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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 19, Issue 12 - Dec 2009
Volume 19, Issue 11 - Nov 2009
Volume 19, Issue 10 - Oct 2009
Volume 19, Issue 9 - Sep 2009
Volume 19, Issue 8 - Aug 2009
Volume 19, Issue 7 - Jul 2009
Volume 19, Issue 6 - Jun 2009
Volume 19, Issue 5 - May 2009
Volume 19, Issue 4 - Apr 2009
Volume 19, Issue 3 - Mar 2009
Volume 19, Issue 2 - Feb 2009
Volume 19, Issue 1 - Jan 2009
Selecting the target year
Efficient Super-element Structural Vibration Analyses of a Large Wind-turbine Rotor Blade Considering Rotational and Aerodynamic Load Effects
Kim, Dong-Man ; Kim, Dong-Hyun ; Park, Kang-Kyun ; Kim, Yu-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 651~658
DOI : 10.5050/KSNVN.2009.19.7.651
In this study, computer applied engineering(CAE) techniques are fully used to efficiently conduct structural and dynamic analyses of a huge composite rotor blade using super-element. Computational fluid dynamics(CFD) is used to predict aerodynamic loads of the rotating wind-turbine blade. Structural vibration analysis is conducted based on the non-linear finite element method for composite laminates and multi-body dynamic simulation tools. Various numerical results are presented for comparison and the structural dynamic behaviors of the rotor blade are investigated herein.
Dynamic Modeling of ER Damper Considering Fluid Compressibility
Seong, Min-Sang ; Ha, Sung-Hun ; Nguyen, Quoc-Hung ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 659~666
DOI : 10.5050/KSNVN.2009.19.7.659
This paper proposes a new method for dynamic modeling of electrorheological(ER) damper considering fluid compressibility. After describing configuration and operating principle of the ER damper, a quasi-static modeling of the ER damper is conducted on the basis of Bingham model of ER fluid. Subsequently, the dynamic model for describing the ER damper considering compressibility of ER fluid and gas chamber is obtained using the lumped parameter method. This method includes dynamic motions of annular duct, upper chamber, lower chamber and connecting pipe. The hysteresis behavior of the ER damper is evaluated through computer simulations and compared with experimental results. In addition, the hysteresis behavior due to the compressibility of ER fluid and gas chamber is investigated through computer simulations.
Development of Linear Magnetic Actuator for Active Vibration Control
Lee, Haeng-Woo ; Kwak, Moon-K. ; Kim, Ki-Young ; Lee, Han-Dong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 667~672
DOI : 10.5050/KSNVN.2009.19.7.667
This paper is concerned with the development of linear magnetic actuator for active vibration control. The newly developed linear magnetic actuator consists of permanent magnets and copper coils. On the contrary to the voice-coil type actuator, the linear magnetic actuator utilizes magnetic flux to generate the shaft movement. In this study, experiments on the prototype linear magnetic actuator were carried out to investigate its dynamic characteristics. Block and inertia forces generated by the actuator were measured. The experimental results show that the actuator can be used as both actuator and active tuned-mass damper. The linear magnetic actuator was attached to a cantilever as the active-tuned mass damper and active vibration control experiment was carried out. The experimental results show that the newly developed linear magnetic actuator can be effectively used for the active vibration control of structures.
2-Dimensional FEM Based Transient Analysis for an Efficient Design of Acoustic Windows
Kim, Y.C. ; Kim, S.K. ; Yoon, S.W. ; Lee, Y. ; Cho, M.S. ; Shin, Ku-Kyun ; Koo, J.C. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 673~678
DOI : 10.5050/KSNVN.2009.19.7.673
The efficiency of active sonar that is used underwater observation equipment is important for obtain the information of topography and trace for the objects. Sound wave transmitted from sonar are distorted by acoustic window which is to protect sonar. Making various sonar dome is impossible for experiment, because consumed unnecessary time and expense. So, the purpose of this study is to simulate and analyze the acoustic window propagated sound wave from sonar for designing model reduced insertion loss. Simulation is performed by transient analysis and fluid-structure interaction analysis. As a result, this study will give a opportunity for efficient design of sonar dome without high cost and time consumption.
Exhaust Noise Control of Marine Diesel Engine Using Hybrid Silencer
Lee, Tae-Kyoung ; Joo, Won-Ho ; Bae, Jong-Gug ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 679~684
DOI : 10.5050/KSNVN.2009.19.7.679
Low frequency exhaust noise of marine diesel engine is one of the most important noise sources in vessels. However, conventional absorptive silencers are ineffective to control exhaust noise because of low absorption in the low frequency range. In the paper, exhaust noise control of marine diesel engine was studied by using the hybrid silencer, which was composed of virtually divided array of concentric hole-cavity resonators and conventional absorptive silencer. A series of tests including field tests were performed to investigate the acoustic performance of the hybrid silencer. Consequently, its high performance of 5
10 dB noise reduction in the low frequency range was confirmed and it is expected to be very helpful in reducing the exhaust noise of marine diesel engine.
FE Analysis for Fundamental Air-cavity Resonant Frequency of Tire
Kim, Yong-Woo ; Bang, Sung-Huyn ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 685~692
DOI : 10.5050/KSNVN.2009.19.7.685
Vehicle interior noise is the results of numerous sources of excitation. One source involving tire pavement interaction is the tire cavity resonance and the forcing it provides to the vehicle spindle. Using a simplified model for the tire acoustic cavity system only, we formulated finite element equation to predict the fundamental acoustic cavity resonant characteristics inside tire-wheel assembly of undeformed and deformed tire. Combining the finite element analysis with experimental verification, we explained the acoustic characteristics theoretically. Especially, we have shown that the difference between the first two resonant frequencies increases as the deformation of deformed tire increases.
A Study on the Performance Improvement of Medium Speed Diesel Engine Exhaust Silencer in the Low-frequency Range Using Array Resonators
Kim, Young-Hyun ; Joo, Won-Ho ; Bae, Jong-Gug ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 693~698
DOI : 10.5050/KSNVN.2009.19.7.693
Various acoustic tests were carried out to investigate the acoustic performance of diesel engine exhaust silencers. In order to consider flow effects, the test facility was set up composed of fan, duct and silencer. Using the test facility, insertion loss tests were carried out to improve the acoustic performance in the low-frequency ranges. Through a series of tests, it was found out that the array resonators having multi-perforated holes inside the exhaust silencer, might be very effective in the low frequency range. Consequently, the hybrid-type silencer which is the combination of reflective silencer with array resonators and conventional absorptive silencer, was proposed and its high performance in the low-frequency range was also verified.
Nonlinear Stability Characteristics of Carbon Nanotubes
Choi, Jong-Woon ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 699~709
DOI : 10.5050/KSNVN.2009.19.7.699
In this paper, the nonlinear dynamics and the stability of nanopipes conveying fluid and modelled as a thin-walled beam is investigated. Effects of boundary conditions, geometric nonlinearity, 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 compared with linear case.
A Trajectory Identification Technique for Two Rotating Sound Sources with Different Frequencies
Lee, Jong-Hyun ; Lee, Ja-Hyung ; Rhee, Wook ; Choi, Jong-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 710~718
DOI : 10.5050/KSNVN.2009.19.7.710
The time difference of arrival(TDOA) algorithm is being used widely for identifying the location of a source emanating either electrical or acoustic signal. It`s application areas will not be limited to identifying the source at a fixed location, for example the origin of an earthquake, but will also include the trajectory monitoring for a moving source equipped with a GPS sensor. Most of the TDOA algorithm uses time correlation technique to find the time delay between received signals, and therefore difficult to be used for identifying the location of multiple sources. In this paper a TDOA algorithm based on cross-spectrum is developed to find the trajectory of two sound sources with different frequencies. Although its application is limited to for the sources on a disk plane, it can be applied for identifying the locations of more than two sources simultaneously.
Development of Efficient Numerical Method in Time-domain for Broadband Noise due to Turbulence-cascade Interaction
Kim, Sang-Ho ; Cheong, Cheol-Ung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 719~725
DOI : 10.5050/KSNVN.2009.19.7.719
An efficient time-domain numerical method for the analysis of broadband noise generation and propagation due to turbulence-cascade interaction is developed. The core algorithm of the present method is based on the B-periodicity of the acoustic response function of the flat-airfoil cascade to the ingesting gust(B denotes the number of airfoils in the cascade). To confirm this periodicity, gust-cascade interaction problem are solved by using the time-domain method, which shows that the incident gust with the circumferential mode number having the same remainders when divided by the airfoil number excites the same acoustic response of the cascade. Using the proposed fast algorithm with this periodicity, we show that the total computation time for the model broadband problem using the total 525 incident gust modes can be reduced to about 1/4 of that taken in using the previous time-domain program.
Fault Detection and Diagnosis for Induction Motors Using Variance, Cross-correlation and Wavelets
Tuan, Do Van ; Cho, Sang-Jin ; Chong, Ui-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 726~735
DOI : 10.5050/KSNVN.2009.19.7.726
In this paper, we propose an approach to signal model-based fault detection and diagnosis system for induction motors. The current fault detection techniques used in the industry are limit checking techniques, which are simple but cannot predict the types of faults and the initiation of the faults. The system consists of two consecutive processes: fault detection process and fault diagnosis process. In the fault detection process, the system extracts the significant features from sound signals using combination of variance, cross-correlation and wavelet. Consequently, the pattern classification technique is applied to the fault diagnosis process to recognize the system faults based on faulty symptoms. The sounds generated from different kinds of typical motor`s faults such as motor unbalance, bearing misalignment and bearing loose are examined. We propose two approaches for fault detection and diagnosis system that are waveletand-variance-based and wavelet-and-crosscorrelation-based approaches. The results of our experiment show more than 95 and 78 percent accuracy for fault classification, respectively.
Optimization of the Multi-chamber Perforated Muffler for the Air Processing Unit of the Fuel Cell Electric Vehicle
Kim, Eui-Youl ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 7, 2009, Pages 736~745
DOI : 10.5050/KSNVN.2009.19.7.736
Fuel cells convert a fuel together with oxygen in a highly efficient electrochemical reaction to electricity and water. Since the electrochemical reaction in the fuel cell stack dose not generate any noise, Fuel cell systems are expected to operated much quieter than combustion engines. However, the tonal noise and the broad band noise caused by a centrifugal compressor and an electric motor cause which is required to feed the ambient air to the cathode of the fuel cell stack with high pressure. In this study, the multi-camber perforated muffler is used to reduce noise. We propose optimized muffler model using an axiomatic design method that optimizes the parameters of perforated muffler while keeping the volume of muffler minimized.