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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
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Journal DOI :
The Korean Society for Noise and Vibration Engineering
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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
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Simplified Finite Element Model Building of an External Mounting Pod for Structural Dynamic Characteristics Analysis of an Aircraft
Lee, Jong-Hak ; Ryu, Gu-Hyun ; Yang, Sung-Chul ; Kim, Ji-Eok ; Jung, Dae-Yoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 495~501
DOI : 10.5050/KSNVE.2012.22.6.495
In this study, the natural frequencies and mode shape of an external mounting pod were verified using the modal analysis and modal testing technique for a pod mounted on an aircraft. The procedure associated with the FE model building of an external mounted pod to predict the dynamic behavior of aircraft structures is described. The simplified FE model reflecting the results of the modal testing of a pod is built through the optimization and will be applied to the structural dynamic model of an aircraft which is used to verified the stability of vibration and flutter of an aircraft.
A Musculoskeletal Model of a Human Lower Extremity and Estimation of Muscle Forces while Rising from a Seated Position
Jo, Young-Nam ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 502~508
DOI : 10.5050/KSNVE.2012.22.6.502
An analytical model for a human body is important to predict muscle and joint forces. Because it is difficult to estimate muscle or joint forces from a human body, the objective of this study is the development of a reliable analytical model for a human body to evaluate the lower extremity muscle and joint forces. The musculoskeletal system of the human lower extremity is modeled as a multibody system employing the Hill-type muscle model. Muscle forces are determined to minimize energy consumption, and we assume that motion is constrained in the sagittal plane. Muscle forces are calculated through an equilibrium analysis while rising from a seated position. The musculoskeletal model consists of four segments. Each segment is a rigid body and connected by frictionless revolute joints. Muscles of the lower extremity are simplified to seven muscles with those that are not related to the sagittal plane motion are ignored. Muscles that play a similar role are combined together. The results of the present study are compared with experimental results to validate the lower extremity model and the assumptions of the present study.
Design of Sound Quality Index for Laser Printers and Its Application for Improvement Study
Kim, Eui-Youl ; Lee, Young-Jun ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 509~523
DOI : 10.5050/KSNVE.2012.22.6.509
The sound quality based on design optimization, throughout the development process of various electronic office equipments, needs to be considered in order to respond the increased needs for the emotional satisfaction of customers in terms of psycho-acoustics. This paper focuses on how to describe the characteristics of operating sound radiated from laser printers by using various sound attributes, and to model the sound quality index that can properly evaluate the subjective preference on modification conditions in the improvement study quantitatively. Especially, the proposed verification process, in the form of combining the correlation based method and the decision error based method, was applied to improve the generality and reliability of a group of participants in the jury evaluation. The modified Aures tonality model was also proposed to improve the correlation coefficient with the mean response of participants by optimizing some parameters. As a result, the loudness, articulation index, roughness, tonality, fluctuation strength were used to model the sound quality index for laser printers by using the multiple-linear regression method. Through the improvement study, it was confirmed that replacing the absorbing materials is effective to reduce the tonalness radiated from the side of a reference printer model. Based on above results, it can be concluded that the proposed model has enough usefulness as quantitative evaluation index to evaluate the difference between modification conditions in the improvement study.
Efficient and Accurate Prediction of Flat Pate Trailing Edge Noise Using Semi-analytic Model for Point Pressure Spectra
Lee, Gwang-Se ; Cheong, Cheol-Ung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 524~534
DOI : 10.5050/KSNVE.2012.22.6.524
In order to predict trailing edge noise from a flat plate more effectively and accurately, the prediction algorithm based on semi-analytic model for point pressure spectrum is proposed. The semi-analytic model consists of empirical models for point pressure spectra and theoretical model to determine the boundary layer characteristics needed for the empirical models. The proposed methods are applied to predict the trailing edge noise of the flat plate located in the mean flow of speed 38 m/s, for which the measured data are available. In present study, six empirical models for point pressure spectra are utilized for the predictions of trailing edge noise and their prediction results are compared to the measured data. Through the analysis of these comparisons, it is revealed that the present method based on non-frozen formula using Efimtsov model and Smol`yakov-Tkachenko model can provide more accurate and efficient predictions of trailing edge noise.
Equivalent Discomfort Curve on Idle Vibration Frequency of Passenger Vehicle
Jeon, Gyeoung-Jin ; Lee, Jae-Young ; Ahn, Se-Jin ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 535~541
DOI : 10.5050/KSNVE.2012.22.6.535
The three-down one-up method which is commonly used in the field of psychophysics is employed in this study that is to reveal how much magnitude of vibration makes discomfort in passenger vehicle on idle condition. Thirteen taxi drivers were invited for subject of the experiment where they evaluated the controlled vibrations on rigid seat in terms of idle vibration on passenger vehicle at frequency range from 15 Hz to 40 Hz. As the result, vibration of 100~105 dB is marginal range to make discomfort on passenger seat. Frequency dependency of the discomfort was found at the frequency range, which is the higher frequency the lower discomfort with the same magnitude of vibration. The frequency dependency found here was compared with ISO 2631-1 that is more sensitive at the frequency range.
Maneuvering and Active Vibration Control of Slewing Flexible Beam Using Input Shaper
Kwak, Moon-K. ; Yang, Dong-Ho ; Lee, Jae-Ha ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 542~549
DOI : 10.5050/KSNVE.2012.22.6.542
This research is concerned with the derivation of equations of motion for a slewing beam and the application of input shaper to the bang-bang control to achieve vibration suppression. When a uniform beam with a tip mass rotates about the axis perpendicular to the undeformed beam`s longitudinal axis, it experiences inertial loading. Hence, the beam vibrates. In this paper, we used the input shaper for the maneuvering control to suppress vibrations. The maneuvering control which can achieve a minimum-time control is a bang-bang control. The input-shaped bang-bang maneuvering is used to suppress vibrations both theoretically and experimentally. The slewing beam experiment is not an easy subject because of the inherent damping existing inside the rotor. We propose the use of a negative damping to eliminate the rotor damping. Numerical and experimental results show that the input-shaper can be effectively used for the vibration suppression of a slewing beam.
A Study on BSR Noise and Sound Quality Property for Vehicle Interior Module
Shin, Su-Hyun ; Cheong, Cheol-Ung ; Jung, Sung-Soo ; Kang, Dae-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 550~555
DOI : 10.5050/KSNVE.2012.22.6.550
Among the various elements affecting a customer`s evaluation of automobile quality, buzz, squeak and rattle(BSR) have been considered to be major factors. In most vehicle manufacturers, the BSR problems are solved by find-fix method with the vehicle road test, mainly due to various excitation sources, complex generation mechanism and subjective response. To systematically tackle the BSR problems in early stage of the vehicle development cycle, these difficulties should be resolved. The aim of the present paper is to characterize the sound quality property of BSR noise that can be used to assess the subjective responses to BSR. The four sound metrics from Zwicker`s sound quality parameter are computed for the signals recorded for eight BSR noise source regions localized by using the acoustic-field visualized results. Then, the jury test of BSR noise are performed. On the basis of the computed sound metrics and jury test result is evaluated to represent the harshness of BSR noise. It is expected that the developed BSR measuring system and sound quality properties can be used to reduce the automotive interior BSR noise in terms of subjective levels as well as objective levels.
A Comparative Study on the Dynamic Characteristics and Control Performances of Hybrid Mounts According to Element Configuration
Cho, H.Y. ; Moon, S.J. ; Shin, Y.H. ; Jung, W.J. ; Won, M.C. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 556~563
DOI : 10.5050/KSNVE.2012.22.6.556
This study focuses on the element configuration of hybrid mounts which are combined with passive elements and active elements. The seven configurations are presented according to connection of an active element to a passive element. The dynamic characteristics and control performance of them are investigated qualitatively using Bode plots. With reference to the transmitted force from internal to external, three cases are selected. In addition, some numerical simulations for the three cases are carried out to confirm the performance quantitatively. Based on this research results, a novel hybrid mount with excellent performance will be able to be developed.
Sound Quality Evaluation for Laundry Noise by a Virtual Laundry Noise Considering the Effect of Various Noise Sources in a Drum Washing Machine
Jeong, Jae-Eun ; Yang, In-Hyung ; Fawazi, Noor ; Jeong, Un-Chang ; Lee, Jung-Youn ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 564~573
DOI : 10.5050/KSNVE.2012.22.6.564
The objective of this study is to determine the effect for the sound quality according to the noise source and to build the sound quality index of the laundry noise. In order to compare laundry noise among the influence of noise sources, we made virtual laundry noises by synthesizing an actual laundry noise and each noise source such as a dropping noise, water noise, motor noise and circulation pump noise. We conducted a listening test by customers using virtual laundry noises. As a result of listening test, we found that the dropping noise has a decisive effect on the sound quality of the laundry noise. We conducted the multi regression analysis of sound quality for the laundry noise using the statistical data processing. It is verified to the reliability of the multi regression index by comparison with listening results and index results of other actual laundry noises. This study is expected to provide a guide line for improvement of the laundry noise.
Development of an Integrated Management System for Maintenance Parameters and Rotary Machine of Hydro-power Plant
Shin, Sung-Hwan ; Park, Jin-Ho ; Yoon, Doo-Byung ; Son, Ki-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 574~581
DOI : 10.5050/KSNVE.2012.22.6.574
Condition-based maintenance(CBM) has been used as a useful concept for optimizing maintenance plan and decreasing maintenance cost in several kinds of plant sites. This study introduced an example that developed an integrated management system for maintenance parameters and hydraulic turbine of hydro-power plant in order to improve its maintenance strategy as applying CBM techinique. The integrated management system consists of three parts. One is a hardware part including PDA inspection system and several kind of precision measuring instruments. Another is a vibration monitoring system on hydraulic turbine. The other is a software part that takes charge of making hierarchy tree of maintenance parameters and their inspection route, managing accumulated database, assessing health condition of components, and supporting interface with other enterprise management system. The system has been installed at Chuncheon hydro-power plant for test and demonstration. It is expected that the system can contribute database construction for diagnostics and prognostics on facility health condition and systematic accumulation of know-how on operation and maintenance of plant.
A Study of Vibration Damping Control for Hollow Drive Shaft
Park, Jeong-Heon ; Hong, Sung-Geun ; Lee, Kwang-Hee ; Lee, Chul-Hee ; Kim, Cheol-Hyun ; Cho, Won-Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 6, 2012, Pages 582~587
DOI : 10.5050/KSNVE.2012.22.6.582
This paper presents a solution of the vibration reduction in the hollow shafts by using magentorehological( MR) elastomer. Proposed active damping structure is built by embedding the MR elastomers whose elastic modulus is controllable by an applied magnetic field. MR elastomers consist of synthetic rubber filled with micron-sized magnetizable particles. For reduction of vibration, dynamic damper of hollow shaft is designed by using MR elastomer and equipped in the hollow shaft for the application to drive shaft. Experiment results are shown through the experiments to confirm the effect of MR elastomer dynamic damper for vibration reduction. Thus, the designed damping structure can be applied to vibration absorber used in drive shafts as well as the propeller shafts.