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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
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Volume & Issues
Volume 24, Issue 12 - Dec 2014
Volume 24, Issue 11 - Nov 2014
Volume 24, Issue 10 - Oct 2014
Volume 24, Issue 9 - Sep 2014
Volume 24, Issue 8 - Aug 2014
Volume 24, Issue 7 - Jul 2014
Volume 24, Issue 6 - Jun 2014
Volume 24, Issue 5 - May 2014
Volume 24, Issue 4 - Apr 2014
Volume 24, Issue 3 - Mar 2014
Volume 24, Issue 2 - Feb 2014
Volume 24, Issue 1 - Jan 2014
Selecting the target year
A Study of Sound Absorbing Characteristics of the Railway Noise Barrier with Respect to Front Perforated Panel and Absorbing Material
Kim, Kwanju ; Lee, Junheon ; Kim, Sanghun ; Park, Jinkyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 275~281
DOI : 10.5050/KSNVE.2014.24.4.275
This study has been analyzed the sound performance of the noise barriers with respect to the configuration of the front perforated panel geometries and the filled absorption materials. Noise barriers` acoustic performance should be required to meet 0.7 of NRC value at least. The global absorbing performance of the barriers have been investigated by changing the opening ratio of the front perforated panel and the absorbing characteristics of the absorbing material using two microphone method. Therefore, It it possible to obtain to increase acoustic performance of the specific frequency ranges by designing the perforate rates of the front panel and absorbing characteristics of the absorbing materials inside, as well. This study try to find out the possibilities of applying the absorbing noise barrier to railway usage.
Building Korean Head-related Transfer Function Database
Son, Daehyuk ; Park, Youngjin ; Park, Yoonsik ; Jang, Sei-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 282~288
DOI : 10.5050/KSNVE.2014.24.4.282
Three-dimensional multimedia industry such as 3D TV, movie and broadcast has been developed vividly. For generating 3D contents with high quality, virtual auditory display, so called VAD, is being researched to offer more realistic experience to listeners. When people render VAD using headphones or two speakers, head-related transfer function(HRTF) plays a key role. The best solution is measuring all individuals` HRTFs, but it is hard to measure all listeners` HRTFs. To overcome this difficulty, many research groups have tried to construct their own measurement system and to build HRTF databases. However, some of them have not enough subjects or spatial resolution and they are mainly focused on Caucasian. There exists difference between Korean and Caucasian in a view of physical features. In other words, if Koreans hear three-dimensional sound rendered by HRTF database based on Caucasian, performance might be hindered. To verify this possibility and remedy the drawbacks, construction of new HRTF database aimed at Korean is needed. Therefore, our laboratory built HRTF measurement system which can measure HRTF of three-dimensional space with dense spatial resolution. With this system, 55 Korean males and 45 females` HRTFs were measured and Korean HRTF database was built based on these data.
Analysis of Annoyance of Various Train Pass-by Noise Using Binaural Recording
Park, Buhm ; Koh, Hyo-In ; Park, Junhong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 289~298
DOI : 10.5050/KSNVE.2014.24.4.289
Pass-by noises of various trains were recorded by binaural recorder. The measured noises were evaluated using a sound pressure level and psychoacoustic metrics objectively. To analyze a binaural effect on annoyance that can be caused by train noise, auditory experiments were performed. Through the experiments, the annoyance differences between monaural and binaural train noises, the annoyance differences due to measurement angle and the annoyance differences due to kinds of train and measurement distance were determined. A correlation analysis was conducted to determine which index can affect the annoyance more strongly. As the result, a maximum rate of change of sharpness difference between left and right channels was proposed to predict the annoyance.
Precision Circular-path Walking of a Biped Robot with Consideration of Rotational Effects
Lim, Seungchul ; Kwak, Byungmoon ; Lim, Jooyoung ; Son, Youngik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 299~309
DOI : 10.5050/KSNVE.2014.24.4.299
When biped robots make turns, the ability to walk stably and precisely along any circular path is crucial. In this context, inverse kinematics solutions are found for accurate gait realization, and new zero moment point(ZMP) equations are derived with respect to the cyclindrical coordinate system to facilitate generation of stable walking patterns. Then, appropriate steady and transitional walking patterns are both proposed in form of time functons. Subsequently, walking patterns for a path but of different speeds are generated using the functions and associated formulas, and preliminarily checked for stability based on the ZMP equations. Upon comparison of those cases, one can see how and when robots may fall down during circular walking. Finally, those patterns are put to test on the sample robot by ADAMS(R) along with the inverse kinematics solutions and a new balance control scheme compensating for insufficient stability particulary during the initial transition period. Test results show that the robot can walk along the circular path as predicted at a resonably high speed despite the distributed mass and ground contact effects, validating effectiveness of the suggested approach.
Comparative Study on the Measures of Similarity for the Location Template Matching(LTM) Method
Shin, Kihong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 310~316
DOI : 10.5050/KSNVE.2014.24.4.310
The location template matching(LTM) method is a technique of identifying an impact location on a structure, and requires a certain measure of similarity between two time signals. In general, the correlation coefficient is widely used as the measure of similarity, while the group delay based method is recently proposed to improve the accuracy of the impact localization. Another possible measure is the frequency response assurance criterion(FRAC), though this has not been applied yet. In this paper, these three different measures of similarity are examined comparatively by using experimental data in order to understand the properties of these measures of similarity. The comparative study shows that the correlation coefficient and the FRAC give almost the same information while the group delay based method gives the shape oriented information that is best suitable for the location template matching method.
Vibration of Elevator Rope with a Spring-mass System at the Tip
Kwak, Moon K. ; Han, Sangbo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 317~323
DOI : 10.5050/KSNVE.2014.24.4.317
This study is concerned with the free vibration analysis of an inextensible uniform rope with a spring-mass system at the tip. The rope is hanged vertically in a gravitational field. This problem is related to the free vibration of an elevator rope connected to an elevator cage. The equation of motion and the corresponding boundary conditions are derived by using the Hamilton`s principle. The general solution of the governing equation of motion is expressed in terms of Bessel functions. The characteristic equation was derived by applying the boundary conditions. The characteristic values which are in fact non-dimensionalized natural frequencies were obtained numerically. The effects of mass and spring constant were investigated. The numerical results show how the tip mass and spring affect the natural frequencies of the rope.
Mode Separation in Torsional Guided Waves Using Chirplet Transform
Kim, Young-Wann ; Park, Kyung-Jo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 324~331
DOI : 10.5050/KSNVE.2014.24.4.324
The sensor configuration of the magnetostrictive guided wave system can be described as a single continuous transducing element which makes it difficult to separate the individual modes from the reflected signal. In this work we develop the mode decomposition technique employing chirplet transform based on the maximum likelihood estimation, which is able to separate the individual modes from dispersive and multimodal waveform measured with the magnetostrictive sensor, and estimate the time-frequency centers and individual energies of the reflection, which would be used to locate and characterize defects. Simulation results on a carbon steel pipe are presented, which show the accurate mode separation and more discernible time-frequency representation could become enabled using the proposed technique.
Characteristics of Friction Noise with Changes of the Natural Frequencies in the Reciprocating Motion
Choi, Hoil ; Kang, Jaeyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 332~338
DOI : 10.5050/KSNVE.2014.24.4.332
Experimental study is conducted for investigating the characteristics of friction-induced noise with respect to the variation of system geometry. In this study, a vertically fixed rod is in contact with the reciprocating plate which is controlled by the step motor. Friction noise is generated during the reciprocating motion due to the frictional contact between the plastic pin and the aluminum plate. The frequencies of the friction noise are changed when the height of the rod varies. However, it is found that the vibration modes involved in the friction noise are not changed. It implies that the unstable modes remain unstable regardless of the change of the system geometry, and thus, there are the certain mode shapes which are likely to produce friction noise.
Floor Impact Sound Pressure Level Characteristics by the Change of Reverberation Time in Mock-up Test Rooms
Jeong, Jeong Ho ; Lee, Byung Kwon ; Yeon, Jun Oh ; Jeon, Jin Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 339~347
DOI : 10.5050/KSNVE.2014.24.4.339
Floor impact sound in high-rise apartment building became one of social problems. A lot of civil complaints on floor impact sound occur continuously and the number of disputes between neighbors in small and aged apartment buildings is increasing. Interests on heavy-weight impact sound pressure level measurement and evaluation method is increased. Previous study reported that heavy-weight impact sound level was changed by the sound field condition of receiving reverberation chamber. In this study, heavy-weight impact sound pressure level change by the receiving sound field condition was measured in standard test facility and mock-up test room. These two experimental conditions were designed to simulate averaged living room of common apartment units. By the change of sound absorption power in receiving room, heavy-weight impact sound pressure level in most of frequency bands were changed in standard test facility and mock-up room. Normalized maximum sound pressure level regulated in ISO 16032 showed wider range of heavy/soft impact sound pressure level. Heavy/soft impact sound pressure level change was became smaller by the application of standardized maximum sound pressure level and ISO/CD 10140-3 Amd 2 method. In the case of standardized maximum sound pressure level, absolute sound pressure level changed. From these results, receiving sound field correction method regulated in ISO/CD 10140-3 Amd 2 is needed for the precision measurement and evaluation of heavy-weight impact sound.
The Spatial Statistical Relationships between Road-traffic Noise and Urban Components Including Population, Building, Road-traffic and Land-use
Ryu, Hunjae ; Park, In Kwon ; Chang, Seo Il ; Chun, Bum Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 4, 2014, Pages 348~356
DOI : 10.5050/KSNVE.2014.24.4.348
To understand the relationship between road-traffic noise and urban components such as population, building, road-traffic and land-use, the city of Cheongju that already has road-traffic noise maps of daytime and nighttime was selected for this study. The whole area of the city is divided into square cells of a uniform size and for each cell, the urban components are estimated. A spatial representative noise level for each cell is determined by averaging out population-weighted facade noise levels for noise exposure population within the cell during nighttime. The relationship between the representative noise level and the urban components is statistically modeled at the cell level. Specially, we introduce a spatial auto regressive model and a spatial error model that turns out to explain above 85 % of the noise level. These findings and modeling methods can be used as a preliminary tool for environmental planning and urban design in modern cities in consideration of noise exposure.