How to measure indoor reverberation time in large vehicles

摘要

When measuring the indoor reverberation time of a large vehicle with a large indoor space such as a bus, the indoor reverberation time is measured in a large vehicle so that the indoor reverberation time of a large vehicle can be accurately measured by allowing two rooms to sufficiently excite the room. The method of the present invention relates to a method in which a vehicle interior excitation for measuring reverberation time in a large vehicle having a large indoor space is provided as two speakers, and the two speakers are installed to maintain a predetermined distance at the lower left and right centers of the vehicle interior. Position the plurality of microphones to measure the excitation sound pressure at the front and rear in a direction of 1/2 each on both sides of the left and right centers of the vehicle interior where the two speakers are installed, and the installation of the two speakers and the microphone The speakers and microphones are positioned at the left and right of the vehicle at equal intervals. The positions of the microphones are maintained at equal intervals, and the positions of the microphones are equilibrated at the center portion of the vehicle interior height so that the indoors can be sufficiently excited when measuring the indoor reverberation time of a large vehicle having a large indoor space such as a bus. Not only can the reverberation time of the vehicle be accurately measured, but also the accurate reverberation time measurement can provide reliability in the comparison and evaluation of the sound absorption performance of the sound absorbing material or molded article applied to the vehicle interior.