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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
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Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 19, Issue 12 - Dec 2009
Volume 19, Issue 11 - Nov 2009
Volume 19, Issue 10 - Oct 2009
Volume 19, Issue 9 - Sep 2009
Volume 19, Issue 8 - Aug 2009
Volume 19, Issue 7 - Jul 2009
Volume 19, Issue 6 - Jun 2009
Volume 19, Issue 5 - May 2009
Volume 19, Issue 4 - Apr 2009
Volume 19, Issue 3 - Mar 2009
Volume 19, Issue 2 - Feb 2009
Volume 19, Issue 1 - Jan 2009
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Analysis of Noise Characteristic Considering Magnetic Force of IPM Motor
Lee, Hong-Joo ; Kwon, Joong-Hak ; Lee, Chang-Min ; Hwang, Gun-Yong ; Hwang, Sang-Moon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 439~446
DOI : 10.5050/KSNVN.2009.19.5.439
Noise sources in electric machines are broadly categorized as magnetic, mechanical, electronic and aerodynamic. Especially, there are several kinds of noise sources due to the change of reluctance by rotor position in IPM motor. To separate acoustic noise by mechanical structure and electromagnetic sources, resonance frequency and the effect of vibration and acoustic noise by electromagnetic sources are analyzed. And then, the structural and electromagnetic designs to reduce acoustic noise are performed. The relevance about the study on noise reduction of IPM motor is verified by noise experiment, noise and vibration analysis.
Application of the Cepstrum Signal Processing Technique for the Noise Reflection Path Analysis in Community Noise
Hong, Yun-H. ; Kim, Jeung-T. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 447~453
DOI : 10.5050/KSNVN.2009.19.5.447
Community noise has been great concerned in public. A traffic noise from a road or a railway has affected too mush damage on quiet living environment. In this paper, a measured noise signal on a street has been applied to extract a noise source and a path by using a complex cepstrum. An example shows that the waveform of the source and the path could be separated if a temporal windowing is properly applied.
Computation of Internal BPF Noise of Axial Circulating Fan in Refrigerators
Lee, Seung-Yub ; Heo, Seung ; Cheong, Cheol-Ung ; Kim, Seok-Ro ; Seo, Min-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 454~461
DOI : 10.5050/KSNVN.2009.19.5.454
Internal aeroacoustics of an axial fan used for circulating cold air in refrigerators are computed by using the hybrid method where CFD, acoustic analogy and BEM techniques are utilized. The unsteady flow field around the axial fan is predicted by solving the incompressible RANS equations with the conventional CFD techniques. Then, main noise sources are extracted from this unsteady flow field predictions using Acoustic Analogy. Lastly, BPF noise generated from an axial fan are predicted using these modeled sources combined with the tailed Green function techniques, which are numerically solved by the BEM technique. This hybrid model is validated by comparing the prediction with the experiment. Then, parameter studies are carried out, which suggest a capability of the current method as a design tool for the low-noise of the current axial fan system in a refrigerator.
Numerical Analysis of the Mechanical Impedance and Transmitted Vibration of the Foundation for the Equipment in a Naval Vessel
Han, Hyung-Suk ; Son, Yoon-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 462~467
DOI : 10.5050/KSNVN.2009.19.5.462
Reduction of the structure-borne noise of the naval vessel is very important in order to reduce the underwater radiated noise of it. One of the important factors to reduce the structure-borne noise of the installed machine in a ship is the design of the foundation having sufficiently high mechanical impedance. In this paper, the mechanical impedance of the foundation for the fan-coil unit in a naval vessel is evaluated numerically according to variation of the thickness of the foundation. And also, the forced vibration analysis is conducted considering the dynamic property of the anti-vibration mount. Through the analysis results, it can be known that the dynamic property of the anti-vibration mount should be considered when the minimum level of the mechanical impedance of the foundation is set.
PID Tuning Based on RCGA Using Ziegler-Nichols Method
Park, Ji-Mo ; Kim, Go-Eun ; Kim, Jin-Sung ; Park, Sung-Man ; Heo, Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 475~481
DOI : 10.5050/KSNVN.2009.19.5.475
Real-coded genetic algorithm(RCGA) has better performances than conventional genetic algorithm about dealing with a large domain, the precision and the constrain problem. Also the RCGA has advantage of operation time because it doesn't have to following about decoding operation. In this paper the ranges of PID gains are limited based on Ziegler-Nichols method to consider a long operation time problem that is the main problem of genetic algorithm. Result shows proposed method represents better performance without ignored about result of ZN tuning method and reduces the calculation time.
A Study on Acoustic Radiation Reduction of a Vibrating Panel by Using Particle Swarm Optimization Algorithm
Jeon, Jin-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 482~490
DOI : 10.5050/KSNVN.2009.19.5.482
In this paper, the author proposes a new method for acoustic radiation optimum design to minimize noise from a vibrating panel-like structure using a collaborative population-based search method called the particle swarm optimization algorithm(PSOA). The PSOA is a parallel evolutionary computation technique initially developed by Kennedy and Eberhart. The acoustic radiation optimization method based on the PSOA consists of two processes. In the first process, the acoustic radiation analysis by an integrated p-version FEM/BEM, which was developed by using MATLAB, is performed to evaluate the exterior acoustic radiation field of the panel. The second process is to search the optimum design variables: 1) Shape of Bezier curves and 2) Shape and position of ribs, to minimize noise from the panel using the PSOA. The optimization method based on the PSOA is compared to that based on the steady state genetic algorithm(SSGA) in order to verify the effectiveness and validity of the optimal solution by PSOA. Finally, it is shown that the optimal designs of the panel obtained by using the PSOA can achieve effective reductions in radiated sound power.
Structural Analysis and Vibration Characteristics of Scaffolding Structures
Ryu, B.J. ; Lee, C.R. ; Kim, H.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 491~498
DOI : 10.5050/KSNVN.2009.19.5.491
This paper deals with structural analysis and vibration characteristics of scaffolding structures with a hoist according to payloads. In order to analyze the vibrational and structural characteristics for 20-step scaffolding structure, structural and vibrational characteristics for 2-step scaffolding structure were compared with some experimental results. The numerical results for natural frequencies of scaffolding structures have a good agreement with experimental ones. Through the numerical analysis, firstly, it is shown that the maximum stress of scaffolding structures is lower than von-mises yield criteria when four persons with total weight of 280 kgf are working at the top of the scaffolding structures. Secondly, vibration characteristics including natural frequencies and modes for scaffolding structures are shown in case of various kinds of moving masses.
Analysis of Behavior Characteristics of Common Rail System Injector for the Variations of Injector Parameters
Kim, Joong-Bae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 499~508
DOI : 10.5050/KSNVN.2009.19.5.499
This paper focuses on the modelling of common rail diesel injector using the AMESim code and shows the appropriateness of the developed model. For the developed injector model, simulations are carried out to analyze the behavior characteristics of the injector for the variations of injector model parameters such as orifice diameters, rail pressures, and energizing times. Simulation results show that the diameters of inlet and outlet orifices have close relation with injection quantity. Increment of rail pressure and energizing time provides increment of injection quantity, and simulated energizing time map shows injection characteristics of the common rail injector.
Design of Low Noise Engine Cooling Fan for Automobile using DACE Model
Sim, Hyoun-Jin ; Park, Sang-Gul ; Joe, Yong-Goo ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 509~515
DOI : 10.5050/KSNVN.2009.19.5.509
This paper proposes an optimal design scheme to reduce the noise of the engine cooling fan by adapting Kriging with two meta-heuristic techniques. An engineering model has been developed for the prediction of the noise spectrum of the engine cooling fan. The noise of the fan is expressed as the discrete frequency noise peaks at the BPF and its harmonics and line spectrum at the broad band by noise generation mechanisms. The object of this paper is to find the optimal design for noise reduction of the engine cooling fan. We firstly show a comparison of the measured and calculated noise spectra of the fan for the validation of the noise prediction program. Orthogonal array is applied as design of experiments because it is suitable for Kriging. With these simulated data, we can estimate a correlation parameter of Kriging by solving the nonlinear problem with genetic algorithm and find an optimal level for the noise reduction of the cooling fan by optimizing Kriging estimates with simulated annealing. We notice that this optimal design scheme gives noticeable results. Therefore, an optimal design for the cooling fan is proposed by reducing the noise of its system.
Design and Control of Haptic Cue Device for Accelerator Pedal Using MR Brake
Noh, Kyung-Wook ; Han, Young-Min ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 516~522
DOI : 10.5050/KSNVN.2009.19.5.516
This paper proposes a new haptic cue vehicle accelerator pedal device using magnetorheological(MR) brake. As a first step, an MR fluid-based haptic cue device is devised to be capable of rotary motion of accelerator pedal. Under consideration of spatial limitation, design parameters are optimally determined to maximize control torque using finite element method. The proposed haptic cue device is then manufactured and integrated with accelerator pedal. Its field-dependant torque is experimentally evaluated. Vehicle system emulating gear shifting and engine speed is constructed in virtual environment and communicated with the haptic cue device. Haptic cue algorithm using the feed-forward control algorithm is formulated to achieve optimal gear shifting in driving. Control performances are experimentally evaluated via feed-forward control strategy and presented in time domain.
Smart Sensor for Machine Condition Monitoring Using Wireless LAN
Tae, Sung-Do ; Son, Jong-Duk ; Yang, Bo-Suk ; Kim, Dong-Hyen ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 523~529
DOI : 10.5050/KSNVN.2009.19.5.523
Smart sensor is known as intelligent sensor, it is different with other conventional sensors in the case of intelligent system embedded on it. Smart sensor has many benefits e.g. low-cost in usage, self-decision and self-diagnosis abilities. This sensor consists of perception element(sensing element), signal processing and technology of communication. In this work, a bridge and structure of smart sensor has been investigated to be capable to condition monitoring routine. This investigation involves low power consumption, software programming, fast data acquisition ability, and authoritativeness warranty. Moreover, this work also develops smart sensor to be capable to perform high sampling rate, high resolution of ADC, high memory capacity, and good communication for data transfer. The result shows that the developed smart sensor is promising to be applied to various industrial fields.
Power Flow Analysis of Vibration of a Plate Covered with a Damping Sheet
Lee, Jin-Young ; Kil, Hyun-Gwon ; Song, Jee-Hun ; Hong, Suk-Yoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 530~536
DOI : 10.5050/KSNVN.2009.19.5.530
In this paper, the power flow analysis(PFA) has been used to analyze the vibration of a plate covered with a damping sheet. Experiments have been performed to measure the loss factor and frequency response functions of the plate covered with the damping sheet. The data for the loss factor has been used as the input data to predict the vibration of the coupled plates with PFA. The comparison between the experimental results and the predicted PFA results for the frequency response functions has been performed. It showed that PFA can be effectively used to predict structural vibration of a plate covered with a damping sheet in medium-to-high frequency range.
Semi-finite Element Analysis of Rotating Disks Reinforced at Rim
Koo, Kyo-Nam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 5, 2009, Pages 537~544
DOI : 10.5050/KSNVN.2009.19.5.537
In order to increase the critical speed of rotating disks of which functional material could not be changed such as in optical and magnetic data storage disks, a new disk with a rim reinforced by composite material is proposed and its concept is verified by numerical analysis. Stress distributions are found for the rotating disk composed of two annular disks of which materials are isotropic inside and orthotropic outside. Dynamic equation is formulated in order to calculate the natural frequency and critical speed. For the solution of lateral vibration, a rotational symmertry condition is applied along circumferential direction and a finite element interpolation with Hermite polynomial is performed along the radial direction to obtain a proper solution. According to the results, reinforcing a disk at rim makes critical speeds drastically increased, and induces a buckling phenomenon in mode (0,0) which occurs over the lowest critical speed.