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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 21, Issue 12 - Dec 2011
Volume 21, Issue 11 - Nov 2011
Volume 21, Issue 10 - Oct 2011
Volume 21, Issue 9 - Sep 2011
Volume 21, Issue 8 - Aug 2011
Volume 21, Issue 7 - Jul 2011
Volume 21, Issue 6 - Jun 2011
Volume 21, Issue 5 - May 2011
Volume 21, Issue 4 - Apr 2011
Volume 21, Issue 3 - Mar 2011
Volume 21, Issue 2 - Feb 2011
Volume 21, Issue 1 - Jan 2011
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Active Noise Control of a Closed Rectangular Cavity Using FXLMS Algorithms
Ryu, Kyung-Wan ; Hong, Chin-Suk ; Shin, Chang-Joo ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 983~990
DOI : 10.5050/KSNVE.2011.21.11.983
This paper investigates active noise control(ANC) of a rectangular cavity using single channel filtered-x least mean square(FXLMS) algorithms to globally reduce the interior noise. To obtain the global reduction of the interior noise, multichannel active control should be incorporated in general. We, however, examined firstly the optimal location of the secondary source that produces a global reduction of the interior noise field using single channel control. We then investigated the frequency characteristics of the reduction to yield the effective frequency band of the active control system. It follows that the secondary source should be located as close to the primary source as possible in order to obtain the global reduction.
An Experimental Study on the Vibration Absorber for Vibration Attenuation of Cantilever Beam Structure
Kwag, Dong-Gi ; Bae, Jae-Sung ; Hwang, Jai-Hyuk ; Kim, Hun-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 991~996
DOI : 10.5050/KSNVE.2011.21.11.991
This study was carried out vibration attenuation of vibration absorber attached to the cantilever beam structure. Modern tank guns are stabilized to allow fire on the move while traversing uneven terrain. However, as the length of the barrel is extended, to meet required muzzle exit velocities, the terrain induced vibrations lead to increased muzzle pointing errors. Thus, reducing these vibrations should lead to increased accuracy. The vibration absorber includes a compliant energy storage device, such as a spring, and a mass secured to the energy storage device. In this study, it accomplished a research in about gun barrel vibration attenuation using tuned mass damper. The barrel was hung from a bungee cord for free-free condition. It accomplished a vibration experiment for verified attenuation efficiency.
Fault Detection Algorithm of Charge-discharge System of Hybrid Electric Vehicle Using SVDD
Na, Sang-Gun ; Yang, In-Beom ; Heo, Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 997~1004
DOI : 10.5050/KSNVE.2011.21.11.997
A fault detection algorithm of a charge and discharge system to ensure the safe use of hybrid electric vehicle is proposed in this paper. This algorithm can be used as a complementary way to existing fault detection technique for a charge and discharge system. The proposed algorithm uses a SVDD technique, which additionally utilizes two methods for learning a large amount of data; one is to incrementally learn a large amount of data, the other one is to remove the data that does not affect the next learning using a new data reduction technique. Removal of data is selected by using lines connecting support vectors. In the proposed method, the data processing speed is drastically improved and the storage space used is remarkably reduced than the conventional methods using the SVDD technique only. A battery data and speed data of a commercial hybrid electrical vehicle are utilized in this study. A fault boundary is produced via SVDD techniques using the input and output in normal operation of the system without using mathematical modeling. A fault detection simulation is performed using both an artificial fault data and the obtained fault boundary via SVDD techniques. In the fault detection simulation, fault detection time via proposed algorithm is compared with that of the peak-peak method. Also the proposed algorithm is revealed to detect fault in the region where conventional peak-peak method is never able to do.
Evaluation and Effect Area of Hitting Noise Occurring at a Golf Driving Range
Lee, Jong-Bae ; Kim, Jae-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1005~1012
DOI : 10.5050/KSNVE.2011.21.11.1005
Diverse sports are appearing due to the enhanced quality of life and improved cultural standards of the present society. In particular, as golf gains greater popularity from the public, many golf ranges are being constructed near residential areas. However, the hitting noise generated by golf disrupt the pleasant living environment of neighboring residents to generate strong disputes related with noise. In this perspective, this study analyzed the characteristics and dispersion of sound pressure level according to the frequency of hitting noises generated in golf driving ranges and used this data to predict the range of effect through computer simulation. Thus, it is stipulated that these research results can be used as useful data for establishing effective plans in the future during civil complaints reported in relation to hitting noises in golf driving ranges.
Sound Attenuation by Cylinders Arranged in a Lattice
Kim, Hyun-Sil ; Kim, Sang-Ryul ; Kim, Jae-Seung ; Kim, Bong-Ki ; Lee, Seong-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1013~1019
DOI : 10.5050/KSNVE.2011.21.11.1013
Sound attenuation of periodically arranged cylindrical rods is studied numerically and experimentally. Cross section of the cylinder is circular and arrays are in a square lattice. Cylinders are made of steel, and consist of five groups with different diameters from 27.2 mm to 48 mm. Each group has 5 rows, while number of cylinders in a row varies from 17 to 31. The area filling fraction is about 60~61 %, which leads to the stop bandgap(2.9 kHz ~ 8.4 kHz). Sound attenuation is computed using two-dimensional BEM, and measurement is done by using a speaker and microphones in a semi-anechoic room. Comparison of the results by BEM and experiment shows that attenuation spectra are qualitatively in agreement, although experiment gives higher attenuations than BEM. After results by BEM are scaled up in accordance with cylinder diameter, it is observed that attenuation curves are in good agreement, which confirms that analysis by BEM is done correctly. It is also found that the measured bandgaps are shifted toward lower frequency by 0.5 kHz ~ 1.2 kHz, when compared to the predictions obtained from infinitely repeated two-dimensional cylinder arrays.
Neural-network-based Fault Detection and Diagnosis Method Using EIV(errors-in variables)
Han, Hyung-Seob ; Cho, Sang-Jin ; Chong, Ui-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1020~1028
DOI : 10.5050/KSNVE.2011.21.11.1020
As rotating machines play an important role in industrial applications such as aeronautical, naval and automotive industries, many researchers have developed various condition monitoring system and fault diagnosis system by applying artificial neural network. Since using obtained signals without preprocessing as inputs of neural network can decrease performance of fault classification, it is very important to extract significant features of captured signals and to apply suitable features into diagnosis system according to the kinds of obtained signals. Therefore, this paper proposes a neural-network-based fault diagnosis system using AR coefficients as feature vectors by LPC(linear predictive coding) and EIV(errors-in variables) analysis. We extracted feature vectors from sound, vibration and current faulty signals and evaluated the suitability of feature vectors depending on the classification results and training error rates by changing AR order and adding noise. From experimental results, we conclude that classification results using feature vectors by EIV analysis indicate more than 90 % stably for less than 10 orders and noise effect comparing to LPC.
Acoustic Investigation on BFP Piping System in a Power Plant
Yang, K.H. ; Cho, C.H. ; Bae, C.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1029~1035
DOI : 10.5050/KSNVE.2011.21.11.1029
Pressure pulsation of exciting sources that generally occurs on the piping system connected to the discharge of BFP(boiler feed water pump) in power plants causes wave reflection, wave interference, resonance, standing wave and so on. But if the operating speed of the pump is changed, the state of the noise and vibration can be done because characteristics of the exciting source are changed. This paper is to investigate the cause of the noise and vibration occurring on the piping system when the operating speed of BFP is down in accordance with lowering of the power generation. It is approached to two points of view ; Firstly, it is examined whether the pulsation source impacts on the shell mode vibration that vibrates radially across the cross-section of the pipe. But it doesn`t affect the shell mode as much as the resonance occurs. Secondly, to find the relation between the pulsation source and the acoustic mode of the piping system, analysis for the piping system by indirect BEM(boundary element method) is carried out. Therefore it is investigated that the mechanism of the noise and vibration relates with acoustic mode of the piping system.
Response Instrumentation Test Acceptance Criteria for APR1400 RVI CVAP
Ko, Do-Young ; Kim, Kyu-Hyung ; Kim, Sung-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1036~1042
DOI : 10.5050/KSNVE.2011.21.11.1036
APR1400 RVI CVAP using the non-prototype category II is being conducted to verify integrity of the RVI design and to secure the CVAP technology. The measurement programs are to confirm vibration analysis results for reactor internals during pre-operational and initial startup testing and to determine the safety margin. One of the important basis for the measurement programs is test acceptance criteria. Therefore, this paper is on establishment of response instrumentation test acceptance criteria for APR1400 RVI CVAP. The established acceptance criteria show that the stress criteria of APR1400 RVI are more conservative values than those of the valid prototype plant(Palo Verde unit 1) and, the displacement criteria of the inner barrel assembly and the upper guide structure were established to 0.03 in and 0.01 in, respectively.
Estimation of Vibration Level Inside an Engine Based on Rigid Body Theory and Measurement Technology
Kim, Byung-Hyun ; Park, Jong-Ho ; Kim, Eui-Yeol ; Lee, Sang-Kwon ; Kim, Tae-Jeong ; Heo, Jeong-Ki ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1043~1050
DOI : 10.5050/KSNVE.2011.21.11.1043
This paper presents practical results for the estimation of vibration level inside a powertrain based on the rigid body theory and measurement. The vibration level of inside powertrain has been used for the calculation of excitation force of an engine indirectly. However it was difficult to estimate or measure the vibration level inside of a powertrain when a powertrain works on the driving condition of a vehicle. To do this work, the rigid body theory is employed. At the first, the vibration on the surface of a powertrain is measured and its results are secondly used for the estimation the vibration level inside of powertrain together with rigid body theory. Also did research on how to decrease the error rate when the rigid body theory is applied. This method is successfully applied to the estimation of the vibration level on arbitrary point of powertrain on the driving condition at the road.
The Reliability-based Design Optimization for the Military Communication Equipment considering the Dimension Uncertainty
Park, Dae-Woong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1051~1058
DOI : 10.5050/KSNVE.2011.21.11.1051
The military communication equipment is required the high reliability for operating adequate functions under severe conditions. This reliability is the essential element for the quality of the product, for the uncontrolled factors, such as the clearance, damage of the material, the reduction of stiffness, which are the designer is unable to handle. In this paper, the uncertainty for the dimension was supposed to the probability model for the military communication equipment, and the average of the objective function was minimized for reducing design uncertainty. The reliability-based design optimization which was implemented the limit state function was formulated into the mathematical model, so the reliable optimized structure was implemented than the base-line design.
Absorption Characteristics of Micro-perforated Panel Absorber According to High Incident Pressure Magnitude and Variation of Geometric Parameters
Park, Soon-Hong ; Seo, Sang-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1059~1066
DOI : 10.5050/KSNVE.2011.21.11.1059
The micro-perforated panel absorber(MPPA) is one of promising noise control elements because of its applicability to extreme environments where general porous materials cannot be used. Since the MPPA is inherently non-porous sound absorber, it can be a good candidate of acoustic protection system of a space launcher. The overall sound pressure level inside payload fairings of commercial launch vehicles is so high(around 140 dB OASPL) that the conventional linear impedance model cannot be directly applied to the design of the acoustic protection systems. In this paper an acoustic impedance models of a micro-perforated panel absorber at high sound pressure environment were reviewed and the use of the impedance on the practical design of MPPAs was addressed. The variation of absorption characteristics of MPPA was discussed according to the design parameters, e.g., perforation ratio, the minute hole diameter, the thickness of MPP and the incident sound pressure level.
Performance Evaluation of a Full Vehicle with Semi-active MR Suspension at Different Tire Pressure
Kim, Hyung-Seob ; Seong, Min-Sang ; Choi, Seung-Bok ; Kwon, Oh-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1067~1073
DOI : 10.5050/KSNVE.2011.21.11.1067
This paper presents the performance of a full vehicle MR suspension system at different tire pressure. The pressure of tire is related to tire stiffness, which is significantly affects the performance of suspension system. Therefore, in this research, the effectiveness of tire pressure on full vehicle MR suspension is evaluated. As a first step, the characteristic of tire with respect to pressure is experimentally tested and modeled. After that, the governing equation of MR damper and full vehicle MR suspension system are derived. The skyhook controller is implemented and the vibration control performance of full vehicle MR suspension is evaluated via simulation with respect to the tire pressure.
Experimental Analysis on Barrel Zoom Module of Digital Camera for Noise Source Identification and Noise Reduction
Kwak, Hyung-Taek ; Jeong, Jae-Eun ; Jeong, Un-Chang ; Lee, You-Yub ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 11, 2011, Pages 1074~1083
DOI : 10.5050/KSNVE.2011.21.11.1074
Noise of digital camera has been noticeable to its users. Particularly, noise of a barrel assembly module in zoom in/zoom out operation is recorded while taking a video. Reduction of barrel noise becomes crucial but there are not many studies on noise of digital camera due to its short history of use. In this study, experiment-based analyses are implemented to identify sources of noise and vibration because of complexity and compactness of the barrel system. Output noise is acquired in various operation conditions using synchronization for spectral analysis. Noise sources of a barrel assembly in zoom operating are first identified by the comparison with gear frequency analysis and then correlation analysis between noise and vibration is applied to confirm the generation path of noise. Analysis on noise transfer characteristic of zoom module is also carried out in order to identify the most contributing components. One of possible countermeasures of noise in zoom operating is investigated by an experimental approach.