Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korean Society for Noise and Vibration Engineering
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
Editor in Chief :
Volume & Issues
Volume 13, Issue 12 - Dec 2003
Volume 13, Issue 11 - Nov 2003
Volume 13, Issue 10 - Oct 2003
Volume 13, Issue 9 - Sep 2003
Volume 13, Issue 8 - Aug 2003
Volume 13, Issue 7 - Jul 2003
Volume 13, Issue 6 - Jun 2003
Volume 13, Issue 5 - May 2003
Volume 13, Issue 4 - Apr 2003
Volume 13, Issue 3 - Mar 2003
Volume 13, Issue 2 - Feb 2003
Volume 13, Issue 1 - Jan 2003
Selecting the target year
The Effect of Damping of a Two-degree-of-freedom Model for the Disc Brake Squeal Noise
Shin, Ki-Hong ; Joe, Yong-Goo ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 903~910
DOI : 10.5050/KSNVN.2003.13.12.903
A two-degree-of-freedom model is suggested to describe basic dynamical behaviors of the interaction between the pad and the disc of a disc brake system. Although a pad (and a disc) has many modes of vibration in practice, only one mode of each component Is considered. In this paper, a linear analysis is performed by means of the stability analysis to show various conditions for the system to become unstable, and is based on the assumption that the existence of limit cycle (this corresponds to an unstable equilibrium point inside the limit cycle) represents the squeal state of the disc brake system. The results of the stability analysis show that the damping of the disc is as much Important as that of the pad, whereas the damping of the pad only is considered In most practical situations.
Vibration Localization of Open Loop Repeated Structures
Ha, Dong-Jin ; Yoo, Hong-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 911~917
DOI : 10.5050/KSNVN.2003.13.12.911
Vibration localization characteristics of open loop repeated mistuned structures are investigated. The mistuning often creates significant response discrepancies among subcomponents of the repeated structures. As a result of the discrepancies, critical fatigue problems often occur in repeated structures. Therefore. it is of great importance to predict the vibration response of the mistuned repeated structures accurately in this Paper, a simplified model for an open-loop repeated structure is introduced and dimensionless parameters that influence the localization characteristics are identified. The effects of the parameters on the localization characteristics are investigated through numerical study.
Identification Method of the Dynamic Characteristics of Pre-deformed Elastomers
Ahn, Tae-Kil ; Kim, Kug-Weon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 918~922
DOI : 10.5050/KSNVN.2003.13.12.918
Elastomers are extensively used in various machine design application, mainly for vibration/shock/noise control devices. However. there are still a lot of difficulties in designing the elastomeric components applied in complex shapes and under pre-deformed states. One of the most Influential factors related to mechanical properties of elastomers are pre- and dynamic strains. Consequently, a large number of experiments have to be conducted to identify dynamic properties of elastomers considering their combined effects. In this paper, we present an efficient experimental method to identify mechanical properties of elastomers considering effects of pre- and dynamic strains. This method is capable of predicting the dynamic characteristics of elastomers under arbitrary strain states from reduced experimental data.
Improvement of Dynamic Characteristics of Torsion on the Marine Propulsion Shafting System with Elastic Rubber Coupling
Lee, D.C. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 923~929
DOI : 10.5050/KSNVN.2003.13.12.923
As for the marine propulsion shafting system using 4 stroke diesel engine, it is common to apply a reduction gear box between diesel engine and shafting to increase propulsion efficiency, which requires inevitably a certain elastic coupling to avoid chattering and hammering inside of gear box. In this study, the optimum method of rectifying propulsion shafting system in case of 750 ton fishing vessel is theoretically studied in a view of dynamic characteristics of torsion. After the replacement of diesel engine and gear box, the torsional vibration get worse and so some countermeasures are needed. The elastic coupling is modified from a present rubber coupling of block type having relatively high torsional stiffness to a rubber coupling haying two serially connected elements. Torsional vibration damper was installed at crankshaft free end additionally and moment of inertia of flywheel was adjusted. The dynamic characteristics of shafting system was improved by these modification. The theoretical analysis of torsional vibration are compared to measurement results using two laser torsion meters during the sea trial.
Selection of Connection Position to Change Dynamic Characteristic of Structure
Kim, Kyung-Won ; Park, Youn-Sik ; Kim, Sung-Hoon ; Kim, Jin-Hee ; Rhee, Ju-Hun ; Hwang, Do-Soon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 930~937
DOI : 10.5050/KSNVN.2003.13.12.930
This research deals with how to select connection positions of two substructures to be synthesized. The goal of this research is to find optimal connection positions in order to maximize the fundamental natural frequency of the synthesized structure. The natural frequencies of a connected structure are obtained by modal-force equations. Optimal connection positions can be selected through optimization process. In the optimization process, the natural frequencies of a connected structure are set to object function value and connection positions become design variables. The method described above is applied to synthesis problems of plates, which is initially conducted for FE models and verified through experiments. Especially in experiments. FRF(frequency response function) s are obtained by means of the Modal Testing technique to be used in modal-force equations for synthesizing. Once the substructures are synthesized. the Modal Testing technique is again applied to spot-welded structure using the result from the optimization procedure. It is found that the fundamental natural frequency of the synthesized structure with the optimized result gives higher value than those with the initially given connection positions.
Length Optimization for Unconstrained Visco-elastic Damping Layer of Beams
Lee, Doo-Ho ; Hwang, Woo-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 938~946
DOI : 10.5050/KSNVN.2003.13.12.938
Length of an unconstrained viscoelastic damping layer on beams is determined to maximizeloss factor using a numerical search method. The fractional derivative model can describe damping characteristics of viscoelastic damping materials accurately, and is used to represent nonlinearity of complex modulus with frequencies and temperatures. Equivalent flexural rigidity of the unconstrained beam is obtained using Ross, Ungar, Kelvin[RUK] equation. The loss factors of partially covered unconstrained beam are calculated by a modal strain energy method. Optimal lengths of the unconstrained viscoelastic damping layer of beams are identified with ambient temperatures and thickness ratios of beam and damping layer by using a finite-difference-based steepest descent method.
Stability Analysis of Stiffened Plates on Elastic Foundations
Lee, Byoung-Koo ; Lee, Yong-Soo ; Oh, Soog-Kyoung ; Lee, Tae-Eun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 947~955
DOI : 10.5050/KSNVN.2003.13.12.947
This research analyzes the dynamic stability of stiffened plates on elastic foundations using the finite element method. For analyzing the stiffened plates, both the Mindlin plate theory and Timoshenko beam-column theory were applied. In application of the finite element method, 8-nodes serendipity element system and 3-nodes finite element system were used for plate and beam elements, respectively Elastic foundations were modeled as the Pasternak foundations in which the continuity effect of foundation is considered. In order to verify the theory of this study, solutions obtained by this analysis were compared with the classical solutions in open literature and experimental solutions. The dynamic stability legions of stiffened plates on Pasternak foundations were determined according to changes of in-plane stresses, foundation parameters and dimensions of stiffener.
Eigenvalue Branches and Flutter Modes of a Cantilevered Pipe Conveying Fluid and Having a Tip Mass
Ryu, B.J. ; Ryu, S.U. ; Lee, J.W. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 956~964
DOI : 10.5050/KSNVN.2003.13.12.956
The paper describes the relationship between the eigenvalue branches and the corresponding flutter modes of cantilevered pipes with a tip mass conveying fluid. Governing equations of motion are derived by extended Hamilton`s principle, and the numerical scheme using finite element method is applied to obtain the discretized equations. The flutter configurations of the pipes at the critical flow velocities are drawn graphically at every twelfth period to define the order of quasi-mode of flutter configuration. The critical mass ratios, at which the transference of the eigenvalue branches related to flutter takes place. are definitely determined. Also, in the case of haying internal damping, the critical tip mass ratios, at which the consistency between eigenvalue braches and quasi-modes occurs. are thoroughly obtained.
Controller Design of Piezoelectric Milliactuator for Dual Stage System
Eo-Jin, Hong ; No-Cheol, Park ; Hyun-Seok, Yang ; Young-Pil, Park ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 13, issue 12, 2003, Pages 965~971
DOI : 10.5050/KSNVN.2003.13.12.965
To reach high areal density, less track pitch is expected and more servo bandwidth is required. One approach to overcoming the problem is by using dual stage servo system. For this system. we have suggested new milliactuator based on the shear mode of piezoelectric elements to drive the head suspension assembly. In this paper, we introduce milliactuator and controller design method, PQ method. PQ method reduces the controller design problem for DISO (dual-input/single-output) systems to two standard controller design problems for SISO ( single-input/single-output) problems. The first part of PQ method directly addresses the issue of actuator output contribution, and the second part allows the use of traditional loop shaping to achieve the overall system performance. This paper shows how to employ the PQ method to meet aggressive close-loop performance specifications for a disk drive system with a VCM and piezoelectric milliactuator.