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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 21, Issue 12 - Dec 2011
Volume 21, Issue 11 - Nov 2011
Volume 21, Issue 10 - Oct 2011
Volume 21, Issue 9 - Sep 2011
Volume 21, Issue 8 - Aug 2011
Volume 21, Issue 7 - Jul 2011
Volume 21, Issue 6 - Jun 2011
Volume 21, Issue 5 - May 2011
Volume 21, Issue 4 - Apr 2011
Volume 21, Issue 3 - Mar 2011
Volume 21, Issue 2 - Feb 2011
Volume 21, Issue 1 - Jan 2011
Selecting the target year
Framework Development for Fault Prediction in Hot Rolling Mill System
Son, J.D. ; Yang, B.S. ; Park, S.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 199~205
DOI : 10.5050/KSNVE.2011.21.3.199
This paper proposes a framework to predict the mechanical fault of hot rolling mill system (HRMS). The optimum process of HRMS is usually identified by the rotating velocity of working roll. Therefore, observing the velocity of working roll is relevant to early know the HRMS condition. In this paper, we propose the framework which consists of two methods namely spectrum matrix which related to case-based fast Fourier transform(FFT) analysis, and three dimensional condition monitoring based on novel visualization. Validation of the proposed method has been conducted using vibration data acquired from HRMS by accelerometer sensors. The acquired data was also tested by developed software referred as hot rolling mill facility analysis module. The result is plausible and promising, and the developed software will be enhanced to be capable in prediction of remaining useful life of HRMS.
Wireless Gap Sensor Based on Surface Acoustic Wave Device
Kim, Jae-Geun ; Park, Kyoung-Soo ; Park, No-Cheol ; Park, Young-Pil ; Lee, Taek-Joo ; Lim, Soo-Cheol ; Ohm, Won-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 206~211
DOI : 10.5050/KSNVE.2011.21.3.206
In this paper, we report a high-precision wireless gap sensor based on a surface acoustic wave (SAW) device. The sensing element is a parallel-plate capacitor whose dimensions are
, and is attached to the SAW device as an external load. The SAW device, equipped with an RF antenna, serves simultaneously as a signal conditioner and an RF transponder. The center frequency of the SAW device is 450 MHz. The wireless gap sensor prototype exhibits a resolution of 100 nm and a sensing range of
. The proposed sensor system can be used for remote, high-precision gap measurement in hard-to-reach environments.
Intrusion Detection Based on the Sound Field Variation of Audible Frequency Band
Lee, Sung-Q ; Park, Kang-Ho ; Yang, Woo-Seok ; Kim, Jong-Dae ; Kim, Dae-Sung ; Kim, Ki-Hyun ; Wang, Se-Myung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 212~219
DOI : 10.5050/KSNVE.2011.21.3.212
In this paper, intrusion detection technique based on the sound field variation of audio frequency in the security space is proposed. The sound field formed by sound source can be detected with the microphone when the obstacle or intruder is positioned. The sound field variation due to the intruder is mainly caused by the interference of audio wave. With the help of numerical simulation of sound field formations, the increase or decrease of sound pressure level is analyzed not only by the obstacle, but also by the intruder. Even the microphone is positioned behind the source, sound pressure level can be increased or decreased due to the interference of sound wave. Frequency response test is performed with Gaussian white noise signal to get the whole frequency response from 0 to half of sampling frequency. There are three security cases. Case 1 is the situation of empty space with and without intruder, case 2 is the situation of blocking obstacle with and without intruder, and case 3 is the situation of side blocking obstacle with and without intruder. At each case, the frequency response is obtained first at the security space without intruder, and second with intruder. From the experiment, intruder size of diameter of 50 cm pillar can be successfully detected with the proposed technique. Moreover, the case 2 and case 3 bring about bigger sound field variation. It means that the proposed technique have the potential of more credible security guarantee in real situation.
Source Location of Multiple Impacts on the Plate Based on Pre-signal Processing
Moon, Yoo-Sung ; Park, Hong-Sug ; Lee, Sang-Kwon ; Shin, Ki-Hong ; Lee, Yung-Sup ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 220~226
DOI : 10.5050/KSNVE.2011.21.3.220
This paper presents the novel work for source localization of serial multiple impacts in a plate sructure. It is difficult to identify the source of serial multiple impacts with the current source localization techenology(SLT) because of the overlapping of dispersive wave induced by multiple impacts and the reflaction from the edge of the plate. In this paper, the new method is suggested for source localization. The method is developed based on the SLT with pre-signal processing such as some limitation for the selection of three sensors, the frequency range for TFA and impact time interval. Results from numerical simulation and experiment in isotropic plate structure are presented, which show the capability of the proposed method.
Basic Experiment for Lamb Wave Focusing by Phased Magnetostrictive Transducers in a Plate
Lee, Joo-Kyung ; Kim, Hoe-Woong ; Lee, Ho-Cheol ; Kim, Yoon-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 227~233
DOI : 10.5050/KSNVE.2011.21.3.227
The ultrasonic guided wave phased array using magnetostrictive patch transducers is proposed. The magnetostrictive transducer has received much attention because it is cost-effective and capable to generate ultrasonic waves with a simple configuration. However, it has not been used for ultrasonic guided wave phased array applications until now. In this paper, we propose a magnetostrictive transducer based phased array system consisting of a multi-channel function generator, power amplifiers and Lamb wave magnetostrictive transducers. To check the performance of the ultrasonic guided wave phased array, several Lamb wave focusing experiments were carried out in an aluminum plate. The results demonstrated the capability of the developed array to focus the Lamb waves at specific target points.
Exact Solution for Resistance Capacity utilizing Bingham Model of MR Dampers under Collapse Load
Seong, Ji-Young ; Min, Kyung-Won ; Kim, Jin-Koo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 234~240
DOI : 10.5050/KSNVE.2011.21.3.234
This study deals with progressive collapse of a structure retrofitted with MR dampers. In order to assess their effect of mitigation which prevents progressive collapse, control force ratio is defined by friction force of MR dampers divided by external force. First, simple model of a structure with MR dampers is suggested. Using the model, exact solution with the control force ratio is obtained. When and where the system is stopped is predicted by the derived solution. Through the dissipated energy by MR dampers during collapse event, equivalent damping ratio is derived. Finally, comparison of exact and equivalent solutions is presented.
A Study on Optimal Sensor Placement Using Sensitivity Analysis
Son, In-Soo ; Lee, Doo-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 241~247
DOI : 10.5050/KSNVE.2011.21.3.241
Although intensive development continues on innovative sensor systems, there is still considerable uncertainty in deciding on the number of sensors required and their locations in order to obtain adequate information on structural behavior. This paper is concerned with the sensor locations on a beam-structure for prognostic structural health monitoring. The purpose of this study is to investigate how to determine optimal sensor placement(OSP) from the sensitivity information of a known failure mode. The sensitivity of the forced vibration response of a beam to the variation of stiffness due to a crack is calculated analytically and used to determine the optimal sensor locations for the specified failure mode. The results of this method compared with the results of different OSP methods. The results have shown that the proposed method on optimal sensor placement is very effective in structural health monitoring.
Modelling of Railway Tracks for Wave Propagation along Railway Tracks at High Frequencies
Ryue, Jung-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 248~257
DOI : 10.5050/KSNVE.2011.21.3.248
It was reported recently that railpads can be included as a continuous elastic support of the rail and the model was justified from experiments. In general, however, railpads are installed discretely on sleepers with a regular span. The effect of the discrete railpad was not clearly examined so far in such a high frequency range. In this paper, the effect of the railpads in track modelling for high frequencies is investigated by means of the finite element analysis. To do that, the railpads are regarded as 'a continuous elastic support' and 'a discrete elastic support' in this paper. The dispersion relations and decaying features are predicted and compared between the two models up to 80 kHz.
Characteristics of Rotational Vibration of Cutting Edge in Elliptical Vibration Cutting by Modulation of Excitation Frequency
Loh, Byoung-Gook ; Kim, Gi-Dae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 258~263
DOI : 10.5050/KSNVE.2011.21.3.258
The direction of the cutting tool plays a critical role in elliptical vibration cutting(EVC) where the cutting tool cuts workpiece in a trochoidal motion. In this study, EVC cutting device was developed using two parallel piezoelectric materials and it was observed that the rotation direction of the tool reverses as the EVC device undergoes resonance at which either flexural(cutting direction) or longitudinal( thrust direction) mode shapes occurs. To analytically explain reversal of the rotation direction, kinematic motion analysis of the tool was modified to incorporate amplification of the vibration amplitude and phase introduced by resonance. It successfully demonstrated, through Matlab simulation, reversal of the rotation direction of the cutting tool as the excitation frequency increases beyond resonance frequencies at which either flexural or longitudinal vibration occurs.
Dynamic Response of a Beam Structure with Discrete Supports Subjected to a Moving Mass
Oh, B.J. ; Ryu, B.J. ; Lee, G.S. ; Lee, Y.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 264~270
DOI : 10.5050/KSNVE.2011.21.3.264
This paper deals with dynamic response of a beam structure with discrete spring-damper supports under a moving mass. Governing equations of motion taking into account of all inertia effects of the moving mass were derived by Galerkin's mode summation method, and Runge-Kutta integration method was applied to solve the differential equations. The effects of the speed of the moving mass, spring stiffness, damping coefficient, span number of a beam structure, mass ratio of the moving mass on the dynamic response of the beam structure have been studied. Some numerical results provide design engineers for the beam structure design with discrete supports under a moving mass.
Dynamic Analysis of the Beam Subjected to the Axial Load and Moving Mass
Lee, Kyu-Ho ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 271~279
DOI : 10.5050/KSNVE.2011.21.3.271
In this study, the dynamic analysis of a beam is analyzed by using the finite element method when the beam has moving mass and axial load. To consider the contact force between the moving mass and beam, coupled nonlinear equations of contact dynamics are derived, and then the weak form for the finite element method is established. The finite element computer programs based on the Lagrange multiplier method are developed to compute the contact force. Furthermore, a variety of simulations are performed for various design parameters such as moving mass velocity, compressive axial load and tension load. Finally, relations between the dynamic response and contact force are also discussed.
Performance Evaluation of Explosive Specific Bio-receptor Using QCM Sensing Platform for Resonance Frequency Shift Detection
Lim, Si-Hyung ; Jeong, Hyun-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 3, 2011, Pages 280~284
DOI : 10.5050/KSNVE.2011.21.3.280
The mass change during the molecular interaction between explosive specific bio-receptors and target molecules has been measured using quartz crystal microbalance(QCM), which has a mass change detection limit up to ~ng/
. The environmental effect on the molecular interaction has been evaluated. In the liquid phase molecular interaction experiments, the high selectivity of the bio-receptor to DNT compared with toluene has been shown and the sensitivity for various concentrations of DNT has been demonstrated.