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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
Nonlinear Dynamic Analysis of a Satellite with Tether Conveying Fluid
Jung, Won-Young ; Lee, Kyu-Ho ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 691~697
DOI : 10.5050/KSNVE.2011.21.8.691
The purpose of this study is to analyze nonlinear dynamics of a tethered satellite. The coupled non-linear equations of motion are derived by using the extended Hamilton's principle with the polar coordinate system. In order to analyze the response of tethered satellite, time responses are computed by the Newmark's time integration method. We also investigate the dynamic behavior of the system and the effects of length of tether, tip mass and conveyed fluid through the tether with time variation.
Dynamic Stability Analysis of Thick Plates with Varying Thickness and Concentrated Mass on Inhomogeneous Pasternak Foundation
Lee, Yong-Soo ; Kim, Il-Jung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 698~707
DOI : 10.5050/KSNVE.2011.21.8.698
This paper is to analyze the stability of the thick plate on inhomogeneous Pasternak foundation, with linearly varying thickness and concentrated mass by finite element method. To verify this finite element method, the results of natural frequencies and buckling stresses by the proposed method are compared with the existing solutions. The dynamic instability regions are decided by the dynamic stability analysis of the thick plate on inhomogeneous Pasternak foundation, with linearly varying thickness and concentrated mass. The non-dimensional Winkler foundation parameter is applied as 100, 1000 and non-dimensional shear foundation parameter is applied as 5. The tapered ratios are applied as 0.25 and 1.0, the ratios of concentrated mass to plate mass as 0.25 and 1.0, and the ratio of in-plane force to critical load as 0.4. As the result of numerical analysis of the thick plate on inhomogeneous Pasternak foundation for
, instability areas of the thick plate which has the larger rigidity of inner area are farther from
-axis and narrower than those which has the larger rigidity of outer area.
Selection Criteria of Measurement Locations for Advanced Power Reactor 1400 Reactor Vessel Internals Comprehensive Vibration Assessment Program
Ko, Do-Young ; Kim, Kyu-Hyung ; Kim, Sung-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 708~713
DOI : 10.5050/KSNVE.2011.21.8.708
U.S. nuclear regulatory commission(NRC) regulatory guide(RG) 1.20 requires a comprehensive vibration assessment program(CVAP) for use in verifying the structural integrity of reactor vessel internals(RVI) for flow-induced vibrations prior to commercial operation. The CVAP program consist of vibration and fatigue analysis, a vibration measurement program, an inspection program, and a correlation of their results. One of the main purposes of the analysis program is to select measurement locations, however measurement locations can not be determined by only analysis results, therefore we developed selection criteria of measurement locations for advanced power reactor 1400(APR1400) RVI CVAP, It will be used to select measurement locations and instrument types for APR1400 RVI CVAP.
A Study on the Vibration Characteristics of MR Elastomers Based on Silicon
Park, Jeong-Heon ; Lee, Chul-Hee ; Kim, Cheol-Hyun ; Cho, Won-Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 714~719
DOI : 10.5050/KSNVE.2011.21.8.714
This paper presents vibration characteristics of magnetorheological(MR) elastomer, whose elastic modulus are controllable by applied magnetic field. By using this property, the material can be applied to vibration absorber, so that the stiffness of the absorber can be changed and actively controlled according to the magnetic flux density. However, the various performances of MR elastomer depends on different polarized direction of particles by applied magnetic field and dimension during the manufacturing process. In this paper, in order to obtain the optimal characteristics of MR elastomer, MR elastomers with different types and dimensions are prepared for a series tests. Using this test setup, extent of natural frequency shifted against magnetic field at various excitation frequencies can be measured. Specimens are prepared with 3 types, as cylinder samples exposed to magnetic field vertically, horizontally and unexposed during cure, respectively. Also, a set of design variables are considered to produce MR elastomers. Through the modal tests of mass structure with MR elastomer, the optimal design as well as the polarization direction of MR elastomer is obtained among the various dimensions and 3 directional types of MR elastomers.
Design of a Ultrasonic Cutting-tool Utilizing Resonance Condition of Transverse Vibration of Beam Type Structure
Byun, Jin-Woo ; Han, Sang-Bo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 720~725
DOI : 10.5050/KSNVE.2011.21.8.720
Most ultrasonic vibration cutting tools are operated at the resonance condition of the longitudinal vibration of the structure consisting of booster, horn and bite. In this study, a transverse vibration tool with beam shape is designed to utilize the vibration characteristics of the beam. Design point of the transverse vibration tool is to match the resonance frequency of the bite to the frequency of the signal to excite the piezoelectric element in the booster. The design process to match the natural frequency of the longitudinal vibration mode of the horn and that of the transverse vibration mode of the bite is presented. Dimensions of the horn and bite are searched by trend analysis through which the standard shapes of the horn and bite are determined. After the dimensions of each component of the cutting tool consisting of booster, horn and bite are determined, the assembled structure was experimentally tested to verify that true resonant condition is achieved and proper vibrational displacement are obtained to ensure that enough cutting force is generated.
Noise Reduction of a Blower for an Automatic Car Washer by Using Dissipative Silencers
Kim, Jae-Young ; Lee, Il-Jae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 726~732
DOI : 10.5050/KSNVE.2011.21.8.726
Straight absorptive silencers have been designed to reduce the noise level of a centrifugal blower. Three-dimensional boundary element method is used for the design of absorptive silencers which consist of a perforated main pipe and a outer chamber filled with fibrous material. The experimental results show that the absorptive silencer reduces up to 8 dB(A) in the overall sound pressure level of the blower and up to 15 dB at the blade passing frequency. It is also found that the gap between the silencer and the impeller may substantially alter the acoustic performance of the silencers. The transmission loss predicted by the boundary element method follows overall trends of the measured insertion loss. The experiments also show that the impact of the silencers on the aerodynamic performance of the blower is minimum.
Prediction and Reduction of Transient Vibration of Piping System for a Rotary Compressor
Ryu, Sang-Mo ; Jeong, Weui-Bong ; Han, Hyung-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 733~740
DOI : 10.5050/KSNVE.2011.21.8.733
This paper deals with the process to identify the transient exciting force generated from a rotary compressor. The compressor was assumed to be a rigid body. The equation of motion of a rigid compressor supported by three mounts was derived with 6 degree-of-freedom. The exciting forces at the center of mass of the compressor were estimated from the acceleration data measured at compressor shell. Compressor-pipe system was modeled numerically. The accelerations of compressor and pipe were predicted numerically by using the estimated exciting force. A new shape of pipe model was proposed to reduce the vibration. In the prediction by the method in this paper, the maximum acceleration of the pipe could be reduced by 53.7 % at the steady-state and by 12 % at the transient process. In the real experiments, the maximum acceleration of the pipe was reduced by 54.2 % at steady-state and 14.7 % at the transient process. It was verified that the numerical results showed good agreement with experimental results.
Active Vibration Control Experiment on Automobile Using Active Vibration Absorber
Yang, Dong-Ho ; Kwak, Moon-K. ; Kim, Jung-Hoon ; Park, Woon-Hwan ; Oh, Sang-Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 741~751
DOI : 10.5050/KSNVE.2011.21.8.741
Vibrations caused by automobile engine are absorbed mostly by a passive-type engine mount. However, user specifications for automobile vibrations require more stringent conditions and higher standard. Hence, active-type engine mounts have been developed to cope with such specifications. In this study, the active vibration absorber which can be attached to the sub-frame of automobile is used for the suppression of vibrations caused by engine. The active vibration absorbing system consists of sensor, actuator and controller where a control algorithm is implemented using DSP. The vibration caused by engine reveals harmonic disturbances varying with engine revolution. Therefore, the control algorithm should be able to cope with harmonic disturbances. In this study, the modified higher harmonic control technique which can selectively suppress harmonic disturbance is considered. Experimental results on automobile show that the proposed active vibration absorbing system is effective in suppressing vibrations caused by engine.
Effects of Design Conditions in Five Pad Tilting Pad Bearing on the Lateral Vibration Characteristics of Small Gas Turbine
Ha, Jin-Woong ; Myung, Ji-Ho ; Suk, Jhin-Ik ; Lee, An-Sung ; Kim, Young-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 752~760
DOI : 10.5050/KSNVE.2011.21.8.752
In tilting pad bearing design process, the selection of the proper configuration type of either a load-between-pad(LBP) or load-on-pad(LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a five pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5 MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by its asymmetric dynamic properties.
Development of a Framework for Improving Efficiency of Ship Vibration Analysis
Cho, Dae-Seung ; Kim, Jin-Hyeong ; Choi, Tae-Muk ; Kim, Kyung-Soo ; Choi, Sung-Won ; Jung, Tae-Seok ; Lee, Do-Kyung ; Seok, Ho-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 761~767
DOI : 10.5050/KSNVE.2011.21.8.761
Free and forced vibration analysis of the global ship structure using the 3-dimensional finite element(FE) method requires not only the specialized knowledge such as ship structure interacted with fluid, damping and various excitations due to propulsion system but also time-consuming manual tasks in FE modeling, analysis and response evaluation. As a result, the quality of the vibration analysis highly depends on engineer's expertise and experience. In this study, a framework system to improve the efficiency of global ship vibration analysis is introduced. The system promising the utilization of MSC/Patran and MSC/Nastran consists of various modules to support data management, FE modeling of ship structure and loading, input deck generation for free and forced vibration analysis, data extraction and evaluation of analysis results, and databases for FE models of marine diesel engines and vibration criteria. The system may be useful for pursuing standardization of uncertain analysis factors as well as reducing time, cost and human dependency in ship vibration analysis.
Evaluation of Vibration Control Performance for Active Hybrid Mount System Featuring Inertial Actuator
Oh, Jong-Seok ; Choi, Seung-Bok ; Nguyen, Vien Quoc ; Moon, Seok-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 768~773
DOI : 10.5050/KSNVE.2011.21.8.768
This work presents an experimental investigation on vibration control of the active hybrid mount system for naval ships. To reduce unwanted vibrations, this paper proposes an active mount which consists of rubber element, piezostack actuator and inertial mass. The rubber element supports a mass. The piezostack actuator generates a proper control force and supply it to the mount system. To avoid being broken piezostack actuator, an actuator of the proposed mount is devised as an inertial type, in which a piezostack actuator is positioned between inertial mass and rubber element. Vibration control performances of the active mount system are evaluated via experiment. To attenuate the unwanted vibrations transferred from upper mass, the feedforward control is designed. In order to implement a control experiment, the active mount system supported by four active mounts is constructed. For realization of the controller, one-chip board is manufactured and utilized. Subsequently, vibration control performances of the proposed active mount system are experimentally evaluated in frequency domains.
Evaluation of Vehicle Seat Rattle Noise Using Coherence Function Technique
Seo, Bum-June ; Jeong, Jae-Eun ; Park, Goon-Dong ; Kim, Hak-Gyun ; Park, Sang-Do ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 8, 2011, Pages 774~780
DOI : 10.5050/KSNVE.2011.21.8.774
Recently, customers have been concerned about vehicle NVH depending on vehicle designing and manufacturing technologies development. In choosing vehicle, vehicle NVH is becoming the most important factor to customers. Especially, a seat is the final stage of vibration transfer path to passengers from all sources of vibration like engine, transmission and etc. And seat is the nearest component from driver's ear. For this reason, seat is the most important component that directly related to ride comfort for passengers. And driver can be influenced sensitively by BSR caused by seat. Thus, evaluating the vibration characteristics of vehicle seat and BSR caused by vehicle seat is necessary to reduce the seat BSR. The rattle noise occurred from seat has evaluated through sound source visualization and multi-dimensional spectral analysis - coherence function technique in this paper. Vibration characteristics of the seat has verified through modal test.