UC Davis1

A NEES Geotechnical

Centrifuge Facility at Davishttp://cgm.engr.ucdavis.edu/NEES/nees.html

UC Davis2

Components of project• Speed upgrade - to 80 g• Advanced Instrumentation - subcontracts to develop 8-

channel sensor managers and to investigate feasibility of wireless communication underground.

• Robot - in flight testing, construction and inspection

• New building - 4200 ft2 of new space

• Shaker upgrades - biaxial shaker

• Geophysical testing

• Display wall/numerical simulation

UC Davis3

UCD NEES Advisory Board

• Tarek Abdoun, Abbas Abghari, JP Bardet, Po Lam, Dave McCallen, Jack Moehle, Paul Van Laak

• First meeting September 13, 2001 – Three board members attended physically

– Two members attended by polycom

• Project status and other presentations from EAB meeting are posted at:– http://cgm.engr.ucdavis.edu/NEES/eab/eab.html

UC Davis4

Questions for SI, CD, NSF

• NEESpop– Where does it fit in our LAN?– Who pays for it?– What are the specs?

• Clarification of responsibilities of– NSF, Equipment sites, SI, and CD

• Who is responsible to make sure that the SI system fits with the equipment sites and the whole NEES works together?

UC Davis5

Question for Equipment Sites

• Can we share hardware and software design, development and maintenance costs?

– Data Acquisition Systems– LAN hardware and software– NEES Software (visualization, telepresence)– Expertise of people at certain sites may be helpful

to other sites

UC Davis6

Solid model of UCD centrifuge

UC Davis7

Streamline room

SPEED UPGRADE

New Bearings

New Gear Box

UC Davis8

UC

D C

entr

ifuge

Rob

ot

UC Davis9

Geophysical Methodsin the Centrifuge:

At GaTechMaterial property characterization. High resolution ELM Needle probeSemi-reflective multiple layers for GPR-based monitoringS-wave imaging

At UC-DavisELM Needle probe implementation in centrifuge modelsP-waves/ultrasound: validation with medical devicesDevelopment of internal ELM sourcesInitial implementation of resistivity tomography

UC Davis10

Bia

xial

Sha

ker

ABAQUS analysis in progress

- safety issues

- performance

issues

NEESgrid support for analysis is appreciated.

UC Davis11

sensor manager

sensor

•Process•buffer•transmit

SDI 1010x

+/- 200g

0 – 2500 Hz

data concentrator

RESDAQ PCWireless

transceiver Wired

data concentrator

custom communicationserial

communication

PXI w/ A/D

conventional transducers

custom communication

All data synchronized

UC Davis12

Wireless concepts (Now focussing on A and B, C seems not optimal due to transmitter/battery size, D is more related to Geophysical

Testing component of our NEES project)