Reduction of sonic booms is one of the most important environmental challenges in overland supersonic flights. Since sonic booms differ from other transportation noise in the sense that they are very strong shock waves with large acoustic energy at very low frequencies, special evaluation metrics and acceptability standards are necessary. Also, for practical evaluation of sonic booms in everyday life, sonic booms under both indoor and outdoor conditions need to be investigated. With this in mind, a new sonic boom simulator is under development by Japan Aerospace Exploration Agency (JAXA). After investigating synthesis methods of sonic booms by using a simple sonic boom simulator with headphones in the first phase, a new device for simulating and investigating indoor sonic booms has been developed in the second phase and is reported in this study. In this device, synthetic sonic booms are played back through loudspeakers, and the sonic boom signatures before and after transmitting architectural materials, as well as vibrations of the materials, are measured. The device developed in this study will be integrated in a new sonic boom simulator, which is currently under development in the final phase, to simulate sonic booms in indoor spaces. This simulator will be used for psychoacoustic experiments with test subjects to investigate the effects and acceptability of sonic booms both indoors and outdoors.
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