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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 20, Issue 12 - Dec 2010
Volume 20, Issue 11 - Nov 2010
Volume 20, Issue 10 - Oct 2010
Volume 20, Issue 9 - Sep 2010
Volume 20, Issue 8 - Aug 2010
Volume 20, Issue 7 - Jul 2010
Volume 20, Issue 6 - Jun 2010
Volume 20, Issue 5 - May 2010
Volume 20, Issue 4 - Apr 2010
Volume 20, Issue 3 - Mar 2010
Volume 20, Issue 2 - Feb 2010
Volume 20, Issue 1 - Jan 2010
Selecting the target year
Development of Sound Quality Evaluation System for a Printer Noise Based on Human Sensibility
Park, Sang-Won ; Lee, Hyun-Ho ; Na, Eun-Woo ; Lee, Sang-Kwon ; Park, Yeong-Jae ; Kim, Jong-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 427~436
DOI : 10.5050/KSNVE.2010.20.5.427
The printer sound has many aspects which define its quality because the printer has lots of components and its operation is very complicated. These sound qualities are related to the international competition in printer markets. Recordings inside anechoic chamber were analyzed and a large number of sounds were stimulated using digital signal processing technique. First subjective tests of the printer sound were conducted using semantic different method. By applying factor analysis to the subjective response, two important factors of sound quality were extracted. Second subjective tests were conducted to evaluate the quietness and the impulsiveness of the printer sounds. On the other hand, sound metrics are calculated applying psychoacoustic theories. In this paper, the nonlinear relation between subjective evaluation and sound metrics was identified using artificial neural network and the printer sound quality index was developed. Later, subjective sound quality evaluation will be estimated and evaluated using this index.
Design of Capacitive Displacement Sensor and Gap Measurement with High Precision Using Surface Acoustic Wave Device
Kim, Jae-Geun ; Lee, Taek-Joo ; Lim, Soo-Cheol ; Park, No-Cheol ; Park, Young-Pil ; Park, Kyoung-Su ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 437~443
DOI : 10.5050/KSNVE.2010.20.5.437
SAW device is widely used as band pass filters, chemical or physical sensors, and actuators. In this paper, we propose the capacitive gap measurement system with high precision using SAW device. The research process is mainly composed of theoretical and experimental part. In the theoretical part, equivalent circuit model was used to predict the SAW response by the change of load impedance. In the experimental part, commercialized capacitor was used to see the SAW response by the change of load capacitance to check the feasibility as a sensor unit. After that, experimental setup to measure and adjust the gap was made and the SAW response by the change of gap which caused the capacitance change was measured. Finally, resolution and stroke was decided compared with the signal change and basic measurement noise level.
Design and Performance Evaluation of Electro-rheological Shock Absorber for Electronic Control Suspension
Sung, Kum-Gil ; Choi, Seung-Bok ; Park, Min-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 444~452
DOI : 10.5050/KSNVE.2010.20.5.444
This paper presents design and performance evaluation of electro-rheological(ER) shock absorber for electronic control suspension(ECS). In order to achieve this goal, a cylindrical ER shock absorber that satisfies design specifications for a mid-sized commercial passenger vehicle is designed and manufactured to construct ER suspension system for ECS. After experimentally evaluating dynamic characteristics of the manufactured ER shock absorber, the quarter-vehicle ER suspension system consisting of sprung mass, spring, tire and the ER shock absorber is constructed in order to investigate the ride comfort and driving stability. After deriving the equations of the motion for the proposed quarter-vehicle ER suspension system, the skyhook controller is implemented for the realization of quarter-vehicle ER suspension system. In order to present control performance of ER shock absorber for ECS, ride comfort and driving stability characteristics such as vertical acceleration and tire deflection are experimentally evaluated under various road conditions and presented in both time and frequency domain.
Analysis of Stability and Dynamic Behaviour of Cracked Cantilever T-beams Subjected to Axial Force
Son, In-Soo ; Jo, Jeng-Rae ; Yoon, Han-Ik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 453~459
DOI : 10.5050/KSNVE.2010.20.5.453
In this paper, the purpose is to investigate the stability of cracked cantilever T-beams subjected to axial force. In addition, an analysis of the natural frequency of a cracked beams as crack position, crack depth and tip mass is investigated. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by the energy expressions using extended Hamilton's Principle. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. The results of this study will contribute to the safety test and stability estimation of structures of a cracked T-beams subjected to axial force.
Simulating a Time Reversal Process for A
Lamb Wave Mode on a Rectangular Plate Using a Virtual Sensor Array Model
Park, Hyun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 460~469
DOI : 10.5050/KSNVE.2010.20.5.460
This paper presents the analysis of a time reversal process for
Lamb wave mode(
mode) on a rectangular plate. The dispersion characteristic equation of the
mode is approximated using the Timoshenko beam theory. A virtual sensor array model is developed to consider the effects of reflections occurring on the plate boundary on the time reversal process. The time reversal process is formulated in the frequency domain using the virtual sensor array model. The reconstructed signal is obtained in the time domain through an inverse fast Fourier transform. The validity of the proposed method is demonstrated through the comparison to the numerical simulation results computed by the finite element analysis.
A Study on the Structure-borne Noise Reduction of Refrigerators Using Taguchi Method
Son, Sol-San ; Seo, Jea-Young ; Lee, Boo-Youn ; Kim, Won-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 470~476
DOI : 10.5050/KSNVE.2010.20.5.470
In this work, the mechanism of structure-borne noise resulting from vibration of a compressor for a refrigerator is experimentally analyzed and an effective method is proposed to reduce the noise. Firstly, the emission noise, when the compressor is turned on and off, is measured and analyzed to identify the generation mechanism of structure-borne noise. And the acceleration on the outer wall of the refrigerator is also analyzed to identify the distribution of vibration. Secondly, an effective design method to reduce the noise is suggested by using the finite element analysis and Taguchi method. Consequently an optimal design of the refrigerator, which has lower noise, is obtained and then its performance and validity are verified through the analysis and test.
A Study on the Techniques to Evaluate Carbody Accelerations after a Train Collision
Kim, Joon-Woo ; Koo, Jeong-Seo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 477~485
DOI : 10.5050/KSNVE.2010.20.5.477
In this study, we suggested several approaches to evaluate the collision acceleration of a carbody under the article 16 of the Korean rolling stock safety regulations. There are various methods to evaluate the rigid body accelerations such as the displacement comparison method by double integration of filtered acceleration data, the velocity comparison method by direct integration of filtered acceleration data, and the analysis method of a velocity-time curve. We compared these methods one another using the 1D dynamic simulation model of Korean high-speed EMU composed of nonlinear springs or bars, dampers, and masses. From the simulation results, the velocity-time curve analysis method and the displacement comparison method are recommended to filter high frequency oscillations and evaluate the maximum and average accelerations of a carbody after a train collision.
A Study on the Vibration Reduction of the SPR(sudden pressure relay) in the Single Phase Main Power Transformers(345kV)
Park, Chul-Jun ; Lee, Seong-Wook ; Choi, Won-Ho ; Lee, Wook-Ryun ; Kweon, Ki-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 486~491
DOI : 10.5050/KSNVE.2010.20.5.486
In this paper, it is identified that high-level vibration of the single phase main power transformers shut down due to the mechanical fault. vibration sources of the SPR in the transformer's are identified and the SPR vibrations are reduced by structural modification. For vibration characteristic identification, vibration signals were measured with an accelerometer when the transformer is driving. These signals are presented in a FFT analysis in order to find the dependency of frequency components on the transformer. From finite element analyses and some experiments, it is also found that resonances occur because the natural frequencies of the SPR exist in usual driving range. To shift the natural frequencies outside the driving range, the SPR is modified by increasing stiffness. It is verified that considerable amounts of vibration are reduced by the structural modification.
Free Vibration Analysis of Composite H-Type Cross-section Beams
Kim, Sung-Kyun ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 492~501
DOI : 10.5050/KSNVE.2010.20.5.492
Equations of motion of thin-walled composite H-type cross-section beams incorporating a number of nonclassical effects of transverse shear and primary and secondary warping, and anisotropy of constituent materials are derived. The vibrational characteristics of a composite thin-walled beam exhibiting the circumferentially asymmetric stiffness system(CAS) and the circumferentially uniform stiffness system(CUS) are exploited in connection with the bending-transverse shear coupling and the bending-twist coupling resulting from directional properties of fiber reinforced composite materials.
Noise Diagram of an Automotive Turbo Charger and Its Applications
Lee, Hyeong-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 5, 2010, Pages 502~509
DOI : 10.5050/KSNVE.2010.20.5.502
A test facility which can simultaneously measure turbocharger operating condition variables and vibro-acoustic emission in the situations that are quite similar to real internal combustion engine operating conditions has been introduced. Using this facility, a new method sweeping from full open throttle to deep surge region along constant speed curves can be utilized instead of the stationary method that has been traditionally used to obtain turbocharger compressor maps. Data covering an extensive range of the compressor performance map have been collected and analyzed. An experimental study is performed to define a noise diagram that correlates vibro-acoustic measurements to aerothermodynamic operating conditions. An instrumentation set in the facility allows the automatic definition of the operating point on the turbine and compressor map of the turbocharger. Also, radiated sound pressure and casing vibration data corresponding to the point are obtained by a microphone in the vicinity of the compressor casing and an accelerometer on the casing. The major source(s) of noise at specific operating point on the map can be easily identified with these maps. Also, acoustic characteristics of a given turbocharger at the vicinity of the surge as well as in the surge are also defined. Finally, the possibility to define mild surge region of a turbocharger using vibro-acoustic measurements is studied.