Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Blvd., West Bethesda, MD 20817-5700

99 -- SERVO-HYDRAULIC LOAD MACHINE TEST STATION SOL N00167-00-Q-0105 POC Hugh Harrison, (301)227-1123 The Structures and Composites Department, Code 65 of the Naval Surface Warfare Center, Carderock Division operates and maintains several servo-hydraulic load machine test stations and intends to procure a replacement for one of the current control systems. The existing equipment is comprised of four uni-axial load frames, and a multi-axial free-form test station. Each uni-axial test station has its own hydraulic power supply, hydraulic service manifold, and control electronics to conduct static and cyclic testing. The multi-axial free-form test station can accommodate four actuators through a four port service manifold and a single hydraulic power supply. Each test station is operated independently from the others with each actuator controlled in one of three modes: load (DC), stroke (AC/LVDT), or strain (DC). Although each system also contains a function generator, a computer and external electronics are used to generate a continuous command signal for constant and random amplitude fatigue loadings defined by peak and trough endpoints. This procurement focuses on a uni-axial test station having a 600 kip load capacity, a 12 inch stroke actuator, a 3-stage 50 gpm servo valve, service manifold and hydraulic power supply. The test station has a strain gage type canister load cell and an LVDT to measure actuator movement. The current test station controller has selectable load and stroke ranges with bumpless control mode switching. The control electronics reside in a room of wire path length no longer than 75 feet away from the test station. It is the intent of this procurement to obtain turn-key digital control electronics and software that separately control the single uni-axial test station. The control system must possess the following features and capabilities: 1. Digital Control Electronics 2. Microsoft windows platform environment 3. Closed-loop control of a servo-hydraulic uni-axial test station 4. Control modes of both load and stroke, upgradable to include strain control 5. Bumpless and on-the-fly (event) switching between any control modes 6. Monotonic and cyclic command waveform generation and control 7. Support constant, variable and external (user defined endpoints of at least 100,000) amplitude cyclic fatigue tests with mean level 8. Command signal and gain adaptive compensation to achieve desired feedback 9. Control of hydraulic power supply, service manifold and associated interlocks 10. Local control pad at the test station to aid in specimen installation 11. Support three stage servo-value 12. Data acquisition with at least 16 bit conversion, limit and error detection, ability to accept at least two external transducers in addition to load and actuator stroke 13. Buffered signal output jacks for load, stroke and strain feedback and command 14. Real time data acquisition displays and data compatibility with Microsoft Excel 15. Automatic and manual tuning to optimize control loop parameters 16. Standard and metric unit displays 17. Initial setup, installation and calibration of control system and test equipment included 18. Available on-line technical support 19. Available follow-on field service, repair and calibration services priced separately 20. Available training on-site and optional off-site 21. Software upgrades included 22. Versatile software configuration, expandable to independently control up to four uni-axial actuators or a multi-actuator free-form test station with a hydraulic power supply and hydraulic service manifold, using additional or different hardware. 23. List of items/equipment that may be supplied by customer separately and discounted from final price; for example computer 24. System, components and software must already exist; product literature required 25. User's manuals and documentation 26. References of similar retro-fit installations elsewhere 27. Y2K compliant Request for quotations will be tentatively issued on February 16, 2000. Interested parties may request a copy of the RFQ by faxing their request, NLT 15 February,2000., 5:00pm, to the above POC at 301-227-5784. No telephone requests will be honored. (see numbered Note 1) Posted 01/31/00 (W-SN420196). (0031)

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