Abstract

Electric vertical takeoff and landing (eVTOL) aircraft require a significant amount of power to operate and fly efficiently over long distances. Nevertheless, long-distance flights of electric vehicles are limited by the energy density of batteries and the specific power of electronics. Mid-voltage power electronics can increase the voltage of the power supply and reduce the current, allowing the eVTOL aircraft to operate more efficiently. However, the breakdown voltage in aircraft is significantly lower than ground due to Paschen’s effect. As such, condition monitoring of power electronics has become critical to the safe operation of eVTOL. In recent years, acoustic emissions (AE) sensors have gained traction within the electronics space, due to their resistance to electromagnetic interference and high temperatures. In this study, acoustic emissions from an integrated circuit are experimentally measured and analyzed for condition monitoring. An AE sensor was applied onto a NE555PCR oscillator placed upon an epoxy substrate to characterize the electromagnetic waves emitted from the device under various input loads. Acoustic emissions were detected upon applying voltage to the oscillator, in which correlates with the output of the device, as well as its input state.

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