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- W2027023736 abstract "Measurements of the specific acoustic impedance of ground covered by institutional grass were performed using both a cardioid beamforming method and the established transfer function method [J. Y. Chung and D. A. Blaser, 907–921 (1980)]. The cardioid method steers a beampattern to separate the incident and reflected waves. Both methods were applied to impedance tube and free-field measurements. With proper calibration, the cardioid and transfer function methods are mathematically identical and produce similar experimental results. Comparison of the impedance tube and free-field measurements suggest that the latter approach produces more reliable results. However, due to practical limitations of the source/receiver geometry free-field measurements at low frequencies are more complicated in that the plane wave assumption is not valid." @default.
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- W2027023736 date "1995-05-01" @default.
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- W2027023736 title "Application of cardioid beamforming in both impedance tube and free‐field measurements of ground impedance" @default.
- W2027023736 doi "https://doi.org/10.1121/1.411663" @default.
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