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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 23, Issue 12 - Dec 2013
Volume 23, Issue 11 - Nov 2013
Volume 23, Issue 10 - Oct 2013
Volume 23, Issue 9 - Sep 2013
Volume 23, Issue 8 - Aug 2013
Volume 23, Issue 7 - Jul 2013
Volume 23, Issue 6 - Jun 2013
Volume 23, Issue 5 - May 2013
Volume 23, Issue 4 - Apr 2013
Volume 23, Issue 3 - Mar 2013
Volume 23, Issue 2 - Feb 2013
Volume 23, Issue 1 - Jan 2013
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Harmonic Response Estimation Method on the Lévy Plate with Two Opposite Edges Having Free Boundary Conditions
Park, Nam-Gyu ; Suh, Jung-Min ; Jeon, Kyeong-Lak ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 943~950
DOI : 10.5050/KSNVE.2013.23.11.943
This paper discusses a harmonic response estimation method on the L
vy plate with two opposite edges simply supported and the other two edges having free boundary conditions. Since the equation of motion of the plate is not self-adjoint, the modes are not orthogonal to each other on the domain. Noting that the L
vy plate can be expressed using one term sinusoidal function that is orthogonal to other sinusoidal functions, this paper suggested the calculation method that is equivalent to finding a least square error minimization solution of the finite number of algebraic equations. Example problems subjected to a distributed area loading and a distributed line loading are defined and their solutions are provided. The solutions are compared to those of the commercial code, ANSYS. According to the verification results, it is expected that the suggested method will be useful to predict the forced response on the L
vy plate with the distributed area or line loading conditions.
Sweet Spot Analysis of Linear Array System with a Large Number of Loudspeakers by Geometrical Approach Method
Yang, Hunmin ; Park, Youngjin ; Park, Youn-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 951~956
DOI : 10.5050/KSNVE.2013.23.11.951
This paper describes techniques used to analyze the sweet spot of sound field reproduced by ear-level linear arrays of loudspeakers by geometrical approach method. Previous researches have introduced various sweet spot definitions in their own way. In general, sweet spot is defined as an area whose stereophonic sound effect is valid. Its size is affected by the geometrical arrangement of the system. In this paper, a case when plane waves are generated by linear arrays of loudspeakers in the horizontal plane is considered. So the sweet spot is defined as an area in which the listener can perceive the desired azimuth angle. Because there are many loudspeakers, impulse responses at listener's ears are in the form of pulse-train and the time-duration of the pulse-train affects the localization performance of the listener. So we calculated the maximum time duration of pulse-train by geometrical approach method and identified with the results of impulse response simulation. This paper also includes parameter analysis with respect to aperture size, so it suggests a tool for sound engineers to expect the sweet spot size and listener's sound perception.
A Study on the Squeal Noise Instability Analysis on Caliper Brake
Lee, Junghwan ; Kim, Seonghwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 957~965
DOI : 10.5050/KSNVE.2013.23.11.957
This paper deals with analytical methods for low frequency and high frequency brake squeal noise on brake-rear caliper. In order to improve low frequency and high frequency squeal noise, we take survey caliper bracket shape parameters and housing shape parameters. Besides, using the combination of bracket and housing parameter were surveyed. Thus, using the combination of bracket Alt_05 and housing Alt_45 specifications, instability analysis and brake dynamo test were carried out. Based upon the two models, low and high frequency squeal noise of base model were improved. But, for 6.0 kHz frequency noise, which is not improved, it needs to additionally study on instability analysis and combination of the other brake components.
Tilt Angle Estimation of Plane with a Pair of Accelerometers and a Gyroscope
Kang, Min Sig ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 966~972
DOI : 10.5050/KSNVE.2013.23.11.966
Measurement or estimation of tilt angle is necessary for balancing robot such as Segway which is considered as a next generation transportation vehicle. However, it requires high-cost accurate sensors to hold balancing during stationary and moving situations. In this paper, a tilt angle estimation of a plane rotating in a vertical plane using low-cost sensors. Estimation using a set of 2-axis orthogonal accelerometers along with an inaccurate rate gyro has been considered. Feasibility and performance of the proposed technique has been verified through some experimental results.
Topology Optimization of an Acoustic Diffuser Considering Reflected Sound Field
Yang, Jieun ; Lee, Joong Seok ; Kim, Yoon Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 973~981
DOI : 10.5050/KSNVE.2013.23.11.973
The main role of an acoustic diffuser is to diffuse reflected sound field spatially. Since the pioneering work of Schroeder, there have been investigations to improve its performance by using shape/sizing optimization methods. In this paper, a gradient-based topology optimization algorithm is newly presented to find the optimal distribution of reflecting materials for maximizing diffuser performance. Time-harmonic acoustic analysis in a two-dimensional acoustic domain is carried out where the domain is discretized by finite elements. Perfectly matched layers are placed to surround the domain to simulate non-reflecting boundary conditions. Design variables are assigned to each element of which material properties are interpolated between those of air and those of a rigid body. An approach to extract the reflected field from the total acoustic field is employed. To validate the effectiveness of the proposed method, design problems are solved at different frequencies. The performance of the optimized diffusers obtained by the proposed method is compared against that of the conventional Schroeder diffusers.
Study on a Applicability of the Low Noise Labeling System for a Construction Machinery
Gu, Jinhoi ; Lee, Wooseok ; Seo, Chungyoul ; Lee, Jaewon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 982~986
DOI : 10.5050/KSNVE.2013.23.11.982
The noise emitted from construction machinery has long been a cause of environmental disputes, especially to the nearby residents. In 2008, the Ministry of Environment adopted the construction machinery noise labeling system to encourage the development of the low noise construction machinery. After the implementation of the noise labeling system of the construction machinery, the noise emitted from the construction machinery has been decreased over the six years. But, as the quality of life improves, a growing number of people desire more comfortable and quite living environment. Under the situation, new systems like the low noise labeling system are considered to encourage the development of the low noise construction machinery. In accordance with the low noise labeling system, the construction machinery satisfying the standard of low noise are qualified to attach the low noise label in front of the products. Thus, the product qualified the low noise certification will be incentivized by the choice of the consumer. In this paper, we have studied the necessity of the low noise labeling system for the construction machinery and the considerations to adopt the low noise labeling system of construction machinery. And we have studied appropriate criterion to judge the low noise construction machinery. The considerations studied in this paper will be helpful to adopt the low noise labeling system of construction machinery in the future.
FE Model Calibration of Myeong-dong Cathedral Using Vibration Measurement Data
Hwang, In Hwan ; Jeon, Jin Yong ; Kim, Ji Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 987~995
DOI : 10.5050/KSNVE.2013.23.11.987
One of the most important processes to accurately predict structural responses is to evaluate accurate structural dynamic characteristics using finite element(FE) models. The numerical structural dynamic characteristics usually show considerable discrepancies with the measured ones because structural details are commonly simplified in the FE models. To identify such discrepancies, FE models of them have been calibrated using the measured dynamic characteristics in previous researches. In this study, the dynamic characteristics were measured for a historic cathedral and the FE model of it was calibrated using the measured results as a reference. Finally, a procedure of the FE model construction for the unreinforced masonry cathedral were tentatively proposed.
A Study on the Stiffness Design for a Steel Spring Torsional Vibration Damper
Lee, D.H. ; Chung, T.Y. ; Kim, Y.C. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 996~1002
DOI : 10.5050/KSNVE.2013.23.11.996
Conditions of stiffness for a steel spring torsional vibration damper are difficult and ambiguous. Nevertheless correct estimation of stiffness is essential and important in the damper design for the damper to activate properly in the field. In this paper, to build up the estimation method of steel spring torsional vibration damper a miniaturized model was developed for modelling between a spring and inner star of the damper. The method obtained from the results through the experiment and analysis of it was applied to the prototype torsional damper.
New Formulation of MNDIF Method for Accurate Eigenvalue Analysis of Concave Acoustic Cavities
Kang, S.W. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 1003~1011
DOI : 10.5050/KSNVE.2013.23.11.1003
A new formulation of the MNDIF method is introduced to extract highly accurate eigenvalues of concave acoustic cavities. Since the MNDIF method, which was introduced by the author, can be applicable for only convex acoustic cavities, a new approach of dividing a concave cavity into two convex domains and formulating an algebraic eigenvalue problem is proposed in the paper. A system matrix equation, which gives eigenvalues, is obtained from boundary conditions for each domain and the condition of continuity in the interface between the two domains. The validity and accuracy of the proposed method are shown through example studies.
A Study on Field Evaluation and Sound Insulation Improvement of Door
Oh, Jin Kyun ; Lee, Won Yeul ; Yum, Sung Gon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 1012~1019
DOI : 10.5050/KSNVE.2013.23.11.1012
Recently, awareness of noise is increased and high performance sound insulation performance wall is designed. But in spite of installing high performance sound insulation performance wall, sound insulation performance in space is reduced by door. In this study, Sound insulation performance of doors which commonly used in buildings was measured to analyze current situation in the field and effect of method which increase sound insulation performance is analyzed quantitatively. As a result, sound insulation performance of doors which commonly used in buildings is FSTC 17~29 and can be increased about 2~3 dB by install rubber seal or mohair.
Study on the Noise Source Modeling and the Source Strength Estimation of Mugungwha Trains Running on the Conventional Railway
Jang, Seungho ; Jang, Eunhye ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 11, 2013, Pages 1020~1026
DOI : 10.5050/KSNVE.2013.23.11.1020
An accurate railway environmental noise prediction model is required to make the proper solution of the railway noise problems. In this paper, an engineering model for predicting the noise of conventional passenger cars is presented considering the acoustic source strength in octave-band frequencies and the propagation over grounds with varying surface properties. Since the formation of a train can be variable, the source strength of each locomotive and passenger car was estimated by measuring the pass-by noise and analysing the wheel-rail rolling noise. Some validation cases show on the average small differences between the predictions of the present model and the measurement results.