Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korean Society for Noise and Vibration Engineering
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
Editor in Chief :
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
Selecting the target year
Pan-tilt Motion Generation of Robot Eye by Using a Pair of Push-pull Wires
Jung, Chan-Yul ; Oh, Kyung-Geune ; Park, Shin-Suk ; Kim, Seung-Jong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 3~8
DOI : 10.5050/KSNVE.2011.21.1.003
This paper introduces a robot eye module, of which two degree-of-freedom motions, i.e. panning and tilting, are driven by a pair of wires. The main feature of the module is that each wire can generate push-pull motion without buckling. It is thanks to a Teflon tube which guides the path of the moving wire. End points of the tube and wire have pivot elements so that a smooth push-pull motion is produced even when the end point of wire is moved by eye rotation. This mechanism helps the eye module to be very compact. In this paper, the structure of the robot eye module is introduced in detail, and the required motor angles for a certain direction of eye line are investigated analytically and experimentally.
Finite Element Vibration Analysis of Multi-layered Damped Sandwich Beam with Complex Shear Modulus
Bae, Seung-Hoon ; Won, Sung-Gyu ; Jeong, Weui-Bong ; Cho, Jin-Rae ; Bae, Soo-Ryong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 9~17
DOI : 10.5050/KSNVE.2011.21.1.009
In this paper, the general equation of motion of damped sandwich beam with multi-viscoelastic material layer was derived based on the equation presented by Mead and Markus. The viscoelastic layer, which has characteristics of complex shear modulus, was assumed to be dominantly under shear deformation. The equation of motion of n-layered damped sandwich beam in bending could be represented by (n+3)th order ordinary differential equation. Finite element model for the n-layered damped sandwich beam was formulated and programmed using higher order shape functions. Several numerical examples were implemented to show the effects of damped material.
A Study on the Pulsation Pressure Reduction for the Hydraulic System of Medium-large Excavator
Kim, Young-Hyun ; Joo, Won-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 18~23
DOI : 10.5050/KSNVE.2011.21.1.018
With hydraulic noise test facility, a variety of tests were performed to investigate the pulsation pressure generation mechanism and its transmission characteristics and to derive the noise control methodology. Many experiments were carried out by changing average pressure, flow rate, pump speed, hose length and MCV spool condition. From the test results, the correlations between pulsation pressure and other design parameters, such as static pressure, flow rate and MCV spool opening area and length of hose, were found out. And also each contribution factors were evaluated from the regression analysis. By changing hose length, the pulsation pressure resonance phenomenon was investigated. In order to find out the pulsation pressure reduction measures pulsation pressure analysis, such as pulsation pressure of hydraulic pump itself and pulsation pressure of hydraulic system, by using AMESim were studied. In addition hydraulic silencer was developed based on the Helmholtz resonator. And its performance was evaluated by installing the silencer at the excavator.
Performance Evaluation on an Active Hybrid Mount System for Naval Ships Using Piezostack Actuator
Quoc, Nguyen Vien ; Choi, Seung-Boh ; Oh, Jong-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 24~30
DOI : 10.5050/KSNVE.2011.21.1.024
In this work, a new active hybrid mount featuring piezostack actuator and rubber element is proposed, and its vibration control performance is evaluated by applying a robust frequency-shaped sliding mode controller. After describing the configuration of the proposed mount, vibration control performances are experimentally evaluated. A mount system with four active hybrid mounts is then constructed. To attenuate vibrations on the supported mass, a frequency-shaped sliding mode controller is designed and implemented to the system. Finally, control performances are obtained and presented in time and frequency domains via computer simulation.
Vibration Response of a Human Carpal Muscle
Chun, Han-Yong ; Kim, Jin-Oh ; Park, Kwang-Hun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 31~40
DOI : 10.5050/KSNVE.2011.21.1.031
This paper examines the dynamic characteristics of a human carpal muscle through theoretical analysis and experiment. The carpal muscle was modeled as a 1-DOF vibration system and vibration response due to a ramp function force was calculated. The electromyogram signal corresponding to the muscle excitation force was measured, and the excitation force function of an envelope curve from the electromyogram signal was extracted. The ramp input function of electrical stimulation to the carpal muscle was applied by using a device for functional electrical stimulation, and the angular displacements corresponding to steady state response were measured. Theoretical calculations of the vibration response displacements were compared with the experimental results of the angular displacements, and have shown a good agreement with the result that is linearly proportional to the excitation force magnitude. As a result, the relationship between the input current of the electrical stimulation and the excitation force magnitude was inferred. The result was shown that it can be applied to develop rehabilitation training devices.
Study on Noise Reduction of an Industrial Take-out Robot
Cho, Jae-Yun ; Kim, Deok-Su ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 41~46
DOI : 10.5050/KSNVE.2011.21.1.041
In this paper, we experimentally investigate factors that decrease in noise of a industrial take-out robot at driving state. For this, we analyse change in the noise of the take-out robot with gear machining accuracy and clearance. In order to calculate the noise related to gear machining accuracy that is based upon the Japanese Industrial Standard(JIS), we equally increase motor speed from 0 rpm to 1250 rpm. In addition, to investigate influence of clearance on noise, we evenly change clearance from 0.5 mm to 1.2 mm. These experiments show that clearance is more effective factor than gear machining accuracy to reduce the noise of the take-out robot.
A Review of Measuring Sensors for Reactor Vessel Internals Comprehensive Vibration Assessment Program in Advanced Power Reactor 1400
Ko, Do-Young ; Lee, Jae-Gon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 47~55
DOI : 10.5050/KSNVE.2011.21.1.047
Reactor vessel internals comprehensive vibration assessment program(RVI CVAP) is one of the necessary tests to ensure the safety of nuclear power plants. RVI CVAP of U.S. nuclear regulatory commission regulatory guide 1.20(U.S. NRC R.G. 1.20) consists of the analysis, measurement and inspection. One of the core technologies of the measurement program for RVI CVAP is to select suitable sensors because the measurement is conducted during the critical path of the construction period of nuclear power plants. Therefore, we analyzed RVI thermal-hydraulic and structure design data of Palo Verde nuclear power plant(U.S.), Yonggwang nuclear power plant(Korea) and APR1400 and researched measuring sensors used in them; moreover, we investigated sensors used for measurement of RVI CVAP for the last 20 years throughout the world. Based on these results, we selected suitable measuring sensors for RVI CVAP in advanced power reactor 1400(APR1400).
Development of a Hybrid Mount System Combined Airspring with Piezostack Actuator for Microvibration
Moon, S.J. ; Jung, H.J. ; Shin, Y.H. ; Jang, D.D. ; Jeong, J.A. ; Moon, Y.J. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 56~65
DOI : 10.5050/KSNVE.2011.21.1.056
A new hybrid mount system is proposed for microvibration control in a high-tech factory. The mount consists of an airspring as a passive device and a piezostack actuator as an active device. The two devices are connected in series. Some numerical simulations and experimental tests are carried out to evaluate isolation performance of the mount system comprising of four proposed hybrid mounts. As a control logic, the specific algorithm is adopted for considering multiple target frequencies of excitation based on a Filtered-X LMS algorithm. The results are compared with isolation performance of the passive airspring mount system. It is confirmed that the proposed hybrid mount system has great performance on microvibration.
Free Vibrations of Tapered Beams with Constant Surface Area
Lee, Byoung-Koo ; Oh, Sang-Jin ; Park, Chang-Eun ; Lee, Tae-Eun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 66~73
DOI : 10.5050/KSNVE.2011.21.1.066
This paper deals with free vibrations of the tapered beams with the constant surface area. The surface area of the objective beams are always held constant regardless shape functions of the cross-sectional depth. The shape functions are chosen as the linear and parabolic ones. Ordinary differential equations governing free vibrations of such beams are derived and solved numerically for determining the natural frequencies. In the numerical examples, hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered. As the numerical results, the relationships between non-dimensional frequency parameters and various beam parameters such as section ratio, surface area ratio, end constraint and taper type are reported in tables and figures. Especially, section ratios of the strongest beam are calculated, under which the maximum frequencies are achieved.
Dynamic Modeling and Controller Design for Active Control of High-speed Elevator Front-back Vibrations
Baek, Kwang-Hyun ; Kim, Ki-Young ; Kwak, Moon-K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 74~80
DOI : 10.5050/KSNVE.2011.21.1.074
Front-back vibrations of high-speed elevator need to be suppressed as in the case of lateral vibrations. The dynamic model for the front-back vibrations is different from the lateral vibration model since the supporting structure varies. In this study, a dynamic model was derived using the energy method. Based on the free vibration analysis, it was observed that the fundamental frequency for the front-back vibration is slightly lower than the fundamental frequency of the lateral vibration, which means that the active vibration control should be carried out in both directions. The PPF control algorithm was applied to the numerical model under measured rail irregularities. The numerical results show that the active vibration control of elevator front-back vibration is also possible.
Noise Reduction of PDP TV Using Multi-dimensional Spectral Analysis Method
Yang, In-Hyung ; Jeong, Jae-Eun ; Kwak, Hyung-Taek ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 1, 2011, Pages 81~88
DOI : 10.5050/KSNVE.2011.21.1.081
The method is introduced for estimating the noise source contribution on the noise of PDP TV in a multiple-input system where the input sources may be coherent with each other. By the coherence function method, it is found that the biggest part of the noise source in the PDP TV noise is generated by the PCB boards which consume high power and produce high heat. This analysis is modeled as three-input/single-output system because the noise is generated by three main boards, X-board, Y-board, SMPS that are located close to each other. The coherence function method is proved to be useful tool for identifying of noise source. In this study, Transfer Path Analysis using MDSA is implemented to determine the quantitative noise contribution of each board for PDP TV with the rear case closed and with the rear case open. And the possibility of noise reduction is confirmed through the experimental method that isolates the most contributing board by adding sound-absorbing materials to it.