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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
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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
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Acoustic Radiation from the Modal Vibrations of a Thick, Finite Cylinder with Various Boundary Conditions
Lee, Hyeongill ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 585~596
DOI : 10.5050/KSNVE.2013.23.7.585
This study introduces a hybrid approach combining numerical results with pre-developed analytical calculations for the sound radiation from the modal vibration of a thick, finite length cylinder with various boundary conditions. Structural vibrations of the cylinder are numerically investigated with the finite element method, and distributions of vibratory displacements on the cylinder surface are idealized as simple mathematical expressions based on the numerical results. Sound radiations from the normal vibration of the cylinder are calculated based on idealized modal displacements using a previously introduced theoretical solution. The results are confirmed with numerical analyses using the boundary element method. Based on these results, it can be concluded that the solutions suggested in this study have good accuracies in calculating the vibro-acoustic properties of a thick, finite cylinder with various boundary conditions. Also, the sound radiation characteristics of many practical components such as brake drums and motor housings are expected to be investigated using the procedure proposed in this study.
Structural Integrity Analysis of Underwater Acoustic Sensors due to Underwater Explosion
Jung, Jae-Deok ; Hong, Suk-Yoon ; Kil, Hyun-Gwon ; Song, Jee-Hun ; Kwon, Hyun-Wung ; Jeon, Jae-Jin ; Seo, Youngsoo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 597~604
DOI : 10.5050/KSNVE.2013.23.7.597
Underwater acoustic sensors are significantly damaged from underwater explosion. The damage that affects sensor should be evaluated for its smooth operations and safety. For satisfying these objectives, it is necessary to obtain more accurate values of the pressure and the energy flux density by distance. This paper is divided into two part. First, to obtain more accurate value of the pressure and the energy flux density at each point, the simulation results and the reference values were compared. For fitting to the reference pressure and the reference energy flux density, the sizes of fluid and TNT model are corrected, and the comparison results show good agreements. Second, based on these results, the structural integrity of underwater sensor structure was analyzed when TNT located in 10 meters from underwater sensors structure. This simulation used the commercial software MSC/DYTRAN.
Characteristics of Vibration and Sound Radiated from Rails of Concrete Slab Tracks for Domestic High Speed Trains
Ryue, Jungsoo ; Jang, Seungho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 605~616
DOI : 10.5050/KSNVE.2013.23.7.605
An important source of noise from railways is rolling noise caused by wheel and rail vibrations induced by acoustic roughness at the wheel-rail contact. In the present paper, characteristics of rail vibration and radiated sound power from concrete slab tracks for domestic high speed train(KTX) is investigated by means of a numerical method. The waveguide finite element and boundary element are combined and applied for this analysis. The concrete slab track is modelled simply with a rail and rail pad regarding the concrete slab as a rigid ground. The wave types which contribute significantly to the rail vibration and radiated noise are identified in terms of the mobility and decay rates. In addition, the effect of the rail pad stiffness on the radiated power is examined for two different rail pad stiffnesses.
Estimation of Excitation Force and Noise of Drum Washing Machine at Dehydration Condition using Phase Reference Spectrum
Kim, Tae Hyeong ; Jung, Byung Kyoo ; Heo, So Jung ; Jeong, Weui Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 617~623
DOI : 10.5050/KSNVE.2013.23.7.617
Accurate prediction of the radiated noise is important to reduce the noise of the washing machine. It is also necessary to predict the excitation force accurately because excitation force can induce noise. In order to predict the excitation force acting on the washing machine, this paper conducts source identification method by use of phase reference spectrum. In this method, the transfer function between the cabinet and the motor through FEM and the measured response from the surface of the cabinet is used. The analysis of the radiation noise from the identified exciting force has been investigated. The comparison between the predicted SPL and the measured SPL at 1m apart from the front side of the washing machine showed good tendency.
Parametric Study for the Squeal Noise Reduction of an Automobile Water Pump
Kim, Bohyeong ; Jung, W. ; Baek, H. ; Kang, D. ; Chung, Jintai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 624~630
DOI : 10.5050/KSNVE.2013.23.7.624
In this study, a parametric study is performed to investigate the squeal noise of an automobile water pump. The squeal noise studied in this paper is generated by the self-excited torsional resonance of the rotating shaft, and this noise is related to the stick-slip phenomenon of the mechanical seal in the water pump. The mechanical seal friction has the characteristics of the negative velocity-gradient. The equations of motion of multiple-degree-of-freedom torsional vibration model is constructed by the Holzer's method and then the equation is transformed to an equivalent single-degree-of-freedom torsional resonance simulation model. A squeal noise criteria is determined by the simulation model to perform the parametric study. The design parameters(the mass moment of inertia of the pulley, the mass moment of inertia of the impeller, the length of the shafts, the radius of the shafts, spinning speed of the shafts, the position of the mechanical seal, radius of the mechanical seal, and normal load of the mechanical seal) are investigated to confirm the stability for the squeal noise.
Evaluation of Ride Comfort of the Passenger Vehicle Seat on Idle Vibration by Virtual Seat Method
Lee, Jae-Young ; Ahn, Se-Jin ; Jeong, Wei-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 631~639
DOI : 10.5050/KSNVE.2013.23.7.631
Virtual seat method(VSM) which is an evaluation method combined objective and subjective process is used in this study in order to determine seat comfort index of idle vibration of passenger vehicle. The VSM is implemented by two steps which are for objective index in the first step and for subjective estimation in the second step. In the study, two seats mounted on passenger vehicle was compared in terms of dynamic seat comfort by six subjects employed for the VSM method as well as SEAT value which is a conventional objective method. It is concluded that the dynamic comfort index by the VSM is more reliable than the SEAT value thanks to adding subjective evaluation on top of the objective result.
Experimental Study under Reciprocating Sliding on the Friction Noise
Choi, Hoil ; Kang, Jaeyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 640~644
DOI : 10.5050/KSNVE.2013.23.7.640
The present study provides the characteristics of friction noise under reciprocating sliding. The friction contact is generated between the aluminum plate and plastic, which results in friction noise. The experimental results reveal that the friction noise under reciprocating sliding can be produced as the friction coefficient increases. It is also shown that the vibration modes of the pin with dominant deflection in the sliding direction is participated on the friction noise.
Enhancement of SNUF Active Trailing-edge Flap Blade Mechanism Design
Natarajan, Balakumaran ; Eun, WonJong ; Shin, SangJoon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 645~653
DOI : 10.5050/KSNVE.2013.23.7.645
Seoul National University flap(SNUF) blade is a small-scale rotor blade incorporating a small trailing-edge flap control surface driven by piezoelectric actuators at higher harmonics for vibration attenuation. Initially, the blade was designed using two-dimensional cross-section analysis and geometrically exact one-dimensional beam analysis, and its material configuration was finalized. A flap-deflection angle of
was established as the criterion for enhanced vibration reduction based on an earlier simulation. The flap-linkage mechanism was designed and static bench tests were conducted for verifying the performance of the flap-actuation mechanism. Different versions of test beds were developed and tested with the designed flap and the selected APA 200M piezoelectric actuators. Through significant improvements, a maximum deflection of
was achieved. High-frequency experiments were conducted for evaluating the performance, and the transfer function of the test bed was determined experimentally. With the static tests almost complete, the rotor power required for testing the blade in a whirl tower (centrifugal environment) was calculated, and further preparations are underway.
Analyses on Working Frequency of A γ-type Free-piston Stirling Engine
Jang, Seon-Jun ; Sim, Kyuho ; Lee, Yoon-Pyo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 654~661
DOI : 10.5050/KSNVE.2013.23.7.654
The dynamic characteristics of a free-piston stirling engine(FPSE) with regard to the working frequency is investigated from theoretical and experimental studies. The FPSE is modeled as a two degree-of-freedom linear vibration system. A theoretical expression on the working frequency is derived from the instability condition for self-excitation based on the linear vibration model. A
-type free-piston stirling engine is fabricated for experimental studies, and its working frequency is measured on various heater temperatures. Comparisons between the theoretical and experimental results reveal that the working frequency of the test FPSE depends on both the temperature of the compression space and the temperature difference between the expansion and compression spaces.
Numerical Investigation on Surge Motion of a Rectangular Floating Body due to Inner Sloshing Phenomena
Ha, Minho ; Cheong, Cheolung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 662~668
DOI : 10.5050/KSNVE.2013.23.7.662
In this paper, possibility of controlling motion of a floating structure using a tuned liquid damper (TLD) is numerically investigated. A TLD is a tank partially filled with liquid. Sloshing motion of liquid inside a tank is known to suppress movement of the tank subject to external excitations at specific frequency. The effects of sloshing phenomena inside a rectangular floating body on its surge motion are investigated by varying external excitation frequency. First, a grid-refinement study is carried out to ensure validity of grid independent numerical solutions using present numerical techniques. Then, surge motion of the floating body subjected to external wave is simulated for five different excitation frequencies of which the center frequency equals to the natural frequency of internal liquid sloshing. The normalized amplitudes of surge motion of the target floating body are compared according to the excitation frequency, for the cases with and without water inside the floating body. It is shown that the motion of the floating body can be minimized by matching the sloshing natural frequency to the excitation frequency.
Research for the Development of a pRMC Program for the Planetary Gear Noise
Lee, Hyun Ku ; Kim, Moo Suk ; Suh, Hyun Seung ; Kim, Jin Ho ; Kahraman, Ahmat ; Harianto, Jonny ; Kwon, Hyun Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 7, 2013, Pages 669~674
DOI : 10.5050/KSNVE.2013.23.7.669
To design the optimized low noise planetary gear sets, a program called pRMC(planetary run many cases) is developed. The pRMC is especially using a combination analysis method for all gear specifications and also able to analyze any type of planetary gear sets. The pRMC is composed of the 5 sections those are generate, setting, evaluate, combine and analysis. After calculating all candidate gear sets, the pRMC could show many results that represent the character of each gear set including the transmission error which is the main gear noise factor, the contact ratios, the bending stress and so on. By comparing the results objectively, user could predict and select the optimized gear set which has quiet noise level and desired durability. The planetary gear designed by pRMC could have reduced noise and vibration level from 5 to 10 dB than previous-designed one.