eng Science and Education Publishing International Journal of Physics 2333-4576 2017-02-18 5 1 21 29 10.12691/ijp-5-1-4 IJP2017514 article Yaser Sharifi 1 Hassan Ghassemi 1 Hamid Zanganeh gasemi@aut.ac.ir 1 Department of Maritime Engineerin, Amirkabir University of Technology, Tehran, Iran Fluctuating fuel prices and stricter emissions regulations levied by IMO are the leading factors influencing the maritime shipping industry over the past few years and made shipping companies, charterers and ship owners find ways to reduce and optimize fuel consumption. So it is very crucial to reduce bunker consumption and it can be considered from two points of views: reducing consumption by optimizing the ship construction such as hull, propeller and rudder of the ships or by reducing the operational costs of the ships through controlling the speed, optimizing routes and so on. Present paper is evaluating these two approaches about the reduction of the fuel consumption. http://pubs.sciepub.com/ijp/5/1/4/ijp-5-1-4.pdf fuel consumption energy saving innovative techniques