University of Minnesota NSF George E. Brown, Jr. NEES Site Multiaxial Subassemblage Testing (MAST) System C. French, A. Schultz, J. Hajjar, C. Shield, R. Dexter Department of Civil Engineering D. Ernie Department of Electrical and Computer Engineering D. Du Department of Computer Science and Engineering
Overview of equipment proposal MAST system enables multi-axial cyclic static tests of large-scale structural subassemblages including portions of beam-column frame systems, walls, and bridge piers Stiff steel cruciform-shaped crosshead manipulated with 6 -DOF control technology enables control of a plane in space (can apply pure planar translations or gradients) System features mixed-mode control capabilities (each DOF may be controlled as either load or deformation) System features four vertical actuators capable of applying 5870 k. N (510 mm), and two sets of horizontal actuator pairs capable of applying 3910 k. N (400 mm) in orthogonal directions, and four ancillary actuators
Update on Project Status and Schedule • Construction of MAST Laboratory (new facility to house NEES equipment) to begin Jan 02. Schematics for facility completed and scheduled for presentation at October UMN Board of Regent’s meeting for final approval. • Hydraulic equipment and controller contract made to MTS 9/01. • Developing pool of candidates and interviewing for two technical research coordinators (having telepresence and hydraulics/mechanical specialties) • Project is on schedule; however, UMN milestone dates for receiving significant input from SI are approaching
MAST System Teleparticipation Infrastructure Campus Network Giga. Po. P Core Node Internet 2 Internet 1 Gigabit LAN Video Servers (2) Archiving & Visualization Server Still Image Servers (2) NEESPo. P MAST Controller Actuators Still Cameras (8) MAST System Video Cameras (8) Client PCs (2) Control & DAQ Server Control Sensors Measurement Sensors
Information for SI • Gigabit Ethernet Link available Jan 02 for beta testing on campus, Jan 03 for development within NEES facility • Telepresence expertise covered by three co-PIs from 3 depts. (Civ. E, Elec. E, and Comp. Sci) + research coordinator. Co-PIs have experience in streaming video, networking, multimedia computing, and teleparticipation • UMN site contains remotely controllable still cameras (8) and video cameras (8) with required transmission rates of 200 Mbits/sec, and ~200 data channels with required transmission rates of 20 Kbits/sec. Data synchronization is important. • Tests on specimens may take 24 -48 hours to completion. There may be pauses between load cycles for damage identification. • UMN schedule of information needed from SI: - By 12/01: specifications for all hardware, OS, and software - By 4/02: Beta versions of all SI software - By 9/02: Initial verified versions of all software
Information for SI (cont. ) UMN prioritization for functionality of MAST operations: • Local control of MAST system from Control and Data Acquisition Server • Local sensor data acquisition and temporary storage of information on Control and Data Acquisition Server • Archiving and retrieval of data after an experiment on Visualization and Archiving Server and at national repository • Teleobservation on Client Machine during an experiment • Rudimentary playback and visualization of an experiment on Visualization and Archiving server after experiment is completed • Teleoperation on Client Machine during an experiment • Sophisticated playback and visualization of an experiment on Visualization and Archiving server after an experiment is completed • Model-based simulation and integration of simulation with experiments
Questions for SI • What are expectations of SI of each individual equipment site? • How will expectations and needs of individual sites regarding telepresence/telecollaboration, data archival/management, and model-based simulation be integrated by SI? • With plan for 3 early adoptor sites, how will SI ensure that all sites are engaged, i. e. , have a voice in decisions/direction; benefit from learning/resources invested in development process; and do not lose precious time to completion? • As individual sites develop questions/needs, what expectations can sites have regarding responsiveness of SI? How should this communication be handled, from each individual site to SI or in coordinated fashion? Who is the appropriate contact (e. g. Tom Prudhomme)? • How much involvement will SI have in development of metadata protocols, hardware specifications/structure, software specifications/development, telepresence/telecollaboration, data archival/management, model-based simulation etc. ?
Information for CD Team • MAST system to be housed in new laboratory on campus w/in walking distance of department. Offices for visiting researchers elsewhere on campus. • On-site research coordinators will participate in all tests (this ensures safety, functionality, and efficiency) • Unique features of MAST include large force and stroke capacities and seamless 6 DOF control • MAST system can be used to investigate non-seismic research issues and industrial problems • UMN prefers long-term vision of hard-funded annual operation and maintenance costs. This would facilitate site scheduling and coordination (e. g. , if external researcher uses facility past predicted schedule, hard-funding will lessen impact on facility—researchers will not need to be requested to leave facility for funding considerations). This also helps planning for facility prior to determining which proposals will be funded to use facilities. • UMN has expectation for CD assistance with outreach activities and promotion of MAST facility
Questions for CD Team • • What are the expectations of CD for individual sites? What are CD short term goals (prior to site commissioning)? What is CD long term vision of management (after commissioning)? Short term questions: - Will CD have a role in determining issues such as the format for data archival and desirable features for telepresence? (CD can gather info from external user perspective. ) - Will CD facilitate/coordinate site task groups on common issues? - What does CD envision as its relationship with individual sites and SI in short term? - Will CD have or seek any funds for development of common resources/tools? • Long-term questions: - How will CD coordinate site scheduling, handle site operation and maintenance costs (hard-funded annually or from project to project), engage external users, integrate contract testing into research schedule, facilitate outreach and training, assess sites, help seek sources of research funding, coordinate proposals?
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