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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 21, Issue 12 - Dec 2011
Volume 21, Issue 11 - Nov 2011
Volume 21, Issue 10 - Oct 2011
Volume 21, Issue 9 - Sep 2011
Volume 21, Issue 8 - Aug 2011
Volume 21, Issue 7 - Jul 2011
Volume 21, Issue 6 - Jun 2011
Volume 21, Issue 5 - May 2011
Volume 21, Issue 4 - Apr 2011
Volume 21, Issue 3 - Mar 2011
Volume 21, Issue 2 - Feb 2011
Volume 21, Issue 1 - Jan 2011
Selecting the target year
Development an Empirical Formula for the Friction Coefficient of a Circular Friction Damper
Shin, Yong-Woo ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 491~498
DOI : 10.5050/KSNVE.2011.21.6.491
The structural vibration due to earthquake or outside impact causes serious problem for building safety. A dynamic model of a friction damper which can be constructed and installed easily is needed to reduce the vibration of the building. In this paper, the experimental equation of a circular friction damper is derived and designed for reduction of a earthquake vibration of a building. The developed experimental equation is defined to simply design the capacity on design of the circular friction damper based on the results of the performance test. Finally this experimental equation can be used for the design of a circular friction damper.
Optimal Design of MR Suspension Unit for Tracked Vehicle
Ha, Sung-Hoon ; Kim, Hyung-Seob ; Choi, Seung-Bok ; Woo, Je-Kwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 499~505
DOI : 10.5050/KSNVE.2011.21.6.499
This paper presents optimal design of controllable magnetorheological suspension unit for a tracked vehicle. As a first step, a double-rod type MR suspension unit is designed on the basis of the Bingham model of commercially available MR fluid, and its damping characteristics are evaluated with respect to the intensity of the magnetic field. Subsequently, the governing equation of motion of the MR suspension system featuring the MR valve is established. Then, the optimization problem to find optimal geometric dimensions of the MR supension unit is formulated by considering an objective function which is related to damping torque and control energy. The first order optimization method intergrated with a commercial finite element method(FEM) software is adopted to obtain optimal solution of the system. The performance characteristics of the optimized MR susepnsion unit is then evaluated and compared with initial one.
A Study on the Application of the Cutout Piston for the Improvement of the MR Damper's Control Effect
Kim, Jong-Hyuk ; Bae, Jae-Sung ; Hwang, Jai-Hyuk ; Hong, Yeh-Sun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 506~513
DOI : 10.5050/KSNVE.2011.21.6.506
This paper is concerned with a study on the control effect of the MR damper using the cutout piston. The MR damper has passive damping force by the oil pressure and controllable damping force by the magnetic effect. As the velocity of the MR damper's piston increases the passive damping force increases and the ratio of the controllable damping force to the total damping force is decreased. Consequently, the control performance of the MR damper is reduced according to the increase of the velocity. In this paper, the cutout piston concept is applied to the MR damper to improve MR damper's control performance by reducing the passive damping effect. The MR damper with the cutout piston has been designed and manufactured and its hydraulic and electromagnetic analysis has been performed to predict its performance. The control performances of the MR damper with the cutout piston are verified through the comparison of experiment results and simulation results.
Eigenvalue Analysis of a Coupled Tower-blade System Considering the Shear Forces of a Nacelle
Kim, Min-Ju ; Kang, Nam-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 514~520
DOI : 10.5050/KSNVE.2011.21.6.514
Eigenvalue analysis of a wind turbine system was investigated analytically. It is derived that the equations of motion of a tower and a blade are coupled by shear forces inter-connected by boundary conditions. The eigenvalues of the coupled system was calculated using Galerkin method and it is found that the system becomes unstable when the tower and blade modes are coalesced. Further, parameter studies for the eigenvalues were performed with respect to the rotating speed of a blade, nacelle mass, blade and tower densities.
Vector Base Amplitude Panning Based Noise Control Method for Improving the Amenity in Building Environment
Kwon, Byoung-Ho ; Park, Young-Jin ; Park, Youn-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 521~528
DOI : 10.5050/KSNVE.2011.21.6.521
A variety of noise control methods have been developed as an interest on noise issues increases. Among them, noise control methods using masking effect, a phenomenon to reduce the ability to notice the unwanted sound by proper sound, to implement a pleasant sound environment have been studied under the name of soundscape. We proposed a novel vector base amplitude panning(VBAP) based noise control method to apply to the building environment. The proposed method could improve the amenity inside the building to reproduce the sounds with excellent masking effect on the incoming path of noise using the control speakers, considering the direction of noise source. The directional masking sounds can be generated by using VBPA technique. To verify the performance of the proposed method, we carried out the subjective test for the degree of amenity according to direction of the masking sound. Subjective test results showed that it is possible to improve the amenity inside the building by controlling the direction of masking sound considering the human's auditory characteristic.
Design of the Plenum Chamber for Reducing Cooling Fan Noise of the Console for Combat Systems in a Naval Vessel
Han, Hyung-Suk ; Park, Mi-Yoo ; Cho, Heung-Gi ; Kim, Joong-Gil ; Im, Dong-Been ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 529~535
DOI : 10.5050/KSNVE.2011.21.6.529
Indoor noise is very important related to the morale and fighting power of the crew as well as environmental condition for them in a navel vessel. Especially, the crew members working in CIC (combat information center) and sonar equipment room require much more quiet environment condition. One of the most serious noise source in CIC is the cooling fan noise installed in the console of the combat system. Therefore, in this paper, the design of the plenum chamber is studied to reduce the noise of the fan from these consoles by numerical analysis and experiment.
Dynamic Characteristics of Composite Plates Subjected to Electromagnetic and Thermal Fields
Kim, Sung-Kyun ; Lee, Kune-Woo ; Moon, Jei-Kwon ; Choi, Jong-Woon ; Kim, Young-Jun ; Park, Sang-Yun ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 536~545
DOI : 10.5050/KSNVE.2011.21.6.536
Structural model of laminated composite plates based on the first order shear deformable plate theory and subjected to a combination of magnetic and thermal fields is developed. Coupled equations of motion are derived via Hamilton's principle on the basis of electromagnetic equations (Faraday, Ampere, Ohm, and Lorentz equations) and thermal ones which are involved in constitutive equations. In order to reveal the implications of a number of geometrical and physical features of the model, free vibration of a composite plate immersed in a transversal magnetic field and subjected to a temperature gradient is considered. Special coupling effects between the magnetic-thermal-elastic fields are revealed in this paper.
A Study on Noise Reduction for an Industrial Right-angled Reducer
Seo, Hong-Seung ; Park, Sung-Pil ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 546~552
DOI : 10.5050/KSNVE.2011.21.6.546
In this study, noise sources of a reducer which is combined a spiral bevel gear and a planocentric gear are identified by experimental method and the noise was reduced by the structure modification of the reducer. In order to identify the noise sources, noise and vibration signals were measured by microphone and accelerometer and these signals were analyzed with waterfall plot. In addition, the frequency response functions were obtained to prove the noise and vibration sources. It was found that the resonance was generated by the gear mesh frequencies and natural frequency of the reducer. The noise of the reducer could be reduced by structure modification.
Damping Characteristics of a Microcantilever for Radio Frequency-microelectromechanical Switches
Lee, Jin-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 553~561
DOI : 10.5050/KSNVE.2011.21.6.553
A theoretical approach is carried out to predict the quality factors of flexible modes of a microcantilever on a squeeze-film. The frequency response function of an inertially-excited microcantilever beam is derived using an Euler-Bernoulli beam theory. The external force due to squeeze-film phenomenon is developed from the Reynolds equation. Slip boundary conditions are employed at the interfaces between the fluid and the structure to consider the gas rarefaction effect, and pressure boundary condition at both ends of fluid analysis region is enhanced to increase the exactness of predicted quality factors. To the end, an approximate equation is derived for the first bending mode of the microcantilever. Using the approximate equation, the quality factors of the second and third bending modes are calculated and compared with experimental results of previously reported work. The comparison shows the feasibility of the current approach.
Identification of Linear and Nonlinear Dynamic Stability Characteristics of a Medium-size High-speed Turbocharger Rotor Supported by 3-lobe Bearings
Lee, An-Sung ; Kim, Byung-Ok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 562~569
DOI : 10.5050/KSNVE.2011.21.6.562
In this study linear and nonlinear dynamic stability characteristics of a medium-size high-speed turbocharger, whose rotor is supported by two 3-lobe journal bearings, are analyzed to evaluate and identify the effects of its bearing design variables. The rotor has the rated speed of 40,500 rpm and maximum continuous speed of 45,000 rpm. At first, utilizing the linear stability analysis method, bearing designs of yielding stable or unstable LogDecs as small as possible are searched by manipulating with machined bearing clearances and preloads. As next, utilizing the nonlinear analysis method, limit cycles of the rotor responses at the rated and maximum continuous speeds are simulated to check their acceptances. Results have shown that for the turbocharger rotor-bearing system considered, the 3-lobe journal bearing design with a smaller machined clearance and a larger preload are preferred for the stable rotor responses. More importantly, since there exists a good correlation between the linear and nonlinear stability analysis results, it is concluded that firstly the linear stability analysis method may be applied to screen quickly the ranges of bearing designs for stable or least unstable solutions and then, lastly the nonlinear stability analysis method may be deployed to check an absolute motion stability in terms of the limit cycle.
Free Vibrations of Circular Curved Beams with Constant Volume
Lee, Byoung-Koo ; Lee, Tae-Eun ; Choi, Jong-Min ; Park, Chang-Eun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 570~579
DOI : 10.5050/KSNVE.2011.21.6.570
This paper deals with free vibrations of the circular curved beams with constant volume, whose cross sectional shapes are the circular solid cross-sections. Volumes of the objective beam are always held in constant regardless shape functions of the cross-sectional radius. The shape functions are chosen as the linear, parabolic and sinusoidal ones. Ordinary differential equations governing free vibrations of such beam are derived and solved numerically for determining the natural frequencies. In numerical examples, the hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered. As the numerical results, relationships between frequency parameters and various beam parameters such as rise ratio, section ratio, elasticity ratio, volume ratio, slenderness ratio and taper type are reported in tables and figures.
Effect of Axial Loads on Natural Frequencies of Timoshenko Beam
Koo, Kyo-Nam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 6, 2011, Pages 580~586
DOI : 10.5050/KSNVE.2011.21.6.580
This paper addresses the effect of transverse shear deformation and rotary inertia on the natural frequency of beams under axial loads. It has been reported in the author's paper using a finite element analysis that the Timoshenko effect in a rotating disk deceases and then increases again with increasing rotation speed. To validate the phenomenon, the simply-supported beams under uniform tension are selected in this study since they have exact solutions in vibration problem. The results show that the axial tension in beams would not make the Timoshenko effect decrease monotonically but could make the effect increase again unlike the results reported in the other studies for beams.