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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
Analysis of the Vibration Characteristic for the Mine Detectable Test Platform
Chang, YuShin ; Kwak, NoJin ; Han, SeungHoon ; Ji, UnHo ; Ji, ChangJin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 927~934
DOI : 10.5050/KSNVE.2014.24.12.927
In this paper, analysis of the vibration characteristic for the mine detectable test platform is described. The test platform system is the multi-sensor mine detectable vehicle. This multi-sensor mine detectable unit is more efficient detection performance than other conventional methods. The test platform system has five subsystems, the UWB(ultra wide band) sensor scanner, the MD(metal detector) sensor scanner, the ND(neutron detector) sensor scanner, and the detectable vehicle. We perform the vibration tests for the test platform and analyze the vibration characteristic, such as the max displacement, the max deformation and the max Von-Misses stress.
Analysis of the Cause of Hindrance for Ride Quality with OPAX and OTPA
Kim, Jongsik ; Sin, Kwangsoo ; Choi, Sangil ; Im, Sebin ; Kim, Jindong ; Lee, Sangkwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 935~942
DOI : 10.5050/KSNVE.2014.24.12.935
The ride quality investigation is on-going topic in the car industry since its global standard has not evaluated and it is difficult to point out one part that hinders the ride quality. Since the traditional transfer path analysis that is widely used in car industry to investigate the ride quality requires a lot of test time to process the full data so that there are problems to conduct in industry. Based on these disadvantages, new approaches have developed such as OPAX(operational path analysis with eXogeneous inputs) and OTPA(operational transfer path analysis) for last decades. The OTPA only requires the operational data for evaluate the contribution of vibration sources and the OPAX has advantage of using parametric model to estimate the operating load and needs a minimum set of extra tests with excitation. In this paper, for evaluating the hindrance of ride quality two methods are used and the result is compared with another result of a car having higher ride quality.
A Numerical Study on the Simultaneous Identification of Excitation Force and Restoring Characteristic in Linear Forced Oscillation System
Jang, Taek Soo ; Park, Jinsoo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 943~947
DOI : 10.5050/KSNVE.2014.24.12.943
Recently, a new method for reconstructing a forced nonlinear dynamic system has been proposed; specifically, the simultaneous reconstruction of its excitation as well as restoring characteristics of the system. The reconstruction was just theoretically shown to be possible by measuring the system's responses, based on newly introduced notions, a J-function and a zero-crossing time. However, numerically in the current paper, we are to reconstruct a linear system, i.e., we focus on numerical experiments to reconstruct both the excitation and the linear restoring characteristic of a linear forced oscillating system by using response data, based on the J-function and the zero-crossing time.
Free Vibration Analysis of 'ㄱ' Type Wall Structure using Polynomials having the Property of a Simple and Fixed Support Euler Beam Functions
Yoon, DuckYoung ; Park, Jeonghee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 948~953
DOI : 10.5050/KSNVE.2014.24.12.948
Many studies using the assumed mode method have been found for the free vibration analysis of stiffened plate with known elastic boundary conditions. However many local structures such as tank edges and equipment foundations consist of connected structures and it is very difficult to find suitable elastic boundary conditions. In this study combined polynomials which satisfy simply and fixedly supported boundary conditions are proposed. The proposed method has been applied to tanks which bounded by bulkhead and a deck. The results of this study shows good agreements with these obtain by the FEA S/W(Patran/Nastran).
Analysis of Natural Frequencies and Squeal Noise of KTX Brake Unit
Goo, ByeongChoon ; Na, InKyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 954~961
DOI : 10.5050/KSNVE.2014.24.12.954
Brake squeal noise of KTX is very uncomfortable to passengers and workers in stations. A lot of study has been conducted to inquire into the mechanism of the squeal noise. But understanding of the brake squeal noise is still challenging. In this study, we developed a full-scale tester equipped with a KTX mechanical brake unit. And we measured the vibrational characteristics of each component of the brake unit and compared them with frequency response functions of brake squeal noise measured also in the tester. It was found that the brake squeal noise was more closely related to the vibrational characteristics of the brake pads and hangers in friction condition than those of free components.
Investigation Into Aeolian Tone Noise by Twin Tandem Square Cylinders in duct Using Lattice Boltzmann Method
Lee, Songjune ; Cheong, Cheolung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 962~968
DOI : 10.5050/KSNVE.2014.24.12.962
The lattice Boltzmann method(LBM) has attracted attention as an alternative numerical algorithm for solving fluid mechanics since the end of the 90's. In these days, its intrinsic unsteadiness and rapid increase in computing power make the LBM be more applicable for computing flow-induced noise as well as fluid dynamics. The lattice Boltzmann method is a weakly compressible scheme, so we can get information about both aerodynamics and aeroacoustics from single simulation. In this paper, numerical analysis on Aeolian tone noise generated by tandem-twin square cylinders in duct is performed using the LBM. For simplicity, laminar two-dimensional fluid models are used. To verify the validity and accuracy of the current numerical techniques, numerical results for the laminar duct and the cylinder flows are compared with the analytical solution and the measurement, respectively. Then, aerodynamic noise of the twin tandem square cylinders is investigated. It is shown that the aerodynamic noise from the twin tandem square cylinders can be reduced by controlling the distance between the cylinders.
Error Investigation in use of Near-field Acoustic Holography in the Underwater Environment of Reflected Wave
Yi, Jongju ; Kang, Myunghwan ; Han, Seungjin ; Jeong, Hyunjoo ; Bae, Sooryong ; Jung, Woojin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 969~976
DOI : 10.5050/KSNVE.2014.24.12.969
Nowadays, it is required for naval ships to estimate 3D underwater radiated noise pattern in all direction at peak frequencies of hull vibration for the reduction of being detected and doing the effective operation. For this purpose, the numerical method has to be developed to calculate 3D underwater radiated noise pattern with experimental data. It is very difficult to obtain the experimental data for the real ship. Alternative to get the experimental results is to use NAH(near-field acoustic holography) in acoustic tank with experimental model. Application of NAH in acoustic tank for the experimental model needs some investigation of reflection wave from the wall of the acoustic tank and unmeasured zone of the experimental model due to the supporting structure for it. In this study, the effect of reflection wave in the acoustic tank and unmeasured area of the experimental model when using the NAH was investigated with experiment and numerical model. From these, it is known for the error due to reflection wave can be reduced when the distance between the measurement plane and source is being shorten. Also, unmeasured area of the experimental model gives rise to some error in the estimation of the far-field acoustic pressure.
Trend of Toxic Nanomaterial Detecting Sensors
Jang, Kuewhan ; Na, Sungsoo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 977~984
DOI : 10.5050/KSNVE.2014.24.12.977
Nanomaterial have grown from scientific interest to commercial products and the nanomaterial market has grown 19.1 % each year. As the nanomaterial market size increases, it is expected that nanomaterial production will increase and its contamination of outdoor environmental system will also increase in the form of industrial waste. Since most of nanomaterials are known as biologically non-degradable materials, nanomaterials will accumulate in the environment, and this will increase the potential threats to human health along the food chain. Recent studies have investigated the toxicity effect of nanomaterials due to their size, chemical composition and shape. For the development of nanomaterial while taking human health into consideration, a nanomaterial detecting sensor is required. In this paper, we have observed the trend of nanomaterial detecting sensor of mechanical, electrochemical, optical and kelvin probe force microscopy sensors and we believe that this trend will shed the light on the development of real-life nanomaterial detecting sensors.
Extraction of Three-dimensional Hybrid City Model based on Airborne LiDAR and GIS Data for Transportation Noise Mapping
Park, Taeho ; Chun, Bumseok ; Chang, Seo Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 985~991
DOI : 10.5050/KSNVE.2014.24.12.985
The combined method utilizing airborne LiDAR and GIS data is suggested to extract 3-dimensional hybrid city model including roads and buildings. Combining the two types of data is more efficient to estimate the elevations of various types of roads and buildings than using either LiDAR or GIS data only. This method is particularly useful to model the overlapped roads around the so called spaghetti junction. The preliminary model is constructed from the LiDAR data, which can give wrong information around the overlapped parts. And then, the erratic vertex points are detected by imposing maximum vertical grade allowable on the elevated roads. For the purpose of efficiency, the erratic vertex points are corrected through linear interpolation method. To avoid the erratic treatment of the LiDAR data on the facades of buildings 2 meter inner-buffer zone is proposed to efficiently estimate the height of a building. It is validated by the mean value(=5.26 %) of differences between estimated elevations on 2 m inner buffer zone and randomly observed building elevations.
Analysis of the Acoustic Radiation Efficiency on Multi-excitation System with Different Phase
Kang, Myunghwan ; Yi, Jongju ; Han, Seungjin ; Bae, Sooryong ; Jung, Woojin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 992~998
DOI : 10.5050/KSNVE.2014.24.12.992
Acoustic radiation efficiency is one of the important factors in the prediction of underwater radiated noise of ships. A ship has much equipment to operate successful mission in a ship. Most of equipment is running simultaneously as multi-excitation and becomes the source of underwater radiated noise. In many cases of multi-excitation, phase difference between multi-excitation is not considered. Because vibration response under multi-excitation is the vector sum of each single excitation, acoustic radiation efficiency based on surface velocity field can be affected by phase of excitation. In this study, acoustic radiation efficiency of a plate on air and a stiffened cylindrical model in water under multi-excitation with phase difference is investigated.
Wave Transmission Analysis of Semi-infinite Mindlin Plates Coupled at an Arbitrary Angle
Park, Young-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 12, 2014, Pages 999~1006
DOI : 10.5050/KSNVE.2014.24.12.999
Mindlin plate theory includes the shear deformation and rotatory inertia effects which cannot be negligible as exciting frequency increases. The statistical methods such as energy flow analysis(EFA) and statistical energy analysis(SEA) are very useful for estimation of structure-borne sound of various built-up structures. For the reliable vibrational analysis of built-up structures at high frequencies, the energy transfer relationship between out-of-plane waves and in-plane waves exist in Mindlin plates coupled at arbitrary angles must be derived. In this paper, the new wave transmission analysis is successfully performed for various energy analyses of Mindlin plates coupled at arbitrary angles.