Abstract
The purpose of this study is to establish a method for efficiently reducing interior rain noise. We measured excitation forces caused by rainfalls and found that the frequency characteristics of the forces do not have prominent peaks. Thus, it is concluded that rain noise performance is determined by noise transfer functions between ear position and various points on the roof panel. We proposed a simulation method of rain noise and investigated efficient countermeasures by the simulation. The effectiveness of the countermeasures was verified by comparison with actual measurements.
