Measurement of reflection factor at oblique incidence with pressure-velocity transducers

作者：Lin, Wang-Lin; Bi, Chuan-Xing; Zhang, Yong-Bin^*

来源：Noise Control Engineering Journal, 2016, 64(3): 379-387.

DOI：10.3397/1/376387

• FIELD ACOUSTIC HOLOGRAPHY
• FOURIER-TRANSFORM METHOD
• SOUND FIELD
• SEPARATION
• COEFFICIENTS
• IMPEDANCE
• ARRAY
• PROBES

Tamura proposed the well-known spatial Fourier transform method for measuring the reflection factor at oblique incidence, which is based on measurements of pressure on two planes (PP-method). In the present paper, that spatial Fourier transform method is modified by allowing the input data to be measurements of pressure and particle velocity on one plane (PV-method) or particle velocity on two planes (VV-method). Numerical simulations and experiments are carried out to examine the feasibility of the PV- and VV-methods and to show their performances in comparison with the PP-method. It is shown that the PV-method provides almost the same results as the PP-method under all conditions. Meanwhile, the VV-method provides good results at angles of incidence less than a certain value (around 60 degrees if the radial measurement line is about 100 cm long) when a dipole source is used, but leads to significant deviations at larger angles of incidence except for (nearly) rigid material. Also, the VV-method performs better than the other two methods when the flow resistivity of the absorbing material is large or when the frequency is high.

• 出版日期2016-5
• 单位合肥工业大学