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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 20, Issue 12 - Dec 2010
Volume 20, Issue 11 - Nov 2010
Volume 20, Issue 10 - Oct 2010
Volume 20, Issue 9 - Sep 2010
Volume 20, Issue 8 - Aug 2010
Volume 20, Issue 7 - Jul 2010
Volume 20, Issue 6 - Jun 2010
Volume 20, Issue 5 - May 2010
Volume 20, Issue 4 - Apr 2010
Volume 20, Issue 3 - Mar 2010
Volume 20, Issue 2 - Feb 2010
Volume 20, Issue 1 - Jan 2010
Selecting the target year
Study on Quality Criteria for Transparent Soundproof Panels(1) - Evaluation of Mechanical Performance and Safety
Chang, Tae-Sun ; Kim, Chul-Hwan ; Hwang, Cheol-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1111~1120
DOI : 10.5050/KSNVE.2010.20.12.1111
A variety of materials may be used for soundproof panels. The major advantage of transparent material over traditional materials in noise barriers is aesthetics. The transparent panel materials such as clear plastic or glass are an ideal way of reducing or virtually eliminating the visual impact of a noise barrier. With the use of transparent materials, the drivers' view of the roadside and the sunlight penetration to the highway would not be blocked. Korean Industrial Standards for soundproof panels have been established. But, transparent soundproof panels are not included in this standards. And, some specifications provide only a few basic characteristics for transparent soundproof panels. To develop guidelines on quality criteria for transparent soundproof panel, their mechanical properties such as wind load resistance, safety under impact, and abrasion resistance were experimentally investigated.
Human Response to Idle Vibration of Passenger Vehicle Related to Seating Posture
Jeon, Gyeoung-Jin ; Kim, Min-Seok ; Ahn, Se-Jin ; Jeong, Weui-Bong ; Yoo, Wan-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1121~1127
DOI : 10.5050/KSNVE.2010.20.10.1121
Human characteristic responding to idle vibration on passenger vehicle was studied to find if affected by seating posture of passenger. When twelve male subjects are exposed to moderate vertical vibration of 0.224
r.m.s. at frequency range from 3 Hz to 40 Hz, it was found that seating posture significantly affects to biodynamical characteristics, apparent mass and apparent eccentric mass, at most range of idle vibration frequency(20~40 Hz). The supported thigh contact on rigid seat showed bigger values in the two biodynamical characteristics than the average thigh contact. The bigger apparent mass and apparent eccentric mass in the seating posture of the supported thigh contact can be assumed more strengthened muscle at the frequency range.
An Electro-magnetic Air Spring for Vibration Control in Semiconductor Manufacturing
Kim, Hyung-Tae ; Kim, Cheol-Ho ; Lee, Kang-Won ; Lee, Gyu-Seop ; Son, Sung-Wan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1128~1138
DOI : 10.5050/KSNVE.2010.20.12.1128
One of the typical problems in the precise vibration is resonance characteristics at low frequency disturbance due to a heavy mass. An electro-magnetic(EM) air spring is a kind of vibration control unit and active isolator. The EM air spring in this study aims at removing the low frequency resonance for semiconductor manufacturing. The mechanical and electronic parts in the active isolator are designed to operate under a weight of 2.5 tons. The EM spring is floated using air pressure in a pneumatic elastic chamber and actuated by EM levitation force. The actuator consists of a EM coil and a permanent magnetic plate which are installed inside of the chamber. An air mount was constructed for the experiment with a stone surface plate, 4 active air springs, 4 gap sensors, a DSP controller, and a multi-channel power amp. A PD control method and operating logic was applied to the DSP. Simulation using 1/4 model was carried out and compared with the experiments. The time duration and maximum peak at resonance frequency can be reduced sharply by the proposed system. The results show that the active system can avoid the resonance caused by the natural frequency of the passive system.
Development of the Silencer for Reducing Noise from the Exhaust Cooling Fan of the TASS Console
Han, Hyung-Suk ; Park, Mi-Yoo ; Cho, Heung-Gi ; Kim, Joong-Gil ; Im, Dong-Been ; Son, Yoon-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1139~1146
DOI : 10.5050/KSNVE.2010.20.12.1139
The indoor noise of the naval vessel is very important related to the optimum environmental conditions for crews as well as the ability of fighting power of antisubmarine. Especially, sonar equipment room is one of the rooms where require to be silent because the informations of the underwater noise are collected and analyzed in there. In this paper, the sound reduction of the TASS console, one of the main noise sources in a sonar equipment room for a typical naval vessel, is described. The noise source of this TASS console is the flowing noise of cooling fan. In order to reduce this kind of noise, the plenum chamber and acoustic elbow were developed. Related to the development of the plenum chamber, the area of the air-outlet and sound absorption of the inner lining were investigated experimentally with the evaluation system of the sound insertion loss. Acoustic elbow was also manufactured and evaluated with the evaluation system of the sound insertion loss. Finally, in order to evaluated the ability of noise reduction of the plenum chamber and acoustic elbow, the indoor noise of the sonar equipment was measured when they were appled to TASS console.
Experimental Study for the Reduction of Wet-brake Squeal Noise in a Forklift
Kim, Tae-Jong ; Koo, Ja-Ham ; Jeong, Weui-Bong ; Kim, Young-Hyun ; Joo, Won-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1147~1152
DOI : 10.5050/KSNVE.2010.20.12.1147
The wet brakes used in an industrial forklift often produce noise on braking. Elimination or reduction of this squeal noise is an important task for the improvement of comforts. In this paper, a test rig was developed which was possible for testing of brake noise and an experimental measurement on squeal noise was performed. The causes of the brake noise are identified by experimenting how the factors such as automatic transmission fluid, the groove of friction-plate pad and the material of friction-plate pad affect the squeal noise. In order to identify the squeal characteristics, the signal analyses for noise are performed by using frequency spectrums. Experimental results showed that the viscosity of automatic transmission fluid and the groove pattern of friction-plate pad largely affect the reduction of the wet brake squeal noise in an industrial forklift.
A Study on the Frequency Convergence Phenomenon in a Rotating Circular Plate with Slots
Hwang, Seoung-Tack ; Kim, Seong-Jin ; Yoo, Jeong-Hoon ; Lee, Seung-Yop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1153~1160
DOI : 10.5050/KSNVE.2010.20.12.1153
A circular plate is the main part of a circular saw blade, which is widely used in industrial cutting tools. In experiments using a circular saw containing slots, we observed that a number of natural frequencies are simultaneously emerged in specific frequency regions. The interesting phenomenon is called the frequency convergence. Effects of design parameters such as the number, the length and the width of slots, on the frequency-convergence phenomenon are analyzed by FEM simulations using ALGOR. The frequency-convergence phenomenon will be intensified when the number, length and width of slots increase.
Experimental Performance Evaluation of MR Damper for Integrated Isolation Mount
Seong, Min-Sang ; Choi, Seung-Bok ; Kim, Cheol-Ho ; Lee, Hong-Ki ; Baek, Jae-Ho ; Han, Hyun-Hee ; Woo, Je-Kwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1161~1167
DOI : 10.5050/KSNVE.2010.20.12.1161
This paper presents experimental performance evaluation of a magnetorheological(MR) damper for integrated isolation mount for ultra-precision manufacturing system. The vibration sources of the ultra-precision manufacturing system can be classified as follows: the one is the environmental vibration from the floor and the other is the transient vibration occurred from stage moving. The transient vibration occurred from the stage moving has serious adverse effect to the process because the vibration scale is quite larger than other vibrations. Therefore in this research, a semi-active MR damper, which can control the transient vibration, is adopted. Also the stage needs to be isolated from tiny vibrations from the floor. For this purpose, a dry-frictionless MR damper is required. In order to achieve this goal, a novel type of MR damper is originally designed and manufactured in this work. Subsequently, the damping force characteristics of MR damper are evaluated by simulation and experiment. In addition, the vibration control performance of the MR damper associated with the stage mass is evaluated.
Study on the Parameter Decision of Spring-viscous Dampers for Torsional Vibration Reduction of Diesel Engine Shafting System
Lee, D.H. ; Chung, T.Y. ; Kim, Y.C. ; Shin, Y.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1168~1175
DOI : 10.5050/KSNVE.2010.20.12.1168
Excessive torsional vibrations from marine engine shafting systems can be reduced by using torsional vibration dampers. But in order to be tuned effectively, the dampers should be designed through the optimum design procedure. In this paper, the procedure to get the optimum values of system parameters of spring-viscous dampers using effective modal mass of inertia and stiffness is suggested and the damping is determined by the exact algebra optimization method. The validity of the suggested method is confirmed through the application to a 1800 kW four cycle diesel engine and generator system.
Active Vibration Control Experiment of Cantilever Using Active Linear Actuator for Active Engine Mount
Yang, Dong-Ho ; Kwak, Moon-K. ; Kim, Jung-Hoon ; Park, Woon-Hwan ; Sim, Ho-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1176~1182
DOI : 10.5050/KSNVE.2010.20.12.1176
Vibrations caused by automobile engine are absorbed mostly by a passive-type engine mount. However, user specifications for automobile vibrations require more stringent conditions and higher standard. Hence, active-type engine mount have been developed to cope with such specifications. The active-type engine mount consists of sensor, actuator and controller where a control algorithm is implemented. The performance of the active engine mount depends on the control algorithm if the sensor and actuator satisfies the specification. The control algorithm should be able to suppress persistent vibrations caused by the engine which are related to engine revolution. In this study, three control algorithms are considered for suppressing persistent vibrations, which are the positive position feedback control algorithm, the strain-rate feedback control algorithm, and the modified higher harmonic control algorithm. Experimental results show that all the control algorithms considered in this study are effective in suppressing resonant vibrations but the modified higher harmonic controller is the most effective controller for non-resonant vibrations.
Shock Resistance Analysis of a Propulsion Motor for Naval Vessels
Bae, Sung-Wook ; Hong, Chin-Suk ; Jeong, Weui-Bong ; Park, Young-Su ; Bin, Jae-Goo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1183~1189
DOI : 10.5050/KSNVE.2010.20.12.1183
Shock-resistance test for a real equipment for a normal vessel is one of the difficult problem in many cases because of terrible cost and weight. An analysis technique to evaluate the shock resistance in a design stage is necessary, instead In this paper, the process to evaluate the shock resistance of a propulsion motor for naval vessels was presented based on German navy's BV043 regulation. The shock signal to impose the equipment under the test was first evaluated, and was then applied to the structural FE model of the equipment. From the transient FEA, the time history of von-Mises stress was obtained by the mode superposition method. The shock resistance was evaluated using the peak value of the von-Mises stress.
Active Control of Clamped Beams using Acceleration Feedback Controllers
Shin, Chang-Joo ; Hong, Chin-Suk ; Jeong, Weui-Bong ; Jeong, Sang-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1190~1199
DOI : 10.5050/KSNVE.2010.20.12.1190
This paper reports active control of clamped beams using acceleration feedback controllers (AF). The equations of motion of clamped beam under force and moment pairs were derived and the equations of AF controllers were formulated. The effect of the parameters - gain and damping ratio - of the AF controllers on the open loop transfer function was investigated mainly in terms of the system stability. Increasing the gain of the AF controller tuned at a mode, the magnitude of the open loop transfer function is increased at all frequencies. The increase of the damping ratio of the AF controller leads to decrease the magnitude of the open loop transfer function and modifies its phase characteristics to be more stable. Three AF controllers connected in parallel were then proposed. Each AF controller is tuned at the 2nd, 3rd and 4th 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 3 modes can be obtained.
A Study on Performance Prediction for a Magnetostrictive Ultrasonic Transducer According to Arrangement of Permanent Magnets for Biasing
Lee, Ho-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1200~1209
DOI : 10.5050/KSNVE.2010.20.12.1200
The main subject of this paper is to develop analytic method with which output power or sensitivity variations of a magnetostrictive ultrasonic transducer can be estimated with no aid of experiments. After the bias magnetic field deployed over the patch is calculated using finite element analysis for magnetostatics, the representative value is extracted by averaging these field values. The operating point on the characteristic curve for magnetostriction is identified by this value and then the output performance is calculated from it. It is verified that the results from this simple model match well with those of its experimental version and some limits of this modeling technique are also considered.
Cabin Noise Reduction Using Unit Cabin Mock-up of High Value-added Vessel
Song, Keun-Bok ; Joo, Won-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1210~1215
DOI : 10.5050/KSNVE.2010.20.12.1210
Unit cabin means room, which is installed in the high value-added vessel such as drill ship, offshore platform and FPSO, after pre-assembled. In order to develop the noise control design for a unit cabin, a variety of acoustic tests such as sound absorption, transmission and radiation measurements were carried out by using the deckhouse mock-up. From the tests, it was found out that the sound transmission loss between cabin and corridor was 13 dB below than FPSO standard and the combined noise level of the unit cabin was dominated by the radiated noise from wall panel in low frequency range. Based on the test results, design guidelines for the noise control of the unit cabin were fully established, such as the improvement of sound transmission loss between the cabin and corridor, and radiated cabin noise reduction.
Study on the Position of Error Sensors in an Active Soft Edge Noise Barrier
Baek, Kwang-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1216~1222
DOI : 10.5050/KSNVE.2010.20.12.1216
Based on the MacDonald's analytic model for the diffracted sound field of a semi-infinite noise barrier, computer simulations were performed for various positions of error microphones for an active noise barrier system. The simulation process also included the effects of floor reflections on both sides of the barrier. The results were also compared with Niu's simulation results and showed a straight line arrangement of sensors and actuators, in the order of primary source, secondary source and error microphone is better than over the top arrangement of the error microphones.
Case study for Sound Quality Index of Vacuum Cleaner' Operating Noise
Jeong, Jae-Eun ; Yang, In-Hyung ; Park, Goon-Dong ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1223~1228
DOI : 10.5050/KSNVE.2010.20.12.1223
The conventional noise control attempts to simply reduce the level of product noise. But it is very straight forward way that we have considered human perception on noise. Since human listening is very sensitive to sound. Evaluation of the sound quality of a vacuum cleaner is studied base on human sensibility engineering. In this paper, we choose six vacuum cleaners that are sold in Korea and reduced noise control. The sound quality of vacuum cleaner noise is analyzed by employing the subjective evaluation and by representing them in terms of the objective quantities. Semantic differential method is used to study sound quality Evaluation. To analyze the sound quality of vacuum cleaner noise, consider the coefficients of correlation between sound metrics and subjective rating. The linear regression models were obtained for the subjective evaluation and sound quality metrics.
A Review on the Blast Resistant Design for Glazing and Window Systems Subject to High-explosive Loadings
Huh, Young-Cheol ; Chung, Tae-Young ; Oh, Sung-Keun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 12, 2010, Pages 1229~1235
DOI : 10.5050/KSNVE.2010.20.12.1229
Anti-terrorism design for public buildings as well as military facilities is important to minimize the mass casualties from terrorist attacks. Also, well designed glazing and window systems can reduce the potential injury of human caused by scattering fragment of a glazing. In this paper, blast resistant design for glazing and window systems is investigated based on the U.S. Standard. The design procedures include minimum requirements for the design, standard practice for design evaluation of the glazing and standard test method for evaluation of the performance.