Investigation on Vibration and Sound Signals From Hybrid-Engine to Electric Vehicles

Abstract

Electric vehicles have been increasingly popular compared to conventional combustion engine vehicles. Along the way, hybrid electric vehicles have been developed to truly bridge the transition from internal combustion engines to electric vehicles. Therefore, an analysis of vibration and sound signals of a HEV and an EV is necessary to evaluate the quality of service comparatively. As for the HEV test with three measuring scenarios, the experimental data are collected and subsequently, the dominant frequency extraction is conducted. The hybrid-drive mode shows the highest level of vibration magnitude for all tested speeds; however, some scenarios of engine-drive mode are higher than hybrid-drive mode due to the engine and battery setups. Last but not least, the sound signal analysis is performed with the same scenarios. It has been seen that the levels of both sound and vibration magnitudes directly vary with the engine speed. As for the EV test, when the electric car starts to work by increasing the speed, its vibration and sound magnitudes measured at three distinct positions increase accordingly. This study is the basis for further development of the next generation EV in the vibration and sound passenger perception aspects.

Adjustment of Speed Governor for Marine Diesel Generator Engine

“…This increases the reliability of the power system. In accordance with the recommendations of the resolution Marine Environment Protection Committee (MEPC) 77 [23][24][25], it is necessary to increase funding for research on the optimization of existing ESAR of marine diesel engines to improve the energy efficiency of the merchant fleet.…”