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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 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
Vibration Suppression of a Cantilever Beam Using MTMD
Bae, Jae-Sung ; Hwang, Jai-Hyuk ; Kim, Jong-Hyuk ; Lim, Jae-Hyuk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1091~1097
DOI : 10.5050/KSNVE.2011.21.12.1091
In the present study, TMD(tuned mass damper) with eddy current damping is proposed to suppress the vibration of a cantilever beam effectively. The advantages of TMD are that it is simple and its performance are excellent at any particular frequency. However, TMD may have the low performance at other frequency. To solve this problem and improve its performance, this study applies the eddy current damping to TMD. This TMD with ECD is named as MTMD(magnetically tuned mass damper). MTMD is designed for the vibration suppression of a cantilever beam. The mathematical modeling, simulation, and experiments of the cantilever beam with MTMD are performed. From analytic and experimental results, it can be concluded that the vibration suppression performance of MTMD are excellent.
Vibration and Stress Analysis for Reactor Vessel Internals of Advanced Power Reactor 1400 by Pulsation of Reactor Coolant Pump
Kim, Kyu-Hyung ; Ko, Do-Young ; Kim, Sung-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1098~1103
DOI : 10.5050/KSNVE.2011.21.12.1098
The structural integrity of APR1400 reactor vessel internals has been being assessed referring the US Nuclear Regulatory Commission regulatory guide 1.20, comprehensive vibration assessment program. The program is composed of a vibration and stress analysis, a vibration and stress measurement, and an inspection. This paper covers the vibration and stress analysis on the reactor vessel internals by the pulsation of reactor coolant pump. 3-dimensional models to calculate the hydraulic loads and structural responses were built and the pressure distributions and the structural responses were predicted using ANSYS. This paper presents that APR1400 reactor vessel internals have enough structural integrity against the pulsation of reactor coolant pump as the peak stress of the reactor vessel internals is much lower than the acceptance limit.
Reduction of Sound Radiated Power of Clamped Beams using Filtered Velocity Feedback Controllers
Shin, Chang-Joo ; Hong, Chin-Suk ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1104~1111
DOI : 10.5050/KSNVE.2011.21.12.1104
This paper investigates the filtered velocity feedback(FVF) controller for the reduction of the acoustic power radiated from a clamped beam. The instability problem due to the non-collocated sensor/actuator configuration when using PZT actuator should be sorted out. The roll-off property of the FVF controller at high frequency helps to alleviate the instability. The dynamics of clamped beams under forces and moments pair and the FVF controller are first formulated. The formulation of the sound radiated power is followed. The open loop transfer function(OLTF) synthesized with 100 modes is used to determine the stability of the control system. The control performance is finally estimated. The levels of the vibration and the sound radiated power are reduced in the wide bandbelow the tuning mode of the FVF controller.
Analytical Evaluation of Rotor Dynamic Characteristic of Roots Type Vacuum Pump
Lee, Jong-Myeong ; Kim, Yong-Hwi ; Ha, Jeong-Min ; Gu, Dong-Sik ; Choi, Byeong-Keun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1112~1119
DOI : 10.5050/KSNVE.2011.21.12.1112
The goal of this study is the stability evaluation of a vacuum pump through modal test and rotor dynamics. Roots type vacuum pump, which is a dry vacuum pump, is necessary for the manufacturing process of the semiconductor and the display. Eigenvalue was solved by the finite-element method(FEM) using 2D and 3D models, then the modal test result was compared with the FEM result. According to the comparison, the analysis result using the 2D was more accurate than the 3D model. Therefore, rotor dynamics was performed by the 2D model. Campbell diagram and root-locus maps, which were calculated by complex-eigenvalue analysis, were used to evaluate the stability of the rotors of the vacuum pump. And displacement solved by unbalance response analysis was compared with the minimum clearance between two rotors of the vacuum pump. Thus, the vacuum pump is assumed operated under steady state through the evaluation of the rotor dynamics.
Investigating the Spatial Focusing Performance of Time Reversal Lamb Waves on a Plate through the Finite Element Method
Choi, Jeong-Hee ; Lee, Hae-Sung ; Park, Hyun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1120~1131
DOI : 10.5050/KSNVE.2011.21.12.1120
Researches using time reversal acoustics(TRA) for impact localization have been paid attention to recently. Dispersion characteristics of Lamb waves, which restrict the utility of classical nondestructive evaluation based on time-of-flight information, can be compensated through the application of TRA to Lamb waves on a plate. This study investigates the spatial focusing performance of time reversal Lamb waves on a plate using finite element analysis. In particular, the virtual sensor effect caused by multiple wave reflections at the boundaries of a plate is shown to enable the spatial focusing of Lamb waves though a very small number of surface-bonded piezoelectric(PZT) sensors are available. The time window size of forward response signals, are normalized with respect to the number of virtual active sensors. Then their effects on the spatial focusing performance of Lamb waves are investigated.
The Variation Rate of Shear Modulus for Anisotropic Magneto-rheological Elastomer due to Volume Fraction of CIP
Jeong, Un-Chang ; Yoon, Ji-Hyun ; Yang, In-Hyung ; Lee, You-Yub ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1132~1137
DOI : 10.5050/KSNVE.2011.21.12.1132
MRE(magneto-rheological elastomers) is a material which shows reversible and various modulus in magnetic field. Comparing to conventional rubber vibration isolator, MREs are able to absorb vibration of broader frequency range. These characteristic phenomena result from the orientation of magnetic particles named carbonyl iron powder(CIP) in rubber matrix. In this paper, simulation on variation rate of shear modulus for anisotropic MRE due to volume fraction of CIP and an effective permeability model was applied to predict the field-induced shear modulus of MREs. Also, the variation rate of shear modulus for anisotropic MRE was derived using magneto-mechanical theory. Based on Maxwell-Garnett mixing rule, the increment of shear modulus was calculated to evaluate the shear modulus of MREs with column structure of CIP due to induced current. The simulation results on variation rate of shear modulus can be applied to the variable mechanical system of MRE such as tunable vibration absorber, stiffness variable bush and mount.
Prediction of Internal Broadband Noise of a Centrifugal Fan Using Stochastic Turbulent Synthetic Model
Heo, Seung ; Kim, Dae-Hwan ; Cheong, Cheol-Ung ; Kim, Tae-Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1138~1145
DOI : 10.5050/KSNVE.2011.21.12.1138
The internal broadband noise of a centrifugal fan in a household refrigerator is predicted using hybrid CAA techniques based on stochastic turbulent synthetic model. First, the unsteady flow field around the centrifugal fan is predicted using computational fluid dynamics(CFD) method. Then, the turbulent flow field is synthesized by applying the stochastic turbulent synthetic technique to the predicted flow field. The aerodynamic noise sources of the centrifugal fan are modeled on a basis of the synthesized turbulent field. Finally, the internal broadband noise of the centrifugal fan is predicted using the boundary element method(BEM) and the modeled sources. The predicted noise spectrum is compared with the experimental data. It is found that the predicted result closely follows the experimental data. The proposed method can be used as an effective tool for designing low-noise fans without expensive computational cost required generally for the LES and DNS simulations to resolve the turbulence flow field responsible for the broadband noise.
Acoustic Analysis in the Payload Fairing of Launch Vehicle
Seo, Sang-Hyeon ; Park, Soon-Hong ; Jeong, Ho-Kyeong ; Jang, Young-Soon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1146~1151
DOI : 10.5050/KSNVE.2011.21.12.1146
Acoustic load from rocket propulsion system is main source of random vibration working on the payload. To protect payload from this acoustic load, additional APS(acoustic protection system) is generally applied. Noise reduction capacity of APS can be verified through acoustic test and vibro-acoustic coupled analysis. This paper compared the results of acoustic test and vibro-acoustic coupled analysis about KSLV-I payload fairing with APS.
A Study on a Configuration of the Load Characteristic Evaluation Device Using Hydraulic Power for the Analysis of the Tilting Kinetic Mechanism
Lee, Jun-Ho ; Kim, Ho-Yeon ; Han, Seong-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1152~1158
DOI : 10.5050/KSNVE.2011.21.12.1152
In this paper a configuration of the load evaluation device for the tilting actuator using hydraulic power is presented, which makes it possible to measure the force action on the tilting actuator. It is possible to measure only current using the conventional electro-mechanical actuator when the bogie is in the process of the tilting. This makes impossible to measure the force acting on the tilting actuator. In order to overcome this problem a kinetic mechanism test system using hydraulic cylinder is proposed. The system are consisted of hydraulic cylinder for the tilting actuation, control system to control hydraulic power, sensors to measure for force and displacement and monitoring system for the user interface.
Ride Comfort Investigation of 1/4 MR Damper Vehicle under Different Tire Pressure
Maeng, Young-Jun ; Seong, Min-Sang ; Choi, Seung-Bok ; Kwon, Oh-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1159~1165
DOI : 10.5050/KSNVE.2011.21.12.1159
This paper presents ride comfort characteristics of a quarter-vehicle magneto-rheological(MR) suspension system with respect to different tire pressure. As a first step, controllable MR damper is designed and modeled based on both the optimized damping force levels and mechanical dimensions required for a commercial full-size passenger vehicle. Then, a quarter-vehicle suspension system consisting of sprung mass, spring, tire and the MR damper is constructed. After deriving the equations of the motion for the proposed quarter-vehicle MR suspension system, vertical tire stiffness with respect to different tire pressure is experimentally identified. The skyhook controller is then implemented for the realization of the quarter-vehicle MR suspension system. Finally, the ride comfort analysis with respect to different tire pressure is undertaken in time domain. In addition, a comparative result between controlled and uncontrolled is provided by presenting vertical RMS displacement.
Excitation Response Estimation of Polar Class Vessel Propulsion Shafting System
Barro, Ronald D. ; Lee, Don-Chool ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1166~1176
DOI : 10.5050/KSNVE.2011.21.12.1166
The prospect in opening the arctic trade transportation route on a year-round basis offers vast opportunity of exploring untapped resources and shortened navigational routes. In addition, the environment's remoteness and lack of technical experiences remains a big challenge for the maritime industry. With this, engine designers and makers are continually investigating, specifically optimizing propulsion shafting system design, to meet the environmental and technical challenges of the region. The International Association of Classification Society, specifically machinery requirements for polar class ships(IACS UR13), embodies the propulsion shafting design requirements for ice class vessels. However, the necessity to upgrade the various features of the unified rules in meeting current polar requirements is acknowledged by IACS and other classification societies. For the polar class propulsion shafting system, it is perceived that the main source of excitation will be the propeller - ice load interaction. The milling - and the impact load, in addition to the load cases interpreted by IACS, contribute greatly to the overall characteristic of the system and due considerations are given during the propulsion design stage. This paper will expound on the excitation load estimation factors affecting the dynamic response of the different propulsion shafting system design. It is anticipated that detailed understanding of these factors will have a significant role during propulsion shafting design in the future.
Comparison of Noise Abatement Policies in Advanced Countries and Korea
Kang, Dae-Joon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1177~1184
DOI : 10.5050/KSNVE.2011.21.12.1177
One of the main objectives of noise control act is to define and ensure application and respect of noise exposure limits. Most advanced countries have prepared a legal framework for noise limits either by national laws, ordinances or municipal by-laws. A large number of advaced countries have adopted the Leq index for the main sources of noise(road, railway, industry). The exception is aircraft noise for which regulatory practice is highly disparate. These differences in the indices adopted, the periods and areas to which regulations apply, definitions of measurement conditions and ways in which noise levels are calculated make it difficult to compare the current advanced countries standards. This study presents the current noise abatement policy of the advanced countries and proposes the improvement of the current noise abatement policy of Korea to catch up with it of the advanced countries.
Kinematical Characteristics of Vibration Assisted Cutting Device Constructed with Parallel Piezoelectric Stacked Actuators
Loh, Byoung-Gook ; Kim, Gi-Dae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1185~1191
DOI : 10.5050/KSNVE.2011.21.12.1185
The kinematic characteristics of cutting device significantly affects cutting performance in 2-dimensional elliptical vibration cutting(EVC) where the cutting tool cuts workpiece, traversing a micro-scale elliptical trajectory in a trochoidal motion. In this study, kinematical characteristics of EVC device constructed with two parallel stacked piezoelectric actuators were analytically modeled and compared with the experimental results. The EVC device was subjected to step and low-frequency(0.1 Hz) sinusoidal inputs to reveal only its kinematical displacement characteristics. Hysteresis in the motion of the device was observed in the thrust direction and distinctive skew of the major axis of the elliptical trajectory of the cutting tool was also noticed. Discrepancy in the voltage-to-displacement characteristics of the piezoelectric actuators was found to largely contribute to the skew of the major axis of the elliptical trajectory of the cutting tool. Analytical kinematical model predicted the cutting direction displacement within 10 % error in magnitude with no phase error, but in estimating the thrust direction displacement, it showed a
of phase-lag compared with the measured displacement with no magnitude error.
Design and Performance Evaluation of Spring-viscous Damper for Torsional Vibration
Lee, D.H. ; Chung, T.Y. ; Kim, Y.C. ; Kim, H.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1192~1198
DOI : 10.5050/KSNVE.2011.21.12.1192
Design routines of a torsional spring-viscous damper for a 1800 kW four cycle diesel engine-generator system are described. Modal techniques for system normalization and optimal equations for damper design are used to obtain proper design parameters of the damper. A prototype damper is manufactured according to the described design process and its two design parameters, stiffness and damping, are evaluated experimentally by torsional actuator test and free decay test. Experimentally obtained values of stiffness and damping coefficients showed good agreements with the designed values of the prototype damper.
Ride Quality Evaluation of Seat Suspension Adopting Controllable Damper
Han, Young-Min ; Min, Chul-Gi ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 12, 2011, Pages 1199~1205
DOI : 10.5050/KSNVE.2011.21.12.1199
In the present work, a seat suspension system adopting semi-active damper is evaluated for driver's ride quality. A cylindrical type of ER(electrorheological) damper is designed and manufactured for the seat suspension of heavy vehicles. The governing equation is derived under consideration of human vibration. A sliding mode controller is then synthesized and experimentally realized on the manufactured ER seat suspension while a driver is sitting on the controlled seat. Ride quality is evaluated by fatigue decreased proficiency boundary, vibration dose value and crest factor utilizing weighted-acceleration according to ISO2631.