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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 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
Selecting the target year
Evaluation of the Field Application of "Spontaneous Acoustic Field Reproduction System(SAFRS)" to Propose Soundscape
Kook, Chan ; Jang, Gil-Soo ; Jeon, Ji-Hyeon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 289~297
DOI : 10.5050/KSNVN.2007.17.4.289
SAFRS is the system designed to reproduce the harmonic sound into the space according to the environmental factors. Here the harmonic sound means the sound which judged by the subjective tests, and the methods were suggested in the former studies. In this research, SAFRS was applied into the Square of D University to evaluate and verify the effectiveness of the system and a few evaluations were carried out as follows; 1) sound perception, frequency, volume and harmony with the space, 2) images of the square and acoustic environment and 3) acoustic environment with existing sounds, fountain sound, produced sound by SAFRS, and both of them respectively. The results can be summarized as follows; 1) According to the evaluation on acoustic environment, no relationships were shown between the cognition of sounds produced by SAFRS and the frequency or volume, but inverse proportion was shown between the volume and special harmony. 2) As the result of image evaluation. the relationship between space and sound image was shown proportional only except the evaluation on main road at night time, it means that the sound proposal with the visual contents matching with the sounds would be more effective than the proposal of sound only. 3) Results of evaluation on acoustic environment showed that the cognition effect at night time was shown higher than that of day time when only the acoustic element was given and the effect was increased when the visual elements matches with the acoustic elements if both of them were given. It confirmed the harmony between visual and acoustic elements was very important.
Development of Sound Quality Index of a SUV' Axle for Evaluation of Enhancement of Sound Quality Based on Human Sensibility
Lim, Jong-Tae ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 298~309
DOI : 10.5050/KSNVN.2007.17.4.298
There are various sounds in the car as much as cars have many mechanical parts. These sounds make various psychological development. The international competition in car markets has continuously required the research about the sound quality of a car. The domestic car makers have also invested a lot of money for the research and development of sound quality. Car axle plays an important role in a vehicle and its NVH development is also important. By this time, NVH development of car axle is mainly based on the reduction of sound pressure level (dBA), which cannot gives, the satisfaction to the customers in view of the sound quality of a vehicle. Therefore, in this paper, a sound quality index evaluating the sound quality of axle noise based on human sensibility is developed.
Vibration Transmission Characteristics due to the Variation in the Cross-section of a Waveguide
Kim, Dae-Seung ; Kim, Jin-Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 310~316
DOI : 10.5050/KSNVN.2007.17.4.310
This paper presents a theoretical approach to describe the characteristics of vibration transmission in the waveguide with varying cross-section. The waveguide considered in this paper has a tapered section in the middle of an axisymmetric stepped rod. The distributions of the vibration displacement and stress along the waveguide were derived and they were verified by comparing the theoretically-calculated results with those obtained by the finite-element analysis. The vibration magnification and the concentrated stress under forced vibration were calculated for this rod according to the taper length. The paper established a theoretical basement of designing waveguides for maximizing the vibration transmission under minimum stress concentration.
A Study on the Finite Element Modeling Methods of Large Navy Shipboard Equipment Attached to the Top and Bottom Foundations for DDAM
Song, Oh-Seop ; Kim, Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 317~323
DOI : 10.5050/KSNVN.2007.17.4.317
Non-contact underwater explosions against surface ships could cause extensive equipment damage and render the ship inoperative. As an analytical method, DDAM(dynamic design and analysis method) is used for ship shock design. In this paper, in order to verify the finite element model of large shipboard equipment, modal test of equipment was performed. Major objective of this paper is to describe shock analysis methodology for large shipboard equipment attacked to the top and bottom foundations.
Sensor Placement Method for Damage Identification
Kim, Chung-Hwan ; Kwon, Kye-Si ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 324~332
DOI : 10.5050/KSNVN.2007.17.4.324
Sensor placement method for damage identification has been developed for model updating using Taguchi method. In order to select the optimal sensor location, the analysis of variance of objective function using orthogonal array was carried out. Then, modal data at the selected locations were used for damage identification using model updating. The numerical model of a cantilever beam was used in order to compare the damage identification results with conventional sensor location method.
Waveform Design for Piezo Inkjet via Self- sensing Measurement
Kim, Woo-Sik ; Kwon, Kye-Si ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 333~341
DOI : 10.5050/KSNVN.2007.17.4.333
Waveform design method for inkjet printing has been proposed tv pressure wave measurement. The pressure wane inside the inkjet dispenser can be effectively measured by current measurement due to self-sensing capability of PZT. The pressure wave measured from current was verified by commercially availablelaser vibrometer. In order to obtain high speed inkjet droplets, two pulse waveform was designed such that the pressure wane after droplet formation can be minimized.
Sound Absorption Characteristics and Application Effect of PTFE Membrane Material
Jeong, Jeong-Ho ; Shon, Jang-Ryul ; Kim, Jung-Joong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 342~349
DOI : 10.5050/KSNVN.2007.17.4.342
Following the 2002 World-Cup held in Korea, studies have been actively conducted on plans to utilize all-weather stadiums of fine figures, where large-scale spaces are available for various utilizations. In Japan, dome-type stadiums have been built and are utilizing across the whole nation not only for sports events but also variety of other large-scale events. PTFE(poly tetra fluoro ethylene) is one of the membrane material mainly used for the outer ceiling surface of membrane structures. However, there has not been enough research on the acoustical properties of PTFE membrane material which has been widely used in the multi-purpose stadiums. In this study, air permeability values and sound absorption coefficient of PTFE membrane materials were measured and evaluated in the gymnasium. From the results of measurements of sound absorption coefficient and air permeability of inner membrane materials, it was found that the sound absorption coefficient was good in the air permeability range of
. Also the relation ship between air permeability and sound absorption coefficient was very high and the sound absorption coefficient was the highest in the range of
. Secondly, an analysis on the measurements sound absorption characteristics of inner membrane material reveals that the overall sound absorption coefficient was stabilized(higher than 0.5 throughout the whole frequency bands) when the air space behind the membrane material was deeper than 600 mm. When PTFE sound absorptive membrane material was installed in the ceiling of gymnasium, it was confirmed that sound absorptive membrane material can reduce reverberation and increase speech intelligibility in the gymnasium.
Study for Dynamic Characteristics of the Accelerometer Mounting Fixtures
Lee, Jong-Kyu ; Kim, Sung-Boo ; Lee, Doo-Hee ; Bae, Dong-Myung ; Shin, Chang-Hyuk ; Cho, Seung-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 350~355
DOI : 10.5050/KSNVN.2007.17.4.350
Accelerometer mounting fixtures were prepared with the different materials(Ti and SUS). The dynamic characteristics of the mounting fixture were analyzed by finite element method(FEM), and the mode shape of each order and the displacement response for modelling the mounting fixture were analyzed by ANSYS, then resonant frequencies of the mounting fixtures with Ti and SUS were 22.700 and 23.390 kHz, respectively. The dynamic characteristics of the mounting fixture with the different positions were obtained by using laser interferometer. The response of the accelerometer was nearly a constant from 40 Hz to 500 Hz, but the change of the acceleration was increased with an increase of the frequency above 500 Hz.
Finite Element Analysis of Magnetostrictive Linear Actuator
Kim, Yoon-Chang ; Kim, Jae-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 356~362
DOI : 10.5050/KSNVN.2007.17.4.356
Magnetostrictive materials have been used for linear actuators due to its large strain, large force output with moderate frequency band in the presence of magnetic field. However their performance analysis is difficult because of nonlinear material behaviors in terms of coupled strain-magnetic field dependence, nonlinear permeability, pre-stress dependence and hysteresis. This paper presents a finite element analysis technique for magnetostrictive linear actuator. To deal with coupled problems and nonlinear behaviors, a simple finite element approach is proposed, which is based on separate magnetic field calculation and displacement simulation. The finite element formulation and an in-house program development are illustrated, and a simulation model is made for a magnetostrictive linear actuator. The fabrication and performance test of the linear actuator are explained, and the performance comparison with simulation result is shown. Since this approach is simple, it can be applied for analyzing magnetostrictive underwater projectors and ultrasonic transducers.
Speech Intelligibility Analysis on the Vibration Sound of the Glass Window of a Conference Room
Kim, Hee-Dong ; Kim, Yoon-Ho ; Kim, Seock-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 4, 2007, Pages 363~369
DOI : 10.5050/KSNVN.2007.17.4.363
The purpose of the study is to obtain acoustical information to prevent eavesdropping of the glass window. Speech intelligibility was investigated on the vibration sound detected from the glass window of a conference room. Objective test using speech transmission index(STI) was performed to estimate quantitatively the speech intelligibility. STI was determined based on tile modulation transfer function(MTF) of the room-glass window system. Using Maximum Length Sequency(MLS) signal as a sound source, impulse responses of the glass window and MTF were determined by signals from accelerometers and laser doppler vibrometer. Finally, speech intelligibility of the interior sound and window vibration were compared under different sound pressure levels and amplifier gains to confirm the effect of measurement condition on the speech intelligibility.