Showing papers in "Applied Acoustics in 2002"

TL;DR: In this paper, the authors assessed how listener's judgments of a set of urban sound environments were affected by cooccurring visual settings and found that the more urban the visual setting, the more negative the sound ratings.

TL;DR: A review of the analytical, experimental and numerical methods used for the investigation of brake squeal is given in this paper, where the characteristics and current difficulties encountered in tackling Brake Squeal are first described.

TL;DR: In this article, the results obtained in a study on environmental noise pollution in the city of Curitiba, Brazil were presented and tabulated for 1000 locations spread over the urban zones of the city.

TL;DR: An urban noise survey was conducted in the city of Caceres (Extremadura, Spain) as mentioned in this paper, where the streets were classified according to their use in communicating the different zones of the city.

TL;DR: In this article, the authors performed traffic noise surveying and analysis along three main roads in the Beijing urban area, the 2nd and 3rd ring roads circling the central downtown area and Chang-An Avenue, a major east-west corridor road through the heart of the city.

TL;DR: In this paper, a road traffic noise prediction model was developed suitable for use in China, which is based on local environmental standards, vehicle types and traffic conditions, and the model was accurate to 0.8 dBA at locations near the road carriage way and 2.1 dBA within the housing estate.

TL;DR: In this article, Fuchs et al. proposed a method for measuring the absorption efficiency at frequencies far below 100 Hz using a special measuring procedure based on the reverberation of a small rectangular room at its eigenfrequencies.

TL;DR: Noise exposure doses of more than 200 workers from 90 Cypriot industries, ranging from timber to food and beverage, showed that 27.8% suffered some hearing damage while 7.7% suffered serious hearing loss.

TL;DR: In this paper, the effects of transverse shear and rotary inertia on large amplitude vibration for a laminated plate in a general state of nonuniform initial stress are derived.

TL;DR: In this paper, the authors present a detailed procedure for designing and practically realising cheap and easily tuneable controllers providing good noise attenuation and satisfying several constraints related to frequency band, stability margin, etc.

TL;DR: In this paper, a torque actuator and a distributed piezoelectric polymer (PVDF) actuator are utilized for control of a rotating cantilever flexible beam.

TL;DR: In this article, the behavior of the structural-acoustic coupling between the flexible plate and the air cavity is analyzed by using the proposed finite element modal method, and the system finite element equation is reduced and expressed in terms of the modal coordinates with small degrees of freedom.

TL;DR: In this article, a finite element model is made for individual blocks in order to investigate their first eigenfrequencies and mode shapes, which is used to build an equivalent model consisting of a simple mass and springs.

TL;DR: In this article, a pseudo-forces approach was used to reconstruct the response field of a small air-compressor. But the reconstruction was limited to within 3 dB and the confidence intervals were only 2-3 dB wide.

TL;DR: In this article, the authors measured the acoustic and seismic signals of military vehicles passing between two newly-developed sensor stations separated by about 100 m distance, and used learning-vector quantisation to recognize vehicle type.

TL;DR: In this article, Binaural sound recordings in various positions in a high-speed train have been used as stimuli in listening tests, and loudness revealed to be the most important parameter; it could be very well described by A-weighted levels.

TL;DR: The implementation of the proposed adaptive algorithm based on waveform synthesis on a multiple channel adaptive control system, which is used to control the noise radiated by a small transformer in an anechoic chamber, shows that the proposed algorithm requires less memory and less computation load than a typical Implementation of the FXLMS algorithm.

TL;DR: This paper proposes a cumulant based algorithm to characterize the wide band and fully correlated signals and removes the additive Gaussian noise and then improves the existing narrow band array processing techniques.

TL;DR: In this paper, a new derivation for a scattering matrix for reflection and transmission of higher order modes at the planar junction of two waveguides is presented and the derivation is extended to include finite junction wall impedance and offset waveguide.

TL;DR: In this article, the free vibrations of elastic in vacuo circular toroidal shells under different boundary conditions were studied using the linear Sanders thin shell theory, where beam functions were used to describe the motion along the meridional direction whilst trigonometric functions are used to represent the deformation of the cross section.

TL;DR: In this paper, a radiosity-based computer model has been developed and a parametric study has been carried out using the model to study the basic characteristics of conversation intelligibility in dining spaces.

TL;DR: In this article, the authors define an index to evaluate the indoor noise reduction index (NRI) with open window; it is a function of the acoustic absorption coefficient of the room ceiling.

TL;DR: In this paper, the effect of floor mobility on structure-borne sound power transmitted from a vibratory machine to the floor/roof and the interactions among several contact points between the vibrator and the floor was investigated.

TL;DR: Noise levels in Greater Cairo were higher than those set by the Egyptian noise standards and policy to protect public health and welfare in residential areas, and a social survey carried out simultaneously indicated that 73.8% of respondent residents were highly or moderately irritated by road traffic noise.

TL;DR: In this paper, the authors present the numerical implementation of a sound field model used in urban acoustics, which is based on a classic diffusion equation for the sound energy, a simple finite difference scheme is applied.

TL;DR: In this paper, the effects of the interior panel on the sound radiation, which show a negative effect at low frequencies due to the mass-air-mass resonance, are discussed in detail.

TL;DR: HAL as mentioned in this paper is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not, which may come from teaching and research institutions in France or abroad, or from public or private research centers.

TL;DR: In this article, a virtual laboratory (VL) is used for the numerical simulation of standardised measurements under predefined, controlled, acoustic conditions, and the geometry of the transmission rooms is designed following first principles, in order for diffuse field conditions and sufficiently smooth primary mode distribution in the low frequency to be achieved.

TL;DR: In this paper, a finite element for axisymmetric elasticity is formulated directly in cylindrical coordinates, and the element is used to study the vibration of hollow, isotropic finite length cylinders.

TL;DR: In this paper, a modified Mak and Yang predictive equations were proposed to predict flow-generated noise produced by various configurations of two in-duct elements and duct dimensions, and compared their predictive values with the experimental results of Oldham and Ukpoho.