Pub Date : 2020-11-01DOI: 10.29252/MARINEENG.16.32.131
Saeed Soheili, Poorya Ghasemizadeh, E. Hosseini
of marine propulsion shafting system may bring serious problems and many efforts have been performed to mitigate theses vibrations. Propeller oscillations due to the small variations of thrust, when the propeller blades rotate through the non-uniform wake, result in the longitudinal vibrations in the propulsion shafting system. These oscillations can be transmitted to the hull through the thrust bearing of the vessel. In this study, the propulsion shafting system is modeled with the decomposition of FRF method. The comparison between the numerical solution of system in MATLAB Simulink software, and the decomposition of FRF method; shows that the numerical solution has less 4 percent error. In order to decrease the transmitted vibrations to the hull, Goodwin Resonance Changer (RC) is utilized. An optimization method is used to optimize the RC’s stiffness, damping and mass coefficients . The results show that if the appropriate coefficients are selected, the transmitted vibrations can be reduced up to 99 percent in the hull.
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毁灭，毁灭慈善，毁灭10/1399，毁灭31/06/1399，毁灭之母和地球之母的荣誉毁灭，恐怖之主，天堂之主，上帝之主，地球之主，大马士革国王。河流的主人。Daza Hydra Hydra六岁的Talf Valley，在那里，你的去世将让我们想起Hedrau国王的Lord Hedrau的激情，以及Hedra国王的LordHedrau英雄的命运Nedra的命运是曼哈顿大屠杀之主，K.s.印度参议员Hedra激情之主，不另行说明。例如，Hedra的百人之主、Hedra之激情之主、Hedra之热情之主、the Lord of Hedra’s passive、the Lord's Hedra‘s passive，the Lord for Hedra‘'s passive、the Lord of Hedra’'s passive，the Lord for Hedra的激情之主。دن。恐怖的金十字架、Hijrd河、Hijrah河、Junp河、Long Jupiter、Gang之主、Lady Red之主，将庆祝Mann King Rap城17周年、北冰洋东半部的第十六个四分之一、恐怖的后半部分、恐怖的下半部分。它很有趣。Ritha Ninchum。这是对Idaza、Tajik Shiazfa、Lord Drew Yahorin、Helshah Giatan、Hobb-Habb、Hobb-habb和Machinas阵雨的Gehrum Yahorin历史的重大威胁。这没什么大不了的。这是一场黑暗的风暴。我打算每天吃六码的杜松子酒。Diyelk Tamalek、Roa Tolph、Ganymede Namla、Samonid Damascus、Genemike Haldamam。
{"title":"Evaluation of Seasonal Effects and degrees of freedom on Dynamic Response and Impact Forces on Leg Mating Unit in Persian Gulf","authors":"Erfan Arabshahy, M. Kasaeyan, N. Shabakhty","doi":"10.29252/MARINEENG.16.32.85","DOIUrl":"https://doi.org/10.29252/MARINEENG.16.32.85","url":null,"abstract":":هلاقم هچخیرات تفایرد خیرات :هلاقم 10 / 04 / 1399 :هلاقم شریذپ خیرات 31 / 06 / 1399 ا ی ن د خساپ هلاقم ی مان ی ک ی ن و ی اهور ی م ناملا رب هدراو ی ت ی گن ارب ی ارش ی ط وج ی لخ ی ج لاس لصف راهچ رد سراف ار سررب ی م ی لدم .دنک ی ارب ی دازآ هجرد شش اب روا تولف بصن ی د خساپ ات تسا هدش هداد هعسوت ی مان ی ک ی ن و ی اهور ی رب هدراو م ناملا ی ت ی گن گ هبرض شقن هک ی ر ارب ار ی ن هدراو تابرض شا ی ا ار هشرع و روانش تاکرح زا ی اف م ی .دوش هدروآ تسدب ،دنک د خساپ ندروآ تسدب رب هولاع ی مان ی ک ی سناکرف هنماد رد هشرع و روانش ی ، ن ی اهور ی م ناملا رب هدراو ی ت ی گن نامز هنماد رد ی .تسا هدش هدروآ تسدب ا ی ن ن ی اهور ارب ی راذگراب ی 100 دصرد ی ارب ی ارش ی ط حم ی ط ی ا هدمآ تسدب توافتم دن . ن ی اهور ی رد هدراو هس یلاقتنا یدازآ هجرد ارب ی رات ی هچخ نامز ی جنپ قد ی هق ا ی م ناملا رب ی ت ی گن لدم رد .دنا هدش هبساحم ه ی دورد ی مان ی ک ی رپ ،هصخشم جوم عافترا ی دو اهرتماراپ ناونع هب داب تهج و تعرس ،جوم ی دورو ی دندش هتفرگ رظن رد . رثا نینچمه .دش هدید گنیروم یاهورین تارییغت رد یدازآ تاجرد شیازفا رب دراو یاهورین زا هلصاح جیاتن هب هجوت اب هب و دوش ماجنا ناتسبات لصف رد بصن نیا ،اهورین تارییغت ندوب رتمک لیلد هب دوش یم داهنشیپ گنیتیم یاه ناملا هورین یلامتحا یاطخ ای و دح زا شیب یحارط زا یریگولج روظنم دنوش هبساحم هجرد شش ره رد گنیروم یا . :یدیلک تاملک وکس بصن روا تولف گنیتیم ناملا یکمانید خساپ زنیماک هلداعم","PeriodicalId":33555,"journal":{"name":"nshryh mhndsy dry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69862787","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 : 2020-04-10DOI: 10.29252/MARINEENG.16.31.109
صادق فاضل, ناصر پریز
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