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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 12, Issue 12 - Dec 2002
Volume 12, Issue 11 - Nov 2002
Volume 12, Issue 10 - Oct 2002
Volume 12, Issue 9 - Sep 2002
Volume 12, Issue 8 - Aug 2002
Volume 12, Issue 7 - Jul 2002
Volume 12, Issue 6 - Jun 2002
Volume 12, Issue 5 - May 2002
Volume 12, Issue 4 - Apr 2002
Volume 12, Issue 3 - Mar 2002
Volume 12, Issue 2 - Feb 2002
Volume 12, Issue 1 - Jan 2002
Selecting the target year
The Robust Design of Low Noise Intake System with Experimental 4-poles
Joe, Yong-Goo ; Oh, Jae-Eung ; Lee, You-Yub ; Kim, Heung-Seob ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 405~412
DOI : 10.5050/KSNVN.2002.12.6.405
Recently, regulations of the government and concerns of people give rise to the interest in exhaust and intake noise of passenger car as much as other vehicles. In these demands, performance prediction software with hybrid method was developed at first. Secondly, robust design was used for improving the noise reduction capacity of intake system with the performance prediction software. On the basis of the existing design, length and radios of each component that was thought to effect on the capacity of intake system was selected. The factors were arranged by using L18 table of orthogonal array and optimum value was obtained.
A Study on the Sound Resonating Barrier
Lee, Jun-Shin ; Kim, Tae-Ryong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 413~419
DOI : 10.5050/KSNVN.2002.12.6.413
Noise barriers are widely used to reduce the sound level propagating from highways, railways or factories to residential areas. The reduced noise level at a receiver point is then determined by the diffracted waves around the edge of the barrier as well as by the transmitted waves through the barrier. 1`or proper usage, many studies either theoretical or experimental have been made with the objective of precisely Predicting the acoustic field and improving the noise attenuating properties of barriers. In this study. a simple scattering model. a line acoustic source scattered by an infinite cylinder, is introduced to simply Investigate the sound attenuation efficiency of a sound-resonating barrier. From this model study, it is observed that the sound-resonating harrier can be used as a good sound-shielding element especially for the pure-tone noise generated from the transformer. Large sound-attenuation is achieved by applying the sound-resonating barrier to the large transformers in a substation.
A Study on the Establishment of the Environmental Noise Criteria for Aircraft
Kim, Sun-Woo ; Jang, Gil-Soo ; Lee, Soo-Gab ; Song, Min-Jeong ; Chang, Se-Myong ; Jeon, Ji-Hyun ; Ahn, Byung-Og ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 420~430
DOI : 10.5050/KSNVN.2002.12.6.420
Rating scales for environmental noise are varied in their calculation procedure. Among them WECPNL (weighted equivalent continuous perceived noise level) is the rating scale for aircraft noise currently being used in domestic and applied only for aircraft noise. However
is used as a rating scale for not only aircraft noise but also environmental noise. Besides, it is easy to calculate and internationally preferred. It is, therefore, not adequate for the evaluation of residents` exposure. Moreover it is very difficult to measure the aircraft noise by WECPNL due to the complicated calculating procedures if automatic measuring system is not used. Accordingly. this study aims to propose alternative evaluation procedure for the aircraft noise. To achieve this purpose, the data measured by automatic measuring system were gathered and calculated with three evaluation procedures : WECPNL
, and the results calculated from different methods were compared and analyzed.
Reducing the Interior Noise of the Korean High-speed Train Using Geometric Acoustic Method
Kim, Kwan-Ju ; Park, Jin-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 431~436
DOI : 10.5050/KSNVN.2002.12.6.431
The interior sound pressure level of the Korean high-speed train(KHST) is predicted by geometrical acoustic method. For the Purpose of assuring the prediction of Interior noise of KHST by the geometrical acoustic scheme, calculated sound level values of the Korean train express(KTX) by Identical geometrical method are compared with measured values of KTX prototype vehicle by experiment. Contribution of individual sound source of KHST vehicle Into the interior response positions is calculated and sound sources are classified in influential order. Hence, it is reasonable approach to reduce sound power of most contributing noise source first. Sensitivity of the interior response position`s sound pressure level (SPL) with respect to train wall sections` transmission loss are carried on and acoustically sensitive spot is identified, for example window area for passenger cabin case. Those contribution and sensitivity analysis results are suggested to design quieter train efficiently.
Perceptual Evaluation of Noise Sources in a Chamber for Residential and Working Environment
Jeon, Jin-Yong ; Kim, Kyong-Ho ; Jung, Jeong-Ho ; Ryu, Jong-Kwan ; Cho, Moon-Jae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 437~444
DOI : 10.5050/KSNVN.2002.12.6.437
This paper is to provide the basic way of a acoustical evaluation and efficient control noise by investigating the limits of perceptual loudness of living environment and by finding out any correlation between Physical characteristics of noise and psychoacoustic parameters. The limits of perceptual loudness were selected by the subjects in a chamber for residential and working environment. And the noise sources were analyzed to find out whether there is any correlation with Zwicker parameters and ACF factors. In this study especially, to set up the domestic evaluation grade about floor impact noise. we`d like to suggest the loudness Perception research result as fundamental resource for setting up the evaluation grade through the result that is based on annoyance. In the result of this research, upper limit of heavy-weight impact noise was L-60, and lower limit of it was L-50. On the other hand, upper limit of light-weight impact noise was L-70, and lower limit of it was L-55. It seemed that the loudness of noise from vacuum cleaner noise does not affect its perceived noisiness. Noises implicated In human such as floor walking noise and talking sound, are the most irritating noise in office environment.
Dissipation Effects Induced by Substructures Comprised of Multiple oscillators
Choi, Sung-Hoon ; Kim, Yang-Hann ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 445~452
DOI : 10.5050/KSNVN.2002.12.6.445
The goal of this paper Is to characterize the vibration damping induced in a main structure by a large number of sub-oscillators. A simple expression is obtained for the substructure impedance when the number of sub-oscillators approaches Infinity. It is found that the induced damping depends on the total mass of the sub-oscillators resonating in a frequency band of interests and nearly independent of their Individual loss factors. A modal overlapping condition. which corresponds to bandwidths that exceed the spacing of those natural frequencies, is required for the sub-oscillators to have such effects. An impulse response of the system is also considered. When the sub-oscillators lack damping and do not satisfy the modal overlapping condition, the vibratory energy is returned from the sub-oscillators to the main structure at later times. The result of this paper is consistent with that found with the fuzzy structure and SEA framework.
Suggestion of Vibration Criteria for Fresh Concrete Considering Early Strength Increase
Park, Sun-Joon ; Park, Yeon-Soo ; Kang, Sung-Hoo ; Kim, Hong-Ki ; Kim, Eung-Rok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 453~460
DOI : 10.5050/KSNVN.2002.12.6.453
In this paper, vibration criteria for fresh concrete are suggested considering relationship of strength and ages of concrete. Vibration criteria of fresh concrete subjected to construction vibration are not to be certain in abroad countries without question within a country. Before 12 hours cured, vibration criterion is suggested 0.25 cm/s. Used 4.0 cm/s by vibration criterion after 28 days. And the interval extent used relation with strength and ages of concrete. Vibration criteria proposed in this paper are thought may satisfy properties of fresh concrete as well as generally used those in domestic. Also, the actual ground vibrations due to pile driving have been measured, and data are analyze using the nitration equation applying to reliability index.
Efficient Optimization of the Suspension Characteristics Using Response Surface Model for Korean High Speed Train
Park, C.K. ; Kim, Y.G. ; Bae, D.S. ; Park, T.W. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 461~468
DOI : 10.5050/KSNVN.2002.12.6.461
Computer simulation is essential to design the suspension elements of railway vehicle. By computer simulation, engineers can assess the feasibility of the given design factors and change them to get a better design. But if one wishes to perform complex analysis on the simulation, such as railway vehicle dynamic, the computational time can become overwhelming. Therefore, many researchers have used a surrogate model that has a regression model performed on a data sampling of the simulation. In general, metamodels(surrogate model) take the form y(
, where y(
) is the true output, f(
) is the metamodel output, and is the error. In this paper, a second order polynomial equation is used as the RSM(response surface model) for high speed train that have twenty-nine design variables and forty-six responses. After the RSM is constructed, multi-objective optimal solutions are achieved by using a nonlinear programming method called VMM(variable matric method) This paper shows that the RSM is a very efficient model to solve the complex optimization problem.
An Experimental Study on the Building Vibration Control Using Orificed Fluid Dampers
Chung, Tae-Young ; Lim, Chae-Wook ; Kim, Byung-Hyun ; Moon, Seok-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 469~477
DOI : 10.5050/KSNVN.2002.12.6.469
An orificed fluid damper(OFD) having the capacity of about 2 tons was designed and fabricated, and series of tests were performed to grasp the fundamental performance characteristics of it. Several important findings were observed and introduced in this paper. It was applied to a 6-story steel structure under random excitation and seismic excitation for the confirmation of its validity on structural vibration absolution. The experimental results demonstrated that the addition of an OFD to the test structure is very effective in reduction of vibration level of the higher modes as well as the fundamental mode. Maxwell model was adopted to describe the frequency-dependent characteristics of the fabricated OFD and the numerical simulation was carried for the test structure. It was confirmed that the experimentally and numerically simulated results agree well.
Development of an Enhanced Artificial Life Optimization Algorithm and Optimum Design of Short Journal Bearings
Yang, Bo-Suk ; Song, Jin-Dae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 12, issue 6, 2002, Pages 478~487
DOI : 10.5050/KSNVN.2002.12.6.478
This paper presents a hybrid method to compute the solutions of an optimization Problem. The present hybrid algorithm is the synthesis of an artificial life algorithm and the random tabu search method. The artificial life algorithm has the most important feature called emergence. The emergence is the result of dynamic interaction among the individuals consisting of the system and is not found in an individual. The conventional artificial life algorithm for optimization is a stochastic searching algorithm using the feature of artificial life. Emergent colonies appear at the optimum locations in an artificial ecology. And the locations are the optimum solutions. We combined the feature of random-tabu search method with the conventional algorithm. The feature of random-tabu search method is to divide any given region into sub-regions. The enhanced artificial life algorithm (EALA) not only converge faster than the conventional artificial life algorithm, but also gives a more accurate solution. In addition, this algorithm can find all global optimum solutions. The enhanced artificial life algorithm is applied to the optimum design of high-speed, short journal bearings and its usefulness is verified through an optimization problem.