SSTL APSS09 Student SHM competition 7/13/2009 Shinae Jang.

APSS09APSS09SSTLSSTL

Student SHM competition

7/13/2009

Shinae Jang


Purpose

Comprehensive understanding of the smart SHM technology

Wireless sensor and softwareISHM toolsuite

Experimental modal analysis

Field experiments


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


Evaluation guideline

AccuracyComparison with reference results

Software installation and operation

Optimal sensor locationEngineering insight

Expertise in modal analysisAppropriate sensing and DAQ parameters

Discussion

Presentation


(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


Sensing nodes


(2) Software installation

TinyOS installation (Done)

ISHM toolsuite installationVersion 1.3.1

One or more laptop should be prepared for the competition


(3) TestbedsSuspension bridge (Lake of the Woods)


Free vibration tests


(4) TestbedsMahomet Bridge


Mounting

Use modeling clay between gray weight and the wood plank

Laptop


Jumping

Straight kneesStraight knees Bent kneesBent knees


(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


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


(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.


(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


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

SSTL APSS09 Student SHM competition 7/13/2009 Shinae Jang.

Documents

Transcript of SSTL APSS09 Student SHM competition 7/13/2009 Shinae Jang.