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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 24, Issue 12 - Dec 2014
Volume 24, Issue 11 - Nov 2014
Volume 24, Issue 10 - Oct 2014
Volume 24, Issue 9 - Sep 2014
Volume 24, Issue 8 - Aug 2014
Volume 24, Issue 7 - Jul 2014
Volume 24, Issue 6 - Jun 2014
Volume 24, Issue 5 - May 2014
Volume 24, Issue 4 - Apr 2014
Volume 24, Issue 3 - Mar 2014
Volume 24, Issue 2 - Feb 2014
Volume 24, Issue 1 - Jan 2014
Selecting the target year
A Study of Analytical Integrity Estimations for the Structure and Rotor System of an Emergency Diesel Generator
Kim, Chae-Sil ; Choi, Heon-Oh ; Jung, Hoon-Hyung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 79~86
DOI : 10.5050/KSNVE.2014.24.2.079
This paper describes an integrity evaluation method for emergency diesel generator(EDG) and rotor part of EDG. EDG is a very important equipment in the nuclear power plant(NPP). EDG supplies electricity to the safety-related equipments for the safety shut down of NPP in an emergency situation of earthquake. The safety of the rotor part of EDG is also important during seismic impact from earthquake. The finite element modelling of the EDG including rotor part was constructed. The modal analysis of EDG was firstly performed. The first natural frequency was calculated and revealed higher than the cutoff frequency of seismic spectrum. Then the stress analysis was done to compare with the allowable stress. The safety of the rotor part was investigated by the finite element analysis of the rotor and journal bearing interaction to find film thickness and critical speed. The seismic load was applied to rotor part in a manner that the load was a weighted static load. Analysis results showed that the maximum stress was within the range of allowable stress and the film thickness is larger than the permissible minimum thickness, and the critical speed was out of the operating speed. Hence, the structural and dynamic integrity of EDG could be confirmed by the numerical analysis method used in this paper. However, dynamic analysis of a rotating rotor and supporting bearing with the seismic impact needs to be investigated in a more rigorous method since the seismic load to the rotating part complicates the behavior of rotating system.
Broadband Piezoelectric Vibration Energy Harvester Using Pole-Zero Cancellation Technique
Kim, Gi-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 87~92
DOI : 10.5050/KSNVE.2014.24.2.087
This paper presents a new design for a piezoelectric energy harvester with the potential to harvest vibration energy over a wide range of excitation frequencies, particularly beyond the resonance frequency. The piezoelectric vibration energy harvester employs the concept of pole-zero cancellation occurring in a lever type anti-resonant system. The experimental results show that the proposed energy harvester can provide the potential possibility of a broadband piezoelectric vibration energy harvester.
A New Extraction Method for the Radiation Efficiency and Radiation Directional Coefficient
Jung, Woo-Jin ; Lee, Jong-Ju ; Kang, Myung-Hwan ; Jeon, Jae-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 93~101
DOI : 10.5050/KSNVE.2013.24.2.093
Underwater radiated noise is the key in acoustic stealth performance of modern naval ships. The underwater radiated noise predicted by the hull vibration with radiation efficiency cannot always give the information of radiation pattern which is essential to analyze of detection probability by enemy and to improve the operational performance of the naval ship. The radiation pattern of underwater radiated noise is able to be obtained with radiation efficiency and radiation directional coefficient. In this paper, a new method to extract the radiation efficiency and radiation directional coefficient is suggested and proved with the simulation and experiment by using cylindrical shell of 70 cm diameter in air.
Vibration Reduction of Forklift Truck Using Optimization of Engine Mount Layout
Kim, Younghyun ; Kim, Kyutae ; Lee, Wontae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 102~107
DOI : 10.5050/KSNVE.2013.24.2.102
The engine excitation forces are considered as major vibration source for the forklift truck, especially in small class. Even though the current engine mounting system designs are acceptable for vibration isolation, the performance of the engine mounting system is still required for the tendency of light weight, higher power and driver's higher vibration requirement. In this paper vibration reduction technique of forklift engine which is supported on rubber mounts is presented. Based on the dynamic model of resilient engine mounting system, design evaluation program is established. The design optimization technique and evaluation method of system properties are discussed. Effects of optimal design are validated through comparison with test results.
The Development and Application of Sound Quality Index for the Improving Luxury Sound Quality of Road Vehicle Power Window System
Kim, Seonghyeon ; Park, Dong Chul ; Jo, Hyeonho ; Sung, Weonchan ; Kang, Yeon June ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 108~116
DOI : 10.5050/KSNVE.2013.24.2.108
With the increasing the importance of emotional quality of vehicle, the sound quality of systems with electric motor components has become increasingly important. Electric motors are used for windows, seats, sun roof, mirrors, steering columns, windshield wiper and climate control blowers, etc. In this paper, a study was conducted to identify sound quality factors that contribute to customer's satisfaction and preference of the window lift system. Jury test for subjective evaluation was carried out and sound quality index was developed. Averaged sound pressure level and sharpness were significant factors when glass moves down. Also, maximum loudness at stop section and averaged loudness were significant factor when glass moves up. Next, noise source identification was carried out using beam forming method during glass transferred section and impulsive noise at stop section. Several improvement methods were applied using the source identification result. And finally, the degree of sound quality improvement was judged using sound quality index.
A Study on Reducing Vibration of Washing Machine Using Gyroscope System
Na, Gyusung ; Park, Youngjin ; Park, Youn-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 117~122
DOI : 10.5050/KSNVE.2013.24.2.117
A novel method to reduce the vibration of drum type washing machine is proposed. Recently, as the capacity of the drum-type washing machine gets expanded and its washing performance is improved, its market share is increasing in the whole world. But, the capacity of washing machine is limited because of door size and built-in washing machine size. The vibration of washing machine is caused by unbalanced cloths in high spining drum, and the displacement of tub is maximized at transient range about 3 Hz(180 rpm). Previous researches were concerned about steady-state vibration in spinning. In this study, concerned about transient vibration and the displacement of tub is decreased by using gyroscope system. Mutibody dynamic model of washing machine include gyroscope is designed and the vibration of tub have been reduced by 44.7 % over original.
Development and Application of Phased Array System for Defect Imaging in Plate-like Structures
Lee, Joo Kyung ; Kwon, Young Eui ; Lee, Heung Son ; Seung, Hong Min ; Kim, Ki Yeon ; Lee, Jun Kyu ; Kim, Hoe Woong ; Lee, Ho Cheol ; Kim, Yoon Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 123~130
DOI : 10.5050/KSNVE.2013.24.2.123
An ultrasonic magnetostrictive transducer-based phased-array system for imaging defects in plate structures is newly proposed. In that most ultrasonic phased array systems rely on piezoelectric transducers or electromagnetic acoustic transducers, this system has its own unique feature of employing magnetostrictive transducers. Interest in using a phased array system using magnetostrictive transducers has been recently reported for pipe inspection but no such system has been developed for plate inspection. In this investigation, we aim to propose a phased array system using OL-MPTs (Omnidirectional Lamb wave Magnetostrictive Patch Transducers) for plate inspection. The developed system consists of a multi-channel function generator, power amplifiers, preamplifiers and a data acquisition unit. In the process of its development, each of the units must be checked and in doing so, we suggest types of ultrasonic wave experiments that should be carried out. Finally, the phased system using a transducer array composed of eight OL-MPTs is newly configured and is applied for actual crack detection experiments.
A Technique for Vibration Measurement and Roundness Assessment of Rotating-axis using Camera Image
Son, Ki-Sung ; Jeon, Hyeong-Seop ; Park, Jin-Ho ; Park, Jong Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 131~138
DOI : 10.5050/KSNVE.2013.24.2.131
Vibration measurement of rotating shafts by installing sensors such as accelerometers or displacement sensors is costly and dangerous in some cases. As an alternative method, vibration measurement using camera images has been researched because sensor installation is not needed and displacement of a rotating shaft can be directly evaluated. This paper also suggests the enhanced technique applicable to the measurement of vibration of a large-scale rotating shaft. The concurrent methods based on camera images use marks, which are hardly applicable to rotating shafts. The proposed method measures vibration without any marks by evaluating shape errors. The working principle of the method is described and verified by a series of experiments.
Design and Implementation of Periodic Disturbance Compensators for Track Following Servo Systems
Jeong, Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 139~145
DOI : 10.5050/KSNVE.2013.24.2.139
Periodic disturbance compensators are widely used in track following servo systems. They are commonly designed and implemented by adaptive feedforward compensators or internal model based compensators. In track following servo systems, the gains of the compensators should be determined considering the change of the sensitivity transfer function and the implementation methods should be selected considering the system environment. This paper proposes a guide for determining gains of the periodic disturbance compensators. Various simulation and experimental results are presented to see the effect of gains. In addition, this paper introduces the various types of implementation methods and compares their merits and demerits.
Evaluation of Speech Privacy on the Seat-design in High-speed Train Passenger Cars
Jang, Hyung Suk ; Kim, Jae Hyeon ; Jeon, Jin Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 146~153
DOI : 10.5050/KSNVE.2013.24.2.146
This study investigates the effects of seat-design elements such as seating arrangement, shape, and height on speech privacy in high-speed trains. For the evaluation of speech privacy, acoustic simulation software was used to reproduce room acoustical conditions in passenger cars on the basis of in-situ measurement data. The influences of speech source directivity and source height on privacy distance (
) were investigated, and it was found that
determined using an omni-directional source was relatively shorter than that determined using a directional source. It was also found that
decreased when the source height was lower than the height of the seat-back because the seat-back blocked the propagation of speech from the sound source. The effect of seating arrangement was not significant when comparing the vis-a-vis seating and one-side seating arrangements. In addition, among the alternative seat-designs, the seats that block the space between the seats and cover the space near the ear were found to show significantly enhanced speech privacy in high-speed train passenger cars.
Analysis of Physical Characteristics of Sound Environment and the Subjective Reactions in Hanok Complexes
Shin, Yong-Gyu ; Park, Hyeon-Ku ; Kook, Chan ; Kim, Sun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 2, 2014, Pages 154~161
DOI : 10.5050/KSNVE.2013.24.2.154
Demands for Korean Traditional Residence Complexes as a more humane resident space have recently been increasing for the purposes of users' health and convenience, built with the purpose of reflecting various trends. This study is aimed at examining the physical characteristics of design in residence complexes by analyzing the physical characteristics of the sound environment as auditory elements of Hanok Complexes and the relationship between spatial and visual test values. The results were shown as follows: In subjective evaluation at Hanok, Natural sounds were recognized higher but artificial sounds were lower. According to the interrelationship analysis between subjective evaluation and physical measurement values, entrance (regular-StdDev), yard (regular-NbEm, friendly-G), waterside (regular-articulation index(rooms), StdDev,
, Rem), etc had been shown highly related.