ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF REMOTE MICROPHONE SYSTEM RESPONSE FOR PREDICTION OF SURFACE PRESSURE FLUCTUATIONS

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AFSHARI ABBAS; DEHGHAN ALI AKBAR; kalantar vali; farmani Mohammad

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Journal: Modares Mechanical Engineering Year:2017 | Volume:16 | Issue:10 Page(s): 155-162

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Title

ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF REMOTE MICROPHONE SYSTEM RESPONSE FOR PREDICTION OF SURFACE PRESSURE FLUCTUATIONS

Author(s)

AFSHARI ABBAS | DEHGHAN ALI AKBAR | kalantar vali | farmani Mohammad | Issue Writer Certificate

Keywords

REMOTE MICROPHONE SYSTEMQ1

ANALYTICAL SOLUTION OF SOUND PROPAGATIONQ1

DYNAMIC RESPONSEQ2

UNSTEADY PRESSURE FLUCTUATIONSQ1

EXPERIMENTAL CALIBRATIONQ1

Abstract

Accurate measurement of UNSTEADY PRESSURE FLUCTUATIONS along a surface requires experimental set up with high spacing resolution and high frequency domain. Therefore, in recent decades extensive studies have been conducted on remote microphone approach. In this method, instead of using flash mounted sensors, they were installed remotely and connected to the model surface through one or several continuously connected tubes. Surface pressure fluctuations travel within the tubing in the form of sound waves and they are measured when passing over the remote pressure sensor, mounted perpendicular to the tubing. In the present study, an analytical solution of sound waves propagation inside the rigid tubes is used for modelling of the REMOTE MICROPHONE SYSTEM and to investigate the effects of its parameters on DYNAMIC RESPONSE. In order to verify the accuracy of proposed modeling, the DYNAMIC RESPONSE of a typical remote microphone has been obtained through EXPERIMENTAL CALIBRATION.Comparing the analytical and experimental results indicates high accuracy of the analytical modeling.Results show that changes in tubing diameter lead to occurrence of resonance and creating harmonics in two frequency regions. The amplitude of low-frequency harmonics depends on the length of the damping duct and decreases with increasing of its length. Instead, the amplitude and frequency of highfrequency harmonics depend on the length of the first tube and they decrease with the increase of first tube length. Also, increase of the first and second tube lengths leads to an increase in phase of DYNAMIC RESPONSE of the REMOTE MICROPHONE SYSTEM.

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APA: Copy

AFSHARI, ABBAS, DEHGHAN, ALI AKBAR, kalantar, vali, & farmani, Mohammad. (2017). ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF REMOTE MICROPHONE SYSTEM RESPONSE FOR PREDICTION OF SURFACE PRESSURE FLUCTUATIONS. MODARES MECHANICAL ENGINEERING, 16(10 ), 155-162. SID. https://sid.ir/paper/178245/en

Vancouver: Copy

AFSHARI ABBAS, DEHGHAN ALI AKBAR, kalantar vali, farmani Mohammad. ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF REMOTE MICROPHONE SYSTEM RESPONSE FOR PREDICTION OF SURFACE PRESSURE FLUCTUATIONS. MODARES MECHANICAL ENGINEERING[Internet]. 2017;16(10 ):155-162. Available from: https://sid.ir/paper/178245/en

IEEE: Copy

ABBAS AFSHARI, ALI AKBAR DEHGHAN, vali kalantar, and Mohammad farmani, “ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF REMOTE MICROPHONE SYSTEM RESPONSE FOR PREDICTION OF SURFACE PRESSURE FLUCTUATIONS,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 10 , pp. 155–162, 2017, [Online]. Available: https://sid.ir/paper/178245/en

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