Open Access
ARTICLE
Lamia Bouafif1, Noureddine Ellouze2,*
Sound & Vibration, Vol.54, No.1, pp. 1-15, 2020, DOI:10.32604/sv.2020.08665
Abstract In order to assist physically handicapped persons in their movements,
we developed an embedded isolated word speech recognition system (ASR)
applied to voice control of smart wheelchairs. However, in spite of the existence
in the industrial market of several kinds of electric wheelchairs, the problem
remains the need to manually control this device by hand via joystick; which limits
their use especially by people with severe disabilities. Thus, a significant number
of disabled people cannot use a standard electric wheelchair or drive it with
difficulty. The proposed solution is to use the voice to control and drive the wheelchair
instead… More >
Open Access
ARTICLE
Parvin Nassiri1, Sajad Zare2,*, Mohammad Reza Monazzam1, Akram Pourbakht3, Rasoul Hemmatjo4, Hossein ElahiShirvan2
Sound & Vibration, Vol.54, No.1, pp. 17-25, 2020, DOI:10.32604/sv.2020.08395
Abstract Exposure to noise can lead to anatomical, nonauditory, and auditory
impacts. The auditory influence of noise exposure is manifested in the form of
Noise-induced hearing loss (NIHL). The current study aimed at present a signal
to noise ratio model of otoacoustic emission of rats’ ears in the light of the combined
effect of sound pressure level, sound frequency, exposure time, and potassium
concentration of the used water. In total, 36 adult male rates, whose age
varied from 3 to 4 months and had a weight of 200 ± 50 g, were randomly divided
into 12 groups, with each group consisting… More >
Open Access
ARTICLE
A. K. Sahu1, M. Pradhan1, C. R. Mohanty2, P. K. Pradhan1,*
Sound & Vibration, Vol.54, No.1, pp. 27-42, 2020, DOI:10.32604/sv.2020.08586
Abstract Noise pollution is one of the major public health problems in urban
areas throughout the world. Noise is unwanted sound which produces undesirable
problems in day to day life of human being (e.g., physiological and psychological
problems). Rapid increase of the industrialization, urbanization, infrastructure,
volume of motor vehicles, and increase in the road networks brought noise pollution
to the highest level of disaster in a current situation. In urban areas, road traffic
noise plays commanding role among all noise sources and affects the exposed
inhabitants. The present work is done to evaluate and assess the traffic noise and
its effects… More >
Open Access
ARTICLE
Ali Safari Variani1, Ali Dastamoz1, Sajad Zare2, Ahmad Nikpey1, Saeid Ahmadi1,*
Sound & Vibration, Vol.54, No.1, pp. 43-55, 2020, DOI:10.32604/sv.2020.08636
Abstract This work investigated multiple jet nozzles with various geometrical
shape, number of exits, and material on reducing noise radiated from jet flows.
Nozzles are categorized in two groups with few and many exit numbers, each
with various exit shapes, slot and circular, and geometry. Firstly, nozzles are
designed and then fabricated by a 3D printer, Form Labs, Form2USA, with polymeric
resin. Also, the nozzle with the most noise reduction made of stainless steel.
Noise and air thrust were measured at three air pressure gauges, 3, 5, 7 BAR
and directions from nozzle apex, 30°, 90°, 135°. Nozzles with slot exit… More >
Open Access
ARTICLE
T. Jayasree1,*, R. Prem Ananth2
Sound & Vibration, Vol.54, No.1, pp. 57-74, 2020, DOI:10.32604/sv.2020.08573
Abstract Vehicles generate dissimilar sound patterns under different working
environments. These generated sound patterns signify the condition of the
engines, which in turn is used for diagnosing various faults. In this paper, the
sound signals produced by motorcycles are analyzed to locate various faults.
The important attributes are extracted from the generated sound signals based
on time, frequency and wavelet domains which clearly describe the statistical
behavior of the signals. Further, various types of faults are classified using the
Extreme Learning Machine (ELM) classifier from the extracted features. Moreover,
the improved classification performance is obtained by the combination of
feature sets… More >
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