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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 20, Issue 12 - Dec 2010
Volume 20, Issue 11 - Nov 2010
Volume 20, Issue 10 - Oct 2010
Volume 20, Issue 9 - Sep 2010
Volume 20, Issue 8 - Aug 2010
Volume 20, Issue 7 - Jul 2010
Volume 20, Issue 6 - Jun 2010
Volume 20, Issue 5 - May 2010
Volume 20, Issue 4 - Apr 2010
Volume 20, Issue 3 - Mar 2010
Volume 20, Issue 2 - Feb 2010
Volume 20, Issue 1 - Jan 2010
Selecting the target year
Variation of Eigenvalues of the Multi-span Fuel Rod due to Periodic Flow Disturbance by the Flow Mixer
Lee, Kang-Hee ; Woo, Ho-Kil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 215~222
DOI : 10.5050/KSNVE.2010.20.3.215
Long and slender body, like a fuel rod, oscillating in axial flow can be unstabilized even by the small cross flow which can be activated by the flow mixer or turbulent generator. It is important to include these effects of flow disturbance in dynamic stability analysis of nuclear fuel rod. This work shows how eigen frequency of a multi-span fuel rod can be changed by the swirl flow, which is discretely generated by a flow mixer. By solving a state-space form of the eigenvalue equation for a multi-span fuel rod system, the critical velocity at which a fuel rod becomes unstable was calculated. Based on the simulation results, we evaluated how stability of a multi-spanned nuclear fuel rod with mixing vanes can be affected by the coolant flow in an operating reactor core.
The Development & Simulation for the Isolation Mount installed in Aircraft
Jeon, Hee-Ho ; Park, Jae-Min ; Lee, Seung-Joon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 223~228
DOI : 10.5050/KSNVE.2010.20.3.223
The mount which is used in military airplane should be operated in various situations such as vibration, shock and temperature. The recent mounts cost a lot and take much time to replace when they broke down. That's why new mount was produced in domestic by reverse engineering and the product has been proved its performance through environment test regarding vibration and shock. According to simulation of dynamic characteristics on vibration and shock, the result turns out to be similar to the result of the environmental test with an error of within 10 percent. As a result this research, a draft of the military aviation mount designing program is arranged.
Analysis of Pitch Static Attitude in Thermally Assisted Magnetic Recording Suspension
Kim, Ki-Hoon ; Lee, Yong-Hyun ; Kim, Seok-Wan ; Lee, Sang-Jic ; Park, No-Cheol ; Park, Young-Pil ; Park, Kyoung-Su ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 229~234
DOI : 10.5050/KSNVE.2010.20.3.229
This paper presents the analysis of pitch static attitude(PSA) in thermally assisted magnetic recording(TAMR) suspension. The TAMR suspension using an optical fiber has high stiffness such as vertical, pitch and roll. Therefore, P-torque is greatly increased by the optical fiber. Also, flying height(FH) of the slider with TAMR suspension can be largely changed by PSA. In this paper, we focus on the FH by PSA of TAMR suspension. The FH is investigated using various PSA and proper PSA is proposed.
The Optimization of Vehicle Engine Mounting System Using DFSS(design for six sigma) Technique
Park, Un-Hwan ; Song, Yoon-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 235~241
DOI : 10.5050/KSNVE.2010.20.3.235
Engine Mount plays an important role which supports engine, isolates vibration from engine and blocks the vibration from road. Development of engine mount for NVH costs great a deal. So, the cost of development being reduced, the way developed effectively engine mount using DFSS technique is proposed in this paper. CTQ(critical to quality) is vibration and parameter is dynamic stiffness of mounts. The core parameters are selected with TPA(transfer path analysis) technique. It uses design of experiments(DOE) or Taguchi Methods to optimize parameter values and reduce variation. And then, this paper shows the result of improvement for vibration in the developing vehicle.
An Experimental Study and Analysis on NVH Behaviors of the Planetary Gear Set
Lee, Hyun-Ku ; Kang, Koo-Tae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 242~248
DOI : 10.5050/KSNVE.2010.20.3.242
In this paper, Verification of the qualitatively identical relationships existing between simulation data and experimental results allowed for a new analysis procedure of a planetary gear set -- in an automatic transmission -- to be conducted. Tooth profiles were found to be crucial to the gear mesh forces of the planetary gear set. Based on Kahraman's Model, dynamic resonances of the planetary gear set were found to be out of operating range. Most importantly, a 2DPLANETARY FEM program, an innovative design tool for planetary gear sets, was utilized.
Performance Analysis with Different Tire Pressure of Quarter-vehicle System Featuring MR Damper
Sung, Kum-Gil ; Lee, Ho-Guen ; Choi, Seung-Bok ; Park, Min-Kyu ; Park, Myung-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 249~256
DOI : 10.5050/KSNVE.2010.20.3.249
This paper presents performance analysis of a quarter-vehicle magneto-rheological(MR) suspension system with respect to different tire pressure. As a first step, MR damper is designed and manufactured based on the optimized damping force levels and mechanical dimensions required for a commercial mid-sized passenger vehicle. After experimentally evaluating dynamic characteristics of the manufactured MR damper, the quarter-vehicle MR suspension system consisting of sprung mass, spring, tire and the MR damper is constructed in order to investigate the ride comfort. 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 quarter-vehicle MR suspension system. Ride comfort characteristics such as vertical acceleration RMS and weighted RMS of sprung mass are evaluated under various road conditions.
A Study on the Increase of Transmission Loss of Metro Train
Choi, Yong-Woon ; Koo, Jeong-Seo ; You, Won-Hee ; Koh, Hyo-In ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 257~262
DOI : 10.5050/KSNVE.2010.20.3.257
Lower tunnels and concrete based tracks are introduced to newly constructed metro lines to reduce the construction and track maintenance fees. But such a lower tunnel together with concrete based track causes higher interior noise of metro trains. It is required that the trains should not only be a transportation media but also be comfortable. So, to lower the metro train's interior noise level, design was made to increase the transmission loss per sectional part. Through such a design, it is expected that about 7 dB(A) of noise level will be reduced compared to that of the conventional train.
Identification of Input Force for Reaction Wheel of Satellite by Measured Action Forceon Decelerating
Shin, Yun-Ho ; Heo, Yong-Hwa ; Oh, Shi-Hwan ; Kim, Dae-Kwan ; Kim, Kwang-Joon ; Yong, Ki-Lyuk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 263~271
DOI : 10.5050/KSNVE.2010.20.3.263
A reaction wheel is commonly used, as an important actuator, to control the attitude of a satellite. Operation of the reaction wheel plays a role of an excitation source to loading equipment inside the satellite. As requirements for environmental vibration to manifest the performance of precision equipment are getting more stringent, the research for analysis or reduction of unwanted action force in high frequency range when operating the reaction wheel is necessary. In this paper, the procedure to extract input forces and damping of a rotor system of reaction wheel is suggested. The analysis for measured action forces of reaction wheel is accomplished and important higher harmonics of action forces are determined. The input forces and damping of the rotor system are, then, extracted by curve-fitting and a particular solution for input force.
Damage Detection of Plate Using Long Continuous Sensor and Wave Propagation
Lee, Jong-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 272~278
DOI : 10.5050/KSNVE.2010.20.3.272
A method for damage detection in a plate structure is presented based on strain waves that are generated by impact or damage in the structure. Strain responses from continuous sensors, which are long ribbon-like sensors made from piezoceramic fibers or other materials, were used with a neural network technique to estimate the damage location. The continuous sensor uses only a small number of channels of data acquisition and can cover large areas of the structure. A grid type structural neural system composed of the continuous sensors was developed for effective damage localization in a plate structure. The ratios of maximum strains and arrival times of the maximum strains obtained from the continuous sensors were used as input data to a neural network. Simulated damage localizations on a plate were carried out and the identified damage locations agreed reasonably well with the exact damage locations.
A Robust Track-following Control for the Stable Coarse Seek
Lee, Moon-Noh ; Jin, Kyoung-Bog ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 279~286
DOI : 10.5050/KSNVE.2010.20.3.279
In this paper, we provide a robust track-following controller design method for the stable coarse seek control. Due to the inaccurate velocity control during a coarse seek, the shake of fine actuator is generated and thus a gain-up track-following control is required to complete stably the coarse seek. To this end, a loop gain adjustment algorithm is introduced to estimate accurately the shake of fine actuator. A weighting function can be properly selected from a minimum tracking gain-up open-loop gain, calculated from the estimated shake quantity of fine actuator. A robust tracking gain-up controller is designed by considering a robust
control problem using the weighting function. The proposed design method is applied to the coarse seek control system of an optical rewritable drive and is evaluated through the experimental results.
Experiment of a Liquid Damper Controlling Bi-directional Wind Responses of a Tall Building
Lee, Hye-Ri ; Min, Kyung-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 287~295
DOI : 10.5050/KSNVE.2010.20.3.287
This study deals with the design of a bi-directional damper using a tuned liquid damper(TLD) and a tuned liquid column damper(TLCD) for a SDOF building. Two dampers are usually needed to reduce wind-induced responses of tall buildings since they are along and across wind ones. The proposed damper has the advantage of controlling both responses with a single damper. The damper used in this study behaves as both a TLCD in a specific translational direction and a TLD in the other orthogonal direction. This paper presents experimental verification to confirm its control performance. First, shaking table test is carried out to investigate reducing responses by the damper. Control performance of the damper is expressed by the transfer function from shaking table accelerations to SDOF building ones. Testing results show that the damper reduced bi-directional responses of a SDOF building. Also, it reduced torsion responses.
Mode Conversion and Energy Transmission Ratio of Elastic Waves
Kim, Tae-Eon ; Chun, Han-Yong ; Kim, Jin-Oh ; Park, Joon-Kwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 296~307
DOI : 10.5050/KSNVE.2010.20.3.296
This paper deals with the energy transmission ratio of the elastic waves transmitting through a solid wall. Based on the displacement of the reflected and transmitted waves relative to the incident waves, the energy transmission ratio of the wave was obtained by multiplying the vibration velocity and stresses. Numerical calculation provided with the transmission ratio and refraction angle corresponding to the incidence angle, and it showed the mode conversion from the incident longitudinal wave to the transmitted transverse wave in particular incidence angle range. The paper established a procedure to find the incidence angle of the maximum energy transmission ratio and confirmed it by experiment.
Photogrammetry-based Modal Parameter Extraction from Motion Pictures
Kim, Byeong-Hwa ; Yeo, Keum-Soo ; Kim, Soo-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 3, 2010, Pages 308~315
DOI : 10.5050/KSNVE.2010.20.3.308
This study introduces a new technique to estimate modal parameters of a vibrating string using motion pictures. The approach requires two motion pictures for a vibrating string captured simultaneously by typical potable digital cameras or camcorders. Applying the space intersection theory and the space resection theory in photogrammetry, the steroscopic images for the string are constructed from two flat plane pictures. Then the three dimensional displacement components of the string are extracted by a multiple template matching technique. Finally the modal parameters of the string are estimated from the resulting displacement time histories. The accuracy of the approach has been examined through a small-scale mock-up of a string.