scholarly journals Stability assessment of "Zvezda" Shipbuilding Complex dry dock gate

Author(s):  
С.В. Антоненко ◽  
М.В. Китаев ◽  
А.А. Муратов ◽  
Р. Вигнеш ◽  
О.Э. Суров

В процессе проектирования сухого дока, строящегося в г. Большой Камень, у российских специалистов возникли расхождения с проектантами из КНР по вопросам обеспечения остойчивости батопорта и его балластировки. По мнению российской стороны, требование китайских норм к метацентрической высоте (не менее 1,0 м) является чрезмерно завышенным. Кроме того, представлялось желательным использовать постоянный жидкий балласт вместо твёрдого. К решению возникших вопросов были привлечены представители ДВФУ. В работе рассмотрены результаты оценки остойчивости батопорта при использовании твёрдого и жидкого постоянного балласта. Сопоставлены требования к остойчивости батопортов в Китае, Великобритании и Франции. Рассмотрена динамическая остойчивость батопорта, в том числе для случая рывка буксирного троса при отводе батопорта от дока с учётом требований российского регистра. Выполненные исследования были приняты во внимание при окончательном решении вопроса о типе постоянного балласта. The main object of Shipbuilding Complex "Zvezda" shipbuilding complex is a dry dock. The dry dock is located in Bolshoi Kamen city. There are some discrepancies between of Russian and Chinese engineers about the ballast type and stability of dry dock gate. As an example the Chinese stability requirement for metacentric height (at least 1.0 m) is considered as excessively high. In addition two types of dry dock gate ballasts (solid and liquid) were considered. The authors were involved in this research. In this paper we present the results of dry dock gate stability assessment for solid and liquid types of ballast. For this research the dry dock gate stability requirements of China, Great Britain and France standards were compared. The dynamic stability of dry dock gate was considered for the case of a tug rope tension with taking into account the requirements of the Russian register of shipping. The results of this research were taken into account as recommendations for design and construction of the dry dock gate.

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Hooi-Siang Kang ◽  
Moo Hyun Kim ◽  
Shankar S. Bhat Aramanadka

Abstract The development of a dry-tree semisubmersible (DTS), a new type offshore hydrocarbon production system, is facing unconventional challenges in the issues of dynamic stability, structural integrity, and parametric resonance. The Mathieu equation is used to assess the dynamic stability of a top-tensioned riser (TTR) in order to prevent the parametric resonance which leads to detrimental effects on structural integrity. The objectives of this paper are to (i) study a Mathieu stability diagram and its coefficients for an assessment of the stability of a TTR, (ii) identify the effects of the dynamic tension variations in the Mathieu stability assessment, and (iii) analyze the stability of the TTR on a DTS, which is equipped with a long-stroke tensioner, by using numerical simulation. The dynamic tension variation in the DTS was identified to induce instability in the TTR. Hence, the Mathieu stability assessment is recommended to be included in an analysis of TTR behaviors in a dry-tree interface of semisubmersibles.


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