Sound power spectra modelling of the vehicle in motion equipped with rotary-screw propulsion unit. (February 2019) - Molev, Y
Abstract: Modelling sound power spectrum results of the vehicles in motion equipped with rotary-screw propulsion unit is considered in this article. Vibroacoustic properties of a vehicle while moving across countryside bad roads have been considered in the paper; expressions to determine sound power spectrum dependence on base cylinder mass and diameter, its rpm and screw blade winding angle have been obtained, as well as such force parameters of rotor-substructure interaction as friction force and screw blade penetration force. Experimental results of rotary-screw vehicle have been analyzed. The research results analysis shows that changing of propulsion unit construction parameters allows to reduce the environment noise impact level by 10 dB. The designed model and the results obtained are applicable when designing cross-country vehicles.