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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
Mechanism Diagnosis and Avoidance Design on Transient Acoustic Vibration of Reheater Water Supply Piping in Supercritical Boiler
Kim, Yeon-Whan ; Bae, Yong-Chae ; Kim, Jae-Won ; Lee, Doo-Young ; Heo, Hae-Yong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 385~393
DOI : 10.5050/KSNVE.2013.23.5.385
In this paper, the mechanism identification and the avoidance measures on the phenomena of transient acoustic vibration amplified at the water-supply piping system to regulate the steam temperature of the boiler reheater in 500MW class supercritical power plant are presented. The pressure pulsation waves induced by the impeller passing of two feed-water pumps with five blades are coincident with the local acoustic modes of boiler reheater water-supply piping system. There are the phenomena amplified at the peaks of 5X, 10X, 15X and 20X in spectrums of piping vibration, sound pressure, and the feed-water's pressure pulsation waves. The shut-off device is installed in the piping system for the interception of pressure pulsation waves transmitted from two feed-water pumps and the modified design change of the piping layout is applied for the acoustic resonance avoidance. The acoustic natural frequencies are separated from the harmonics of pressure pulsation waves induced by the pump impellers passing through the design change of the span length. The acoustic vibration is gone by resonance avoidance measures. As a result, more than 20 dBA reduction is achieved from 100 dBA to 80 dBA.
Estimation of the Underwater Radiated Noise of a Naval Vessel Using Hull Vibration
Han, Hyung-Suk ; Lee, Kyung-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 394~400
DOI : 10.5050/KSNVE.2013.23.5.394
Underwater radiated noise is one of the important performances related to stealth of the naval vessel. However, the evaluation can't be performed frequently due to the cost. Therefore, the estimation method of the underwater radiated noise with average hull vibration is suggested in this paper assuming that the hull of the ship is infinite plate which consists of various unit plates. Through the experiment, the estimated noise is verified from the comparison to the measured data. In addition the difference of underwater radiated noise according to the operating equipments is estimated with measured vibration velocity.
Functional Verification of Engineering Model of Non-explosive Shockless Holding and Release Mechanism Using Heating Wire Cutting Method
Oh, Hyun-Ung ; Jeon, Su-Hyeon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 401~406
DOI : 10.5050/KSNVE.2013.23.5.401
Non-explosive shockless holding and release mechanism for a nano class small satellite application has been proposed and investigated. The great advantages of the mechanism are a much lower shock level and larger constraint force than the conventional mechanism using pyro and the heating wire cutting mechanism which has been generally applied to the cube satellite program. To investigate the effectiveness of the mechanism design, EM mechanism was developed and tested to verify the basic function of the mechanism. The test results indicate that the proposed mechanism is well functioning as the mechanism design intends.
Analysis of Effects of Mooring Connection Position on the Dynamic Response of Spar type Floating Offshore Wind Turbine
Cho, Yanguk ; Cho, Jinrae ; Jeong, Weuibong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 407~413
DOI : 10.5050/KSNVE.2013.23.5.407
This paper deals with the analysis of dynamic characteristics of mooring system of floating-type offshore wind turbine. A spar-type floating structure which consists of a nacelle, a tower and the platform excepting blades, is used to model the floating wind turbine and connect three catenary cables to substructure. The motion of floating structure is simulated when the mooring system is attached using irregular wave Pierson-Moskowitz model. The mooring system is analyzed by changing cable position of floating structure. The dynamic behavior characteristics of mooring system are investigated comparing with cable tension and 6-dof motion of floating structure. These characteristics are much useful to initial design of floating-type structure. From the simulation results, the optimized design parameter that is cable position of connect point of mooring cable can be obtained.
The Effect of Aerated Concrete containing Foam Glass Aggregate on the Floor Impact Sound Insulation
Yun, Chang-Yeon ; Jeong, Jeong-Ho ; Kim, Myung-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 414~422
DOI : 10.5050/KSNVE.2013.23.5.414
As structure-borne sound, the floor impact sound is one of the serious noises in residential building. Most of heating system applied to the typical Korean residential building is floor heating system which is called ondol. The ondol usually consists of finishing material, mortar with heating coil, light-weight aerated concrete and reinforced concrete. This study focused on the isolation of heavy-weight impact sound and modification of mortar and light-weight aerated concrete. Specifically the glass foam aggregate was added on light-weight aerated concrete. Also, water-cement ratio and amount of cement on mortar were revised. The sound pressure level of heavy-weight impact was measured in reverberation chamber using both bang-machine and impact ball. The size of specimen was 1 m by 1 m. Substitution ratio of glass foam aggregate on light-weight aerated concrete shows relationship with heavy-weight impact sound pressure level. In addition, heavy-weight impact sound pressure level was decreased with increment of water-cement ratio and amount of cement on mortar.
Characteristics of Friction Noise with Respect to Friction Curve
Nam, Jaehyun ; Kang, Jaeyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 423~430
DOI : 10.5050/KSNVE.2013.23.5.423
The characteristics of friction noise due to the friction-velocity curve is experimentally investigated through the pin-on-disk setup. The rotation speed of the disk is controlled in order to produce the sliding speed variation. Then, the friction coefficient and the corresponding friction noise are simultaneously measured with respect to the sliding speed between the steel disk and aluminum pin. The experimental results show that the negative friction-velocity slope is essential in generating friction noise.
Analysis of Field Noise from High Speed Train Using Dedopplerization
Lee, Yong Woo ; Lee, Duck Joo ; Kwon, Hyeok Bin ; Yun, Su Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 431~437
DOI : 10.5050/KSNVE.2013.23.5.431
Measured acoustic signal from operating high speed train contains frequency change called doppler shift due to its motion. To avoid this doppler shift wind tunnel test is required. But scaledown of model can cause change of source characteristics. And measurements using some part of train cannot reproduce real flow condition. The best way to recognize real noise source characteristics is measurement from operating high speed train but doppler shift makes it hard. So, we developed simple dedopplerization technique for one microphone and applied to field test data of high speed train. Through this, we could capture real frequency of noise from operating high speed train.
Replication of Automotive Vibration Target Signal Using Iterative Learning Control and Stewart Platform with Halbach Magnet Array
Ko, Byeongsik ; Kang, SooYoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 438~444
DOI : 10.5050/KSNVE.2013.23.5.438
This paper presents the replication of a desired vibration response by iterative learning control (ILC) system for a vibration motion replication actuator. The vibration motion replication actuator has parameter uncertainties including system nonlinearity and joint nonlinearity. Vehicle manufacturers worldwide are increasingly relying on road simulation facilities that put simulated loads and stresses on vehicles and subassemblies in order to reduce development time. Road simulation algorithm is the key point of developing road simulation system. With the rapid progress of digital signal processing technology, more complex control algorithms including iterative learning control can be utilized. In this paper, ILC algorithm was utilized to produce simultaneously the six channels of desired responses using the Stewart platform composed of six linear electro-magnetic actuators with Halbach magnet array. The convergence rate and accuracy showed reasonable results to meet the requirement. It shows that the algorithm is acceptable to replicate multi-channel vibration responses.
Control of Damping Coefficients for the Shear Mode MR Dampers Using Inverse Model
Na, Uhn Joo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 445~455
DOI : 10.5050/KSNVE.2013.23.5.445
A new linearization model for MR dampers is analyzed. The nonlinear hysteretic damping force model of MR damper can be modeled as a hyperbolic tangent function of currents, positions, and velicities, which is an algebraic function with constant parameters. Model parameters can be identified with numerical method using experimental force-velocity-position data obtained from various operating conditions. The nonlinear hysteretic damping force can be linearized with a given slope of damping coefficient if there exist corresponding currents to compensate for the nonlinearity. The corresponding currents can be calculated from the inverse model when the given linear damping force is set equal to the nonlinear hysteretic damping force. The linearization controller is realized in a DSP controller such that the corresponding currents to satisfy a given damping coefficient should be calculated. Experiments show that the current inputs to the MR damper produce linearized damping force with a given slope of the damping coefficient.
Evaluations of the Acoustics Characteristics of Cellulose Absorbers
Yeon, Joon-Oh ; Kim, Kyoung-Woo ; Yang, Kwan-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 456~462
DOI : 10.5050/KSNVE.2013.23.5.456
Eco-friendly material applied to building would be one of the materials which is must developed for global environmental conservation and reduction of carbon dioxide. For development of eco-friendly material, a cellulose absorber has been developed with waste paper through adjustment of various mix proportions. The developed cellulose absorber has been tested for its acoustic properties such as absorption coefficient and dynamic stiffness. The absorption coefficient was evaluated by developing six samples and using impedance tube and reverberation chamber. As a result of the evaluation, 0.64(NRC) was secured in absorption coefficient and 4.7
was indicated in dynamic stiffness. Also, for practical use of developed absorbers as inner heartwood in drywall, comparison test of sound reduction index was performed with existing glass wool absorbers and constructed drywall of gypsum board. The results have shown 55 dB(Rw) of sound reduction index in glass-wool wall and 46 dB(Rw) in cellulose.
Ride Comfort Evaluation of Electronic Control Suspension Using a Magneto-rheological Damper
Sung, Kum-Gil ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 463~471
DOI : 10.5050/KSNVE.2013.23.5.463
This paper presents design and control of electronic control suspension(ECS) equipped with controllable magnetorheological(MR) damper for passenger vehicle. In order to achieve this goal, a cylindrical type MR fluid damper that satisfies design specification of a middle-sized commercial passenger vehicle is proposed. After manufacturing the MR damper with design parameters, their field-dependent damping forces are experimentally evaluated and compared with those of a conventional damper. A quarter-vehicle MR ECS system consisting of sprung mass, spring, tire, controller and the MR damper is established in order to investigate the ride comfort performances. On the basis of the governing equation of motion of the suspension system, five control strategies(soft, hard, comfort, sport and optimal mode) are formulated. The proposed control strategies are then experimentally realized with the quarter-vehicle MR ECS system. Control performances such as vertical acceleration of the car body and tire deflection are evaluated in frequency domains on random road condition. In addition, performance comparison of WRMS(weighted root mean square) of the quarter-vehicle MR ECS system on random road are undertaken in order to investigate ride comfort characteristics.
Optimal Design of Magnetorheological Mount for Ship Engines : Maximum Damping Force
Park, Joon Hee ; Do, Xuan Phu ; Nguyen, Quoc Hung ; Kang, Ok Hyun ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 5, 2013, Pages 472~478
DOI : 10.5050/KSNVE.2013.23.5.472
This paper presents optimal design procedures of mount based on a magnetorheological(MR) fluid to isolate the vibration in heavy diesel engine system. At first, frequency response and force-displacement transmissibility methods are used to get required damping force that is necessary for effective vibration isolation. From this result, a new type of high damping force engine mount is proposed and the governing equation of Bingham plastic behavior of MR fluid in flow path is mathematically derived under cylindrical coordinates. Finally, parametric design optimization featuring finite element is performed using ANSYS software to get the required damping force in MR mount system which can be used to reduce engine vibration. Damping force of the MR mount is then determined as an objective function in this analysis based on ANSYS. Furthermore, Magnetic analysis is then applied in this process.