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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
Optimization of the Gas-Gas Heater Element for Desulfurization Equipment through Fluid Analysis of considering Deposition Particles
Oh, B.J. ; Ryu, B.J. ; Lee, Y.S. ; Kim, J.H. ; Baek, S.G. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 611~619
DOI : 10.5050/KSNVE.2010.20.7.611
The paper deals with the proper design of GGH(gas-gas heater) panel elements of desulfurization equipments in a thermoelectric power plant. When fossil fuels such as coal, petroleum et cetera are burnt to ashes, sulfur oxide compounds are produced, and calcareous sludges are deposited at GGH panel elements. In this case, operation of a power plant equipments is interrupted, and a tremendous economic loss comes into existence. One of the purposes of the paper is to find flow velocity distributions and regions of depositions when calcareous sludges pile up on the GGH panel elements through the fluid analysis. In the fluid analysis, flow velocity and position distributions of particles between GGH panel elements are demonstrated according to time variation for ammonia and calcium hydroxide particles.
Sensitivity-based BWIM System Using Dynamic Strain Responses of Bridge Deck Plate
Kim, Byeong-Hwa ; Park, Min-Seok ; Yeo, Keum-Soo ; Kim, Soo-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 620~628
DOI : 10.5050/KSNVE.2010.20.7.620
Using the responses of deck plate, a new bridge weigh-in-motion system has been introduced. The approach includes not only a systematic algorithm for the extraction of moment influence sequence but also a sensitivity-based system identification technique. The algorithm indentifies the influence sequence, the axle loads, and axle location of moving vehicles on a bridge, simultaneously. The accuracy and practicability of the algorithm have been examined experimentally for a folded deck plate on Yongjong Grand suspension bridge. It turns out that the two-dimensional effects of the behavior of deck plate should be considered for further accuracy improvement.
A Study on Conceptual Design of Anti-rolling Devices for 250 TEU Class Mobile Harbors
Chung, T.Y. ; Moon, S.J. ; Lew,, J.M. ; Park, C.H. ; Cho, H.W. ; Kim, B.I. ; Yoon, H.K. ; Kang, J.Y. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 629~636
DOI : 10.5050/KSNVE.2010.20.7.629
A Mobile Harbor is a new transportation platform which can load and unload has containers to and from very large container ships on the sea. Currently designed Mobile Harbor a catamaran type which is equipped with precisely controlled gantry crane on the deck, and can transport 250 TEUs at a time. Loading and unloading works by crane require very small motion of Mobile Harbor in waves, because it may be operated outside of harbors. In this project, applicability of both tuned-type anti-rolling tank and maglev-type active mass driver is studied as anti-rolling systems.
Development of a 6-DOF Active Vibration Isolation System Using Voice Coil Motor
Gil, Hyeong-Gyeun ; Kim, Kwang-San ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 637~643
DOI : 10.5050/KSNVE.2010.20.7.637
The paper is about the development of 6-DOF active vibration isolation systems using VCM. Firstly, formulate the vertical 3-DOF mathematical model under eccentric load, and compare the model with the case in which the center of mass is located at the centroid. And then, complete the 6-DOF mathematical model by formulating the horizontal 3-DOF mathematical model. Find main parameters by comparing the result of the frequency response test with simulation result on the model. Finally, achieve the performance of vibration isolation by applying loop shaping approach & feedforward controller.
Evaluation of BSR Noise Properties of Instrument Panel in a Vehicle
Shin, Su-Hyun ; Cheong, Cheol-Ung ; Kim, Duck-Whan ; Jung, Sung-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 644~650
DOI : 10.5050/KSNVE.2010.20.7.644
Among various elements to affect customer`s evaluation of vehicle quality, BSR(Buzz, Squeak, Rattle) are considered to be a mostly contributing factor. In this paper, we provide the test method which can be used to reduce the BSR noise of instrument panel in a vehicle. First, potential source regions of the instrument panel for BSR are localized by using the vibration-excitor and near-acoustic field visualization system. Then, subjective evaluation of BSR noise from the detected potential noise source regions is made with the Zwicker`s loudness and time-varying loudness methods. This illustrative analysis reveals that current experimental methods can be used as a test procedure to systematically tackle BSR issues in early stage of the vehicle development cycle, which can result in the reduction of the production cost.
The Effect of Dynamic Property of Absorbing Sheet on the Amplification of Heavy Weight Floor Impact Noise
Hwang, J.S. ; Moon, D.H. ; Park, H.G. ; Hong, S.G. ; Hong, G.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 651~657
DOI : 10.5050/KSNVE.2010.20.7.651
Previous experimental results performed by many researchers for a couple of decades in South Korea have shown that an absorbing sheet inserted in a conventional floating slab system for thermal insulation or vibration absorption may amplify the vibration of the slab system at specific frequency ranges depending on the material properties of the sheet. The amplified vibration, consequently, results in the heavy weight floor impact noise exceeding the sound level limit for an apartment house, 50 dB. In this study, the amplification mechanism is examined through numerical analysis and a new slab system is proposed to reduce the amplification and control the noise. The new slab system consists of studs connecting the base slab and upper concrete finishing yielding the dramatically increased stiffness of the slab. The numerical simulation is performed to investigate the effect of the slab system with studs on the vibration and noise control. The results show that the performance of the slab is sensitive to the number and location of studs, and the heavy weight floor impact noise can be reduced up to 6~7 dB compared to the conventional slab system at the optimal stud location.
Drop and Damping Characteristics of the CEDM for the Integral Reactor
Choi, M.H. ; Kim, J.H. ; Huh, H. ; Yu, J.Y. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 658~664
DOI : 10.5050/KSNVE.2010.20.7.658
A control element drive mechanism(CEDM) is a reactor regulating system, which inserts, withdraws or maintains a control rod containing a neutron absorbing material within a reactor core to control the reactivity of the core. The ball-screw type CEDM for the integral reactor has a spring-damper system to reduce the impact force due to the scram of the CEDM. This paper describes the experimental results to obtain the drop and damping characteristics of the CEDM. The drop tests are performed by using a drop test rig and a facility. A drop time and a displacement after an impact are measured using a LVDT. The influences of the rod weight, the drop height and the flow area of hydraulic damper on the drop and damping behavior are also estimated on the basis of test results. The drop time of the control element is within 4.5s to meet the design requirement, and the maximum displacement is measured as 15.6 mm. It is also found that the damping system using a spring-hydraulic damper plays a good damper role in the CEDM.
An Experimental Research for the Optimization of the Gear Grinding Machine`s Operating Condition
Lee, Hyun-Ku ; Kim, Moo-Suk ; Kang, Koo-Tae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 665~671
DOI : 10.5050/KSNVE.2010.20.7.665
To improve the gear noise quality, gear tooth grinding machine are widely used in automotive industry. While using the gear profile grinding machine to improve the gear tooth quality of the transmission, several defects such as chattering, tooth waves that cause the gear noise occasionally happened. But it is very difficult to solve that problem, because there is no one who knows the setting up the optimal grinding condition appropriately. The abnormal manufacturing conditions which make the gear noise make the engineer to spend a lot of time, effort, and money. Due to demands for solving the serious abnormal gear noise happened in the automatic transmission in the mass product stage, the vibration checking process in the worm wheel axis, work rotation and fixed axis of the grinding machine were adapted to find the root causes. As a result, gear profile wave are affected by the work rotation axis`s unbalance which is caused by worm wheel feeding speed. And a primary and the secondary grinding feeding speed, cutting oil, work fixed forces are also proved as the important factors. After setting up the grinding condition reported in this paper, it was adapted successfully to the grinding machine to manufacture the new automatic transmissions` gear. The gear noise was dramatically disappeared and the process and the results will offer good guides to the engineers who manufacture the gear with the grinding machine.
Sound Insulation Design of the Corrugated Steel Panel Considering Local Resonance
Kim, Seock-Hyun ; Lee, Hyun-Woo ; Kim, Jung-Tae ; Kim, Jae-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 672~676
DOI : 10.5050/KSNVE.2010.20.7.672
In a railway vehicle, corrugated steel panel is widely used for the floor structure because of its high bending stiffness and light weight. However, this panel shows lower sound insulation performance than that of the flat plate with the same weight. Especially, in a particular frequency region, transmission loss(TL) rapidly decreases and it results in the deterioration of sound insulation performance of the overall floor structure. This study identifies that the severe decrease in TL is caused from the local resonance of the periodic corrugated structure. TL decrease by local resonance is investigated by experiment and finite element analysis. Finally, design modification of the corrugation is proposed to improve TL and the effect is verified by experiment.
Nonlinear Dynamic Analysis of Helical Gears with Backlash by Torque Fluctuation
Park, Chan-IL ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 677~684
DOI : 10.5050/KSNVE.2010.20.7.677
Backlashes of gears provide gears for good lubrication and for removal of the interference between teeth by the wear and manufacturing errors. The backlash is the strong nonlinear factor to gears. This study deals with nonlinear modeling of helical gears with backlash. Excitation of helical gears comes from torque variation, the tooth surface error, and the periodical change of mesh stiffness. To study the effect of torque fluctuation, equation of motion for the single degree of freedom torsional model of helical gears with the periodical change of mesh stiffness and the backlash was derived. The Newmark beta method and the Newton-Raphson method were used to obtain the nonlinear behaviors of mesh forces of helical gears. All excitation frequencies initially caused the tooth separation and single-sided impacts of the gear pair and eventually led to the normal tooth contact. However, some special excitation frequencies caused the single-sided impacts in the entire time as well as the initial time. Damping increase reduced the duration of single-sided impacts, and the backlash increase caused those in the entire time domain.
A Study on Development of an Active Hybrid Mount for Naval Shipboard Equipment
Moon, S.J. ; Choi, S.M. ; Jeong, J.A. ; Choi, S.B. ; Jung, W.J. ; Koo, J.Y. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 7, 2010, Pages 685~692
DOI : 10.5050/KSNVE.2010.20.7.685
A hybrid mount for shipboard machinery installed on naval ships was developed. The mount is combined with a rubber mount and a piezostack actuator. The rubber mount is one of the most popular and effective passive mounts to have been applied to various vibration systems to date. The piezostack actuator is featured by a fast response time, small displacement and low power consumption. Through a series of experimental tests conducted in accordance with MIL-M-17185A(SHIPS), MIL-M-17508F(SH), and MIL-S-901D which are US military specifications related to the performance requirements of the mount, it has been confirmed that the hybrid mount shows more effective performance for use in naval ships.