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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 23, Issue 12 - Dec 2013
Volume 23, Issue 11 - Nov 2013
Volume 23, Issue 10 - Oct 2013
Volume 23, Issue 9 - Sep 2013
Volume 23, Issue 8 - Aug 2013
Volume 23, Issue 7 - Jul 2013
Volume 23, Issue 6 - Jun 2013
Volume 23, Issue 5 - May 2013
Volume 23, Issue 4 - Apr 2013
Volume 23, Issue 3 - Mar 2013
Volume 23, Issue 2 - Feb 2013
Volume 23, Issue 1 - Jan 2013
Selecting the target year
The Survey for the Maximum Noise Level of Portable Audio Equipments and Its Assessment
Lee, Jaewon ; Gu, J.H. ; Park, H.G. ; Lee, W.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 3~8
DOI : 10.5050/KSNVE.2013.23.1.003
Recently, the impact on hearing induced by using of portable audio equipment have been actively studied. In general, Because they turn the volume up with loud background noise, they may expose to louder noise. In this study, we investigated the maximum noise level of 20 the domestic potable audio equipment and estimated the impact of the hearing induced by portable audio equipment in according to exposure time. As a result, the use of portable audio equipment is assumed to be more three hours when the level of more than 50 % of volume is most likely to affect the hearing.
Electromyo-potential Response to Electric Stimulus Excitation at a Human Antebrachial Joint
Hong, Jong Han ; Kim, Jin Oh ; Lee, Dong Chan ; Park, Kwang Hun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 9~16
DOI : 10.5050/KSNVE.2013.23.1.009
This paper experimentally deals with the excitation by functional electrical stimulus(FES) and the response of electromyo-potential at the muscles of antebrachial joint in a human body. The excitation of FES, which results in the contraction of the muscles and thus the flection of the joint, shows that the flection angle of the joint is proportional to the magnitude of the stimulus current. The response of electromyo-potential measured according to the FES shows the linearly-proportional relation between the joint torque and the electromyo-potential. The results can be used for active motion of joint rehabilitation.
Comparison of Acceleration of Vibration Isolator and Accelerometer Attached Vibration Isolator Using Numerical Analysis
Shin, Dong Ho ; Lee, Jung Woo ; Oh, Jae-Eung ; Lee, Jung Youn ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 17~24
DOI : 10.5050/KSNVE.2013.23.1.017
The process of producing high precision and light weight product is always exposed to impact load or shock. Because of this, isolator device is required. To measure the response of the isolator, accelerometer is practically used. However, the measured response of the accelerometer is different to the response of the isolator. To predict the response of the accelerometer and the isolator, 2-DOF damped system with an input shock is modeled using numerical analysis. 1-DOF damped system with a base excitation is also used to predict the response of the isolator. The mass ratio, damping ratio, and natural frequency ratio are then varied. The predicted responses from the two modeling approaches are compared and large errors are found.
Experiment on Sloshing of Annular Cylindrical Tank for Development of Attitude Control Devices of Floating Offshore Wind Turbines
Seo, Myeongwoo ; Jeong, Weuibong ; Cho, Jinrae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 25~33
DOI : 10.5050/KSNVE.2013.23.1.025
The floating offshore wind turbines are usually exposed to the wave and wind excitations which are irregular and undirected. In this paper, the sloshing characteristics of annular cylindrical tank were experimentally investigated to reduce the structural dynamic motion of floating offshore wind turbine which is robust to the irregular change of excitation direction of wind and wave. The formula for the natural sloshing frequencies of this annular cylindrical tank was derived theoretically. In order to validate this formula, the shaking equipment was established and frequency response functions were measured. Two types of tank were considered. The first and second natural sloshing frequencies were investigated according to the depth of the water. It has been observed that between theoretical and experimental results shows a good agreement.
Experiment Evaluation for the Heavy-weight Impact Sound of Dry Double-floor System - Effect of Rubber Hardness and Ceiling Structure -
Yeon, Junoh ; Kim, Kyoungwoo ; Choi, Hyunjuong ; Yang, Kwanseop ; Kim, Kyungho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 34~40
DOI : 10.5050/KSNVE.2013.23.1.034
The 1st assessment(performance test) was applied to assure the floor impact sound performance for developing the dry double-floor with the change of rubber hardness of the upper panel's support and the ceiling structure of the sub-floor. Depends on the change of the rubber hardness in sub-structure, the heavy-weight sound impact value is improved up to 3 dB, and the light-weight sound impact value is moved up to 21 dB, comparing with the bare-slab. Also, the improved value for the floor impact sound conjugating with the sub-floor's ceiling was 5 dB. Based on this result, the 2nd assessment(performance test) was made the state that the rubber hardness of the sub-floor support was ranged between 50 and 70 for considering the stability of walking patients. In addition to this process, the assessment was carried out with a variety of ceiling structure applied to the dry double-floor structure with the air flow system on the sub-floor's ceiling. The result for the 2nd assessment proved that TYPEII-3 had the better sound reduction performance in the heavy-weight impact sound test than other types, and also for the light-weight impact sound TYPEII-3 had the 29 dB sound reduction performance overall. Henceforth, based on the result the research for the sound reduction performance from the floor impact sound shall be ongoing process as well as the development of a double-dry floor and a sound reduction ceiling to suitable on the field.
A Haptic Master-slave Robot System : Experimental Performance Evaluation for Medical Application
Oh, Jong-Seok ; Shin, Won-Ki ; Nguyen, Phuong-Bac ; Uhm, Chang-Ho ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 41~48
DOI : 10.5050/KSNVE.2013.23.1.041
In this work, 4-DOF ER haptic master is proposed and integrated with a slave robot for minimally invasive surgery(MIS). Using a controllable ER fluid, the haptic master can generate a repulsive force/torque with the 4-DOF motion. For realization of master-slave robot system, the motion command of the haptic master is realized by slave surgery robot. In order to follow the 4-DOF motion of the haptic master, novel mechanism of slave surgery robot with gimbal joint is devised. Accordingly, the haptic master-slave robot system is established by incorporating the slave robot with the haptic master device in which the desired repulsive force/torque and position are transferred to each other via wireless communications. In order to obtain the desired force/torque and position trajectories, tracking controllers for haptic master and slave robot are designed and implemented, respectively. It has been demonstrated that the desired effective torque tracking control performance is well achieved using the proposed haptic master-slave robot system.
Structural Analysis and Measuring Locations of Upper Guide Structure Assembly in APR1400
Ko, Do-Young ; Kim, Kyu-Hyung ; Kim, Sung-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 49~55
DOI : 10.5050/KSNVE.2013.23.1.049
A reactor vessel internals comprehensive vibration assessment program(RVI CVAP) of an advanced power reactor 1400(APR1400) is being performed as a non-prototype category-2 type of reactor based on the US nuclear regulatory commission regulatory guide(NRC RG) 1.20. The aim of this paper is to present the results of structural response analysis and measuring locations of a upper guide structure(UGS) assembly of the APR1400 reactor. The analysis results of the UGS assembly show that the specified integrity levels meet the design acceptance criteria. Also, the measuring locations are determined by the analysis results of the UGS assembly and selection criteria of previous study. These analysis results and measuring locations will be used as a guide to design a measurement system for the APR1400 RVI CVAP.
The Influence of Design Factors of Sonar Acoustic Window on Transfer Function of Self Noise due to Turbulent Boundary Layer
Shin, Ku-Kyun ; Seo, Youngsoo ; Kang, Myengwhan ; Jeon, Jaejin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 56~64
DOI : 10.5050/KSNVE.2013.23.1.056
Turbulent boundary layer noise is already a significant contributor to sonar self noise. For developing acoustic window of sonar system to reduce self noise, a parametric study of design factors of acoustic window is presented. Distance of sensor array from acoustic window, materials of acoustic window and characteristics of damping layer are studied as design factors to influence in the characteristics of the transfer function of self noise. As the result, these design factors make change the characteristics of transfer function slightly. Among design factors the location of sensor array is most important parameter in the self noise reduction
Design of Stiffeners for Reducing Resonant Vibration of Large Vertical Pumps and Its Performance Verification
Ryu, Kil-Su ; Bong, Suk-Keun ; Han, Seung-Woo ; Roh, Cheol-Woo ; Lee, Dong-Min ; Lee, Jung-Woo ; Park, Junhong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 65~72
DOI : 10.5050/KSNVE.2013.23.1.065
This case study presents a practical method to reduce resonant vibration of large vertical pumps. The pumps are driven at 400 rpm rated speed by induction motor. The vibration was not significantly large when operated at this rated speed. Large vibration was occurred when the pump was operated below the rated speed for flow control. Due to the large vibration resonance, variable speed operation of the pump was not possible for several months at worst cases. To find an efficient vibration control method, the flexural responses of pumps for both normal and transient operations were measured. The measured modal characteristics were compared with those of finite element analysis. When the pump was operated at a specific rpm, the natural mode whose resonance frequency is twice the rotating angular speed induced the large vibration. The retrofit utilizing stiffeners to reduce this resonant vibration were performed. Effects of designed stiffeners on reducing vibration were validated through tests after actual installation.
Sound Metric Design for Quantification of Door Closing Sound Utilizing Physiological Acoustics
Shin, Tae-Jin ; Lee, Seung-Min ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 73~83
DOI : 10.5050/KSNVE.2013.23.1.073
In previous works, psychoacoustic parameters have been used for objective quantification. However, these parameters do not agree well with subjective assessment. Therefore, the correlation between psychoacoustic parameters and the subjective rating of door closing sounds of sampled cars is low, and it is not sufficient to use psychoacoustic parameters as an objective metric to quantify the sound quality of door closing sounds. In this paper, a new method is proposed to objectively quantify the sound quality based on physiological acoustics and statistical signal processing. The gammatone filter, as a pre-processing, is used in models of the auditory system and kurtosis, which is the fourth-order moment of temporal signal, and is used to extract information about sound quality quantification for door closing sounds. The new metric obtained through the proposed method is highly correlated with subjective rating, and it is successfully applied to the quantification of the sound quality of door closing sounds.
2D and 3D Topology Optimization with Target Frequency and Modes of Ultrasonic Horn for Flip-chip Bonding
Ha, Chang Yong ; Lee, Soo Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 1, 2013, Pages 84~91
DOI : 10.5050/KSNVE.2013.23.1.084
Ultrasonic flip-chip bonding needs a precise bonding tool which delivers ultrasonic energy into chip bumps effectively to use the selected resonance mode and frequency of the horn structure. The bonding tool is excited at the resonance frequency and the input and output ports should locate at the anti-nodal points of the resonance mode. In this study, we propose new design method with topology optimization for ultrasonic bonding tools. The SIMP(solid isotropic material with penalization) method is used to formulate topology optimization and OC(optimal criteria) algorithm is adopted for the update scheme. MAC(modal assurance criterion) tracking is used for the target frequency and mode. We fabricate two prototypes of ultrasonic tools which are based on 3D optimization models after reviewing 2D and 3D topology optimization results. The prototypes are satisfied with the ultrasonic frequency and vibration amplitude as the ultrasonic bonding tools.