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 16, Issue 12 - Dec 2006
Volume 16, Issue 11 - Nov 2006
Volume 16, Issue 10 - Oct 2006
Volume 16, Issue 9 - Sep 2006
Volume 16, Issue 8 - Aug 2006
Volume 16, Issue 7 - Jul 2006
Volume 16, Issue 6 - Jun 2006
Volume 16, Issue 5 - May 2006
Volume 16, Issue 4 - Apr 2006
Volume 16, Issue 3 - Mar 2006
Volume 16, Issue 2 - Feb 2006
Volume 16, Issue 1 - Jan 2006
Selecting the target year
Bearing Vibration and Fatigue Life Analysis According to Fitting between Ball Bearing and Housing with Geometrical Errors
Lee, Young-Keun ; Lee, Seok-Hoon ; Jung, Il-Kwon ; Cha, Cheol-Hwan ; Han, Hyo-Seup ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 441~451
DOI : 10.5050/KSNVN.2006.16.5.441
It is known that ball bearings mounted in housing or on shaft are playing a key role to keep it running smoothly. The roundness of a housing bore on which bearing outer ring is mounted with interference has directly affected the running accuracy of bearing. The running accuracy of bearing, therefore, can extend the significant influence to the rotating machinery as well. In this paper, bearing`s vibration and fatigue life considering raceway roundness of ball bearing before and after mounted in housing bore are theoretically estimated. To perform analysis, a simple three degrees of freedom model was proposed and then Newton-Raphson iterative method was introduced to be utilized in the analysis. The results show that the vibration magnitude of ball bearing fitted into housing unit is appeared considerably larger than the one of its pre-assembling. And theoretical
life which ninety percent of the bearing population will endure decreased in about fifty percent.
A Study on the Equivalent Dynamic Stiffness of Bearing-pedestal
Kim, Hee-Soo ; Bae, Yong-Chae ; Lee, Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 452~456
DOI : 10.5050/KSNVN.2006.16.5.452
The critical speeds and mode shapes are most important to determine the behaviors of rotor in designing rotating machinery. As the capacity and span of turbine-generator increases, the turbine-generator system is composed of many components such as bearings, pedestal, turbine and hood and so on. Also, it is getting flexible and has many critical speeds. Especially, as the characteristics of bearing-pedestal are very complicated, they affect the entire vibration characteristics of turbine-generator system. In this paper, it is observed how to determine the equivalent dynamic stiffness of bearing-pedestal by analytical and experimental method.
New Development of Two-dimensional Sound Quality Index for Brand Sound in Passenger Cars
Jo, Byoung-Ok ; Park, Dong-Chul ; Lee, Min-Sub ; Jung, Seung-Gyoon ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 457~469
DOI : 10.5050/KSNVN.2006.16.5.457
In automotive engineering, the brand sound is one of the important advantage strategies in a car company. For the design of brand sound, the selection of descriptive word for a car sound is one of major works in automotive sound quality research. In this paper, booming and rumbling sound, which are professional words used by sound and vibration engineers are used for the design of brand sound. We employed sound quality metrics, which are used in the psychoacoustics. By most research results, the relationship between subjective evaluations and sound quality metrics has nonlinear characteristics. In order to correlate these subjective evaluations with sound quality metrics, the artificial neural network technology has been applied to two-dimensional sound quality index for a passenger car. These indexes are used for 46 passenger cars, which are samples of the famous cars around the world. Also a preference evaluation for car sound was carried out by sound and vibration engineers. We coupled this preference with booming and rumbling sounds by using artificial neural network. In future, the two dimensional sound and preference index will be very useful to develop brand sound in passenger cars.
Eigenderivative Analysis by Modification of Design Parameter in the Proportional Damping System
Lee, Jung-Woo ; Oh, Jae-Eung ; Lee, Jung-Youn ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 470~478
DOI : 10.5050/KSNVN.2006.16.5.470
An efficient method for change of eigenvectors and eigenvalues due to the modifying proportional damping structure using sensitivity coefficients is presented. Sensitivity coefficients are determined by iteration with eigenvalue and eigenvectors before modification of system. The proposed method is applied to examples of 3 degrees of freedom system and plate by modifying mass and stiffness. The predicted change of eigenvectors and eigenvalues are in a good agreement with these from the structural re-analysis after modification of mass and stiffness.
Dual Servo Control for Aperture Type Near Field Storage Head
Lee, Sung-Q ; Kim, Eun-Kyoung ; Park, Kang-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 479~484
DOI : 10.5050/KSNVN.2006.16.5.479
This paper presents an active control of the aperture type near-field storage head. In order to achieve a fast and accurate control, a dual servo control algorithm is applied. Based on the big difference in time constants of two actuators, they are used independently. With the combination fine and coarse actuator, the disk is rotated up to 10 rpm speed until the gap is controlled within 100 nm. From the experimental results, the feasibility and the performance of active dual servo gap control is proved.
Design Optimization by the Correlation between the Design Parameter and the Sound Quality of Small Turbo-fan
Kim, Hooi-Joong ; Jung, Young-Gyu ; Lee, Jung-Soo ; Lee, Seung-Bae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 485~494
DOI : 10.5050/KSNVN.2006.16.5.485
The state-of-the-art of low-noise fan design usually includes the consideration of optimal sound level and sound quality. The influential design parameters of the noise level by the centrifugal fan were selected based on the preliminary test. The centrifugal fans were designed according to the experiment plan method by specifying the selected design parameters. The experiment with these machined mock-up`s of centrifugal impellers suggested the major design parameters among many, having impacts upon the indices of sound quality (e.g. loudness, sharpness, roughness and fluctuation strength) at the same operation point. With the response surface method, the major design parameters selected thereafter were analyzed to estimate each contribution upon the sound quality of the centrifugal fan, and the optimal values were drawn by the consideration of the sound quality levels and their regression equations. In addition, the validity of the regression equations was numerically verified by means of the coefficient of determination. Furthermore, the mechanism by which the centrifugal fan impeller influences the determinants of its sound quality was suggested.
Bearing Fault Diagnosis Using Automaton through Quantization of Vibration Signals
Kim, Do-Hyun ; Choi, Yeon-Sun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 495~502
DOI : 10.5050/KSNVN.2006.16.5.495
A fault diagnosis method is developed in this study using automaton through quantization of vibration signals for normal and faulty conditions, respectively. Automaton is a kind of qualitative model which describes the system behaviour at the level of abstraction. The system behavior was extracted from the probability of the output sequence of vibration signals. The sequence was made as vibration levels by reconstructing the originally measured vibration signals. As an example, a fault diagnosis for the bearing of ATM machine was done, which detected the bearing fault with confident level compared to any other existing methods of kurtosis or spectrum analysis.
A Study on the Evaluation Metric of a Civil Aircraft Noise
Lee, Jun-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 503~513
DOI : 10.5050/KSNVN.2006.16.5.503
The duration time of aircraft noise event is also an important factor for the evaluation of civil aircraft noise, which is considered as a notable characteristic of military aircraft noise. SEL is proved as a suitable noise metric for the measuring military aircraft noise of various flight pattern considering the duration time of noise event. This study reviews whether SEL is a suitable for measuring civil aircraft noise and study shows SEL is fairly compensating the duration time of civil aircraft noise event for the evaluation of aircraft noise. Noise metric for the evaluation aircraft noise based on SEL is more appropriate than based on
for compensating duration time of noise event either military aircraft or civil aircraft. In this reason, current formula of WECPNL based on energy average of measured
for the evaluation of aircraft noise impact in `Test Method of Noise and Vibration of Korea` is recommended to be amended to formula of WECPNL based on energy average of measured SEL considering compensation of noise event duration time, if WECPNL is not based on measured EPNL, a metric compensating duration time.
Vibration Evaluation and Accuracy Improvement for a Digital Pile Rebounding and Penetration Monitoring System (DPRMS)
Hong, Jung-Taek ; Lee, Kye-Young ; Lee, Sang-Hun ; Han, Song-Soo ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 514~520
DOI : 10.5050/KSNVN.2006.16.5.514
In this study, the performance of a digital pile rebounding and penetration monitoring system (DPRMS) is evaluated and the measurement precision of the DPRMS is improved. The DPRMS is a high speed line-scanning camera system to measure the rebound and penetration of a pile in a construction work. A main problem in the DPRMS is a measurement error, which is caused by a shock or vibration due to a hammer impact. The measurement error is investigated by analyzing vibration signals of the DPRMS during the impact. Moreover, the frequency response functions of the DPRMS are also analyzed. As a result, it is found that the tripod height has an influence on the DPRMS performance and a shorter tripod is better. One more founding in this study is that the DPRMS should be placed with a appropriate distance from a pile for improving the measurement precision.
Verification on Damage Calculating Method of Vibration Fatigue Using Uni-axial Vibration Test
Kim, Chan-Jung ; Bae, Chul-Yong ; Lee, Bong-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 521~528
DOI : 10.5050/KSNVN.2006.16.5.521
The vibration fatigue is suitable case of fatigue problem that system is exposed to the random or other irregular sources. Even some kinds of effort using power spectral density (PSD) and statistical concept was presented to cope with the intangible force signal, it is still lack of providing a reasonable solution when its exciting frequency is near or beyond of first eigenvalue. In this paper, energy approach method is presented to calculate a vibration induced fatigue damage in frequency domain. Since the corresponding damage become much larger than nominal case when the vibration is coupled with a mode shape of given structure, the new technique compensate the characteristics of structure with a measured frequency response function (FRF) between forcing acceleration and responding stress.
Vibration Reduction of an Optical Disk Drive with a Dynamic Vibration Absorber
Kim, Nam-Woong ; Sin, Hyo-Chol ; Kim, Kug-Weon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 529~536
DOI : 10.5050/KSNVN.2006.16.5.529
In high-speed optical disk drive, the excitation caused by rotation of a mass-unbalanced disk is a major source of vibration. The vibration can be a disturbance to the servo system, which is sufficient to cause severe failures in the reading and writing process. The vibration also causes users to feel unpleasantness. The vibration reduction is therefore essential for the reliable operation of optical disk drive. One of the approaches to reduce the vibration is a dynamic vibration absorber(DVA). In this paper, we analyze the dynamic behavior of
combo drive system with DVA through 12-dof rigid multi-body dynamic model. The effective location and the optimal frequency ratio for the DVA are obtained from the analysis. The DVA are fabricated based on the analysis and its usefulness is confirmed.
The Study of Sound Quality Metrics for the Golf Club`s Impact Sound
Kim, Kwan-Ju ; Park, Jin-Kyu ; Park, Hee-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 537~543
DOI : 10.5050/KSNVN.2006.16.5.537
The impact sound of the golf club is one of the major factors to purchase it. Sound quality metrics has been mostly developed for harmonic sounds. Sound quality evaluation techniques for the impact sound have been contrived in this study. Jury test, one of the typical subjective evaluation scheme, is carried out for evaluating the sound quality of 13 different golf drivers, which classification results are assumed to be correct answers. Conventional objective evaluation methods such as Zwicker loudness sensory pleasantness are calculated. Wavelet analysis and instantaneous loudness are applied in order to evaluate the sound quality of transient sounds, which scheme shows better correlation with the results from jury test.
An Experimental Study on the Recognition Region of Passive Soundscape Facilities Especially in Fountains
Song, Min-Jeong ; Jang, Gil-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 544~550
DOI : 10.5050/KSNVN.2006.16.5.544
The interaction between people and sound and the way how people consciously perceive their environment are central approach to soundscape research. In this respect, this paper aims to clarify the relationship between water-sound level and recognition region in urban area. As a passive soundscape facility, fountain is a useful way to give place such as public square, park identity and vitality. In this study, to know the optimistic distance and sound level range from fountain, sound levels due to distance were measured and subject responses were checked by questionnaire. As a result, levels from 63 dB to 67 dB were recommended by subjects and moving forward to fountain less satisfactory than backward. Moving forward 5 m and backward 5 m(total range 10 m): there was a difference in satisfaction ratio by 2,5 out of 10. The results of this study could be used for street furniture location design and P.A. system output level.
Evaluation of Sound Quality of Air-conditioning Noise
Jeon, Jin-Yong ; You, Jin ; Kim, Su-Yeon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 16, issue 5, 2006, Pages 551~558
DOI : 10.5050/KSNVN.2006.16.5.551
Noise from air-conditioner system installed in the ceiling of a classroom was evaluated to investigate the sound quality of air-conditioning noise. Harmonics of air-conditioning noise were removed and the sound pressure levels of the frequency bands from
were changed to control sound quality. Evaluation for refreshing sensation was conducted using a paired comparison method and the results showed that noise without harmonics were preferred to noise with harmonics. The noises which have larger level increases to the unchanged noise at
were evaluated better in both of the noises with and without harmonics. Results of multiple regression analysis on psychoacoustic parameters and subjective preferences showed sharpness as a major affecting factor in describing the refreshing aspect of air-conditioning sound.