tester2
Tester3
Centralized sequential communication protocol
Controller
Tester1
Tester2
Tester3
Centralized parallel communication protocol
Controller
Tester1
Tester2
Tester3
Distributed parallel communication protocol
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2.2 Implementation of NetSLab

• Dynamic Unified Data Packet (DUDP)

ltDUDPgt ltCommunicationgt (1)Control
information lt/Communicationgt
ltCurTestResultgt (2)Testing data
lt/CurTestResultgt lt/DUDPgt
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Generalized Data Communication Agency (GDCA)
DUDP
Tester1
DUDP
Controller
Tester2
DUDP
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GDCA interface ActiveX control
GDCA Design and maintenance
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2.3 Across firewall/proxy communication
Public IP
Controller PC
Simulation of global structure
Port 80
Firewall
Firewall
LAN
LAN
Private IP
Private IP
Tester PC 1
Tester PC 2
Loading facilities
Physical Tester
Virtual Tester
Simulation of substructure
Test of substructure
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Private IP
Public IP
Controller PC
Communication Server PC
LAN
Simulation of global structure
Port 80
Internet
Firewall
Firewall
LAN
LAN
Private IP
Private IP
Tester PC 1
Tester PC 2
Loading facilities
Physical Tester
Virtual Tester
Simulation of substructure
Test of substructure
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3. Application of NetSLab for Remote hybrid
Dynamic Testing
3.1 Testing program development
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Main interface of testing program
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3.2 Actual testing using NetSLab
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3.3 Communication efficiency
T Average time spent on Internet communication
for a round trip data transfer between two
computers
T 0.0250.03s within University of Southern
California(USC) T 0.3s between the Hunan
University (HNU) and USC T 0.550.6s between HNU
and Los Angeles using dialup connection
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4. Concluding Remarks

• A network communication platform (NetSLab) was
  developed for remote hybrid dynamic testing of
  structures, which provides relatively easier and
  friendlier interface for application development
  and across multi-level proxy and firewall
  communication capability.
• The adequacy and efficiency of the NetSLab
  platform was validated by several remote virtual
  and actual tests at and between two universities
  in the US and China.

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Acknowledgments
The authors would like to express their
appreciations to the support of the National
Natural Science Foundation of China (NSFC) under
the National Key Project (Grant No. 50338020)
FutureNet Technologies Corporation, Monrovia,
California, USA and its China subsidiary division
provided supports under an agreement for joint
development, academic promotion and applications.

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Thank you
Hunan University
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(No Transcript)
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USC/HNU
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USC/Waterloo,Canada T0.11s
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USC/Shuzhou,China T0.23s