Day 2 Thu, August 12, 2010最新文献

{"title":"NSWCCD Maneuvering and Seakeeping Basin (MASK) Wavemaker Fabrication and Installation","authors":"D. Hackenberg, R. Harper, Robert Ferrara, Jeff Goldhammer, Matthew T. Rea, Doug Rogers, J. Perry, Rick Gilbert","doi":"10.5957/attc-2010-020","DOIUrl":"https://doi.org/10.5957/attc-2010-020","url":null,"abstract":"The design, and ongoing development and fabrication of a new segmented flap-type wavemaker array and associated powering, monitoring, control, and safety systems for the Naval Surface Warfare Center, Carderock Division’s (NSWCCD) Maneuvering and Seakeeping Basin (MASK) represents a major technological improvement to the existing wave generation capabilities at the facility. The new wavemaker, comprised of 216 individual wave boards configured as a dry-backed continuous array, incorporates a robust modular electromechanical design, with both position and force-based absorption feedback capabilities, and uses a programmable computer-based wave generation, monitoring, control, and visualization system. An industry technical team comprised of six different companies, in collaboration with NSWCCD facilities and hydrodynamic engineers and scientists have completed detailed design analyses and documentation. This high-visibility program draws on broad technical disciplines including mechanical, electrical, ocean, civil, construction, corrosion, computer, and software engineering expertise, as well as program management and administrative support.\u0000 The completion of final design documentation, using both 2- and 3-dimensional drawing and modeling techniques, has led to the next phase of system development involving the fabrication, assembly, and design validation of subsystem and component level prototype hardware as well as the fabrication and assembly of long-lead production hardware. Ongoing work includes the off-site fabrication of all mechanical subsystems and components; electric drive, monitoring, communications and control electronics and enclosures; and definition of wavemaker-to-basin mounting structures and the physical interfaces necessary to install the wavemaker system. The size and scope of this project is significant, both in terms of design effort as well as material and fabrication requirements. For example, the finished MASK Basin wavemaker installation will include over 80 tons of stainless and galvanized structural steel, over 65,000 pounds of reinforced fiberglass and over 500 cubic yards (50 truck loads) of poured concrete to support the new wavemaker structures. This paper provides an overview of the wavemaker system design/build process and a current status on the fabrication and assembly of all major system components. Specific topics discussed include:\u0000 The review and status of overall manufacturing plans and fabrication/ installation schedules.\u0000 The development of detailed design, manufacturing, and assembly drawings, and fabrication and QA procedures.\u0000 Materials qualification and selection considerations to meet operational life and maintenance requirements.\u0000 The lay-up, fabrication, and finishing of large-scale reinforced fiberglass wave paddles.\u0000 Laser cutting and machining of stainless steel mechanical components.\u0000 Prototype mechanical hardware fabrication and fitment validation.\u0000 The assembly of production quantity hardwar","PeriodicalId":173537,"journal":{"name":"Day 2 Thu, August 12, 2010","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130042718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The History of the Naval Academy Hydromechanics Laboratory (NAHL)","authors":"Bruce Johnson, J. Zseleczky","doi":"10.5957/attc-2010-024","DOIUrl":"https://doi.org/10.5957/attc-2010-024","url":null,"abstract":"The history of the U. S. Naval Academy Hydromechanics Laboratories in Isherwood Hall and in Rickover Hall is documented in this paper. The Rickover Hall Hydromechanics Laboratory dedication ceremony took place during the 18th ATTC in Annapolis in 1977. The design/development of the laboratory is discussed and education and research activities are summarized. Further details are recorded in the Appendices that are available as a companion CD to the printed proceedings of this conference.","PeriodicalId":173537,"journal":{"name":"Day 2 Thu, August 12, 2010","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124935150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scaling the Roughness of Submarine Non-Skid Coatings","authors":"Young T. Shen, D. Hess","doi":"10.5957/attc-2010-015","DOIUrl":"https://doi.org/10.5957/attc-2010-015","url":null,"abstract":"A portion of the upper deck surface of a submarine can be coated with roughness for crew safety when walking on the hull. The roughness factor for the non-skid coating on a full scale submarine is very large, on the order of 400 under typical ship operation conditions. Boundary layer development, flow separation, cross flow drag, hull surface pressure, and ship motion may be modified by the presence of this coating during turning maneuvers.\u0000 Free-running model submarines (FRM) are routinely employed by the Naval Surface Warfare Center to characterize submarine maneuvering behavior, and the application of an appropriately sized non-skid coating to the model is required for fidelity of model maneuvering experiments. Three methods to scale the coating have been investigated, and conventional geometric scaling and wall shear velocity scaling methods were found to be inadequate.\u0000 A new scaling method termed the momentum boundary layer thickness (MBLT) method has been developed. This method relates the cross flow drag on the FRM with that on the full scale vehicle. Boundary layer velocity profiles on an axisymmetric body at model and full scale Reynolds numbers have been computed by a RANS code. Velocity profiles encountered by the full scale non-skid coating are found to match well with those developed on the FRM with roughness sized using the MBLT method. The scaled roughness size compares favorably with two empirically determined roughness sizes that have been previously used on FRM models that have shown good correlation with full scale maneuvering data.","PeriodicalId":173537,"journal":{"name":"Day 2 Thu, August 12, 2010","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115147281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}