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Showing papers in "Applied Acoustics in 2017"


Journal ArticleDOI
TL;DR: In this paper, a vibration-based prognostic and health monitoring methodology for wind turbine high-speed shaft bearing (HSSB) is proposed using a spectral kurtosis (SK) data-driven approach.

169 citations


Journal ArticleDOI
TL;DR: In this article, an inverse method to predict the acoustical properties of nine natural fibers (kenaf, wood, hemp, coconut, straw, and granular cork) is presented.

162 citations


Journal ArticleDOI
TL;DR: In this paper, the authors applied acoustic emission (AE) technique and study the damage mechanism of reinforced concrete (RC) beams under four-point bending laboratory experiments are performed on three types of RC beams of grade M30 with 42, 64 and 93% of longitudinal steel against balanced section The damage in the beams are classified into four zones symbolizing formation of micro cracks, visible cracks, steel yielding and concrete crushing.

104 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigate the acoustic absorption capability of a multilayer micro-perforated panel absorber (MPPA) whose front layer is produced by additive manufacturing.

103 citations


Journal ArticleDOI
TL;DR: In this article, the effect of roadside vegetation on the reduction of road traffic noise under varying planting intensities was investigated. And the results showed that the traffic noise was reduced by 50% when vegetation was enhanced from a minimal to moderate planting intensity.

96 citations


Journal ArticleDOI
TL;DR: In this paper, the authors presented an early fault diagnostic technique of stator faults of the single-phase induction motor based on recognition of acoustic signals, which can be used for protection of rotating electrical machines.

95 citations


Journal ArticleDOI
TL;DR: This paper details the sensors’ design, development and potential future applications, with a focus on the calibration of the devices’ Microelectromechanical systems (MEMS) microphone in order to generate reliable decibel levels at the type/class 2 level.

94 citations


Journal ArticleDOI
TL;DR: In this article, the authors discussed the use of fibres from the oil palm empty fruit bunch (OPEFB) to be an alternative natural acoustic material for lower frequencies, this can be achieved by introducing air cavity gap behind the fibre samples.

91 citations


Journal ArticleDOI
TL;DR: An improved Empirical Mode Decomposition (EMD) method based on the multi-objective optimization is proposed and is applied to extract the fault feature of rolling bearing with inner and outer race fault and has better decomposition capability and can restrain the mode mixing apparently.

90 citations


Journal ArticleDOI
TL;DR: A combined ensemble empirical mode decompose (EEMD) and singular value decomposition (SVD) technique to extract useful fault features from the condition monitoring data of rolling element bearings is employed and it is found that the proposed algorithm can diagnose all bearing operation conditions accurately.

74 citations


Journal ArticleDOI
TL;DR: In this article, three signal processing techniques including an adaptive filter, spectral kurtosis and envelope analysis were applied to AE and vibration data acquired from a simplified planetary gearbox test rig with a seeded bearing defect.

Journal ArticleDOI
TL;DR: Results show that two statistical clusters differentiated by rush hour traffic flow are sufficient and better for categorization than the road types provided by Italian road regulation.

Journal ArticleDOI
TL;DR: In this article, an experimental study on sound absorption coefficients, including transmission, for some combined materials: waste materials (rubber particles, polypropylene, crumbled plastic, wood flour, jute and cord fabrics) with different backing plates (plasterboard, oriented strand board - OSB, polystyrene).

Journal ArticleDOI
TL;DR: In this paper, the ageing effect of glass/epoxy composite laminates exposed to seawater environment for different periods of time was investigated using acoustic emission (AE) monitoring.

Journal ArticleDOI
TL;DR: In this paper, the effect of introducing a flow of electric vehicles into real urban traffic has been studied and quantified, and experimental procedures were used to add to the NMPB ROUTES noise prediction model of the electric vehicle as a potential noise source in the traffic flow.

Journal ArticleDOI
TL;DR: Object-oriented design based on Python allows for easy-to-use scripting and graphical user interfaces, the practical combination with other data handling and scientific computing libraries, and the possibility to extend the software by implementing new processing methods with minimal effort.

Journal ArticleDOI
TL;DR: In this paper, an extended neck or a spiral neck takes the place of the traditional straight neck of the Helmholtz resonator, and the acoustic performance of the HR with these two types of necks is analyzed theoretically and numerically.

Journal ArticleDOI
TL;DR: In this article, the authors proposed a method to estimate the time delay of a water pipe using the cross-correlation of leak noise signals, which can be improved by using the frequency response function of the resonator(s) responsible for the resonance effects.

Journal ArticleDOI
Jiachi Yao1, Yang Xiang1, Sichong Qian1, Shuai Wang1, Shaowei Wu1 
TL;DR: In this article, the authors proposed a noise source identification method based on variational mode decomposition (VMD), robust independent component analysis (RobustICA), and continuous wavelet transform (CWT).

Journal ArticleDOI
TL;DR: In this paper, a spatial statistical model which can take into account spatial dependency on geographically neighboring areas is constructed from a noise map of a city in South Korea in order to predict the noise level of road-traffic in urban area.

Journal ArticleDOI
TL;DR: The kernel regression as well as the local linear regression are compared to typical inversion techniques, namely Matched Field Beamforming and the algorithm MUSIC and it is shown that the machine learning approaches may outperform the inversion Techniques.

Journal ArticleDOI
TL;DR: Diagnosis of a MGB planetary bearing with seeded defect was investigated and results indicate that the seeded planetary bearing defect was successfully detected in both test cases.

Journal ArticleDOI
TL;DR: Simulation results demonstrate that the optimum control filters derived under general conditions can lead to similar global noise reduction to those derived based on the mixed-error approach.

Journal ArticleDOI
TL;DR: In this article, sound absorption properties of Antiaris toxicaria bark cloth and the thermal insulation properties of the barkcloth epoxy laminar composites were characterized using sound absorption models.

Journal ArticleDOI
TL;DR: In this article, the wave propagation in a periodic array of micro-perforated tube mufflers is investigated theoretically, numerically and experimentally, and the results indicate that the periodic structure can influence the performance of multiple micro-forated mufflers.

Journal ArticleDOI
TL;DR: In this article, the authors used Vibro-Acoustic Emission (VAE) monitoring to investigate signal processing techniques that quantify leak flow rate, including Root Mean Square (RMS), peak in magnitude of the power spectral density and octave banding.

Journal ArticleDOI
Mengyu Chai1, Jin Zhang1, Zaoxiao Zhang1, Quan Duan1, Guangxu Cheng1 
TL;DR: In this article, the authors focused on the study of the stages IIa and IIb in Paris region of fatigue crack growth (FCG) for base metal and weld specimens of 316LN stainless steel by using acoustic emission (AE) technique.

Journal ArticleDOI
TL;DR: In this paper, a simulation model is proposed and developed for predicting the sound insulation performance of ventilation windows in buildings, which complies with the laboratory measurement standard ISO 10140, and the sound reduction index is calculated from the difference between the source and receiving sound power levels in the one-third octave band.

Journal ArticleDOI
TL;DR: The main issues related to the design of the system configuration in the pilot area of Rome are described, which include the presence of multiple noise sources, roads junctions, traffic and weather conditions, that require a different system’s implementation approach.

Journal ArticleDOI
TL;DR: In this article, the efficiency of two different sizes of oil palm kernel shell (KS) and cockle shell (CS) as partial replacement of natural coarse aggregate for sound absorption of pervious concrete was discussed.