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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