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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
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Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 17, Issue 12 - Dec 2007
Volume 17, Issue 11 - Nov 2007
Volume 17, Issue 10 - Oct 2007
Volume 17, Issue 9 - Sep 2007
Volume 17, Issue 8 - Aug 2007
Volume 17, Issue 7 - Jul 2007
Volume 17, Issue 6 - Jun 2007
Volume 17, Issue 5 - May 2007
Volume 17, Issue 4 - Apr 2007
Volume 17, Issue 3 - Mar 2007
Volume 17, Issue 2 - Feb 2007
Volume 17, Issue 1 - Jan 2007
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Three-dimensional Rotordynamic Analysis Considering Bearing Support Effects
Park, Hyo-Keun ; Kim, Dong-Man ; Kim, Yu-Sung ; Kim, Myung-Kuk ; Chen, Seung-Bae ; Kim, Dong-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 105~113
DOI : 10.5050/KSNVN.2007.17.2.105
In this study, three-dimensional rotordynamic analyses have been conducted using equivalent beam, hybrid and full three-dimensional models. The present computational method is based on the general finite element method with rotating gyroscopic effects of the rotor system. General purpose commercial finite element code, SAMCEF which includes practical rotordynamics module with various types of rotor analysis tools and bearing elements is applied. For the purpose of numerical verification, comparison study for a benchmark rotor model with support bearings is performed first. Detailed finite element models based on three different modeling concepts are constructed and then computational analyses are conducted for the realistic and complex three-dimensional rotor system. The results for rotor stability and mass unbalance response are presented and compared with the experimental vibration test data conducted herein.
Vibration Monitoring and Power Performance Evaluation of a Small Stand-alone Wind Turbine Generator
Yoo, N.S. ; Kim, Yoon-Ho ; Kim, Seock-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 114~120
DOI : 10.5050/KSNVN.2007.17.2.114
Vibration performance of a 6 kW stand-alone wind turbine(W/T) generator is investigated under the wind environment of Daegwanryung mountain area. In the W/T, wind condition, power performance and structural stability are correlated each other An integrated monitoring system which consists of accelerometers, anemometers, power meters and auxiliary sensors for atmospheric data are constructed to measure the required data simultaneously. Based upon the data acquired over a long period of time, vibration performance of the W/T structure is estimated with annual wind data and generating power performance. Within the operating speed range, possibility of severe nitration is diagnosed. Vibration sources are identified and countermeasures are proposed. The goal of the study is to offer the basic information on W/T vibration performance at the design stage of a small stand alone W/T structure.
Wave Models and Experimental Studies of Beam-plate-beam Coupled Systems for a Mid-frequency Analysis
Yoo, Ji-Woo ; Thompson, D.J. ; Ferguson, N.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 121~129
DOI : 10.5050/KSNVN.2007.17.2.121
There has been much effort to find suitable methods for structural analysis in the mid-frequency region where traditional low frequency methods have increasing uncertainties whilst statistical energy analysis is not strictly applicable. Systems consisting of relatively stiff beams coupled to flexible plates have a particularly broad mid-frequency region where the beams support only a few modes whilst the plate has a high modal density and modal overlap. A system of two parallel beams coupled to a plate is investigated based on the wave method, which is an approximate method. Muller's method is utilised for obtaining complex roots of a dispersion wave equation, which does not converge in the conventional wave method based on a simple iteration. The wave model is extended from a single-beam-plate system, to a plate with two identical beams which is modelled using a symmetric-antisymmetric technique. The important hypothesis that the coupled beam wavenumber is sufficiently smaller than the plate free wavenumber is experimentally verified. Finally, experimental results such as powers and energy ratios show the validity of the analytical wave models.
A Study of Natural Frequency of Offshore Wind Turbine JACKET
Lee, Kang-Su ; Lee, Jung-Tak ; Son, Choong-Yul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 130~135
DOI : 10.5050/KSNVN.2007.17.2.130
The purpose of this paper is that investigates the Natural Frequency behavior characteristic of wind turbine jacket type tower model, and calculated that the stress values of thrust load, wave load, wind load, current loda, gravity load, etc., environment evaluation analysis during static operating wind turbine jacket type tower model, carried out of natural frequency analysis of total load case to stress matrix, frequency calculated that calculated add natural frequency to stiffness matrix for determinant to stress results. The finite element analysis is performed with commercial F.E.M program (ANSYS) on the basis of the natural frequency and mode shape.
A Study on the Prediction of the Radial Noise Generated by Structural Vibration of the Fuel Tank in LPG Vehicle
Kim, Tae-Yong ; Kim, Sung-Jong ; Lee, Dae-Yup ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 136~142
DOI : 10.5050/KSNVN.2007.17.2.136
Fuel tank noise of the LPG vehicle is getting more important for reduction of vehicle noise, because major noise of the vehicle was reduced. Therefore, in this paper, Fuel tank noise and vibration are measured, then the modal analysis is applied for prediction of fuel tank noise. To predict fuel tank noise, various methods are applied by using FEM and BEM techniques.
A Study on the Factor of Flanking Noise in the Wall
Chung, J.Y. ; Jeong, G.C. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 143~148
DOI : 10.5050/KSNVN.2007.17.2.143
This study examines the influence factor of flanking noise in the wall. Generally, there is the difference of airborne sound isolation between laboratory and field test. The purpose of this study is examing the cause of droping sound insulation performance in the field and searching the method of improving sound insulation performance. First, we measured the sound isolation in the wall at the lab. Then, we measured it in the field and compared them. At the base of these datum, we measured the flanking noise and solid transmission. For the flanking noise in the wall, we used intensive method. So, we found the influence of solid transmission.
A Study on the Acoustic Characteristic of the Light Weight Concrete Panel Using Bottom Ash
Jeong, G.C. ; Chung, J.Y. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 149~154
DOI : 10.5050/KSNVN.2007.17.2.149
Recently, the method of the apartment building design is changing from wall type to moment structure. Dry walls are used plentifully. Until now, the gypsum board is used mainly but it has many problems. For improving the problems, the light weight concrete panel using cement board is used recently. The purpose of this study is to obtain basic data for the light weight concrete panel using bottom ash. As a result, some structures satisfies domestic standard concerned with sound insulation between households at the laboratory and field test.
Effects of Measurement Method for Vehicle Speed on the Prediction Results of Noise Map
Park, In-Sun ; Park, Sang-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 155~159
DOI : 10.5050/KSNVN.2007.17.2.155
Noise map presents new alternatives of noise reduction counter measure and becomes important tool for making environmental policy. Many input factors such as road conditions, number of vehicles, speeds of vehicles are used for noise prediction of the noise map. However, results of noise prediction make difference depending on the values of the input factors. In this study, it researched effect of measurement method for vehicle speeds on the prediction results of the noise map.
The Environmental Auditory and Visual Information Effects on the Traffic Noise Perception by Using Electroencephalogram
Jang, Gil-Soo ; Park, Sa-Keun ; Song, Min-Jeong ; Shin, Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 160~167
DOI : 10.5050/KSNVN.2007.17.2.160
In this study, the influences of environmentally friendly visual and auditory information on traffic noise perception were surveyed by the using electroencephalogram. Green rural region image and CBD (central business district) image in urban city were used as visual informations. And traffic noise, signal and environmental music were used to detect the impact on electroencephalogram variance. It was revealed that green rural region image caused
ratio increase about 10% and environmental music increased
. The results of this study improved that environmentally friendly visual and auditory information had an effect on decreasing traffic noise loudness to some extents.
Noise Reduction Effect of an Air Bubble Layer on an Infinite Flat Plate
Kim, Jong-Chul ; Oh, Joon-Seok ; Cho, Dae-Seung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 168~176
DOI : 10.5050/KSNVN.2007.17.2.168
The mixture sound speed in bubbly fluids is highly dispersive due to differences of the density and compressibility between bubbles and fluids. The dispersion range in bubbly fluids expands to a higher frequency than the resonance frequency of an air bubble. A theoretical model was developed to compute the reduction of radiation noise that is generated by a force applied on an infinite flat plate using a bubble layer as a compliant baffle. For evaluating the effectiveness of a bubble layer in reducing the structure-borne noise of an infinite elastic plate, the noise reduction levels for various parameters such as the thickness of bubble layers, the volume fractions and the distribution types of bubbly fluids are calculated numerically. The noise reduction effect of an air bubble layer on an infinite flat plate is considerable level and similar to the tendency of dispersion of bubbly fluids. It is recommended that the thickness of a bubble layer should be increased with keeping an appropriate volume fraction of an air bubble for the most effective reduction of the radiation noise.
An Experimental Study of Tridirectional Vibration of Helical Gears with Different Contact Ratios
Park, Chan-Il ; Jeon, Don-Hyuk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 177~184
DOI : 10.5050/KSNVN.2007.17.2.177
The purpose of this study is to investigate experimentally the characteristics of rotational, radial, and axial vibration for helical gears with different contact ratios. For this purpose, the gear box is specially designed and manufactured. Two helical gears with different face widths and reduction ratios are investigated. The gear vibration in each direction is measured by accelerometers attached to the gear body. Rotational vibration is the highest and radial vibration is the lowest in the gear frequencies. While the increase of rotational speed increases gear vibration, it does not always increase with torque. It is not also linearly related to the contact ratio. In addition, axial vibration is not proportional to rotational vibration.
Application of Numerical Differentiation Using Differential Quadrature (DQ) to Curved Member-like Structural Analysis
Lee, Byoung-Koo ; Oh, Sang-Jin ; Lee, Tae-Eun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 2, 2007, Pages 185~193
DOI : 10.5050/KSNVN.2007.17.2.185
This paper deals with the application of the numerical differentiation using the differential quadrature(DQ) in the curved member-like structural analysis. Derivative values of the geometry of structure are definitely needed for analyzing the structural behavior. For verifying the numerical differentiation using DQ, free vibration problems of arch are selected. Terms of curvature composed with the derivatives of arch geometry obtained herein are agreed quite well with exact values obtained explicitly. Natural frequencies subjected to terms of curvature obtained by DQ are agreed quite well with those in the literature. The numerical differentiation using DQ can be practically utilized in the structural analysis.