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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 15, Issue 12 - Dec 2005
Volume 15, Issue 11 - Nov 2005
Volume 15, Issue 10 - Oct 2005
Volume 15, Issue 9 - Sep 2005
Volume 15, Issue 8 - Aug 2005
Volume 15, Issue 7 - Jul 2005
Volume 15, Issue 6 - Jun 2005
Volume 15, Issue 5 - May 2005
Volume 15, Issue 4 - Apr 2005
Volume 15, Issue 3 - Mar 2005
Volume 15, Issue 2 - Feb 2005
Volume 15, Issue 1 - Jan 2005
Selecting the target year
Development of NASTRAN-based Optimization Framework for Vibration Optimum Design of Ship Structure.
Kong, Y.M. ; Choi, S.H. ; Chae, S.I. ; Song, J.D. ; Kim, Y.H. ; Yang, B.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1223~1231
DOI : 10.5050/KSNVN.2005.15.11.1223
Recently, the issue of ship nitration due to the large scale, high speed and lightweight of ship is emerging. For pleasantness in the cabin, shipbuilders are asked for strict vibration criteria and the degree of nitration level at a deckhouse became an important condition for taking order from customers. This study proposes a new optimization framework that is NASTRAN external call type optimization method (OptShip) and applies to an optimum design to decrease the nitration level of a deckhouse. The merits of this method are capable of using of global searching method and selecting of various objective function and design variables. The global optimization algorithms used here are random tabu search method which has fast converging speed and searches various size domains and genetic algorithm which searches multi-point solutions and has a good search capability in a complex space. By adapting OptShip to full-scale model, the validity of the suggested method was investigated.
An Experimental Study on the Vibrational Characteristics of the Rotor Blade with Fiber Reinforced Plastics
Paik, J.S. ; Lee, K.S. ; Park, J.V. ; Lee, J.T. ; Son, C.Y. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1232~1240
DOI : 10.5050/KSNVN.2005.15.11.1232
The purpose of this paper is that investigates the dynamic behavior characteristic of W.T.S (wind turbine system) and carries out the evaluation analysis during operating W.T.S. To investigate the dynamic behavior characteristic of W.T.S, the experiments to measure vibration of the blade from the attached accelerometer on the flap and edge section of the blade that is one of the most important elements of dynamic characteristic of W.T.S are performed. Natural frequency and mode shape are calculated with commercial program ( ANSYS) using the measured vibration acceleration that receives the signal with F.F.T Analyzer from the accelerometer For validation of these experiments, the finite element analysis is performed with commercial F.E.M program (ANSYS) on the basis of the natural frequency and mode shape. The results indicate that experimental values have good agreements with the finite element analysis.
Automation of Primary Vibration Calibration System Using Laser Interferometer
Cho, Seung-Il ; Lee, Yong-Bong ; Jeon, Byeong-Su ; Lee, Jong-Kyu ; Lee, Doo-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1241~1247
DOI : 10.5050/KSNVN.2005.15.11.1241
An automation of primary vibration calibration system was developed and tested. Using GPIB interface, the console PC make the control of equipments, signal collecting and save measuring results automatically by the instructions in the program by Visual Basic. Several trials of automatic calibration for the accelerometer(ENDEVCO 2270) using this developed system give the reliable results.
Load/unload Dynamics of Slider on Ramp for Various Ramp Shapes
Park, Kyoung-Su ; Park, No-Cheol ; Yang, Hyun-Seok ; Park, Young-Pil ; Lee, Yong-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1248~1254
DOI : 10.5050/KSNVN.2005.15.11.1248
L/UL(Load/unload) mechanism has been widely used in SFF(Small form factor) HDD because L/UL technology has many advantages such as an increase of areal density, reduction of power consumption and improvement of shock resistance. In this system, the most important design goal is no slider-disk contact and fast air-hearing breaking during L/UL process. To do so, we should consider many design parameters related to L/UL system. The ramp shape is the most dominant component among parameters which dramatically affect the L/UL performance. This paper makes an advanced ramp model using ANSYS/LS-DYNA. Through this FE model, this paper investigates the effect of initial ramp slope and location of air-bearing breaking. From the experiment for three different ramps, we also verify that experimental results agree with simulation results. We conclude that the ramp design should have small ramp slope at the moment which a suspension tap contacts with ramp and large ramp slope after air-bearing breaking in order to improve L/UL Performance.
Dynamic Contact of a Cantilever Beam with Rigid Wall Condition
Jang, Young-Ki ; Kim, Jae-Ik ; Kim, Kyu-Tae ; Park, Nam-Gyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1255~1261
DOI : 10.5050/KSNVN.2005.15.11.1255
The dynamic contact model of a beam that contacts to a rigid wall in a reactor core was studied. The gap between the beam and contact wall results in dynamic contact accompanying inequality constraints. The inequality constraints can be relieved to an equality constraint problem by introducing a convex Penalty function. In this work, a beam with contact condition is formulated using quasi-convex penalty function and numerically solved. General coordinate solution is adopted to raise computational efficiency. Also nonlinearity is examined In the beam contacting to a rigid wall.
Investigation of Dynamic Property of Squeeze Film Damper Using Magnetic Fluid
Ha, Jong-Yong ; Kim, Yong-Han ; Yang, Bo-Suk ; Morishita Shin ; Ahn, Kyoung-Kwan ; Ahn, Young-Kong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1262~1267
DOI : 10.5050/KSNVN.2005.15.11.1262
The paper presents the identification of dynamic property of a rotor system with a squeeze film damper (SFD) using magnetic fluid. An electromagnet Is installed in the inner damper of the SFD. The magnetic fluid is well known as a functional fluid. Its rheological property can be changed by controlling the applied current to the fluid and the fluid can be used as lubricant. Basically, the proposed SFD has the characteristics of a conventional SFD without an applied current, while the damping and stiffness Properties change according to the variation of the applied electric current. Therefore, when the applied current is changed, the whirling vibration of the rotor system can be effectively reduced. The clustering-based hybrid evolutionary algorithm (CHEA) is used to identify linear stiffness and damping coefficients of the SFD based on measured unbalance responses.
Element Design of Balancing Shaft for Reducing the Vibration in Engine Module
Lee, Bong-Hyun ; Kim, Dong-Chul ; Jung, In-Oh ; Kim, Chan-Jung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1268~1275
DOI : 10.5050/KSNVN.2005.15.11.1268
Vibration in Engine module could be reduced by introducing a balance shaft module which has one or more unbalanced rotors. Since the unbalanced rotor is installed in an opposite direction of the free force or unbalance moment by engine component, the unexpected vibration could be decreased kinematically. The essential equation of the unbalanced rotor was Presented for two cases, 3 in-line and 4 in-line cylinder engine type, And the efficiency of the balance shaft is investigated by the vehicle testing that is focused on measuring the reduced vibration level when adapting a balancing module. With the signal processing of measured signals, some important issues on design the balancing shaft could be derived and the overall design process is explained in the final part including the peripheral component, i.e. housing and bush.
Interaction Analysis of Dual-stage System during Seek Motion and Control for Track Pull-in Enhancement
Lee, Kwang-Hyun ; Yang, Hyun-Seok ; Park, No-Cheol ; Park, Young-Pil ; Choi, Jin-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1276~1286
DOI : 10.5050/KSNVN.2005.15.11.1276
In this paper, the dual stage interaction between the coarse actuator and the fine actuator of an optical disk drive is studied, and the new control method to enhance the track pull-in performance using fine actuator control is proposed. First, the dynamic analysis for the dual stage and the experiments to find the each actuator dynamics are performed. From the experiments, some physical parameters of the actuators were derived, then, some simulations are performed to find the interaction effect of the fine actuator during seek motion. Second, the center servo which suppresses the vibration of fine actuator during seek motion is designed and evaluated. And the fine actuator control to reduce the relative velocity between the target track and beam spot is proposed. From simulations, we show that fine actuator control which has same frequency and same phase of the disturbance is effective to reduce the relative velocity, and this result leads to track pull-in enhancement. Hence, the proposed control method is good approach to improve the track pull-in performance. Finally, the realization of the proposed method and some comments of it are briefly discussed.
Stability Analysis of Beck`s Column with a Tip Mass Restrained by a Spring
Li, Guangfan ; Oh, Sang-Jin ; Kim, Gwon-Sik ; Lee, Byoung-Koo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1287~1294
DOI : 10.5050/KSNVN.2005.15.11.1287
The purpose of this paper is to investigate free vibrations and critical loads of the Beck`s columns with a tip spring, which carry a tip mass. The ordinary differential equation governing free vibrations of Beck`s column subjected to a follower force is derived based on the Bernoulli-Euler beam theory Both the divergence and flutter critical loads are calculated from the load-frequency corves that are obtained by solving the differential equation numerically. The critical loads are presented in the figures as functions of various non-dimensional system parameters such as the subtangential parameter, mass ratio and spring parameter.
A Flexure Guided Planar Scanner for Scanning Probe Microscope ; Part 2. Evaluation of Static and Dynamic Properties
Lee, Moo-Yeon ; Gweon, Dae-Gab ; Lee, Dong-Yeon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1295~1302
DOI : 10.5050/KSNVN.2005.15.11.1295
This paper shows experimental evaluation results of the nano-positioning planar scanner used in the scanning probe microscope. The planar scanner is composed of flexure guides, piezoelectric actuators and feedback sensors as like explained in detail in Ref. (5). First, the fabrication methods were explained. Second, as the static Properties of the Planar scanner. we evaluated the maximum travel range & crosstalk. Also, we presented the correcting method for crosstalk using electric circuits finally. as the dynamic properties of the planar scanner, we evaluated the first resonant frequency. Also, we presented the actual AFM(atomic force microscope) imaging results with up to 2Hz imaging scan rate. Experimental results show that properties of the proposed planar scanner are well enough to be used in SPM applications like AFM.
Adaptive Disturbance Compensation Control for Heavy Load Target Aiming Systems to Improve Stabilization Performances
Lim, Jae-Keun ; Choi, Young-Jun ; Lyou, Joon ; Seok, Ho-Dong ; Kim, Byung-Un ; Kang, Min-Sig ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1303~1310
DOI : 10.5050/KSNVN.2005.15.11.1303
Stabilization error of target aiming systems mounted on moving vehicles is an important performance because the error directly affects hit Probability. In a heavy load targetaiming system, the disturbance torque comes from mass unbalance and linear acceleration is a main source of stabilization error. This study suggests an experimental design method of disturbance feedforward compensation control to improve the stabilization performance of heavy load target aiming systems. The filtered_x least square(FxLMS) algorithm is used to estimate the compensator coefficients adaptively. The proposed control is applied to a simple experimental set-up which simulates dynamic characteristics of a real target aiming system. The feasibility of the proposedtechnique is illustrated, along with results of experiments.
Utilizing Noise Mapping in Environmental Impact Assessment in a Downtown Redevelopment Area
Lee, Shi-Won ; Park, Young-Min ; Choi, Jin-Kwon ; Chang, Seo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1311~1317
DOI : 10.5050/KSNVN.2005.15.11.1311
In environmental Impact assessment, noise impact assessment usually consists of three stages-surveying the existing noise levels by measurements, predicting noise levels induced by construction works and predicting noise levels after the completion of a project. The distance-attenuation relation of a point source, which has been used to predict the noise level due to its simplicity does not consider complex acoustic phenomena like multi-reflection, -diffraction and -absorption due to complex topographic configuration of buildings and terrains. For the consideration of such physical complexities. a noise mapping tool is adopted to produce a series of noise maps, which are those for the present, tot the works of construction and for the future. For accurate noise mapping, acoustical and topographic Information is used. Standard sound power levels and directivities of various construction equipments are need and scheduling of construction processes and locations of the equipments should be provided. In the case of exceeding legal limit, mitigation measures are applied to satisfy the legal limits and subsequent noise map is obtained and checked.
Vibration Analysis for the Euler-Bernoulli Wedge Beam by Using Differential Transformation Method
Yun, Jong-Hak ; Shin, Young-Jae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 11, 2005, Pages 1318~1323
DOI : 10.5050/KSNVN.2005.15.11.1318
In this paper, the vibration analysis for the Euler-Bernoulli complete and truncate wedge beams by differential Transformation method(DTM) was investigated. The governing differential equation of the Euler-Bernoulli complete and truncate wedge beams with regular singularity is derived and verified. The concepts of DTM were briefly introduced. Numerical calculations are carried out and compared with previous published results. The usefulness and the application of DTM are discussed.