الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 202 |  |  |
| | | from | 202 | | |
Abstract
Preliminary ship design is a major stage of ship design. Naval architects are usually overwhelmed by the number of decisions they should take in this stage to satisfy the requirements of all the stakeholders including ship owners, regulatory bodies such as IMO, builders, etc. One of these decisions is the estimation of a good starting set of ship design parameters that achieve not only ship mission and owner’s vision but also the highest mechanical, navigational, economic and environmental performance.The third phase of the Energy Efficiency Design Index (EEDI) regulations, which came into force in 2022, states that new ships should reduce their emissions by at least 30% compared to the minimum energy efficiency level (EEDI baseline) set by the IMO’s MEPC in 2013.Apart from its vital role in decarbonizing the global fleet and improving the transportation efficiency, the EEDI that is considered herein is basically a measure of a vessel’s mechanical performance and, secondarily, pollution reduction. A simplified EEDI (SEEDI) is used to judge designs from methodical design series in order to identify all possible efficient designs and to select the best starting set of design parameters at the preliminary stage of ship design. A MATLAB code was employed to iterate over all practical ranges of hull and propeller parameters to extract complete designs from methodical hull design and propeller series. In addition, by using the code together with an abstract form of the EEDI equation (SEEDI), a good initial set of hull form and propulsion parameters that lead to a reduced SEEDI, could be realized. The generated set relates well to ship owners’ requirements without dispensing with marine environmental regulations and also without using the costly marine innovative energy technologies. All possible methods of manipulating form and propulsion parameters that might lead to reducing the SEEDI were investigated and the reductions in the SEEDI were quantified. On the other hand, this research tool was also employed to generate sets of design parameters that could replace existing ships’ design parameters within the practical and economical ranges of the non-dimensional ratios and form coefficients known from experience and methodical series limits. Consequently, a reduced EEDI could be achieved using the new method for existing ships that were built after the new marine pollution regulations were enforced. Compared to the use of energy saving devices and slow steaming, significant reductions (up to 25%) in the SEEDI have been achieved after applying the proposed method.