sstl apss09 student shm competition 7/13/2009 shinae jang
TRANSCRIPT
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Student SHM competition
7/13/2009
Shinae Jang
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Purpose
Comprehensive understanding of the smart SHM technology
Wireless sensor and softwareISHM toolsuite
Experimental modal analysis
Field experiments
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Goals
Software installationTinyOS installationISHM toolsuite installation
Data measurement on two in-use pedestrian bridges
Modal analysis parameterOptimal sensor location to obtain better mode shapesData acquisition parameters: fs, Nfft, …Output-only system id using either NExT/ERA or FDD
Formal presentation
* Detailed tasks are listed in the ‘Lab and Competition’ guide
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Evaluation guideline
AccuracyComparison with reference results
Software installation and operation
Optimal sensor locationEngineering insight
Expertise in modal analysisAppropriate sensing and DAQ parameters
Discussion
Presentation
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(1) Wireless sensor
SensorBase station node:
USB cable, debug board, imote2 with external antenna
Sensing nodes:Battery boards, imote2, SHMa sensorboardsIn total 4 sets will be provided for each group
When can we use?Wireless sensor labTuesday afternoon ~ Wednesday afternoon
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Sensing nodes
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(2) Software installation
TinyOS installation (Done)
ISHM toolsuite installationVersion 1.3.1
One or more laptop should be prepared for the competition
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(3) TestbedsSuspension bridge (Lake of the Woods)
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Free vibration tests
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(4) TestbedsMahomet Bridge
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Mounting
Use modeling clay between gray weight and the wood plank
Laptop
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Jumping
Straight kneesStraight knees Bent kneesBent knees
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(4) Test arrangement
Mahomet bridgeSpan on the Sangamon River
: Groups 1, 4 (11)Span on the grass
: Groups 3, 6, 7 (17)Assistants: Shinae, Hongki, Ryan, Brian P
Suspension bridgeGroups 2, 5, 8 (17)Assistants: Han, Robin, Chia-Ming
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Note
Groups should coordinate with other groups on the same span for the testing time planning
One jumping at a time
Other people should be out of bridge not to induce excessive human damping on the bridge
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(5) Ride arrangement
Mahomet BridgeWednesday 8:30AM at North gate of Newmark Lab.These groups should move to the Lake of the Woods park after data measurement for the picnic.
Suspension bridgeWednesday 9:00AM at North gate of Newmark Lab.
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(6) Presentation
Many pictures and figures
Everyone should take a role and work together
List the individual roles
Suggested roles are listed in ‘Field vibration test using wireless sensors’ guide
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Wireless sensor lab announcement
Practice the SHM competitionWireless sensor usage (H/W and S/W)
Modal analysis lab with wireless setupRandom Vibration and Impact hammer tests
With your own parameters
1st session: 9:45AM – 12:45PM
2nd session: 1:45PM – 4:45PM