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Main steps of the data processing process—(1) identification of subsets; (2...
Published Online: February 5, 2025
Fig. 6 Main steps of the data processing process—(1) identification of subsets; (2) division into individual subsets for each fan revolution; (3) interpolation; (4) ensemble averaging; (5) stacking; and (6) conversion to frequency domain More about this image found in Main steps of the data processing process—(1) identification of subsets; (2...
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For the unexcited reference condition, spectral distribution of pressure am...
Published Online: February 5, 2025
Fig. 8 For the unexcited reference condition, spectral distribution of pressure amplitude as observed by microphone placed 420 mm upstream of the rotor along the central axis (Mic 1) at fan speeds of 6250 rpm, 6500 rpm, and 7000 rpm More about this image found in For the unexcited reference condition, spectral distribution of pressure am...
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( a ) SPLs for excited and unexcited cases for first harmonic of BPF at 279...
Published Online: February 5, 2025
Fig. 12 ( a ) SPLs for excited and unexcited cases for first harmonic of BPF at 2793 Hz at different angular positions in between 0 and 4 π with an interval of π /6; ( b ) calculated phase of the source for only the unexcited condition at the same frequency for respective microphone positions More about this image found in ( a ) SPLs for excited and unexcited cases for first harmonic of BPF at 279...
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Sound pressure levels recorded by the two microphones for differing relativ...
Published Online: February 5, 2025
Fig. 13 Sound pressure levels recorded by the two microphones for differing relative phases of thermophone actuation with respect to first harmonic of rotor blade passing at fan speeds of 6250 rpm (top), 6500 rpm (middle), and 7000 rpm (bottom) and corresponding frequencies of 2484 Hz, 2595 Hz, an... More about this image found in Sound pressure levels recorded by the two microphones for differing relativ...
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For thermophone excitation at the relative phase angle conducive to noise c...
Published Online: February 5, 2025
Fig. 14 For thermophone excitation at the relative phase angle conducive to noise cancelation at the first harmonic of blade pass frequency, spectral distribution of pressure amplitude as observed by Mic 1, placed 420 mm upstream of the rotor along the central axis at fan speeds of 6250 rpm, 6500 ... More about this image found in For thermophone excitation at the relative phase angle conducive to noise c...
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Exemplary beamforming results at 2800 Hz with measurements taken in the rad...
Published Online: February 5, 2025
Fig. 17 Exemplary beamforming results at 2800 Hz with measurements taken in the radial direction: (left) cross-sectional view of the rotor plane, rotor, and stator are depicted by the dashed and thick lines, respectively, circles indicate the locations of microphones, and the thicker dot denotes t... More about this image found in Exemplary beamforming results at 2800 Hz with measurements taken in the rad...
Journal Articles