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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 17, Issue 12 - Dec 2007
Volume 17, Issue 11 - Nov 2007
Volume 17, Issue 10 - Oct 2007
Volume 17, Issue 9 - Sep 2007
Volume 17, Issue 8 - Aug 2007
Volume 17, Issue 7 - Jul 2007
Volume 17, Issue 6 - Jun 2007
Volume 17, Issue 5 - May 2007
Volume 17, Issue 4 - Apr 2007
Volume 17, Issue 3 - Mar 2007
Volume 17, Issue 2 - Feb 2007
Volume 17, Issue 1 - Jan 2007
Selecting the target year
Deceleration Method of Munition to used Soft Recovery System for Smart Munition
Kim, Myoung-Gu ; Cho, Chong-Du ; Lee, Seung-Su ; Yu, Il-Young ; Chang, Kwe-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 777~784
DOI : 10.5050/KSNVN.2007.17.9.777
With the development of micro electronic circuits and optical equipment, the demand for developing smart munitions with the ability to autonomously search for and attack targets has increased. Since the electronic components within smart munitions are affected by high temperatures, pressure, and impulsive forces upon the combustion of gunpowder, stability and reliability need to be secured for them. Securing those stability and reliability requires soft recovery system which can decelerate smart munitions. A theoretical analysis of flow is performed for the secure recovery of bullets on the basis of Euler equation for compressible fluids. The inner pressure on a pressure tube, the speeds of bullets, and the deceleration of munitions are calculated theoretically. Theoretical results are compared with the data from the experiment with soft recovery system set up at the laboratory.
Study of the Non-linearity of Cable Damper to Enhance Damping Performance of Stay Cable
Seo, Ju-Won ; Koh, Hyun-Moo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 785~796
DOI : 10.5050/KSNVN.2007.17.9.785
This study offers a design procedure of optimum cable damper for multi-mode vibration control with nonlinear damper and also investigates the relation between mode and amplitude dependency. The proposed multi-mode damping index, which is defined as a potential energy loss ratio of cable vibration, is a main component of optimization problem of optimum nonlinear damper. In order to include the amplitude dependency of nonlinear damper, three types of multi-mode patterns such as ambient vibration, support excitation and rain-wind induced vibration are assumed. The optimum damper exponent depends on amplitude patterns. In case of ambient vibration, optimum factor is less than 0.5 and in case of support excitation or rain-wind induced vibration it is between 0.5 and 1.0.
Structural-acoustic Coupled Analysis of Buried Hydrophone System
Seo, Hee-Seon ; Cho, Yo-Han ; Joh, Chee-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 797~804
DOI : 10.5050/KSNVN.2007.17.9.797
A study was carried out to investigate the fluid-structure interaction phenomena of buried hydrophone system that exposed complex loads due to handling, transportation and installation. The buried hydrophone system has necessarily neighborhood structures for installation. Because of the neighborhood structure, acoustic field is deformed. We analyze the piezoelectric-structural-acoustic coupled problem and the results to use a finite element analysis software, ANSYS, which has an coupled field analysis capability. The effect of the component of hydrophone system is revealed altogether in pressure distribution. So, we classify and analyze the problem by four different compositions for decomposition.
A Robust Controller Design Method of the Fine Seek Control System with Velocity Disturbance
Lee, Moon-Noh ; Shin, Jin-Ho ; Kim, Seong-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 805~812
DOI : 10.5050/KSNVN.2007.17.9.805
This paper present a robust controller design method based on the estimation of velocity disturbance to construct a robust fine seek control system. A loop gain adjustment algorithm is introduced to accurately estimate the velocity disturbance in spite of the uncertainties of fine actuator. A weighting function is optimally selected from a minimum fine seek open-loop gain, calculated by estimating the velocity disturbance. A robust fine seek controller is designed by considering a robust
control problem using the weighting function. The proposed controller design method is applied to the fine seek control system of a DVD rewritable drive and is evaluated through the experimental results.
An study on the Effects of Visual and Aural Information on Environmental Sound Amenity Evaluation
Shin, Hoon ; Baek, Kun-Jong ; Song, Min-Jeong ; Jang, Gil-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 813~818
DOI : 10.5050/KSNVN.2007.17.9.813
This study aims to know the effect of road traffic noise perception when the visual and aural information is added in a laboratory experiment. ME (magnitude estimation) and SD (semantic differential method) evaluation on the effect of visual and aural effect were carried out by 43 university students. As the result, up to 10 % of psychological reduction effect was shown under the 65 dB(A). As the noise level, it was analyzed that the vision affected about 7 dB(A) and sound affected 5 dB(A). However, if these two are given simultaneously, mainly sound affects to reduce the annoyance of noise and the vision next. Compared with the urban central circumstances, this effect (2 dB(A) under 65 dB(A) noise) was shown smaller than field test.
Vibration Characteristic Analysis of a Duel-cooled Fuel Rod according to the Cross-sectional Dimensions and the Span Length
Lee, Kang-Hee ; Kim, Jae-Yong ; Lee, Yung-Ho ; Yoon, Kyung-Ho ; Kim, Hyung-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 819~825
DOI : 10.5050/KSNVN.2007.17.9.819
Vibration characteristics of an duel-cooling cylindrical fuel rod, which was proposed as a candidate design of fuel's cross section for the ultra-high burnup nuclear fuel, according to the cross-sectional dimensions and the number of supports or the span length were analytically studied. Finite element(FE) modeling for the annular cross sectional fuel was based on the methodology, that have been proven by the test verification, for the conventional PWR nuclear fuel rod. A commercial FEA code, ABAQUS, was used for the FE modeling and analysis. A planar beam element (B21) that uses a linear interpolation was used for the fuel rod and a linear spring element for the spring and dimple of the SG. Natural frequencies and mode shape were calculated according to the preliminary design candidates for the fuel's cross sectional dimension and the number of span. From the analysis results, the design scheme of the annular fuel compatible to the present PWR nuclear reactor core was discussed in terms of the number of supports and fuel's cross section.
High Vibration Phenomena due to Cylinder Explosion Pressure of Low-speed Diesel Engine with 7 Cylinders installed on Land
Kim, Yeon-Wahn ; Bae, Yong-Chae ; Bae, Chun-Hee ; Lee, Young-Shin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 826~834
DOI : 10.5050/KSNVN.2007.17.9.826
A 7K60MC-S low speed diesel engine in a power plant has frequently experienced high vibration since the unit completed construction works. Up to date, no fundamental vibration solutions were reached. Hence, several vibration tests and analyses were conducted to identify the root cause of this high vibration and to suggest the optimal countermeasures for diesel engine. The 9.25 Hz and 25.4 Hz vibrations have been observed on main body during operation. The magnitude of engine upper structural vibration is generally similar in horizontal transverse direction. However, differences in the 'Fore' and 'After' vibration magnitude with the same vibration phase angle at 9.25 Hz occur due to the explosion pulsations of 7 cylinders and the Inertia momentum added by the SCR (selective catalytic reduction) duct system. It was analyzed that the excess structural vibration occurred when the natural frequency of engine body is affected by the exciting sources due to the explosion pressure and the discharge pulsation of the seven cylinders in resonance range.
Parametric Studies of Flexural Free Vibrations of Circular Strip Foundations with Various End Constraints Resting on Pasternak Soil
Lee, Byoung-Koo ; Li, Guang-Fan ; Kang, Hee-Jong ; Yoon, Hee-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 835~846
DOI : 10.5050/KSNVN.2007.17.9.835
This paper deals with the flexural free vibrations of circular strip foundation with the variable breadth on Pasternak soil. The breadth of strip varies with the linear functional fashion, which is symmetric about the mid-arc. Differential equations governing flexural free vibrations of such strip foundation are derived, in which the elastic soil with the shear layer, i.e. Pasternak soil, is considered. Effects of the rotatory and shear deformation are included in the governing equations. Differential equations are numerically solved to calculate the natural frequencies and mode shapes. In the numerical examples, the hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered. Four lowest frequency parameters accompanied with their corresponding mode shapes are reported and parametric studies between frequency parameters and various system parameters are investigated.
Effect of Harmonic Components on the Resonance of Bearing Casing Structures in a Turbine Rotor System
Song, Oh-Seop ; Yang, Kyeong-Hyeon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 847~852
DOI : 10.5050/KSNVN.2007.17.9.847
Design aspects of a bearing casing system of a power plant are mainly focused on the strength and weight of itself to have a more stable system. Since the rotor speed often passes through the critical speed region when the operation begins, the relation between the rotating frequency of the rotor and natural frequency of the casing is very important for a prevention of resonance. However, harmonic components above the rotating frequency have often been overlooked the design for the resonance avoidance. In this paper, it is revealed that resonance vibration is generated when the natural frequency of a bearing casing is close to the one of harmonics of basic rotating frequency(1x), and as a consequence, sensing qualify of seismoprobes attached to the bearing casing structure can be seriously damaged. In order to reduce the resonance vibration, some stiffeners are added to the casing structures. Significant reduction in the magnitude of vibration corresponding to 2x harmonic of basic rotating frequency is observed from both FE analysis and experiment.
A Study on the Dynamic Characteristics of Door Module Plate
Bae, Chul-Yong ; Kim, Wan-Su ; Kim, Chan-Jung ; Lee, Bong-Hyun ; Jang, Woon-Sung ; Mo, Yu-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 853~861
DOI : 10.5050/KSNVN.2007.17.9.853
Currently, automotive industries improve the vehicle performance and reduce the development period of vehicle using each module part for the high quality and performance of vehicles. However each component part doesn't generate the noise and vibration problems, sometime these problems are generated on the assembly status between vehicle chassis frame and each module part. On this study, in order to analysis the dynamic characteristics of a shield door module that is a typical module part of vehicles, the acquisition and evaluation process about the vibration and noise of shield door module is developed. Also the possibility to apply to shield door module of the developed process is verified by the comparison with the dynamic characteristics between plastic and steel module plate.
Shaking Table Test of a Full Scale 3 Story Steel Frame with Friction Dampers
Bae, Chun-Hee ; Kim, Yeon-Whan ; Lee, Sang-Hyun ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 862~873
DOI : 10.5050/KSNVN.2007.17.9.862
Energy dissipation devices can be considered as an alternative for the seismic performance enhancement of existing structures based on the strengthened seismic design code. In this study, seismic response mitigation effects of friction dampers are investigated through the shaking table test of a full scale 3 story building structure. Frist, the bilinear force-displacement relationship of a structure-brace-friction damper system and the effect of brace-friction damper on the increase of frequency and damping ratio are identified. Second, frequency, displacement, and torque dependent characteristics of the friction damper are investigated by using harmonic load excitation tests. Finally, the shaking table tests are performed for a full scale 3 story steel frame. System identification results using random signal excitation indicated that brace-friction damper increased structural damping ratio and frequency, and El Centro earthquake test showed that brace-friction damper reduced the peak displacement and acceleration significantly. In particular, it was observed that the damping effect due to friction damper becomed obvious when the structure was excited by more intensive load causing frequent slippage of the friction dampers.
A Study on the Establishments of Aircraft Noise Abatement Procedures in Gimpo International Airport
Son, Jung-Gon ; Kim, Yeon-Myung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 874~880
DOI : 10.5050/KSNVN.2007.17.9.874
The final purpose of this study is to develop noise abatement procedures for minimizing the environmental impacts caused by aircraft noise in the vicinity of Gimpo Int'l Airport, and to establish appropriate noise limits and monitoring system. The results of study was suggests for more detail the crucial factors which one is reference noise level,
at 6.5 km after take-off, and second one is to installation the additional three(3) noise monitoring system on both side of runway.
Free Vibration Analysis of Rectangular Plate with Multiple Rectangular Cutouts by Independent Coordinate Coupling Method
Kwak, Moon-K. ; Song, Myung-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 881~887
DOI : 10.5050/KSNVN.2007.17.9.881
This paper is concerned with the vibration analysis of a rectangular plate with multiple rectangular holes. Even though there have been many methods developed for the addressed problem, they suffer from computational time. In this paper, we applied the Independent Coordinate Coupling Method(ICCM) to the addressed problem, which was developed to compute natural vibration characteristics of the rectangular plate with a rectangular hole and proven to be computationally effective. The ICCM is based on Rayleigh-Ritz method but utilizes independent coordinates for each hole domain. By matching the deflection conditions for each hole imposed on the expressions, we can easily derive the reduced mass and stiffness matrices. The resulting equation is then used for the calculation of the eigenvalue problem. The numerical results show the efficacy of the Independent Coordinate Coupling Method.
The Effect of the Disturbing Wave on the Speech Intelligibility of the Eavesdropping Sound of a Window Glass
Kim, Seock-Hyun ; Kim, Hee-Dong ; Heo, Wook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 17, issue 9, 2007, Pages 888~894
DOI : 10.5050/KSNVN.2007.17.9.888
The speech sound is detected by the vibration measurement of the window glass. In this study, we investigate the effect of the disturbing waves by background noise and window shaker excitation on the speech intelligibility of the detected sound. Based upon Modulation Transfer Function(MTF), speech intelligibility of the sound is objectively estimated by Speech Transmission Index(STI) As the level of the disturbing wave varies, variation of the speech intelligibility is examined. Experimental result reveals how STI is influenced by the level and frequency characteristics of the disturbing wave. By using a customized window shaker for disturbing sound, we evaluate the efficiency and the frequency characteristics of the anti-eavesdropping system. The purpose of the study is to provide useful information to prevent the eavesdropping through the window glass.