Satellite components falling to the ground are a crucial problem, particularly titanium tanks in propulsion systems. Satellite tanks are generally made of titanium alloy because it is light and compatible with propellants used for the satellite. However, it also has a high melting point, which hinders melting on re-entry. To replace the titanium tanks, JAXA has studied as the tank for ground damage prevention on re-entry since 2010 and has started developing a new composite propellant tank since 2013. The tank is targeted; not only due to its demise properties but also its extended propellant storage, cost-effectiveness and a short delivery time. For the first development step, the minimum tank (DM: Development Model #1) which has the shortest cylindrical segment length and a volume of 250L were manufactured to confirm the strength proof of critical portions and the adequacy of production techniques. There are also plans to manufacture a PMD (Propellant Management Device) separately to the tank shell. This paper describes the design, trial productions, and data acquisition tests used when developing the new tank.
A wearable force display system using laminated passive elements is proposed in this paper. The laminated passive elements for wearable systems have already developed [4]. However, the performance of the elements is not clear when these are utilized as elements of a force display. In this paper, the force display ability in the case that a human operator touches an object in virtual world is investigated at first. At second, to wear the force display system a method without using an exoskeleton structure is proposed basing on measurement data of the stiffness on human skins. Finally, a partial wearable system in which only sensors and passive elements are wearable and a perfect wearable system are developed based on the proposed methods. From the experimental results, it is confirmed that the total weights and volumes of the developed force displays are enough small and the developed wearable systems can be effectively utilized for a force display if the human motion is considerably slow.
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