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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 19, Issue 12 - Dec 2009
Volume 19, Issue 11 - Nov 2009
Volume 19, Issue 10 - Oct 2009
Volume 19, Issue 9 - Sep 2009
Volume 19, Issue 8 - Aug 2009
Volume 19, Issue 7 - Jul 2009
Volume 19, Issue 6 - Jun 2009
Volume 19, Issue 5 - May 2009
Volume 19, Issue 4 - Apr 2009
Volume 19, Issue 3 - Mar 2009
Volume 19, Issue 2 - Feb 2009
Volume 19, Issue 1 - Jan 2009
Selecting the target year
Noise Analysis of Discharge Valve in a Linear Compressor Considering Fluid-valve-piston Interactions
Lee, Jun-Ho ; Jeong, Weui-Bong ; Han, Hyung-Suk ; Lee, Hyo-Jae ; Jeong, Sang-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1237~1243
DOI : 10.5050/KSNVN.2009.19.12.1237
A computational procedure to estimate the noise radiated from a discharge valve system in a linear compressor was discussed and established. This procedure was composed of three steps. As the first step, the dynamic behavior of the valve system was estimated taking into consideration of fluid-valve-piston interactions. As the second step, the flow characteristics of refrigerant in the discharge valve system were estimated through computational fluid dynamics applying the behaviors of the valves as moving boundary conditions. The variations of pressures and velocities of fluid were converted to quadrupole noise sources. As the final step, the boundary element method based on Helmholtz equation was applied to predict the radiated acoustic pressure. The computational results by the presented procedure were experimentally validated.
Modal Analysis of a Rotating Packet Blade System having a Crack
Kwon, Seung-Min ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1244~1251
DOI : 10.5050/KSNVN.2009.19.12.1244
In this paper the vibrational behavior of a multi-packet blade system having a cracked blade is investigated. Each blade is assumed as a slender cantilever beam. The coupling stiffness effect that originates from either disc flexibility or shroud is considered in the modeling. Hybrid deformation variables are employed to derive the equations of motion. The flexibility due to crack, which is assumed to be open during the vibration, is calculated basing on a fracture mechanics theory. In the paper, the results of the change in modal parameters due to crack appearance are presented. The influence of the crack parameters, especially of the changing location of the crack is examined.
Condition Monitoring for Coil Break Using Features of Stationary Rolling Region
Oh, J.S. ; Yang, S.W. ; Shim, M.C. ; Caesarendra, W. ; Yang, B.S. ; Lee, W.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1252~1259
DOI : 10.5050/KSNVN.2009.19.12.1252
Due to the international competition and global pressure, the roll speed is increased. However, higher speeds increase the power density in the process as well as the plant's potential to react with vibrations. Under certain operating conditions, vibrations may occur, which again cause chattermarks, strip rupture or coil break fault. The appropriate condition monitoring is needed to improve product quality and availability. The aim of condition monitoring is to reduce maintenance costs, increase productivity and improve product quality. This paper proposes a condition monitoring tool designed for the classification of coil break fault. This method is used to cold rolling mill for faults monitoring based on vibration and motor current signals. The results show that the performance of classification has high accuracy based on experimental work.
Comparison of Measurement Methods for Head-related Transfer Function(HRTF)
Ahn, Tae-Soo ; Lee, Doo-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1260~1268
DOI : 10.5050/KSNVN.2009.19.12.1260
Three methods(the stepped sine method, the statistical method(random excitation method) and the maximum-length sequence(MLS) method) for head-related transfer functions(HRTFs) are experimentally compared in view point of accuracy and efficiency. First, the stepped sine method has high signal-to-noise ratio, but low efficiency. Second, the statistical method is fast measurement speed, but weak to noise than the other methods. Finally, the MLS method shows both good efficiency and high signal-to-noise ratio, but it needs additional software or equipment such as MLS signal generator. For comparison of measurement accuracy, HRTFs of KEMAR dummy are measured for various azimuths and elevations. Error norms for magnitude and phase of HRTFs are defined and calculated for the measured HRTFs. The calculated error norms show that the methods give similar results in magnitude and phase except a little phase difference in the MLS method.
Measurement and Evaluation of the Acoustic Performance in the Royal Palace Buildings of Joseon Dynasty - Focused on Pyeonjeon and Chimjeon -
Kim, Nam-Wook ; Kim, Myung-Jun ; Han, Wook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1269~1280
DOI : 10.5050/KSNVN.2009.19.12.1269
This study was performed to construct sound performance DB of royal palace buildings and to examine the special quality more scientifically. Research target of royal palace were Changdeokgung and Gyeongbokgung. Sound insulation performance between the adjacent room and facade, room acoustics of Pyeonjeon and Chimjeon which is representative building in royal palace were examined through field measurement. Measured values of RT(
) at Pyeonjeon were 0.78 sec. and 1.03 sec. in Seonjeongjoen and Sajeongjoen, respectively. The RTs of both Pyeonjeon buildings were estimated suitable for speech and lecture considering their volume. The RT(
)s at Chimjeon were measured in range of 0.29~0.55 sec. This meant that the acoustic energy in rooms was decreased by sound transmission through mulberry paper(Hanji) of traditional windows and doors. As a sound insulation performance, the single-number quantities(
) of the building facades in Pyeonjeon and Chimjeon were measured 4~20 dB. Also the single-number quantities(
) between the adjacent rooms in Chimjeon were measured 3~18 dB. Sound insulation performance of traditional building elements such as window and door depended strongly on their layers and area.
Variation of Dynamic Characteristics of a Low Pressure Turbine Blade with Crack Length
Yang, Kyeong-Hyeon ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1281~1288
DOI : 10.5050/KSNVN.2009.19.12.1281
Variation of dynamic characteristics of a low pressure turbine blade with crack length is studied in this paper via both experiments and finite element model. Since most of the turbine blades used in domestic power plants are imported from abroad, it is necessary to understand their dynamic behavior in advance. When experimentally obtained natural frequencies and mode shapes are compared with those from FEM results, they are close to each other in their magnitude. Then, it is more feasible to use finite element model for analyzing the dynamic characteristics of a blade under various operation conditions (rotation speed, temperature, etc) as well as with a crack in the blade.
Design and Analysis of Ultrasonic Vibrator for Conformal Coating in LED Packaging
Son, Byeoun-Ho ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1289~1295
DOI : 10.5050/KSNVN.2009.19.12.1289
This paper presents design and analysis of ultrasonic vibrator featuring the piezoelectric actuator. After describing a geometric configuration of the proposed vibrator, an analytical model of the ultrasonic vibrator is formulated by adopting liquid film pattern theory and wave theory. The dynamic analysis and geometric optimization are then undertaken using a software ANSYS. The optimization is performed by taking the amplitude of the tip displacement as an objective function. The fluid flow characteristics of the proposed vibrator are analyzed by taking three different fluids: water, silicon oil and ethylene-glycol. This is achieved using a software FLUENT.
Dynamic Stability Analysis of Stiffened Tapered Thick Plate with Concentrated Mass on Pasternak Foundations
Lee, Yong-Soo ; Kim, Il-Jung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1296~1305
DOI : 10.5050/KSNVN.2009.19.12.1296
This paper has the object of investigating dynamic stability of stiffened tapered thick plate with concentrated mass on Pasternak foundation by means of finite element method and providing kinematic design data for mat of building structures. Finite element analysis of stiffened tapered thick plate is done by use of rectangular finite element with 8-nodes. In order to analysis plate which is supported on Pasternak foundation, the Winkler foundation parameter is varied with 10, 100, 1000 and the shear foundation parameter is 5, 10, concentrated mass is
, tapered ratio is 0.25, 0.5. The ratio of In-plane force to critical load is applied as
respectively. This paper analyzed varying tapered ratio.
Dynamic Responses Characteristics of Steel Box Railway Bridges Subjected to Train Loading
Park, Sun-Joon ; Kang, Sung-Hoo ; Jo, Eun-Pyung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1306~1314
DOI : 10.5050/KSNVN.2009.19.12.1306
By rising the interests of the railroad, It has been required the research about railroad structure. And since 2000, the study about railway bridges caused by steel box railway bridges has been only 0.2 %. So I was hard to find out about steel box railway bridges. In this study, I evaluate and analyze 4 types(KTX, Saemaeul, Mugunghwa, Freight) of dynamic caused by train loading, natural frequency and damping ratio, verticality deflection and verticality acceleration, end slope deflection, impact factor for dynamic characteristics analysis. natural frequency was measured 2.45 Hz~3.34 Hz and damping ratio revealed for 1.26~2.84 %. Maximum verticality deflection(4.86 mm) was sufficiently satisfied the design criteria(30.1 mm), but in the case of verticality acceleration's respond, design criteria BRDM(bridge design manual) & CTRL presentation derive rail limit value 0.35 g be more than value 6 time recorded, maximum was measured 0.49 g in 3 kinds of train(KTX, Saemaeul, Mugunghwa), except for Freight. Survey impact factor of Experiment bridge was 0.20 which is measured when the KTX(15:04) was driving. impact factor is enough contended with design criteria 0.29 which is presented in domestic railway design criteria and thoroughly guarantee the dynamic stability.
Evaluation of Vibration Control Performance of Camera Mount System for UAV
Oh, Jong-Suk ; Sohn, Jung-Woo ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1315~1321
DOI : 10.5050/KSNVN.2009.19.12.1315
In the present work, vibration control performance of active camera mount system for unmanned aero vehicle(UAV) is evaluated. An active mount featuring inertia type of piezostack actuator is designed and manufactured. Then, vibration control performances are experimentally evaluated. A camera mount system with four active mounts is constructed and mechanical model is established. The governing equation for the camera mount system is obtained and control model is constructed in state space model. Sliding mode controller which has inherent robustness to external disturbance is designed and implemented to the system. Vibration control performances are evaluated at each mount and center of gravity point. Effective vibration performances are obtained and presented in time and frequency domains.
Vibration Analysis of PCB Manufacturing System Using Maskless Exposure Method
Jang, Won-Hyuk ; Lee, Jae-Mun ; Cho, Myeong-Woo ; Kim, Joung-Su ; Lee, Chul-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1322~1328
DOI : 10.5050/KSNVN.2009.19.12.1322
This paper presents vibration analysis of maskless exposure module in printed circuit board(PCB) manufacturing system. In order to complete exposure process in PCB, masking type module has been widely used in electronics industries. However, masking process confronts some limitations of application due to higher production cost for masking as well as lower printing resolution. Therefore, maskless exposure module is started to be in the spotlight for flexible production system to meet the needs of fabrication in variable patterns at low cost. Since maskless exposure process adopts direct patterning to PCB, vibration problems become more critical compared to conventional masking type process. Moreover, movements of exposure engine as well as stage generate vibration sources in the system. Thus, it is imperative to analyze the vibration characteristics for the maskless exposure module to improve the quality and accuracy of PCB. In this study, vibration analysis using the finite element analysis is conducted to identify the critical structural parts deteriorating vibration performance. Also, Experimental investigations are conducted by single/dual encoder measurement process under the operating module speed. Measurement points of vibration are selected by three places, which are base of stage, exposure engine and top of stage, to check the effect of vibration from the exposure engine. Comparisons between analysis results and experimental measurement are conducted to confirm the accuracy of analysis results including the developed FE model. Finally, this studies show feasibility of optimal design using the developed FE analysis model.
Analysis of Reducing Tonal Noise of the Gas Turbine Generator in order to Reduce Underwater Radiated Noise of a Naval Vessel
Han, Hyung-Suk ; Choi, Ki-Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1329~1337
DOI : 10.5050/KSNVN.2009.19.12.1329
Because the tonal sound of the underwater noise in a naval vessel can be identified from the sub-marine of the enemy, it should be reduced sufficiently. This kind of the noise usually comes from the structure-borne noise of the onboard machine and transfers to the sea through the hull of the ship. The vibration at the high frequency can be reduced sufficiently with damping material. In this paper, the damping coefficient of the steel plate with damping sheet is evaluated by experiment. Using these evaluated properties, the numerical analysis is performed in order to evaluate how much vibration of the generator can be reduced applying damping sheet on the encloser and base of it.
A One-dimensional Annular Plate Element for In-plane Vibration Analysis of Full Disks
Kwak, Dong-Hee ; Lim, Jung-Ki ; Kim, Chang-Boo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1338~1346
DOI : 10.5050/KSNVN.2009.19.12.1338
We present a one-dimensional annular plate element with which the in-plane vibration of full disks can be analyzed efficiently and accurately by using the FEM. Its elementary mass matrix and stiffness matrix are derived, respectively, from the virtual work by effective forces and the virtual strain energy. The static deformation modes obtained from an integration of the differential equilibrium equations of the annular plate are used as interpolation functions of the one-dimensional annular plate element. The in-plane natural vibration characteristics of a 2-step full disk and a uniform full disk are analysed. Its results are compared with the results obtained by utilizing two-dimensional 8-node quadrilateral plane elements and cyclic symmetry of the disk. And also, by comparing with the theoretical results of previous researchers, the efficiency and accuracy of the presented element are verified.
Experimental Verification of Spectral Element Analysis for the High-frequency Dynamic Responses of a Beam with a Surface Bonded Piezoelectric Transducer
Kim, Eun-Jin ; Sohn, Hoon ; Park, Hyun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1347~1355
DOI : 10.5050/KSNVN.2009.19.12.1347
This paper demonstrates the validity of spectral element analysis for modeling the high-frequency dynamic behaviors of a beam with a surface-bonded piezoelectric wafer through a laboratory test. In the spectral element analysis, the high-frequency electro-mechanical interaction can be considered properly with relatively low computational cost compared to the finite element analysis. In the verification test, a cantilever beam with a surface-bonded piezoelectric wafer is forced to be in steady-state motion by exerting the harmonic driving voltage signal on the piezoelectric wafer. A laser scanning vibrometer is used to obtain the overall dynamic responses of the structure such as resonance frequencies, the associated mode shapes, and frequency response functions up to 20 kHz. Then, these dynamic responses from the test are compared to those computed by the spectral element analysis. A two-dimensional finite analysis is conducted to obtain the asymptotic solutions for the comparison purpose as well.
Study on Topology Optimization for Eigenfrequency of Plates with Composite Materials
Kim, Hwa-Ill ; Yun, Hyug-Gee ; Han, Kyong-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 12, 2009, Pages 1356~1363
DOI : 10.5050/KSNVN.2009.19.12.1356
The aim of this research is to construct eigenfrequency optimization codes for plates with Arbitrary Rank Microstructures. From among noise factors, resonance sound is main reason for floor's solid noise. But, Resonance-elusion design codes are not fixed so far. Besides, The prediction of composite material's capability and an resonance elusion by controlling natural frequency of plate depend on designer's experiences. In this paper, First, using computer program with arbitrary rank microstructure, variation on composite material properties is studied, and then natural frequency control is performed by plate topology optimization method. The results of this study are as followed. 1) Programs that calculate material properties along it's microstructure composition and control natural frequency on composite material plate are coded by Homogenization and Topology Optimization method. and it is examined by example problem. 2) Equivalent material properties, calculated by program, are examined for natural frequency. In this paper, Suggested programs are coded using
, Feapmax and Feap Library with Homogenization and Topology Optimization method. and Adequacy of them is reviewed by performing the maximization or minimization of natural frequency for plates with isotropic or anisotropic materials. Since the programs has been designed for widely use. If the mechanism between composite material and other structural member is identified, extension application may be possible in field of structure maintenance, reinforcement etc. through application of composite material.