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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
Benchmark Test of CFD Software Packages for Sunroof Buffeting in Hyundai Simplified Model
Cho, Munhwan ; Oh, Chisung ; Kim, HyoungGun ; Ih, Kang-duck ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 171~179
DOI : 10.5050/KSNVE.2014.24.3.171
Sunroof buffeting is one of the most critical issues in the vehicle wind noise phenomena. The experimental approach to solve this issue typically requires a lot of time and resources. To reduce time and cost, the numerical approach could be taken, which can also privide more insights into physical phenomena involved in sunroof buffeting, only if the accuracy in its predictions are guranteed. The benchmark test of various numerical solvers is carried out for the buffeting behavior of a simplified vehicle body, the Hyundai simplified model(HSM). The results of each solver are compared to the experimental measurements in a Hyundai aeroacoustic wind tunnel(HAWT) at various wind speeds. In particular, acoustic response tests were performed and the results were provided prior to all simulations in order to consider the real world effects that could introduce discrepancies between the numerical and experimental approaches. Through this study, most solvers can demonstrate an acceptable accuracy level for actual commercial development and high precision experimental data and computational prediction priories can be shared in order to promote the numerical accuracy level of each numerical solver.
Numerical Investigation of Sunroof Buffeting for Hyundai Simplified Model
Khondge, Ashok ; Lee, Myunghoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 180~188
DOI : 10.5050/KSNVE.2014.24.3.180
Hyundai Motor Group(HMG) carried out experimental investigation of sunroof buffeting phenomena on a simplified car model called Hyundai simplified model(HSM). HMG invited participation from commercial CFD vendors to perform numerical investigation of sunroof buffeting for HSM model with a goal to determine whether CFD can predict sunroof buffeting behavior to sufficient accuracy. ANSYS Korea participated in this investigation and performed numerical simulations of sunroof buffeting for HSM using ANSYS fluent, the general purpose CFD code. First, a flow field validation is performed using closed sunroof HSM model for 60 km/h wind speed. The velocity profiles at three locations on the top surface of HSM model are predicted and compared with experimental measurement. Then, numerical simulations for buffeting are performed over range of wind speeds, using advanced scale resolving turbulence model in the form of detached eddy simulation (DES). Buffeting frequency and buffeting level are predicted in simulation and compared with experimental measurement. With reference to comparison between experimental measurements with CFD predictions of buffeting frequency and level, conclusion are drawn about predictive capabilities of CFD for real vehicle development.
PowerFLOW Simulation of the Hyundai Simple Model for Sunroof Buffeting
Choi, Eui-Sung ; Cyr, Stephane ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 189~197
DOI : 10.5050/KSNVE.2014.24.3.189
A simplified model in the shape of a wedge box with an opening on the roof was used to generate buffeting conditions at HMC. These measurements performed in controlled conditions are intended to validate the ability of CFD tools to predict buffeting. The results obtained by PowerFLOW are presented in this paper for buffeting and for the boundary layer development on the roof of the model when the roof opening is closed. The flow mechanisms that explain the behavior of the experimental sound pressure level(SPL) curve are described, and an improved setup is used to reproduce the flow structures that lead to the measured SPL.
Sunroof Buffeting Simulation of a Simplified Car Model using PAM-FLOW
Lee, Dong-Guk ; Park, Il-Kyoo ; Lim, Jong-Yun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 198~204
DOI : 10.5050/KSNVE.2014.24.3.198
This paper presents a benchmark test result of an application of computational fluid dynamics(CFD) analysis of automotive sunroof buffeting simulation. Computational analyses of flow over an open sunroof of a simple vehicle model called as HAWT(Hyundai aeroacoustic wind tunnel) model were performed to study the buffeting phenomenon and to predict the buffeting noise level and its frequency. Computations are performed for sunroofs with PAM-FLOW software which is one of powerful CFD code of ESI group. Numerical predictions are compared with result from the tunnel test measurements. It is shown that CFD analysis has great potential for sunroof design and development by predicting buffeting noise.
Flow and Flow Noise Analysis of HSM by Using CAA++
Kim, Young Nam ; Chae, Jun Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 205~212
DOI : 10.5050/KSNVE.2014.24.3.205
In this paper, sunroof buffeting analysis for Hyundai simple model(HSM) is studied computationally. For validation, the velocity profile of boundary layer around the opening of HSM was obtained and compared with experimental results. The analysis of sunroof buffeting is done in two parts. First a steady state solution is obtained using the Reynolds Averaged Navier Stokes (RANS) solver, and then the computed flow field information is used as input for CAA++. Second transient simulation by CAA++ is performed for the peak sound pressure levels and peak frequencies of buffeting noise over the ranges of flow velocities. The benchmark results of frequency and sound pressure levels showed the general phenomena and matched well with the experimental data obtained by Hyundai Motor Car.
Numerical Analysis of Sunroof Buffeting using STAR-CCM+
Bonthu, Satish Kumar ; Mendonca, Fred ; Kim, Ghuiyeon ; Back, Young-R. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 213~218
DOI : 10.5050/KSNVE.2014.24.3.213
CFD flow simulation of vehicles with open sunroof and passenger window help the automotive OEM(original equipment manufacturer) to identify the low frequency noise levels in the cabin. The lock-in and lock-off phenomena observed in the experimental studies of sunroof buffeting is well predicted by CFD speed sweep calculations over the operating speed range of the vehicle. The trend of the shear layer oscillation frequency with vehicle speed is also well predicted. The peak SPL from the CFD calculation has a good compromise with the experimental value after incorporating the real world effects into the CFD model by means of artificial compressibility and damping correction. The entire process right from modeling to flow analysis as well as acoustic analysis has been performed within the single environment i.e., STAR-CCM+.
Development of the Bus Duct Installation System for Wind Tower
Rhee, Huinam ; Lee, Joon Keun ; Kim, Bong-Seok ; Park, Seong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 219~226
DOI : 10.5050/KSNVE.2013.24.3.219
A bus duct system for wind tower is introduced. A marine cable has been widely used in wind tower or various offshore structures. However, as the electric load capacity is increases, large number of cable lines must be used to cover the huge amount of electric capacities. Therefore, the installation of the cable lines becomes very difficult due to the heavy weight and volume of the cables. On the other hand, by using a single bus duct system line, the power capacity amount of 16 cables can be delivered with significantly compacted form. However, unlike flexible cables, the bus duct is relatively stiff which could generate the resonance phenomenon in the operating condition of the wind tower. In this study, the vibration characteristics of the bus duct are investigated and its long-term reliability during the life time of the wind tower is verified.
Seismic Design for Application of LNG Storage Tank Isolation System
Seo, Ki-Young ; Park, Hyun-Jae ; Kim, Nam-Sik ; Kim, Jae-Min ; Yang, Seong-Yeong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 227~235
DOI : 10.5050/KSNVE.2013.24.3.227
The demand of natural gas is gradually increasing as a clean fuel in the world. Therefore, LNG storage tanks and related facilities of the importance of leading a community-based facility have emerged. The seismic design of LNG storage tank including seismic analysis have been developed steadily. But, the seismic analysis and design techniques for LNG storage tanks are lacking, in Korea. Consequently, it is necessary to develop an analysis model that LNG storage tanks in isolation system can describe the behavior. Further, LNG storage tank capable of ensuring safety and economy, it is necessary to develop design techniques. The studies have suggested seismic design procedures of LNG storage tanks with isolation system including triple-FPB and idealized complex hysteresis model of triple-FPB.
Hybrid Rubber Mount by Using Magnetic Force
Ahn, Young Kong ; Kim, Dong-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 236~246
DOI : 10.5050/KSNVE.2013.24.3.236
This paper presents a hybrid rubber mount with magnet to isolate effectively the vibration in vehicle, forklift, and so on. The hybrid mount does not have any controller of the magnetic force. Dynamic stiffness of the mount is reduced by only magnetic suction according to the applied magnetic field and damping coefficient increased. Performance of conventional rubber mount with using electromagnet has been investigated by MTS Tester. The governing equation of the hybrid mount was derived and verified by comparison with experimental and theoretical results. The equation can be used practically and usefully in the design of the mount and analysis of the mounting system. The hybrid mount provides excellent performance in vibration isolation and its structure is very simpler than active with controller and a semi-active mount with a functional fluid. Furthermore, production cost of the mount using permanent magnets is very lower than that of the active mount with electromagnets. Therefore, commercial potential of the mount is very high.
Development of Novel Impact Paint Sensor by Using Graphene based Smart Nano Composite
Kim, Sung Yong ; Park, Sehoon ; Choi, Gyoung Rak ; Park, Hyung-Ki ; Kang, Inpil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 247~252
DOI : 10.5050/KSNVE.2013.24.3.247
This paper presents a novel impact sensor which can be fabricated with smart paint made of grapheme. This smart nano paint can be easily installed on structures using a spray-on technique and that can make the sensor low cost and practical. The graphene effectively improves the piezoresistivity of the smart paint and that is available to achieve sensitive impact sensor with high gauge factor. The nano smart-paint can detect sufficient impact to cover the damaged energy range of the composite around 1~3J. The voltage outputs from the sprayed paints show fairly linear responses after signal processing. The impact makes deformation of the structure and it brings change of piezoresistivity of the paint and those converts into voltage output consequently by means of a simple signal processing system. The nano smart paint is lightweight and easily applied to the structural surface, and there is no stress concentration. The nano smart paint is expected to be a cost effective and sensitive multi-functional sensor for composites and other damage monitoring applications in the field of structural health monitoring.
Evaluation of Interior Sounds of High-speed Trains Considering the Condition of Tunnel Running
Kim, Jae Ho ; Kim, Ho Jun ; Jeon, Jin Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 253~260
DOI : 10.5050/KSNVE.2013.24.3.253
conducted. In-situ measurements were conducted to investigate the noise characteristics in high-speed trains such as KTX and KTX-Sancheon. Binaural microphones and spherical microphone were adopted to record and evaluate the spectral characteristics and noise incidence characteristics at the seats in the passenger cars. Environmental elements were also recorded during the noise measurements using a camcorder and GPS application. In addition, auditory tests were conducted to investigate annoyance of interior noise of high-speed trains. Based on the objective measure and subjective responses on interior noise, statistical analysis such as correlation and regression analyses were carried out. From the results perception models for evaluating the interior noise of high-speed train were derived.
Free Vibrations of Cylindrical Shells on Inclined Partial Elastic Foundation
Park, Kyung-Jo ; Kim, Young-Wann ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 3, 2014, Pages 261~267
DOI : 10.5050/KSNVE.2013.24.3.261
The free vibration characteristics of cylindrical shells on inclined partial elastic foundations are investigated by an analytical method. The cylindrical shell is partially surrounded by the elastic foundations, these are represented by the Winkler or Pasternak model. The area of elastic foundation is not uniform and varies along the axial direction of the shell. The motion of shell is represented by first-order shear deformation theory(FSDT) to account for rotary inertia and transverse shear strains. The governing equation is obtained using the Rayleigh-Ritz method and a variation approach. To validate the present method, the numerical example is presented and compared with the present FEA results. The numerical results reveal that the elastic foundation has significant effect on vibration characteristics.