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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 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
Analytical & Experimental Study on Microvibration Effects of Satellite
Park, Geeyong ; Lee, Dae-Oen ; Yoon, Jae-San ; Han, Jae-Hung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 5~13
DOI : 10.5050/KSNVE.2014.24.1.005
Number of components and payload systems installed in satellites were found to be exposed to various disturbance sources such as the reaction wheel assembly, the control moment gyro, coolers, and others. A micro-level of vibration can introduce jitter problems into an optical payload system and cause significant degradation of the image quality. Moreover, the prediction of on-orbit vibration effects on the performance of optical payloads during the development process is always important. However, analyzing interactions between subsystems and predicting the vibration level of the payloads is extremely difficult. Therefore, this paper describes the analytical and experimental approach to microvibration effects on satellite optical payload performance with integrated jitter analysis frame-work, microvibration emulator and satellite structure testbed.
Modeling and Bifurcation Analysis of the 2D Airfoil with Torsional Nonlinearity
Lim, Joosup ; Lee, Sang-Wook ; Kim, Sung-Joon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 14~20
DOI : 10.5050/KSNVE.2014.24.1.014
Recent developments for high altitude, long endurance conventional UAVs(HALE UAVs) have revealed new issues regarding aircraft structure design and analysis. First of all, due to intensive mission requirements, the structures of HALE UAVs have lightweight and very flexible main wing with high aspect ratio, and slender fuselage. For this kind of structures, aeroelastic characteristics are different from conventional aircrafts. Hence, currently developed analysis methods are not suitable to fully understand strucutral dynamics of the very flexible aircraft, and to guarantee structural reliability. Therefore, various structural studies considering nonlinear behaviors which are generally ignored for the conventional aircraft strucutral analyis have been attracting researchers interests. Nonlinear flutter of the very flexible wing is one of the subject to be studied in combination with strong coupling between aeroelastic characteristics and flight dynamics. Herein, as preliminary study, modeling and nonlinear system analysis of the 2D airfoild with torsional nonlinearity have been discussed.
A Study on the Approximate Formula for Radiation Efficiency of a Simply Supported Rectangular Plate in Water
Kim, Hyun-Sil ; Kim, Jae-Seung ; Kim, Bong-Ki ; Kim, Sang-Ryul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 21~27
DOI : 10.5050/KSNVE.2013.24.1.021
In this paper, an approximate formula for radiation efficiency of the plate surround by an infinite rigid baffle is studied. The plate is simply supported and one side is in contact with air, while other side with water. By assuming an infinite plate, the fluid loading effect is derived in terms of an effective mass. Based on the observation that the fluid loading effect decreases as frequency increases, the radiation efficiency formula at high frequency, which was originally derived for a plate vibrating in the air, is modified as the approximate formula for a submerged plate. The fluid loading effect is taken into account in the wavenumber of the plate. Comparisons of the approximate formula with the numerical results shows that they match well except the mid-frequency range in which numerical results show many oscillations. In numerically solving the fully coupled equations of motion, fourfold integrals of the impedance coefficients are reduced to single nonsingular integrals, which results in substantial reduction in computing time.
Investigation of Friction Noise with Respect to Friction Curve by Using FEM and Its Validation
Nam, Jaehyun ; Kang, Jaeyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 28~34
DOI : 10.5050/KSNVE.2014.24.1.028
This study provides the numerical finite-element method(FEM) estimating the friction noise induced by the negative slope in the friction-velocity curve. The friction noise due to the friction-velocity curve is experimentally investigated through the pin-on-disk setup. The measured squeal frequency is estimated by FEM. The friction curve is measured by the friction test, then it is applied to the complex eigenvalue analysis. The results shows that the experimental squeal frequency can be determined by the FEM analysis. Also, it is emphasized that the negative friction-velocity slope is essential in generating friction noise in the pin-on-disc system.
An Experimental Study to Improve Measurement Reliability for the Airborne Sound Insulation Performance by Laboratory Test
Kim, Hang ; Park, Hyeon Ku ; Ku, Hee Mo ; Kim, Sun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 35~44
DOI : 10.5050/KSNVE.2014.24.1.035
Sound pressure levels in the receiving room while testing airborne sound insulation performance are varied by the measuring points. This may increase the measurement error, then decrease the measurement reliability. With this reason the research has carried out on the method to reduce deviations of sound pressure level in the ISO type rectangular laboratory focusing on the measurement of airborne sound insulation performance. Tests were made to see the effect of sound absorption in the receiving room, loudspeaker locations, microphones locations and flanking transmission path. Consequently, it was resulted that sound absorption in the receiving room and the loudspeaker location have influence on the sound level deviations especially in the low frequency. The microphone location was very important to get measurement reliability. The effective measuring point, which the sound level difference with average sound pressure level is within 2 dB, could yield most reliable average sound pressure level. Therefore it is necessary to find the effective measuring points in the receiving room. Flanking transmission path should be sealed using sound absorber or magnet etc. to prevent from lowering the sound insulation performance.
Finite Element Analysis of High-speed Rotating Disks Considering Impulsive Loading by the Clearance and Contact
Lee, Kisu ; Kim, Yeong Sul ; So, Jae Uk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 45~53
DOI : 10.5050/KSNVE.2014.24.1.045
For the time integration solution of the impulsive dynamic contact problem of high-speed rotating disks formulated by the finite element technique, the velocity and acceleration contact constraints as well as the displacement contact constraint are imposed for the numerical stability without spurious oscillations. The solution of the present technique is checked by the numerical simulation using the concentric high-speed rotating disks with the clearance and impulsive loading. It is shown that the almost steady state solution agrees with the corresponding analytical solution of the elasticity and that the differentiated constraints are crucial for the numerical stability of such high-speed contact problems of the disks under impulsive loading.
Performance Evaluation of Driver Supportive System with Haptic Cue Gear-shifting Function Considering Vehicle Model
Han, Young-Min ; Sung, Rockhoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 54~61
DOI : 10.5050/KSNVE.2014.24.1.054
This paper proposes a driver supportive device with haptic cue function which can transmit optimal gear shifting timing to a driver without requiring the driver's visual attention. Its performance is evaluated under vehicle model considering automotive engine, transmission and vehicle body. In order to achieve this goal, a torque feedback device is devised and manufactured by adopting the MR (magnetorheological) fluid and clutch mechanism. The manufactured MR clutch is then integrated with the accelerator pedal to construct the proposed haptic cue device. A virtual vehicle emulating a four-cylinder four-stroke engine, manual transmission system of a passenger vehicle and vehicle body is constructed and communicated with the manufactured haptic cue device. Control performances including torque tracking and fuel efficiency are experimentally evaluated via a simple feed-forward control algorithm.
Active Noise Control for Target Point Inside Bore Using Property of MRI Noise
Lee, Nokhaeng ; Park, Youngjin ; Park, Youn-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 1, 2014, Pages 62~68
DOI : 10.5050/KSNVE.2014.24.1.062
Recently, MRI(magnetic resonance imager) scanner is continually used for medical diagnosis and many biomedical researches. When it operates, however, intense noise is generated. The SPL(sound pressure level) of the noise approaches 130 dB especially in 3 T(Tesla) MRI. Meanwhile, more than 3 T MRI scanners have been developed to get higher-resolution images, so louder noise is expected in the future. The intense noise makes patients feel nervous and uncomfortable. Moreover, it could possibly cause hearing loss to patient in extreme cases. For this reason, some active noise control systems have been researched. One of them used feedback Filtered-X LMS(FXLMS) algorithm which is able to control only narrowband noises and possible to diverge in severe case. In this paper, we determine the property of MRI noise. Using the property, we applied a method of open-loop and adaptive control for reducing MRI noise at target point inside bore. We verified performance of the method with computer simulation and preliminary experiment. The results demonstrate that the method can effectively reduce MRI noise at target point.