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A Desktop Fast Hybrid Test Platform

This document outlines the development and configuration of a low-cost fast hybrid test (FHT) platform designed to facilitate rapid earthquake engineering simulations. The motivation behind this technology encompasses the need for quick experimentation, educational purposes, and research prototypes, addressing the challenges posed by large-scale production systems. The platform integrates simulation and physical testing through a compact hardware setup, achieving real-time interactions. Key configurations include LabView for control, various sensors for data acquisition, and a user-friendly graphical interface. Summary indicates future work in parallel computation and advanced modeling for enhanced performance.

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A Desktop Fast Hybrid Test Platform

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  1. A DesktopFast Hybrid TestPlatform Gary Haussmann, Ph.D. George E. Brown, Jr. Network for Earthquake Engineering Simulation http://nees.colorado.edu Phone: (303) 735-0302 Fax: (303) 492-7317 Gary.Haussmann@colorado.edu

  2. Outline • Background • Motivation and Goals • Hardware Configuration • Software Configuration • Summary and Conclusions

  3. Background • Terminology: • Hybrid test: combined simulation and physical interaction • Fast Hybrid: simulation runs at/near real-time • CU-Boulder NEES site has a production FHT system for large scale tests

  4. Motivation • A Need for Quick FHT Sessions • Demonstrations • Educational Projects • Research Prototypes • Full-scale production system is large and expensive • Long setup/breakdown times • Complex interaction of multiple hardware boxes • Prohibitive for quick experiments

  5. FHT Desktop Goals • Rapid deployment • Inexpensive • Accessible

  6. Shaking Table Hardware Configuration • Physical Specimen • Accessed via LabView • Simulation Computer • Real-time LabView OS • Simulation and network • Control Computer • Graphics and user interface Physical Specimen NI DAQ Simulation Computer with Real-time OS Ethernet Display and Control MS-Windows Computer

  7. Shaking Table 1 Hardware Configuration • Physical Specimen is controlled directly by DAQs • Actuator accepts command displacement • Load cell produces measured force • LVDT produces measured displacement Command Displacement Actuator Force Load Cell LVDT Displacement

  8. Shaking Table 2 Hardware Configuration • Simulation/Physical Interface • Consistent with production system • Simulation sends displacement to actuator • Simulation receives force and displacement • Data sent to separate control computer Command Displacement Actuator Force Ethernet Load Cell Simulation LVDT Displacement

  9. Shaking Table 3 Hardware Configuration • Control computer • Graphical display of simulation state • Information about instruments/physical state • GUI to control graphics and simulation Command Displacement Actuator Force Ethernet Load Cell Simulation Control/GUI LVDT Displacement

  10. Shaking Table Software Configuration • Three Key Processes: • Simulation • Network • Control Computer with Real-time OS MS-Windows Computer User Interface/ Display Process Ethernet Network Process Simulation Process Real-time Portion Physical Specimen

  11. Software Configuration • Simulation Process • Runs on simulation computer • Runs as a Real-time Process • C/C++ code DLL embedded into LabView • FE Framework Details • Implicit dynamics (Alpha method) • Nonlinear formulation; iterative solution • Hybrid simulation embedded in the iterative process

  12. Software Configuration • Hybrid Equations • Command displacement • Measured displacement • Measured force

  13. Software Configuration • Network Process • Runs on simulation computer • Runs as a non-real-time Process • Sends data to control computer • Sends Ethernet/IP/UDP datagrams at 30Hz rate • Network Module Details • C++ code to pack/unpack simulation state for networking

  14. Software Configuration • Display Process • Runs on control computer • Graphical display of most-recent known state • Asynchronous updates received from Network Process invoke display update • Display Platform Details • Object-oriented Graphics Rendering Engine (OGRE) • Full 3D, 60Hz display

  15. Summary & Conclusion • Low-cost Hybrid Test Platform Completed • Fast hybrid simulation • Multiple-DOF • Enables fast modification/prototyping • Planned use for incoming short course • Future work • Parallel computation • Continuum elements

  16. Demonstration

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