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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 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
A Study of Improvement on the Torsional Vibration of Input Shaft and Structural Vibration of Vehicle Using Tunable Dual Stiffness Type Clutch in Auto-transmission
Jung, Byung-Hwan ; Hwang, Seon-Yang ; Kang, Koo-Tae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 883~890
DOI : 10.5050/KSNVE.2010.20.10.883
According to torsional vibration characteristic of a tunable dual stiffness type clutch(TDSTC) in auto-transmission, the input shaft system have occurred breakdown for the duration cycle and over-vibration happened on vehicle at specific condition. This paper introduces the improvement of the torsional vibration of input shaft and the vehicle vibration by tuning of the TDSTC.
Subjective Responses to the Anti-noise Effect According to Different Types of Soundproof-protector
Kim, Dae-Goon ; Kim, Jae-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 891~899
DOI : 10.5050/KSNVE.2010.20.10.899
Since the working machine generates an excessive loud noise as much as its use-purpose and dimension, those damages are occurring to the exposed workers such as unpleasant sense, stress and occupational hearing-impaired. Accordingly, as one of the measures for prevention such loud noise, various soundproof protection tools were developed. However, such soundproof protection tools were presented the physical measured value only, it is real state that the psychological study result with regard to the soundproof effect which the workers are actually feeling, is not existing. On such point of view, with the object on the typical earplugs and earcaps among the soundproof protection tools, this study has ever tried a subjective evaluation about the degree of soundproof effect through Psycho-acoustics experiment. It is considering that such study result could be utilized as the useful material when establishing the soundproof measure for the workers in the future.
Vibration-free Control of Double Integrator Typed Motor via Loop Transfer Recovery
Suh, Sang-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 900~906
DOI : 10.5050/KSNVE.2010.20.10.900
This note proposes vibration-free motor control through modified LQG/LTR methodology. A conventional LQG/LTR method is a design tool in the frequency domain. However, unlike the conventional one, the proposed one is a time response based design method. This feature is firstly designed by parameterized settling time control gain through the target loop design procedure and the feature is secondly realized by loop transfer recovery. In order to show convergence to the target loop transfer functions, asymptotic behaviors of the open and the closed loop transfer functions are shown. At the conclusion, it is verified that the proposed method is robustly stable to parametric uncertainties through
Estimation of Dynamic Characteristics of a Rubber Component for Subframe in Automobile Vehicle
Ahn, Tae-Kil ; Goo, Jun-Hwan ; Kim, Joo-Sung ; Lee, Yong-Heon ; Kim, Kee-Joo ; Choi, Byung-Ik ; Lee, Hak-Joo ; Woo, Chang-Su ; Kim, Kyung-Shik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 907~914
DOI : 10.5050/KSNVE.2010.20.10.907
While rubber components are extensively used in automobile vehicle, there are still a lot of difficulties in designing the rubber components applied in complex shapes and preloaded states because of the complicated material properties. In this paper, an efficient experimental method is suggested, which estimates the dynamic stiffness of a rubber component using rubber material test and static stiffness of the bush. And it is verified by comparing with FEM predictions and experimental results. This method is capable of predicting the dynamic stiffness of a rubber bush under various load conditions from minimized test data. Also it estimates dynamic characteristics of a rubber component using rubber material test and FEM calculation.
Finite Element Forced Response of a Spinning Flexible HDD Disk-spindle System Considering the Asymmetry Originating from Gyroscopic Effect and Fluid Dynamic Bearings
Park, Ki-Yong ; Jang, Gun-Hee ; Seo, Chan-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 915~922
DOI : 10.5050/KSNVE.2010.20.10.915
This paper presents an efficient method for determining the forced response of a spinning flexible disk-spindle system supported by fluid dynamic bearings(FDBs) in a computer hard disk drive(HDD). The spinning flexible disk-spindle system is represented by the asymmetric finite element equations of motion originating from the asymmetric dynamic coefficients of the FDBs and the gyroscopic moment of a spinning disk-spindle system. The proposed method utilizes only the right eigenvectors of the eigenvalue problem to transform the large asymmetric finite element equations of motion into a small number of coupled equations, guaranteeing the accuracy of their numerical integration. The results are then back-substituted into the equations of motion to determine the forced response. The effectiveness of the proposed method was verified by comparing it with the responses from the classical methods of mode superposition with the general eigenvalue problems, and mode superposition with modal approximation. The proposed method was shown to be effective in determining the forced response represented by the asymmetric finite element equations of motion of a spinning flexible disk-spindle system supported by FDBs.
Comparison of Damping Matrix Estimation Methods for Model Updating
Lee, Gun-Myung ; Ju, Young-Ho ; Park, Mun-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 923~930
DOI : 10.5050/KSNVE.2010.20.10.923
Finite element models of dynamic systems can be updated in two stages. In the first stage, mass and stiffness matrices are updated neglecting damping, and in the second stage, damping matrices are estimated with the mass and stiffness matrices fixed. Three methods to estimate damping matrices for this purpose are proposed in this paper. The methods include one for proportional damping systems and two for non-proportional damping systems. Method 1 utilizes orthogonality of normal modes and estimates damping matrices using the modal parameters extracted from the measured responses. Method 2 estimates damping matrices from impedance matrices which are the inverse of FRF matrices. Method 3 estimates damping using the equation which relates a damping matrix to the difference between the analytical and measured FRFs. The characteristics of the three methods are investigated by applying them to simulated discrete system data and experimental cantilever beam data.
Study on Acoustical Radiation from Simplified Systems of a Dash Structure for NVH Performance
Lim, Cha-Sub ; Yoo, Ji-Woo ; Park, Chul-Min ; Jo, Jin-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 931~939
DOI : 10.5050/KSNVE.2010.20.10.931
A dash panel plays an important role to protect noise as well as heat. Meanwhile, it is also the most important path that transfers energy to the interior cavity, so that some of noises are transferred via air and its structural vibration becomes a major issue. From the viewpoint of NVH performance, simplified structures analogues to the dash wall are dealt with. Stiffeners, damping sheets and sound packages attached to a flat panel are taken into account as design variables. Structural radiation characteristics(thus, structure borne) such as radiation efficiency and radiation power are mainly discussed. For the case when an excitation is applied on a frame that surrounds the panel, it is shown that the radiation efficiency increases by attaching a stiffener to the panel, which is similarly found from the case when a panel is directly excited. It seems more effective to attach damping sheets along the boundary area of the panel rather than its middle area. The radiation efficiency of sound packages may make a dominant contribution to transmission loss as well as sound radiation. Experimental work was carried out to verify the results based on the simulation study.
Transfer Path Analysis of Output Noise Using Multi-dimensional Spectral Analysis Method for Vacuum Cleaner
Jeong, Jae-Eun ; Lee, Jung-Hwan ; Chung, Chang-Ook ; Hwang, Geun-Bae ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 940~945
DOI : 10.5050/KSNVE.2010.20.10.940
Noise reduction of vacuum cleaner is important, according as get into standard that estimate quality of product. To reduce noise of vacuum cleaner, we need analysis of correct noise source and contribution grasping about Identified noise sources' output noise. Because noise sources' correlation exists in vacuum cleaner that is small and complicated system, analysis is not easy. In this case, we need to apply Multi-dimensional spectral analysis(MDSA) method that can remove correlation between noise sources and grasp pure contribution degree of noise sources. In this study, we take transfer path analysis between output noise and noise that measured in inside/outside of vacuum cleaner.
Identification of Structural Characteristic Matrices of Steel Bar by Genetic Algorithm
Park, S.C. ; Je, H.K. ; Yi, G.J. ; Park, Y.B. ; Park, K.I. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 946~952
DOI : 10.5050/KSNVE.2010.20.10.946
A method for the identification of structural characteristic parameters of a steel bar in the matrices form such as stiffness matrices and mass matrices from frequency response function(FRF) by genetic algorithm is proposed. As the method is based on the finite element method(FEM), the obtained matrices have perfect physical meanings if the FRFs got from the analysis and the FRFs from the experiments were well coincident each other. The identified characteristic matrices from the FRFs with maximun 40 % of random errors by the genetic algorithm are coincident with the characteristic matrices from exact FEM FRFs well each other. The fitted element diameters by using only 2 points experimental FRFs are similar to the actual diameters of the bar. The fitted FRFs are good accordance with the experimental FRFs on the graphs. FRFs of the rest 9 points not used for calculating could be fitted even well.
Force Identification of a Rotary Compressor and Prediction of Vibration on a Pipe
Lee, Han-Wool ; Ryu, Sang-Mo ; Jeong, Weui-Bong ; Han, Hyung-Suk ; Ahn, Jae-Woo ; Jeong, Sang-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 953~959
DOI : 10.5050/KSNVE.2010.20.10.953
This paper deals with the process to identify the exciting forces generated from a rotary compressor. The equation of motion of a rigid compressor supported by several mounts was derived with 6 degree of freedom. The mass moment of inertia of compressor and the stiffness of rubber mounts were also identified by experiments. The exciting force at the center of mass of the compressor were estimated from the acceleration data measured at compressor shell. The piping system connected to the compressor was modeled. The acceleration of a pipe was predicted numerically by using the predicted exciting force. The numerical results showed good agreement with experimental results, which validated the identified exciting force.
Investigation of the Indoor Noise of Naval Vessel with Regarding to the Sound Absorption and Reverberation Time in a Cabin
Han, Hyung-Suk ; Park, Mi-Yoo ; Cho, Heung-Gi ; Kim, Joong-Gil ; Im, Dong-Been ; Son, Yoon-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 960~967
DOI : 10.5050/KSNVE.2010.20.10.960
The sound field can be classified to the direct, diffract and reverberant sound field. If the sound absorption material in a room is not applied sufficiently, the reverberant sound field increases and the sound pressure in a room also increases when the sound source exists in a room. Therefore, the reverberation time should be controled in order to reduce the reverberant sound as well as sound pressure level in a room. Even though the reverberation time is specified and researched widely in architectural engineering, it is rarely performed in a marine engineering. Therefore, in this research, the reverberation time in a navel vessel is researched related to the noise reduction in a cabin.
The Vibrational Evaluation of Railway Station by the Train Service
Kim, Byoung-Sam ; Lee, Tae-Keun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 968~975
DOI : 10.5050/KSNVE.2010.20.10.968
The high interest for the ground vibrations which is caused by the train service is risen. When the trains are passed, a serious force is applied to ground and the caused vibration is propagated to the area of the building by the ground and rocks. This vibration comes to feel in the residents with the direct vibration, it is radiated in sound. The caused vibration and radiated sound affect the human's life, and this vibration brings about the operation interruption of the equipment which is sensitive to the vibration, or will bring about the structural damage of the building. In this study, the effect of the vibrations caused by the passing trains on the railway station and buildings is investigated by vibration measurement. Indoor and outdoor measurement is carried out by each trains.
Dynamic Modeling and Pressure Control of Piezoactuator Based Valve Modulator Integrated with Flexible Flapper
Jeon, Jun-Cheol ; Maeng, Young-Jun ; Sohn, Jung Woo ; Choi, Seung-Bok ; Lee, Soo-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 976~982
DOI : 10.5050/KSNVE.2010.20.10.976
This paper proposes a novel type of pressure control mechanism which can apply to vehicle ABS (anti-lock braking system) utilizing the piezoactuator based valve system associated with the pressure modulator. As a first step, a flapper-nozzle of a pneumatic valve system is devised by integrating the piezoacuator to the flexible beam structure. The dynamic modeling of the valve system is then undertaken and subsequently the governing equation of pressure control is derived considering the pressure modulator. A sliding mode controller is designed in order to achieve accurate pressure tracking control in the presence of actuator uncertainty as well as input pressure variation. It is shown through computer simulation that an accurate pressure tracking for sinusoidal motion whose magnitude is 40 bar is achieved by utilizing the proposed pressure control mechanism.
Design of a Micro-perforated Panel Absorber at High Incident Sound Pressure
Park, Soon-Hong ; Seo, Sang-Hyun ; Jang, Young-Soon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 10, 2010, Pages 983~990
DOI : 10.5050/KSNVE.2010.20.10.983
Reduction of acoustic loads of space launch vehicles can be achieved by acoustic absorbers satisfying strict cleanness requirements. This limited the use of general porous materials and requires non-porous sound absorbers. Micro-perforated panel absorbers(MPPA) is one of promising sound absorbers satisfying the cleanness requirement for launch vehicles. However, its applicability was limited to low sound pressure levels according to the acoustic impedance model of micro-perforated panels. In this paper the applicability of micro-perforated panel absorbers at high incident sound pressure was investigated in experimental ways. The absorption characteristics of a micro-perforated panel absorber was simulated according to its design variables, e.g., minute hole diameters and aperture ratios. It was shown that optimal design can be readily done by using proposed design charts. Experiments were conducted to measure acoustic properties of the designed micro-perforated panel absorbers. The results showed that acoustic resistance increases rapidly as incident sound pressure level does but change of acoustic reactance can be neglected in a practical point of view. This caused the decrease of peak value of absorption coefficient at high incident sound pressure level, but the amount of reduction can be accepted in practice. The major advantage of the micro-perforated panel absorber(wide absorption bandwidth) was still kept at high sound pressure level.