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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
Editor in Chief :
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
Selecting the target year
Development of the Vibration Analysis Model of Passenger Car
Kwon, Soon-Ki ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 291~298
DOI : 10.5050/KSNVE.2011.21.4.291
According to the developments of automobile industry, the technology to enhance noise, vibration and harshness(NVH) performance has been studying in a point of view of ride comfort and quietness. Especially the use of computer aided engineering(CAE) simulation tools such as finite element(FE) analysis allows engineers to efficiently evaluate NVH performance. This paper presents the method to bulid FE models for full vehicle including engine, transmission. suspension and steering system, also to evaluate vibration performance of full vehicle. The full vehicle model, which is discussed, is correlated with the result of the frequency response measurement in the case of the car shake performance for high speed driving.
Experimental Study for Prediction of Ground Vibration Responses by the Low-vibration Pile Driving Methods
Kang, Sung-Hoo ; Jeoung, Sug-Kyu ; Park, Sun-Joon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 299~306
DOI : 10.5050/KSNVE.2011.21.4.299
This study investigated the SIP-method as a low-vibration, low-noise engineering method. The ground vibrations caused by the SIP-method were measured and analyzed in each step. From the analysis results, quantitative ground vibration values and reliable vibration estimation equations were proposed. Furthermore, the ground vibrations caused by the SIP-method were compared with the ground vibrations caused by other methods presented by existing studies. Based on the vibration estimation equation with 50 % reliability, the ground vibration values by the SIP-method at the distance of 10~150 m corresponded to 17~57 % of the ground vibration values by the equation proposed by Attewell & Famer, and 14~96 % of the ground vibration values by the equation proposed by Prof. Park in his study using a diesel drop hammer. These results showed that the ground vibration reduction effect of the SIP-method was higher those of other general engineering methods. Finally, the permissible scope of work using the SIP-method which meets the domestic vibration standards was presented.
A Study on the Improvement of Occupants' Satisfaction for the Sound Environment When the Sound Source of Soundscape is Provided to the Interior Landscape
Kim, Ho-Gon ; Kook, Chan ; Beak, Eun-Sun ; Baek, Geon-Jong ; Song, Min-Jeong ; Shin, Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 307~314
DOI : 10.5050/KSNVE.2011.21.4.307
This study was focused on the influence of soundscape provided to the interior landscape on the improvement of occupants' sound environment. When soundscape was provided to occupants together with the interior landscape rather than simply providing interior landscape, the occupants' satisfaction seemed to be improved. The most preferred sound source among the three sound sources was considered as the sound of the grasshopper. When both of the interior landscape and the landscape substances was provided, the adjectives with the average difference of more than 1 are "Vicissitudinous", "Elegant" and "Cheerful". When the interior landscape and the sound source were provided, such adjectives as "Vicissitudinous", "Complex" and "Cheerful" are extracted. When all the variables were provided, such adjectives as "Vicissitudinous", "Abundant" and "Cheerful" seem to show the difference of more than 1. Regarding "Vicissitudinous", it was possible to know that the average difference of more than 1.5 was the biggest. Regarding the relative values of the
wave and the
wave for each part, it seemed that the highest
wave was generated on the left parietal lobe of P3, while the lowest
wave was generated on the left and right frontal lobes of Fp1 and Fp2. According to this study, it was shown that the soundscape and the interior landscape seemed to influence the improvement of the occupants' sound environment.
Historical Background for Derivation of the Differential Equation mẍ+kx = f(t)
Park, Bo-Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 315~324
DOI : 10.5050/KSNVE.2011.21.4.315
This paper presents a historical study on the derivation of the differential equation of motion for the single-degree-of-freedom m-k system with the harmonic excitation. It was Euler for the first time in the history of vibration theory who tackled the equation of motion for that system analytically, then gave the solution of the free vibration and described the resonance phenomena of the forced vibration in his famous paper E126 of 1739. As a result of the chronological progress in mechanics like pendulum condition from Galileo to Euler, the author asserts two conjectures that Euler could apply to obtain the equation of motion at that time.
Active Control Experiments on High-speed Elevator Vibrations
Kim, Ki-Young ; Kwak, Moon-K. ; Baek, Kwang-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 325~332
DOI : 10.5050/KSNVE.2011.21.4.325
This paper is concerned with the active control experiments on elevator vibrations by means of the active roller guide. To this end, a roller guide was designed using a voice-coil actuator and linear guide. A simple proportional control algorithm combined with the band-pass filter was implemented using the DSP. Based on the initial experiments, a new control system which can handle lateral and front-back vibrations of elevator was built and tested using the elevator test tower. The experimental results show that the elevator vibrations are reduced by the active control technique.
Study on the Analysis Process of the Damping Material for Reduced Floor Vibration
Kim, Ki-Chang ; Hwang, Mi-Kyong ; Seo, Seong-Hoon ; Choi, Ja-Min ; Kim, Chan-Mook ; Kim, Jin-Taek ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 333~338
DOI : 10.5050/KSNVE.2011.21.4.333
This paper describes the design process of floor damping material optimization to reduce structure borne noise. This process uses finite element analysis(FEA) along with experimental techniques to complement each other. The objective of this approach was to develop an optimized damping material application layout and thickness at the initial design stage. The first step is to find the sensitivity areas of vehicle body without damping material applied using FEA. In order to determine the high vibration areas of the floor panel, the velocity was measured using a scanning laser vibrometer from 20 Hz to 300 Hz. To excite the floor panel vibration, shaker was placed at the front suspension attachment point. The second step is the optimization process to determine the light weight solution of damping material. The design guideline of damping material was suggested that the lightweight solution was verified using test result of road noise. Design engineer could efficiently decide the design variable of damping material using parameter analysis results in early design stage.
A Development of the Dynamic Absorber and Damper for Vibration and Noise Reduction of the Personal Computer
Jung, Won-Young ; Lee, Kyu-Ho ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 339~345
DOI : 10.5050/KSNVE.2011.21.4.339
The purpose of this study is reduction the vibration of the personal computer by developing the vibration absorber and damper. The eccentricity of the cooling fan causes the vibration of the computer. We designed the material properties of the vibration absorber and damper by FEM model within operation frequencies of the cooling fan. We experiment the overall analysis and system analysis by using a laser vibrometer. The result shows that the proposed dynamic absorber and damper reduce the vibration of the personal computer.
Dynamic Characteristics and Adaptation of Elastic Coupling with Rubber Type Circular Segments
Lee, D.C. ; Barro, Ronald D ; Kim, J.K. ; Nam, T.K. ; Yu, J.D. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 346~351
DOI : 10.5050/KSNVE.2011.21.4.346
Medium and high speed marine diesel engines with reduction gear have been widely used as prime mover in small car ferries and fishing vessels. The elastic coupling should be installed and complemented the propulsion shafting system to isolate the vibratory torque between engine and reduction gear. In this paper, the dynamic characteristics of elastic coupling with rubber type circular segments is confirmed by theoretical analysis using the FEM and the hydraulic excitation test at shop. Further adaptation was investigated with the torsional vibration test at diesel engine factory shop.
Experimental Evaluation of the Performance of the HSLDS Magnetic Vibration Isolator with Consideration of the Design Parameter
Shin, Ki-Hong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 352~356
DOI : 10.5050/KSNVE.2011.21.4.352
The isolation performance of a linear vibration isolator is limited to the ratio of stiffness to mass it supports. The stiffness of the isolator must be large enough to hold the weight. This results in the deterioration of the isolation performance. Recently, to overcome this fundamental limitation, the HSLDS(high-static-low-dynamic-stiffness) magnetic vibration isolator was introduced and its isolation characteristic was investigated theoretically. In this paper, the isolation performance of the HSLDS magnetic isolator is examined experimentally. Considerable amount of experiments are performed by carefully considering nonlinear characteristics. The experimental results verify the practical usability promisingly and agree with the theoretical studies, i.e. its performance is largely dependent on the key design parameter.
Design and Performance Test of Silencers with Ring-shaped Resonators
Kim, Bong-Ki ; Kim, Sang-Ryul ; Lee, Seong-Hyun ; Lee, Jong-Hwa ; Lee, Hae-Seong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 357~364
DOI : 10.5050/KSNVE.2011.21.4.357
In this study, ring-shaped acoustic resonators were proposed to be installed in a silencer to increase the acoustic performance of silencer in the low-frequency range. Evaluation of noise reduction performance of acoustic resonator arrays was carried out by measuring the random-incidence absorption coefficient. It was found that the absorption coefficient of resonator array was measured up to 1 at 125 Hz of 1/3-octave band center frequency. Insertion losses of silencers with ring-shaped acoustic resonator arrays were measured based on ISO 7235. The results were shown that the ring-shaped resonator could increase the insertion loss up to 13 dB without flow, whereas 7 dB when flow speed reached 15 m/s. As increasing the flow speed above 15 m/s, the effect of acoustic resonator decreased due to the effect of nonlinear air damping of the resonator. It was also found that the increment of pressure drop by the presence of resonator arrays was about 9 % at flow speed of 25 m/s.
Dynamic Response and Vibration Characteristics of an Isolation Rail Track under a Traveling Mass
Oh, B.J. ; Ryu, B.J. ; Kim, J.H. ; Lee, Y.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 365~373
DOI : 10.5050/KSNVE.2011.21.4.365
This paper presents the dynamic response and the vibration characteristics for a rail-track supported by discrete springs and dampers. Recently, automatic conveyer system, rail-track, rack-master system demand the soundproof facilities and vibration suppression measures in order to satisfy the strict environmental standards. The equations of motions of the dynamic characteristics for a vibration suppression rail-track under a traveling mass were derived by Galerkin's mode summation method considering gravity, centrifugal force, Coriolis force, inertia force of the moving mass, transverse inertia of the rail-track. Also, numerical results were calculated by Runge-Kutta integration method. In order to investigate vibration characteristics and dynamic responses, modal testing and measurement of the responses of the rail-track were performed. Through the experiment and numerical simulations, numerical results have a good agreement with experimental ones.
A Numerical Model of an Edge-clamped Rectangular Plate Based on a Mode Method to Predict Acoustic Radiation Characteristics
Yoo, Ji-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 374~383
DOI : 10.5050/KSNVE.2011.21.4.374
A numerical model based on a mode method coupling beams and a rectangular plate is proposed to estimate radiation characteristics of an edge-clamped rectangular plate. The radiation efficiency and radiation power in the audio frequency range including the critical frequency can be predicted. The proposed model is rather simple and straightforward and gives reliable results comparing to the previous studies. The estimated radiation characteristics are compared to those of the pinned condition plates and also to those based on the formulae proposed by Maidanik. The radiation efficiency of the clamped plate seems a little higher than that of the pinned plate in the frequency range of corner and edge modes. It is explicitly shown that the power as well as efficiency at high frequencies is not influenced by these edge boundary conditions.
Free Vibration Analysis of Parabolic Hollowed Beam-columns with Constant Volume
Lee, Tae-Eun ; Lee, Byoung-Koo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 4, 2011, Pages 384~391
DOI : 10.5050/KSNVE.2011.21.4.384
This paper deals with free vibrations of the parabolic hollowed beam-columns with constant volume. The cross sections of beam-column taper are the hollowed regular polygons whose depths are varied with the parabolic functional fashion. Volumes of the objective beam-columns are always held constant regardless given geometrical conditions. Ordinary differential equation governing free vibrations of such beam-columns are derived and solved numerically for determining the natural frequencies. In the numerical examples, hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered. As the numerical results, the relationships between non-dimensional frequency parameters and various beam-column parameters such as end constraints, side number, section ratio, thickness ratio and axial load are reported in tables and figures.