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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
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Forced Vibration of a Circular Ring with Harmonic Force
Hong, Jin-Sun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 123~128
DOI : 10.5050/KSNVN.2005.15.2.123
Forced vibration of a thin circular ring with a concentrated harmonic force is analyzed when the ring is free and has only the in-plane motion. Using the unit doublet function for external force, the governing equation is obtained and is solved by the use of Laplace transform. The exact solutions of displacement components and bending moment are obtained. In order to verify the solutions of analysis, finite element analysis is performed and the results shows good agreement. Then, frequency response curves for displacement and bending moment are obtained. In deriving the governing equations and the solutions, nondimensional parameter of the exciting frequency and the magnitude of exciting force are extracted. As the displacement components are obtained, the remaining bending strain, slope, curvature, shear force, etc. can also be derived. With the results of this work, the responses of a free ring excited on multiple points with different frequencies can also be obtained easily by superposition.
A Parametric Study of Aerodynamic Noise in Centrifugal Compresso
Sun, Hyosung ; Lee, Soogab ; Lee, Jungeun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 129~134
DOI : 10.5050/KSNVN.2005.15.2.129
This paper describes the influence of geometric parameters on the noise generation from a centrifugal compressor. From the analysis of noise measurements, it is observed that Blade Passing Frequency noise related to the rotating impeller is more important, and it is focused on the comparison of this discrete frequency noise according to the shape change. Navier-Stokes solver is used to simulate the flow-field of the impeller and the vaned diffuser, and time-dependent pressure data are calculated and Fourier-transformed to perform the near-field noise prediction. The effects of various geometry design variables such as the gap between the impeller and the diffuser, impeller shape variations on the near-field noise distribution are investigated.
Modeling of Automobile Suspension System for Analyzing Automobile Vibration
Lee, Tae-keun ; Kim, Byong-sam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 135~147
DOI : 10.5050/KSNVN.2005.15.2.135
As automobile technology advances, a smoother ride with less noise is desired. In order to achieve these purposes, a study on the vibration and noise produced by a moving automobile was carried out and a model for tire vibration characteristics which influence the ride performance was developed. The model was verified through simulations and experiments. The developed model was then applied to a half car model and automobile vibrations were analyzed. The effects of tire design parameters on the automobile vibration energy were investigated. The results from laboratory and field tests confirm the validity of the analytical model. The 17-DOF half-car model was built to analyze automobile vibration. The characteristics of the nonlinear model for a shock absorber were applied to this model. The results from the present 17-DOF half car model incorporating the analytical tire model with tire design parameters, were compared with the 5-DOF half car model where the tire was modeled with linear springs. The results of the 17-DOF model are close to the experimental results. Using the 17-DOF model, the influence of tire design parameter were considered. According to the analysis results, the vibrations at seat/body/wheel were predicted by simulation and experiment.
Automation of Feature Modeling for HDD Fluid Dynamic Bearing Design
Lee, Nam-Hun ; Kwon, Jeong-Min ; Koo, J.C. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 148~155
DOI : 10.5050/KSNVN.2005.15.2.148
As functional requirement of massive digital information storage devices are on a trend for the higher data transfer rate and lower cost, many different technical efforts are being tested and implemented in the industry. FDB(fluid dynamic bearing) is one of the major breakthroughs in rotor design in terms of TMR(track misregistration) budget. Although FDB analysis based on Reynolds` equation is well established and popularly being used for FDB design especially for the estimation of bearing stiffness, there are obvious limitations in the approach due to the inherent assumptions. A generalized analysis tool employing the full Navier-Stokes equation and the energy balance is to be beneficial for detailed FDB design. In this publication, an efficient geometry modeling method is presented that provides fully integrated inputs for general FVM/FDM(finite volume method/ finite difference method) codes. By virtue of the flexibility of the presented method, many different detailed FDB design and analysis are carried over with ease.
Development of 3-Axis slim Actuator Using Moving Magnet and PCB
Yoon, Young-Bok ; Shin, Kyung-Sik ; Nam, Do-Sun ; Yang, Yoon-Tak ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 156~160
DOI : 10.5050/KSNVN.2005.15.2.156
We design a new actuator of 3-axis motion for high performance optical devices. The actuator makes it possible to control the tilting motion by using moving magnet and PCB-coil, which have benefits in price and manufacturing. To predict the characteristics of the actuator, especially the effect of moving magnet, finite element method and electro-magnetic analysis were used. By comparing simulation data with experimental results, we verified the accuracy of the simulation and the superiority of the present.
Sound Control of Structural-acoustic Coupling System Using Optimum Layout of Absorbing Material and Damping Material
Kim, Dong-Young ; Hong, Do-Kwan ; Ahn, Chan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 161~168
DOI : 10.5050/KSNVN.2005.15.2.161
The absorbing material is mostly used to changing the acoustic energy to the heat energy in the passive control, and that consists of the porous media. That controls an air borne noise while the stiffened plates, damping material and additional mass control a structure borne noise. The additional mass can decrease the sound by mass effect and shift of natural frequency, and damping material can decrease the sound by damping effect. The passive acoustic control using these kinds of control materials has an advantage that is possible to control the acoustic in the wide frequency band and the whole space at a price as compared with the active control using the various electronic circuit and actuator. But the space efficiency decreased and the control ability isn`t up to the active control. So it is necessary to maximize the control ability in the specific frequency to raise the capacity of passive control minimizing the diminution of space efficiency such an active control. Therefore, the characteristics of control materials and the optimum layout of control materials that attached to the boundary of structure-acoustic coupled cavity were studied using sequential optimization on this study.
Vibration Control of a Single-Link Flexible Manipulator Using Reaction Moment Estimator
Shin, Hocheol ; Han, Sangsoo ; Kim, Seungho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 169~175
DOI : 10.5050/KSNVN.2005.15.2.169
In this paper, a novel vibration control scheme for a single-link flexible manipulator system without using a vibration feedback sensor is proposed. In order to achieve the vibration information of the flexible link, a reaction moment estimator based on the dynamic characteristics of the flexible manipulator is proposed. While the manipulator is maneuvering the reaction moment is reciprocally acting on the flexible link and the hub inertia due to the vibration of the link. A sliding mode controller based on the equivalent rigid body dynamics corresponding to the proposed flexible manipulator is then augmented with the reaction moment estimator to realize a decentralized control system. The reaction moment estimator is implemented via the first order low pass filter. The performance of the proposed control scheme is verified by computer simulation and experiment.
A Study on Silencer Performance Assessment under Onboard Condition
Lee, Do-Kyung ; Jin, Bong-Man ; Lee, Cheul-Won ; Kim, Nho-Sung ; Choi, Su-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 176~183
DOI : 10.5050/KSNVN.2005.15.2.176
The exhaust noise of auxiliary engine in ships is directly transmitted to bridge wing with only distance attenuation. It is not easy to find out practical treatment to be applied between exhaust pipe and bridge wing to reduce the transmission of the exhaust noise. In general, therefore, a silencer is fitted to reduce the exhaust noise and correspondingly noise of bridge wing. The silencer should be properly designed under the consideration of the frequency component of the exhaust noise and the required performance such as noise reduction or insertion loss. In general, the gas inside the exhaust pipe flows with high temperature and speed and thus onboard test condition is more adverse than the standard atmospheric condition. In this study, the test method to evaluate silencer performance using a probe microphone is introduced.
Design of the Slider and Suspension for 4 × 1 Near-field Probe Array in Micro Optical Disk Drives
Hong, Eo-Jin ; Jung, Min-Su ; Oh, Woo-Seok ; Park, No-Cheol ; Yang, Hyun-Seok ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 184~191
DOI : 10.5050/KSNVN.2005.15.2.184
The near-field scanning micro scope (NSOM) technique is in the spotlight as the next generation storage device. Many different types of read/write mechanism for NSOM have been introduced in the literature. In order for a near-field probe to be successfully implemented in the system, a suitable slider and suspension are needed to be properly designed. The optical slider is designed considering near-filed optics and probe array. The suspension generally supports slider performance, and tracking servo capacity in HDD. Moreover, the suspension for optical slider also should meet the optical characteristics, and is also required to satisfy shock performances for the mobility for the actuator. In this study, the optical slider and the suspension for near-field probe array are designed and analyzed.
Analysis of Damped Vibration Signal Using Empirical Mode Decomposition Method
Lee, Injae ; Lee, Jong-Min ; Hwang, Yoha ; Huh, Kunsoo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 192~198
DOI : 10.5050/KSNVN.2005.15.2.192
Empirical mode decomposition(EMD) method has been recently proposed to analyze non-linear and non-stationary data. This method allows the decomposition of one-dimensional signals into intrinsic mode functions(IMFs) and is used to calculate a meaningful multi-component instantaneous frequency. In this paper, it is assumed that each mode of damped vibration signal could be well separated in the form of IMF by EMD. In this case, we can have a new powerful method to calculate natural frequencies and dampings from damped vibration signal which usually has multiple modes. This proposed method has been verified by both simulation and experiment. The results by EMD method whichhas used only output vibration data are almost identical to the results by FRF method which has used both input and output data, thereby proving usefulness and accuracy of the proposed method.
Responses and Modal Analyses of Micro Double Cantilever Beams Interacted by Elctrostatic Forces
Jung, Kang-Sik ; Moon, Seung-Jae ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 199~205
DOI : 10.5050/KSNVN.2005.15.2.199
The governing equations of micro double cantilever beam structures interacted by electrostatic forces are obtained employing Galerkin`s method based on Euler beam theory. Variations of static and dynamic responses as well as natural frequencies are estimated for applied voltages. In particular, it is investigated how the variations of beam properties resulted by manufacturing process influence the deflections and the modal characteristics. This study can help to design MEMS structures and to predict the performances with respect to manufacturing tolerances.
Analysis of Flexible Media Behavior by Dynamic Elastica
Hong, Sung-Kwon ; Jee, Jung-Geun ; Jang, Yong-Hoon ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 206~212
DOI : 10.5050/KSNVN.2005.15.2.206
In many machines handling lightweight and flexible media, such as magnetic tape drives, xerographic copiers and sewing machines, the media must transit an open space. It is important to predict the static and dynamic behavior of the sheets with a high degree of reliability. The nonlinear theory of the dynamic elastica has often been used to a nonlinear dynamic deflection model. In this paper, the governing equation is derived and simulated by the finite difference method. The parametric cubic curve is applied for defining the guide shape. The dynamic contact conditions suggested by Klarbring is used to predict the direction of the flexible media according to the initial velocity and the friction coefficient. The analysis is also compared to the conventional model, showing that after contacting a
wall, the directions of flexible media of two models are different.
Damping Properties of Plastic with Temperature Variation
Shin, Su-Hyun ; Jung, Sung-Soo ; Lee, Yong-Bong ; Lee, Doo-Hee ; Nam, Hyo-Duk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 213~218
DOI : 10.5050/KSNVN.2005.15.2.213
It is well known that the loss factor and Young`s modulus are fundamental mechanical properties of materials. Recently, the use of complex plastics is increasing for vibration proof. In this study, we evaluated two mechanical values of polycarbonate and acrylonitrile butadiene styrene by using two different standard test methods of ASTM E 756 and ISO 6721. Because damping properties of material generally depend on temperature, test specimen‘s temperature were controlled in the temperature range between -
. The results shown that the loss factor of polycarbonate gradually increased as increasing temperature, while the Young`s modulus decreased. However, the loss factor and the Young`s modulus of acrylonitrile butadiene styrene are varied somewhat at
Vibration Characteristics of the Tower Structure of a 750kW Wind Turbine Generator
Kim, Seokhyun ; Nam, Y.S. ; Eun, Sungyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 219~224
DOI : 10.5050/KSNVN.2005.15.2.219
Vibration response of the tower structure of a 750kW wind turbine (W/T) generator is investigated by measurement and analysis. Acceleration response of the W/T tower under various operation condition is monitored in real time by the vibration monitoring system using LabVIEW. Resonance state of the tower structure is diagnosed in the operating speed range. Resonance frequency range of the test model is investigated with the wind speed data of the test site. To predict the tower resonance frequency, tower is modeled as an equivalent beam with a lumped mass and Rayleigh energy method is applied. Calculated tower bending frequency is in good agreement with the measured value and the result shows that the simplified model can be used in the design stage of the W/T tower.
A Design Method for Direction Selective Structural-acoustic Coupled Radiator
Seo, Hee-Seon ; Kim, Yang-Hann ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 225~231
DOI : 10.5050/KSNVN.2005.15.2.225
This paper presents a design method for the structural-acoustic coupled radiator that can emit sound in the desired direction. A coupled system that has a finite space and a semi-infinite space separated by two flexible walls and an opening is considered. An objective function is selected to maximize radiation power on a main axis and minimize a side lobe level. To get initial values, prediction of a pressure distribution on field points and radiation pattern of the structural-acoustic coupling system is shown at a coupled-resonant frequency. Three different optimization methods are adapted to design the coupled radiator. Pressure and intensity distribution of the designed radiator is presented.
Optimal Design of the Plate Spring Suspension in an Optical Pickup Actuator
Hong, Hyeoksoo ; Yoo, Jeonghoon ; Lee, Ho-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 232~238
DOI : 10.5050/KSNVN.2005.15.2.232
This paper proposed an optimal plate spring design for the optical pickup suspension. This method requires an analytic solution of plate spring suspension and it can be obtained by Castigliano`s theorem and moment equilibrium. However, it is very complex due to the many design variables coupled and some constraints such as pitching angle in focusing motion caused by the characteristics of plate spring. Because of the complex formulation of the analytical solution that is used as the design objective, the genetic algorithm is used to find the optimal design value satisfying design constraints.
Development of a Contact-Type Counting Device Using a Piezoelectric Film as a Sensor
Yoo, Wan-Dong ; Kim, Jin-Oh ; Park, Kwang-Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 2, 2005, Pages 239~247
DOI : 10.5050/KSNVN.2005.15.2.239
This paper deals with the development of a contact-type counting device using a piezoelectric polymer film as a sensor. The piezoelectric and vibration characteristics of the film under a bending vibration were investigated theoretically and experimentally. A counting device, which includes filters, an amplifier, an analog-digital converter, and a display, was designed and fabricated. The performance of the piezoelectric polymer sensor was evaluated in the sense of the responses to contact force, contact frequency, and contact speed. The life and the temperature effect were also investigated for the piezoelectric film sensor.