Figure 5.

a) A photograph of a 15 kW air compressor used in a manufacturing process. b) A frequency response characteristic of the noise data generated from the operating air compressor measured by the S‐ABM. c) and d) The results of measuring the noise data during normal operation and when the slip occurs at channels 2, 8, and 15, respectively. e) A graph of the frequency response characteristics of the noise data of buses, trucks, and motorcycles. f) The results of measuring the noise data of vehicles at channels 2, 6, and 10 of the S‐ABM sensor.