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Experimental investigation on response and efficiency of moored pontoon type floating breakwaters
, Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 31, Issue 1 , 2007 , Pages 95-99 ; 03601307 (ISSN) ; Akbari, M ; Sharif University of Technology
2007
Abstract
This paper presents the experimental results of an investigation on the response and efficiency of floating pontoon type breakwaters. Random waves modeled by the Pierson Moskowits wave spectrum are used for various configurations of floating breakwaters. The experimental results are presented in graphs for the transmission coefficient as a function of incident wave length and height for breakwaters used in this study. The obtained results for the breakwaters of this study show that by increasing the wave period and length, the transmission coefficient increases, while increase in the mass and draft of the floating breakwater causes the transmission coefficient to reduce. © Shiraz University
The Optimal Catenary Mooring Arrangement for Least Sensitivity to Single Mooring Line Broken in Semi-Submersible Platform
, M.Sc. Thesis Sharif University of Technology ; Tabeshpour, Mohammad Reza (Supervisor)
Abstract
The discovery of oil and gas resources in deep waters led to the invention of various platforms adapted to these waters. As the search for oil and gas resources is advanced to deep water, it is impossible to use fixed platforms in these depths. Hence, the idea of using floating platforms that can be used in deep waters has been increasingly considered. An option for the exploration and extraction of offshore oil resources is semi-submersible platforms. Under wave, wind, and current forces, a floating structure moves from its initial location. Types of mooring systems are used to maintain the position of the platform. During the life of a platform, mooring lines may be damaged under...
A machine learning approach for material classification in MMW imaging systems based on frequency spectra
, Article Proceedings - IEEE International Symposium on Circuits and Systems ; Volume 2018-May , 2018 ; 02714310 (ISSN); 9781538648810 (ISBN) ; Abbasi, M ; Habiban, A ; Shabany, M ; Kavehvash, Z ; IEEE; IEEE Circuits and Systems (CAS) Society ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
In this paper, a new approach toward material detection and classification, based on the spectral analysis of millimeter-wave images, using machine learning technique is proposed. The focus of this paper is to detect concealed dangerous materials. It is shown that by using adequate number of training data captured from different materials of interest, the trained machine could detect concealed dangerous materials with an acceptable accuracy. The training phase is performed with materials of varying thickness, shape, background, covering layers and distance. The training data is collected with laboratory experiments in the frequency range of 27-31 GHz with 51 frequency samples. The results...
Analysis and Design of a Mooring System for Floating PV Power Plant
, M.Sc. Thesis Sharif University of Technology ; Khorasanchi, Mahdi (Supervisor) ; Abbaspour Tehrani Fard, Majid (Co-Supervisor)
Abstract
For the stability of floating solar PV power plants against environmental forces and the safety of operators during maintenance and repair, the mooring system ought to be designed based on the position of the plant, the size of the plant, and weather conditions. Floating solar PV power plants are mostly located in reservoirs with significant water level variations, or in some cases in inland seas where changes in water level are the most important challenge in their mooring system. In this project, different methods to overcome the water level variations have been studied and finally, a creative idea which covers the weaknesses of previous ones has been represented. By using programming...
The optimum mooring configuration with minimum sensitivity to removing a mooring line for a semi-submersible platform
, Article Applied Ocean Research ; Volume 114 , 2021 ; 01411187 (ISSN) ; Seyed Abbasian, S. M. R ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Mooring lines may be damaged under severe conditions during the life of an offshore platform. In the event of a mooring failure, it is possible to break remaining mooring lines in a severe condition, which ultimately leads to the total structural failure; Therefore, the post-failure analysis is very important for the mooring system. In this study, the Amir-Kabir semi-submersible platform has been modeled which is installed in 700 m’ depth of the Caspian Sea, and random waves have been generated towards the structure in the form of the JONSWAP wave spectrum according to the conditions of the Caspian Sea. For analysis, four different mooring configurations have been considered. Then, in each...