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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
Study on the Prediction Technique of Vehicle Performance Using Parameter Analysis
Kim, Ki-Chang ; Kim, Chan-Mook ; Kim, Jin-Taek ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 995~1000
DOI : 10.5050/KSNVE.2010.20.11.995
With the development of the auto industry, the automobile manufacturers demand to shorten development period and reduce the cost. Compared with the traditional method, applying the virtual prototype is more economical. This paper presents a method for parameters sensitivity analysis and optimizing the performance of vehicle noise and vibration. The existing design processes were repeatedly analyzed with a focus on vehicle performance to decide the design parameters of dimension, thickness, mounting type of body and chassis systems in the vehicle development period. This paper describes the prediction technique of vehicle performance using L18 orthogonal array layout, quality deviation analysis and parameter sensitivity analysis for robust design. This paper analyzed the performance correlation equation through the frequency and sensitivity database according to a design factor change. The new concept is that the performance prediction is possible without repeated activities of test and analysis. This paper described the parameter analysis applications such as bush dynamic stiffness and bush void direction of rear suspension. Design engineer could efficiently decide the design variable using parameter analysis database in early design stage. These improvements can reduce man hour and test development period as well as to achieve stable NVH performance.
Establishment for Regulation Standards of Architectural Facility Noise Using Psycho-acoustic Experiment
Ju, Duck-Hoon ; Yun, Jae-Hyun ; Kim, Jae-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1001~1008
DOI : 10.5050/KSNVE.2010.20.11.1001
The architectural, facility makes the housing environment more pleasant, while too much noise coming from machinery room is detrimental to the workers physically and mentally. Therefore, more sound insulation and sound proof policies are increasingly required. However, as the annoyance caused by facility noise is influenced by various human listening characteristics as well as physical characteristics such as sound pressure level, it requires subjective evaluation characteristics through acoustic-psychological approach. For this purpose, the facility noise in the machinery room was actually measured and analyzed in the field to understand physical characteristics, and the correlation between physical evaluation value and psychological response value through listening test. Further, this study aims at presenting the data to set the standards of 'Just noticeable difference' of the facility noise together with reasonable evaluation with psychological reaction, through the grading of facility noise using trend formula. In the result, 13 stages of physical properties were forecasted for each evaluation method, together with 'Just noticeable difference' using the grading of architectural facility noise.
Feature Vector Decision Method of Various Fault Signals for Neural-network-based Fault Diagnosis System
Han, Hyung-Seob ; Cho, Sang-Jin ; Chong, Ui-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1009~1017
DOI : 10.5050/KSNVE.2010.20.11.1009
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 various techniques such as signal processing and pattern recognition. Recently, fault diagnosis systems using artificial neural network have been proposed. For effective fault diagnosis, this paper used MLP(multi-layer perceptron) network which is widely used in pattern classification. 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 the decision method of the proper feature vectors about each fault signal for neural-network-based fault diagnosis system. We applied LPC coefficients, maximum magnitudes of each spectral section in FFT and RMS(root mean square) and variance of wavelet coefficients as feature vectors and selected appropriate feature vectors as comparing error ratios of fault diagnosis for sound, vibration and current fault signals. From experiment results, LPC coefficients and maximum magnitudes of each spectral section showed 100 % diagnosis ratios for each fault and the method using wavelet coefficients had noise-robust characteristic.
Identification of Printer Noise Source and Its Sound Quality Evaluation System Development
Park, Sang-Won ; Yang, Hong-Jun ; 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 11, 2010, Pages 1018~1024
DOI : 10.5050/KSNVE.2010.20.11.1018
The printer noise consists of the noise of the various components and parts such as motor, fan and solenoid. And the human's printing sound recognition shows various aspects when the printer starts to print papers because the components operate at the same time. Especially, printers are usually installed in the quiet office room. Therefore the printing noise is related to its competitiveness in the market. The importance of the printer sound qualities is increasing and it is necessary to develop the sound quality evaluation system, so it is a key point to identify the noise source of the printer and develop the sound quality index to each component. By using this evaluation system, it is possible to evaluate the sound quality of a prototype printer compared to the already existing one. In this paper, the printer sound quality evaluation system was developed by the following steps. Firstly, the signal processing method was applied to the recorded printing sound to identity and split the noise of components. Secondly, the MLR(multiple linear regression) method and the psychoacoustics were used to develop the sound quality index. Finally, the improvement of the printer sound quality is possible by using the result of the MLR and the path analysis. The output of this research will be applied to the development of a new printer.
Fracture Mechanism of Gas Turbine Compressor Blades in a Combined Cycle Power Plant
Yang, Kyeong-Hyeon ; Song, Oh-Seop ; Cho, Cheul-Whan ; Yun, Wan-No ; Jung, Nam-Geun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1025~1032
DOI : 10.5050/KSNVE.2010.20.11.1025
Gas turbine compressor blades used in a combined cycle power plant are possibly damaged and fractured during their operation. There are two possible causes of the failure of compressor blades; one is a defect of material quality which can be detected through some microscopic inspections for the fracture section, the other is high cycle fatigue problem caused by vibration and can be diagnosed by carrying out dynamic characteristics analysis for the blades. In this paper, in order to determine the cause of the failure of compressor blades in a combined cycle power plant, examination of the fracture section and the propagation mechanism of the crack via stress analysis are performed. Dynamic characteristics analysis via FRF estimation is also performed to identify the cause of failure.
Parameter Studies for Measuring Vibration by Using Camera
Jeon, Hyeong-Seop ; Choi, Young-Chul ; Park, Jin-Ho ; Park, Jong-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1033~1037
DOI : 10.5050/KSNVE.2010.20.11.1033
Accelerometer and laser vibrometers are widely used to measure vibration of structures like a building or piping. Recently, the research measuring vibration by using camera image is introduced. This method can measure multi-points simultaneously. Also, it is possible to measure in the long distance. When we measure the vibration using a camera, the parameter analysis is needed. Therefore, this paper took the experiment for the camera lens selection. An error by the camera images characteristic was theoretically analyzed and we verified through an experiment. And the accuracy of the method measuring the vibration displacement by using the camera images was analyzed.
Analysis of an Electromagnetically Biased Combined Radial and Axial Magnetic Bearing
Na, Uhn-Joo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1038~1045
DOI : 10.5050/KSNVE.2010.20.11.1038
The theory for a new electromagnetically biased combined radial and axial magnetic bearing is developed. This combined magnetic bearing uses two axial coils to provide the bias flux to the radial and axial air gaps of the combined bearing. One dimensional magnetic circuit model for this combined magnetic bearing is developed and analyzed such that flux densities and magnetic forces can be obtained. Three dimensional finite element model for the bearing is also developed and analyzed. Numerical analysis shows that the calculated magnetic forces from 1D model are well matched with those from the finite element model.
Design and Performance Evaluation of MR Damper for Integrated Isolation Mount
Seong, Min-Sang ; Lim, Seung-Gu ; Choi, Seung-Bok ; Kim, Cheol-Ho ; Woo, Je-Kwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1046~1051
DOI : 10.5050/KSNVE.2010.20.11.1046
This paper presents design and performance evaluation of magnetorheological(MR) damper for integrated isolation mount. The MR damper needs two functions for the integrated isolation mount. The one is vibration absorption and the other is isolation of vibration transmission. For vibration absorption, the MR damper requires wide damping force range. And for isolation of vibration transmission, the friction of MR damper needs to be eliminated. In order to achieve this goal, a novel type of MR damper is originally designed in this work. Subsequently, the MR damper is mathematically modeled and its damping force characteristics are evaluated. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated. From the result, this paper evaluates the performance of MR damper for integrated isolation mount.
Dynamic Stability Analysis of a Rotating Blade Considering Gravity Effect
Jung, Kang-Il ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1052~1057
DOI : 10.5050/KSNVE.2010.20.11.1052
Dynamic stability of rotating blade considering gravity effect is investigated in this paper. Equations of motion for the beam is derived by employing hybrid deformation variable method and transformed into dimensionless form. The present modeling method is verified by RecurDyn. Stability diagrams are presented to show the influence of the configuration of the beam and angular velocity on the dynamic stability by applying Floquet's theory. Since the natural frequencies are varied when the blade has rotating motion, it is found that relatively large unstable regions exist approximately 1.1 times as high as the first bending natural frequency and half of the sum of first and second bending natural frequency.
Vibration Analysis of a Rotating Cantilever Beam with Tip Mass Using DTM
Kim, Min-Ju ; Kang, Nam-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1058~1063
DOI : 10.5050/KSNVE.2010.20.11.1058
The vibration analysis of a rotating cantilever beam with tip mass was studied by using DTM(differential transformation method). DTM is one of the numerical methods, for finding series solutions by transforming differential equations to algebraic ones similar with Laplace transform. The advantages of the DTM are that it is easy to understand and is effective in finding numerical solutions. Applying DTM, the natural frequencies of a rotating cantilever beam were obtained taking into consideration the effects of tip mass. Also, convergence study of DTM was performed to decide the number of terms used in eigenvalue problems. Numerical results obtained by DTM show good agreement with those by other methods. As a result, it is expected that DTM can be a useful method in vibration analysis such as that of a rotating cantilever beam with tip mass.
Design of a Dynamic Absorber Using Permanent Magnet Force
Son, Sol-San ; Kim, Won-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1064~1070
DOI : 10.5050/KSNVE.2010.20.11.1064
In this work, a dynamic absorber with a plate-type cantilever using magnetic force is proposed to reduce the vibration of a compressor directly. The dynamic absorber using magnetic force has some advantages of easily tuning the control frequency by adjusting the magnet spacing and obtaining wider control frequency band. The dynamic absorber is designed theoretically and tested experimentally to estimate the control frequency band. When the compressor is equipped with the dynamic absorber, the vibration of compressor and the noise level of refrigerator are reduced by 30 % and 3.2 dB respectively.
Transfer Path Analysis and Estimation of the Road Noise for the Driving Vehicle
Yang, In-Hyung ; Jeong, Jae-Eun ; Yoon, Ji-Hyun ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1071~1077
DOI : 10.5050/KSNVE.2010.20.11.1071
The reduction of the vehicle interior noise has been the main interest of noise and vibration harshness(NVH) engineers. A passenger vehicle has various and complicated transmission paths of sound and vibration. In order to identify the mechanism of transfer path, estimation of excitation force and exact modeling of transfer path are required. This paper presents method for estimating the noise source contribution on the road noise of the vehicle in a multiple input system where the input sources may be coherent with each other. And vector synthesis technique is employed to identify the characteristics of road noise and its transmission to vehicle compartment through noise and vibration analysis. Vibration reduction efficiency of each transfer path is evaluated by comparing individual vector components obtained virtual simulation.
Study on Smart Cooling Technology by Acoustic Streaming Generated by Ultrasonic Vibration Using 3D PIV
Lee, Dong-Ryul ; Loh, Byoung-Gook ; Kwon, Ki-Jung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1078~1088
DOI : 10.5050/KSNVE.2010.20.11.1078
In order to analyze the quantitative characteristics of acoustic streaming, experimental setup of 3-D stereoscopic PIV(particle imaging velocimetry) was designed and quantitative ultrasonic flow fields in the gap between the ultrasonic vibrator and heat source were measured. Utilizing acoustic streaming induced by ultrasonic vibration, surface temperature drop of cooling object was also measured. The study on smart cooling method by acoustic streaming induced by ultrasonic vibration was performed due to the empirical relations of flow pattern, average flow velocity, different gaps, and enhancement on cooling rates in the gap. Average velocity fields and maximum acoustic streaming velocity in the open gap between the stationary cylindrical heat source and ultrasonic vibrator were experimentally measured at no vibration, resonance, and non-resonance. It was clearly observed that the enhancement of cooling rates existed owing to the acoustic air flow in the gap at resonance and non-resonance induced by ultrasonic vibration. The ultrasonic wave propagating into air in the gap creates steady-state secondary eddy called acoustic streaming which enhances heat transfer from the heat source to encompassing air. The intensity of the acoustic streaming induced by ultrasonic vibration experimentally depended upon the gap between the heat source and ultrasonic vibrator. The ultrasonic vibration at resonance caused the increase of the acoustic streaming velocity and convective heat transfer augmentation when the flow fields by 3D stereoscopic PIV and temperature drop of the heat source were measured experimentally. The acoustic streaming velocity of air enhancement on cooling rates in the gap is maximal when the gap agrees with the multiples of half wavelength of the ultrasonic wave, which is specifically 12 mm.
Identification of Noise Source of the HVAC Using Complex Acoustic Intensity Method
Yang, Jeong-Jik ; Lee, Dong-Ju ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1089~1096
DOI : 10.5050/KSNVE.2010.20.11.1089
The relation between the vibration induced from machinery and the radiated sound is complicated. Acoustic intensity method is widely used to obtain the accuracy of noise measurement and noise identification. In this study, as groundwork, the complex acoustic intensity method is performed to identify noise source and transmission path on different free space point source fields. As an industrial application, the complex acoustic intensity method is applied to HVAC to identify sound radiation characteristics in the near field. Experimental complex acoustic intensity method was applied to HVAC, it is possible to identify noise sources in complicated sound field characteristics which noise sources are related with each other, and certificate the validity of complex acoustic intensity. Especially, it can be seen that complex acoustic intensity method using both of active and reactive intensity is vital in devising a strategy for identification of noise. Also, the vector flow of acoustic intensity was investigated to identify sound intensity distributions and energy flow in the near field of HVAC.
Prediction of Vibrational Responses of Automotive Door System Using Energy Flow Analysis in Medium-to-high Frequencies
Park, Young-Ho ; Hong, Suk-Yoon ; Kil, Hyun-Gwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 11, 2010, Pages 1097~1102
DOI : 10.5050/KSNVE.2010.20.11.1097
In this paper, the energy flow analysis(EFA) of the body-in-white door of a real automotive was performed using the energy flow finite element method(EFFEM) to effectively predict the vibrational responses of built-up structures in the medium to high frequency range. To increase the validity of EFA results, the structural hysteresis damping loss factor was measured by the experiment using the concept of statistical energy analysis(SEA). As the excitation frequency increases, the predicted results simulated with EFFEM generally agree with the experimental results.