Papers
TL;DR: A brief summary of selected recent aero-acoustics activity in the US can be found in this paper, where four topics of great interest to the aerospace industry are: Advanced Subsonic Technology (AST), High Speed Research (HSR), Rotorcraft noise control efforts, and Weapons bay and other noise control applications for the military.
Abstract: It is expected that with the projected increase in air travel aeroacoustics research will be very critical in meeting increasingly stringent aircraft noise certification standards. In the United States aeroacoustics research has steadily progressed toward enhanced safety, noise benefits and lower costs. This report provides a brief summary of selected recent aeroacoustics activity in the US. Four topics of great interest to the aerospace industry are: (1) Advanced Subsonic Technology (AST) for future subsonic aircraft, (2) High Speed Research (HSR) for future supersonic commercial aircraft, (3) Rotorcraft noise control efforts, and (4) Weapons bay and other noise control applications for the military. Examples of good progress in the areas of jet, fan, airframe and helicopter noise as well as liner design and weapons bay noise suppression are provided herein. In the next few years we look forward to seeing major strides in noise reduction technology and our ability to predict situations of aeroacoustics i...
6 citations
TL;DR: In this paper, it was found that low frequency noise sufferers tend to set thresholds of acceptability closer to their hearing threshold than other subject groups also, acceptability thresholds were set on average 5dB lower for fluctuating sounds.
Abstract: Results of laboratory tests are presented in which 18 subjects, including some low frequency noise sufferers, were presented with low frequency sounds with varying degrees of fluctuation Thresholds of acceptability were obtained for each sound and each subject, using the method of adjustment These thresholds were then normalised to individual low frequency hearing threshold It was found that sufferers tend to set thresholds of acceptability closer to their hearing threshold than other subject groups Also, acceptability thresholds were set on average 5dB lower for fluctuating sounds It is proposed that a sound should be considered fluctuating when the difference between L10 and L90 exceeds 5dB, and when the rate of change of the 'Fast' response sound pressure level exceeds 10dB/s
4 citations
TL;DR: In this paper, the authors present a volume 1, no. 2 of the volume 1 no. 1, volume 7, volume 2, volume 3, volume 4, volume 5.
Abstract: n o i s e n o t e s volume 1 no. 2
4 citations
TL;DR: In this paper, the development of thin panels that can be controlled electronically so as to provide surfaces with desired reflection coefficients is explored, such panels can be used as either perfect reflectors or absorbers They can also be designed to be transmission blockers that block the propagation of sound.
Abstract: This study explores the development of thin panels that can be controlled electronically so as to provide surfaces with desired reflection coefficients Such panels can be used as either perfect reflectors or absorbers They can also be designed to be transmission blockers that block the propagation of sound The development of the control system is based on the use of wave separation algorithms that separate incident sound from reflected sound In order to obtain a desired reflection coefficient, the reflected sound is controlled to appropriate levels The incident sound is used as an acoustic reference for feedforward control and has the important property of being isolated from the action of the control system speaker In order to use a panel as a transmission blocker, the acoustic pressure behind the panel is driven to zero Detailed experimental results are presented showing the efficacy of the algorithms in achieving real-time control of reflection or transmission The panels are able to effectively
3 citations
TL;DR: In this article, the authors present a review of studies of psychological responses to combined exposures of noise and whole-body vibration (WBV) for tracking tasks, arithmetic tasks, as well as subjective ratings.
Abstract: The aim of this review is to shed light on a research area that concerns the studies of psychological responses to combined exposures of noise and whole-body vibration (WBV) Vehicle drivers are a group of workers that are often exposed to multiple stressors like noise, WBV and mental loads Degraded performance because of environmental stressors may lead to injury or accidents Standards that govern health risk assessment do not take into consideration the complexities of these multiple exposure environments (ISO 1997a, ISO 1999) Some studies have shown that the effect of one factor may be different than the effect of two factors presented together For example, negative combined effects have been found in tracking tasks (Sommer and Harris, 1973), in arithmetic tasks (Harris and Schoenberger, 1980), as well as in subjective ratings (Ljungberg, Neely, Lundstrom, 2004), although in many of the studies the noise and WBV stimuli have been very unlike those that can be found in real workmg environments Appl
2 citations
Related Journals (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2009 | 2 |
| 2008 | 1 |
| 2007 | 2 |
| 2006 | 1 |
| 2005 | 2 |
| 2003 | 2 |