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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
Actively Controlled Sound Field of Upper Sections Attached to Noise Barriers
Koh, Hyo-In ; Lee, Chan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 891~896
DOI : 10.5050/KSNVN.2005.15.8.891
On the basis of theoretical studies on the effect of the cylinders attached to semi-infinite screens, the tangential sound power-transport parallel to the surface of the attached cylinder is minimized by means of a secondary sound field, which is generated from a part of the attached cylinder. The numerical study shows the possibility of deflecting the incident sound by minimizing the sound field of the upper sections. The acoustical shadow region was more pronounced in both near- and far-field compared to the passive case with rigid surface, i.e. without active control. For a relatively wide frequency range it was possible to enhance shielding effects only with few secondary sources and error microphones. In this paper effects of control parameters on the actively controlled sound field near the top edge of noise barriers are studied. Results of numerical study and model measurements are shown and discussed.
A Study on Randomization of Tining Space for Reducing Road Noise
Jung, Soon-Chul ; Woo, Jong-Won ; Kim, Yong-Soo ; Lee, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 897~903
DOI : 10.5050/KSNVN.2005.15.8.897
When driving on uniformly tining concrete pavement road, the whine noise which has high spectrum at the specific frequency related to the uniform tining space exist. In this paper, a randomization method of tining space for concrete pavements is proposed to reduce the whine noise. The proposed method is developed based on the LCG(linear congruential generator) algorithm. The design parameters used in the method are number of different tining space, ratio of each tining space, total linings of each size. sequence of actual tining under given constant drag length and texture. Monte Carlo simulations are used to validate the proposed method.
Development of Noise Annoyance Scale and Criteria of Residential Noises through Auditory Experiments
Ryu, Jong-Kwan ; Jeon, Jin-Yong ; Kim, Heung-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 904~910
DOI : 10.5050/KSNVN.2005.15.8.904
A 7-point verbal noise annoyance scale for residential noises was developed in this study. An auditory experiment using major residential noises such as air-borne, bathroom drainage, and traffic noises was conducted to develop a noise annoyance scale for rating residential noises and allowable limit of them. The modifiers used in the scales were selected according to the method proposed by ICBEN(international commission on the biological effect of noise) Team 6. Results showed that the intensity of the selected words in the 7-point noise annoyance scale was highly correlated with noise levels. and that the intensity difference between each pair of successive levels in the 7-point annoyance scale was almost identical. The allowable limit of residential noise was also investigated in the auditory experiment and that of airborne, drainage and traffic noises were 42.3 dB(A), 41.0 dB(A) and 42.7 dB(A), respectively.
A Study on the Performance Comparison of Optimization Techniques on the Selection of Control Source Positions in an Active Noise Barrier System
Im, Hyoung-Jin ; Baek, Kwang-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 911~917
DOI : 10.5050/KSNVN.2005.15.8.911
There were many attempts to reduce noise behind the noise barrier using active control techniques. Omoto(1993) Shao(1997) and Yang(2001) tried to actively control the diffracted noise behind the barrier and main concerns were about the arrangement methods for the control sources. Baek (2004) tried to get better results using the simulated annealing method and the sequential searching technique. The main goal of this study is to develop and compare the performance of several optimization techniques including those mentioned above, hybrid version of simulated annealing and genetic algorithm for the optimal control source positions of active noise barrier system. The simulation results show fairly similar performance lot the small size of searching problem. However, as the number of control sources are increased, the performance of simulated annealing algorithm and genetic algorithm are better than the others. Simulations are also made to show the performance of the selected optimal control source positions not only at the receiver position but at the surrounding volume of the receiver position and plotted the noise reduction level in 3-D.
The Vibration Velocity and Vibration Level of Near-field Blasting Vibration in an Urban Blasting Site
Lee, Yeon-Soo ; Chang, Seo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 918~923
DOI : 10.5050/KSNVN.2005.15.8.918
The vibration level (dB(V)) and vibration velocity (cm/sec) on the ground and buildings due to the differences of the measuring sites from the blasting source was investigated. To compare with vibration level and vibration velocity theirs magnitude was not surely directly proportional and vibration velocity 0.1 cm/sec was
dB(V). The difference between the measured vibration level and the calculated vibration level by Ejima`s equation using vibration velocity PVS(peak vector sum) showed
dB(V) on the ground,
dB(V) on the apartment, respectively. And the correlation of vibration velocity and nitration level at the measuring sites of lower altitude showed higher than that of higher altitude.
A Helmholtz Resonator Array Panel for Low Frequency Sound Absorption
Kim, Yang-Hann ; Kim, SangRyul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 924~930
DOI : 10.5050/KSNVN.2005.15.8.924
Sound absorptive materials have good performance in high frequency range, not at low frequencies. Therefore it has been great challenge to develop a sound absorbing structure that is good at low frequency. We propose to use a Helmholtz resonator array panel for this purpose. A Helmholtz resonator is one of noise control elements widely used in many practical applications. The resonator is a simple structure composed of a rigid-walled cavity with a neck, but it has very high performance at resonance frequency. This paper discusses the sound absorption of Helmholtz resonator array panels at normal and random incidence. First, various experimental results are introduced and studied. Secondly, we theoretically predict the absorptive characteristics of the resonator away panel. The theoretical approach is based on the Fourier analysis for a periodic absorber. We believe that this method can be used to design a panel for low frequency noise control.ᤐ돀邰ﶖ⨀塨���⨀롯ﺖ⨀돐?ﺖ⨀偠잖⨀ﺖ⨀줏덐ﺖ⨀젏ꠏ
Design of MEMS Resonator Array for Minimization of Mode Localization Factor Subject to Random Fabrication Error
Kim, Wook-Tae ; Lee, Chong-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 931~938
DOI : 10.5050/KSNVN.2005.15.8.931
This paper presents a robust optimal design method for a periodic structure type of MEMS resonator that is vulnerable to mode localization. The robust configuration of such a MEMS resonator to fabrication error is implemented by changing the regularity of periodic structure For the mathematical convenience, the MEMS resonator is first modeled as a multi-pendulum system. The index representing the measure of mode variation is then introduced using the perturbation method and the concept of modal assurance criterion. Finally, the optimal intentional mistuning, minimizing the expectation of the irregularity measure for each substructure, is determined for the normal distributed fabrication error and its robustness in the design of MEMS resonator to the fabrication error is demonstrated with numerical examples.
Development of a Sound Quality Index for the Evaluation of an Intake Noise of a Passenger Car
Lee, J.K. ; Park, Y.W. ; Chai, J.B. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 939~944
DOI : 10.5050/KSNVN.2005.15.8.939
In this paper, a sound quality index for the evaluation of the vehicle intake noise was developed through a correlation analysis of the objective measurement and the subjective evaluation. First, intake orifice noise was measured at the wide-open throttle sweep condition. And then, the acoustic transfer function between intake orifice noise and interior noise was measured. Simultaneously, subjective evaluation was carried out with a 10-scale score by 8 special engineers. The correlation analysis between the psychoacoustic parameters derived from the measurement and the subjective evaluation was performed. The most critical factor was determined and the corresponding sound quality index for intake noise was obtained from the multiple factor regression analysis method. Finally, the effectiveness of the proposed index was validated.
Study on the Evaluation of Sound Quality of a Vehicle Interior Noise
Lee, J.K. ; Chai, J.B. ; Jang, H.K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 945~953
DOI : 10.5050/KSNVN.2005.15.8.945
The purpose of this paper is to develop a linear regression model for the sound quality index of vehicle Interior noise. For this, objective measurement data of the vehicles driving in acceleration was measured. On the basis of analysis, psychoacoustic parameters were extracted and subjective evaluation was performed by noise and vibration expert evaluators. For the subjective evaluation, the paired comparisons and the semantic differential methods were used to evaluate sound quality of vehicle interior noise. By the paired comparison which evaluate two pairs of vehicle interior noise, the preference was estimated. With the semantic differential and the factor analysis, it was evaluated words of two pairs which expressed appropriately the sense of evaluator about noise source. Therefore the characteristics of the sound qualify for the vehicle were differentiated. From the results of both the correlation analysis and the multiple factor regression analysis, the sound quality evaluation model for the sense of human hearing was derived and indexed.
Implementation of Auto-tuning Positive Position Feedback Controller Using DSP Chip and Microcontroller
Kwak, Moon K. ; Kim, Ki-Young ; Bang, Se-Yoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 954~961
DOI : 10.5050/KSNVN.2005.15.8.954
This paper is concerned with the implementation of auto-tuning positive position feedback controller using a digital signal processor and microcontroller. The main advantage of the positive position feedback controller is that it can control a natural mode of interest by tuning the filter frequency of the positive position feedback controller to the natural frequency of the target mode. However, the positive position feedback controller loses its advantage when mistuned. In this paper, the fast fourier transform algorithm is implemented on the microcontroller whereas the positive position feedback controller is implemented on the digital signal processor. After calculating the frequency which affects the vibrations of structure most, the result is transferred to the digital signal processor. The digital signal processor updates the information on the frequency to be controlled so that it can cope with both internal and external changes. The proposed scheme was installed and tested using a beam equipped with piezoceramic sensor and actuator. The experimental results show that the auto-tuning positive position feedback controller proposed in this paper can suppress vibrations even when the target structure undergoes structural change thus validating the approach.
A Study of the Twin Impulse Wave Discharged from the Exit of Two Parallel Tubes
Kang, Sung-hwang ; Kim, Jae-Ho ; Kim, Heuy-dong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 962~967
DOI : 10.5050/KSNVN.2005.15.8.962
The twin-impulse wave discharged from two parallel tubes is investigated to see flow patterns, compared with the single impulse wave. In the present study, the merging phenomena and propagation characteristics of the impulse waves are investigated by experiment and numerical computation. The Harten-Yee`s total variation diminishing scheme is used to solve the unsteady, two-dimensional, compressible, Euler equations. The Mach number Ms of incident shock wave is lower than 1.5 and the distance between the tubes is between 1.2 and 4.0. In the shock tube experiment, the twin impulse waves are visualized by a Schlieren optical system in order to validate the computational result. It is shown that on the symmetric axis between two parallel tubes, the peak pressure produced by the twin impulse waves and its location strongly depend upon the tube distance and the incident shock Mach number, Ms. The predicted Schlieren images show a good agreement with the measured twin-impulse wave.
Free Vibration Analysis of Fluid Vessel with Annular and Circular Plates
Jeong, Kyeong-Hoon ; Kim, Jong-In ; Park, Jin-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 968~974
DOI : 10.5050/KSNVN.2005.15.8.968
An analytical method for the hydroelastic vibration of a vessel composed of an upper annular plate and a lower circular plate is developed by the Rayleigh-Ritz method. The two plates are clamped along a rigid cylindrical vessel wall. It is assumed that the fluid bounded by a rigid cylindrical vessel is incompressible and non-viscous. The wet mode shape of the plates is assumed as a combination of the dry mode shapes of the plates. The fluid motion is described by using the fluid displacement potential and determined by using the compatibility conditions along the fluid interface with the plate. Minimizing the Rayleigh quotient based on the energy conservation gives an eigenvalue problem. It is found that the theoretical results can predict well the fluid-coupled natural frequencies comparing with the finite element analysis result.
Torsional Vibration of a Hollow Shaft Subjected to a Moving Mass
Park, Yong-Suk ; Hong, Sung-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 975~979
DOI : 10.5050/KSNVN.2005.15.8.975
The analysis of a mechanical system, body traveling along the elastic structure, has been a topic of interest. The establishment of analytical method for the development and control of this system is required in the fields of many machine operations such as modern weapons and high-speed feed drive system for a machine tool. The dynamic equations are derived on the torsion of a cantilever hollow shaft induced by the spin-up of a moving mass and the displacement of the mass. Influences of design parameters such as the inertia ratio, the mass moving speed and the friction coefficient are discussed on the transient response of the system.
An Experimental Study on the Effect of Introducing Sound In the City Riversides for Soundscape Application
Lee, Tai-gang ; Song, Min-Jeong ; Jang, Gil-soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 980~987
DOI : 10.5050/KSNVN.2005.15.8.980
It is very difficult to reduce ambient noise level in the downtown. The best method is to improve the sound amenity of the districts, considering concept of soundscape. This study aims to survey the effect of introducing sound and masking to reduce the background noise level. We carried out the evaluating test for 18 introducing sounds varied S/N ratio(-5, 0, +5) in the city riverside. In these test, subjects evaluated the sound environment with five bipolar adjective scales. It was evaluated that introducing sounds improved the sound environment, and that S/N +5 dB was very appropriate to mask the background noise. But the hearing level was suggested to be S/N 0 dB or less.
Countermeasure on High Vibration of Branch Pipe with Pressure Pulsation Transmitted from Main Steam Header
Kim, Yeon-Whan ; Bae, Yong-Chae ; Lee, Young-Shin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 8, 2005, Pages 988~995
DOI : 10.5050/KSNVN.2005.15.8.988
Vibration has been severly increased at the branch pipe of main steam header since the commercial operation of nuclear power plant. Intense broad band disturbance flow at the discontinuous region such as elbow, valve, and header generates the acoustical pulsation which is propagated through the piping system. The pulsation becomes the source of low frequency vibration at piping system. If it coincide with natural frequency of the pipe system, excessive vibration is made. High level vibration due to the pressure pulsation related to high dynamic stress, and ultimately, to failure probability affects fatally the reliability and confidence of plant piping system. This paper discusses vibration effect for the branch pipe system due to acoustical pulsations by broad band disturbance flow at the large main steam header in 700 MW nuclear power plant. The exciting sources and response of the piping system are investigated by using on-site measurements and analytical approaches. It is identified that excessive vibration is caused by acoustical pulsations of 1.3 Hz, 4.4 Hz and 6.6 Hz transmitted from main steam balance header, which are coincided with fundamental natural frequencies of the piping structure. The energy absorbing restraints with additional stiffness and damping factor were installed to reduce excessive vibration.