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Journal Articles
Accepted Manuscript
Journal:
Journal of Vibration and Acoustics
Publisher: ASME
Article Type: Technical Briefs
J. Vib. Acoust.
Paper No: VIB-24-1246
Published Online: February 6, 2025
Journal Articles
Journal:
Journal of Vibration and Acoustics
Publisher: ASME
Article Type: Research Papers
J. Vib. Acoust. April 2025, 147(2): 021006.
Paper No: VIB-24-1167
Published Online: February 5, 2025
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 1 Noise sources, and their relative level and direction in a typical turbofan engine, reproduced from Ref. [ 4 ] More about this image found in Noise sources, and their relative level and direction in a typical turbofan...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 2 Ducted fan with a single stator vane deposited with thermo-acoustic transducer More about this image found in Ducted fan with a single stator vane deposited with thermo-acoustic transdu...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 3 Schematic of the experimental setup More about this image found in Schematic of the experimental setup
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 4 Schematic depiction of microphone positions around the fan testbed during directivity measurements More about this image found in Schematic depiction of microphone positions around the fan testbed during d...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 5 Structure of the stator vane deposited with thermo-acoustic transducer and its cross-sectional view More about this image found in Structure of the stator vane deposited with thermo-acoustic transducer and ...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
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...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 7 Allan variance distribution of phase error variance (rad 2 ) with respect to number of cycles utilized More about this image found in Allan variance distribution of phase error variance (rad 2 ) with respect t...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
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...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 9 Phase convergence of first BPF harmonic at a speed of 7000 rpm More about this image found in Phase convergence of first BPF harmonic at a speed of 7000 rpm
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 10 Sound pressure level of the thermophone located on the stator vane at varying discrete frequency and power levels More about this image found in Sound pressure level of the thermophone located on the stator vane at varyi...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 11 Thermophone directivity at 2800 Hz More about this image found in Thermophone directivity at 2800 Hz
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
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...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
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...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
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...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 15 Comparison between unexcited and excited spectra at fan speed of 7000 rpm More about this image found in Comparison between unexcited and excited spectra at fan speed of 7000 rpm
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
Published Online: February 5, 2025
Fig. 16 Radially aligned beamforming configuration, where the microphones are placed in the frontal plane 0.05 m away from the rotor blades More about this image found in Radially aligned beamforming configuration, where the microphones are place...
Image
in Application of Embedded Thermophones Toward Tonal Noise Cancelation in Small-Scale Ducted Fan
> Journal of Vibration and Acoustics
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
Accepted Manuscript
Journal:
Journal of Vibration and Acoustics
Publisher: ASME
Article Type: Research Papers
J. Vib. Acoust.
Paper No: VIB-24-1275
Published Online: January 31, 2025
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