An uncertainty reduction technique for predicting the uncertain acoustic field with interval environmental parameters

Uncertain speed of sound will lead that the interval perturbation method fails to precisely predict the uncertain acoustic field in some frequency bands. An uncertainty reduction technique is proposed for this problem. This technique first determines the bands in which the interval method is being invalid through the modal frequency analysis. Then, the dimensionality of the uncertain parameters is reduced by converting the uncertain speed of sound into a certain one. This technique can be used in the interval or subinterval perturbation methods. The numerical example demonstrates that the proposed technique is effective for uncertain acoustic field simulation with interval parameters.