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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 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
Impedance Analysis of Ship Equipment Foundation and Its Verification
Lee, Doo-Ho ; Kim, Bong-Ki ; Byun, Joung-Woo ; Kim, Hyun-Sil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 393~399
DOI : 10.5050/KSNVE.2011.21.5.393
An empirical formula proposed by Petersson and Plunt(PP`s formula) and finite element analysis for impedance calculation of ship equipment foundations are investigated by comparing the analysis results with those of experimental results. The PP`s formula well estimates resonant frequency of the foundations and impedance level except around the resonant region although the impedance level around the resonant frequency is heavily dependent upon the assumed loss factor. The results show that the PP`s formula and finite element models can be complementarily used to estimate the impedance characteristics of various types of foundation of ships in design stage.
Railway Noise Exposure-response Model based on Predicted Noise Level and Survey Results
Son, Jin-Hee ; Lee, Kun ; Chang, Seo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 400~407
DOI : 10.5050/KSNVE.2011.21.5.400
The suggested method of previous Son`s study dichotomized subjective response data to modeling noise exposure-response. The method used maximum liklihood estimation instead of least square estimation and the noise exposure-response curve of the study was logistic regression analysis result. The method was originated to modeling community response rate such as %HA or %A. It can be useful when the subjective response was investigated based on predicted noise level. It is difficult to measure the single source emitting noise such as railway because various traffic noise sources combined in our life. The suggested method was adopted to model in this study and railway noise-exposure response curves were modeled because the noise level of this area was predicted data. The data of this study was used by previous Ko`s paper but he dealt the area as combined noise area and divided the data by dominant noise source. But this study used all data of this area because the annoyance response to railway noise was higher than other noise according to the result of correlation analysis. The trend of the %HA and %A prediction model to train noise of this study is almost same as the model based on measured noise of previous Lim`s study although the investigated areas and methods were different.
A Study on the Vibration Damping of a Barrel Using Vibration Absorber
Kwag, Dong-Gi ; Bae, Jae-Sung ; Hwang, Jai-Hyuk ; Kim, Hun-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 408~415
DOI : 10.5050/KSNVE.2011.21.5.408
Advanced tanks in the future combat system are expected to have the trends of large caliber, high explosive shell and light weight for destructive power and improvement in mobility. Their guns are required to have longer barrels to meet increased muzzle exit velocities. However, as the length of the barrel is extended, the vibrations induced by the breech forces in fire and the terrain lead to increased muzzle pointing errors. Therefore, the fire-induced and terrain-induced vibrations must be attenuated. A method to reduce these vibrations without the significant increase of the gun mass is to use the forward thermal shroud as part of a tuned mass damper. In this study, the dynamically-tuned-shroud using this shroud and leaf springs is introduced and its effectiveness on the vibration attenuations of the barrel are verified. The parametric studies on the stiffness of these leaf springs are performed and the analytical results are verified using the experimental model of the dynamically-tuned-shroud.
Nonlinear Dynamic Analysis of a Tethered Satellite
Lee, Kyu-Ho ; Jung, Won-Young ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 416~421
DOI : 10.5050/KSNVE.2011.21.5.416
The purpose of this study is to analyze nonlinear dynamics of a tethered satellite. The nonlinear equations of motion are derived by using Lagrange`s equations with the polar coordinate system. In order to analyze the response of tethered satellite, time responses are computed by the Newmark`s time integration method. This paper claims that the dynamic behavior of the system is changed by the effect of length of tether, mass ratio of satellites.
Critical Fluid Velocity of Fluid-conveying Cantilevered Cylindrical Shells with Intermediate Support
Kim, Young-Wann ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 422~429
DOI : 10.5050/KSNVE.2011.21.5.422
The critical fluid velocity of cantilevered cylindrical shells subjected to internal fluid flow is investigated in this study. The fluid-structure interaction is considered in the analysis. The cantilevered cylindrical shell is supported intermediately at an arbitrary axial position. The intermediate support is simulated by two types of artificial springs: translational and rotational spring. It is assumed that the artificial springs are placed continuously and uniformly on the middle surface of an intermediate support along the circumferential direction. The steady flow of fluid is described by the classical potential flow theory. The motion of shell is represented by the first order shear deformation theory (FSDT) to account for rotary inertia and transverse shear strains. The effect of internal fluid can be considered by imposing a relation between the fluid pressure and the radial displacement of the structure at the interface. Numerical examples are presented and compared with existing results.
An Analysis of Vibration and Sound Radiation of Sandwich Panels Using the Rayleigh-Ritz Method
Kim, Dong-Kyu ; Kim, Jae-Hyun ; Jeon, Jin-Yong ; Park, Jun-Hong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 430~436
DOI : 10.5050/KSNVE.2011.21.5.430
The purpose of this study is to analyze the vibration and sound generation characteristics of the sandwich panel. Two thick panels were assumed to be separated by a compliant viscoelastic core. The transverse vibration induced by an external impact was analyzed using the Rayleigh-Ritz method. For applying arbitrary boundary condition of the panels, the edges were assumed to be supported by the translational and rotational springs. The beam functions were used as the trial functions. The effect of the boundary condition and viscoelastic core on the resulting vibration characteristics was investigated. The radiated sound power was analyzed using the proposed numerical model and the Rayleigh integral. The dynamic properties of the core and the mass-stiffness-mass resonance frequency had significant influence on the impact sound.
Self Noise Analysis of Towed Array Sonar Induced by Axisymmetric Vibrations Propagating Along Fluid-filled Elastic Hoses
Ryue, Jung-Soo ; Shin, Hyun-Kyung ; Ahn, Hyung-Taek ; Kwon, Oh-Cho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 437~446
DOI : 10.5050/KSNVE.2011.21.5.437
Performance of array sonars towed underwater is limited due to the self-noise induced mainly by the strumming vibration of the towing cable and also turbulent flow around the acoustic sensor module. The vibration of the towing cable generates axisymmetric waves that propagate along the acoustic module of the array sonar and produce self-noise. The present study aims to investigate the characteristics of the self-noise induced by the axisymmetric vibrations of the acoustic module. The waves of interest are the bulge and extensional waves propagating along the fluid-filled elastic hose. Dispersion relations of these waves are predicted by means of the numerical simulation to evaluate the wave speeds. The self-noise induced by the axisymmetric waves are formulated taking into account the damping of the elastic hose and the effect of the damping is investigated.
Active Vibration Control of Clamped Beams Using Filtered Velocity Feedback Controllers
Shin, Chang-Joo ; Hong, Chin-Suk ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 447~454
DOI : 10.5050/KSNVE.2011.21.5.447
This paper reports a filtered velocity feedback(FVF) controller, which is an alternative to direct velocity feedback(DVFB) controller. The instability problems due to high frequency response under DVFB can be alleviated by the suggested FVF controller. The FVF controller is designed to filter out the unstable high frequency response. The FVF controller and the dynamics of clamped beams under forces and moments are first formulated. The effects of the design parameters(cut-off frequency, gain, and damping ratio) on the stability and the performance are then investigated. The cut-off frequency should be selected not to affect the system stability. The magnitude of the open loop transfer function(OLTF) at the cut-off frequency should be small. As increasing the gain of the FVF controller, the magnitude of the OLTF is increased, so that the closed loop response can be reduced more. The enhancement of the OLTF at the cut-off frequency is reduced but the phase behavior around the cut-off frequency is distorted, as the damping ratio is increased. The control performance is finally estimated for the clamped beam. More than 10 dB reductions in velocity response can be achieved at the modal frequencies from the first to eighth modes.
Evaluation of Vibration Control Performance for Active Hybrid Mount System : Experimental Investigation
Oh, Jong-Seok ; Choi, Seung-Bok ; Nguyen, Vien Quoc ; Moon, Seok-Jun ; Choi, Sang-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 455~460
DOI : 10.5050/KSNVE.2011.21.5.455
In this work, an active hybrid mount using piezostack actuator and rubber element is manufactured, and its vibration control performance is evaluated via feedforward control. A hybrid active mount featuring inertia type of piezostack actuator is proposed and manufactured. After describing the configuration of the hybrid mount, a mount system is then constructed. To attenuate vibrations from vibration sources, a feedfoward controller is experimentally implemented to the system. Vibration control performances are evaluated at each mount. Effective control performances such as accelerations are obtained and presented in frequency domains.
Development of Numerical Analysis Model to Estimate the Contact Force between the Pantograph and Catenary of a High-speed Train
Jung, Sung-Pil ; Park, Tae-Won ; Kim, Young-Guk ; Paik, Jin-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 461~467
DOI : 10.5050/KSNVE.2011.21.5.461
This study aims to create a numerical analysis model which can investigate the dynamic interaction between pantograph and overhead contact wire used for a high-speed railway vehicle, and validate the simulation results according to EN 50318 standard. Finite element analysis models of pantograph and overhead contact line are created using SAMCEF, a commercial FE analysis program. The mean, standard deviation, maximum and minimum values of contact forces are obtained. The simulation results are validated according to EN 50318, and the possibility of simulating the collecting characteristic of an actual pantograph system by using the developed model is discussed.
Prediction of Marine Propeller Noise Considering Scattering Effect
Kim, Jong-Do ; Hong, Suk-Yoon ; Song, Jee-Hun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 468~474
DOI : 10.5050/KSNVE.2011.21.5.468
Underwater radiated noises from marine vehicles are mostly due to the propulsion systems. Recently, the propeller noise problems are becoming crucial issues in terms of habitability of passenger ships. Especially in military area, propeller noise is directly related to the survivability of submarines and warships, and thus propeller noise analysis and reductions are very important. Generally, propeller noise can be classified into non-cavitating noise and cavitating noise which is dominant. In this paper the methodology of propeller noise analysis is announced and new approach to consider scattering effect is proposed. Unsteady blade surface pressure and sheet cavity volume analyzed with potential based panel method are used as noise source.
A Study on the Development of a Hybrid Electromagnetic Actuator Against Microvibration
Moon, S.J. ; Park, S.H. ; Jeong, J.A. ; Huh, Y.C. ; Kim, C.H. ; Choi, S.M. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 5, 2011, Pages 475~483
DOI : 10.5050/KSNVE.2011.21.5.475
A hybrid electromagnetic actuator with an air mount is designed so as to achieve the desired isolation reduce the vibration efficiency on the floor vibration. The performance specification of the hybrid electromagnetic actuator is determined based on the vibration criterion for vibration-sensitive equipment. In the design stage of the electromagnetic actuator, the simple reluctance method is adapted to analyze magnetic circuits. The result is verified by finite element analysis using ANSYS Emag. Finally, in order to confirm the design performance, a dynamic characteristic test is carried out for the prototype of a hybrid electromagnetic actuator.