Harold E. Saunders Maneuvering and Seakeeping (MASK) Facility New Directional Wavemaker
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1 Harold E. Saunders Maneuvering and Seakeeping (MASK) Facility New Directional Wavemaker Scott Carpenter Dan D. Hayden John G. Hoyt III
2 Maneuvering And Seakeeping Basin MASK Wavemaker was a long process with many contributors!!! 2
3 Maneuvering And Seakeeping Basin MASK Wavemaker was a long process with many contributors!!! 3
4 Maneuvering And Seakeeping Basin MASK Wavemaker was a long process with many contributors!!! 4
5 Maneuvering And Seakeeping Basin MASK Wavemaker was a long process with many contributors!!! 5
6 Maneuvering And Seakeeping Basin MASK Wavemaker was a long process with many contributors!!! 6
7 Acknowledgements Carderock Wavemaker Replacement Advocates Maritime Technology Alliance Commanders and Technical Directors Naval Architecture and Engineering Department Government Wavemaker Team Facilities Division Seakeeping Division Contracting Officials and Financial Managers Contractor Wavemaker Team MAR (Prime Contractor Coordination, Engineering Leadership) Edinburgh Designs Limited (Wavemaker Designer) Atlantic Industrial Technologies (Machinery Fabrication and Engineering Design) INCON (Installation of Machine and Structural and Electrical Support Components) McLaren Associates (Design and Inspection of Concrete Support Structure) Wavemaker was a long process with many contributors!!! 7
8 General Agenda History of Wavemakers at Naval Surface Warfare Center, Carderock Division (NSWCCD) Need For Replacement EDL Design Design, Demolition and Installation Wavemaker performance and wave environment modeling Commissioning and characterization Future work and benefit to NAVY and Marine Industry Benefits of new wavemakers 8
9 Adm. David W. Taylor 9
10 Capt. Harold E. Saunders 10
11 History of NSWCCD Wavemakers Experimental Model Basin at Navy Yard actually had a wavemaker in 1920 s. 11
12 History of NSWCCD Wavemakers Cont d Plans for Maneuvering and Seakeeping Facility (MASK) developed in 1950 s 12
13 History of NSWCCD Wavemakers Cont d Original Towing Basin did not include wavemakers Some pneumatic concepts tested at smaller scales, in anticipation of adding that capability to the large towing basins 13
14 History of NSWCCD Wavemakers Cont d The early 1950 s saw the installation of wavemakers in the towing basins 14
15 History of NSWCCD Wavemakers Cont d Plans for Maneuvering and Seakeeping Facility (MASK) included a model tank to evaluate the new design before manufacture 15
16 History of NSWCCD Wavemakers Pneumatic wavemaker chosen due to lower maintenance Original design called for single shaft both banks Final 1961 MASK had valves on short bank and single shaft long bank Single long shaft on long bank allowed skewing Refurbishment of domes and valves performed in mid 1980 s 16
17 Wavemaker Replacement Process EG&G Independent Analysis (June 2005 to August 2006) Review of cost and technologies Required to provide background information for Congressional funding White Paper NAVY s need for new wavemaker (Dec/Jan 2006) Frequency response Ability to produce lower sea state for littoral efforts Ability to produce non-orthogonal bidirectional seaway Development of Specifications and Statement of Work (2006/2007) Seaport Contract to support multi-year funding (2007) Contract Award September 2007 Majority of funding was provided via congressional plus ups Final funding provided via NAVSEA 17
18 Replacement Wavemaker General Theory 2.5 m (8.2 ft.) hinge depth 0.658m (25.9 in.) pitch (centerline to centerline spacing) Dry back wavemaker Paddle driven with timing belt on sector Motor and pulley box mounted above Hydrostatic compensation with air tank and bellows Force feedback (absorption) control 18
19 Replacement Wavemaker General Theory Cont d Pulley Box Drive Arrangement 19
20 Replacement Wavemaker General Theory Bellows and Lower Force Transducer Arrangement 20
21 Design Cycle, Fabrication and Quality Control Contracting Team provided preliminary design via proposal Contracting and Government teamed to discuss more specifics Contractor and Government Design Team observed previous EDL design Contractor Team worked through greater details to create final design Government and Contracting Team reviewed design Team worked together to review design and approve parts for fabrication Drawings and concepts were corrected and altered as required Long lead items were procured Contractor performed quality control check throughout fabrication Paddle impact test Tank and bellows testing Measurement jigs Multi paddle mockup at AIT Gusset fitment Cabinet burn In with motors 21
22 Demolition and Installation Carderock Pre-Install Activities Determination and routing of 13.8KVa feeds and step down supplied power Laydown areas and safety Draining of Water and Demolition Draining basin, pressure equalization, dewatering Removal of 21 pneumatic domes and other associated wavemaker components Installation Support Structure Concrete shelves, hinge mounts, motor frames (with motor pulley boxes) Installation Major Mechanical and Electrical Components Tank and bellows, paddles and sectors, gussets, electrical distribution and control cabinets Maintenance and Safety Components Caisson rail and pocket, catwalks, railings Leak mitigation and final adjustments Time-lapse Installation Video 22
23 Wavemaker Environment Modeling Wave Height or Significant Height (cm) Regular Waves (1/10 Steepness Limited) " " (Power/Stroke-limited) Hs, Random (Low Steepness) " " (Moderate Steepness: Pierson-Moskowitz) " " (High Steepness) 10 Regular wave production Irregular wave production Directional wave production Period or Modal Period (sec) Short crested vs. long crested seaway (spreading) Deterministic wave events Focused wave events Wavemaker Capabilities Video 23
24 Wavemaker Environment Modeling Preprogrammed Spectral Shapes Bretschneider, Pierson-Moskowitz, ITTC, JONSWAP (Hs, Tp, and gamma as appropriate) Can Specify and Vary Spectral Heading, Spreading, and Random Phasing Customizable spectral shape and wave front definition Other Spectral Shapes Can Be Specified via Coordinates Wavemaker can also be programmed via wave fronts (Spectral ordinate, frequency, phase) Wavemaker Visualization Software of Spread Spectra and Long Crested Spectra at 70 Degree Separation Spread Spectra and Long Crested Spectra at 70 Degree Separation 24
25 Correcting MASK Spectra For Wave Breaking When testing in higher sea-states breaking can be prevalent Breaking limits ability to achieve the desired wave conditions NSWCCD developed methodology to correct the target reducing the breaking while maintaining Hs and Tp Allows meaningful testing in steep storm-type sea-states Spectrum Correction for a Bi-directional Sea Spectral Correction 25
26 Commissioning and Characterization Wavemaker commissioning Individual component checks Bringing full system up to full operation Tuning of all components Verification that machine meets performance specification Acceptance of wavemaker delivery Wavemaker characterization How does the machine operate within the seakeeping basin What are specifics of how to use the machine in the seakeeping basin How can the facility best use the new machine to meet testing needs Characterization will be a continuing process Some commissioning and characterization overlap 26
27 Future Work and Benefits Non-orthogonal bi-directional seaways Short crested seaways Better machine control Greater capability and control at high frequencies High performance craft scaling flexibility Deterministic seaway testing Wave energy conversion testing Multi-vessel testing Littoral capabilities 27
28 New Wavemakers In Towing Basin Design to be on movable shelf Can move down to operate basin in shallow water mode Possible surf testing in high speed basin Ability to absorb some wake for calm water testing? Ability to time frequencies for shorter wait times? 28
29 Questions For more informa+on regarding capabili+es, scheduling, and availability, please contact: Jon F. Etxegoien Head, Naval Architecture and Engineering Department Naval Surface Warfare Center, Carderock Division 29
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