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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
Editor in Chief :
Volume & Issues
Volume 22, Issue 12 - Dec 2012
Volume 22, Issue 11 - Nov 2012
Volume 22, Issue 10 - Oct 2012
Volume 22, Issue 9 - Sep 2012
Volume 22, Issue 8 - Aug 2012
Volume 22, Issue 7 - Jul 2012
Volume 22, Issue 6 - Jun 2012
Volume 22, Issue 5 - May 2012
Volume 22, Issue 4 - Apr 2012
Volume 22, Issue 3 - Mar 2012
Volume 22, Issue 2 - Feb 2012
Volume 22, Issue 1 - Jan 2012
Selecting the target year
Regression Analysis of an Excavator Sound Power Level
Gu, Jin-Hoi ; Lee, Jae-Won ; Seo, Chung-Youl ; Jang, Seong-Ki ; Choi, Kyung-Hee ; Han, Jin-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 203~207
DOI : 10.5050/KSNVE.2012.22.3.203
The noise emitted from an excavator has long been a cause of environmental disputes, while causing displeasure to the nearby residents. So, the ministry of environment adopted the construction machinery noise labeling system to encourage the construction machinery manufacturing companies to develop the low noise construction machinery voluntarily. But, as the quality of life improves, a growing number of people desire the comfortable and quite environment to live in. Under the situation, noise from the construction machinery has been a major cause for stress and complaints. When the noise dispute happened in the construction site, the sound pressure level of the construction machinery like a excavator was measured at the lot boundary of the noise victim`s residence to judge how much noise damage occur. But the sound pressure level of the construction machinery is measured differently according to the acoustic environment of construction site and the measuring position, respectively, which makes it difficulty to judge whether the noise damage occur or not. As the sound power level of noise source is not affected by the acoustic environment of construction site and the measuring position, if we use the information of the sound power level, it will be easy to judge whether the noise damage occur and to establish the soundproofing measures. Therefore, we derive the sound power level regression model of the excavator to judge whether the noise emitted from the excavator damages to residents near the construction site. Also, the sound power level regression model of the excavator drawn in this paper will help construction companies to plan the noise reduction program in the construction sites.
Sound Source Investigation of Outer Rotor BLDC Motor
Lee, Chang-Min ; Shin, Young-Hun ; Moon, Jung-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 208~213
DOI : 10.5050/KSNVE.2012.22.3.208
With great advancement of the automobile functions, environmental factors become important performances, especially noise. This paper investigates noise sources of outer rotor type BLDC motor using in the air-conditioner of the automobiles. To this end, this paper is analyzed two viewpoints, structural and electromagnetic causes. Structural analysis is conducted through modal test and analysis. For modal analysis, 3D finite element analysis is carried out using commercial program ansys. Electromagnetic causes are analyzed from local force that is computed by Maxwell stress tensor method. Local force excites structure of motor directly. Finally, correlation analysis is performed to determine effect between noise causes.
Development of Vibration Index for the Objective Evaluations of Idle Vibration Quality in a Passenger Car
Park, Hong-Seok ; Lee, Sang-Kwon ; Yoon, Gi-Soo ; Lee, Min-Sup ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 214~222
DOI : 10.5050/KSNVE.2012.22.3.214
Driver`s feeling is variously affected by lots of components such as engine, frame, wheels, and seats during the operation of automobiles. The main objective of this research is to identify the correlation between subjective evaluation and vibration metrics that was set by ISO to investigate development of the car vibration quality index using multiple linear regressions(MLR). A previous research related with automotive vibration quality used the method of calculating acceleration values of the point of a seat, a seat back, foot as RMS for objective evaluation. The automotive comfort is determined by RMS values. In comparison with the previous research, this study includes not only the vibration metrics, but also subjective values by jury evaluation. By indentifying the correlation between subjective evaluation and vibration metrics, the automotive vibration quality index is developed through MLR. Based on the results of this study, the proposed the automotive vibration quality index which developed through MLR will be helpful to obtain objective and reliable automotive comfort values.
Free Vibrations of Timoshenko Beam with Constant Volume
Lee, Byoung-Koo ; Lee, Tae-Eun ; Yoon, Hee-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 223~233
DOI : 10.5050/KSNVE.2012.22.3.223
This paper deals with free vibrations of the tapered Timoshenko beam with constant volume, in which both the rotatory inertia and shear deformation are included. The cross section of the tapered beam is chosen as the regular polygon cross section whose depth is varied with the parabolic function. The ordinary differential equations governing free vibrations of such beam are derived based on the Timoshenko beam theory by decomposing the displacements. Governing equations are solved for determining the natural frequencies corresponding with their mode shapes. In the numerical examples, three end constraints of the hinged-hinged, hinged-clamped and clamped-clamped ends are considered. The effects of various beam parameters on natural frequencies are extensively discussed. The mode shapes of both the deflections and stress resultants are presented, in which the composing rates due to bending rotation and shear deformation are determined.
A Development of Sound Quality Index of an Intake and Exhaust System for High Quality Improvement of Luxury Vehicles
Lee, Jong-Kyu ; Cho, Teock-Hyeong ; Seo, Dae-Won ; Lim, Yun-Soo ; Won, Kwang-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 234~243
DOI : 10.5050/KSNVE.2012.22.3.234
In this paper, a sound quality indices for the evaluation of vehicle intake and exhaust noise were developed through a correlation analysis of objective measurement data and subjective evaluation data. At first, intake and exhaust orifice noise were measured at the wide-open throttle sweep condition. And then, acoustic transfer function between intake orifice noise and interior noise at the steady state condition was measured. Also, acoustic transfer function for exhaust system was measured as the same method. Simultaneously, subjective evaluation was carried out by the paired comparison and semantic differential method by 27 engineers. Next, the correlation analysis between the psycho-acoustic parameters derived from the measured data and the subjective evaluation was performed. The most critical factor was determined and the corresponding sound quality index for the intake and exhaust noise was obtained from the multiple factor regression method. At last, the effectiveness of the proposed index was investigated.
Stability Evaluation on Aerodynamics of High Speed Railway Train
Choi, J.H. ; Park, T.W. ; Sim, K.S. ; Kwak, M.H. ; Lee, D.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 244~252
DOI : 10.5050/KSNVE.2012.22.3.244
Recently, the speed of a train has been increased. So the trains are being exposed to wind more severely than before. Because of the operation of high speed trains and lightweight of the train, risks of train derailment have being increased. In this study, aerodynamic effects of a newly designed high speed train, HEMU-400x, are evaluated. For aerodynamic effect evaluation, analysis method is selected by examining the safety standards for high speed train. The condition of aerodynamic effects is selected by adverse effect conditions. In order to calculate
coefficients, numerical analysis is conducted. Using
coefficients, the side force is calculated. Through dynamics analysis, derailment and wheel unloading are obtained. Using these results, derailment evaluation is performed.
Dynamic Analysis of a High-speed Wheel Moving on an Elastic Beam Having Gap with the Consideration of Hertz Contact
Lee, Ki-Su ; Kim, Seok-Seung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 253~263
DOI : 10.5050/KSNVE.2012.22.3.253
With the local Hertz deformation on the contact point, the dynamic contact between a high-speed wheel and an elastic beam having a gap is numerically analyzed by solving the whole equations of motion of the wheel and the beam subjected to the contact condition. For the stability of the time integration the velocity and acceleration constraints as well as the displacement constraint are imposed on the contact point. Especially the acceleration contact condition on the gap is formulated, and it is demonstrated that the contact force variation computed by the velocity contact constraint or by the acceleration contact constraint agrees well with that computed by the displacement contact constraint. The numerical examples show that, when the wheel passes on the gap, the solution is governed by the stiffness of the local Hertzian deformation.
Effect of the Properties of Sound Source and Transmission for the Evaluation of Subjective Response by the Exposure Time of Transportation Noise
Kim, Sun-Woo ; Kim, Won-Sik ; Song, Guk-Gon ; Kang, Jong-Ku ; Park, Hyeon-Ku ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 264~274
DOI : 10.5050/KSNVE.2012.22.3.264
Evaluation on the environmental noise is carried out by surveying subjective response of residents with physical measurement of noise during long period in field. Particularly field survey is used to make regulations from the analysis on how many people are annoyed for specific noise level, and laboratory test used to analyze the relationship between physical parameters of noise and subjective responses. In the laboratory controlling the variables is easy but the results could be biased because the condition in room would be different with field. Most of all noise exposure time is considered to be different with real situation, and this study aimed to evaluate the subjective response by exposure time of transportation noise, by applying three kinds of variable how much they give effects on the annoyance as the exposure time is operating condition, windows type and sound level. As a result there was somewhat difference between operating type and annoyance, which is caused by the sound characteristics operated in different condition. However the window type didn`t give much effect to the annoyance as much as sound type. This means that the subjective response could give similar result by exposure time even for different window types. Most of all, the main factor affecting subjective response is considered to be the sound level and the exposure time.
A Robust Track-following Control with Multiple Constraints Using Genetic Algorithm
Lee, Moon-Noh ; Lee, Hong-Kyu ; Jin, Kyoung-Bog ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 275~283
DOI : 10.5050/KSNVE.2012.22.3.275
This paper presents a design method of a robust tracking controller satisfying multiple constraints using genetic algorithm. A robust
constraint with loop shaping is used to address disturbance attenuation with error limits and a loop gain constraint is considered so as not to enlarge the tracking loop gain and bandwidth unnecessarily. The robust
constraint is expressed by a matrix inequality and the loop gain constraint is considered as an objective function so that genetic algorithm can be applied. Finally, a robust tracking controller can be obtained by integrating genetic algorithm with LMI approach. The proposed tracking controller design method is applied to the track-following system of an optical DVD recording drive and is evaluated through the experimental results.
Dynamic Modeling and Repulsive Force Control of Medical Hpatic Master
Oh, Jong-Seok ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 284~290
DOI : 10.5050/KSNVE.2012.22.3.284
In this research, a new type of haptic master device using electrorheological(ER) fluid for minimally invasive surgery(MIS) is devised and control performance of the proposed haptic master is evaluated. The proposed haptic master consists of ER bi-directional clutch/brake for 2 DOF rotational motion(X, Y) using gimbal structure and ER brake on the gripper for 1 DOF rotational motion (Z). Using Bingham characteristic of ER fluid and geometrical constraints, principal design variables of the haptic master are determined. Then, the generation of torque of the proposed master is experimentally evaluated as a function of applied field of voltage. A sliding mode controller which is robust to uncertainties is then designed and empirically realized. It has been demonstrated via experiment that the proposed haptic master associated with the controller can be effectively applied to MIS in real field conditions.
Energy Distribution Characteristics of Nonstationary Acoustic Emission Burst Signal Using Time-frequency Analysis
Jeong, Tae-Gun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 3, 2012, Pages 291~297
DOI : 10.5050/KSNVE.2012.22.3.291
Conventional Fourier analysis can give only limited information about the dynamic characteristics of nonstationary signals. Instead, time-frequency analysis is widely used to investigate the nonstationary signal in detail. Several time-frequency analysis methods are compared for a typical acoustic emission burst generated during the impact between a ferrite ceramic and aluminum plate. This AE burst is inherently nonstationary and random containing many frequency contents, which leads to severe interference between cross terms in bilinear convolution type distributions. The smoothing and reassignment processes can improve the readability and resolution of the results. Spectrogram and scalogram of the AE burst are obtained and compared to get the characteristics information. Renyi entropies are computed for various bilinear time-frequency transforms to evaluate the randomness. These bilinear transforms are reassigned by using the improved algorithm in discrete computation.