Sharif Digital Repository

Due to the suitable performance characteristics and the widespread use of Surface Piercing Propellers (SPPs) in high-speed crafts, many experiments and numerical studies have been conducted in this field. Due to the lack of a comprehensive series similar to conventional propellers in the field of SPPs, in this thesis, it has been tried to personalize the suitable basis by conducting two separate experimental tests in the National Iranian Maritime Laboratory (NIMALA) towing tank and the cavitation tunnel at Sharif University using computational fluid dynamics method and the commercial code STAR-CCM+. For this purpose, a wide range of phenomena and effective parameters on hydrodynamic... 

Surface piercing propellers are particular type of supercavitating propellers that are commonly used for High-speed vessels. Most studies on this type of propellers has been investigating the hydrodynamic forces. But in recent years with increase in SPPs diameter used in vessels, structural analysis of this type of propellers is considered. For this purpose, studies on the stresses exerted on the propeller structures under load is done with the help of Hydro elastic methods. In this type of analysis, structura of propeller is intended to be flexible and Displacements under pressure checked and Tensions resulting from it are studied.
The present Thesis using ANSYS software to analyze a... 

Partially submerged propellers are new type of propellers which general knowledge regard them is limited. These propellers found a growing market ahead of them and experts expect to use these propellers for big vessels at high speeds. This type of propulsors do not lose their efficiencies at high speeds and are assumed to be economical. Meanwhile, due to continuous hit to the water surface, huge stresses are exerted on the blades which needs to be fundamentally studied. Several researchers have studied the partially submerged propellers which unfortunately did not publish their results. Therefore, it is necessary to study several aspects of partially submerged propellers. Due to growing... 

Partially submerged propellers are new type of propellers which knowledges ragard them is limited. These propellers found a growing market ahead of them and expertsexpect to use these propellers for big vessels at high speeds. This type of propulsors do not lose their efficiences at high speeds and are assumped to be economical. Meanwhile due to continuosus hit to water surface, huge stresses are extered on tha blade witch needs to be fundamentally studied. Several researchers have studied the partially submerged propellers which unfortunately did not publish their results. Undergo less or more thrust and torques which in both cases the efficiency also increases. The use of numerical methods... 

Fault detection and diagnostics of rotating machinery are considered one of the most important issues. Propulsion system, power generator motor, shaft couplings and transmissions system prepare trust necessary to move the high speed craft. Vibration measurement, control and obtain the critical velocity and dynamic forces on bearings and joints is one of the most important issues in this case. In this project dynamic modeling of surface piercing system was analyzed which this system has ability to change trim and steering angles by hydraulic cylinder. Dynamic modeling regard to the driving forces of surface piercing propeller modes of in different operation state is performed. At the end,...