A study of a hydrogen use fuel cell system is promoted from the viewpoint of environmental measures and energy problem. As for the fuel cell-powered vehicle in particular, marketing is expected in the near future. However, constructing of infrastructure for a leak gas detection system is necessary for the safe use of hydrogen for the spread of fuel cell systems. We use simulation in this article and grope for acoustic technology use gas detection method for large-scale space and danger of accumulation/explosion assumes in particular a basement parking area in the case of gas-leak. In this paper, we mainly consider on a sound condition change when a car was posted in space.
