Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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
Active Control of Propagated Noise through Opening of Enclosures Surrounding a Noise Source
Lee, Hanwool ; Hong, Chinsuk ; Jeong, Weuibong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 223~231
DOI : 10.5050/KSNVE.2015.25.4.223
Enclosures are widely used to alleviate the contribution of machinery noise. It has been long concerned with the noise transmission through the access openings of the enclosures. In this study, we investigate active noise control technology for reduction of the transmission. A numerical model based on the acoustic boundary element method is first established. Using the numerical model, the acoustic transfer functions of the field points over the opening to the primary source at arbitrary locations are estimated. The feedforward control to minimize the acoustic power through the opening is then numerically implemented. The controller drives the secondary source to destructively interfere the noise transmission through the opening. Finally, a parametric study is conducted to evaluate the effects of the location and the number of the microphones on the control performance. Furthermore, the effects of the location of the secondary source on the performance of active noise control are investigated. It is followed that the control system implemented in this study leads to a significant reduction of about 31.5 dB in the sound power through the opening using only one secondary source located at the optimized position.
Selection of Nodes and Modes for Reduced Modeling of Substructures
Hwang, Woo Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 232~237
DOI : 10.5050/KSNVE.2015.25.4.232
Complex dynamic systems are composed of several subsystems. Each subsystems affect the dynamics of other subsystems since they are connected to each other in the whole system. Theoretically, we can derive the exact mass and stiffness matrix of a system if we have the natural frequencies and mode shapes of that system. In real situation, the modal parameters for the higher modes are not available and the number of degree of freedom concerned are not so high. This paper shows a simple method to derive the mass and stiffness matrix of a system considering the connecting points of subsystems. Since the accuracy of reconstructed structure depends on the selection of node and mode, the rule for selection of node and mode are derived from the numerical examples.
Verification of Micro-vibration Isolation Performance by using Low Rotational Stiffness Isolator under Elevation Direction Operation of the X-band Antenna
Jeon, Su-Hyeon ; Lee, Jae-Gyeong ; Jeong, Sae-Han-Sol ; Lee, Myeong-Jae ; Oh, Hyun-Ung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 238~246
DOI : 10.5050/KSNVE.2015.25.4.238
A stepping motor is widely used to operate the elevation and azimuth stage of the X-band antenna with 2-axis gimbal system for effective image data transmission from a satellite to a ground station. However, such stepping motor also generates an undesirable micro-vibration which is one of the main disturbance sources affecting image quality of the high-resolution observation satellite. In order to improve the image quality, the micro-vibration isolation of the X-band antenna system is essential. In this study, the low rotational stiffness isolator has been proposed to reduce the micro-vibration disturbance induced by elevation direction operation of the X-band antenna. In addition, its structural safety was confirmed by the structure analysis based on the derived torque budget. The effectiveness of the design was also verified through the micro-vibration measurement test.
Run-flat Tire Optimization Using Response Surface Method and Genetic Algorithm
Choi, Jaehyeong ; Kang, Namcheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 247~254
DOI : 10.5050/KSNVE.2015.25.4.247
Ride comfort is one of the major factors in evaluating the performance of the vehicle. Tire is closely related to the ride comfort of the vehicle as the only parts in contact with the road surface directly. Vertical stiffness which is one of the parameters to evaluate the tire performance is great influence on the ride comfort. In general, the lower the vertical stiffness, the ride comfort is improved. Research for improving the ride comfort has been mainly carried out by optimizing the shape of the pneumatic tire. However, demand for safety of the vehicle has been increased recently such as a run-flat tire which is effective in safety improvement. But a run-flat tire have trouble in practical use because of poor ride comfort than general tire. Therefore, In this paper, the research was carried out for improving the ride comfort through the optimization of the SIR shape inside a run-flat tire. Meta-model was generated by using the design of experiment and it was able to reduce the time for the finite element analysis of optimization. In addition, Shape optimization for improving the ride comfort was performed by using the genetic algorithm which is one of the global optimization techniques.
Multiple Noise Analysis of the Inside Equipments in Shelter System
Kim, Sang-Hyun ; Lee, Byung-Ho ; Lee, Sock-Kyu ; Lee, Jeung ; Kang, Dong-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 255~265
DOI : 10.5050/KSNVE.2015.25.4.255
Shelter system is applying to weapon systems as usage of performing specific mission with arranging several electronic equipments and operators. Recently the electronic equipments is changing from development products to COTS(commecial off-the-shelf) for demonstrating high performance at low cost. As internal operators of shelter system conduct several missions for specific or long time in this present situation, one of the most important element considering the best combat power is internal noise level. Therefore, I desire to analyze the features and foresee multiple noise level with test for conforming whether requirements of design is met or not in this research paper.
Evaluation of Human Exposure to Vibration on Domestic High-speed Train using ISO 2631-1
Kim, Ji Man ; Park, Jin Han ; Ahn, Se Jin ; Jeong, Weui Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 266~274
DOI : 10.5050/KSNVE.2015.25.4.266
Vibration exposure of domestic high speed trains(KTX and ITX-saemaeulho) to passenger traveling on the Gyung-Bu line was measured to evaluate health effect which is based on ISO 2631-1. The vibration exposure was compared with the frequency weighted root mean square(r.m.s.) and vibration dose value(VDV) of the two trains’ vibration. It is concluded that vibration exposure of the two train during round trip of Busan-Seoul in single day is evaluated to be safe for the passenger’s health according to the health guidance caution defined on ISO 2631-1. Futhermore KTX’s vibration exposure is found to be significantly lower than ITX-saemaeulho thanks to lower vibration magnitude as well as shorter trip time.
Analysis of Building Facade Noise and Ground Noise in a Roadside Apartment Complex through Noise Mapping
Shin, Hye-Kyung ; Kim, Myung-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 275~283
DOI : 10.5050/KSNVE.2015.25.4.275
The aim of this study is to estimate the noise exposure of roadside apartment complex according to the characteristics of apartment complex. The facade noise level of residential buildings and the ground noise level inside apartment complexes were predicted and analyzed using noise mapping based on a computerized noise model. In addition, the correlation analysis between these noise levels and the characteristics of apartment complex such as traffic volume, building coverage, the number of adjacent roads, etc. was done in a total of 21 apartment complexes. The results showed that building facade noise level and ground noise level were positively correlated with traffic volume (correlation coefficient, r=0.616~0.623) and the number of adjacent roads (r=0.340~0.496). On the other hand, they were negatively correlated with building coverage (r=-0.413~-0.477) and complex area per the number of roads (r=-0.478~-0.615).
Road Traffic Noise Simulation for Small-scale Urban Form Alteration Using Spatial Statistical Model
Ryu, Hunjae ; Chun, Bum Seok ; Park, In Kwon ; Chang, Seo Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 284~290
DOI : 10.5050/KSNVE.2015.25.4.284
Road traffic noise is closely related with urban forms and urban components, such as population, building, traffic and land-use, etc. Hence, it is possible to minimize the noise exposure problem depending on how to plan new town or urban planning alteration. This paper provides ways to apply for urban planning in consideration of noise exposure through road traffic noise estimation for alteration of small-scale urban form. Spatial autoregressive model from the former study is used as statistical model for noise simulation. The simulation results by the spatial statistical model are compared with those by the engineering program-based modeling for 5 scenarios of small-scale urban form alteration. The error from the limitation of containing informations inside the grid cell and the difficulties of reflecting acoustic phenomena exists. Nevertheless, in the stage of preliminary design, the use of the statistical models that have been estimated well could be useful in time and economically.
A Study on the Reverberation Time Characteristics of Inside Space of Apartment Buildings
Jeong, Jeong Ho ; Lee, Byung Kwon ; Jeon, Jin Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 291~298
DOI : 10.5050/KSNVE.2015.25.4.291
In this study, the reverberation time of apartment living room was measured and distribution of the reverberation time was analyzed. In addition, sound field characteristics of mock-up test room similar with living room and timber structured bedroom was investigated with addition of furniture and sound absorption material. Average reverberation time of unfurnished apartment unit was 1.11 s, and reverberation time in 630 Hz~2000 Hz bands were longer than 1.2 s. It was found that from the field measurement results, reverberation time characteristic of furnished apartment living room was uniform in most of frequency bands. Averaged reverberation time of furnished living room was 0.48 s and the reverberation time of bedroom was 0.44 s. Standardized sound pressure level correction values were calculated from the average reverberation time of furnished and unfurnished apartment units. The correction value of unfurnished living room was −3.4 dB and that of furnished living room was 0.2 dB. Measured reverberation time of furnished and unfurnished apartment units indicated that reference reverberation time; 0.5 s, in KS and ISO standards is reasonable also in Korean residential environment.
Classification Accuracy Test of Hearing Laboratory Test Models for Railway Noise at Station Platform
Kim, Phillip ; Ahn, Soyeon ; Jeon, Hyesung ; Lee, Jae Kwan ; Park, Sunghyun ; Chang, Seo Il ; Park, Il Gun ; Jung, Chan Gu ; Kwon, Se Gon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 4, 2015, Pages 299~305
DOI : 10.5050/KSNVE.2015.25.4.299
A statistical annoyance model to railway noise at platform was proposed by jury evaluation test performed in hearing laboratory. ITX-Saemaeul and Mugunghwa were chosen as the noise sources of the test, and announcement sound was included to simulate real situation. Logistic regression analysis produced %HA
curve. Hosmer-Lemeshow test and classification accuracy test were used to verify the model's statistical significance. It was shown that the model which was generated from relatively small number of samples is statistically significant.