Transcript CCLI_ICEER11.ppt

An Internet-based Educational
Platform for Earthquake Engineering
Laboratory Experiments
Chencheng Wu, Le Yu, Shirley J. Dyke,
Christopher Beeler and Jian Ouyang
Purdue University
iCEER 2011
Belfast, Ireland
Earthquakes Worldwide
Eastern US Earthquake (August 24th 2011)
Introduction
• Earthquake simulator tables, or shake tables, are used
for experimental research in earthquake engineering.
• This equipment is capable of reproducing the motion of
the ground during an earthquake, allowing for controlled
testing of structures subjected to earthquakes.
• New concepts and techniques are often tested on scaled
structures using shake tables before implementation.
• Bench-scale shake tables offer an ideal mechanism to
provide students access to such “hands-on”
experiments.
NEES
•3435 registered NEEShub users and thousands of NEES users of equipment sites and cyberinfrastructure at
any point in time highlight the global reach of NEES.
•NEES Sites
•NEEScomm
• Data Repository
• Computational
Simulation
• Community
Support
•University of
Minnesota
•University of
Illinois
•University
at Buffalo
•Cornell
University
•Lehigh
University
•University of
California, Davis
•Rensselaer
Polytechnic Institute
•University of •University of California,
Texas
Los Angeles
•University of
California, Berkeley
•University of
Nevada, Reno
•Oregon State
University
•UC Santa
Barbara
•UC San
Diego
Introduction
Existing state-of-the-art cyberinfrastructure
tools developed by NEESit, the technical
support and development component of
NEES, have been developed recently for
teleparticipation and teleoperation.
We have been able to take advantage of
these capabilities to educate the
next generation of civil engineers!
Outline
• Objectives of the Collaboratory
• Lab Station Components
• Instructional Materials Available
– Freshman Level Undergraduate Module
– Senior Level Structural Dynamics Experiments
• Evaluation of the Program
• Closing
Objectives of the Collaboratory
• To provide engineering students
– an understanding of structural dynamics
– experience with modern laboratory equipment
and instrumentation
– exposure to NEES and the latest capabilities
regarding remote testing teleparticipation
tools
– provide a mechanism for training students to
perform experiments
– broader access to such tools
– opportunities for K-12 outreach
Objectives of the Collaboratory
• 2 Lead Institutions
– develop 2 initial exercises
– evaluation & adapt
• 5 Deployment Sites
– implement 2 exercise
– develop new exercises
• Available to users
Lab Station: Overview
System Architecture
UCIST Shake Table
UCIST PC
(LabVIEW Machine)
Remote PC
Teleoperation
Control Panel
•Port =
8090
TCP Server
Control Server
CompactRIO
•TCP
RDV
DAQ Daemon
UCIST LabVEW
Server
RBNB Server
NI- DAQ
•Port =
3333
Data Turbine PC
Axis Web
Camera
UCIST Shake Table
•CompactRIO 9516
12
Remote PC - Teleoperation Control
Panel
Remote PC - Teleoperation Control Panel
14
UCIST PC Teleoperation
• TCP server
Remote PC
– Listen on port 8090
– Receive commands from remote PC
• Simulation pattern
• Excitation parameters (eg. Amplitude & Frequency) •Commands
• Simulation duration
UCIST
– Send commands to and receive feedbacks
from Control Server
• Control server
– Receive commands from TCP Server
– Generate excitations according to simulation
pattern and parameters (eg. Sinusoidal )
– Move Shake Table with generated excitations
PC
TCP Server
Control Server
UCIST Shake
Table
15
RBNB Server
16
Introduction to Earthquake
Engineering
Freshman Engineering
module developed at the
University of Connecticut
Instructional Materials
• Students learn necessary mathematics to
study the forced and free vibration of a
single-degree-of-freedom structure
• A 1-story seismically excited shear frame
is used to apply their new knowledge
Instructional Materials
• Overview (Freshman Level 3 weeks)
– Earthquake Engineering Introduction
– SDOF Equations of Motion
– Programming in Matlab
– NEES Introduction
– Teleparticipation & Teleoperation of Actual
Experiment
• Each student is required to submit weekly
homeworks and a final lab report including
a discussion of observations and results
Two Experiments Developed for
Structural Dynamics
Senior/Grad Level
Experiments developed at
Purdue University
Instructional Materials
• EXPERIMENT 2: Design Vibration Absorber
– Two DOF building model
– Passive device to reduce responses
– Design length of pendulum and additional mass
– Verify control results using teleoperation
Lab Station: Activities
University of California, Berkeley
Model Shake--Aftermath
Evaluation Program
• Evaluation & Feedback
– On-line surveys conducted to obtain student
and faculty input
– Evaluation expert is part of the project
• 12 undergraduate engineering courses at
5 universities over the course of four
years; total of 505 students surveyed
Evaluation Program
• Goals
1. Describe classroom implementation of virtual laboratory
2. Estimate the impact of virtual experiments on student learning
3. Describe associations between gender and patterns in learning
• Comments
– “[It] Was very hands on, and many people learn better
by doing and seeing than just calculations”
– “It was a very interesting experience. The fact that you
could manipulate a structure in another building across
campus from you room is amazing.”
Benefits to the Students
• More flexible and complex experiments
using multiple sites
• Experience with cyberinfrastructure
• Flexible scheduling of experiments
• Access for students at a larger number of
universities to participate in advanced
experiments
Implications for Engineering Educators
• Provide opportunities for students worldwide to
use tele-operated shake tables for learning
• Review resources at NEES and UCIST
• Think creatively about student experiences in
your classroom, especially the extent to which
men and women may perceive differences in
their abilities that may contribute to differential
rates of pursuit of further engineering education.
Acknowledgments
• NSF DUE 0618605 and 1058462 (CCLI)
• NEESinc and NEESit
• NSF funding for UCIST (1998-2002)
– Support for UCIST from NSF Grant (DUE
9950340)
– Mid-America Earthquake Center
• Quanser Consulting
2020 Vision Report
• January 26-27, 2010
• Identify the major strategic
directions for the future
of earthquake
engineering research
and education
http://nees.org
For more information see:
http://engineering.purdue.edu/ucist
and
http://nees.org/