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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 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
Dynamic Analysis of FCEV Turbo Blower
Yook, J.Y. ; Yang, H.S. ; Lee, C.H. ; Cho, K.S. ; Kim, K.I. ; Kwon, H.R. ; Park, Y.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 591~598
DOI : 10.5050/KSNVE.2011.21.7.591
This paper presents dynamic analysis of FCEV(fuel cell electric vehicle) turbo blower. To analyze the dynamic characteristics of turbo blower, FEA(finite element analysis) and experimental test are performed. Evaluations of stress safety for rotor sleeve and impeller due to rotational force and shrink fit are performed. Rotor dynamic analysis is conducted by Campbell diagram and structure vibration analyses are performed using FEA and experimental test. Through these results, noise sources of turbo blower are verified.
Seismic Performance Evaluation of Cone-type Friction Pendulum Bearing System Using Shaking Table Test
Jeon, Bub-Gyu ; Chang, Sung-Jin ; Kim, Nam-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 599~608
DOI : 10.5050/KSNVE.2011.21.7.599
FPS(friction pendulum system) is an isolation system which is possible to isolate structures from earthquake by pendulum characteristic. Natural frequencies of the structures could be determined by designing the radius of curvature of FPS. Thus, response vibration could be reduced by changing natural frequency of structures from FPS. But effective periods of recorded seismic wave were various and estimation of earthquake characteristic could be difficult. If effective periods of seismic wave correspond to natural frequency of structures with FPS, resonance can be occurred. Therefore, CFPBS(cone-type friction pendulum bearing system) was developed for controlling the acceleration and displacement of structure by the slope of friction surfaces. Structural natural frequency with CFPBS can be changed according to position of ball on the friction surface which was designed cone-type. Therefore, superstructures on CFPBS could be isolated from earthquake. In this study, seismic performance of CFPBS was evaluated by numerical analysis and shaking table test.
Indoor Noise Analysis of Naval Combat Service Support Boat
Park, Mi-You ; Han, Hyung-Suk ; Cho, Heung-Gi ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 609~614
DOI : 10.5050/KSNVE.2011.21.7.609
The ship working environment of combat service support boat is much inferior to the ground working environment. For this reason, the crew of a combat service support boat suffer from an occupational disease such as hardness of hearing. Owing to its small size and low status, the improvement of its working and residential environment was occasionally ignored and its indoor noise was not fully investigated. In this study, for improving its residential environment indoor, the indoor noise of its shipboard compartments was analysed. These studies define the indoor noise level of combat service support boat is very high and some of indoor noise is exceeded the criteria for ship noise. Compared with marine police vessels, the indoor noise levels of marine police vessels are higher than the level of combat service support boat.
Research on the Characteristics and Measures of Noise Exposure on Worker Wearing Acoustic Devices
Kim, Kab-Bae ; Yoo, Kye-Mook ; Lee, In-Seop ; Chung, Kwang-Jae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 615~621
DOI : 10.5050/KSNVE.2011.21.7.615
There are hundreds of thousands call center workers wearing acoustic device. However, researches and noise exposure measurements on the noise transmitted from acoustic devices have seldom been performed due to the difficulty of measurement and to the absence of the measuring method in Korea. The aim of this study is to set up management measures to protect hearing loss on the call operator by acquiring measurement data of noise transmitted from the headset. Noise exposure measurements of 17 operators were performed in 7 call centers and head and Torso simulator method in compliance with the ISO standard 11904-2 was used for the measurement of noise transmitted from the headset. Sound pressure levels(SPL) transmitted from the headset were 73.2~86 dB(A). The operator exposed to the highest SPL set up his volume control at 9 which was the highest volume level. The volume control level, adjustable from 1 to 9, could be identified 12 out of 17 operators and the range of volume levels was 4.5~9. As a result of pearson correlation analysis, the correlation between volume level and SPL transmitted from the headset showed high relation as significance at the 0.672 level(p<0.05). To protect hearing loss of call center operators, it is more practical and effective measure to limit the volume level below the noise exposure level, i.e. 85 dB(A), rather than to carry out noise monitoring considering cost-effective aspect.
Effects of Stiffeners on Vibro-acoustic Response of Rectangular Flat Plate
Park, Jeong-Won ; Kim, Dong-Kyu ; Koo, Man-Hoi ; Park, Jun-Hong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 622~628
DOI : 10.5050/KSNVE.2011.21.7.622
The purpose of this study was to analyze the vibro-acoustic characteristics of a stiffened rectangular plate at high frequencies. The stiffeners attached along the plate surface were assumed to have rotational and translational stiffness and inertia. The harmonic response of the stiffened plate were predicted and compared using the Rayleigh-Ritz method with two different trial functions - polynomial and beam functions. The variation of the spatially averaged mean square velocity and the modal characteristics with the number of stiffeners were obtained. The use of the beam function ensured fast convergence which was essential for analyzing the high frequency vibration responses. Using the calculated modal characteristics and the Rayleigh-integral, the radiated sound power was predicted, and the effects of stiffeners were investigated. The proposed model can be applied to study optimal layout of stiffeners for minimal noise generation of the stiffened structures.
A Study on the Characteristics of Electroencephalogram for the Evaluating Words of Soundscape Sound Source When Visual Information is Suggested
Song, Min-Jeong ; Shin, Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 629~636
DOI : 10.5050/KSNVE.2011.21.7.629
In this study, survey experiment and EEG test was carried out to know the effect of visual images on EEG for evaluating words of soundscape sound source with 18 subjects. Analysis on the EEG were executed to know the difference according to with and without visual images. Followings are results of this study. 1) There is no big difference with visual images in soundscape sound evaluating adjectives such as "Full", "Clear", "Enjoyable" whereas there is a big difference in soundscape sound evaluating adjectives such as "Pleasant", "Comfortable", "Gentle", "Sonorous". 2) There is a tendency that soundscape sound source which is consist of single sound source shows + 1 above increase in survey test when visual image is suggested whereas soundscape sound source which is consist of one more sound source shows - 1 below decrease in survey test. 3) Statistical analysis was used to know considerable probability.
-wave has a considerable probability and Maximum level difference occurring brain spots were number 1 and 2.
The Derailment Safety Estimation of DMT Freight for Real Track Condition
Son, Myoung-Sun ; Eom, Beom-Gyu ; Lee, Hi-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 637~642
DOI : 10.5050/KSNVE.2011.21.7.637
The DMT freight is judged that economic performance is good because can increase cargoes than existing freight. However, the existing freight cars, each with a different balance to the body structure is bogie because the vibrations may occur. Thus, by minimizing vibration over the existing freight securing the safety of the driving if you will not have major problems in cargoes. In this study, multi-body dynamic analysis tool, VI-Rail using the actually Gyeongbu Railroad line and an empty, full freight condition include curve radius, track irregularity, The DMT freight of the derailed wagons were assessed for safety analysis. Full and empty freight conditions for parity in the Gyeongbu Railroad line(Dongdaegoo
Kyungsan) derailment safety analysis, such as derailment coefficient and the wheel unloaded, echoing the curve and the orbit is affected by the irregularity was found. Full freight condition than the empty conditions showed a significant derailment safety. Overall, the limits of derailment coefficient(Q/P = 0.8) and wheel unload decrement limits(
= 0.6) is less safe with me confirmed that the derailment safety.
Vibration Control of Stiffened Hull Structure Using MFC Actuator
Jeon, Jun-Cheol ; Sohn, Jung-Woo ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 643~649
DOI : 10.5050/KSNVE.2011.21.7.643
This work presents an active vibration control of a stiffened hull structure using a flexible macro fiber composite(MFC) actuator. As first step, the governing equation of the hull structure is derived in a matrix form and its dynamic characteristics such as natural frequency are obtained via a finite element analysis(FEA). The natural frequencies obtained from the FEA are compared with those determined from experimental measurement. After formulating the control model in a state space representation, an optimal controller is designed in order to attenuate the vibration of the stiffened hull structure. The controller is then empirically realized through dSPACE and control responses are evaluated in time domain.
Psycho-acoustic Evaluation and Analysis of the Indoor Noise in Cabins of a Naval Vessel to Specify its Allowable Limit
Hong, Hyun-Soo ; Shim, Sang-Ryul ; Han, Hyung-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 650~656
DOI : 10.5050/KSNVE.2011.21.7.650
The noise inside a naval vessel is very important in considering the need for hearing protection, improving the working environment and maintaining good communications for crews living on board a naval vessel. The indoor noise of a ship usually is specified by the A-weighted sound pressure level, but other evaluating parameters are required to reflect human senses more effectively. This paper uses additional noise indices related to room acoustics, such as NR(noise rating), NC(noise criterion), RC(room criterion), PSIL(preferred speech interference level) and loudness level to evaluate the noise inside cabins on a naval vessel. Using these psychological noise indices, allowable limit of noise level in cabins is suggested through psycho-acoustic evaluation for the noise in cabins.
A Development of the Noise Quality Checking System EOL of the 6th Speed Automatic Transmission in the USA
Lee, Hyun-Ku ; Kim, Moo-Suk ; Hwang, Seon-Yang ; Yoo, Dong-Kyu ; Kang, Koo-Tae ; Lee, Tae-Hwi ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 657~664
DOI : 10.5050/KSNVE.2011.21.7.657
This paper shows a whole noise quality checking system for the new developed 6th speed automatic transmission manufactured in USA. Due to demand for manufacturing of the high NVH quality transmissions in the mass product line, some special checking system called EOL NVH is adapted. This EOL system is using vibration sensor and analysis technologies. Through adapting vibration analysis technologies and functions likewise RMS, crest factor, harmonics, peak, band and order tracking, various noise problems caused by wear, nick and deformations could be successfully detected and predicted. Therefore, automatic transmissions manufactured in the USA could get high NVH quality. The developing process described in this paper and results on EOL system will offer good guides to the engineers who built the next transmission factory.
Vibration Analysis of Expansion Joint based on Transfer Matrix Method Considering the Rotary Inertia
Shin, Dong-Ho ; Kim, Sang-Ho ; Yoon, Hyung-Ho ; Lim, Hee-Gon ; Oh, Jae-Eung ; Lee, Jung-Youn ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 665~673
DOI : 10.5050/KSNVE.2011.21.7.665
Simplified formulae for axial and bending natural frequencies of a bellows are developed using an equivalent thin-walled pipe model. The axial and bending stiffness of bellows is determined using lumped transfer matrix method. Transfer matrix method which includes the rotary inertia is used to calculate the natural frequencies for axial and lateral vibration. The result from the simplified formula are verified by those from as experiment result and a finite element analysis. This comparisons show good agreement with the each other.
CAE-based DFSS Study for Road Noise Reduction
Kwon, Woo-Sung ; Yoo, Bong-Jun ; Kim, Byoung-Hoon ; Kim, In-Dong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 7, 2011, Pages 674~681
DOI : 10.5050/KSNVE.2011.21.7.674
In the early phase of vehicle development, CAE is conducted as tool for vehicle performance assessment. To maintain acceptable road noise performance, solution for reduced vehicle sensitivity is required. Chassis interface dynamic stiffness characteristics are key component to isolating vibration and noise of road from the vehicle interior. This research provide how to set up the optimized dynamic characteristics under noise effect through DFSS study. CAE-based DOE is performed to build prediction math model, CMS process involves DOE to achieve very fast run times while giving results very comparable. Minimized 95th percentile of performance distribution is applied to minimize vehicle sensitivity and road noise levels variation during the optimization process. Finally, the results of optimization were reviewed for performance and robustness.