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A direct method for acoustic impedance measurement based on the measurement of electrical impedance of acoustic transmitter |
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| Institution: | 1. School of Automation, Northwestern Polytechnical University, Xi’an 710071, People’s Republic of China;2. NDT&E Research Centre, Beijing University of Technology, Beijing, 100124, People’s Republic of China;3. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;1. Laboratoire de Mécanique Appliquée Université des Sciences et de la Technologie d’Oran Mohamed Boudiaf, BP 1505 El-M’naouar, Oran, Algeria;2. Ecole Nationale Polytechnique d’Oran Maurice Audin, BP 1523 El-M’naouar, Oran, Algeria;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, PR China;2. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou 310027, PR China |
| Abstract: | A simple and straight forward method for acoustic impedance measurement is presented and evaluated. In this method a speaker is used as the signal source. The relationship between the electrical impedance of the speaker and its acoustical load is developed and studied. It is shown that the electrical current and voltage of the speaker relate to the acoustical pressure and volume velocity. The mechanical and acoustical impedances are therefore easily derived by measuring the electrical current and voltage of the circuit. The proposed method yield itself to the automatic computer measurement and can be used for the field and in situ measurements.Comparison of the measurement data with those from other methods proves the applicability and accuracy of the proposed method. |
| Keywords: | Acoustic impedance Mechanical impedance Measurement |
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