Null constrained adaptive beamformer—Discrete white noise source analysis

ABSTRACT This paper investigates the plastic displacements occurring when certain types of elastoplastic multistory shear structures are subjected to large earthquakes. It is directed toward finding a variation of the horizontal stiffness and strength up the structure in order to minimize yield displacements and distribute them over the structure. The analysis has been made on an analog computer using a white noise source to simulate the earthquake disturbance.

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Installed jet noise source analysis by microphone array processing

25th AIAA/CEAS Aeroacoustics Conference ◽

10.2514/6.2019-2654 ◽

2019 ◽

Cited By ~ 1

Author(s):

Renaud Davy ◽

Frédéric Mortain ◽

Maxime Huet ◽

Thomas Le Garrec

Keyword(s):

Noise Source ◽

Array Processing ◽

Microphone Array ◽

Jet Noise ◽

Source Analysis

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Noise Source Analysis and Control for Two Axial-Flow Cooling Fans in Series

Fluid-Structure-Sound Interactions and Control - Lecture Notes in Mechanical Engineering ◽

10.1007/978-3-662-48868-3_9 ◽

2015 ◽

pp. 57-62 ◽

Cited By ~ 1

Author(s):

C. Wang ◽

W. Zhang ◽

L. Huang

Keyword(s):

Noise Source ◽

Axial Flow ◽

Source Analysis ◽

Cooling Fans ◽

In Series ◽

And Control

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Changes in masked thresholds of a harbour seal (Phoca vitulina) associated with angular separation of signal and noise sources

Canadian Journal of Zoology ◽

10.1139/z94-253 ◽

1994 ◽

Vol 72 (11) ◽

pp. 1863-1866 ◽

Cited By ~ 14

Author(s):

S. D. Turnbull

Keyword(s):

White Noise ◽

Pure Tone ◽

Noise Source ◽

Angular Separation ◽

Phoca Vitulina ◽

Harbour Seal ◽

Noise Sources ◽

Detection Thresholds ◽

Noise Masker ◽

Significant Difference

The masked pure tone thresholds of a harbour seal (Phoca vitulina) were measured at various angles using a white noise masker. The white noise source was placed at 0°, 30°, 60°, and 90° relative to the midline of the seal's head (0°). The masked pure tone thresholds for each angle were determined at 2, 4, 8, and 16 kHz. As the angle separating the signal and noise sources increased from 0° to 90°, the critical ratios of the harbour seal decreased by 1–4 dB. This shift in masked thresholds from a reference point of 0° azimuth was significant (H = 10.374, df = 3,16, p < 0.05). No significant difference was found in masked thresholds between 0° and 30° or between 60° and 90°. This indicates that if a noise source is separated by more than 30° relative to the location of a vocalizing seal, signal detection thresholds will be enhanced and communication distances increased.

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