Pub Date : 2020-04-01DOI: 10.29252/marineeng.16.31.123
Majid Askary Sayar, Abolfath Askarian khob, Karim Akbari Vakil Abadi, H. Ghassemi
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 .
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Pub Date : 2020-04-01DOI: 10.29252/marineeng.16.31.29
Aerfeh Emami, Ahmad Reza Mostafa Gharabaghi
:هلاقم هچخیرات :هلاقم تفایرد خیرات 07 / 07 / 1398 :هلاقم شریذپ خیرات 17 / 01 / 1399 یارب س کی هندب داعبا هنیهب یحارط یوک همین یشور ،قورغم تسا زاین باوج هک فادها اب ار هنیهب یاه رد یصخشم هاتوک یتابساحم نامز دروآ تسدب . هعلاطم نیا یفرعم هب لا یوجتسج متیروگ هکبش یا هب تروص عبات هس هفده اب ا ده ا ف لقادح ندرک شهاک ،نزو و ویه تاکرح چیپ همین یوکس هندب قورغم یم دزادرپ . یارب نم نیا ،روظ تلاداعم ادتبا ،هندب نزو کرح ا چیپ و ویه ت وکس نیا هب تروص یرتماراپ عباوت هتسسگ ندش .د غتم ی اهر دش هتفرگ رظن رد قورغم همین یوکس یارب یحارط دویق و . سپس متیروگلا قوف هب تروص هفده کت فده اب شهاک نزو همین هندب قورغم و دش هتشون نآ ییاراک اب هسیاقم جیاتن تاعلاطم نیشیپ دش یسررب . رد ،همادا متیروگلا ج یوجتس هکبش ا ی هب تروص اوت عب هفده هس دش هداد هعسوت و باوج رد ار یلوبق لباق یاه هاتوک .داد ناشن یتابساحم نامز نیرت یم ناشن هعلاطم نیا هک دهد متیروگلا یوجتسج هکبش یا راکهار کی هنیهب یارب بسانم هدوب هفده دنچ یزاس و م ی اوت دن حارط هب ی داصتقا ی دمآراک و رت اهوکس رت ی روانش کمک .دنک تاملک :یدیلک قورغم همین هب ی هن زاس ی هکبش یوجتسج یا عباوت هفدهدنچ تاکرح خساپ
慈善机构中的氦十六进制差异07/07/1398：氦警长慈善机构17/01/1399 Jabb Hindi Dabba Hyahb Ihar Yakhart Yuk，同一个国家，燕子，Tessa Zain，Boj Hexadeci Water Ahmed Hyahb，或以下Itabassah Yakham的冰盖。هعرعمنیا；اباقورغ。不不不不。然后大都会，十七件外套的树干的屋顶，不要射杀水受害者，不要把他们带回印度。红十字会，红十字会，朱庇特的霍比特人，Oth Ab Hesse，黑森州的黑森人，红十字，Yahtoc河的铁十字，称为铁十字。十七个丹麦人和十七天的民主党人起义，红鹰，心理帮助，丹克，马利克，迪格尔克，希比霍克，约格赛德，阿布瓦特十七塔克。
{"title":"Introducing a simple and reliable multi-objective optimization method to estimate hull dimensions of a semi-submersible rig","authors":"Aerfeh Emami, Ahmad Reza Mostafa Gharabaghi","doi":"10.29252/marineeng.16.31.29","DOIUrl":"https://doi.org/10.29252/marineeng.16.31.29","url":null,"abstract":":هلاقم هچخیرات :هلاقم تفایرد خیرات 07 / 07 / 1398 :هلاقم شریذپ خیرات 17 / 01 / 1399 یارب س کی هندب داعبا هنیهب یحارط یوک همین یشور ،قورغم تسا زاین باوج هک فادها اب ار هنیهب یاه رد یصخشم هاتوک یتابساحم نامز دروآ تسدب . هعلاطم نیا یفرعم هب لا یوجتسج متیروگ هکبش یا هب تروص عبات هس هفده اب ا ده ا ف لقادح ندرک شهاک ،نزو و ویه تاکرح چیپ همین یوکس هندب قورغم یم دزادرپ . یارب نم نیا ،روظ تلاداعم ادتبا ،هندب نزو کرح ا چیپ و ویه ت وکس نیا هب تروص یرتماراپ عباوت هتسسگ ندش .د غتم ی اهر دش هتفرگ رظن رد قورغم همین یوکس یارب یحارط دویق و . سپس متیروگلا قوف هب تروص هفده کت فده اب شهاک نزو همین هندب قورغم و دش هتشون نآ ییاراک اب هسیاقم جیاتن تاعلاطم نیشیپ دش یسررب . رد ،همادا متیروگلا ج یوجتس هکبش ا ی هب تروص اوت عب هفده هس دش هداد هعسوت و باوج رد ار یلوبق لباق یاه هاتوک .داد ناشن یتابساحم نامز نیرت یم ناشن هعلاطم نیا هک دهد متیروگلا یوجتسج هکبش یا راکهار کی هنیهب یارب بسانم هدوب هفده دنچ یزاس و م ی اوت دن حارط هب ی داصتقا ی دمآراک و رت اهوکس رت ی روانش کمک .دنک تاملک :یدیلک قورغم همین هب ی هن زاس ی هکبش یوجتسج یا عباوت هفدهدنچ تاکرح خساپ","PeriodicalId":33555,"journal":{"name":"nshryh mhndsy dry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49212944","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}
Pub Date : 2020-04-01DOI: 10.29252/marineeng.16.31.95
Mohamadreza Negahdari, H. Dalayeli, M. Moghadas, H. Ghassemi, Taghi Aliakbari
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.
{"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":null,"pages":null},"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}
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