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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korean Society for Noise and Vibration Engineering
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
Editor in Chief :
Volume & Issues
Volume 15, Issue 12 - Dec 2005
Volume 15, Issue 11 - Nov 2005
Volume 15, Issue 10 - Oct 2005
Volume 15, Issue 9 - Sep 2005
Volume 15, Issue 8 - Aug 2005
Volume 15, Issue 7 - Jul 2005
Volume 15, Issue 6 - Jun 2005
Volume 15, Issue 5 - May 2005
Volume 15, Issue 4 - Apr 2005
Volume 15, Issue 3 - Mar 2005
Volume 15, Issue 2 - Feb 2005
Volume 15, Issue 1 - Jan 2005
Selecting the target year
Characteristics of Conventional Railroad Noise
Kang, Daejoon ; Lee, Wooseok ; Lee, Jaewon ; Hong, Junki ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 511~518
DOI : 10.5050/KSNVN.2005.15.5.511
The railroad noise has been considered as one of environment pollution and complaints about it have been increasing every year. Therefore, the establishment of railroad noise monitoring network is necessary. It will be designed for monitoring railroad noise, storing data of railroad noise continuously and providing the fundamental knowledge for the measures of railroad noise. For this, we investigated the actual condition and status of railroad noise according to distance around Daejeon, Daegu, Gwangju, and Busan. This paper shows the basic data that will be used for predicting the noise level near railroad in the environmental impact assessment.
Development and Evaluation for Improvement of the Sound Insulation of Balcony Window in Apartment
Kim, Ha-Geun ; Kim, Myung-Jun ; Oh, Jin-Kyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 519~526
DOI : 10.5050/KSNVN.2005.15.5.519
Recently, the interest on the comfortable dwelling environment is increasing and the effort to solve the problem of exterior noise was tried. The propose of this study is to suggest the design of balcony window in apartment and to evaluate the sound insulation of it. So, we designed five types of balcony window which were considered not only sound insulation but ventilation. The sound reduction index of window was evaluated by the measurement in mock-up room. The results showed that case 2 improved about 6 dB in the weighted apparent sound reduction index than case 1, and case 3 reduced about
in construction cost than case 4.
A Mathematical Formulation of the Structural-acoustic System with an Opening and a Flexible Structure
Seo, Hee-Seon ; Kim, Yang-Hann ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 527~535
DOI : 10.5050/KSNVN.2005.15.5.527
This paper explains a general coupling system in terms of the system parameters. impedance of a cavity or mobility of a structure. To easily access the mechanism of the structural-acoustic coupled system, a simple expression is derived. A general coupled equation is also derived of a general coupled problem constituted a flexible structure and an opening boundary in terms of vector and matrix notation, and is analyzed the coupling phenomena using the understanding acquired simple coupled system. The paper shows that the general coupled equation is expanded version of the simple coupled equation by some limiting checks. The paper also shows that the degree of coupling is proportioned to a stiffness of the acoustic system and a modal coupling coefficient, but is in inverse proportion to a mass of the structural system and the difference of the excitation frequency and resonant frequency of the acoustic or structural system.
Research for Performance Improvement of Impact Hammer Drill
Kim, Jeahwan ; Park, Cheolwoo ; Han, Sangyong ; Guan, Namjin ; Kang, Chungu ; Jung, Youngchae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 536~541
DOI : 10.5050/KSNVN.2005.15.5.536
This paper Presents the performance test of an impact hammer drill in conjunction with the parameter consideration of coefficient of restitution, lubrication and friction, pressure leakage, vibration damper and production quality. Novel measurement setups are innovated in order to get the Parameter data. The measured data are compared with the computational results, and this comparison gives a confidence on the computational model, which can be used for a optimal design of impact hammer drills.
Impact Power Characteristics as Behavior of Real Impact Source(Child)
Kim, Kyoung-Woo ; Choi, Gyoung-Seok ; Jeong, Young-Sun ; Yang, Kwan-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 542~549
DOI : 10.5050/KSNVN.2005.15.5.542
Impact sounds, such as those created by footsteps, the dropping of an object or the moving of furniture, can be a source of great annoyance In residential buildings. Running and jumping impact sound by child are one of the most irritating noises in an apartment buildings. It`s necessary to know that the impact power characteristics of real impact source in an apartment buildings. This study aims to Investigate the impact power characteristics and impact power time of running and jumping by child. This study carried out investigation through the 159 children in school. The results of this study is that jumping impact power is greater than running impact power.
A Study on the Evaluation Unit of a Military Aircraft Noise
Lee, Jun-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 550~557
DOI : 10.5050/KSNVN.2005.15.5.550
Korean `Law of Aviation` and `Test Method of Measuring Noise and Vibration` designate to use WECPNL metric based on
measurement for the accessment of aircraft noise in Korea. However, time duration of noise event can not be considered in
metric in principle, compensation on the duration has been utilized. A study was done recently to evaluate appropriate duration compensation for the accessment of military aircraft noise under current metric of WECPNL and
. This study was carried out to evaluate what metric is the most appropriate to express aircraft noise including time duration of single noise event, computing and comparing noise exposure with 1 second noise measurement data of military aircraft in
and SEL. This study shows SEL is the most appropriate noise metric for the evaluation of noise exposure with time duration such as aircraft noise without compensation. It is suggested to use SEL noise metric instead of
noise metric with duration compensation for the aircraft noise accessment either military aircraft or civilian aircraft.
A Questionnaire Research on the Subjective Sound Recognition
Shin, Yong-Gyu ; Shin, Hoon ; Kook, Chu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 558~563
DOI : 10.5050/KSNVN.2005.15.5.558
This research aims to derive the general emotion and preference of the 25 sounds by using the questionnaire method to provide the contents for the soundscape design fit to the characteristics of the given situation. The results can be summarized as follows : Nature sounds except dog barking and locust crying showed highest preference, and the traffic sounds, baby crying and footstep of upper floor showed the lowest. Hereby, the sound recognition can be different each other according to quality of tone and situation even they are the same sounds. The most impressive, wanted to be conserved and retrospective sound was the nature sound, and the most wanted to be removed sound was the machinery sound. And the social sound was shown as the most korean and fit to the art theme street.
A Study on Ultrasonic Sould-fields for Cleaning in a Pipe
Lee, Jung-Gu ; Kim, Jin-Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 564~570
DOI : 10.5050/KSNVN.2005.15.5.564
This paper presents some results of research for applying ultrasonic cleaning to an interior wall of cylindrical pipe. As the cleaning is achieved better for higher sound pressure, ultrasonic sound field in a cylindrical container is considered. The paper identifies nonuniform sound field established by the radiation of a cylindrical transducer driven at resonant frequency, Numerical analysis predicts the sound pressure distribution, and experiment verifies the trend of analysis results. Experiment observes the cleaning effect, and this paper suggests the possibility of using a cylindrical ultrasonic cleaning device.
A Study on the Improvement of Acoustic Absorption of Multiple Layer Perforated Panel Systems
Lee, Dong-Hoon ; Seo, Seong-Won ; Hong, Byung-Kuk ; Song, Hwa-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 571~577
DOI : 10.5050/KSNVN.2005.15.5.571
The acoustic absorption of multiple layer perforated panel systems is largely reduced at the anti-resonance frequency. In order to improve the acoustic absorption at the anti-resonance frequency, the sound absorbing materials are inserted between perforated panels. By the insertion of absorbing materials, it is found that the multiple layer perforated panel system has better acoustic absorption at the anti-resonance frequency and more broadband frequency. Besides, it is shown that the absorption coefficients from the transfer matrix method agree well with the values measured by the two-microphone impedance tube method for various combinations of perforated panels, airspaces or sound absorbing materials.
Estimation of Tracking Vibration Quantity for an Optimal Tracking Controller Design
Lee, Moon-Noh ; Jin, Kyoung-Bog ; Lee, Jong-KeuK ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 578~585
DOI : 10.5050/KSNVN.2005.15.5.578
In this paper, we present a schematic method estimating the tracking vibration quantity occurring in the track-following system of an optical recording device. A tracking loop gain adjustment algorithm is introduced to estimate accurately the tracking vibration quantity in spite of the uncertainties of the tracking actuator, Accordingly, the tracking vibration quantity can be estimated from the tracking error, the controller output, the nominal actuator model, and a compensated gain. An optimal tracking controller can be designed from a minimum tracking open-loop gain calculated by the estimated tracking vibration quantity The proposed vibration quantity estimation and controller design method are applied to the track-following system of an optical recording device and are evaluated through the experimental result.
Dynamic Behavior of Rotating Cantilever Pipe Conveying Fluid with Moving Mass
Yoon, Han-Ik ; Son, In-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 586~594
DOI : 10.5050/KSNVN.2005.15.5.586
In this paper, we studied about the effects of the rotating cantilever pipe conveying fluid with a moving mass. The influences of a rotating angular velocity, the velocity of fluid flow and moving mass on the dynamic behavior of a cantilever pipe have been studied by the numerical method. The equation of motion is derived by using the Lagrange`s equation. The cantilever pipe is modeled by the Euler-Bernoulli beam theory. When the velocity of a moving mass is constant, the lateral tip-displacement of a cantilever pipe is proportional to the moving mass and the angular velocity. In the steady state, the lateral tip-displacement of a cantilever pipe is more sensitive to the velocity of fluid than the angular velocity, and the axial deflection of a cantilever pipe is more sensitive to the effect of a angular velocity. Totally, as the moving mass is increased, the frequency of a cantilever pipe is decreased in steady state.
Vibration Control of Membrane with Tension Gradient Using Multiple Dynamic Absorber
Park, Chong-Hyun ; Kim, Sung-Dae ; Kim, Won-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 595~603
DOI : 10.5050/KSNVN.2005.15.5.595
In this work, the multiple dynamic absorber( MDA ) is introduced to reduce several vibration modes of shadow mask simultaneously and its design method is developed from the theory of the simple dynamic absorber. When designing the dynamic absorber, there are three significant design parameters such as mass, damping ratio and tuning frequency. Therefore the sensitivity analysis for those parameters has been executed in order to find out the design criteria of multiple dynamic absorber using the finite element model of shadow mask. The multiple dynamic absorber(MDA) designed by the proposed method is tested theoretically and experimentally to estimate the efficiency of vibration reduction. From the results, it is verified that the method is feasible to apply the system having the multiple nitration modes and more efficient than the thin wire-type damper used commercially to reduce the vibration of shadow mask.
2-Dimensional Floor Impact Vibration Analysis in Bare Reinforced Concrete Slab Using Finite Element Method
Seo, Sang-Ho ; Jeon, Jin-Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 604~611
DOI : 10.5050/KSNVN.2005.15.5.604
The relationship between floor impact sound and vibration has been studied by field measurements, and the vibration modal characteristics have been analyzed. Vibration levels impacted by a standard heavy-weight impact source have been predicted according to the main design parameters using finite element method. Experimental results show that the dominant frequencies of the heavy impact sounds range below 100 Hz and that they are coincident with natural frequencies of the concrete slab. In addition, simple 2-dimensional finite element models are proposed to substitute 2 types of 3-dimensional models of complicated floor structural slabs those by The analytical result shows that the natural frequencies from first to fifth mode well correspond to those by experiments with an error of less than
, and acceleration peak value iscoincident with an error of less than
. Using the finite element model. vibration levels areestimated according to the design Parameters, slab thickness, compressive strength, and as a result, the thickness is revealed as effective to increase natural frequencies by
and to reduce the vibration level by 3
4 dB per 30 mm of extra thickness.
Optimal Design of a Dynamic Absorber for the Large-size Pressure Vessel of the Petrochemical Plant
Kim, Min-Chul ; Lee, Boo-Youn ; Kim, Won-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 612~619
DOI : 10.5050/KSNVN.2005.15.5.612
In this work. two dynamic absorbers are introduced and designed to reduce the vibration of the large-size pressure vessel of a reactor for a petrochemical plant. The vibration modes and harmonic responses of the vessel are firstly analyzed by the finite element method. On the basis of the analyzed results, two dynamic absorbers are designed by a simple design theory. Furthermore, an optimization process is executed and an optimal design of the dynamic absorber is obtained to improve performance and structural safety of the vessel. As a result, the maximum displacement and stress of the vessel is decreased about
respectively, the design criteria being satisfied.
Dynamic Behavior of Rotating Cantilever Beam with Crack
Yoon, Han-Ik ; Son, In-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 5, 2005, Pages 620~628
DOI : 10.5050/KSNVN.2005.15.5.620
In this paper, we studied about the dynamic behavior of a cracked rotating cantilever beam. The influences of a rotating angular velocity, the crack depth and the crack position on the dynamic behavior of a cracked cantilever beam have been studied by the numerical method. The equation of motion is derived by using the Lagrange`s equation. The cracked cantilever beam is modeled by the Euler-Bernoulli beam theory. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. The lateral tip-displacement and the axial tip-deflection of a rotating cantilever beam is more sensitive to the rotating angular velocity than the depth and position of crack. Totally, as the crack depth is increased, the natural frequency of a rotating cantilever beam is decreased in the first and second mode of vibration. When the crack depth is constant, the natural frequencies of a rotating cantilever beam are proportional to the rotating angular velocity in the each direction.