Pub Date : 2012-03-16DOI: 10.1111/j.1559-3584.2010.00265.x
ROBERT LATORRE, JULIO 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":"ROBERT LATORRE, JULIO 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":"<p>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.</p>","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"123 4","pages":"81-89"},"PeriodicalIF":0.2,"publicationDate":"2012-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1559-3584.2010.00265.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72319252","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 : 2012-03-16DOI: 10.1111/j.1559-3584.2012.00349.x
Mr Ronald K. Kiss
{"title":"PRESIDENT'S PAGE","authors":"Mr Ronald K. Kiss","doi":"10.1111/j.1559-3584.2012.00349.x","DOIUrl":"https://doi.org/10.1111/j.1559-3584.2012.00349.x","url":null,"abstract":"","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"123 4","pages":"5-7"},"PeriodicalIF":0.2,"publicationDate":"2012-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1559-3584.2012.00349.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72319248","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 : 2012-03-16DOI: 10.1111/j.1559-3584.2011.00193.x
KENT R. DAVEY, HOWARD E. JORDAN, RIGOBERTO J. RODRIGUEZ, ROBERT E. HEBNER
The deleterious effect of full bridge rectifiers on the output of an AC generator deserves attention from the Naval community. The harmonics observed at the stator of the generator not only introduce hysteresis and eddy current losses, but voltage spikes that impact the life of the generator. The two primary factors compromising life are localized heating due to harmonics and voltage spikes that cause insulation failure through partial discharge. Induced eddy currents are proportional to frequency squared.
{"title":"Generator Life and Power Electronics","authors":"KENT R. DAVEY, HOWARD E. JORDAN, RIGOBERTO J. RODRIGUEZ, ROBERT E. HEBNER","doi":"10.1111/j.1559-3584.2011.00193.x","DOIUrl":"https://doi.org/10.1111/j.1559-3584.2011.00193.x","url":null,"abstract":"<p>The deleterious effect of full bridge rectifiers on the output of an AC generator deserves attention from the Naval community. The harmonics observed at the stator of the generator not only introduce hysteresis and eddy current losses, but voltage spikes that impact the life of the generator. The two primary factors compromising life are localized heating due to harmonics and voltage spikes that cause insulation failure through partial discharge. Induced eddy currents are proportional to frequency squared.</p>","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"123 4","pages":"31-39"},"PeriodicalIF":0.2,"publicationDate":"2012-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1559-3584.2011.00193.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72319309","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 : 2012-03-16DOI: 10.1111/j.1559-3584.2012.00350_5.x
MR. CRAIG L. FLYNN
{"title":"THE FRANK C. JONES AWARD","authors":"MR. CRAIG L.\u0000 FLYNN","doi":"10.1111/j.1559-3584.2012.00350_5.x","DOIUrl":"https://doi.org/10.1111/j.1559-3584.2012.00350_5.x","url":null,"abstract":"","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"123 4","pages":"20-21"},"PeriodicalIF":0.2,"publicationDate":"2012-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1559-3584.2012.00350_5.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72319316","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 : 2012-03-16DOI: 10.1111/j.1559-3584.2010.00264.x
RANDY MARTENS, MARK REMPEL
Defense organizations within many nations (e.g., United States and Canada), use capability-based planning (CBP) to guide their force development processes. A key element of the CBP process is testing current and proposed capabilities against force planning scenarios, particularly for asset evaluation. This analysis involves a wide range of capabilities, and thus is a multicriteria problem. Comparison of alternatives using multiple criteria is challenging, and often is assisted by aggregation techniques. Set in a naval context, this paper presents three high-level capability aggregation techniques: the vector method, star plot method, and wedge method. Each method aggregates naval task group capabilities, with respect to a scenario, into three quantifiable measures: effectiveness, unmatched, and unused. As with numerous techniques, the effectiveness gauges the ability of a task group to meet a set of scenario requirements. The unmatched and unused measures yield insight into capability gaps, which is an important aspect of CBP. The unmatched metric measures scenario requirements that are not provided by a task group and the unused metric measures task group capabilities that are not required by a scenario. An application of the methods is presented, including a discussion of their strengths and weaknesses. Based on this work, it is concluded that the vector method is the best of the three presented.
{"title":"High-Level Methodologies to Evaluate Naval Task Groups","authors":"RANDY MARTENS, MARK REMPEL","doi":"10.1111/j.1559-3584.2010.00264.x","DOIUrl":"https://doi.org/10.1111/j.1559-3584.2010.00264.x","url":null,"abstract":"<p>Defense organizations within many nations (e.g., United States and Canada), use capability-based planning (CBP) to guide their force development processes. A key element of the CBP process is testing current and proposed capabilities against force planning scenarios, particularly for asset evaluation. This analysis involves a wide range of capabilities, and thus is a multicriteria problem. Comparison of alternatives using multiple criteria is challenging, and often is assisted by aggregation techniques. Set in a naval context, this paper presents three high-level capability aggregation techniques: the vector method, star plot method, and wedge method. Each method aggregates naval task group capabilities, with respect to a scenario, into three quantifiable measures: effectiveness, unmatched, and unused. As with numerous techniques, the effectiveness gauges the ability of a task group to meet a set of scenario requirements. The unmatched and unused measures yield insight into capability gaps, which is an important aspect of CBP. The unmatched metric measures scenario requirements that are not provided by a task group and the unused metric measures task group capabilities that are not required by a scenario. An application of the methods is presented, including a discussion of their strengths and weaknesses. Based on this work, it is concluded that the vector method is the best of the three presented.</p>","PeriodicalId":49775,"journal":{"name":"Naval Engineers Journal","volume":"123 4","pages":"67-80"},"PeriodicalIF":0.2,"publicationDate":"2012-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1559-3584.2010.00264.x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72319253","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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