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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 22, Issue 12 - Dec 2012
Volume 22, Issue 11 - Nov 2012
Volume 22, Issue 10 - Oct 2012
Volume 22, Issue 9 - Sep 2012
Volume 22, Issue 8 - Aug 2012
Volume 22, Issue 7 - Jul 2012
Volume 22, Issue 6 - Jun 2012
Volume 22, Issue 5 - May 2012
Volume 22, Issue 4 - Apr 2012
Volume 22, Issue 3 - Mar 2012
Volume 22, Issue 2 - Feb 2012
Volume 22, Issue 1 - Jan 2012
Selecting the target year
Dynamic Analysis for Improvement of Running Stability of Rubber Tired AGT Localization Bogie
Eom, Beom-Gyu ; Lee, Hi-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 307~317
DOI : 10.5050/KSNVE.2012.22.4.307
The LRT(light rail transit) system, which has medium transport capacity between subway and bus is an advanced transportation system. It has many benefits like chap construction and operational cost down through driverless and flexible route planning. The rubber tired AGT(K-AGT) is a kind of LRT, which has rubber wheels and side guides. The side guides has many advantages, but brings vibration and noise problems from the friction between the guide rail and the wheels. This is the major source for the of passengers' discomfort. The purpose of this paper is to analyze dynamic characteries and running stability of the rubber tired AGT localization bogie if the AGT's speed is increased from 70 km/h to 80 km/h. The current design parameters of bogie suspension, as it is designed, was examined to satisfy the comfort index of the railway vehicle in performance test.
Tonality Design for Sound Quality Evaluation in Printer
Kim, Eui-Youl ; Lee, Young-Jun ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 318~327
DOI : 10.5050/KSNVE.2012.22.4.318
The operating sound radiated from a laser printer includes tonal noise components caused by the rotating mechanical parts such as gear, shaft, motor, fan, etc. The negative effects of the tonal noise components need to be considered in the process of developing a sound quality index for the quantitative evaluation of the emotional satisfaction in terms of psycho-acoustics. However, in a previous paper, it was confirmed that the Aures tonality did not have enough correlation with the results of jury evaluation. The sound quality index based on loudness, articulation index, fluctuation strength has a little problem in considering the effects of rotating mechanical parts on the sound quality. In this paper, to solve the tonality evaluation problem, the calculation algorithm of Aures tonality was investigated in detail to find the cause of decreasing the correlation. The new tonality evaluation model was proposed by modifying and optimizing the masking effect, loudness ratio, and shape of weighting curve based on the basic algorithm of Aures tonality, and applied to two kinds of operating sound groups in order to verify the usefulness of proposed model. As a result, it is confirmed that the proposed tonality evaluation model has enough correlation and usefulness for expressing the tonalness in the operating sounds of laser printers. In the following paper, this results will be used to model the sound quality index as the input data by using the classification algorithm.
Underwater Radiated Noise Analysis for An Unmanned Underwater Vehicle Using Power Flow Analysis
Kwon, Hyun-Wung ; Hong, Suk-Yoon ; Lee, Sang-Young ; Hwang, A-Rom ; Song, Jee-Hun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 328~334
DOI : 10.5050/KSNVE.2012.22.4.328
Power flow finite element method(PFFEM) combining power flow analysis(PFA) with finite element method is efficient for vibration analysis of a built-up structure, and power flow boundary element method(PFBEM) combining PFA with boundary element method is useful for predicting the noise level of a vibrating complex structure. In this paper, the coupled PFFE/PFBE method is used to investigate the vibration and radiated noise of the unmanned underwater vehicle(UUV) in water. PFFEM is employed to analyze the vibrational responses of the UUV, and PFBEM is applied to analyze the underwater radiation noise. The vibrational energy of the structure is treated as an acoustic intensity boundary condition of PFBEM to calculate underwater radiation noise. Numerical simulations are presented for the UUV in water, and reliable results have been obtained.
Reduction of Structure-borne Idle Noise with the Insertion of a Composite Body inside Vehicle Body Skeleton
Kim, Hyo-Sig ; Kim, Joong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 335~343
DOI : 10.5050/KSNVE.2012.22.4.335
As a matter of fact, it has been not allowed to modify the shape of a vehicle body skeleton since the technical definition for the structure was fixed and the corresponding molds were developed. By the way, if it is available to apply an alternative to reinforce the skeleton without changing its mold, it must be much flexible to improve the performance qualities relevant to not only NVH(noise, vibration and harshness) but also crash and durability. Recently, a solution of so-called composite body becomes available for the need. We present a design method to insert the composite body inside a vehicle body skeleton in order to improve a structure-borne noise at the idle condition. The algorithms, topology optimization and design sensitivity analysis, are applied to mainly search the sensitive structural sections in the body skeleton and to extract the target stiffness of the sections. Inserting the composite bodies into the sensitive portions, it is predicted to achieve the countermeasures which can compromize the design availability in terms of the idle noise and weight. According to the validation result with test vehicles, the concerned noise transfer function is reduced and the idle booming noise is resultantly improved.
Prediction of Load-displacement of the Disc Spring with the Friction
Shin, Dong-Ho ; Lee, Jung-Youn ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 344~351
DOI : 10.5050/KSNVE.2012.22.4.344
A disc spring consists of a conical disc. A load-displacement formula was newly developed in the form of energy method to consider both rigid and friction. The cross section of the disc spring has identical slope angles at the bottom of conical. To solve such a problem, an energy method calculation is proposed. To achieve the goal of this study, the proposed calculation is extended to a disc spring with friction. A firm basis background study based on Almen's work is presented in developing a new numerical approach to predict the available formulation for a disc spring with friction.
Ground Resonance Instabilities Analysis of a Bearingless Helicopter Main Rotor
Yun, Chul-Yong ; Kee, Young-Jung ; Kim, Tae-Joo ; Kim, Deog-Kwan ; Kim, Seung-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 352~357
DOI : 10.5050/KSNVE.2012.22.4.352
The ground resonance instability of a helicopter with bearingless main rotor hub were investigated. The ground resonance instability is caused by an interaction between the blade lag motion and hub inplane motion. This instability occurs when the helicopter is on the ground and is important for soft-inplane rotors where the rotating lag mode frequency is less than the rotor rotational speed. For the analysis, the bearingless rotor was composed of blades, flexbeam, torque tube, damper, shear restrainer, and pitch links. The fuselage was modeled as a mass-damper-spring system having natural frequencies in roll and pitch motions. The rotor-fuselage coupling equations are derived in non-rotating frame to consider the rotor and fuselage equations in the same frame. The ground resonance instabilities for three cases where are without lead-lag damper and fuselage damping, with lead-lag damper and without fuselage damping, and finally with lead-lag damper and fuselage damping. There is no ground resonance instability in the only rotor-fuselage configuration with lead-lag damper and fuselage damping.
Comparison of Dynamic Characteristics of Spur Gears and Helical Gears
Park, Chan-Il ; Cho, Do-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 358~364
DOI : 10.5050/KSNVE.2012.22.4.358
This work dealt with dynamic characteristics of spur gear and helical gear system to understand the gear vibration and noise. To find out dynamic characteristics in the gear system, a finite element model and an analytic model for the gear system were used. Using the models, the natural frequency and mode-shape characteristics of spur gears and helical gears were calculated. Two models show that natural frequencies of helical gears were lower than those of spur gears. Mode-shape characteristics of gear pairs by analytical model and some issues of finite element modeling were also discussed. Impact test was used to validate the finite element model.
Design and Speed Control of ER Brake System Using GER Fluids
Yook, J.Y. ; Choi, S.B. ; Yook, W.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 365~371
DOI : 10.5050/KSNVE.2012.22.4.365
This paper presents robust control performance of a direct current(DC) motor with brake system adopting a giant electrorheological(GER) fluid, whose distinguished feature is an extremely high value of yield stress. As a first step, Bingham characteristics of the GER fluid is experimentally investigated using the Couette type electroviscometer. A cylindrical type of ER brake is then devised based on the Bingham model, and its braking torque is evaluated. Structural analysis of ER break is performed using ANSYS. After formulating the governing equation of motion for the DC motor with ER brake system, a sliding mode control algorithm, which is very robust to external disturbances and parameter uncertainties, is synthesized and experimentally realized in order to achieve desired rotational speed trajectories. The tracking responses of the control system are then evaluated and verified by presenting speed control performance.
Use of High Order Vibration Modes for Design of Piezo Energy Harvester
Hwang, Woo-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 372~376
DOI : 10.5050/KSNVE.2012.22.4.372
The most common type of the piezoelectric energy harvester is the cantilevered beam since it is attached to the host structure and tuned to the frequency of the base excitation easily. However, the excessive strain at the fixed end of cantilevered beam causes some problems such as fatigue and durability. The use of higher vibration modes of the cantilevered beam may reduce the concentration of the strain at the fixed end since the strains of higher modes are distributed along the span. The results show that the use of high vibration mode is not efficient for power generation, but it reduces the excessive strain lever at typical region to prevent the failure by fatigue.
Evaluation of Torsional Vibration Isolation Damper in Automotive Transmissions Based on In-situ Torque Measurement
Kim, Gi-Woo ; Jang, Jae-Duk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 377~382
DOI : 10.5050/KSNVE.2012.22.4.377
This paper presents a proof-of-concept study on the evaluation of torsional vibration isolation performance through in-situ output torque measurement by using a non-contacting magneto-elastic torque transducer installed in the vehicle driveline system. The de-trending processing is first conducted to extract the torsional vibration from the measured driveline output torque. In order to estimate the transmissibility, primary performance indicator of a vibration isolator, the magnitude of transmitted torsional vibration with different frequencies is compared. From the conservative estimation results, the torsional damper built in a lock-up clutch of a torque converter is identified to be a vibration isolator. The evaluation results show that the fluid damping by torque converter outperforms the vibration isolation function of a torsional damper, and the isolation performance needs to be enhanced.
Positive Position Feedback Control of Plate Vibrations Using Moment Pair Actuators
Shin, Chang-Joo ; Hong, Chin-Suk ; Jeong, Weui-Bong ; You, Ho-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 383~392
DOI : 10.5050/KSNVE.2012.22.4.383
This paper reports the active vibration control of plates using a positive position feedback(PPF) controller with moment pair actuators. The equations of motion of the plates under a force and moment pairs are derived and the equations of PPF controllers are formulated. The numerical active control system is then achieved. The effect of the parameters - gain and damping ratio - of the PPF controllers on the open loop transfer function was investigated mainly in terms of the system stability. Increasing the gain of the PPF controller tuned at a mode, the magnitude of the open loop transfer function is increased at all frequencies without changing the phase behavior. The increase of the damping ratio of the PPF controller leads to decrease the magnitude of the open loop transfer function and to modify its phase characteristics, ie, system stability. Based on the behavior of the gain and the damping ratio of the controller, PPF controller for reduction of the plate vibration can be achieved. Two PPF controllers are designed with their connection in parallel to control the two modes simultaneously. Each PPF controller is tuned at the
modes, respectively. Their parameters were determined to remain the system to be stable based on the results of the parametric study. A significant reduction in vibration at the tuned modes can be obtained.
Flutter Experiment Equipment Design with Compliant Mechanism
Lee, Ju-Ho ; Lee, Jun-Seong ; Sung, Yeol-Hun ; Han, Jae-Hung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 4, 2012, Pages 393~400
DOI : 10.5050/KSNVE.2012.22.4.393
This paper deals with a development of 2-DOF flutter experiment equipment which represents a 2-DOF typical section model. For a conventional 2-DOF flutter experiment equipment, it is hard to observe flutter boundary clearly due to the complexity of the experiment equipment. To refine our flutter experiment equipment system, a compliant mechanism based torsional spring is used. Well-designed extruded aluminum pipe works as a torsional spring. SolidWorks and ANSYS are used for modeling, analysis and design of the torsional spring. With this designed torsional spring, the 2-DOF flutter experiment equipment is developed and wind tunnel tests are performed. Clear flutter boundary which is estimated by classical flutter analysis is observed in the experiments.