Pub Date : 2011-12-01DOI: 10.1111/J.1559-3584.2010.00265.X
R. Latorre, Julio C Arana
Amphibious vehicles and other blunt-shaped floating vehicles encounter the problem of a large bow wave forming at high speeds. This wave formation is accompanied by higher resistance and at a critical speed results in bow submergence or swamping. A 1/4 scale model of a tracked amphibious vehicle was tested at speeds corresponding to 3–7 km/h full scale to investigate the phenomena. The experiment showed that at speeds of 5–6 km/h, there is a significant increase in the trim by the bow. The vehicle's “breakwater” plate was able to break up this wave and avoid swamping. Comparative tests with the vehicle fitted with the wave cancellation bow plate showed that this bow plate reduced the bow wave formation and achieved a 10% reduction in the towing resistance. The wave cancellation bow plate can reduce the vehicle's power and extend its amphibious operating range or increase its amphibious speed.
{"title":"Reduction of Amphibious Vehicle Resistance and Bow Swamping by Fitting a Wave Cancellation Bow Plate","authors":"R. Latorre, Julio C Arana","doi":"10.1111/J.1559-3584.2010.00265.X","DOIUrl":"https://doi.org/10.1111/J.1559-3584.2010.00265.X","url":null,"abstract":"Amphibious vehicles and other blunt-shaped floating vehicles encounter the problem of a large bow wave forming at high speeds. This wave formation is accompanied by higher resistance and at a critical speed results in bow submergence or swamping. A 1/4 scale model of a tracked amphibious vehicle was tested at speeds corresponding to 3–7 km/h full scale to investigate the phenomena. The experiment showed that at speeds of 5–6 km/h, there is a significant increase in the trim by the bow. The vehicle's “breakwater” plate was able to break up this wave and avoid swamping. Comparative tests with the vehicle fitted with the wave cancellation bow plate showed that this bow plate reduced the bow wave formation and achieved a 10% reduction in the towing resistance. The wave cancellation bow plate can reduce the vehicle's power and extend its amphibious operating range or increase its amphibious speed.","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"62 20","pages":"81-89"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72611926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1111/J.1559-3584.2012.00350_3.X
J. Filling
{"title":"THE FRANK G. LAW AWARD","authors":"J. Filling","doi":"10.1111/J.1559-3584.2012.00350_3.X","DOIUrl":"https://doi.org/10.1111/J.1559-3584.2012.00350_3.X","url":null,"abstract":"","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"28 1","pages":"15-17"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74554522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1111/j.1559-3584.2012.00350.x
J. J. Hough
{"title":"THE GOLD MEDAL AWARD","authors":"J. J. Hough","doi":"10.1111/j.1559-3584.2012.00350.x","DOIUrl":"https://doi.org/10.1111/j.1559-3584.2012.00350.x","url":null,"abstract":"","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"3 1","pages":"8-9"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78992808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1111/J.1559-3584.2009.00228.X
M. Campbell, John Krempasky, M. Bosworth
This paper will examine the Global Fleet Station (GFS) concept, first proposed in the Naval Operations Concept 2006 and implemented since then through a variety of US Navy (USN) and US Coast Guard (USCG) humanitarian assistance and foreign military training cruises. First, we will explore GFS missions, and the capability and materiel requirements that are derived from them. Next, relying on lessons learned from recent USN and USCG GFS and GFS-type cruises, and preliminary analysis of 20 US and foreign vessels potentially suitable for GFS missions, this paper will argue that to effectively implement GFS in a persistent, distributed, and affordable manner, greater attention must be given to ships specially built or modified for the mission, complemented by dual-use legacy ships used as necessary in augmentation roles. It is important to recognize that emerging GFS requirements differ greatly from requirements for ships built for major combat operations, but that the resulting cost savings actually make this a cost-effective and operationally effective trade-off for the USN.
{"title":"A Persistent, Effective, and Affordable Global Fleet Station Concept","authors":"M. Campbell, John Krempasky, M. Bosworth","doi":"10.1111/J.1559-3584.2009.00228.X","DOIUrl":"https://doi.org/10.1111/J.1559-3584.2009.00228.X","url":null,"abstract":"This paper will examine the Global Fleet Station (GFS) concept, first proposed in the Naval Operations Concept 2006 and implemented since then through a variety of US Navy (USN) and US Coast Guard (USCG) humanitarian assistance and foreign military training cruises. First, we will explore GFS missions, and the capability and materiel requirements that are derived from them. Next, relying on lessons learned from recent USN and USCG GFS and GFS-type cruises, and preliminary analysis of 20 US and foreign vessels potentially suitable for GFS missions, this paper will argue that to effectively implement GFS in a persistent, distributed, and affordable manner, greater attention must be given to ships specially built or modified for the mission, complemented by dual-use legacy ships used as necessary in augmentation roles. It is important to recognize that emerging GFS requirements differ greatly from requirements for ships built for major combat operations, but that the resulting cost savings actually make this a cost-effective and operationally effective trade-off for the USN.","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"143 1","pages":"51-66"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76633458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1111/J.1559-3584.2011.00337.X
R. Millar, D. Olwell
An earlier nonparametric statistical study of GE F414 engine removals from operational F/A-18 aircraft in US Navy service provided insights into the lifetime patterns of engine removals for various causes. Inspection of the estimated hazard function for engine removals for foreign object damage (FOD) suggested that a parametric analysis using Erlang distributions might be fruitful, bolstered by a hypothesized relevance to the maintenance procedures governing engine removals for this cause, and their outcomes. The objective was both a better model to forecast engine removals and to provide insight into the number of FOD incidents it took to drive an engine removal. Gamma and Erlang distributions did better fit the removals data and provide a tool for predicting engine removals, aircraft availability impact, and the resultant maintenance workload. A parametric model using a cascade of Erlang functions was developed to simulate the combined FOD/line maintenance process, which provides insight into the outcomes expected under reasonable simplifying assumptions. This model predicts that the key research issue, the probability that a typical FOD event prompts a removal, cannot be estimated from engine removals data alone. Field data must be collected to gain understanding of the underlying frequency of FOD and the utility of the present inspection criteria.
{"title":"Parametric Models for Aircraft Engine Removals Resulting from Foreign Object Damage","authors":"R. Millar, D. Olwell","doi":"10.1111/J.1559-3584.2011.00337.X","DOIUrl":"https://doi.org/10.1111/J.1559-3584.2011.00337.X","url":null,"abstract":"An earlier nonparametric statistical study of GE F414 engine removals from operational F/A-18 aircraft in US Navy service provided insights into the lifetime patterns of engine removals for various causes. Inspection of the estimated hazard function for engine removals for foreign object damage (FOD) suggested that a parametric analysis using Erlang distributions might be fruitful, bolstered by a hypothesized relevance to the maintenance procedures governing engine removals for this cause, and their outcomes. The objective was both a better model to forecast engine removals and to provide insight into the number of FOD incidents it took to drive an engine removal. Gamma and Erlang distributions did better fit the removals data and provide a tool for predicting engine removals, aircraft availability impact, and the resultant maintenance workload. A parametric model using a cascade of Erlang functions was developed to simulate the combined FOD/line maintenance process, which provides insight into the outcomes expected under reasonable simplifying assumptions. This model predicts that the key research issue, the probability that a typical FOD event prompts a removal, cannot be estimated from engine removals data alone. Field data must be collected to gain understanding of the underlying frequency of FOD and the utility of the present inspection criteria.","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"29 1","pages":"99-107"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87390882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1111/j.1559-3584.2012.00350_2.x
F. J. Harris
{"title":"THE HAROLD E. SAUNDERS AWARD","authors":"F. J. Harris","doi":"10.1111/j.1559-3584.2012.00350_2.x","DOIUrl":"https://doi.org/10.1111/j.1559-3584.2012.00350_2.x","url":null,"abstract":"","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"207 1","pages":"12-14"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80483473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1111/J.1559-3584.2010.00266.X
Charles Gallagher
In 1989, Ingalls Shipbuilding contracted to design and construct three Sa’ar V Class corvettes for the Government of Israel. The available funding was considerably less than would have been needed to design and build equivalent ships for the US Navy. As a result, the Israeli Navy (IN) and Ingalls Shipbuilding, working closely together, implemented significant innovative systems engineering and design practices and the ships were delivered within the budget. Some of the key innovative design and engineering methods used during that program are described in this paper.
{"title":"Combatant Ship Engineering, A Different Approach","authors":"Charles Gallagher","doi":"10.1111/J.1559-3584.2010.00266.X","DOIUrl":"https://doi.org/10.1111/J.1559-3584.2010.00266.X","url":null,"abstract":"In 1989, Ingalls Shipbuilding contracted to design and construct three Sa’ar V Class corvettes for the Government of Israel. The available funding was considerably less than would have been needed to design and build equivalent ships for the US Navy. As a result, the Israeli Navy (IN) and Ingalls Shipbuilding, working closely together, implemented significant innovative systems engineering and design practices and the ships were delivered within the budget. Some of the key innovative design and engineering methods used during that program are described in this paper.","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"17 1","pages":"91-98"},"PeriodicalIF":0.2,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73952375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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