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A Novel Approach to Port Noise Characterization Using an Acoustic Camera
Science of the Total Environment, 2022Acoustic cameras are powerful instruments combining an optical camera with a microphone array to obtain information about power and location of noise sources. The main aim of this study is to identify key points in the application of an acoustic camera to the characterization of port noise.
Enrico Rizzuto +2 more
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Characterization and Prediction of Gradient Acoustic Noise in MR Imagers
Magnetic Resonance in Medicine, 1997AbstractGradient acoustic noise has been measured and characterized for an epoxy‐potted, shielded gradient assembly in a 1.5 T MRI system. Noise levels vary by 10 dB or more as a function of longitudinal position in the scanner and reflect the pattern of forces applied to the gradient assembly. The noise level increases slightly (1–3 dB) with a patient
William A. Edelstein
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Frequency-Band Analysis for Acoustic Noise Characterization of an Interior Permanent Magnet Motor
IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society, 2021The analysis of acoustic noise characteristics is important for effective noise reduction. This paper presents a computationally efficient approach for acoustic noise analysis of an interior permanent magnet (IPM) motor. A combination of surface velocity results calculated using ANSYS are coupled with AVL EXCITE Acoustics to estimate the air-borne ...
Berker Bilgin
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Acoustic characterization and noise reduction strategies for a general aviation aircraft
The Journal of the Acoustical Society of America, 2008 This work concerns with the vibro-acoustic characterization of a general aviation aircraft with the objective of designing solutions to reduce the inside noise level during the flight; first of all a new passive insulation, and then verifying the possibility of an active noise control approach.
Rusciano N., VISCARDI, MASSIMO
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Mechanical-Thermal Noise Characterization of a New Micromachined Acoustic Sensor
SPIE Proceedings, 2007A new integrated CMOS micromachined inductive microphone is studied and characterized for mechanical-thermal noise. This acoustic sensor has one suspended membrane attached to the substrate with 4 arms, the I-beam or L-beam shaped attachments. This membrane has 1.4x1.4mm 2 active area, 22mg mass and its natural frequency is found to be around 250 ...
Mohamed Masmoudi, Fares Tounsi
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Characterization of unmanned aircraft system acoustic noise
INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 2023UAS (unmanned aircraft systems) are used in a variety of commercial and military enterprises. In military settings, being able to identify location as well as number of enemy UAS can lead to stronger strategic positioning or appropriate countermeasures. In community settings, UAS can be a source of annoyance.
Reese Rasband +2 more
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Acoustic characterization of in-room footfall noise
The Journal of the Acoustical Society of America, 2007Existing literature concerning footfalls is primarily focused on its transmission between spaces, such as a floor/ceiling’s Impact Isolation Class. This study measured in-room sound power spectra produced by footfalls on eleven different floor surfaces using human subjects and a standard tapping machine. Within a reverberation room, 7 male and 7 female
Samantha B. Rawlings +2 more
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Acoustic characterization of in-room footfall noise
Journal of the Acoustical Society of America, 2016Existing literature concerning footfalls is primarily focused on its transmission between spaces, such as a floor/ceiling's Impact Isolation Class. Studies at the University of Hartford measured in-room sound power spectra produced by footfalls on twelve different floor surfaces using human subjects and a standard tapping machine.
Samantha B. Rawlings +4 more
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Characterization of vibration and acoustic noise in a gradient-coil insert
Magnetic Resonance Materials in Physics, 2004High-speed switching of current in gradient coils within high magnetic field strength magnetic resonance imaging (MRI) scanners results in high acoustic sound pressure levels (SPL) in and around these machines. To characterize the vibration properties as well as the acoustic noise properties of the gradient coil, a finite-element (FE) model was ...
G Z, Yao, C K, Mechefske, B K, Rutt
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