Showing papers in "Applied Acoustics in 2006"

TL;DR: A set of algorithms for real-time detection and localization of vocalizing marine mammals has been developed as part of the Marine Mammal Monitoring on Navy Ranges (M3R) program and results from the data set are provided.

TL;DR: In this paper, a double-leaf MPP (DLMPP) structure with an air-cavity between them and no rigid backing is studied numerically, and the effects of various control parameters are discussed through a numerical parametric study.

TL;DR: The proposed algorithm, based on the Teager–Kaiser (TK) energy operator, is able to detect efficiently creaks as well as regular clicks and is more effective in detection rate and much more accurate and robust.

TL;DR: In this article, an accurate and efficient coupled FDTD-PE model was applied, exploiting symmetry of the source and receiver canyon, for the case of two-dimensional sound propagation from a city canyon to a nearby, identical (receiver) city canyon.

TL;DR: In this paper, a methodology which combines finite element analysis and Zoutendijk's feasible directions method for muffler shape design is described, where the main goal is to obtain the dimensions of the acoustic muffler with the transmission loss (TL), being maximized in the frequency range of interest.

TL;DR: In this paper, the authors conducted a social survey aiming to identify the main sound sources, evaluate the annoyance and analyse the main effects of noise on people in the city of Valladolid, Spain.

TL;DR: A neighbourhood soundscape adjusted exposure indicator, NALden, is derived and designed to be used as input to traditional exposure–effect relationships to improve annoyance impact estimates.

TL;DR: In this article, the effect of the particle size on the acoustic performance of consolidated expanded clays is investigated experimentally and theoretically, and the results pave the way for the development of a simple practical model which will be able to link the acoustic properties of a consolidated granular mix with the characteristic particle dimension and the porosity data.

TL;DR: In this paper, a real-time underwater acoustic method was proposed to track whales using five omni-directional widely-spaced bottom-mounted hydrophones. But the tracking was performed in the time domain.

TL;DR: In this paper, the authors explored the potential for using this characteristic to improve force determination by an "optimal" spatial distribution of response locations, which is based on the minimization of the average condition number across the frequency range.

TL;DR: A reference archive has been constructed to facilitate research on automatic recognition of marine mammal sounds, and lets researchers use different sound-recognition methods on a common set of sounds, making it possible to compare directly the effectiveness of the different methods.

TL;DR: In this paper, the authors evaluated the acoustic properties of three types of autoclaved aerated concrete (AAC): gas cement, gas cement concrete with combined binder (Portland cement and lime), and foam cement concrete.

TL;DR: In this article, practical methods to define scattering coefficients, which is based on an approach of modeling surface scattering and scattering caused by limited size of surface as well as edge diffraction are presented.

TL;DR: In this paper, a single sperm whale was tracked using a model-based method that relies on the difference in arrival times along direct and surface-reflected propagation paths along the ocean surface.

TL;DR: In this paper, the extent to which response errors are amplified in the force estimates is considered and plotted against the matrix condition number, which is related not only to the condition number but also to the matrix dimensions including the extent of over-determination.

TL;DR: In this paper, a comparison between such a coupling and measurements obtained in a large-scale thermo-acoustic resonator constructed at the University of Manchester is made, and it is shown that a good agreement is obtained for small amplitudes and this progressively worsens as the amplitude is increased.

TL;DR: In this article, the structural intensity (SI) approach is adopted to identify the predominant vibration panels and interior noise sources for box structures, which can be an analogy of cabins of vehicle and aircraft.

TL;DR: In this article, two approaches to the optimal design of FIR beamformers with frequency invariant patterns using second-order cone programming (SOCP) are proposed, which can be solved efficiently using the well-developed interior-point methods.

TL;DR: In this article, an alternative strategy is investigated which allows the design of MPP with panels of millimetric thickness while maintaining their acoustic performance, named microperforated insertion units (MIUs), avoid the structural problems of the classical MPP.

TL;DR: In this article, the authors measured traffic noise attenuation at different 1/3-octave frequencies at three vegetation sites and a control site in Delhi, the capital city of India.

TL;DR: In this article, the characteristics of the vibrational power flow propagation in an infinite periodic ring-stiffened cylindrical shell immersed in water are studied by using space-harmonic analysis method.

TL;DR: This paper focuses on signal types that have a well-defined single frequency maxima and offers a method based on Sine wave modeling and Bayesian inference that will automatically detect and extract such possible vocalizations belonging to marine mammals while minimizing human interference.

TL;DR: In this article, a methodology is presented for the analysis of the structure-borne noise transmission paths for an automotive suspension assembly, with the objective of indicating which suspension transfer paths contribute the most to the structural forces transmitted to the chassis.

TL;DR: In this article, a study of the sound exposure experienced by a group of 32 people during one week in the Madrid Autonomous Region in Spain was carried out to determine the average sound exposure perceived by an inhabitant of the Madrid region; to this end the sample was designed to comprise a cross-section of the population.

TL;DR: In this paper, numerical simulation has been used to predict the interior noise inside a tracked vehicle, where the structural frequency dynamic response was determined using the software MSC/NASTRAN.

TL;DR: This paper shows that only the first six modes are sufficient for the sperm whale regular click decomposition, even when the signal-to-noise ratio is low, and that the time–frequency representation obtained using this method is appropriate for characterising and detecting sperm whale clicks.

TL;DR: In this paper, the effect of a speed bump on noise from a light vehicle is assessed by means of the concept of noise energy density, which is a function of the instantaneous distance between the vehicle and the bump, S(x).

TL;DR: In this paper, the authors revisited the popular Rayleigh integral approximation and also considered a second approximation, the high frequency boundary element method, which is similar to the rayleigh integral.

TL;DR: The 2003 workshop on detection of localization of marine mammals using passive acoustics, held in Dartmouth, NS, Canada is discussed and a common dataset is provided.