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Reverse engineering often involves taking something apart and analyzing its workings in detail to be used in maintenance or to try to make a new product or component that does the same thing without copying anything from the original. In order to understand the existing design, materials and manufacturing process of a motorcycle chain and also for the future direction in new materials with new design, a comprehensive study on the reverse engineering is essential. Therefore, in this paper, a systematic study on a motorcycle chain reverse engineering is performed. The two types of motorcycle chains (Chain A and Chain B) were destructed and investigated using the metallurgical microscope and hardness tester for microstructural and microhardness examination purposes respectively. It was found that the Chain A showed tempered martensite structure (in the case) with higher hardness value compared to Chain B. The cost analysis of the new proposed motorcycle chain is also given in this paper.

Air-conditioning system is an integrated part of the ship design and plays an important role in providing comfortable and healthy cabin environment for crews, passengers and also ensuring efficient thermal management in electrical compartments encompassing IT equipment and computer systems. Understanding the temperature and velocity distribution and the redistribution of cold air to electrical compartments could greatly improve energy efficiency, necessary for thermal management and ensuring reliable operation. To this end, optimized design of a cabin air distribution system is a necessary aspect of the cabin air conditioning system. Computational fluid dynamics (CFD) is an excellent modeling tool that can be used in the design process to simulate thermal performance of the mechanical systems. In this paper, CFD simulation is utilized to analyze the thermal behavior of a warship electrical compartment to pinpoint the cooling issues. Steady state simulations are conducted by employing a Cartesian grid and the standard turbulence k-ε model and grid dependency tests are performed with respect to cabin exhaust temperature. Temperature field and flow pattern of a compartment will be studied to cast a light on the compartment cooling issues.