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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
Proposition to Natural Frequency of Liquid Column Vibration Absorber with Vertical-horizontal Area Ratio
Woo, Sung-Sik ; Chung, Lan ; Lee, Joung-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 119~126
DOI : 10.5050/KSNVN.2009.19.2.119
LCVA has an advantage that its natural frequency can be easily controlled by changing the area ratio of the vertical column and horizontal part. The previous studies investigated the dynamic characteristics of the LCVA under harmonic load. This study experimentally obtained the first and second mode natural frequencies of the LCVA from shaking table tests using white noise and compared the values with the ones by previous study. Test results show that the measured first mode natural frequency of the LCVA has a different value compared with calculated one. The effective length(
) was revised using by power equation. In the case01 to 19, the standard deviation(
) is 4.7292 and the coefficient of correlation(r) is 0.9856. In the case21 to 61, the standard deviation(
) is 14.2143 and the coefficient of correlation(r) is 0.9935. The second mode frequency increases with the increasing area ratio, which is due to the sloshing motion effect resulting from the large area of the vertical column.
Identify Hypoid Gear Whine Noise for Deflection Test and Transmission Error Measurement
Choi, Byung-Jae ; Oh, Jae-Eung ; Park, Sang-Gil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 127~137
DOI : 10.5050/KSNVN.2009.19.2.127
Hypoid gears are widely used in rear drive and 4WD vehicle axles. Investigation of their sensitivity to deflections is one of the most important aspects of their design and optimization procedures. The deflection test is performed in the actual gear mounting using completely processed gear. This test should cover the full operating range of gear loads from no load to peak load. Under peak load the contact pattern should extend to the tooth boundaries without showing a concentration of the contact pattern at any point on the tooth surface. Transmission error is tested on an axle assembly triaxial real car load condition.
Active Vibration Control of Underwater Hull Structure Using Macro-Fiber Composite Actuators
Kwon, Oh-Cheol ; Sohn, Jung-Woo ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 138~145
DOI : 10.5050/KSNVN.2009.19.2.138
Structural vibration and noise are hot issues in underwater vehicles such as submarines for their survivability. Therefore, active vibration and noise control of submarine, which can be modeled as hull structure, have been conducted by the use of piezoelectric materials. Traditional piezoelectric materials are too brittle and not suitable to curved geometry such as hull structures. Therefore, advanced anisotropic piezocomposite actuator named as Macro-Fiber Composite(MFC), which can provide great flexibility, large induced strain and directional actuating force is adopted for this research. In this study, dynamic model of the smart hull structure is established and active vibration control performance of the smart hull structure is evaluated using optimally placed MFC. Actuating performance of MFC is evaluated by finite element analysis and dynamic modeling of the smart hull structure is derived by finite element method considering underwater condition. In order to suppress the vibration of hull structure, Linear Quadratic Gaussian(LQG) algorithm is adopted. After then active vibration control performance of the proposed smart hull structure is evaluated with computer simulation and experimental investigation in underwater. Structural vibration of the hull structure is decreased effectively by applying proper control voltages to the MFC actuators.
Dynamic Response of Hull Mounted Cylindrical Array Sonars to Shocks
Shin, Chang-Joo ; Hong, Chin-Suk ; Jeong, Weui-Bong ; Seo, Hee-Seon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 146~154
DOI : 10.5050/KSNVN.2009.19.2.146
Dynamic response of a hull mounted sonar(HMS) to shocks transmitted through hull structures is analyzed and then the structural reliability of the sonars is evaluated. Finite element model of the hull mounted sonar is established and the transient responses to the shock is calculated using MSC.NASTRAN. According to BV043, the maximum allowable accelerations at the foundation of the sonar are converted from the shock spectra allowable for HMS. They are applied vertically and horizontally, respectively, using the large mass method. The structural reliability is evaluated by comparing the von-Mises stresses with the material yield stress. The drum for sensors shows a high reliability owing to mounts by which the shock waves from the base structure are well protected. However, the mounts between the base structure and the drum to mount sensors show a high stress intensity. The base structure also reveals a high stress intensity at the connection points to the hull.
Development of Engine Vibration Analysis and Monitoring System(EVAMOS) for Marine Vessels
Lee, D.C. ; Joo, K.S. ; Nam, T.K. ; Kim, E.S. ; Kim, S.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 155~161
DOI : 10.5050/KSNVN.2009.19.2.155
Engine builders have separately developed and applied torsional, axial and structural vibration monitoring system on most marine engines. These systems displayed their results for engine or ship operation engineers and were not regularly stored at the hardware of computer. So, the history and trend of various engine and hull vibrations were not supported for preventive maintenance and to protect the failure of these activity or function. The integrated vibration or stress monitoring system(EVAMOS : engine vibration analysis and monitoring system) in marine diesel engine, its accessories and hull structure have been developed by the dynamics laboratory of Mokpo Maritime University during last 3 years. This paper introduces the design conception and ability of commercial software EVAMOS with field data on several actual tests.
The Numerical Analysis of Heavy Weight Impact Noise for an Apartment House
Hwang, Jae-Seung ; Moon, Dae-Ho ; Park, Hong-Gun ; Hong, Sung-Gul ; Hong, Geon-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 162~168
DOI : 10.5050/KSNVN.2009.19.2.162
In this study, numerical analysis is performed to investigate the sound radiation characteristics of an apartment house according to the type of the slab system. In order to satisfy the boundary condition of the apartment house, the whole floor is modelled with FEM model for three different structural system: wall, RC, flat slab system. From the analytical results, it is shown that heavy weight floor impact noise of wall type slab is larger than that of the other slab systems and the noise radiated from the wall have great effect on the sound pressure level. The results also show that the vibration energy of RC or flat slab system is widely distributed over the whole slab, which is main reason that the noise induced by the slab systems is reduced in comparison with wall slab system.
Precise Position Control of Inchworm Using Robust Control Technique and Input Shaping
Yang, Kwang-Yong ; Hwang, Yun-Sik ; Kim, Yeung-Shik ; Kim, In-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 169~175
DOI : 10.5050/KSNVN.2009.19.2.169
This paper presents motion control of the Inchworm composed of the piezoelectric actuators and mechanical elements. Piezoelectric actuator shows nonlinear response characteristics including hysteresis due to the ferroelectric characteristics. This paper proposes feedback control scheme to improve the ability of tracking response to complex input signal and suppress the phenomenon of hysteresis using the sliding mode control technique with the integrator. The sliding mode control system has the limit to minimize both the settle time and overshoot. For making up this limit, this paper also suggests input shaping technique suitable to the inchworm control system.
Study on Effective Noise Management Plan of Construction Site
Sun, Hyo-Sung ; Park, Young-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 176~183
DOI : 10.5050/KSNVN.2009.19.2.176
The objective of this study is to prepare the plans for managing construction noise effectively and solving the popular enmity from construction noise reasonably. In order to carry out this purpose, it covers the efficient improvement plans for adjusting the construction noise regulation standard rationally and managing the automatic noise measuring system which shows the advantage for construction noise management and popular enmity solution due to construction noise. The three alternative plans of the construction noise regulation standard and the recommendation plan including the guideline for installing and managing the automatic noise measuring system are suggested consequently.
Small-size Specimen's Effectiveness That is Used to Mortar Layer of Slab (Heavy-weight Floor Impact Sound)
Chung, Jin-Yun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 184~191
DOI : 10.5050/KSNVN.2009.19.2.184
This study examined small-size specimen's effectiveness that is used to evaluate floor impact sound performance. Floor impact sound level of small-size specimen is higher than full-size. This is due to excessive impact power of Bang machine. Impact hammer that has small impact power relatively can solve this problem. But, according to the size of specimen, mode shape and frequency that influence to structural borne sound is changed. Slab mode of full-size specimen was changed to frequency design of resilient materials. But in case of small-size specimen, there is no change of vibration mode by resilient materials change, Vibration mode of small-size specimen is the same. Therefore, it is not proper that use small-size specimen in floor impact sound estimation.
Free Vibration Analysis of a Simply-supported Circular Plate with a Concentric Square Hole by the Independent Coordinate Coupling Method
Heo, Seok ; Kwak, Moon-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 192~199
DOI : 10.5050/KSNVN.2009.19.2.192
This paper presents the free vibration analysis of a circular plate with a concentric square hole. The boundary condition is the edge of the square hole is free and the outer circular plate is simply supported. Due to the geometric abnormality, this analysis does not permit an exact solution. The present problem deals with the numerical calculation of the natural frequencies and mode shapes of vibration of the structure by independent coordinate coupling method(ICCM). The numerical results show the efficacy of the ICCM and changes in natural frequencies and modes due to the square hole size.
Dynamic Analysis of a System Using Reduced Modeling of Substructures
Hwang, Woo-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 200~207
DOI : 10.5050/KSNVN.2009.19.2.200
Complex systems are made of many subsystems, those are developed and manufactured by many part companies. Even though the information for a part is necessary to analyze the performance of the other part, it is not so easy to get the information for that part from other companies due to many reasons like security or compatibilities. If the modal parameters of a system between the connecting points are available, we can reconstruct a reduced model for that system in a physical coordinate not in a generalized coordinate. The assemble of the equations of motion for the main system and the reduced equations of motion for the connected system can give a response of the main system considering the effects of connected systems. The results show that the proposed method can give the response of a system accurately. The rule for the selection of modes is to use the fundamental modes whose natural frequencies are low.
In-plane Natural Vibration Analysis of a Rotating Annular Disk
Song, Seung-Gwan ; Kwak, Dong-Hee ; Kim, Chang-Boo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 208~216
DOI : 10.5050/KSNVN.2009.19.2.208
In this paper, we present the equations of motion by which the natural vibration of a rotating annular disk can be analyzed accurately. These equations are derived from the theory of finite deformation and the principle of virtual work. The radial displacements of annular disk at the steady state where the disk is rotating at a constant angular velocity are determined by non-linear static equations formulated with 1-dimensional finite elements in radial direction. The linearlized equations of the in-plane vibrations at the disturbed state are also formulated with 1-dimensional finite elements in radial direction along the number of nodal diameters. They are expressed as in functions of the radial displacements at the steady state and the disturbed displacements about the steady state. In-plane static deformation modes of an annular disk are used as the displacement functions for the interpolation functions of the 1-dimensional finite elements. The natural vibrations of an annular disk with different boundary conditions are analyzed by using the presented model and the 3-dimensional finite element model to verify accuracy of the presented equations of motion. Its results are compared and discussed.
Estimation of Anti-vibration Glove Performance Considering the Vibration Characteristic of Power Tool through Development of Flexible Palm Adapter
Song, Chi-Mun ; Jang, Han-Kee ; Hong, Seok-In ; Chai, Jang-Bom ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 19, issue 2, 2009, Pages 217~224
DOI : 10.5050/KSNVN.2009.19.2.217
This study aims to show the guideline to select optimal anti-vibration gloves for specific power tools to prevent hazardous vibration to human body. It is most desirable for the correct evaluation of handtransmitted vibration form the power tool handle to measure the acceleration between the handle surface and the hand palm as recommended in ISO 5349-1. First, the accurate acceleration measurement device was developed of which the thickness and weight were less than 6 mm and 12 g respectively so that it can be placed between the handle and the palm without any inconvenience during the measurement. Finally, using the device we estimated anti-vibration glove performances considering the frequency characteristics of generated vibration by the power tool.