شبیه سازی عددی اثر حفاظ فیزیکی بلیمپ روی اختلاف فاز سنسورهای آکوستیکی

In common models, the presence of receiver capsules helps to create a phase delay (analog and at a certain frequency) in the incoming waves from the microphone, so that the incoming waves from the side walls are out of phase and cancel each other out, and the impact of side sounds is reduced. But the purpose of this article is that the frequencies in which the operation is performed are entered by the operator and within the desired range. This cannot be done by creating receptor capsules. Microphones are placed instead of the receiver capsules to perform the operation digitally and the desired frequencies are specified through the operator.
In this article, the frequency and directional responses of the microphones inside the shield are investigated by standing wave and interference phenomena. By emitting the wave from the wave source placed in different coordinates, the phase difference between the microphones is observed and its results are compared with the reference relationship. Also, the effective parameters in creating the nonlinear phase difference are examined, then the frequency at which the phase difference becomes nonlinear is obtained. In addition to the phase difference, the analysis of the amplitude difference has also been investigated. The simulation performed in this article was done in a 3D model with a blimp. According to the received results, it can be seen that the amplitude difference is reliable only at lower frequencies due to the increase in wavelength due to the increase in frequency. Also, the phase difference has a large error due to the rapid change of the wave front in opposite phases and at high frequencies, which can be improved by shortening the distance between the two microphones.