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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 25, Issue 12 - Dec 2015
Volume 25, Issue 11 - Nov 2015
Volume 25, Issue 10 - Oct 2015
Volume 25, Issue 9 - Sep 2015
Volume 25, Issue 8 - Aug 2015
Volume 25, Issue 7 - Jul 2015
Volume 25, Issue 6 - Jun 2015
Volume 25, Issue 5 - May 2015
Volume 25, Issue 4 - Apr 2015
Volume 25, Issue 3 - Mar 2015
Volume 25, Issue 2 - Feb 2015
Volume 25, Issue 1 - Jan 2015
Selecting the target year
Study on the Vehicle Sound Based on the Formant Filter and Musical Harmonics
Chang, Kyoung-Jin ; Park, Dong Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 525~531
DOI : 10.5050/KSNVE.2015.25.8.525
Driving sound is an effective element to promote the product identity of a vehicle by providing customers with attractive sound which reflects the concept of a vehicle. Recently, major automakers are focusing on the target sound setting so that the sound can represent the brand image as well as the unique concept of a vehicle. In this study, a new method of target setting for the driving sound will be introduced based on using formant filter and musical harmonics characteristics. In addition, a target sound suggested from this method will be realized and verified by using active noise control in vehicle.
Numerical Investigation Into Flow and Acoustic Performances of Intake Mufflers in Reciprocating Compressor
Kim, Sanghyeon ; Cheong, Cheolung ; Park, Jaeseong ; Kim, Haeseung ; Lee, Hyojae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 532~538
DOI : 10.5050/KSNVE.2015.25.8.532
In a reciprocating compressor, highly impulsive pressure fluctuations induced by a reciprocating piston give rise to serious noise and vibration problems. A muffler is frequently used to reduce this impulsive noise, but also has adverse effects on compressor performance due to additional pressure drop and heat transfer of refrigerants through it. Therefore, the flow and acoustic performances of mufflers used in a compressor should be considered simultaneously. In this study, both of flow and acoustic performances of mufflers are investigated using computational fluid dynamic techniques by solving full three-dimensional compressible Reynolds-Averaged Navier-Stokes equations. For validation purpose, the numerical method is initially applied to predict the transmission loss of a simple expansion muffler, and its predicted results show good agreements with theoretical and experimental results. Then, the flow and acoustic performances of an existing muffler is numerically investigated. On the basis of the analysis results, a new muffler is purposed and its performances are compared with the existing one. Improved performances of the new muffler are confirmed.
Effect of Source Line Location on Lift-off Acoustic Loads of a Launch Vehicle
Choi, Sang-Hyeon ; Ih, Jeong-Guon ; Lee, Ik-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 539~545
DOI : 10.5050/KSNVE.2015.25.8.539
Intense acoustic load is generated when a launch vehicle lifts off, causing the damaging vibrations at the launch vehicle or satellite within the fairing. This paper is concerned with the prediction of lift-off acoustic loads for a launch vehicle. As a test example, the lift-off acoustic load on the Korean launch vehicle, NARO, is predicted by the existing calculation tool, the modified Eldred's second method. Although the acoustic sources, assumed as point sources, are to be located along the center line of the exhaust plume when using the Eldred's prediction method, the exact location of the deflected center line of exhaust gas flow is not usually known. To search for the most appropriate source positions, six models of source line distribution are suggested and the acoustic load prediction results from these models are compared with the actual measurements. It is found that the predicted sound pressure spectrum of the Naro is the most similar to the measured data when the centerline of the turbulent kinetic energy contour is used as the source line.
Optimization of an Intake Flow Noise Induced from an Automotive Turbocharger
Park, Hoil ; Choi, Sungbae ; Jang, Seongsik ; Hwang, Junyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 546~552
DOI : 10.5050/KSNVE.2015.25.8.546
In the previous study, the air flow noise around 1.6 k~1.8 kHz was analyzed, and could be reduced by machining a groove in the bore of compressor inlet in front of the main blades of a compressor wheel. It was proven that this groove was very effective for removing the noise without critical sacrifice of compressor performance, and in addition, it did not noticeably deteriorate vehicle performance, drivability and acceleration. It is interesting that the type of groove tried for 1.6~1.8 kHz noise reduction could be effective for another air flow noise, 4 k~6 kHz which is the 3rd order frequency range of turbocharger speed. This study tried various shapes of grooves for minimizing engine performance difference as well as reducing the 3rd order noise. Finally, it was shown that the groove should be round for the engine performance, and an optimal size exist for the noise and the engine performance.
Vibration Monitoring and Diagnosis System Framework for 3MW Wind Turbine
Son, Jong-Duk ; Eom, Seung-Man ; Kim, Sung-Tae ; Lee, Ki-Hak ; Lee, Jeong-Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 553~558
DOI : 10.5050/KSNVE.2015.25.8.553
This paper aims at making a dedicated vibration monitoring and diagnosis framework for 3MW WTG(wind turbine generator). Within the scope of the research, vibration data of WTG drive train are used and WTG operating conditions are involved for dividing the vibration data class which included transient and steady state vibration signals. We separate two health detections which are CHD(continuous health detection) and EHD(event health detection). CHD has function of early detection and continuous monitoring. EHD makes the use of finding vibration values of fault components effectively by spectrum matrix subsystem. We proposed framework and showed application for 3MW WTG in a practical point of view.
Ultrasonic Transducers for Measuring Both Flow Velocity and Pipe Thickness
Kim, Ju Wan ; Piao, Chunguang ; Kim, Jin Oh ; Park, Doo-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 559~567
DOI : 10.5050/KSNVE.2015.25.8.559
The paper deals with an ultrasonic transducer invented for measuring both flow velocity and pipe thickness. The structure of the transducer is based on the conventional transducers for measuring flow velocity by obliquely transmitting ultrasonic waves to the flow direction. The transducer additionally generates ultrasonic waves transmitting vertically to a pipe for measuring pipe thickness. By measuring flow velocity with the invented transducer and a conventional oblique-incidence transducer and comparing their results, the accuracy of the flow velocity measurement of the invented one was evaluated. By measuring specimen thickness with the invented transducer and a conventional normal-incidence transducer and comparing their results, the accuracy of the thickness measurement of the invented one was evaluated.
Measurement of Aircraft Wing Deformation and Vibration Using Stereo Pattern Recognition Method
Kim, Ho-Young ; Yoon, Jong-Min ; Han, Jae-Hung ; Kwon, Hyuk-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 568~574
DOI : 10.5050/KSNVE.2015.25.8.568
The present study was conducted by using stereo pattern recognition method(SPR method) to measure the displacement and vibration of an airplane wing in flight condition. A SPR based measurement system was developed using two visible light stereo cameras. The visible light stereo images were processed to obtain marker points by adaptive threshold method and marker filtering technique. The marker points were used to reconstruct 3D point, displacement, and vibration data. The SPR system was installed on F-16 fighter. The wing displacement and vibration were measured in flight condition. Therefore, this paper presents a possibility that SPR based measurement system using visible light stereo camera can be very useful for measuring displacement and vibration of an airplane in flight condition.
Dispersion Characteristics of Cylindrical Shells Submerged in the Fluid
Jung, Byung-Kyoo ; Hong, Chinsuk ; Ryue, Jungsoo ; Jeong, Weui-Bong ; Shin, Ku-Kyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 8, 2015, Pages 575~582
DOI : 10.5050/KSNVE.2015.25.8.575
This paper deals with the dispersion relation of the waves sustained in a cylindrical shell submerged in the fluid. The waveguide finite method and the boundary element method are used to predict the dispersion characteristic of the cylindrical shell. The dispersion diagram of the cylinder is estimated from the eigenvalue problem and the forced vibration response. It follows that the water-loading leads to the decrease of the cut-on frequencies and the phase speeds of the bending waves. On the contrary, the longitudinal waves and the torsional waves are hardly affected by the fluid, and therefore the order of the cut-on frequencies of the waves is changed. The acoustic dispersion diagram is also estimated from the forced acoustic response to identify the characteristics of the wave radiated to the fluid. It follows that the acoustic waves on and near the surface of the cylinder are the same as those in the structure. But at the far field the acoustic waves caused by subsonic waves e.g., the bending waves disappear as the increase of the distance. Conclusively, the characteristics of waves in cylindrical shells are significantly affected by water-loading in terms of the cut-on frequency, the wave speed, the order of the cut-on and radiation.