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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 18, Issue 12 - Dec 2008
Volume 18, Issue 11 - Nov 2008
Volume 18, Issue 10 - Oct 2008
Volume 18, Issue 9 - Sep 2008
Volume 18, Issue 8 - Aug 2008
Volume 18, Issue 7 - Jul 2008
Volume 18, Issue 6 - Jun 2008
Volume 18, Issue 5 - May 2008
Volume 18, Issue 4 - Apr 2008
Volume 18, Issue 3 - Mar 2008
Volume 18, Issue 2 - Feb 2008
Volume 18, Issue 1 - Jan 2008
Selecting the target year
Location Issue of Bearing and Unbalance Mass on the Balance Shaft for a Inline 4-Cylinder Engine
Bae, Chul-Yong ; Kim, Chan-Jung ; Lee, Dong-Won ; Kwon, Seong-Jin ; Lee, Bong-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 277~283
DOI : 10.5050/KSNVN.2008.18.3.277
Balance shaft module contributes to reduce the engine-born vibration by compensating it from a unbalance mass with opposite phase but practically, this device has some problems during the operation in a high speed owing to the considerable amount of unbalance mass that leads to the large quantity of bending deformation as well as torque fluctuation at the balance shaft. To tackle two main problems, the design strategy on balance shaft is suggested by addressing the optimal location of unbalance mass and supporting hearing based on the formulation of objective function that minimizes critical issues, both bending deformation as well as torque fluctuation. The boundary condition of balance shaft assumes to be free such that any external force or contact component is not taken into consideration in this study.
Performance Improvement of Active Noise Control Using Co-FXLMS Algorithm
Kwon, O-Cheol ; Lee, Gyeong-Tae ; Park, Sang-Gil ; Lee, Jung-Youn ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 284~292
DOI : 10.5050/KSNVN.2008.18.3.284
The active control technique mostly uses the least-mean-square(LMS) algorithm, because the LMS algorithm can easily obtain the complex transfer function in real-time, particularly when the Filtered-X LMS(FXLMS) algorithm is applied to an active noise control(ANC) system. However, FXLMS algorithm has the demerit that stability of the control is decreased when the step size become larger but the convergence speed is faster because the step size of FXLMS algorithm is fixed. As a result, the system has higher probability which the divergence occurs. Thus the Co-FXLMS algorithm was developed to solve this problem. The Co-FXLMS algorithm is realized by using an estimate of the cross correlation between the adaptation error and the filtered input signal to control the step size. In this paper, the performance of the Co-FXLMS algorithm is presented in comparison with the FXLMS algorithm. Simulation and experimental results show that active noise control using Co-FXLMS is effective in reducing the noise in duct system.
Non-contact Longitudinal Modal Testing of a Non-ferromagnetic Pipe Using Magnetostrictive Patches
Park, Chan-Il ; Han, Soon-Woo ; Kim, Yoon-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 293~298
DOI : 10.5050/KSNVN.2008.18.3.293
Non-contact modal testing for longitudinal modes of a pipe is discussed in this work. The suggested method can generate and measure longitudinal vibrations without mechanical contact by using the coupling phenomenon between deformation and magnetic field, known as the magnetostrictive effect. This effect has been used to generate and measure ultrasonic waves, but seldom used to deal with audible vibrations. In this investigation, the validity of the developed method in a typical vibration frequency range is checked with an Inconel pipe being used in nuclear power plants.
Effects of Guideway's Vibration Characteristics on Dynamics of a Maglev Vehicle
Han, Hyung-Suk ; Yim, Bong-Hyuk ; Lee, Nam-Jin ; Hur, Young-Chul ; Kwon, Jung-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 299~306
DOI : 10.5050/KSNVN.2008.18.3.299
The electromagnet in Maglev vehicles controls the voltage in its winding to maintain the air gap, a clearance between the electromagnet and guideway, within an allowable deviation, with strongly interacting with the flexible guideway. Thus, the vibration characteristics of guideway plays important role in dynamics of Maglev vehicles using electromagnet as an active suspension system. The effects of the guideway's vibrational characteristics on dynamics of the Maglev vehicle UTM-01 are analyzed. The coupled equations of motion of the vehicle/guideway with 3 DOFs are derived. Eigenvalues are calculated and frequency response analysis is also performed for a clear understanding of the dynamic characteristics due to guideway vibration characteristics. To verify the results, tests of the urban Mgalev vehicle UTM-02 are carried out. It is recommended that the natural frequency of the guideway be minimized and its damping ratio in the Maglev vehicle with a 5-states feedback control law as a levitation control law.
Controllable Haptic Knob for Vehicle Instrument Using MR Fluids
Kim, Chan-Jung ; Han, Young-Min ; Sung, Kum-Gil ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 307~314
DOI : 10.5050/KSNVN.2008.18.3.307
The paper presents control performance of a magnetorheological(MR) fluid-based haptic knob which is applicable to in-vehicle comfort functions. As a first step, MR fluid-based haptic knob is devised to be capable of both rotary and push motions with a single device. Under consideration of spatial limitation, design parameters are optimally determined to minimize a reciprocal of control torque using finite element analysis. The proposed haptic knob is then manufactured and its field-dependent torque is experimentally evaluated. Subsequently, in-vehicle comfort functions are constructed in virtual environment and make them communicate with the haptic knob. Control performances such as reflection force are experimentally evaluated via simple feed-forward control strategy.
Vibration Control of MR Suspension System Considering Damping Force Hysteresis
Seong, Min-Sang ; Sung, Kum-Gil ; Han, Young-Min ; Choi, Seung-Bok ; Lee, Ho-Guen ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 315~322
DOI : 10.5050/KSNVN.2008.18.3.315
This paper presents vibration control performances of a commercial magnetorheological(MR) suspension via new control strategy considering hysteresis of the field-dependent damping force of MR damper. A commercial MR damper which is applicable to high class passenger vehicle is adopted and its field-dependent damping force is experimentally evaluated. Preisach hysteresis model for the MR damper is identified using experimental first order descending(FOD) curves. Then, a feed-forward compensation strategy for the MR damper is formulated and integrated with a linear quadratic regulation(LQR) feedback controller for the suspension system. Control performances of the proposed control strategy for the MR suspension is experimentally evaluated with quarter vehicle test facility.
Evaluation of the Acceleration-factor and Analysis of the Vibration Fatigue for the Connection-pipe to the Compressor under the Random Vibration
Han, Hyung-Suk ; Jung, Woo-Seoung ; Yoon, Kyung-Jong ; Mo, Jin-Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 323~334
DOI : 10.5050/KSNVN.2008.18.3.323
According to the delivery condition, the breakage of a product occurs when it is delivered to the customers. Therefore product's makers evaluate the durability under the delivery process by accelerated life testing. In order to conduct this accelerated life testing accurately, it is very important to identify the acceleration-factor exactly between on-road and accelerated life test condition. In this paper, the acceleration-factor is identified by applying linear damage summation law, rain-flow cycle counting and Dirlik theory under the conditions of the random vibration. And approximated FEM model of the connecting-pipe to the compressor is developed for fatigue analysis. This model is finally verified by comparing the experiment results to the numerical analysis results.
Jury Evaluation Test for Annoyance Response of KTX(Korea Train Express) and Ordinary Train Noise
Chun, Hyung-Joon ; Kim, Deuk-Sung ; Ko, Joon-Hee ; Chang, Seo-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 335~344
DOI : 10.5050/KSNVN.2008.18.3.335
In recent years, public complaints against railroad noise by KTX and Ordinary train have been rising. Regulation of railways noise uses same standard without distinguishing the type of railroad cars. According to the type of railroad cars, the frequency characteristics of emitting noise is different. Therefore it is requested to know how the public response vary to each types of railroad cars. The noise annoyance from three types of trains(KTX, electric train, diesel train) was analyzed by jury evaluation test for assessing the effect of frequency characteristics. The numerical results by a semantic differential method showed that annoyance response to three type of trains depended on the frequency characteristics. As a result, this study proposed that the KTX could have a bonus level of maximum 2.9 dB(A) compared to ordinary train.
A Tuned Liquid Mass Damper(TLMD) for Controlling Bi-directional Responses of a Building Structure
Heo, Jae-Sung ; Park, Eun-Churn ; Lee, Sang-Hyun ; Lee, Sung-Kyung ; Kim, Hong-Jin ; Cho, Bong-Ho ; Jo, Ji-Seong ; Kim, Dong-Young ; Min, Kyung-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 345~355
DOI : 10.5050/KSNVN.2008.18.3.345
This paper presents a design of a tuned liquid mass damper(TLMD) for controlling bi-directional response of high-rise building structure subjected to windload. The proposed damper behaves as a tuned mass damper(TMD) of which mass is regarded as the mass of a tuned liquid column damper(TLCD) and the case wall of the TLCD itself in one direction and the TLCD in the other direction. Because the proposed device has coupled design parameter along two orthogonal directions, it is very important to select designing components by optimal fine tuning. In the designing TLMD, for easy maintenance, the rubber-bearing with small springs was applied in TMD direction. In this study, the Songdo New City Tower 1A in Korea, which has been designed and constructed two TLCDs in order to control bi-directional response, was chosen as the model building structure. The results of rotation test proved the effectiveness of bi-directional behavior of TLMD.
Investigation of Natural Modes of Moduled Floating Structure Considering Unit Size and Connector Stiffness
Kim, Byoung-Wan ; Hong, Sa-Young ; Kyoung, Jo-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 356~360
DOI : 10.5050/KSNVN.2008.18.3.356
This paper investigates the natural modes of moduled floating structure with module unit connector. As an example structure, a floating parking place(
) is considered. In the evaluation of natural modes, numerical equations are formulated by FEM(finite element method) and the natural modes are solved by the subspace iteration method. By comparing results for various sizes of module unit, the effect of unit size is investigated. By comparing results for various stiffness of module unit connector, the effect of stiffness of unit connector is also examined.
New Learning Hybrid Model for Room Impulse Response Functions
Shin, Min-Cheol ; Wang, Se-Myung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 361~367
DOI : 10.5050/KSNVN.2008.18.3.361
Many trials have been used to model room impulse responses, all attempting to provide efficient representations of room acoustics. The traditional model designs for room impulse response seem to fail in accuracy, controllability, or computational efficiency. In the time domain, room impulse responses are generally considered as combination of the three Parts having different acoustic characteristics, initial time delay, early reflection, and late reverberation. This paper introduces new learning hybrid model for room impulse responses. In this proposed model, those three parts are modeled using different models with learning algorithms that determine the boundary of each model in the hybrid model. By the simulation with measured room impulse responses, the performance of proposed model shows the best efficiency in views of computational burden and modeling error.
Signal Processing for Multiaxial Vibration Fatigue Test on Vehicle Component
Bae, Chul-Yong ; Kim, Chan-Jung ; Lee, Dong-Won ; Lee, Bong-Hyun ; Na, Byung-Chul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 3, 2008, Pages 368~374
DOI : 10.5050/KSNVN.2008.18.3.368
Multi-axial simulation table(MAST) is widely used in motor companies as the multi-axial excitor for vibration fatigue of target component, which provides the vibrational condition as close as the vehicle test. However, the vibration fatigue performance of target component can be guaranteed with MAST system only in case the input profile covers the required severity of the target component on field test. In this paper, the signal processing for multi-axial vibration fatigue test on vehicle component is presented, from the data acquisition of the target component to the derivation of input profile. To compare the severity of vibration condition between field and proving ground, the energy principle of a equivalent damage is proposed and then, it is determined the optimal combination of special events on proving ground using a sequential searching optimal algorithm. To explain the vibration methodology clearly, seat and door component of vehicle are selected as a example.