“…Machines prevalently used in living environments do not frequently generate low-frequency noises at sound pressure levels higher than 70 dB(SPL) [1,6,7]. However, noises generated by large transportation machines such as aircraft, ships, and large trucks often contain low-frequency components at sufficiently high sound pressure levels to induce vibratory sensations [1,8,9]. Additionally, in working environments, many machines can be a source of high-level low-frequency noise that can induce vibratory sensation [1,10,11].…”