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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
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Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 22, Issue 12 - Dec 2012
Volume 22, Issue 11 - Nov 2012
Volume 22, Issue 10 - Oct 2012
Volume 22, Issue 9 - Sep 2012
Volume 22, Issue 8 - Aug 2012
Volume 22, Issue 7 - Jul 2012
Volume 22, Issue 6 - Jun 2012
Volume 22, Issue 5 - May 2012
Volume 22, Issue 4 - Apr 2012
Volume 22, Issue 3 - Mar 2012
Volume 22, Issue 2 - Feb 2012
Volume 22, Issue 1 - Jan 2012
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Vibration and Noise Analysis for Rotary Compressor in Medium-to-high Frequency Ranges
Kwon, Hyun-Wung ; Song, Jee-Hun ; Hong, Suk-Yoon ; Hwa, Jong-Hun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1033~1041
DOI : 10.5050/KSNVE.2012.22.11.1033
Power flow analysis(PFA) is introduced for solving the noise and vibration analysis of system structures in medium-to-high frequency ranges. The vibration analysis software,
R4 based on power flow finite element method(PFFEM) and the noise prediction software,
R1 based on power flow boundary element method(PFBEM) are developed. In this paper, the coupled PFFE/PFBE method is used to investigate the vibration and radiated noise of the rotary compressor. PFFEM is employed to analyze the vibrational responses of the rotary compressor, and PFBEM is applied to analyze the radiation noise around rotary compressor. The vibrational energy of the structure is used as an acoustic intensity boundary condition of PFBEM. Numerical simulations are presented for the rotary compressor, and reliable results have been obtained.
Micro-vibration Test on a Two-axis Gimbal Antenna System with Stepping Motors
Kim, Dae-Kwan ; Yong, Ki-Lyuk ; Choi, Hong-Taek ; Park, Gee-Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1042~1048
DOI : 10.5050/KSNVE.2012.22.11.1042
A 2-axis gimbal system is one of main disturbance sources affecting image jitter response of a satellite. The gimbal system comprises azimuth stage and elevation stage, and these pointing mechanism can be rotated by stepping motors about its azimuth and elevation axes simultaneously. Because of the complex and coupled dynamic motion of the gimbal system, its moment of inertia and structural modes can be changed according to the system configuration, and thus the gimbal system generates complicated and non-linear disturbance characteristics. In order to improve the jitter response of a spacecraft, it is an indispensable process to reduce the micro-vibration disturbance level of the antenna system. In the present research, a 2-axis gimbal system was manufactured and then its micro-vibration test was performed in terms of two types of stepping motors(2-phase and 5-phase). The test results show that the disturbance level of the gimbal system can be reduced by replacing the 2-phase stepping motor with the 5-phase one, and the average disturbance attenuation ratio is 56 % in peak level and 48 % in standard deviation level. The experimental results confirm that it is an efficient jitter reduction method to adopt a high-phase stepping motor.
Characteristics of Forced Vibration of Valve-pipe Systems with a Crack
Son, In-Soo ; Kim, Chang-Ho ; Cho, Jeong-Rae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1049~1056
DOI : 10.5050/KSNVE.2012.22.11.1049
The forced vibration response characteristics of a cracked pipe conveying fluid with a concentrated mass are investigated in this paper. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by using Hamilton's principle. The effects of concentrated mass and fluid velocity on the forced vibration characteristics of a cracked pipe conveying fluid are studied. The deflection response is the mid-span deflection of a cracked pipe conveying fluid. As fluid velocity and crack depth are increased, the resonance frequency of the system is decreased. This study will contribute to the decision of optimum fluid velocity and crack detection for the valve-pipe systems.
Multibody modeling and Analysis on Difference of Pin-reaction Force and Vibration caused by Offset in Fixed Outer Ring Type Cycloidal Speed Reducer
Kim, Hong Ki ; Lee, Ki Bok ; Yoo, Hong Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1057~1063
DOI : 10.5050/KSNVE.2012.22.11.1057
A cycloid speed reducer is a type of the speed reducers. The cycloid speed reducer has a eccentric rotating motion and offset to avoid some problem of assembly, so it has a disadvantage for vibration. In this paper, a multi-body dynamic model is developed for a cycloid speed reducer and the dynamic behaviors of the reducer are investigated. The cycloid speed reducer consists of cycloidal plate gears, housing gear, input shaft, output pin and shaft, and eccentric bearings. Using a CAD program, each component of cycloid reducer is modeled based on the offset and multi-body simulations are performed using Recurdyn. As a result, the pin reaction force and the amplitude of bearing displacement are increased by the offset.
Case Study for Pitting of Elevator's Worm Gear Type Traction Machine
Seo, Sang-Yoon ; Choi, Byeong-Keun ; Yang, Bo-Suk ; Lee, Seon-Sun ; Kim, Sung-Hyeob ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1064~1070
DOI : 10.5050/KSNVE.2012.22.11.1064
This paper analyzes the pitting's cause of elevator's worm gear type traction machine. To find a cause of pitting problem, we analyzed vibration, a proper design allowance and lubrication. We brought a conclusion that the cause of pitting is not a simple vibration problem, such as misalignment of worm reducer and rail, but mostly related to a designed allowance. In this case, the allowance is tight. In general, the allowance of traction machine and lubrication is varied by manufacturers. When the allowance is tight, a proper lubrication can diminish the pitting problem.
Study on the Characteristics of a Dash System Based on Test and Simulation for Vehicle Noise Reduction
Yoo, Ji Woo ; Chae, Ki-Sang ; Cho, Jin Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1071~1077
DOI : 10.5050/KSNVE.2012.22.11.1071
Low frequency noises(up to about 200 Hz) such as booming are mainly caused by particular modes, and in general the solutions may be found based on mode controls where conventional methods such as FEM can be used. However, at higher frequencies between 0.3~1 kHz, as the number of modes rapidly increases, radiation characteristics from structures, performances of damping sheets and sound packages may be more crucial rather than particular modes, and consequently the conventional FEM may be less practical in dealing with this kinds of structure-borne problems. In this context, so-called 'mid-frequency simulation model' based on FE-SEA hybrid method is studied and validated to reduce noise in this frequency region. Energy transmission loss(i.e. air borne noise) is also studied. A dash panel component is chosen for this study, which is an important path that transmits both structure-borne and air borne energies into the cavity. Design modifications including structural modifications, attachment of damping sheets and application of different sound packages are taken into account and the corresponding noise characteristics are experimentally identified. It is found that the dash member behaves as a noise path. The damping sheet and sound packages have similar influences on both sound radiation and transmission loss. The comparison between experiments and simulations shows that this model could be used to predict the tendency of noise improvement.
Analysis of Dynamic Behavior of Floating Slab Track Using a Nonlinear Viscoelastic Spring Model
Jang, Seung Yup ; Park, Jin Chul ; Hwang, Sung Ho ; Kim, Eun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1078~1088
DOI : 10.5050/KSNVE.2012.22.11.1078
Recently, the vibration and structure-borne noise induced by passing trains are of great concerns, and the floating slab track is highlighted as one of most efficient alternatives to reduce the railway vibration. However, due to the non-linearity and viscosity of rubber spring used in the floating slab track, its dynamic behavior is very complex. In this study, therefore, to simulate the dynamic behavior of floating slab track with a better accuracy, a nonlinear viscoelastic rubber spring model that can be incorporated in commercial finite element analysis codes has been proposed. This model is composed of a combination of elastic spring element, friction element and viscous element, and termed the "generalized friction viscoelastic model(GFVM)". Also, in this study, the method to determine the model parameters of GFVM based on Berg's 5-parameter model was presented. The results of the finite element analysis with this rubber spring model exhibit very good correlation with the test results of a laboratory mock-up test, and the feasibility of GFVM has been verified.
Development of Smart Seismic Device Using FBG Sensor for Measuring Vertical Load
Chang, Sung-Jin ; Kim, Nam-Sik ; Baek, Joon-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1089~1098
DOI : 10.5050/KSNVE.2012.22.11.1089
A faulting could be occurred at the end of deck by unexpected loads to bridge bearing after a bridge completion. Serviceability of bridges could be impaired by the faulting which is caused structural damage. Therefore, smart bridge bearing which can continuously observe the supporting points is needed. Some of bridge bearings have been developed for measuring vertical load and vertical displacement by installing sensors in the bearing. In those systems, however it is not easy to be replaced with new sensors when repairs are needed. In this study, the smart bridge bearing of which sensors can be replaced has been developed to overcome such a problem. In this study, strain signals were used for measuring both of vertical displacements and loads. FBG sensors(fiber optic Bragg-grating sensors) have been used for measurement of the strain signals since it is prevented from electronic noise by mediating light, enables the simplification of the measuring cable by multiple measurement, and is easy to place by lightweight and small size. The possibility of use was reviewed for smart bridge bearing based on FBG sensors through tests.
Study on Quality Criteria for Transparent Soundproof Panels(2) - Sound Insulation Characteristics and Evaluation of Weatherability
Chang, Taesun ; Kim, Chulhwan ; Hwang, Cheolho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1099~1105
DOI : 10.5050/KSNVE.2012.22.11.1099
Transparent noise barrier panels have the advantages of transmitting light to nearby residents and allowing drivers to orientate themselves by providing views of the surrounding area. To develop guidelines on quality criteria for transparent soundproof panels, their sound transmission loss and weatherability were experimentally investigated. In Korea, the sound transmission loss of noise barrier panels should be more than 25 dB at 500 Hz and 30 dB at 1000 Hz. The transmission loss tests of transparent panels were performed in accordance with KS F 2808. Typically, plastic materials suffer from color changes when exposed to ultraviolet(UV) light over extended periods. Therefore, weathering of plastics is one of the most important properties for outdoor applications. Protection against UV radiation and weathering is usually accomplished by using UV stabilizer additives or coatings. Transparent materials for soundproof panels were examined through accelerated weathering tests and their weathering resistances were evaluated from changes in yellowness index.
Monitoring of Machining Process by Measuring Vibration of Cutting Forces
Jeon, Jae Hyeon ; Kim, Jin Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1106~1112
DOI : 10.5050/KSNVE.2012.22.11.1106
This paper deal with a technique for monitoring machining conditions by measuring the vibration of cutting forces at milling machining. The vibrations of cutting forces in milling process were measured and analyzed to be related with processing parameters. The magnitude of cutting force is linearly proportional to the feed rate and cutting depth, and frequency of cutting force is linearly proportional to the rotating speed. Wired and wireless communication methods were applied in transmitting the measured vibration signals and the two methods were compared. The magnitude of the vibration signals transmitted by the wireless communication method was similar to that transmitted by the wired communication method.
Interior Noise and Low Frequency Noise Characteristics of Busan Metro Line 3 Noise
Hong, Do-Kwan ; Jeong, Jae-Boo ; Jung, Seung-Wook ; Gang, Hyun-Wook ; Ahn, Chan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1113~1120
DOI : 10.5050/KSNVE.2012.22.11.1113
This paper deals with the analysis of interior noise and low frequency noise characteristic for the Busan citizens to use public transport, Busan Metro Line 3. The interior noise evaluation index, articulation index(AI) is evaluated the lower value about average 22 % in a whole range, this is difficult to have a conversation. Also, noise criteria(NC) curve is partially evaluated as NC-65 below 2000 Hz, space type is evaluated as factories. Another of interior noise evaluation index, preferred speech interference level(PSIL) is evaluated the upper value about average 66 dB(A) in a whole range, this is evaluated to be interrupted. In the case of low frequency noise(20~200 Hz), the measurement of low frequency noise is assessed largely beyond noise criteria of ISO 226. The low frequency noise should be reduced because low frequency noise affects on psychological stress and displeasure although low frequency noise is not recognized by auditory sense. The low frequency noise criteria and guideline will be enacted from now on in Korea.
Modeling and Vibration Control of Small-sized Magneto-rheological Damper
Lee, Jong-Woo ; Seong, Min-Sang ; Woo, Je-Kwan ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1121~1127
DOI : 10.5050/KSNVE.2012.22.11.1121
This paper presents a new small-sized damper featuring magneto-rheological(MR) fluid which can be applied to vibration control system. The proposed MR damper consists of cylinder, piston, a couple of bearings, oil-seals and magnetic circuit which has two coils. In this damper, approximately 5cc of MR fluid is used. The damping force of the MR damper is designed to be followed by linear shear-mode Bingham-plastic model. In order to verify the performance of the MR damper, an experimental apparatus is established. In the experimental test, the damping force of the MR damper is measured with respect to time, displacement and velocity. In addition, the time response of MR damper is measured when 1A of step current is applied. Finally, the proposed small MR damper is applied to vibration control. In this process, a simple 1-DOF system is modeled and controlled using PID controller.
A Mathematical Approach for Vibration Analysis of a Pickup Actuator
Lee, Kyung Taek ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1128~1136
DOI : 10.5050/KSNVE.2012.22.11.1128
This paper analyzes the vibration characteristics of an optical pickup actuator, which has six wire-suspensions and is used in optical disc drives(ODDs). The vibration characteristics of the actuator is mathematically described by analyzing its beam configuration and motion condition confined to lateral and longitudinal directions of the beams. The accuracy of the vibration characteristics is proved by comparing mode frequencies with a finite element analysis. Finally, it is shown that mode frequencies and shapes can be modified by changing design parameters in mathematical expressions.
Sound Quality Evaluation of Turn-signal of a Passenger Vehicle based on Brain Signal
Shin, Tae-Jin ; Lee, Young-Jun ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1137~1143
DOI : 10.5050/KSNVE.2012.22.11.1137
This paper presents the correlation between psychological and physiological acoustics for the automotive sound. The research purpose of this paper is to evaluate the sound quality of turn-signal sound of a passenger car based EEG signal. The previous method for the objective evaluation of sound quality is to use sound metrics based on psychological acoustics. This method uses not only psychological acoustics but also physiological acoustics. For this work, the sounds of 7 premium passenger cars are recorded and evaluated subjectively by 30 persons. The correlation between this subjective rating and sound metrics is calculated based on psychological acoustics. Finally the correlation between the subjective rating and the EEG signal measured on the brain is also calculated. Throughout these results the new evaluation system for the sound quality on interior sound of a passenger car has been developed based on bio-signal.
Prediction of the Damage in the Structure with Damping Using the Modified Dynamic Characteristics
Lee, Jung Youn ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 11, 2012, Pages 1144~1151
DOI : 10.5050/KSNVE.2012.22.11.1144
A damage in structure alters its dynamic characteristics. The change is characterized by changes in the modal parameter, i.e., modal frequencies, modal damping value and mode shape associated with each modal frequency. Changes also occur in some of the structural parameters; namely, the mass, damping, stiffness matrices of the structure. In this paper, evaluation of changes in stiffness matrix of a structure is presented as a method not only for identifying the presence of the damage but also locating the damage. It is shown that changed stiffness matrix can be accurately estimated a sensitivity coefficient matrix derived from modifying mode shapes, First, with 4 story shear structure models, the effect of presence of damage in a structure on its stiffness matrix is studied. By using these analytical model, the effectiveness of using change of stiffness matrix in detecting and locating damages is demonstrated. To validate the predicted changing stiffness and its location, the obtained results are compared to the reanalysis result which shows good agreement.