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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
Editor in Chief :
Volume & Issues
Volume 25, Issue 12 - Dec 2015
Volume 25, Issue 11 - Nov 2015
Volume 25, Issue 10 - Oct 2015
Volume 25, Issue 9 - Sep 2015
Volume 25, Issue 8 - Aug 2015
Volume 25, Issue 7 - Jul 2015
Volume 25, Issue 6 - Jun 2015
Volume 25, Issue 5 - May 2015
Volume 25, Issue 4 - Apr 2015
Volume 25, Issue 3 - Mar 2015
Volume 25, Issue 2 - Feb 2015
Volume 25, Issue 1 - Jan 2015
Selecting the target year
Study Concerning Preference for Noise Quality of Automotive Horn for Improvement of Perceived Quality and Improvement of New Noise Metric
Kang, Hee-Su ; Lee, Sang-Kwon ; Shin, Tae-Jin ; Jung, Ki-Woong ; Park, Dong-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 141~149
DOI : 10.5050/KSNVE.2015.25.3.141
In this study, there is an investigation about the sound quality of automotive horn that attached to luxury sedans. In order to define a questionnaire of horn sound quality the factor analysis is conducted. Ten automotive horns are selected for this research and ten passenger cars(nine is luxury sedan and one economy class car). Luxury is used for the questionnaire as an attribute for the sound quality of car horn. The interior noises for ten test cars are recorded and used for the subjective analysis of car horn sound. In the paper, new sound metric for the car horn sound is presented. The new sound metric is used for the objective sound index for the prediction of subjective sound quality of car horn.
An Experimental Study on Frequency Characteristics of the Microphone Array Covered with Kevlar in Closed Test Section Wind Tunnel
Hwang, Eun-Sue ; Choi, Youngmin ; Kim, Yangwon ; Cho, Taehwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 150~159
DOI : 10.5050/KSNVE.2015.25.3.150
An experimental study on frequency characteristics of the microphone array covered with Kevlar sheet was conducted in the closed test section. Microphones that were flush-mounted in the wall of wind tunnel were subjected to very high flow noise resulting from the turbulence in the wall boundary layer. This noise interference by the boundary layer was referred as 'a microphone self-noise' and various approaches were studied to reduce this interference. Recessed microphone array with high tensioned cover was one of the good approaches to reduce this self-noise. But, the array cover could cause an unexpected interference to the measuring results. In this paper the frequency characteristics of the microphone array with Kevlar cover was experimentally studied. The white noise was used as a reference noise source. Three kinds of tensions for the Kevlar cover were tested and those results were compared with the test results without the Kevlar cover. The gap effect between the cover and microphone head was also tested to find out the proper position of microphone in the array module. Test results show that the mid-tension and 10mm gap was the best choice in the tested cases.
A Study on Vibration Isolation Technique of Building-augmented Wind Turbine
Lee, Jong Won ; Moon, Seok-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 160~168
DOI : 10.5050/KSNVE.2015.25.3.160
Vibration issue of a building structure due to a wind turbine should be resolved for the application of building-augmented wind turbine. In this study, a dynamic analysis for an horizontal-axis upwind wind turbine is carried out to calculate vibration excited to an example building structure. Characteristics of vertical vibration transfer of the building structure are analytically studied and compared with a criteria. Then, a method to isolate the vibration is presented by analyzing the vibration characteristics of the wind turbine, and verified by applying to the building structure.
Dynamic Stiffness Design of Inspection Robot Frame Using Multi-body Dynamic Simulation
Lee, Jun Young ; Kim, Moon Young ; Lim, Ji Youn ; Kim, Chang Hwan ; Yim, Hong Jae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 169~175
DOI : 10.5050/KSNVE.2015.25.3.169
This study aims to improve the dynamic stiffness of an inspection robot frame to prevent derailment from transmission lines. Finite element models for the transmission lines and robot frame are developed for the multi-body dynamic simulation. Natural frequency analysis was conducted using the FE models. Three types of spacer damper clamps installed on 4-conductor transmission lines are used to evaluate the derailment of the robot. Multi-body dynamic simulations with FE models are demonstrated for sub-span oscillation. When the robot operates, derailment of inspection robot from the transmission lines is determined because of resonance. To prevent the resonance, body position was changed and thickness optimization was conducted. The results show that derailment was not occurred because of the natural frequency improvement.
Fatigue Life Estimation of Solid-state Drive due to the Effect of Dummy Solder Ball under Forced Vibration
Lee, Juyub ; Jang, Gunhee ; Jang, Jinwoo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 176~183
DOI : 10.5050/KSNVE.2015.25.3.176
This research proposes a method to estimate the fatigue life of SSD(solid-state drive) due to the effect of dummy solder ball under forced vibration. A finite element model of the SSD was developed to simulate the forced vibration and a modal testing was performed to verify the developed finite element model. Fatigue life of the SSD under vibration was experimentally determined according to JEDEC standard in which the SSD was excited by a sinusoidal sweep vibration within the narrow frequency band around the first natural frequency until the SSD fails. Basquin's equation was introduced to estimate the fatigue life of the SSD due to the effect of dummy solder balls. It shows that the dummy solder balls are effective elements of the SSD to increase the fatigue life of an SSD by increasing 700 times of the fatigue life of the given SSD.
Experimental Evaluation of Direct Measurement for Excitation Forces Acting on the Hard-points of Suspension System to Predict Road-noise Performance
Kang, Yeon June ; Kim, Heesoo ; Song, David P. ; Ih, Kang-Duck ; Kim, HyoungGun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 184~190
DOI : 10.5050/KSNVE.2015.25.3.184
NVH engineering has become a hot issue due to radical technology changes and development in automotive industry since customers' expectations and needs for their vehicle is taken to a higher level. However, the source identification and quantification of the road noise within a vehicle is still not at the level where it needs to be to meet their expectations due to its' complex transfer path and difficulties in path optimization. The primary focus of this research is on direct force obtaining method at suspension hard points using suspension test rig. Directly obtained forces at suspension to body mounting points are critical and crucial for determining the effects of design changes of the suspension has on road noise performance. Direct force obtaining method has its limitation in sensor installation within an actual vehicle therefore, many has been indirectly calculating forces using full matrix inversion method or dynamic stiffness method. In this study, to circumvent this limitation, a suspension rig is used. Then, the suspension rig is verified through a comparative analysis of its dynamic behavior between the actual vehicle by cleat test on chassis dynamometer.
Active Control of Noise Propagated through Ventilation Openings of Enclosures Using an FIR Filter
Ji, Sumin ; Hong, Chinsuk ; Jeong, Weui-Bong ; Kim, Tae-Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 191~198
DOI : 10.5050/KSNVE.2015.25.3.191
Noise propagated through the ventilation openings of enclosures is actively controlled using an FIR filter. The enclosures considered in this paper are used for isolating noise due to machinery. This method is of limited use because of the ventilation openings through which most of noise is propagated. Feedforward control strategy is incorporated to minimize the acoustic power propagated through the openings. For the real-time implementation, although it is numerical study, the controller is implemented using an FIR filter. The acoustic transfer functions of the pressure on the openings of the enclosure to the primary source and to the secondary source are numerically calculated using the boundary element method. The performance analysis of the active control is conducted with the time-domain simulation using Matlab Simulink.
Vibration Characteristics of Stacked Piezoelectric Transducers
Kim, Dae Jong ; Kim, Jin Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 199~206
DOI : 10.5050/KSNVE.2015.25.3.199
This paper deals with the vibration characteristics of stacked transducers composed of piezoelectric discs, which are main elements of ultrasonic sensors or actuators. The stacked transducers were devised in the sense of natural frequencies. Two- or three-layer transducers were fabricated with piezoelectric discs of different diameters. The natural frequencies were determined by the finite element analysis and they were verified by comparing them with experimental results. It appeared that the natural frequencies of the stacked piezoelectric transducers include the natural frequencies of the constituent piezoelectric discs and the natural frequencies caused by stacking. Based on these results, it would be possible to predict the vibration characteristics of the stacked piezoelectric transducers in a design process.
Hydroelastic Vibration of a Rectangular Tank Partially Surrounding with a Liquid
Jeong, Kyeong-Hoon ; Kim, Jong-Wook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 3, 2015, Pages 207~215
DOI : 10.5050/KSNVE.2015.25.3.207
This paper deals with a theoretical method to calculate natural frequencies of a fixed-free rectangular tank partially in contact with an outer water gap. Orthogonal polynomials satisfying the boundary conditions of the tank are used as admissible functions in the Rayleigh-Ritz method. A quarter model of the liquid-coupled system is constructed and it is simplified to a line supported flat plate in contact with the liquid. The liquid displacement potential functions satisfying the Laplace equation and water boundary conditions are derived, and the finite Fourier transform is accomplished in conjunction with the compatibility requirement along the contacting interfaces between the tank and water. An eigenvalue problem is derived so that the natural frequencies of the wet rectangular tank can be extracted. The predictions from the proposed analytical method show good agreement with the finite element analysis results.