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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 18, Issue 12 - Dec 2008
Volume 18, Issue 11 - Nov 2008
Volume 18, Issue 10 - Oct 2008
Volume 18, Issue 9 - Sep 2008
Volume 18, Issue 8 - Aug 2008
Volume 18, Issue 7 - Jul 2008
Volume 18, Issue 6 - Jun 2008
Volume 18, Issue 5 - May 2008
Volume 18, Issue 4 - Apr 2008
Volume 18, Issue 3 - Mar 2008
Volume 18, Issue 2 - Feb 2008
Volume 18, Issue 1 - Jan 2008
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Control for a Yaw Error Compensation System of Linear Motor Stage
Lee, Seung-Hyun ; Kang, Min-Sig ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 997~1005
DOI : 10.5050/KSNVN.2008.18.10.997
Linear motor stage is a useful device in precision engineering field because of its simple power transmission mechanism and accurate positioning. Even though linear motor stage shows fine positioning accuracy along travel axis, geometric dependent errors which relay on machining and assembling accuracy should be addressed to increase total positioning performances. In this paper, we suggests a cost effective yaw error compensation servo-system which is mounted on platform of the stage and nullify travel position dependent yaw error. This paper also provides a method of designing a sliding mode control which is robust to existing friction disturbance and model uncertainties. The reachability condition of slinding mode control for the yaw error compensating servo-system has been established. From some experimental results by using an experimental set-up, the sliding mode control showed its effective in disturbance rejection and its performance was superior to conventional linear controls.
Vibration and Noise Control of the Simply Supported Slab Using the Multi-tuned Mass Damper
Hwang, Jae-Seung ; Hong, Geon-Ho ; Park, Hong-Gun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1006~1013
DOI : 10.5050/KSNVN.2008.18.10.1006
In this study, it is outlined that heavy weight floor impact noise induced by the vibration of slab can be reduced using multi tuned mass damper(MTMD) effectively. Substructure synthesis is utilized to develope analytical model of the slab coupled with MTMD and acoustic power is introduced to evaluate the performance of noise control for simplicity. Numerical analysis is carried out to investigate the effect of the properties of MTMD on the vibration and noise control of the simply supported slab. Numerical analysis shows that mass ratio of MTMD is critical on the vibration and noise control of the slab and it is also essential to reduce the vibration in higher modes of slab in the light of its great effect on the radiation of sound.
Vibration Analysis and Mitigable Countermeasures of Semi High-speed Subway Electric Trains
Park, Ki-Soo ; Choi, Yeon-Sun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1014~1023
DOI : 10.5050/KSNVN.2008.18.10.1014
Subway electric trains need to be faster for accommodation of long distance passengers. The faster run of the existing trains results in deterioration of ride quality due to noise and vibration. To reduce the noise and vibration of the electric train, a running test of the electric train was performed and an ADAMS/Rail model was set up to verify the running test results. The experimental results show that the sources of the cabin noise and vibration basically comes from the irregularity of the railroad track and the deterioration of the connection part between cabin and bogie. Consequently for mitigation of noise and vibration of the electric train, the redesign of the center pivot with softer stiffness and the minimization of rail irregularity are necessary. the frequent maintenance of the train will lead to better comport.
Vibration Analysis of a Rotating Cantilever Beam Undergoing Impulsive Force Using Wavelet Transform
Park, Ho-Young ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1024~1032
DOI : 10.5050/KSNVN.2008.18.10.1024
The vibration characteristics of a rotating cantilever beam undergoing impulsive force are investigated using wavelet transformation. The transient response induced by the impulsive force and the rigid body motion of the beam are calculated using hybrid deformation variable modeling along with the Rayleigh-Ritz assumed mode methods. The vibration characteristics of the beam can be analyzed in time-frequency domain with the wavelet transform method. Therefore, the effects of the impulsive force on the transient vibration characteristics of the beam can be investigated more effectively.
Vibration Analysis of Tapered Thick Plate with Concentrated Mass Subjected to In-plane Force on Elastic Foundation
Lee, Yong-Soo ; Kim, Il-Jung ; Oh, Soog-Kyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1033~1041
DOI : 10.5050/KSNVN.2008.18.10.1033
The purpose of this paper is to investigate natural frequencies of tapered thick plate with concentrated masses subjected to in-plane force on pasternak foundation by means of finite element method and providing kinetic design data for mat of building structures. Finite element analysis of rectangular plate is done by using rectangular finite element with 8-nodes. For analysis, plates is supported on pasternak foundation. The Winkler parameter is varied with 10, 102, the shear foundation parameter is 5. The taper ratio is applied as 0.0, 0.25, 0.5 and the ratio of the concentrated mass to plate mass as 0.25, 0.5 respectively. As results, we can see that when stiffener`s sizes or foundation parameter are larger, the natural frequency increases, and when the concentrated mass or taper ratio or in-plane stress is larger, the natural frequency decreases.
Analysis of the Front Disk Brake Squeal Using Kriging Method
Sim, Hyun-Jin ; Park, Sang-Gil ; Kim, Heung-Seob ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1042~1048
DOI : 10.5050/KSNVN.2008.18.10.1042
Disc brake noise is an important customer satisfaction and warranty issue for many manufacturers as indicated by technical literature regarding the subject coming from Motor Company. This research describes results of a study to assess disk brake squeal propensity using finite element methods and optimal technique (Kriging). In this study, finite element analysis has been performed to determine likely modes of brake squeal. This paper deals with friction-induced vibration of disc brake system under contact friction coefficient. A linear, finite element model to represent the floating caliper disc brake system is proposed. The complex eigen-values are used to investigate the dynamic stability and in order to verify simulations which are based on the FEM model. In this paper, Kriging from among the meta-modeling techniques is proposed for an optimal design scheme to reduce the brake squeal noise.
Finite Element Vibration Analysis of a Curved Pipe Conveying Fluid with Uniform Velocity
Lee, Seong-Hyeon ; Jeong, Weui-Bong ; Seo, Young-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1049~1056
DOI : 10.5050/KSNVN.2008.18.10.1049
A method for the vibration analysis of curved beam conveying fluid with uniform velocity was presented. The dynamics of curved beam is based on the inextensible theory. Both in-plane motion and out-of-plane motion of curved beam were discussed. The finite element method was formulated to solve the governing equations. The natural frequencies calculated by the presented method were compared with those by analytical solution, straight beam theories and Nastran. As the velocity of fluid becomes larger, the results by straight beam model became different from those by curved beam model. And it was shown that the curved beam element should be used to predict the critical velocity of fluid exactly. The influence of fluid velocity on the frequency response function was also discussed.
Effect of Boundary Conditions on the Stability Characteristics of Nanopipes
Choi, Jong-Woon ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1057~1064
DOI : 10.5050/KSNVN.2008.18.10.1057
In this paper, static and oscillatory instability of nanopipes conveying fluid and modelled as a thin-walled beam is investigated. Effects of boundary conditions and non-classical transverse shear and rotary inertia are incorporated in this study. The governing equations and the three different boundary conditions are derived through Hamilton`s principle. Numerical analysis is performed by using extend Galerkin method which enables us to obtain more exact solutions compared with conventional Galerkin method. Variations of critical flow velocity for different boundary conditions of carbon nanopipes are investigated and pertinent conclusion is outlined.
A Study on the Start-up Control for HDD Spindle Motors
Jeong, Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1065~1072
DOI : 10.5050/KSNVN.2008.18.10.1065
A HDD adopts a sensorless brushless DC (BLDC) motor as a spindle motor. Because there is no direct sensor measuring rotor position. open loop commutations with inductive sensing are used to increase the rotor speed up to a certain speed where the zero crossings of the back electromotive force (EMF) voltage are measurable. Therefore, successful open loop commutations are necessary for the stable start-up control of the spindle motors. In this paper, the time scale and the number of the open loop commutations are employed for design parameters to guarantee robustness to torque constant variation and initial rotor position. The design results are verified by experiments on a very low current start-up of the spindle motor with various environment. The experimental results show that the design results can decrease the start-up failure rate considerably.
A Study on Mount Vibration Reduction of a Centrifugal Turbo Blower for FCEV
Kim, Yoon-Seok ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1073~1081
DOI : 10.5050/KSNVN.2008.18.10.1073
A centrifugal turbo blower of the fuel cell electric vehicle (FCEV) operates at very high speed above 30000 rpm in order to increase the pressure of the air, which supplied to a stack of FCEV, using rotation of its impeller blades. Vibration which originated from the blower is generated by unbalance of mechanical components, rotation of bearings and rotating asymmetry that rotate at high speed. The vibration is transmitted to receiving structure through vibration isolators and it can causes serious problems in the noise, vibration and harshness(NVH) performance. Thus, the study about reducing this kind of vibration is an important task. In this paper, dynamic analysis of the blower executed by numerical simulation and experimental analysis of the blower is also performed. Then, measured and simulated results are compared in order to validate of the simulation. Finally, reducing vibration through modifying mount stiffness is the main purpose of this paper.
Development of Compliant and Dissipative Joints in Coupled Thin Plates for Vibrational Energy Flow Analysis
Song, Jee-Hun ; Hong, Suk-Yoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 10, 2008, Pages 1082~1090
DOI : 10.5050/KSNVN.2008.18.10.1082
In this paper, a general solution for the vibrational energy and intensity distribution through a compliant and dissipative joint between plate structures is derived on the basis of energy flow analysis (EFA). The joints are modeled by four sets of springs and dashpots to show their compliancy and dissipation in all four degrees of freedom. First, for the EFA, the power transmission and reflection coefficients for the joint on coupled plate structures connected at arbitrary angles were derived by the wave transmission approach. In numerical applications, EFA is performed using the derived coefficients for coupled plate structures under various joint properties, excitation frequencies, coupling angles, and internal loss factors. Numerical results of the vibrational energy distribution showed that the developed compliant and dissipative joint model successfully predicted the joint characteristics of practical structures vibrating in the medium-to-high frequency ranges. Moreover, the intensity distribution of a compliant and dissipative joint is described.