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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
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Investigation on Natural Modes of Substructure of Wave Energy Converter with Overtopping Flow Device
Kim, Byoung-Wan ; Shin, Seung-Ho ; Hong, Key-Yong ; Choi, You-Su ; Seo, Jeong-Oh ; Ahn, Ike-Jang ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 323~330
DOI : 10.5050/KSNVE.2010.20.4.323
An efficient wave energy converter with new overtopping flow device on which spiral reefs are attached is proposed by Maritime and Ocean Engineering Research Institute in Korea and its candidate substructures such as monopile, tripod and jacket are designed. This study investigates modal characteristics of the substructures by analyzing natural frequencies and mode shapes. Based on the modal analysis results, relative strength, governing modes and some complementary design strategies of each candidate substructure are compared and discussed considering water depth conditions.
Vibration Serviceability Evaluation of Prestressed Concrete Girder Bridge
Kang, Sung-Hoo ; Kim, Bo-Hwoan ; Park, Sun-Joon ; Kim, Seung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 331~337
DOI : 10.5050/KSNVE.2010.20.4.331
The thesis shows that we gauged vibration of vehicular load regarding WPC girder bridge and researched into dynamic characteristics(natural frequency, vibration acceleration) of WPC girder bridge. By the basic of that, we researched on vibration serviceability by looking over and being compared to vibration criteria we had before. In the thesis, the gauged vibration made an analysis of vertical acceleration through FFT method and evaluated vibration serviceability about vibration sense the body feels by means of the standard of ISO assessment standard and Meister assessment standard by referring to analysis data. This research on bridge is WPC girder bridge of 90 m span, width of 5.5 m, and the experiment was gauged by a fluent which is right way and inverse way about dump truck of gross 270 kN. Acceleration was located in the middle of 1st span, 2nd span, 3rd span. As a result of appraisal standard of Meister, the vibrations of the bridge have distributed between "level C, strongly perceptible" and "level B, disturbing". Also the vibration can be attacked with unpleasant feeling. As a result of appraisal standard of ISO, from vibration influence didn't come to 60s, and reduced comfort boundary in part of most rigorous standard that such a case didn't happen.
Investigation on Vibration Characteristics and Structural Reciprocity of Heunginjimun
Choi, Jae-Sung ; Lee, Sung-Kyung ; Min, Kyung-Won ; Yoon, Weon-Kyu ; Kim, Derk-Moon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 338~347
DOI : 10.5050/KSNVE.2010.20.4.338
Heunginjimun designated as a Treasure No.1 is a two-story wooden structure with 5 bay and 2 bay in its front and side views, respectively. This paper presents an investigation on vibration characteristics of Heunginjimun through both ambient vibration and impact hammer tests. Ambient vibration test was performed to identify the natural frequency of Heunginjimun from the spectrum analysis of time history. Impact hammer test was undertaken to find the frequency of Heunginjimun which is affected by the surrounding traffics and to verify the reciprocal principle for the wooden structural system. Ambient vibration test results of Heunginjimun showed that the natural frequencies in two principal axes 1.5 Hz and 1.1 Hz, respectively. It was confirmed from impact hammer tests for a ground that the frequency of 4.2 Hz is caused by the traffics surrounding Heunginjimun. It was also observed that from the impact hammer test results between two locations in Heunginjimun that the transfer functions measured from two corresponding locations coincided well with each other. This result shows that the wooden structural system is globally linear, and the reciprocal principle is established.
The Development of Software for Vehicle Engine Mounting System Analysis
Park, Un-Hwan ; Song, Yoon-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 348~354
DOI : 10.5050/KSNVE.2010.20.4.354
In the beginning of vehicle development, it is difficult to define the concept of engine mounting system. With only the property of vehicle, we have to find the direction of engine mounting system. And it is important to find common mounts for several engine variation in order to reduce the cost and manage mounts efficiently. This paper introduces the software which has developed for engine mounting system analysis. And its function and usefulness are explained in paper. The examples have correlated between the analysis model and real model to raise the accuracy during development of engine mounting system are shown in paper.
Equivalent Modeling of an Alignment Stage Based on the Vibration Tests
Yim, Hong-Jae ; Lee, Jung-Suk ; Lee, Sung-Hoon ; Jeong, Jay-I. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 355~360
DOI : 10.5050/KSNVE.2010.20.4.355
In this study, a modeling process of a 3-axis planar alignment stage is suggested. Vibration tests using a laser vibro-meter is performed to find the modeling parameters of the stage. By analyzing the result of the test, the stiffness of prismatic joints and revolute joints, as well as the contact conditions of the thrust bearings, can be calculated. The modeling of the stage was validated by comparing six normal mode shapes, which are acquired from experiments and simulations.
Design of Ball Bearing Type OIS Actuator for Mobile Camera Module
Song, Myeong-Gyu ; Son, Dong-Hun ; Park, No-Cheol ; Park, Kyoung-Su ; Park, Young-Pil ; Lim, Soo-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 361~372
DOI : 10.5050/KSNVE.2010.20.4.361
Optical image stabilization is a technique to compensate the image blurring caused by some vibrations of camera at the exposure time. Pitching and yawing of camera are sensitive to the image quality so they are usually compensated by optical image stabilization. Corresponding pitching and yawing of a camera, a lens or the image sensor is translated in two-axis direction and then the optical path of camera is adjusted. In this paper, two-axis OIS actuator for mobile camera module is suggested and designed. The actuator is a voice-coil actuator that uses the electromagnetic force of voice-coil to make compensation motions. And ball bearing is used to reduce friction force. Magnetic attractive force between magnets and yokes acts as a preload and magnet springs. Prototype actuator is fabricated to measure the friction force and to verify the feasibility of the OIS actuator with ball bearing. At last, the actuator is improved in consideration of driving force and friction force. Design of experiments is used for designing the actuator.
A Study on Curve Running Characteristic of DMT Freight
Lee, Seung-Il ; Eom, Beom-Gyu ; Lee, Hi-Sung ; Lee, Young-Yeob ; Kim, Yong-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 373~380
DOI : 10.5050/KSNVE.2010.20.4.373
An interest is increased of environment and energy so, importance on railroad high energy efficiency is magnified. And after Gyeong-bu High speed rail is completed, share rate freight transportation of railroad is expected to be gradually increased due to expand investment for railroad and operate mainly freight transportation on convention line. Therefore a research on DMT freight cars is necessary under like this situation. In paper, we developed analysis model for DMT freight car and DMT freight was analyzed numerically using VI-Rail in each condition of railway having different curve and carried out vibration analysis on curving using developed analysis model. And we carried out test on driving stability follow changing curve radius then measure against UIC code 518.
Shock Traveling Analysis of Truck-Mounted Special Equipments
Song, Oh-Seop ; Lee, Hak-Yeol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 381~389
DOI : 10.5050/KSNVE.2010.20.4.381
Modern military equipments are often required to be mounted on a truck for their survivability and operation performance. Special units installed on the truck at times experience serious shock vibration caused by obstacles of road and/or uncommon road shape. It is then essential to analyze the travel performance of truck-mounted special units for their survivability and performance. In this paper, shock responses of the equipments subjected to bump passing and wash board road are experimentally obtained and also analyzed via FEM. Modified bump configuration and road profile considering the interface with tire are suggested. Analytical results considering this modification show good agreement with test results.
The Study of Modified van der Waals Interactions on Free Vibration of Multi-walled Carbon Nanotubes Using Multi-elastic Beam Model
Yoon, Ju-Il ; Kang, S.W. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 390~396
DOI : 10.5050/KSNVE.2010.20.4.390
Resonant frequencies and the associated vibrational modes of multiwall carbon nanotubes are studied in this paper. The analysis is based on a multiple-elastic beam model, considering intertube radial displacements and the related internal degrees of freedom. Especially, van der Waals interaction is modified considering both all interaction between each layers in multi-wall carbon nanotubes and curvature effect. The results show that modified van der Waals interaction could significantly affect the natural frequencies of multi-walled carbon nanotubes. In particular, non-coaxial intertube resonance will be excited at the higher resonant frequencies of multiwall carbon nanotubes.
Analysis of Vibration-powered Piezoelectric Energy Harvesters by Using Equivalent Circuit Models
Kim, Jae-Eun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 397~404
DOI : 10.5050/KSNVE.2010.20.4.397
The use of equivalent circuit models of piezoelectric energy harvesters is inevitable when power circuitry including rectifying and smoothing circuit elements is connected to them for evaluating DC electrical outputs. This is because it is difficult to incorporate the electro-mechanical coupling resulting from the additional circuitry into the conventional finite element analysis. Motivated by this observation, we propose a method to accurately extract the equivalent circuit parameters by using commercially available FEM software such as ANSYS which provides three-dimensional AC piezoelectric analysis. Then the equivalent circuit can be analyzed by circuit simulators such as
of MATLAB. While the previous works have estimated the circuit parameters by experimental measurements or by analytical solutions developed only for limited geometries and boundary conditions, the proposed method has no such limitation because piezoelectric energy harvesters of any shapes and boundary conditions can be treated in FEM software. For the verification of the proposed method, multi-modal AC electrical power output by using a corresponding equivalent circuit is compared with that by ANSYS. The proposed method is then shown to be very useful in the subsequent evaluation of DC electrical output which is obtained by attaching a bridge diode and a storage capacitor to a piezoelectric energy harvester.
Vibration Characteristics of Embedded Piles Carrying a Tip Mass
Choi, Dong-Chan ; Byun, Yo-Seph ; Oh, Sang-Jin ; Chun, Byung-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 405~413
DOI : 10.5050/KSNVE.2010.20.4.405
The vibration characteristics of fully and partially embedded piles with flexibly supported end carrying an eccentric tip mass are investigated. The pile model is based on the Bernoulli-Euler theory and the soil is idealized as a Winkler model for mathematical simplicity. The governing differential equations for the free vibrations of such members are solved numerically using the corresponding boundary conditions. The lowest three natural frequencies and corresponding mode shapes are calculated over a wide range of non-dimensional system parameters: the rotational spring parameter, the relative stiffness, the embedded ratio, the mass ratio, the dimensionless mass moment of inertia, and the tip mass eccentricity.
Vibration Analysis of the Tapping AFM Microcantilevers Using Proper Orthogonal Decomposition
Hong, Sang-Hyuk ; Lee, Soo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 4, 2010, Pages 414~421
DOI : 10.5050/KSNVE.2010.20.4.414
The proper orthogonal decomposition(POD) is used to the vibration analysis of microcantilever in tapping mode atomic force microscopy(AFM). The proper orthogonal modes (POM) are extracted from vibrating signals of microcantilever when it resonates and taps the sample. We present recent ideas based on POD and detailed experiments that yield new perspectives into the microscale structures such as the tapping cantilever. The linearized modeling technique based on POD is very useful to show the principal characteristics of the complex dynamic responses of the AFM microcantilever.