Abstract
The article presents the results of noise measurements during a control passage recorded in the interior of a bus with a serial hybrid drive. The noise was recorded in a continuous mode, and the course was adjusted for the pressure level and spectrogram in the field of time and frequency.
Highlights
The tests were conducted for a city bus with a serial hybrid system in the following configuration: CNG engine-electric generator-energy recuperation system-central electric drive motor
An additional negative sound effect is the noise associated with the operation of the electric drive motor on the wheels of the drive axle, generating unpleasant sounds received as a “squeak”
The sound pressure level itself is within the standard, the character of the hybrid vehicle in which fixed speed values have been assumed (850, 1200, 1600 revolutions/min) of the CNG engine operation, causes troublesome an impression of monotonous noise
Summary
The tests were conducted for a city bus with a serial hybrid system in the following configuration: CNG engine-electric generator-energy recuperation system-central electric drive motor. The research was aimed at addressing the feelings of passengers. The noise related to the operation of a CNG-powered engine causes a burdensome impression of monotone noise which, when prolonged exposure, is annoying, impairing the comfort of traveling. An additional negative sound effect is the noise associated with the operation of the electric drive motor on the wheels of the drive axle, generating unpleasant sounds received as a “squeak”. The scope of the tests included continuous recording of noise inside the vehicle during the check-up allowing detailed analyses including frequency analysis of the structure of registered noise
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