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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
A Comparative Study on the Noise Exposed Population for Noise Map Types
Park, In Sun ; Park, Jae Sik ; Park, Sang Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 99~104
DOI : 10.5050/KSNVE.2013.23.2.099
Assessment of noise exposed population is to check the environmental noise level and social influence in order to reduce the risks such as annoyance and disturbance that are generated by environmental noise. Also, this method suggests the preferential noise abatement policy and action plan by accurately finding the area that the noise causes harmful effect to human health. Recently, a noise map, which can predict noise in comprehensive areas, is used for the assessment of noise exposed population, breaking from the methods using existing measures. In particular, countermeasure for the noise can be considered more effectively by using assessment methods of noise exposed population for specific noise levels, areas, and building types which are the main input factors in noise maps. In this study, assessment methods of noise exposed population by using 2 dimensional noise map are compared with those by 3 dimensional noise map.
Dynamic Characteristic Study of Hingeless Blade Stiffness Reinforcement for Bearingless Rotor Whirl Tower Test
Kim, Taejoo ; Yun, Chulyong ; Kee, Youngjoong ; Kim, Seung-Ho ; Jung, Sungnam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 105~111
DOI : 10.5050/KSNVE.2013.23.2.105
Whirl tower test is conducted basically during helicopter rotor system development process. And for whirl tower test of rotor hub system, new design blade or existing blade which is remodeled for new rotor hub system is used. Because of simple shape and efficient aerodynamic characteristic, BO-105 helicopter blade is used for helicopter rotor hub development project widely. Originally BO-105 blade is used for hingeless hub system and blade root is used to flexure. So flap stiffness and lag stiffness at blade root area is relatively low compare with airfoil area. So, in order to apply the BO-105 blade to bearingless hub, blade root area have to be reinforced. And in this process, blade root area`s section property is changed. In this paper, we suggest reinforcement method of BO-105 blade root area and study dynamic characteristic of bearingless rotor system with reinforcement BO-105 blade.
The Development of a Floating Slab Track to Isolation System
Park, Sang Gon ; Chun, Chong Keun ; Lee, Gyu Seop ; Jang, Seung Yup ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 112~122
DOI : 10.5050/KSNVE.2013.23.2.112
Recently the construction of stations under railway lines and railway sections passing through central area of cities are increasing, calling for an urgent establishment of countermeasures against railway vibration and its subsequent second-phase noise. Of technology developed up to now, the most efficient countermeasure is the floating slab track, a track system isolated from the sub-structure by springs. Unfortunately, however, the system design technology and technology for key components have not yet developed in Korea. As such, in this study, the analysis and design technology of floating slab track and its vibration isolator technology can be achieved. In preparation for future demands, it is expected to raise awareness for the need of technology self-support and to make a meaningful contribution to mitigating vibration and noise produced by the next-generation high-speed railway.
Reduction of Vibration Responses of a Bridge due to Vehicles
Lee, Gun-Myung ; Ju, Young-Ho ; Park, Mun-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 123~130
DOI : 10.5050/KSNVE.2013.23.2.123
The responses of a bridge due to a moving vehicle are obtained analytically by modeling a vehicle as a constant point force. From the results it is found that the responses after a vehicle leaves the bridge become very small for some speeds of a vehicle. When a vehicle is modeled as a two dof system for a more accurate analysis, the same phenomenon is observed while the roughness of the surface of the bridge is small. Determining the fundamental frequency of a bridge so that one of the above speeds coincides with a frequent speed of vehicles, the responses of a bridge can be minimized.
Condition Monitoring of Low Speed Slewing Bearings Based on Ensemble Empirical Mode Decomposition Method
Caesarendra, W. ; Park, J.H. ; Kosasih, P.B. ; Choi, B.K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 131~143
DOI : 10.5050/KSNVE.2013.23.2.131
Vibration condition monitoring of low-speed rotational slewing bearings is essential ever since it became necessary for a proper maintenance schedule that replaces the slewing bearings installed in massive machinery in the steel industry, among other applications. So far, acoustic emission(AE) is still the primary technique used for dealing with low-speed bearing cases. Few studies employed vibration analysis because the signal generated as a result of the impact between the rolling element and the natural defect spots at low rotational speeds is generally weak and sometimes buried in noise and other interference frequencies. In order to increase the impact energy, some researchers generate artificial defects with a predetermined length, width, and depth of crack on the inner or outer race surfaces. Consequently, the fault frequency of a particular fault is easy to identify. This paper presents the applications of empirical mode decomposition(EMD) and ensemble empirical mode decomposition(EEMD) for measuring vibration signals slewing bearings running at a low rotational speed of 15 rpm. The natural vibration damage data used in this paper are obtained from a Korean industrial company. In this study, EEMD is used to support and clarify the results of the fast Fourier transform(FFT) in identifying bearing fault frequencies.
Electrical Characteristics and Electromagnetic Excitation Force Comparison of PM Motor according to the Driving method
Lee, Su-Jin ; Kim, Do-Jin ; Lee, Byeong-Hwa ; Hong, Jung-Pyo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 144~151
DOI : 10.5050/KSNVE.2013.23.2.144
This paper presents a result of the mechanical noise and vibration analysis as well as the electrical characteristics analysis of the permanent magnet(PM) motor according to the driving method that is Brushless DC(BLDC) drive and Brushless AC(BLAC) drive. To do that, the characteristics of the PM motor, which have the same output power but different driving method, are investigated. At that time, the characteristics such as torque, torque ripple and flux density, and so on, are obtained by finite element analysis(FEA). Besides, noise and vibration are obtained by spectrum analysis. The magnetic noise is defined as noise generated from vibrations due to electromagnetic excitation force. In this paper, the electromagnetic excitation force is analyzed and design process of noise reduction is proposed. Finally, The validity of the analysis results is verified by test.
Impact Localization of a Composite Plate Using a Single Transducer and Spatial Focusing Signal Processing Techniques
Cho, Sungjong ; Jeong, Hyunjo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 152~159
DOI : 10.5050/KSNVE.2013.23.2.152
A structural health monitoring(SHM) technique for locating impact position in a composite plate is presented in this paper. The technique employs a single sensor and spatial focusing properties of time reversal(TR) and inverse filtering(IF). We first examine the focusing effect of back-propagated signal at the impact position and its surroundings through simulation. Impact experiments are then carried out and the localization images are found using the TR and IF signal processing, respectively. Both techniques provide accurate impact location results. Compared to existing techniques for locating impact or acoustic emission source, the proposed methods have the benefits of using a single sensor and not requiring knowledge of material properties and geometry of structures. Furthermore, it does not depend on a particular mode of dispersive Lamb waves that is frequently used in the SHM of plate-like structures.
Performance Evaluation of Vehicle Gear-shifting Supportive Device Utilizing MR Haptic Cue
Han, Young-Min ; Min, Chul-Gi ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 160~166
DOI : 10.5050/KSNVE.2013.23.2.160
This paper proposes a driver supportive device with haptic cue function which can be applicable for vehicles adopting manual transmission system to transmit gear-shifting information to a driver by kinesthetic forces. This haptic cue function is implemented on accelerator pedal by utilizing magnetorheological(MR) fluid and clutch mechanism. In order to achieve this goal, an MR clutch mechanism is devised to be capable of rotary motion of accelerator pedal. The proposed MR clutch is then optimally designed and manufactured under consideration of spatial limitation of vehicles. After transmission torque is experimentally evaluated according to field intensity. The manufactured MR clutch is integrated with accelerator pedal and electric motor to establish the haptic cue device. Control performances are experimentally evaluated via a simple feed-forward control algorithm.
Wave Propagation Characteristics of Acoustic Metamaterials with Helmholtz Resonators
Kwon, Byung-Jin ; Jo, Choonghee ; Park, Kwang-Chun ; Oh, Il-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 167~175
DOI : 10.5050/KSNVE.2013.23.2.167
The wave propagation characteristics of an acoustic metamaterial composed of periodically repeated one-dimensional Helmholtz resonator array was investigated considering the effects of dimensional changes of the resonator geometry on the transmission coefficient and band gap. The effective impedance and transmission coefficient of the acoustic metamaterials are obtained based on the acoustic transmission line method. The designed acoustic metamaterials exhibit band gaps and negative bulk modulus that are non-existent properties in the nature. The band gap of the acoustic metamaterial is strongly dependent on the geometry parameters of Helmholtz resonators and lattice spacing. Also, a new type of metamaterial that is periodically constructed with two different resonators was designed to open the local resonance band gap without change of Bragg scattering.
Road Noise Estimation Based on Transfer Path Analysis Using a Simplified Tire Vibration Transfer Model
Shin, Taejin ; Park, Jongho ; Lee, Sangkwon ; Shin, Gwangsoo ; Hwang, Sungwook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 2, 2013, Pages 176~184
DOI : 10.5050/KSNVE.2013.23.2.176
Quantification of road noise is a challenging issue in the development of tire noise since its transfer paths are complicated. In this paper, a simplified model to estimate the road noise is developed. Transfer path of the model is from wheel to interior. The method uses the wheel excitation force estimated throughout inverse method. In inversion procedure, the Tikhonov regularization method is used to reduce the inversion error. To estimate the wheel excitation force, the vibration of knuckle is measured and transfer function between knuckle and wheel center is also measured. The wheel excitation force is estimated by using the measured knuckle vibration and the inversed transfer function. Finally interior noise due to wheel force is estimated by multiplying wheel excitation force in the vibro-acoustic transfer function. This vibro-acoustic transfer function is obtained throughout measurement. The proposed method is validated by using cleat excitation method. Finally, it is applied to the estimation of interior noise of the vehicle with different types of tires during driving test.
Roller Design of IRB Seismic Isolation Device Using Testing Evaluation : Part I. Geometry Dimension and Crowning
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 2, 2013, Pages 185~191
DOI : 10.5050/KSNVE.2013.23.2.185
This paper presents a new method for roller design of IRB(isolation roller bearing) seismic isolation device using experimental evaluation. Three layered plate is adopted for the IRB in which the upper plate is placed on x direction and the lower plate is placed on y direction. The rollers placed in each plate make a plate movement. The roller is then optimally designed using variable geometric conditions. Stress distribution depends on the diameter and length of the roller and hence this is used for the determination of optimal geometry of the roller. In the experimental evaluation, it is observed that stress concentration at the end sides of roller is decreased and geometric coefficients depend on crowning dimension. In addition, in order to determine optimal design parameters of the roller the plastic deformation and friction are experimentally identified.