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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 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
Selecting the target year
Vibration Control of Vehicle Suspension Featuring Magnetorheological Dampers : Road Test Evaluation
Sung, Kum-Gil ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 235~242
DOI : 10.5050/KSNVN.2009.19.3.235
This paper presents vehicle road test of a semi-active suspension system equipped with continuously controllable magnetorheological(MR) dampers. As a first step, front and rear MR dampers are designed and manufactured based on the optimized damping force levels and mechanical dimensions required for a commercial middle-sized passenger vehicle. After experimentally evaluating dynamic characteristics of the MR dampers, the test vehicle is prepared for road test by integrating current suppliers, real-time data acquisition system and numerous sensors such as accelerometer and gyroscope. Subsequently, the manufactured four MR dampers(two for front parts and two for rear parts) are incorporated with the test vehicle and a skyhook control algorithm is formulated and realized in the data acquisition system. In order to emphasize practical aspect of the proposed MR suspension system, road tests are undertaken on proving grounds: bump and paved roads. The control responses are evaluated in both time and frequency domains by activating the MR dampers.
An Investigation on the Effects of Clutch Disk Characteristics for a Passenger Car Driveline
Kim, Young-Heub ; Park, Dong-Hoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 243~250
DOI : 10.5050/KSNVN.2009.19.3.243
The clutch with torsional damper is installed on a passenger car with manual transmission, which not only transmits the power generated by engine to the transmission but also absorbs the shock and vibration from the engine. The torsional damper in the clutch dissipates the torsional vibration energy and eliminates the resonance in the driveline but high damping in the damper causes the increase of the vibration level which is against the comfort and durability. In this study, a dynamic model for the passenger car driveline with manual transmission was developed to investigate the vibration and the effects of characteristics of the driveline. With the dynamic model, the vibration characteristics of driveline were examined by the mode analysis and driving simulation, and the effects of hysteresis torque and spring constant were investigated. The vehicle tests with prototype torsional dampers were preformed and the test results showed good agreements with the simulation.
Noise Attenuation Effect According to the Direction of Secondary Sound Source in Duct ANC System
Lee, Eung-Suk ; Lee, Hyung-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 251~260
DOI : 10.5050/KSNVN.2009.19.3.251
In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in ANC system. Automobile exhaust noise was recorded at 800 rpm, 3500 rpm and 5000 rpm of a diesel engine. Directions of canceling speaker can be set to
against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board with TMS320C6416 chip of Texas Instrument Co. used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The
duct in the attenuation effect of noise showed a better result than the
Analysis of the Dynamic Behavior of a CNC Automatic Lathe Spindle System
Kim, T.J. ; Koo, J.H. ; Lee, S.B. ; Kim, M.S. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 261~267
DOI : 10.5050/KSNVN.2009.19.3.261
The spindle with a built-in motor can be used to simplify the structure of machine tool system, while the rotor has unbalance mass inevitably. Therefore, it is important to recognize the effect of unbalance mass. This paper presents analysis of dynamic behavior of a high speed spindle with a built-in motor. The spindle is supported by the angular contact ball bearings and the rotor is fixed at the middle of spindle. The spindle used in CNC automatic lathe has been investigated using combined methodologies of finite elements and transfer matrices. The Houbolt method is used for the integration of the system equations and the dynamic behavior of spindle is obtained considering unbalance mass of rotor. Results show that increasing rotational speed of spindle magnifies the whirl responses of spindle seriously. Also the whirl responses of spindle are affected by the other factors such as unbalance mass and bearing stiffness.
A Study on the Fault Detection of Auto-transmission Using the Vibrational Characteristics of Roller Bearings
Park, Ki-Ho ; Jung, Sang-Jin ; Wee, Hyuk ; Lee, Gook-Sun ; Cho, Seong-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 268~273
DOI : 10.5050/KSNVN.2009.19.3.268
The roller bearings play an important role not only sustain radial or axial load of system, but carry out a rotatory movement as a various operating conditions. They happen that incipient faults which were caused by excessive load, manufacturing or assembling process's errors and many other reasons are created. The bearing faults make noise and vibration by a continuous collision of rotatory components, which can lower the quality and stability of auto-transmission. Therefore, it is important to detect the early fault as soon as possible. This paper presents a detecting method for the improvement in quality by developing the program which can be used to analyze and predict the vibrational characteristics caused by roller bearing faults. We completed development of the inspection system of vibration by applying the most efficient detecting methods and verified the system's reliability through experiments.
A Study on Characteristics According to the Parameter Variation for Hybrid Shaft Design
Hong, Yong ; Kim, Hyun-Sik ; Hong, Dong-Pyo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 274~281
DOI : 10.5050/KSNVN.2009.19.3.274
The carbon fiber epoxy composite material and aluminum have many advantages over other materials because of their high specific stiffness and good fatigue characteristics. Basically, the propeller shaft of automobile requires bending frequency of higher than 2,700 Nm and high natural frequency of higher than 9,200 rpm occurred by fast revolution. For this reason, natural frequency and torsion torque characteristics of hybrid shaft was studied in variation of its outer-diameter and thickness. Vibration and torque characteristics of hybrid shaft were compared by torsion tester, natural frequency experiments and FE analysis. Designed hybrid shaft satisfied its vibration and torque characteristics when its outer-diameter was 60 mm and thickness was 5 mm. Therefore, hybrid material enables to manufacture one piece structure hybrid propeller shaft rather than current two piece structure.
Subjective Assessment of Simulated Heavy Floor Impact Sounds for Alternative Rating Method
Shin, Hoon ; Kim, Sun-Woo ; Jang, Gil-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 282~287
DOI : 10.5050/KSNVN.2009.19.3.282
This study aims to examine the existing single rating index in terms of level reduction limit of heavy-weight floor impact sound. To achieve this goal, sounds which have same loudness according to rating methods were suggested to subjects. And followings are results. 1) The rating method of measurement frequency level average is more suitable than that of other methods which are dependent on specific frequency for rating heavy-weight floor impact sound. 2) Level average for measurement frequency of
is more correspondent to psycho-acoustic response than that of measurement frequency of
which is for KS F 2863-2, existing rating method.
Active Noise Control in a Duct System Using the Hybrid Control Algorithm
Lee, You-Yub ; Park, Sang-Gil ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 288~293
DOI : 10.5050/KSNVN.2009.19.3.288
This study presents the active noise control of duct noise. The duct was excited by a steady-state harmonic and white noise force and the control was performed by one control speaker attached to surface of the duct. An adaptive controller based on filtered x LMS(FXLMS) algorithm was used and controller was defined by minimizing the square of the response of the error microphone. The assemble controller, which is called a hybrid ANC(active noise control) system, was combined with feedforward and feedback controller. The feedforward ANC attenuates primary noise that is correlated with the reference signal, while the feedback ANC cancels the narrowband components of the primary noise that are not observed by the reference sensor. Furthermore, in many ANC applications, the periodic components of noise are the most intense and the feedback ANC system has the effect of reducing the spectral peaks of the primary noise, thus easing the burden of the feedforward ANC filter.
Damping Estimation of Railway Bridges Using Extended Kalman Filter
Park, Dong-Uk ; Kim, Nam-Sik ; Kim, Sung-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 294~300
DOI : 10.5050/KSNVN.2009.19.3.294
In high speed railway bridges, dynamic analysis is important because of high passing velocity and moving load at the regular intervals, and damping ratio is a major parameter to predict dynamic responses. In this paper, damping ratios were estimated by using half power band width method and extended Kalman filter according to acceleration signal conditions, and a relationship between estimated damping ratios and representative values of bridge vibration was derived. From the results, damping ratios estimated from total ambient vibration were more reliable than only free vibration part. In case of using extended Kalman filter, the estimated damping ratios varying with RMQ(root mean quad), as one of representative values of bridge vibration, have more feasible trend. Thus, it is shown that further studies on reliabilities of estimated damping ratios are needed.
Resonance Characteristics of a 1-3 Piezoelectric Composite Transducer of Circular Arch Shape
Kim, Dae-Seung ; Kim, Jin-Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 301~312
DOI : 10.5050/KSNVN.2009.19.3.301
This paper presents a theoretical approach to calculate the resonant frequency of a thickness vibration mode in the radial direction for a 1-3 piezoelectric composite transducer of circular arch shape. For the composite transducer composed of a piezoelectric ceramic and a polymer, vibration parameters were derived according to the volume ratio of a ceramic, and a vibration characteristic equation was derived from the piezoelectric governing equations with adequate boundary conditions. The fundamental resonant frequencies were calculated numerically and verified by comparing them with those obtained from the finite element analysis and the experiment. The volume ratio and the thickness are more substantial than the curvature radius to determine the fundamental resonant characteristics, and the fundamental resonant frequency becomes higher for the larger volume ratio of the piezoelectric ceramic and for the smaller thickness.
Vibration Prediction and Charge Estimation in Hard Rock Blasting Site
Park, Yeon-Soo ; Park, Sun-Joon ; Choi, Sun-Min ; Mun, Soo-Bong ; Mun, Byeong-Ok ; Jeong, Gyung-Yul ; Jeong, Tae-Hyeong ; Hwang, Seung-Ill ; Kim, Min-Jung ; Park, Sang-Chul ; Kim, Jung-Ju ; Lee, Byeong-Geun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 313~319
DOI : 10.5050/KSNVN.2009.19.3.313
The blasting has a lot of economic efficiency and speediness but it can damage to a neighbor structure, a domestic animal and a cultured fish due to the blasting vibration, then the public grievance is increased. Therefore, we need to manage the blasting vibration efficiently. The prediction of the correct vibration velocity is not easy because there are lots of different kinds of the scale of blasting vibration and it has a number of a variable effect. So we figure the optimum line through the least-squares regression by using the vibration data measured in hard rock blasting and compared with the design vibration prediction equation. As a result, we confirm that the vibration estimated in this paper is bigger than the design vibration prediction equation in the same charge and distance. If there is a Gaussian normal distribution data on the left-right side of the least squares regression, then we can estimate the vibration prediction equation on reliability 50%(
). As a result, it appears to be suitable that the reliability is 99% at the transverse component, the reliability 95% is at the vertical component, the reliability 90% is at the longitudinal component and the reliability is 95% at the peak vector sum component.
Investigation for the Restriction of the Stiffness and Mechanical Impedance of the Shipboard Floor and Foundation Considering Dynamic Stiffness of the Anti-vibration Mount
Han, Hyung-Suk ; Son, Yoon-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 3, 2009, Pages 320~326
DOI : 10.5050/KSNVN.2009.19.3.320
The mechanical impedance and stiffness of the foundation of shipboard equipments and hulls supported by anti-vibration mount are very important so that the anti-vibration mount can accomplish its performance effectively. But, it is frequently argued how much stiffness and mechanical impedance are necessary for those foundations and hulls. In this research, it is discussed by evaluating the dynamic stiffness of the commercial anti-vibration mounts used in a naval vessel. Consequently, in this research, the minimum level of the mechanical impedance and stiffness of the foundation of shipboard equipments and hulls are suggested considering the dynamic stiffness of the mount which varies as frequency.