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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 25, Issue 12 - Dec 2015
Volume 25, Issue 11 - Nov 2015
Volume 25, Issue 10 - Oct 2015
Volume 25, Issue 9 - Sep 2015
Volume 25, Issue 8 - Aug 2015
Volume 25, Issue 7 - Jul 2015
Volume 25, Issue 6 - Jun 2015
Volume 25, Issue 5 - May 2015
Volume 25, Issue 4 - Apr 2015
Volume 25, Issue 3 - Mar 2015
Volume 25, Issue 2 - Feb 2015
Volume 25, Issue 1 - Jan 2015
Selecting the target year
Efficient Meshless Method for Accurate Eigenvalue Analysis of Clamped Plates
Kang, S. W. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 653~659
DOI : 10.5050/KSNVE.2015.25.10.653
A new formulation of the non-dimensional dynamic influence function method, which is a type of the meshless method, is introduced to extract highly accurate eigenvalues of clamped plates with arbitrary shape. Originally, the final system matrix equation of the method, which was introduced by the author in 1999, does not have a form of algebraic eigenvalue problem unlike FEM. As the result, the non-dimensional dynamic influence function method requires an inefficient process to extract eigenvalues. To overcome this weak point, a new approach for clamped plates is proposed in the paper and the validity and accuracy is shown in verification examples.
Characteristic Analysis and Design of a Precise Manipulation of Microparticle using Surface Acoustic Wave Device
Kim, Dongjoon ; Eom, Jinwoo ; Ko, Byung-Han ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 660~666
DOI : 10.5050/KSNVE.2015.25.10.660
Surface acoustic wave(SAW) device is used for transporting and patterning micro-scale particles such as cells. In this research, velocity of particles was investigated moved by SAW device with two types of interdigital electrode transducers(IDTs) under various conditions. SAW devices which have single IDTs and double IDTs were designed and fabricated. On the previous studies, resultant velocities of particles were predicted considering output power and power ratio between IDTs-shape. For more accurate prediction, power loss in SAW device and a power difference between two types of IDTs-shape were considered. Maximum error between the test results and predicted values was 5 % so the power loss must be considered in the velocity prediction of the particles.
Active Gurney Flap Design Modification for High Speed Operation and Natural Frequency Estimate
Kim, Taejoo ; Kim, Do-Hyung ; Paek, Seung-Kil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 667~676
DOI : 10.5050/KSNVE.2015.25.10.667
Working displacement variation by elastic deformation of active Gurney flap which was operated on high frequency was observed. Flap-wise natural frequency was lower than mode analysis result and hinge boundary condition was identified to be the cause through the simple modal test. Design modification for increasing natural frequency was conducted for minimizing the elastic deformation at maximum 35 Hz operating condition which was design requirement condition. Brass bushing was applied instead of rotating bearing for gap minimization and Gurney flap design modification was conducted to increase of the flap-wise natural frequency. Design modification effect was validated by natural frequency comparison with mode analysis result and modal test result of design modification model.
Selection of Fitness Function of Genetic Algorithm for Optimal Sensor Placement for Estimation of Vibration Pattern of Structures
Jung, Byung-Kyoo ; Bae, Kyeong-Won ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 677~684
DOI : 10.5050/KSNVE.2015.25.10.677
It is often necessary to predict the vibration patterns of the structures from the signals of finite number of vibration sensors. This study presents the optimal placement of vibration sensors by applying the genetic algorithm and the modal expansion method. The modal expansion method is used to estimate the vibration response of the whole structure. The genetic algorithm is used to estimate the optimal placement of vibration sensors. Optimal sensor placement can be obtained so that the fitness function is minimized in the genetic algorithm. This paper discusses the comparison of the performances of two types of fitness functions, modal assurance criteria(MAC) and condition number( CN). As a result, the estimation using MAC shows better performance than using CN.
Experimental Analysis of Operating Parameters for Piezoelectric Jetting Dispenser
Sohn, Jung Woo ; Hong, Seung-Min ; Kim, Gi-Woo ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 685~691
DOI : 10.5050/KSNVE.2015.25.10.685
In this work, to identify effective parameter for performance of piezoelectric jetting dispenser, experimental investigation is carried out based on design of experiment. After preparing jetting dispenser using two stack-type piezoelectric actuators, basic working principle of the jetting dispenser is described. Eight operating conditions are chose as main factors and it is assumed that each factor has two levels. To reduce number of experiments for performance evaluation, the experimental sets are designed based on factional factorial design method. Experimental setup is established and the weight of single dot is measured by using precision scale. The main and interaction effects of factors are analyzed using commercial statistical program and optimal operating condition for small amount and small variation of weight of dispensed single dot are determined.
Characterization of Buffeting Noise Through a Rear Window in an Automobile Using LBM
Lee, Songjune ; Choi, Hyunggyu ; Cho, Munhwan ; Ih, Kang-duck ; Cheong, Cheolung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 692~699
DOI : 10.5050/KSNVE.2015.25.10.692
Buffeting noise through a rear window in an automobile is investigated by using lattice Boltzmann method. The generation mechanism of the buffeting noise can be understood as the resonance mechanism in a Helmholtz resonator, which is driven by the convecting vortex in a shear-layer flow over the neck of the resonator. Two methods to suppress the buffeting noise are proposed, and their effects are quantitatively assessed. Opening front window reduces the observed buffeting tonal noise by 25 dB and the overall SPL by 4 dB, and the installation of a Helmholtz resonator acting as a dynamic damper reduces the tonal component that by 35 dB and the overall SPL by 10 dB.
Designing Electronics for High Frequency Shock
Lee, Jong-Hak ; Kang, Dong-Seok ; Choi, Ji-Ho ; Kang, Young-Sik ; Lee, Chang-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 700~706
DOI : 10.5050/KSNVE.2015.25.10.700
In this study, stability designing electronics mounted on launch vehicle for shock load(low/high frequency band) could be derived. For the low-frequency shock loads, CCA(circuit card assembly) has secured the structural integrity over the best natural frequency techniques. For the high-frequency shock load, the structural integrity could be ensured with applying device such as the insulation pad. When the EAR is applied, insulation effect of part application is good more than whole application.
Control Performance Investigation of Piezoelectric Actuators under Variation of External Heat Environment
Han, Young-Min ; Moon, Byung Koo ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 10, 2015, Pages 707~713
DOI : 10.5050/KSNVE.2015.25.10.707
This paper proposes experimental results for control performance deterioration of a piezoelectric actuator under high temperature conditions due to external heat environment. In this work, a heat environment from 30 ℃ to 190 ℃ is established by a heat chamber which is capable of high temperature of heat environment. Inside the heat chamber, an experimental apparatus consisting of the stack type of piezoelectric actuator, laser sensor, gap sensor and temperature sensor is established. After evaluating temperature dependent blocking force, displacement and time response of a piezoelectric actuator inside the heat chamber, tracking control performances are evaluated under various temperature conditions via proportional-integral-derivative(PID) feedback controller. The desired position trajectory has a sinusoidal wave form with a fixed frequency. Control performances are experimentally evaluated at both room temperature and high temperature and presented in time domain.