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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society for Noise and Vibration Engineering
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 20, Issue 12 - Dec 2010
Volume 20, Issue 11 - Nov 2010
Volume 20, Issue 10 - Oct 2010
Volume 20, Issue 9 - Sep 2010
Volume 20, Issue 8 - Aug 2010
Volume 20, Issue 7 - Jul 2010
Volume 20, Issue 6 - Jun 2010
Volume 20, Issue 5 - May 2010
Volume 20, Issue 4 - Apr 2010
Volume 20, Issue 3 - Mar 2010
Volume 20, Issue 2 - Feb 2010
Volume 20, Issue 1 - Jan 2010
Selecting the target year
A Study on the Test Method for Noise Reduction Devices Installed on the Noise Barriers
Kim, Chul-Hwan ; Chang, Tae-Sun ; Kim, Deuk-Sung ; Kim, Dong-Jun ; Chang, Seo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 791~796
DOI : 10.5050/KSNVE.2010.20.9.791
Installing noise barriers is the most common method for reducing the highway traffic noise to the road side residential area. After the report about edge potential concept of a noise barrier, various types of noise reducing devices(NRDs) called "noise reducers" have been suggested for getting more shielding effect on the top of highway noise barriers. But, it has been doubtful about effect of the NRDs in field because there was no appropriate and unified method to estimate the acoustic performance by using field measurement of the NRDs in Korea. In this study, the authors have considered to setup a practical method to test and estimate the acoustic performance of NRDs. For eliminating the noise reduction effect of the NRDs height itself, the source and measuring points are adjusted as highly as the NRDs height. For the frequency weighting in the estimation of the NRDs effect, the highway noise spectra were measured at asphalt and concrete road side and then averaged for a unit spectral parameter.
A Study on the Propagation and Attenuation Properties of the Military Construction Equipments Noise
Ju, Duck-Hoon ; Kim, Jae-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 797~804
DOI : 10.5050/KSNVE.2010.20.9.797
In case of the construction equipment using by the military camp, such equipments are different from those equipments using at general construction site, of which muffler(silencer) is attached at the passenger seat side, since such equipments are obsoleted, it is great part that a considerably loud noises are continuously diffusing. When working, such noise can be influenced a lot of effects to those working soldiers nearby the equipment, and though it is really terrible loud noise as much as can arise a civil complaints by neighboring civilians, but because its specialty of the military, it is real state that there are many difficulties in establishing an effective soundproof countermeasure due to study shortage and lack of the relevant material regarding to military construction equipment. Accordingly, this study has ever grasped the characteristics of noise by its each frequencies and by distances about those 9 kinds of construction equipments using chiefly by the military camp. As the result, it was known that the military construction equipment is generating the loud noise which can influence bad effect to the workers, and such high sound pressure level of low frequency band can harm even to far distance.
Flow-induced Instability of Multi-wall Carbon Nanotubes for Various Boundary Conditions
Yun, Kyung-Jae ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 805~815
DOI : 10.5050/KSNVE.2010.20.9.805
This paper studies the influence of internal moving fluid and flow-induced structural instability of multi-wall carbon nanotubes conveying fluid. Detailed results are demonstrated for the variation of natural frequencies with flow velocity, and the flow-induced divergence and flutter instability characteristics of multi-wall carbon nanotubes conveying fluid and modelled as a thin-walled beam are investigated. Effects of various boundary conditions, Van der Waals forces, and non-classical transverse shear and rotary inertia are incorporated in this study. The governing equations and three different boundary conditions are derived through Hamilton's principle. Numerical analysis is performed by using extended Galerkin's method which enables us to obtain more exact solutions compared with conventional Galerkin's method. This paper also presents the comparison between the characteristics of single-wall and multi-wall carbon nanotubes considering the effect of van der Waals forces. Variations of critical flow velocity for different boundary conditions of two-wall carbon nanotubes are investigated and pertinent conclusion is outlined.
Propagation Characteristics of High-frequency Waves in an Elastic Waveguide
Lee, Jung-Gu ; Kim, Jin-Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 816~821
DOI : 10.5050/KSNVE.2010.20.9.816
The paper presents a theoretical analysis on the propagation characteristics of the high-frequency wave in an elastic waveguide whose diameter is less than or similar to the wavelength. The theoretical results were verified by comparing them with the numerical results obtained by the boundary-element method. The ratio of the waveguide diameter to the wavelength affects the number of the existing wavenumber, and thus it affects the propagation characteristics. In the media with attenuation, the trend is similar to that in the media without attenuation except the decreasing amplitude.
An Experimental Study on the Influence of the Internal Cavity and Gap on the Bell Acoustics
Jeong, Won-Tae ; Kang, Yeon-June ; Kim, Seock-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 822~827
DOI : 10.5050/KSNVE.2010.20.9.822
In this study, it is experimentally investigated how bell acoustics are influenced by the internal cavity of the bell and the gap between the bell bottom and the floor. Acoustic transmission function and natural frequency of a test bell are measured and analysed. Experimental study is conducted to evaluated how the resonance effect influences the bell sound and how the bell sound is different according to the striking condition and the measurement direction. Acoustic resonance frequency of the cavity-gap system is predicted by boundary element analysis using SYSNOIS and the validity of the predicted result is verified by experiment. The result of the study could be applied to determine the optimal gap size which makes the bell sound strong and long.
Steam Leak Detection by Using Image Signal
Choi, Young-Chul ; Son, Ki-Sung ; Jeon, Hyeong-Seop ; Park, Jin-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 828~833
DOI : 10.5050/KSNVE.2010.20.9.828
Steam leakage is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. In this paper, we proposed the method for the detecting steam leakage by using image signal processing. Our basic idea come from heat shimmer which shine with a soft light that looks as if it shakes slightly. To test the performance of this technique, experiments have been performed for simple heat source and steam generator. Results show that the proposed technique is quite powerful in the steam leak detection.
Sound Reduction Index of Interior Door by Aperture Sizes at Door's Bottom
Kim, Myung-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 834~840
DOI : 10.5050/KSNVE.2010.20.9.834
The Sound reduction indices(SRIs) of interior door with 13 different size apertures are measured in acoustic chamber. Also, as a theoretical approach, the SRIs are estimated using Gomperts' theory. In this study, the aperture of interior door is focused on the lower part of door leaf which is well known as a main cause to deteriorate the sound insulation performance of door. The results show that the SRI of door strongly depends on the aperture width and the dip in the measured sound reduction index curve by the resonance effect within aperture is observed at high-frequency. On the whole, the values calculated by theory are in good agreement with the measured values including the position of resonance dip. The average difference between the measured and the calculated values is 0.9 dB for 13 doors with different size aperture in terms of the weighted SRI.
Study on the Elimiation of Irreversible Magnetic Components Using Anhysteretization in a Magnetostrictive Vibration Sensor
Lee, Ho-Cheol ; Bae, Won-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 841~848
DOI : 10.5050/KSNVE.2010.20.9.841
Previous experimental results show that the magnetostrictive transducer has the peculiar characteristic with relation to their reversible magnetization and its practical usage will be hindered by this phenomena. In this paper, the idea of anhysteretization is adopted in order to solve this problem. The experimental results reveal that the anhysteretization can get rid of the extraordinary phenomena which are occurred by the change of biasing magnetic field. The effects of two important parameters, which are the amplitude and the decaying time of this process, on the anhysteretization are investigated experimentally. Finally the best operating condition is proposed in order to maximize the sensitivity under the anhysteretization.
Nonlinear Oscillation Characteristics in Combination Resonance Region Considering Damping Effects
Jeong, Tae-Gun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 849~855
DOI : 10.5050/KSNVE.2010.20.9.849
Damping may change the response characteristics of nonlinear oscillations due to the parametric excitation of a thin cantilever beam. When the natural frequencies of the first bending and torsional modes are of the same order of magnitude, we can observe the one-to-one combination resonance in the perturbation analysis depending on the characteristic parameters. The nonlinear behavior about the combination resonance reveals a chaotic motion depending on the natural frequencies and damping ratio. We can analyze the chaotic dynamics by using the eigenvalue analysis of the perturbed components. In this paper, we derived the equations for autonomous system and solved them to obtain the characteristic equation. The stability analysis was carried out by examining the eigenvalues. Numerical integration gave the physical behavior of each mode for given parameters.
Vibration Power Flow Analysis of Coupled Co-planar Orthotropic Plates
Song, Jee-Hun ; Park, Do-Hyun ; Hong, Suk-Yoon ; Kil, Hyun-Gwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 856~862
DOI : 10.5050/KSNVE.2010.20.9.856
In this paper, the power flow analysis(PFA) method was developed to predict the vibrational responses of coupled co-planar orthotropic plates in frequencies ranging from medium to high. To cover the power transmission and reflection at the joint of the orthotropic plates, the wave transmission approach is applied with the assumption that all the incident waves are normal to the joint. Through numerical analyses, the power flow energy density and intensity fields of coupled co-planar orthotropic plates were compared with those of classical modal solutions by changing the frequency and internal loss factor, and they show good agreement in terms of the global decay and the attenuation patterns of the energy density.
Study on Application of Spatial Signal Processing Techniques to Wavenumber Analysis of Vibration Data on a Cylindrical Shell
Kil, Hyun-Gwon ; Lee, Chan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 9, 2010, Pages 863~875
DOI : 10.5050/KSNVE.2010.20.9.863
The vibration of a cylindrical shell is generated due to elastic waves propagating on the shell. Those elastic waves include propagating waves such as flexural, longitudinal and shear waves. Those also include non-propagating decaying waves, i.e. evanescent waves. In order to separate contributions of each type of waves to the data for the vibration of the cylindrical shell, spatial signal processing techniques for wavenumber analysis are investigated in this paper. Those techniques include Fast Fourier transform(FFT) algorithm, Extended Prony method and Overdetermined Modified Extended Prony method(OMEP). Those techniques have been applied to identify the waves from simulated vibration signals with various signal-to-noise ratios. Futhermore, the experimental data for in-plane vibration of the cylindrical shell has been processed with those techniques to identify propagating waves(longitudinal, shear and flexural waves) and evanescent waves.