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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 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
A Study on the Computation and Application of Sound Power Level for Road Traffic Noise of Renewal Area
Kim, Deuk-Sung ; Chang, Seo Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 635~644
DOI : 10.5050/KSNVN.2005.15.6.635
This paper is. a study on relation between road traffic noise(RTN) and sound power level(PWL). At present, many experimental formulae and prediction formulae are used for prediction of RTN. But these formulae are difficult to appiy to the metropolitan area because these formulae are inaccurate in the different condition from reference condition. This paper calculate RTN and PWL of each prediction formula, choose the best one and make a noise map of the subject area. Procedure is as follows. First, calculate
of RTN using experimental formulae and prediction formulae. Second, calculate PWL using
of RTN and distance attenuation for point source at semi-free field. Third, choose the most accurate formula. And finally, make a noise map of the subject area at present and future. The result using noise map will be able to apply to application field. Noise mapping tool used on this paper is Raynoise program using Ray Tracing Method(RTM), Mirror Image Source Method(MISM) and Hybrid Method(HM).
Characteristics of Construction Machinery Noise and Vibration
Kang, Daejoon ; Lee, W.S. ; Lee, J.W. ; Hong, J.K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 645~651
DOI : 10.5050/KSNVN.2005.15.6.645
The construction noise Is one of the main causes of environmental impact. The complaints about it have been increasing every year. In order to reduce construction machinery noise, the product noise labeling for construction machinery has been recommended since 1 February 1996 and In the near future the government will convert the recommended product noise labeling to the mandatory product noise labeling for high noise construction machinery. Therefore, we investigated the noise and vibration level of 302 construction machines in construction work sites. This paper presents the basic data that will be used for setting the standard of construction machinery noise and predicting the noise level near construction work sites in environmental Impact assessment.
Seismic Analysis on a Control Panel of (Nuclear) Power Plant
Lee, Heung-Shik ; Kim, Myung-Gu ; Cho, Chongdu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 652~659
DOI : 10.5050/KSNVN.2005.15.6.652
In this paper, seismic qualification analysis for the Plant control Panel is carried out to confirm the structural integrity under the seismic conditions represented by required response spectra(RRS). The finite element method(FEM) is used for the analysis and a mode combination method is adopted to obtain a more reliable spectrum analysis results. In addition, the experimental analysis is performed to compare the reliability of the analytical results. The analysis results shows that the plant control panel system is designed to have the dynamic rigidity with no resonance frequency below 33 Hz. The analytically calculated maximum stress of the plant control panel system is
of the field strength of material, thus it can be shown that the system has a stable structure for the seismic load.
Design of Swing Arm Type`s Actuator for Small-sized ODD
Oh, Jeseung ; Park, Se-June ; Lee, Dong-Ju ; Jung, Ho-Seop ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 660~666
DOI : 10.5050/KSNVN.2005.15.6.660
Recently, the need for subminiature storage systems has increased with the diversification of portable devices. An actuator for small optical disk drives has to satisfy performance requirements such as higher access speed, lower power consumption, and smaller size. In this paper, we proposed the miniaturized rotary type VCM actuator that had an effective focusing mechanism and secured sufficient bandwidth for small form factor (SFF) optical disk drive (ODD). Initial model was designed by electromagnetic (EM) and structural analyses. Such a model was improved using design of experiments (DOE) procedure based on a Blu-ray disk (BD) 1x specifications.
A Flexure Guided Planar Scanner for Scanning Probe Microscope ; Part 1 : Design and Analysis of Static and Dynamic Properties
Lee, Dong-Yeon ; Lee, Moo-Yeon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 667~673
DOI : 10.5050/KSNVN.2005.15.6.667
This paper shows a method for design of the nano-positioning planar scanner used in the scanning probe microscope. The planar scanner is composed of flexure guides, piezoelectric actuators and feedback sensors. In the design of flexure guides, the Castigliano`s theorem was used to find the stiffness of the guide. The motion amplifying mechanism was used in the piezoelectric actuator to achieve a large travel range. We found theoretically the travel range of the total system and verified using the commercial FEM(finite element method) program. The maximum travel range of the planar scanner is above than 140
m. The 3 axis positioning capability was verified by the mode analysis using the FEM program.
Analysis of Vehicle Vibration Characteristics Using SEA
Chai, Jangbom ; Kim, Taekwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 674~679
DOI : 10.5050/KSNVN.2005.15.6.674
Statistical Energy Analysis(SEA) has been considered as a Possible method for predicting responses of complex structures, especially at higher frequencies. In this paper, an SEA model of a vehicle was built using 138 energy storing subsystems connected together using 1019 Junctions. SEAM software program was used to build and calculate the model. To demonstrate the accuracy of the SEA model, predicted response levels were compared with measured levels. The source Input levels were measured at the engine mounting parts. There is good agreement between the estimated and the experimental results. This paper also identifies some dominant energy flow paths from sources. It is finally presented that the SEA model can optimize the design parameters of vehicles using model parameters and energy flow paths.
Study on the Robust Design of an Intake System Using a Frequency Weighting Function
Lee, J.K. ; Park, Y.W. ; Chai, J.B. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 680~686
DOI : 10.5050/KSNVN.2005.15.6.680
This paper introduces the robust design of an intake system using transmission loss and the frequency weighting function. First, transmission loss is measured to evaluate the performance of the noise reduction for the intake system. The robust design parameters of the intake system are extracted by adapting a cost function with the Taguchi method. Subsequently, the frequency weighting function is developed by the subjective evaluation in which 6 special engineers were participated. Finally, the comparison between the proposed frequency weighted optimal design and unweighted optimal design for the transmission loss as the part is performed. Here, the overall levels of the transmission loss according to the methods are presented to validate the effectiveness of the proposed methodology.
Computation of Broadband Noise of a 2-B Flat-airfoil Cascade Subject to Ingested Turbulence
Cheong, Cheolung ; Joseph Phillip ; Lee, Soogab ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 687~696
DOI : 10.5050/KSNVN.2005.15.6.687
Acoustic power spectrum of the upstream and downstream sound field due to an isotropic frozen turbulent gust impinging on a cascade of flat plate airfoils are computed by using a analytic formulation derived from Smith`s method, and Whitehead`s LINSUB codes. A parametric study of the effects on sound power of the number of blades and turbulence length scale is performed with an emphasis on analyzing the characteristics of sound power spectrum. Through the comparison of the computed results of sound power, it is found that acoustic power spectrum from the 2-D cascade subject to a ingested turbulence can be categorized into two distinct regions. one is lower frequency region where some spectral components of turbulence do not contribute to the cut-on acoustic modes and therefore the effect of the cascade geometry is more dominant ; the other is higher frequency region where all of spectral components of turbulence make contributions to cut-on acoustic modes and thus acoustic power is approximately proportional to the blade number.
Structural Damage Detection for Metal Panel Using Embedded Sensitivity Functions
Yang, Chul-Ho ; Adams, Douglas E. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 697~705
DOI : 10.5050/KSNVN.2005.15.6.697
Vibration-based damage identification method using embedded sensitivity functions is discussed. The theory of embedded sensitivity functions is reviewed and applied to identify damage in a three degree-of-freedom system and a metallic panel. Embedded sensitivity functions are algebraic combinations of measured frequency response functions that reflect changes in the response of mechanical systems when mass, damping or stiffness parameters are changed. By comparing the embedded sensitivity functions with finite difference functions using undamaged and damaged frequency response functions, damage is shown to be properly detected, located and quantified in theory and practice assuming that structures of interest are only damaged in one location. Simulated and experimental results indicate that the technique is most effective when changes to frequency response functions are small to avoid distorsions in the estimated perturbations due to variations in the sensitivity functions.
Nonlinear Torsional Oscillations of a System Incorporating a Hooke`s Joint : Combination Resonances
Chang, Seo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 706~711
DOI : 10.5050/KSNVN.2005.15.6.706
Torsional oscillations of a system incorporating a Hooke`s joint are investigated by studying a simple similar nonlinear 2-degree-of-freedom model, which has linear and quadratic nonlinear parametric excitations. The simple system is identified to have the possibilities of primary, sub harmonic and combination resonances. The case of simultaneous primary and combination resonances is selected for perturbation analysis to have the reduced amplitude-equations of motion. The same procedure is applied to the system incorporating a Hooke`s joint.
System Identification of MIMO Systems Considering Analytically Determined Information
Kim, Saang-Bum ; Spencer B. F., Jr. ; Yun, Chung-Bang ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 712~717
DOI : 10.5050/KSNVN.2005.15.6.712
This paper presents a system identification method for multi-input, multi-output (MIMO) systems, by which a rational polynomial transfer function model is identified from experimentally determined frequency response function data. Analytically determined information is incorporated in this method to obtain a more reliable model, even in the frequency range where the excitation energy is limited. To verify the suggested method, shaking table test for an actively controlled two-story, bench-scale building employing an active mass damper is conducted. The results show that the proposed method is quite effective and robust for system identification of MIMO systems.
Factor Analysis of the Aircraft Noise Impact Assessment in the Building Site Development District Around of Gimpo Airport
Kim, Heung-Sik ; Ju, Si-Woong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 718~723
DOI : 10.5050/KSNVN.2005.15.6.718
The purpose of this study is to present a fundamental data for evaluating aircraft noise of building site development. By the field experiments and the predicted equal noise level contours using the INM program, actual condition in the building site development arranged district was investigated. In order to get the results, Analysis of factors effected on noise level, sound level on the rate of increase to aircraft demand and difference on the aircraft noise levels according to floor level in apartment house was carried out. As a result the influence of the take-off and landing direction were appeared greatly. The influences of the height at receiving point, movement number of aircraft and increase to aircraft demand were appeared small And the influence of 1 day average WECPNL must be considered.
The Korean`s Sound Recognition Impressed in Ancient Sijo
Lee, Tai-gang ; Jang, Gil-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 724~730
DOI : 10.5050/KSNVN.2005.15.6.724
Literary works contain various human emotion and historical, cultural background. It is very significant to understand sound recognition and receptions represented in many literary works. This study aims to investigate the sound impression on ancient Korean Sijo( Korean Verse) involved various traditional korean emotion, which were expressed in different situations. Firstly we selected the appropriate Sijo to express sounds, and then classified the sound, analyzed the meaning of recognition to the sound. The number of 297 sounds were classified into 13 categories, and 20 emotional meanings. Especially, `internal sadness` characterized the korean rooted emotion were more expressed than other meanings and this meaning were symbolized by the sound of wild geese and cuckoos.
The Effects of Torsional Characteristics according to Mounting Method of the Frame of a Large-sized Truck on Dynamic Performance
Moon, Il-Dong ; Kim, Byoung-Sam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 731~737
DOI : 10.5050/KSNVN.2005.15.6.731
This paper evaluates dynamic performance of a cab over type large-sized truck for estimating the effects of frame`s torsional characteristics using a computer model. The computer model considers two mounting methods of frame, flange mounting and web mounting. Frame is modeled by finite elements using MSC/NASTRAN In order to consider the flexibility of frame. The torsional test of the frame is conducted In order to validate the modeled finite element model. A load cell is used to measure the load applied to the frame. An angle sensor is used to measure the torsional angle. An actuator is used to apply a load to the frame. To estimate the effects of frame`s torsional characteristics on dynamic performance, simulations are performed with the flange mounting and web mounting frame. Simulation results show that the web mounting frame`s variations of roll angle, lateral acceleration, and yaw rate are larger than the flange mounting frame`s variations, especially in the high velocity and the second part of the double lane course.
Ship Radiated Noise Measurement Methods and Accuracy Analysis
Lee, Phil-Ho ; Yoon, Jong-Rak ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 738~748
DOI : 10.5050/KSNVN.2005.15.6.738
The ship radiated noise level fluctuates by the difference of interference and reverberation according to measurement methods and environmental conditions. These phenomena cause error of the source level estimation even in the same environment conditions. This paper describes a quantitative analysis and a reduction method for an error value to the source level estimation in spatial and temporal interference environment. The design criteria of the radiated noise measurement array composed of omni-directional hydrophones and the source level accuracy in the deep water range are given. The source level accuracy in the shallow water range is also derived based on the statistical model of the multiple reflection paths. The results are verified using the water tank experiment and the sea trial.
Vibration Analyses of HDD Spindle Systems Supported by Hydrodynamic Bearings Taking into Account Stator`s Flexibility
Lim, Seungchul ; Chun, Sang-Bok ; Han, Yun-Sik ; Lee, Ho-Seong ; Kim, Cheol-Soon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 749~756
DOI : 10.5050/KSNVN.2005.15.6.749
This paper presents vibration analyses of hard disk drive (HDD) spindle systems based on the finite element method. The systems under investigation have a cantilevered shaft rotating on hydrodynamic bearings. In particular, the influence of stator`s flexibility on major modes has been taken into account in dual ways lumped and distributed-parameter model approfches. Even the latter employs relatively macroscopic elements instead of extremely fine ones Popular in commercial codes. In order to prove the effectiveness of such formulated models, two types of HDD prototypes featuring different hub and stator structures are selected as examples. Compared to the first, the second type has a reinforced stator that would raise the natural frequency of the hub`s translational (or sideway) mode. Both free and forced vibration characteristics are computed, and subsequently compared with the experimental data. It is our conclusion that Particularly the Proposed distributed model method is an efficient design tool for state-of-the-art HDD spindle systems.
Model Following Dual Controller Design For Random Vibrating System Using a Stochastic Controller Technique
Lee, J.B. ; Kim, H.Y. ; Ahn, J.Y. ; Heo, H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 757~763
DOI : 10.5050/KSNVN.2005.15.6.757
Much of the study has been done on the design of dual controller that guarantee the stability and improvement of the system performance. A dual controller concept is proposed to consist of first controller estimates the control law and second controller suppresses the combined noises due to numerical error and internal noise as well. These Irregular disturbances are not only increasing the fatigue but also destabilize the system because of unwanted output Performance. The `stochastic controller` is used to suppress the irregular random disturbance. Simulation is conducted to reveal that the proposed dual stochastic controller is highly efficient one to control a system hybrid noises.
An Experimental Study of the Transmissibility of Vehicle Compact Disk Player
Lee, Tae-Keun ; Kim, Byoung-Sam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 6, 2005, Pages 764~771
DOI : 10.5050/KSNVN.2005.15.6.764
This study investigates the 3-axis transmissibility of the vehicle compact disk player`s mainbase which is supported by dampers and springs. These dampers and springs as the important element ` determining the vibration performance of vehicle compact disk Player are used to minimize the vibration which is induced by driving the vehicle. In order to determine the analysis frequency band, we investigated the excitation frequency of road from the vehicle test. As the characteristics of damper and spring were changed, we carried out the vibration test and investigated the change of transmissibility, Also, we carried out the sensitivity analysis for transmissibility and we found out that the properties of damper were the dominant element in the vibration performance of vehicle compact disk player.