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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 23, Issue 12 - Dec 2013
Volume 23, Issue 11 - Nov 2013
Volume 23, Issue 10 - Oct 2013
Volume 23, Issue 9 - Sep 2013
Volume 23, Issue 8 - Aug 2013
Volume 23, Issue 7 - Jul 2013
Volume 23, Issue 6 - Jun 2013
Volume 23, Issue 5 - May 2013
Volume 23, Issue 4 - Apr 2013
Volume 23, Issue 3 - Mar 2013
Volume 23, Issue 2 - Feb 2013
Volume 23, Issue 1 - Jan 2013
Selecting the target year
The Study for the Assessment of the Noise Map for the Railway Noise Prediction Considering the Input Variables
Lee, Jaewon ; Gu, J.H. ; Lee, W.S. ; Seo, C.Y. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 295~300
DOI : 10.5050/KSNVE.2013.23.4.295
The noise map can be applied to predict the effect of noise and establish the noise reduction measure. But the predicted value in the noise map can vary depending on the input variables. Thus, we surveyed the several prediction models and analyzed the changes corresponding to the variables for obtaining the coherency and accuracy of prediction results. As a result, we know that the Schall03 and CRN model can be applied to predict the railway noise in Korea and the correction value, such as bridges correction, multiple reflection correction, curve correction must be used for reflecting the condition of the prediction site. Also, we know that the prediction guideline is an essential prerequisite in order to obtain the unified and accurate predicted value for railway noise.
Dynamic Characteristics Analysis for the Online Monitoring System Designing KTX MRU and Improvement of the Stability Related Variable High Speed
Park, Byung Su ; Kim, Jin Woo ; Choi, Sang Rak ; Song, Young Chun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 301~307
DOI : 10.5050/KSNVE.2013.23.4.301
MRU(motor reduction unit) for KTX is a assembled complex structure that is equipped with a lot of parts at the express train KTX and that is the core power source operating variable speeds. This study is recorded the dynamic characteristics analysis results tested by EMA which is done through the parts and assembly test, transient analysis and stoped train test in order to design the online monitoring system for KTX MRU. And the mode shapes result from critical vibration frequency explain the relation with variable speeds of express train over 250 km/hr. Also these variable speeds make variable operational frequencies at pinion, axle gear mesh frequency and normal bearing fault frequencies. As the specified speed can make resonance with natural frequencies of the MRU, for the train operating stability, this study also presents the MRU`s critical speeds calculated by the each train speed.
Validation of Vibration and Stress Analysis Method for APR1400 Reactor Vessel Internals Comprehensive Vibration Assessment Program
Kim, Kyu Hyung ; Ko, Do Young ; Kim, Sung Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 308~314
DOI : 10.5050/KSNVE.2013.23.4.308
The vibration and stress analysis program of comprehensive vibration assessment program(CVAP) is to theoretically verify the structural integrity of reactor vessel internals(RVI) and to provide the basis for selecting the locations monitored in measurement and inspection programs. This paper covers the applicability of the vibration and stress analysis method of APR1400 RVI CVAP. The analysis method was developed to use 3-dimensional detail hydraulic and structural models with ANSYS and CFX. To assess the method, the hydraulic loads and structural reponses of OPR1000 were predicted and compared with the measured data in the OPR1000 RVI CVAP. The results predicted with this method were close to the measured values considerably. Therefore, the analysis method was developed properly.
Prediction of Interior Noise Caused by Tire Based on Sound Intensity and Acoustic Source Quantification
Shin, Kwang-Soo ; Lee, Sang-Kwon ; Hwang, Sung-Uk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 315~323
DOI : 10.5050/KSNVE.2013.23.4.315
Tire noise is divided into a road noise(structure-borne noise) and a pattern noise(air-borne noise). Whilst the road noise is caused by the structural vibration of the components on the transfer path from tire to car body, the pattern noise is generated by the air-pumping between tire and road. In this paper, a practical method to estimate the pattern noise inside a passenger car is proposed. The method is developed based on the sound intensity and airborne source quantification. Sound intensity is used for identifying the noise sources of tire. Airborne source quantification is used for estimating the sound pressure level generated by each noise source of a tire. In order to apply the airborne source quantification to the estimation of the sound pressure, the volume velocity of each source should be obtained. It is obtained by using metrics inverse method. The proposed method is successfully applied to the evaluation of the interior noises generated by four types of tires with different pattern each other.
Stability Analysis of Nanopipes Considering Nonlocal Effect
Choi, Jongwoon ; Song, Ohseop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 324~331
DOI : 10.5050/KSNVE.2013.23.4.324
In this paper, static and oscillatory instability of a nanotube conveying fluid and modeled as a thin-walled beam is investigated. Analytically nonlocal effect, effects of boundary conditions, transverse shear and rotary inertia are incorporated in this study. The governing equations and boundary conditions are derived through Hamilton`s principle. Numerical analysis is performed by using extended Galerkin method which enables us to obtain more accurate results compared with conventional Galerkin method. Variations of critical flow velocity of carbon nanopipes with two different boundary conditions based on the analytically nonlocal theory and partially nonlocal theory are investigated and pertinent conclusions are outlined.
Roller Design of IRB Seismic Isolation Device Using Test Evaluation : Part II. Heat Treatment of Material
Park, Young-Gee ; Ha, Sung Hoon ; Seong, Min-Sang ; Jeon, Junchul ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 332~337
DOI : 10.5050/KSNVE.2013.23.4.332
This paper presents a subsequent research work on the roller design of IRB(isolation roller bearing) seismic isolation device presented in Part 1 by focusing on heat treatment. The hardness and friction factor are very important factors of material and after-treatment process selection. Normally, roller bearing consists of roller and retainer. The roller gets high pressure constantly, while the retainer gets tensile and compressive stress. Therefore, sensitive material selection and heat treatment of each part is quite important. In this experimental evaluation, carbon steel, chrome special steel and others are employed and their characteristics after heat treatment are identified. Each material is prepared by refining high frequency heat treatment. The friction factor and static load capacity of manufactured material are experimentally identified and destructive test of material is processed. Optimal material and heat treatment conditions for IRB roller bearing are determined based on experiment results.
Vibration Analysis of a Rotating Blade Considering Pre-twist Angle, Cross Section Taper and a Concentrated Mass
Kim, Hyung Yung ; Yoo, Hong Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 338~346
DOI : 10.5050/KSNVE.2013.23.4.338
Equations of motion of a rotating blade considering pre-twist angle, cross section taper and a concentrated mass are derived using the hybrid deformation variable modeling method. For the modeling of a concentrated mass which is located at an arbitrary position of the blade, a Dirac delta function is employed for the mass density function. The final equations for the vibration analysis are transformed into a dimensionless form using several dimensionless parameters. The effects of the dimensionless parameters on the vibration characteristics of the rotating blade are investigated through numerical analysis.
Health Monitoring Method for Monopile Support Structure of Offshore Wind Turbine Using Committee of Neural Networks
Lee, Jong Won ; Kim, Sang Ryul ; Kim, Bong Ki ; Lee, Jun Shin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 347~355
DOI : 10.5050/KSNVE.2013.23.4.347
A damage estimation method for monopile support structure of offshore wind turbine using modal properties and committee of neural networks is presented for effective structural health monitoring. An analytical model for a monopile support structure is established, and the natural frequencies, mode shapes, and mode shape slopes for the support structure are calculated considering soil condition and added mass. The input to the neural networks consists of the modal properties and the output is composed of the stiffness indices of the support structure. Multiple neural networks are constructed and each individual network is trained independently with different initial synaptic weights. Then, the estimated stiffness indices from different neural networks are averaged. Ten damage cases are estimated using the proposed method, and the identified damage locations and severities agree reasonably well with the exact values. The accuracy of the estimation can be improved by applying the committee of neural networks which is a statistical approach averaging the damage indices in the functional space.
Design of a Tracking Gain-up Controller for the Vibration Suppression of Tracking Actuator
Lee, Moonnoh ; Jin, Kyoung Bog ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 356~364
DOI : 10.5050/KSNVE.2013.23.4.356
This paper presents a tracking gain-up controller design method to control effectively the vibration of tracking actuator caused by external shocks and remaining velocity after seek control. A pole placement constraint is considered to assure a desired transient response against the vibration of tracking actuator. A loop gain-up constraint is introduced to hold the tracking gain-up loop gain and control bandwidth within allowable bounds. The pole placement constraint is expressed by a matrix inequality and the loop gain-up constraint is considered as an objective function so that genetic algorithm can be applied. Finally, a tracking gain-up controller is obtained by integrating a genetic algorithm with LMI design approach. The proposed tracking gain-up controller design method is applied to the track-following system of a DVD recording device and its effectiveness is evaluated through the experimental results.
An Experimental Study on the Sound Absorption Property of a Sintered Clay Material
Yang, Yoon-Sang ; Lee, Dong-Hoon ; Seo, Eun-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 365~371
DOI : 10.5050/KSNVE.2013.23.4.365
The purpose of this study is to develop a sound absorbing material for indoor which manufactured by a clay and binding material. The seven kind of sound absorbing specimens which sintered through a mold process at high temperature were manufactured for the purpose of testing sound absorption performance. The random and normal sound absorption coefficients were measured for the sintered clay sound absorbing specimens with different particle size, density and mixture ratio. From the experimental results, it was found that its particle size was closely related to the sound absorption performance. It was shown that the sintered clay sound absorbing specimen had the sound absorption properties of a fiber-type or a resonance-type sound absorbing material depending on the particle size.
Optimal Design of a Muffler with Perforated Plates Considering Pressure Drop
Choi, Dong Wook ; Lee, Jin Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 4, 2013, Pages 372~378
DOI : 10.5050/KSNVE.2013.23.4.372
An acoustical shape optimization problem is formulated for optimal design of a perforated reactive muffler with offset inlet/outlet. The mean transmission loss value in a target frequency range is maximized for an allowed pressure drop value between an inlet and an outlet. Partitions in the chamber are divided into several sub-partitions, whose lengths are selected as design variables. Each sub-partition has the same number of holes, whose sizes are equal. A finite element model is employed for acoustical and flow analyses. A gradient-based optimization algorithm is used to obtain an optimal muffler. The acoustical and fluidic characteristics of the optimal muffler are compared with those of a reference muffler. Validation experiment is carried out to support the effectiveness of our suggested method.