Gear couplings are widely used as connecting elements that can allow axis displacements caused between two axes in compact size. The recent demands to gear couplings are as follows, they are increase in load capacity, increase in allowable shaft angle and reduction in vibration and noise. So far, many studies have been conducted on relations of shapes of tooth surfaces, axis displacements, number of tooth pairs in contact, etc. However, there is no research that has analyzed tooth contact of gear couplings using the shape of tooth surface actually finished by various kinds of tools.In this paper, a method for calculating the tooth clearance of the gear coupling using the shape of tooth surface interpolated from many section profiles by means of parabolic approximation is proposed. The method was applied the gear couplings the gears of which are manufactured in the different ways and have different profiles. As the results, a new tooth profile that brings good tooth contact for gear couplings was developed.

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Structural health monitoring has been used to confirm the durability evaluation and safety of a structure in which long-term use is required. Because the transmission loss of the optical fiber sensor is extremely small, it can measure the present status of structures from far away. Generally the FBG (Fiber Bragg Grating) optical sensing systems are often used to get reliable indices from structures. The shipping industry recently, there has been a growing interest in fuel efficiency improvements and energy regulation in international shipping. Therefore, during sailing, to measure the exact power of the main shaft of the ship has become important. We proposed the monitoring system using space optical transmitting of the FBG optical fiber to get information from a rotational shaft. And we evaluated the performance of the space optical transmission of the FBG optical fiber sensing system for rotational shaft in the previous study. Consequently, we reported that it can be effectively measured and space optical transmission metric is effective for performance prediction．In this paper, the strain and the temperature on the rotating torsion shaft, is measured by the FBG optical fiber sensor and the space optical transmission. We confirm reliability of the information that is retrieved from the rotating shaft subjected to torsion in the experiment. The conditions for reliable data from the rotating shaft under loading is obtained on the basis of the experimental results of the proposed systems.

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