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 14, Issue 12 - Dec 2004
Volume 14, Issue 11 - Nov 2004
Volume 14, Issue 10 - Oct 2004
Volume 14, Issue 8 - Aug 2004
Volume 14, Issue 7 - Jul 2004
Volume 14, Issue 6 - Jun 2004
Volume 14, Issue 5 - May 2004
Volume 14, Issue 4 - Apr 2004
Volume 14, Issue 9 - Mar 2004
Volume 14, Issue 3 - Mar 2004
Volume 14, Issue 2 - Feb 2004
Volume 14, Issue 1 - Jan 2004
Selecting the target year
Power Consumption and Sensitivity ratio of VCM-type Actuator for Disk Drive
Kim, Sun-Mo ; Jang, Dong-Seob ; Yoon, Jinwook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1207~1222
DOI : 10.5050/KSNVN.2004.14.12.1207
In this paper, the explicit equations on the power consumption and sensitivity ratio of VCM-type actuator for disk drive are proposed. The power consumption and sensitivity ratio is derived in frequency domain. The power consumption during the track following of the actuator can be described well in frequency domain and it can be used to calculate the total power dissipation of the actuator which is needed to compensate the tracking and focusing errors. Also, the sensitivity ratio of an actuator is derived by using the reference servo of a disk drive and will be used to optimally obtain the performances of the actuator. This sensitivity ratio can persuasively explain the basis of the target performances of the actuator in the considerations of the reference servo. The usefulness of the proposed equations for the sensitivity ratio and power consumption of an actuator is shown by a lot of simulations. In the near future, we will verify the simulation results by experiments.
Experimental Study on Subjective Sound Quality Evaluation of Vehicle Noises
Choe, Byongho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1223~1232
DOI : 10.5050/KSNVN.2004.14.12.1223
This study is directed toward determining the number and characteristics of psychologically meaningful perceptual dimensions required for assessing the sound quality with respect to vehicle noises, and toward identifying the acoustical and/or psychoacoustical bases underlying the preference and similarity judgments. For the purpose of analyzing the paired comparison data produced by subjective ratings we used nonmetric multidimensional scaling(MDS). The perceptual dimensions based upon preference ratings could explain 76.3 % of the variance by maximum dB(A) and sharpness acum. The correlation between objective and subjective positions of the stimuli is
Fault Diagnosis of Rotating Machinery Using Multi-class Support Vector Machines
Hwang, Won-Woo ; Yang, Bo-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1233~1240
DOI : 10.5050/KSNVN.2004.14.12.1233
Condition monitoring and fault diagnosis of machines are gaining importance in the industry because of the need to increase reliability and to decrease possible loss of production due to machine breakdown. By comparing the nitration signals of a machine running in normal and faulty conditions, detection of faults like mass unbalance, shaft misalignment and bearing defects is possible. This paper presents a novel approach for applying the fault diagnosis of rotating machinery. To detect multiple faults in rotating machinery, a feature selection method and support vector machine (SVM) based multi-class classifier are constructed and used in the faults diagnosis. The results in experiments prove that fault types can be diagnosed by the above method.
Experiments for the Acoustic Source Localization in 2D Cavity Flow
Lee, Jaehyung ; Park, Kyu-Chol ; Choi, Jong-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1241~1248
DOI : 10.5050/KSNVN.2004.14.12.1241
This paper presents an acoustic source localization technique on 2D cavity model in flow using a phased microphone array. Investigation was performed on cavity flows of open and closed types. The source distributions on 2D cavity flow were investigated in an anechoic open-jet wind tunnel. The array of microphones was placed outside the flow to measure the far field acoustic signals. The optimum sensor placement was decided by varying the relative location of the microphones to improve the spatial resolution. Pressure transducers were flush-mounted on the cavity surface to measure the near-filed pressures. It is shown that the propagated far field acoustic pressures are closely correlated to the near-field pressures and their spectral contents are affected by the cavity parameter L/D.
Vehicle Noise Status and Characteristics
Lee, J.W. ; Park, J.C. ; Kang, Daejoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1249~1254
DOI : 10.5050/KSNVN.2004.14.12.1249
The road traffic noise becomes aggravated due to the rapid increase of motor vehicles. It has a great effect ell the dwelling environment. We Investigated characteristics and sources of the motor vehicle noise through grasping the status of the motor vehicle noise. Traffic noise results from the collective contribution of the noise produced by individual motor vehicles. The motor vehicle noise varies enormously depending upon its type and mode of operation. This Paper is concerned with the relationship between the vehicle running speed and the noise level under accelerated and steady running.
Improvement of Assembling Efficiency for Moving Magnet Type Actuator in High Density Optical Disc
Jeong, Ho-Seop ; Yoon, Yong-Han ; Kim, Do-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1255~1260
DOI : 10.5050/KSNVN.2004.14.12.1255
A moving-magnet type pickup actuator has an assembly error. That is, the actuating Part of an actuator is shifted from initial position after we assemble it into yoke. This Is the result of an effect of magnetic force between magnet and yoke. We performed magnetic-analysis using FEA. As a result of simulation, we improved the assembling efficiency for moving-magnet type actuator.
Shock Response Analysis of the Optical Disk Drive in Consideration of Disk and Pick up
Shin, Eun-Jung ; Chang, Young-Bae ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1261~1267
DOI : 10.5050/KSNVN.2004.14.12.1261
As the optical disk drives are designed for portable and hostile environment, they have a possibility to miss the track and not to read the data. The shock response of optical disk drives must be analyzed. This research shows the shock response analysis of the optical disk drive. The optical disk drive is modeled as the lumped parameter system in consideration of the pickup and the disk. The lumped parameter model is compared with finite element model in order to verify results. Finally, shock responses are compared with the change of the shock magnitude and the duration.
Comparison of Human Responses to Transportation Noise in Monaural and Binaural Hearing, Part I: Measurement and Analysis
Kim, Jaehwan ; Lim, Chang-Woo ; Jeong, Wontae ; Hong, Jiyoung ; Cheung, Wansup ; Lee, Soogab ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1268~1278
DOI : 10.5050/KSNVN.2004.14.12.1268
Measurement of noise is not only to know the information of acoustic pressure but to assess human response to noise. To find human response to transportation noise through the laboratory study we have to measure and reproduce noise. The method of noise reproduction is largely divided into monaural and binaural techniques. But human fundamentally hears sound through both ears, referred as binaural hearing. Binaural signal is different from monaural signal because it includes more information of physical phenomena like acoustical reflection, diffraction and refraction. Especially head and pinna play an important role in perceiving change of signal origin. So, the amplitude of binaural signal is higher than that of monaural signal and spectrum of both signals is discriminated. Most of assessment and regulation of transportation noise are, however, based on monaural measurement techniques. The quantitative difference between monaural and binaural measurement is investigated in this study. Comparison on several transportation noisesshows defect of information in monaural measurements.
Comparison of Human Responses to Transportation Noise in Monaural and Binaural Hearing, Part II: Annoyance
Kim, Jaehwan ; Lim, Chang-Woo ; Hong, Jiyoung ; Jeong, Wontae ; Cheung, Wansup ; Lee, Soogab ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1279~1286
DOI : 10.5050/KSNVN.2004.14.12.1279
This paper continues companion paper, part I : measurement and analysis. As shown in companion Paper, information and energy in monaural signal is quite different from that of binaural signal. In this paper, difference between monaural and binaural signal of transportation noise are investigated in subjective response test. We executed hearing screening test before giving a subject response test and excluded subjects who had physical hearing loss. An annoyance response test was conducted using headphone to avoid cross-talk effect in binaural testing. Percentage of highly annoyed under binaural signal reproduction is higher than percentage of highly annoyed under monaural signal reproduction. Result implies binaural reproduction technique is proper for a study of human response to short-term noise exposure in a headphone simulated-environment.
Faults Detection Method Unrelated to Signal to Noise Ratio in a Hub Bearing
Choi, Young-Chul ; Kim, Yang-Hann ; Ko, Eul-seok ; Park, Choon-Su ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1287~1294
DOI : 10.5050/KSNVN.2004.14.12.1287
Hub bearings not only sustain the body of a cat, but permit wheels to rotate freely. Excessive radial or axial load and many other reasons can cause defects to be created and grown in each component. Therefore, nitration and noise from unwanted defects in outer-race, inner-race or ball elements of a Hub bearing are what we want to detect as early as possible. How early we can detect the faults has to do with how the detection algorithm finds the fault information from measured signal. Fortunately, the bearing signal has Periodic impulse train. This information allows us to find the faults regardless how much noise contaminates the signal. This paper shows the basic signal processing idea and experimental results that demonstrate how good the method is.
A Study on Dynamic Behavior of Cantilever Pipe Conveying Fluid with Crack and Moving Mass (I) - Focused on the Amplitude Characteristics -
Son, In-Soo ; Yoon, Han-Ik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1295~1303
DOI : 10.5050/KSNVN.2004.14.12.1295
In this Paper a dynamic behavior of a cracked cantilever pipe conveying fluid with the moving mass is presented. It has the results focused on the response characteristics. Based on the Euler-Bernouli beam theory, the equation of motion can be constructed by using the Lagrange`s equation. The cracked section is represented by a local flexibility matrix connecting two undamaged beam segments. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. When the fluid velocity is constant, the influences of the crack severity, the position of the crack, the moving mass and its velocity, and the coupling of these factors on the tip-displacement of the cantilever pipe are depicted.
A Study on Dynamic Behavior of Cantilever Pipe Conveying Fluid with Crack and Moving mass (II)-Focused on the Frequency Change-
Son, In-Soo ; Yoon, Han-Ik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1304~1313
DOI : 10.5050/KSNVN.2004.14.12.1304
In this paper a dynamic behavior of a cracked cantilever pipe conveying fluid with the moving mass is presented. It has the results focused on the frequency change. Based on the Euler-Bernouli beam theory, the equation of motion can be constructed by using the Lagrange`s equation. The crack section is represented by a local flexibility matrix connecting two undamaged beam segments. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. When the velocity of the moving mass is constant, the influences of the crack severity, the position of the crack, the moving mass, and the coupling of these factors on the frequencies of the cantilever pipe are depicted.
Nonlinear Vibration Phenomenon for the Slender Rectangular Cantilever Beam
Park, Chul-Hui ; Cho, Chong-Du ; Piao, Chang-Hao ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1314~1321
DOI : 10.5050/KSNVN.2004.14.12.1314
The non-linear responses of a slender rectangular cantilever beam subjected to lateral harmonic base-excitation are investigated by the 2-channel FFT analyzer. Both linear and nonlinear behaviors of the cantilever beam are compared with each other. Bending mode, torsional mode, and transverse mode are coupled in such a way that the energy transfer between them are observed. Especially, superharmonic, subharmonic, and chaotic motions which result from the unstable inertia terms in the transverse mode are analyzed by the FFT analyzer The aim is to give the explanations of the route to chaos, i.e., harmonic motion \longrightarrow superharmonic motion \longrightarrow subharmonic motion \longrightarrow chaos.
The Study on the Optimal Working Condition for Vibration, Surface Roughness and Cutting Temperature in End-milling
Hong, Do-Kwan ; Kim, Dong-Young ; Ahn, Chan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1322~1329
DOI : 10.5050/KSNVN.2004.14.12.1322
End-milling has been used widely in industrial system because it is effective to a material manufacturing with various shapes. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in precision machine part and electronic part. The optimum mechanical vibration of main spindle, surface roughness and cutting temperature have an effect on end-milling condition such as, cutting direction, revolution of spindle, feed rate and depth of cut, etc. Therefore, this study carried to decide the working condition for optimum mechanical vibration of main spindle, surface roughness and cutting temperature using design of experiments, ANOVA and characteristic function. From the results of experimentation, mechanical vibration has an effect on revolution of spindle, radial depth of cut, and axial depth of cut. The surface roughness has an effect on cutting direction, revolution of spindle and depth of cut. And then the optimum condition used design of experiments is upward cutting In cutting direction, 600 rpm in revolution of spindle, 240 mm/min in feed rate, 2 mm in axial depth of cut and 0.25 mm in radial depth of cut. By design of experiments and characteristic function, it is effectively represented shape characteristics of mechanical vibration, surface roughness and cutting temperature in end-milling.
Optimal Control and Robust Control of Rotating Shaft Using Magnetic Bearings
Kang, Ho-Shik ; Jeong, Namheul ; Yoon, Il-Soung ; Song, Ohseop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1330~1337
DOI : 10.5050/KSNVN.2004.14.12.1330
In this study, the equations of motion of a rigid rotor supported by magnetic bearings are derived via Hamilton`s principle, and transformed to a state-space form for control purpose. The optimal motion control of rotor magnetic bearing system based on the LQR(linear quadratic regulator) theory is addressed. New schemes related to the selection of the state weighting matrix Q and the control weighting matrix R involved in the quadratic functional to be minimized are proposed. And the robust control of the system with an LMI(linear matrix inequality) based H
theory is dealt with in this paper. Loop shapings of TFM (transfer function matrix) are used to increase the performance of control capability of the system. The control abilities of LQR and H
controller are compared by simulation and experimental tests and show that the capability of H
controller is superior to that of LQR.
Localization of Rotating Sound Sources Using Beamforming Method
Lee Jaehyung ; Hong Suk-Ho ; Choi Jong-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1338~1346
DOI : 10.5050/KSNVN.2004.14.12.1338
The positions of rotating sound sources have been localized by experiments with the Doppler effects removed. In order to de-Dopplerize the sound signals emitted from moving sources, two kinds of signal reconstruction methods were applied. One is the forward propagation method and the other is the backward propagation method. Forward propagation method analyze the source emission time based on the instantaneous distance between sensors and the assumed source position, then the signals are reconstructed with respect to the emission time. On the other hand, the backward method uses time delay to do-Dopplerize the acquired data for the received time of reference. In both techniques. the reconstructed signal data were processed using beamforming algorithm to produce power distributions at the frequencies of interest. Experiments have been carried out for varying frequencies, rotating speeds and the object distances. It is shown that the forward propagation method gives better performance in locating source position than the backward propagation method.
Probabllistic and Shock Analysis of Head-gimbal Assembly in Micro MO Drives
Oh Woo-Seok ; Park No-Cheol ; Yang Hyun-Seok ; Park Young-Pil ; Hong Eo-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1347~1353
DOI : 10.5050/KSNVN.2004.14.12.1347
With respect to the researches of the optical flying head(OFH) , the head-gimbal assembly should be analyzed to guarantee the stable fabrication and the characteristics of shock resistance. The suitable design is proved through the Probabilistic analysis of the design parameters and material properties of the model. Probabilistic analysis is a technique that be used to assess the effect of uncertain input parameters and assumptions on your analysis model. Using a probabilistic analysis you can find out how much the results of a finite elements analysis are affected by uncertainties in the model. Another factor is analysis of the dynamic shock analysis. For the mobile application, one of the important requirements is durability under severe environmental condition, especially, resistance to mechanical shock. An important challenge in the disk recording is to improve disk drive robustness in shock environments. If the system comes in contact with outer shock disturbance. the system gets critical damage in head-gimbal assembly or disk. This paper describes probabilistic and dynamic shock analysis of head-gimbal assembly in micro MO drives using OFH slider.
Dynamic Analysis of Floating Flexible Body Using Perturbation Method
Seong, Kwan-Jae ; Kwak, Moon K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 14, issue 12, 2004, Pages 1354~1359
DOI : 10.5050/KSNVN.2004.14.12.1354
This paper is concerned with the application of perturbation method to the dynamic analysis of floating flexible body. In dealing with the dynamics of free-floating body, the rigid-body motions and elastic vibrations are analyzed separately. However, the rigid-body motions cause vibrations and elastic vibrations also affect rigid-body motions in turn, which indicates that the rigid-body motions and elastic vibrations are coupled in nature. The resulting equations of motion are hybrid and nonlinear. We can discretize the equations of motion by means of admissible functions but still we have to cope with nonlinear equations. In the previous paper, we proposed the use of perturbation method to the coupled equations of motion and derived zero-order and first-order equations of motion. The derivation process was lengthy and tedious. Hence, in this paper, we propose a new approach to the same problem by applying the perturbation method to the Lagrange`s equations, thus providing a systematic approach to the addressed problem. Theoretical derivations show the efficacy of the proposed method.