Open Access
ARTICLE
Kurthan Kersch1,*, Elmar Woschke2
Sound & Vibration, Vol.54, No.2, pp. 75-84, 2020, DOI:10.32604/sv.2020.08909
Abstract This work aims to improve the setup of an electrodynamic triaxial
shaker prototype with respect to its usability for the automotive industry. Triaxial
shakers being capable of meeting the corresponding requirements are not
available as standard test equipment. Modifications on the fixture have to be
conducted in order to ensure an effective control. The first part of the work is
the qualitative description of the system behavior. Therefore, the shaker is treated
as a black box. The second part is the modification of the test fixture in order to
handle the resonances of the shaker, which is elementary for its… More >
Open Access
ARTICLE
T. Asakura*, K. Shindo
Sound & Vibration, Vol.54, No.2, pp. 85-98, 2020, DOI:10.32604/sv.2020.08119
Abstract A number of studies have been conducted on the improvement of the
sound quality of electrical artificial laryngeal speech, the speech produced has
been difficult to hear compared to a natural voice. For this reason, it is necessary
to effectively improve the frequency characteristics of the input signal. In the present study, to improve the sound quality of vocalization using an electrical artifi-
cial larynx, first, a comparison of the frequency characteristics between the real
and artificial voices was conducted, and three filters that can make the frequency
characteristics of the artificial voice closer to those of a real voice… More >
Open Access
ARTICLE
Hossein ElahiShirvan1, MohammadReza Ghotbi-Ravandi2, Sajad Zare3,*, Mostafa Ghazizadeh Ahsaee4
Sound & Vibration, Vol.54, No.2, pp. 99-112, 2020, DOI:10.32604/sv.2020.08839
Abstract Workers’ exposure to excessive noise is a big universal work-related
challenges. One of the major consequences of exposure to noise is permanent
or transient hearing loss. The current study sought to utilize audiometric data to
weigh and prioritize the factors affecting workers’ hearing loss based using the
Support Vector Machine (SVM) algorithm. This cross sectional-descriptive study
was conducted in 2017 in a mining industry in southeast Iran. The participating
workers (n = 150) were divided into three groups of 50 based on the sound pressure level to which they were exposed (two experimental groups and one control
group). Audiometric tests… More >
Open Access
ARTICLE
Nan Wu1,#, Kuan Lu1,2,#,*, Yulin Jin2,3,*, Haopeng Zhang1, Yushu Chen2
Sound & Vibration, Vol.54, No.2, pp. 113-125, 2020, DOI:10.32604/sv.2020.09783
Abstract Two different order reduction methods of the deterministic and stochastic systems are discussed in this paper. First, the transient proper orthogonal
decomposition (T-POD) method is introduced based on the high-dimensional nonlinear dynamic system. The optimal order reduction conditions of the T-POD
method are provided by analyzing the rotor-bearing system with pedestal looseness fault at both ends. The efficiency of the T-POD method is verified via comparing with the results of the original system. Second, the polynomial dimensional
decomposition (PDD) method is applied to the 2 DOFs spring system considering
the uncertain stiffness to study the amplitude-frequency response. The numerical
results… More >
Open Access
ARTICLE
Rohollah Fallah Madvari1, Mohammad Reza Monazzam2, Mohsen Niknam Sharak3, Mohsen Mosa Farkhani4,*
Sound & Vibration, Vol.54, No.2, pp. 127-137, 2020, DOI:10.32604/sv.2020.08158
Abstract Honeycomb structures have recently, replaced with conventional homogeneous materials. Given the fact that sandwich panels containing a honeycomb
core are able to adjust geometric parameters, including internal angles, they are
suitable for acoustic control applications. The main objective of this study was
to obtain a transmission loss curve in a specific honeycomb frequency range along
with same overall dimensions and weight. In this study, a finite element model
(FEM) in ABAQUS software was used to simulate honeycomb panels, evaluate
resonant frequencies, and for acoustic analysis. This model was used to obtain
acoustic pressure and then to calculate the sound transmission… More >