直方体吸音音場の解析手法に関する研究

抄録

In the design of the cabin such as a car and an agricultural machine, the construction machine, it is necessary to consider about the acoustic feature in the cabin, and to design it. However, we hear that it is possible only to the frequency range of approximately 0-300Hz by the analysis using FEM. On the other hand, the frequency range of 300-1000Hz, called ‘middle frequency range' is regarded as important about the design of the cabin, but the analytical method of this range is non-establishment. Therefore, in this study, we suggest modeling of cuboid space having sound absorption material and the analytical technique of the acoustic feature in consideration of the acoustic absorption effect with a wall and the seat. We suggested ‘impedance wall model’, ‘two medium model’ and ‘uniform absorptive sound field model’. Two medium model that were close analytical method, and the calculated value accorded with experimental value and was able to confirm the validity of the model. In addition, uniform absorptive sound field model that was approximate analytical method and accorded with an experiment with the calculated value in 1/3Octave band.