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 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
Sound Absorption Characteristics of Building Interior Decoration Materials
Kang, Dae-Joon ; Lee, J.W. ; Gu, J.H. ; Park, H.K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 201~206
DOI : 10.5050/KSNVN.2007.17.3.201
It is important to consider the sound absorption characteristics of building interior decoration materials when we design a building and simulate acoustics in a room. The purpose of this study is to accumulate acoustic data on building interior decoration materials and give a basic data for improving the sound absorption performance by testing the sound absorption coefficients of 9 types of ceiling materials, 14 types of wall papers and 20 types of floor papers.
Noise Reducers Effect on Road Traffic Noise
Hong, Yun-H. ; Kim, Jeung-T. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 207~212
DOI : 10.5050/KSNVN.2007.17.3.207
Community noise has been great concerned in public. The traffic noise in seoul, especially has been growing awareness for the quiet living environment. In this paper, the effect on the noise barrier in order to reduce highway noise near on the street has been examined. First barriers have been evaluated at 5 locations in the city. The evaluation is performed before and after construction, with the reference point which does not affected on road traffic volume. Then, noise reducers mounted on the harriers also have been examined. the result shows that it reduces noise level by
with a standard deviation of 2.8 dB(A).
ADINA/FSI Analysis of Petrochemical Plant Column Mixer
Lee, Won-Suk ; Jung, Goo-Choong ; Choi, Yeon-Sun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 213~219
DOI : 10.5050/KSNVN.2007.17.3.213
Column mixer Is one of the facilities to mix fluids at petrochemical plants. The vibration of column mixer is usually caused by pumps for fluid inflow and mixing of inside fluids. This fluid induced nitration is mainly responsible for the reduction of column life. Measurements were performed for understanding the vibration characteristics of the column. First measurement results showed the need of stiffness reinforcement. After the reinforcement work, second measurement confirmed the difference between two results. Modal analysis was also performed to investigate the resonance of the column vibration and the damage of the rib plate. To confirm fluid induced vibration at the column mixer fluid structure interaction analysis using ADINA/FSI was performed, which showed the necessity of the modification of the rotary valve.
Free Vibration Analysis of Arbitrarily Shaped Polygonal Plates with Free Edges by Considering the Phenomenon of Stress Concentration at Corners
Kang, Sang-Wook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 220~225
DOI : 10.5050/KSNVN.2007.17.3.220
Free vibration analysis using the method of NDIF (non-dimensional dynamic influence function), which was developed by the author, is extended to arbitrarily shaped polygonal plates with free edges. Local Cartesian coordinate systems are employed to apply the free boundary condition to nodes distributed along the edges of the plate of interest. Furthermore, a new way for applying the free boundary condition to nodes located at corners of the plate is for the first time introduced by considering the phenomenon of stress concentration at the corners. Two case studies show that the proposed method is valid and accurate when the eigenvalues by the proposed method are compared to those by FEM(ANSYS).
An Experimental Study on the Noise Characteristics of Water Supply and Drain Installations Varied with Water Suppling Pressure in Apartment Bathroom
Lee, Tai-Gang ; Ko, Kwang-Pil ; Choi, Eun-Suk ; Kim, Hang ; Kim, Sun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 226~234
DOI : 10.5050/KSNVN.2007.17.3.226
This study aims to evaluate noise emission from water supply and drain installations in apartment bathroom. These noise were one of the most annoying noise sources in apartment houses. Especially, drain plumbing system have used bellow bathroom ceiling, it was very discomfort to hear the noise in bellow apartment. Noise of closets and faucets were measured which were main noise source, then these noise were evaluate and analyzed the emitting characteristics varying the supplying water pressure. As increasing the water pressure, also total noise level of the water supplying stool noise and faucet noise were increased. Especially the water closet showed remarkably the increasing noise level in middle and high frequency bandwidth, while the noise level of faucets increased in
of low frequency bandwidth. Vortex closet were favorable to syphon closet, and lever faucet were favorable to conventional lavatory faucet on reducing the noise. Above these results could be used in basic data establishing KS (Korean Standard) for evaluation and rating procedure and measures reducing these noise.
Vibration Measurement of an Automobile Exhaust System in Operation
Kim, Sung-Kook ; Lee, Jong-Nam ; Han, Soon-Woo ; Chung, Tae-Jin ; Lee, Sin-Young ; Jang, Gang-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 235~240
DOI : 10.5050/KSNVN.2007.17.3.235
In this work, the operational deflection shape(ODS) of an automobile exhaust system is measured by using a recently-developed magnetic sensor. The magnetic sensor is composed of a solenoid and two pairs of permanent magnets generating an antisymmetric magnetic field in the lateral direction inside the solenoid. Lateral movement of a ferromagnetic pipe inside the magnetic field of the suggested sensor induces an electromotive force in the solenoid corresponding to the lateral velocity of the pipe. Due to the simplicity and non-contact characteristics of the magnetic sensor, dynamic behaviors of the structures operating under high temperature such as an exhaust pipe can be efficiently observed. It is shown that the lateral ODS of an exhaust system can be successfully measured by the suggested sensors.
Study on the Subjective Responses of Loudness and Annoyance according to Exposed Time for the Traffic Noise
Hur, Deog-Jae ; Jo, Kyoung-Sook ; Choe, Byong-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 241~248
DOI : 10.5050/KSNVN.2007.17.3.241
A study has been conducted to investigate the subjective responses of loudness and annoyance according to the exposed time of urban traffic noise in controlled laboratory environment. To make a closer inspection into psychological response relevant to noise characteristics while varying the time of exposure to noise, the subjects were presented a set of noises with different exposed time and requested to judge spontaneously on a 100-unipolar scale. To be concrete, the subjects were exposed to noises being varied in time from 15 sec up to max. 1,200 sec for the controlled traffic noise sources. So far achieved from laborious tests, it has an importance being on the logarithmic relations of perceived loudness and exposed time, say, it is more increased the perceived loudness in the sorter exposed time than in the longer exposed time. However, the trend is said to be not effective for the case of annoyance. On the other hand, the subjective impressions on relative annoyance of noise is shown to be correlated with the noise characteristics such as loudness (sones), tonality and time with logarithmic scale, the product correlation moment being calculated as
. The variances to be explained for annoyance assessments through varying the time of exposure were ranged between 30 % and 50% for the exposed time,
for tonality, and
for loudness, respectively With these results, hopefully, it can be helpful for those who want to work out an experimental design for evaluating an environmental noise or to quantify any psychological dimensions found in annoyance assessments.
A Study on the Reduction of Simulation Errors in the Prediction of Military Aircraft Noise
Kim, Mi-Jin ; Lee, Byung-Chan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 249~256
DOI : 10.5050/KSNVN.2007.17.3.249
Aircraft noise is a serious problem to inhabitants near airports. INM is one of programs for determining the predicted noise impact in the vicinity of airports. It has been widely used for engineers to evaluate aircraft noise. However it is difficult to predict aircraft noise in case of lack of exact INM input data. The exact informations about a fighter plane are not known well for a security problem. This study presents methods of reducing errors between measurement and simulation when the exact INM input data is not known. Especially we adjusted the thrust force of aircraft engine and reduced the error.
A Study for The Comparison of Structural Damage Detection Method Using Structural Dynamic Characteristic Parameters
Choi, Byoung-Min ; Woo, Ho-Kil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 257~263
DOI : 10.5050/KSNVN.2007.17.3.257
Detection of structural damage is an inverse problem in structural engineering. There are three main questions in the damage detection: existence, location and extent of the damage. In concept, the natural frequency and mode shapes of any structure must satisfy an eigenvalue problem. But, if a potential damage exists in a structure, an error resulting from the substitution of the refined analytical finite element model and measured modal data into the structural eigenvalue equation will occur, which is called the residual modal forces, and can be used as an indicator of potential damage in a structure. In this study, a useful damage detection method is proposed and compared with other two methods. Two degree-of-freedom system and Cantilever beam are used to demonstrate the approach. And the results of three introduced method are compared.
Response between Collocated Sensor and Actuator Bonded on a Smart Panel
Lee, Young-Sup ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 264~273
DOI : 10.5050/KSNVN.2007.17.3.264
A smart panel with structural sensors and actuators for minimizing noise radiation or transmission is described in the paper with the concept of active structural acoustical control. The sensors and actuators are both quadratically shaped piezoelectric polyvinylidene fluoride(PVDF) Polymer films to implement a volume velocity sensor and uniform force actuator respectively. They are collocated on either side of the panel to take advantage of direct velocity feedback(DVFB) strategy, which can guarantee a robust stability and high performance as long as the sensor-actuator response is strictly positive real(SPR). However, the measured sensor-actuator response of the panel showed unexpected result with non-SPR property. In the paper, the reason of the non-SPR property is investigated by theoretical analysis, computer simulation and experimental verification. The investigation reveals that the arrangement of collocated piezoelectric PVDF sensor and actuator pair on a panel is not relevant to get a high feedback gain and good performance with DVFB strategy.
A Study on Examination of Propriety about L
24 in Road Traffic Noise Environment Standard Evaluation
Kim, Byoung-Sam ; Chi, Chang-Heon ; Choi, Hong-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 3, 2007, Pages 274~281
DOI : 10.5050/KSNVN.2007.17.3.274
Road traffic noise is not produced by any one factor rather it occurs as a composition of various factors. Its occurrence is made by running engine noise, tire frictional, and exhaust noise etc. The quality of the noise depends on the size of the vehicles, rotation and engine speed, vehicle load, package state of the road and incline etc. The occurrence of any noise level of heavy trucks appears louder than smaller vehicles and the noise levels produced differs according to speed and load etc between similar size vehicles. Other factors such as traffic density, average speed, mixing rate of heavy vehicles, and the distance between vehicles also generate road traffic noise. In this paper we examine 2, 4, and 6-lane roads in Jeonju. Consequently, this study examines the means used to measure road traffic noise. It was found that when there is a large traffic density and the average velocity is below 70 km/h, the noise level could receive a relative proper value by the current measuring means. But in the case of night-time, it was found that the current measuring method is inapposite.