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 15, Issue 12 - Dec 2005
Volume 15, Issue 11 - Nov 2005
Volume 15, Issue 10 - Oct 2005
Volume 15, Issue 9 - Sep 2005
Volume 15, Issue 8 - Aug 2005
Volume 15, Issue 7 - Jul 2005
Volume 15, Issue 6 - Jun 2005
Volume 15, Issue 5 - May 2005
Volume 15, Issue 4 - Apr 2005
Volume 15, Issue 3 - Mar 2005
Volume 15, Issue 2 - Feb 2005
Volume 15, Issue 1 - Jan 2005
Selecting the target year
A Study on the Shape Design of Micro Speaker Diaphragm
Hong, Do-Kwa ; Woo, Byung-Chul ; Kim, Dong-Young ; Ahn, Chan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 775~780
DOI : 10.5050/KSNVN.2005.15.7.775
This study uses a characteristic function to explain correlations between the objective function and design variables. Analysis of means and table of orthogonal array were carried out. The change of shape of diaphragm, thickness of diaphragm and voice coil weight based on the table of orthogonal array Is made. Therefore this study carried to decide design variables for minimizing 1st natural frequency and maximizing 2nd natural frequency of diaphragm using design of experiments and characteristic function with constraints. we showed improved design variables.
Diagnosis on the Clearance of Rotating Machinery Using Correlation Dimension
Park, Sang-Moon ; Choi, Yeon-Sun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 781~787
DOI : 10.5050/KSNVN.2005.15.7.781
The correlation dimension can provide some intrinsic Information of an underlying dynamic system by reconstructing measured nonlinear time series. The vibration signals measured from a rotor with different clearance sizes between shaft and bushing were analyzed using the correlation dimension. The results showed that the correlation dimension can identify the size of the clearance of a rotor and the lubricating condition, which can not be analyzed by frequency spectrum or wavelet. The magnitude of the correlation dimension became smaller as the clearance larger and as the lubrication condition better.
Numerical Method for Prediction of Air-pumping Noise by Car Tyre
Kim, Sungtae ; Jeong, Wontae ; Cheong, Cheolung ; Lee, Soogab ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 788~798
DOI : 10.5050/KSNVN.2005.15.7.788
The monopole theory has long been used to model air-pumped effect from the elastic cavities in car tire. This approach models the change of an air as a Piston moving backward and forward on a spring and equates local air movements exactly with the volume changes of the system. Thus, the monopole theory has a restricted domain of applicability due to the usual assumption of a small amplitude acoustic wave equation and acoustic monopole theory This paper describes an approach to predict the air-pumping noise of a car tyre with CFD/Kirchhoff integral method. The tyre groove is simply modeled as piston-cavity-sliding door geometry and with the aid of CFD technique flow properties in the groove of rolling car tyre are acquired.`rhese unsteady flow data are used as a air-pumping source in the next CFD calculation of full tyre-road geometry. Acoustic far field is predicted from Kirchhoff integral method by using unsteady flow data in space and time which is provided by the CFD calculation of full tyre-road domain. This approach can cover the non-linearity of acoustic monopole theory with the aid of Non-linear governing equation in CFD calculation. The method proposed in this paper is applied to the prediction of air-pumping noise of simply modeled car tyre and through the predicted results, the influence of nonlinear effect on air-pumping noise propagation is investigated.
A Study on the Development of High Stiffness Body for Suspension Performance
Kim, Ki-Chang ; Kim, Chan-Mook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 799~805
DOI : 10.5050/KSNVN.2005.15.7.799
This paper describes the development process of high stiffness body for ride and handling performance. High stiffness and light weight vehicle is a major target in the refinement of Passenger cars to meet customers` contradictable requirements between ride and handling performance and fuel economy This paper describes the analysis approach process for high stiffness body through the data level of body stiffness. According to the frequency band. we can suggest the design guideline about lg cornering static stiffness, torsional and lateral stiffness, body attachment stiffness. The ride and handling characteristic of a vehicle Is significantly affected by vibration transferred to the body through the chassis mounting points from front and rear suspension. It is known that body attachment stiffness is an important factor of ride and handling performance improvement. And high stiffness helps to improve the flexibility of bushing rate tuning between handling and road noise. It makes possible to design the good handling performance vehicle and save vehicles to be used in tests by using mother car at initial design stage. These improvements can lead to shortening the time needed to develop better vehicles.
A Study on the Dynamic Behavior of Concrete Dam by Shaking Table Tests
Hwang, Seong-chun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 806~812
DOI : 10.5050/KSNVN.2005.15.7.806
This paper adresses the shaking table tests with 1/100 scaled model followed similitude law for OOdam main designing section to understand nonlinear behavior characteristics of concrete dam body by ground motion. As earthquake wave, Hachinohe and El Centre waves were used and acceleration and displacements are measured to analyze behaviors of dam body. For maximum ground acceleration range
, the results showed linear behavior regardless of maximum 9round acceleration and secured safety of structure. To analyze the behavior of dam after tension cracking, 3 cm-notch was placed at the critical section of over-flowing section. As results of applying Hachinohe wave(0.8 g), Even though tension cracks were formed at over-flowing section by Hachinohe wave(0.8 g), it showed that the dam is stable for supporting upper stream Part of water tank of dam.
Model Establishment of a Deployable Missile Control Fin Using Substructure Synthesis Method
Kim, Dae-Kwan ; Bae, Jae-Sung ; Lee, In ; Han, Jae-Hung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 813~820
DOI : 10.5050/KSNVN.2005.15.7.813
A deployable missile control fin has some structural nonlinearities because of the worn or loose hinges and the manufacturing tolerance. The structural nonlinearity cannot be eliminated completely, and exerts significant effects on the static and dynamic characteristics of the control fin. Thus, It is important to establish the accurate deployable missile control fin model. In the present study, the nonlinear dynamic model of 4he deployable missile control fin is developed using a substructure synthesis method. The deployable missile control fin can be subdivided Into two substructures represented by linear dynamic models and a nonlinear hinge with structural nonlinearities. The nonlinear hinge model is established by using a system identification method, and the substructure modes are improved using the Frequency Response Method. A substructure synthesis method Is expanded to couple the substructure models and the nonlinear hinge model, and the nonlinear dynamic model of the fin is developed. Finally, the established nonlinear dynamic model of the deployable missile control fin is verified by dynamic tests. The established model is In good agreement with test results, showing that the present approach is useful in aeroelastic stability analyses such as time-domain nonlinear flutter analysis.
Development of Index for Sound Quality Evaluation of Vacuum Cleaner Based on Human Sensibility Engineering
Gu, Jin-Hoi ; Lee, Sang-kwon ; Jeon, Wan-Ho ; Kim, Chang-Jun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 821~828
DOI : 10.5050/KSNVN.2005.15.7.821
In our life, we have used many digital appliances. They help us to improve the quality of life but sometimes give us unsatisfactory result. Because they produce specific noise. Especially vacuum cleaner produce much noise that is very annoying. So we need to study what sound metrics affect human sensibility. In this paper, we develop sound quality index for vacuum cleaner using the sound quality metrics defined in psychoacoustics. First, we carry out the subjective evaluation of vacuum cleaner sound to verify what vacuum sound feels good to human. And then artificial neural network estimated the complexity and the nonlinear characteristics of the relations between subjective evaluation and sound metrics. Finally the ANN is trained repeatedly to have a good performance for sound qualify index of the vacuum cleaner. As a result, the sound quality index of vacuum cleaner has a correlation of
between the subjective evaluation and ANN. So, there exist three factors that Is loudness, sharpness, roughness which affect the sound quality of vacuum cleaner.
Optimal Treatment of Unconstrained Visco-elastic Damping Layer on Beam to Minimize Vibration Responses
Lee, Doo-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 829~835
DOI : 10.5050/KSNVN.2005.15.7.829
An optimization formulation of unconstrained damping treatment on beam is proposed to minimize vibration responses using a numerical search method. The fractional derivative model is combined with RUK`s equivalent stiffness approach in order to represent nonlinearity of complex modulus of damping materials with frequency and temperature. Vibration responses are calculated by using the modal superposition principle, and of which design sensitivity formula with respect to damping layout is derived analytically. Plugging the sensitivity formula into optimization software, we can determine optimally damping treatment region that gives minimum forced response under a given boundary condition. A numerical example shows that the proposed method is very effective in suppressing nitration responses by means of unconstrained damping layer treatment.
Thermopiezoelastic Nonlinear Dynamic Characteristics of Piezolaminated Plates
Oh, Il-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 836~842
DOI : 10.5050/KSNVN.2005.15.7.836
Nonlinear dynamic characteristics of active piezolaminated plates are investigated with respect to the thermopiezoelastic behaviors. For largely deformed structures with small strain, the incremental total Lagrangian formulation is presented based on the virtual work principles. A multi-field layer-wise finite shell element is proposed for assuring high accuracy and non-linearity of displacement, electric and thermal fields. For dynamic consideration of thermopiezoelastic snap-through phenomena, the implicit Newmark`s scheme with the Newton-Raphson iteration is implemented for the transient response of various piezolaminated models with symmetric or eccentric active layers. The bifurcate thermal buckling of symmetric structural models is first investigated and the characteristics of piezoelectric active responses are studied for finding snap-through piezoelectric potentials and the load-path tracking map. The thermoelastic stable and unstable postbuckling, thermopiezoelastic snap-through phenomena with several attractors are proved using the nonlinear time responses for various initial conditions and damping loss factors. Present results show that thermopiezoelastic snap-through phenomena can result in the difficulty of buckling and postbuckling control of intelligent structures.
Whirl Flutter Analysis of a 2-DOF Rotor-Nacelle System Using Quasisteady Aerodynamic Theory
Kim, Dong-Hyun ; Yang, Yong-Joon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 843~850
DOI : 10.5050/KSNVN.2005.15.7.843
In this study, simplified whirl flutter analyses using quasisteady aerodynamic theory have been Performed for a 2-DOF tiIt-rotor system with both pitch and Yaw motions of a rotor-nacelle. The present dynamic system consists of the rotor (propeller) , forming the gyroscopic and aerodynamic element, supported horizontally by a pylon that is pivoted at some wing attachment point. Several design parameters for rotor-nacelle system are considered to practically investigate the effects of whirl flutter stability.
One to One Resonance on the Quadrangle Cantilever Beam
Kim, Myoung-Gu ; Pak, Chul-Hui ; Cho, Chong-Du ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 851~858
DOI : 10.5050/KSNVN.2005.15.7.851
The response characteristics of one to one resonance on the quadrangle cantilever beam in which basic harmonic excitations are applied by nonlinear coupled differential-integral equations are studied. This equations have 3-dimensional non-linearity of nonlinear inertia and nonlinear curvature. Galerkin and multi scale methods are used for theoretical approach to one-to-one internal resonance. Nonlinear response characteristics of 1st, 2nd, 3rd modes are measured from the experiment for basic harmonic excitation. From the experimental result, geometrical terms of non-linearity display light spring effect and these terms play an important role in the response characteristics of low frequency modes. Nonlinear nitration in the out of plane are also studied.
A Study on the Assessment Method of Noise Exposure Population Using the Over-ride Value Noise Map
Park, In-Sun ; Park, Sang-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 859~864
DOI : 10.5050/KSNVN.2005.15.7.859
Noise map is a presentation of existing data or predicted noise situation in terms of noise indicator. However, it has shortcoming for assessing the number of people exposed, or the number of dwellings affected to any relevant limit values of noise level in certain areas. In this study, so called over-ride value noise mapping is Proposed to make up for the shortcoming by using over-ride function of object-oriented programming and it is to show the guard of the area where it is satisfied the standard of option, or it is not satisfactory. Over-ride value noise map data is combined with topography layer, population and house statistics, and GIS space statistical analysis. The over-ride value noise mapping can also be applied to make the road traffic noise map, the railroad noise map, the aircraft noise map, and the industrial site noise map. This can express noise damage information more exactly.
An Experimental Study on the Torsional Excitation Source of the Vehicle Driveline
Chang, Il-Do ; Kim, Byoung-Sam ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 865~870
DOI : 10.5050/KSNVN.2005.15.7.865
Torque fluctuation of the engine and angular velocity variation of propeller shaft is the main excitation source for torsional vibration in the vehicle driveline. Experimental model for engine system is constructed with 4 cylinder 4 cycle diesel engine including Motor-Propeller Shaft-Axle-Wheel system. The angular velocity is measured by magnetic pickup and FV converter at the engine flywheel and propeller shaft. This paper presents the theoretical mechanism of these excitation sources and it is identified by the experimental methods.
Modeling and Motion Control of the Piezoelectric Actuator for the Inchworm: Part 1. Hysteresis Modeling of the Piezoelectric Actuator
Kim, In-Soo ; Kim, Gibum ; Kim, Young-Shik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 871~877
DOI : 10.5050/KSNVN.2005.15.7.871
This paper proposes a new modeling scheme to describe the hysteresis between input voltage and displacement of piezoelectric actuators in the inchworm. From the experimental analysis of Piezoelectric actuator behaviors. the hysteresis characteristics including residual displacement can be modeled by second order functions of a maximum Input voltage and preload. Various experiments are performed to demonstrate the effectiveness and validation of the proposed modeling scheme.
Modeling and Motion Control of Piezoelectric Actuator for the Inchworm : Part 2. Motion Control of Inchworm Using Sliding Mode Method
Kim, Young-Shik ; Park, Euncheol ; Kim, In-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 15, issue 7, 2005, Pages 878~884
DOI : 10.5050/KSNVN.2005.15.7.878
This paper presents an algorithm for the precision motion control based on the dynamic characteristics of piezoelectric actuators in the inchworm. The dynamic characteristics are identified by the frequency domain modeling technique using the experimental data. For the motion control, the hysteresis behavior is compensated by the inverse hysteresis model. The dynamic stiffness of an inchworm is generally low compared to its driving condition, so mechanical vibration may degenerate the motion accuracy of the inchworm. The Sliding mode controller and the Kalman filter are designed for motion control of the inch-worm.