nshryh mhndsy dryPub Date : 2020-04-01DOI: 10.29252/marineeng.16.31.123
Majid Askary Sayar, Abolfath Askarian khob, Karim Akbari Vakil Abadi, H. Ghassemi
{"title":"The Seakeeping Investigation of an Inverted Bow Hull by Experimental Method","authors":"Majid Askary Sayar, Abolfath Askarian khob, Karim Akbari Vakil Abadi, H. Ghassemi","doi":"10.29252/marineeng.16.31.123","DOIUrl":"https://doi.org/10.29252/marineeng.16.31.123","url":null,"abstract":"This paper investigates the heave and pitch motion responses of an inverted bow hull. The experimental data were obtained from seakeeping tests with two scaled models of reference fishing vessel NA8-14 BSRA. The bow shape of the models is redesigned by inverted shape in two angles of 45 and 60 degrees. Several tests were conducted on the models at different speeds of 0.6, 0.9, and 1.2.m/s. Generated waves in the towing tank are of the regular type with the wavelength changing from 0.6L to 1.6L by an increment of 0.2L m. The amplitude of the waves was equal to either 35 mm. The heave and pitch response amplitude operator (RAO) versus no dimensional frequencies are presented. The investigations demonstrated that by decreasing inversion angle of bow to 45 degrees motions of the model improved. The results also showed that the interactions between the motions responses leads to the frequent appearance of “Kinks” in a coupled form with the responses of other motions .","PeriodicalId":33555,"journal":{"name":"nshryh mhndsy dry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47764404","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}
nshryh mhndsy dryPub Date : 2020-04-01DOI: 10.29252/marineeng.16.31.95
Mohamadreza Negahdari, H. Dalayeli, M. Moghadas, H. Ghassemi, Taghi Aliakbari
{"title":"Modeling and testing of the point absorber system to convert Sea Wave Energy into electrical energy","authors":"Mohamadreza Negahdari, H. Dalayeli, M. Moghadas, H. Ghassemi, Taghi Aliakbari","doi":"10.29252/marineeng.16.31.95","DOIUrl":"https://doi.org/10.29252/marineeng.16.31.95","url":null,"abstract":"Sea waves are an important source of environmental energy which can be converted into energy needed for different purposes. In current study, a floating-point absorber (FPA) wave energy converter is simulated, built, and tested. The system is modeled through a two-body system with two degrees of freedom in the heave direction. Modeling hydrodynamic system has been done in ANSYS-AQWA software. In order to obtain the resonance condition and the maximum power of the system, the values of the hydraulic parameters were determined based on optimal PTO coefficients. The experimental data was used to validate the results presented in this paper.","PeriodicalId":33555,"journal":{"name":"nshryh mhndsy dry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48903434","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}