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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
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Modeling of Flux Leakage in a Magnetic Circuit with Permanent Magnet
Kim, Seung-Jong ; Kim, Woo-Yeon ; Lee, Jong-Min ; Bae, Yong-Chae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 99~105
DOI : 10.5050/KSNVE.2011.21.2.099
The magnetic circuit analysis excluding flux loss and fringing effect often gives a result with unignorable error, when compared with real system. But, it is not easy to make a complete magnetic circuit model with the loss effects. This paper introduces a relatively simple method to build the model including the flux loss and fringing effect, in which the paths of leaked flux are simplified in terms of circular arcs and straight lines. After modification of the model, the error of about 36 % in maximum between the magnetic circuit analysis and FEM analysis is reduced to about 7 %.
MEMS Accelerometer Modeling and Performance Analysis by Considering Signal Distortion
Kim, Yong-Il ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 106~111
DOI : 10.5050/KSNVE.2011.21.2.106
In this paper, assumed mode method on Euler beam theory is employed and signal distortion is considered to obtain the performances of a MEMS accelerometer which are a sensitivity and measurable frequency range(MFR). Not only the sensitivities and MFR but also the variations of dynamic responses and natural frequencies of the MEMS accelerometer are investigated for several sets of beam properties such as length, width, thickness and Young's modulus. It is stated that the variations of beam properties significantly influence the performances of the MEMS accelerometer and the relationship between sensitivities and MFR is inversely proportional to each other.
Measurement of Static and Dynamic Displacement by Image Processing and Study for Prediction Method of Velocity and Acceleration
Heo, Seok ; Lee, Bum-Ho ; Jang, Il-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 112~119
DOI : 10.5050/KSNVE.2011.21.2.112
This paper is concerned with the measurement of static and dynamic displacement by image processing(IP) and study for prediction method of velocity and acceleration. To measure the displacement visually, the measurement system consists of a telephoto zoom camera, CCD(charge coupled device) image device and a computer. The specific target on the white board is used to calculate the displacement of the structure. The captured image is then converted into a pixel-based data and then analyzed numerically. The limitation of the system depends on the image capturing speed and the pixel-size of image. In this paper, we developed for the displacement measurement using the image processing method. The proposed method enables us to measure the vibration displacement, velocity and acceleration directly without any contact. The current resolution for the displacement measurement can be seen from the results.
Structure-borne Noise Analysis of Marine Diesel Engine Considering Receptance of Hull Structure at Mounting Point
Jang, Seong-Gil ; Jeong, Weui-Bong ; Hong, Chin-Suk ; Bae, Soo-Ryong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 120~128
DOI : 10.5050/KSNVE.2011.21.2.120
This paper presents an efficient method to analyze noise and vibration of marine diesel engines mounted on flexible hull structure. The analysis model should in general include the hull structure, leading to lots of computational efforts. To minimize the computational efforts, in this paper, the transfer synthesis utilizing the receptance at the mounting points is proposed. The procedure is then verified by comparing the results with those from the full model calculation. The effects of flexible hull structure on the acoustic power from engine block are finally investigated. It is found that the effect of the hull is significant when the receptance of hull structure is similar to or greater than that of mount or engine block.
Source Localization of Single Impact Based on Higher Order Time Frequency
Moon, Yoo-Sung ; Lee, Sang-Kwon ; Yang, Hong-Goon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 129~136
DOI : 10.5050/KSNVE.2011.21.2.129
The aim of this paper is to present the method of identifying the impact location on the plate. This basic research has the future purpose to achieve the human-interaction technology based on the signal processing, piezoelectric materials, and wave propagation. The present work concerning the location identification of a single impact on the plate simulated the waveform numerically generated by impact force and applied the SWFOM(sliced Wigner higher fourth order moment) to the waveform to get the arrival time differences due to impact force between three sensors attached to the plate. The simulated signal is useful to get the information for time interval for the only direct wave. This information is used the source localization by using experimental work. The measured signal is also used for source localization of a single impact based on the higher order time frequency as a novel work.
Dynamic Response of Coupled Maglev Train and Guideway System
Kong, Eun-Ho ; Kang, Bu-Byoung ; Na, Sung-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 137~145
DOI : 10.5050/KSNVE.2011.21.2.137
This study is proposed to develop a numerical interaction model of the magnetically levitated(maglev) train and guideway. For this purpose, equation of motion for 6-DOF vehicle model, EMS, guideway and guideway irregularity are derived as the state-space equation. In order to solve the state space equations, the present work was performed via matlab simulation using Runge-Kutta method. Through the simulation, the effect of dynamic response of maglev system to different vehicle speeds, guideway rigidity(EI) and masses is investigated.
New Machine Condition Diagnosis Method Not Requiring Fault Data Using Continuous Hidden Markov Model
Lee, Jong-Min ; Hwang, Yo-Ha ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 146~153
DOI : 10.5050/KSNVE.2011.21.2.146
Model based machine condition diagnosis methods are generally using a normal and many failure models which need sufficient data to train the models. However, data, especially for failure modes of interest, is very hard to get in real applications. So their industrial applications are either severely limited or impossible when the failure models cannot be trained. In this paper, continuous hidden Markov model(CHMM) with only a normal model has been suggested as a very promising machine condition diagnosis method which can be easily used for industrial applications. Generally hidden Markov model also uses many pattern models to recognize specific patterns and the recognition results of CHMM show the likelihood trend of models. By observing this likelihood trend of a normal model, it is possible to detect failures. This method has been successively applied to arc weld defect diagnosis. The result shows CHMM's big potential as a machine condition monitoring method.
Dynamic Modeling and Active Controller Design for Elevator Lateral Vibrations
Kwak, Moon-K. ; Kim, Ki-Young ; Baek, Kwang-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 154~161
DOI : 10.5050/KSNVE.2011.21.2.154
This paper is concerned with the modeling and active controller design for elevator lateral vibrations. To this end, a dynamic model for the lateral vibration of the elevator consisting of a supporting frame, cage and active roller guides was derived using the energy method. Free vibration analysis was then carried out based on the equations of motion. Active vibration controller was designed based on the PID control algorithm and applied to the numerical model. Rail irregularity were considered as external disturbance in the numerical simulations. The numerical results show that the active vibration control of elevator is possible.
Comparisons of Isolation Performances for the SMA Mesh Washer Isolator with the Variation of Pre-compressed Displacement
Youn, Se-Hyun ; Jeong, Ho-Kyeong ; Han, Jae-Hung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 162~168
DOI : 10.5050/KSNVE.2011.21.2.162
Launch vehicles and satellites experience severe vibration and pyroshock during the flight phase. These severe dynamic loading could result in the malfunction of electric devices which equipped in the launch vehicle and satellite. In this paper, mesh washer isolators are applied to attenuate these severe shock and vibration and isolation performances are enhanced by applying pseudoelasitic SMA wire material. Through random vibration and ground pyroshock tests, outstanding isolation performances are studied. Especially, comparison of isolation performances due to the change of pre-compressive displacement of mesh washer itself are suggested and applicablity to the adaptive vibration control are confirmed.
Experimental Study on Detection of Crack for Coupled Bending-torsional Vibrations of L-beams
Son, In-Soo ; Lee, Doo-Ho ; No, Tae-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 169~177
DOI : 10.5050/KSNVE.2011.21.2.169
In this paper, the natural frequency of a cracked cantilever L-beams with a coupled bending and torsional vibrations is investigate by theory and experiment. In addition, a method for detection of crack in a cantilever L-beams is presented based on natural frequency measurements. The governing differential equations of a cracked L-beam are derived via Hamilton's principle. The two coupled governing differential equations are reduced to one sixth order ordinary differential equation in terms of the flexural displacement. Futher, the dynamic transfer matrix method is used for calculation of a exact natural frequencies of L-beams. The crack is assumed to be in the first mode of fracture and to be always opened during vibrations. In this study, the differences between the actual and predicted positions and sizes of crack are less than about 10 % and 39.5 % respectively.
Improvement of Dynamic Characteristics of an Optical Image Stabilizer in a Compact Camera
Song, Myeong-Gyu ; Son, Dong-Hun ; Park, No-Cheol ; Park, Kyoung-Su ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 178~185
DOI : 10.5050/KSNVE.2011.21.2.178
Optical image stabilization is a device to compensate the camera movement in the exposure time. The compensation is implemented by movable lens or image sensor that adjusts the optical path to the camera movement. Generally, the camera is moved by a handshake, thus the handshake is considered as an external disturbance. However, there are many other vibrations such as car and train vibration. In this paper, the optical image stabilization system in high frequency region is presented. Notch filter and lead compensator are designed and applied to improve the stability without changing the actuator. To verify the performance of the optical image stabilization system in high frequency region, the experiment equipment with moving object is established. It is confirmed that the opticalimage stabilization system does not diverge at the resonance frequency.
Development of NDIF Method for Highly Accurate Free Vibration Analysis of Arbitrarily Shaped Plates with Simply Supported Boundary Condition
Kang, Sang-Wook ; Woo, Yoon-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 2, 2011, Pages 186~193
DOI : 10.5050/KSNVE.2011.21.2.186
The NDIF method(non-dimensional dynamic influence function method) for free vibration analysis of arbitrarily shaped plates with the simply supported edge is newly developed in the paper. In order to extract the system matrix that gives the natural frequencies and natural modes of the plate of interest, the difficulty of measuring higher differential terms involved in the simply supported boundary condition is successfully overcome. Finally, the excellence of the characteristics of convergence and accuracy of the proposed method is shown through two verification examples, which indicate that natural frequencies and natural modes obtained by the proposed method are very accurate and swiftly converged even though a small number of nodes are used compared with FEM.