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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 25, Issue 12 - Dec 2015
Volume 25, Issue 11 - Nov 2015
Volume 25, Issue 10 - Oct 2015
Volume 25, Issue 9 - Sep 2015
Volume 25, Issue 8 - Aug 2015
Volume 25, Issue 7 - Jul 2015
Volume 25, Issue 6 - Jun 2015
Volume 25, Issue 5 - May 2015
Volume 25, Issue 4 - Apr 2015
Volume 25, Issue 3 - Mar 2015
Volume 25, Issue 2 - Feb 2015
Volume 25, Issue 1 - Jan 2015
Selecting the target year
An Experimental Study on the Noise Source Identification of Rotary Compressor
Son, Young-boo ; Ha, Jong-hun ; Lee, Jang-woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 723~730
DOI : 10.5050/KSNVE.2015.25.11.723
This paper investigated the noise generation mechanism of a rotary compressor using experimental method. The measurement was carried out for primary parameters which influence noise characteristics. By using STFT(short time Fourier transform), noise sources of a rotary compressor were identified and vibrating modes that increase the noise are verified. Also, it was studied that the correlation between operating speed and noise. Main factors that affect the variation of noise level were considered by the comparison of the experimental results. In addition, a dynamic characteristic of crank shaft was studied and the critical speed was analyzed.
Multi-crack Detection of Beam Using the Change of Dynamic Characteristics
Kim, Jung Ho ; Lee, Jung Woo ; Lee, Jung Youn ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 731~738
DOI : 10.5050/KSNVE.2015.25.11.731
This study proposed the method of the multi-crack detection using the sensitivity coefficient matrix which is calculated from the change of eigenvalues and eigenvectors before and after the crack. Each crack is modeled by a rotational springs. The method is applied to the cantilever beam with miulti-crack. The eigenvalues and eigenvectors are determined for different crack locations and depths. The prediction of multi-crack detection are in good agreement with the results of structural reanalysis.
Damage Count Method Using Acceleration Response for Vibration Test Over Multi-spectral Loading Pattern
Kim, Chan-Jung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 739~746
DOI : 10.5050/KSNVE.2015.25.11.739
Several damage counting methods can be applied for the fatigue issues of a ground vehicle system using strain data and acceleration data is partially used for a high cyclic loading case. For a vibration test, acceleration data is, however, more useful than strain one owing to the good nature of signal-to-random ratio at acceleration response. The test severity can be judged by the fatigue damage and the pseudo-damage from the acceleration response stated in ISO-16750-3 is one of sound solutions for the vibration test. The comparison of fatigue damages, derived from both acceleration and strain, are analyzed in this study to determine the best choice of fatigue damage over multi-spectral input pattern. Uniaxial excitation test was conducted for a notched simple specimen and response data, both acceleration and strain, are used for the comparison of fatigue damages.
Measurement of Acoustic Radiation Efficiency of the Submerged Circular Cylindrical Structure in Water Tank
Han, Seungjin ; Kang, Myunghwan ; Lee, Jongju ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 747~752
DOI : 10.5050/KSNVE.2015.25.11.747
Underwater radiated noise is an important characteristic in the naval weapon systems. It is difficult to measure the radiation efficiency of underwater vehicle, such as UUV(unmanned underwater vehicle) and underwater weapons in real operation environment. In this study, acoustic radiation efficiency of a circular cylindrical structure is measured in the laboratory-water tank. The radiation efficiency is compared with the numerical results and it is found that they are in a good agreement. Therefore, the measurement method can be applied effectively for predicting the underwater radiation noise and effectiveness of radiation reduction means.
Decentralized Robust Adaptive Neural Network Control for Electrically Driven Robot Manipulators with Bounded Input Voltages
Shin, Jin-Ho ; Kim, Won-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 753~763
DOI : 10.5050/KSNVE.2015.25.11.753
This paper proposes a decentralized robust adaptive neural network control scheme using multiple radial basis function neural networks for electrically driven robot manipulators with bounded input voltages in the presence of uncertainties. The proposed controller considers both robot link dynamics and actuator dynamics. Practically, the controller gain coefficients applied at each joint may be nonlinear time-varying and the input voltage at each joint is saturated. The proposed robot controller overcomes the various uncertainties and the input voltage saturation problem. The proposed controller does not require any robot and actuator parameters. The adaptation laws of the proposed controller are derived by using the Lyapunov stability analysis and the stability of the closed-loop control system is guaranteed. The validity and robustness of the proposed control scheme are verified through simulation results.
Fault Detection Method of Pipe-type Cantilever Beam with a Tip Mass
Lee, Jong Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 764~770
DOI : 10.5050/KSNVE.2015.25.11.764
A crack identification method using an equivalent bending stiffness and natural frequency for cracked beam is presented. Modal properties of cantilever beam with a tip mass is identified by applying the boundary conditions to a general solution. An equivalent bending stiffness for cracked beam based on an energy method is used to identify natural frequencies of cantilever thin-walled pipe with a tip mass, which has a through-the-thickness crack, subjected to bending. The identified natural frequencies of the cracked beam are used in constructing training patterns of neural networks. Then crack location and size are identified using a committee of the neural networks. Crack detection was carried out for an example beam using the proposed method, and the identified crack locations and sizes agree reasonably well with the exact values.
Vibration Characteristics of High Speed Rotary Bell Cup
Sohn, Jung Woo ; Park, Ji Hoon ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 771~778
DOI : 10.5050/KSNVE.2015.25.11.771
In this work, vibration characteristics of high speed rotary bell cup for paint atomizer are numerically investigated. New type of bell cup model is proposed and additional corresponding models with design parameter variations for length and diameter are constructed. Dynamic characteristics, such as natural frequencies and corresponding mode shapes, are studied for each model as a first step. To investigate operation stability, critical speed of rotary bell cup is numerically analyzed based on Campbell diagram and separation margin between operating speed and critical speed is identified. Unbalance vibration responses are also investigated with respect to design parameter variation, operating speed and balancing quality grade of G. Then the proper design guideline for stable operation of high speed rotary bell cup for paint atomizer is suggested.
Extraction of Accurate Eigenvalues of Plates Using a Meshless Method
Kang, Sangwook ; Woo, Yoonhwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 779~786
DOI : 10.5050/KSNVE.2015.25.11.779
The Kansa method, which is used for various free vibration problems of arbitrarily shaped plates including membranes, discretizes the domain of a plate using only nodes without elements unlike FEM. The method requires a small amount of computation relative to FEM thanks to this discretization scheme but has limit in the accuracy of its solution. This paper reveals the reason of the limit and, to overcome the limit, proposes the practical method of calculating the singularity of a system matrix and extracting accurate natural frequencies. Case studies for a rectangular plate and an arbitrarily shaped plate validate the proposed method.
An Experimental Study of the Cochlea-inspired Artificial Filter Bank(CAFB) for Compressed Sensing
Heo, Gwanghee ; Jeon, Joonryong ; Jeon, Seunggon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 25, issue 11, 2015, Pages 787~797
DOI : 10.5050/KSNVE.2015.25.11.787
In this paper, a cochlea-inspired artificial filter bank(CAFB) was developed in order to efficiently acquire dynamic response of structure, and it was also evaluated via dynamic response experiments. To sort out signals containing significant modal information from all the dynamic responses of structure, it was made to adopt a band-pass filter optimizing algorithm(BOA) and a peak-picking algorithm (PPA). Optimally designed on the basis of El-centro and Kobe earthquake signals, it was then embedded into the wireless multi-measurement system(WiMMS). In order to evaluate the performance of the developed CAFB, a vibration test was conducted using the El-centro and Kobe earthquake signals, and structural responses of a two-span bridge were obtained and analyzed simultaneously by both a wired measurement system and a CAFB-based WiMMS. The test results showed that the compressed dynamic responses acquired by the CAFB-based WiMMS matched with those of the wired system, and they included significant modal information of the two-span bridge. Therefore this study showed that the developed CAFB could be used as a new, economic, and efficient measurement device for wireless sensor networks(WSNs) based real time structural health monitoring because it could reconstruct the whole dynamic response using the compressed dynamic response with significant modal information.