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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
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Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 18, Issue 12 - Dec 2008
Volume 18, Issue 11 - Nov 2008
Volume 18, Issue 10 - Oct 2008
Volume 18, Issue 9 - Sep 2008
Volume 18, Issue 8 - Aug 2008
Volume 18, Issue 7 - Jul 2008
Volume 18, Issue 6 - Jun 2008
Volume 18, Issue 5 - May 2008
Volume 18, Issue 4 - Apr 2008
Volume 18, Issue 3 - Mar 2008
Volume 18, Issue 2 - Feb 2008
Volume 18, Issue 1 - Jan 2008
Selecting the target year
Optimum Working Condition of Side Wall End Milling Using Response Surface Methodology
Hong, Do-Kwan ; Choi, Jae-Gi ; Park, Jin-Woo ; Baek, Hwang-Soon ; Ahn, Chan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1097~1104
DOI : 10.5050/KSNVN.2008.18.11.1097
Working condition is one of the most important factors in precision working. In this study, we optimized the vibration acceleration of working progress direction using RSM(response surface methodology) by table of orthogonal array. RSM was well adapted to make analytic model for minimizing vibration acceleration, created the objective function and saved a great deal of computational time. Therefore, it is expected that the proposed optimization procedure using RSM can be easily utilized to solve the optimization problem of working condition. The experimental results of the surface roughness and vibration acceleration showed the validity of the proposed working condition of side wall end-milling as it can be observed.
Active Vibration Control Using Saturated LQR Controller
Lim, Chae-Wook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1105~1110
DOI : 10.5050/KSNVN.2008.18.11.1105
In this paper, a saturated LQR controller considering control input`s saturation for stable linear time-invariant systems with single control input is studied. Based on Lyapunov stability, two linear matrix inequality sufficient existence conditions for this controller are presented. Through numerical simulations for 2DOF vibrating system, it is confirmed that the saturated LQR controller is stable in the presence of control input`s saturation and it is also shown that this controller can be applied to vibrating system practically.
Study on the Integration Stability and the Accuracy of Some Friction Models for the Dynamic Analysis Using Recurdyn
Yoo, Hong-Hee ; Lee, Jun-Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1111~1117
DOI : 10.5050/KSNVN.2008.18.11.1111
During the dynamic analysis of a system, the Coulomb friction law is emploved to calculate the friction force. Since the static friction coefficient is only employed during the zero relative velocity, it is impractical to employ the coefficient during the dynamic analysis. To calculate the static friction force, therefore, some friction models have been developed. In this study, the integration stability and the accuracy of the models are investigated with some numerical examples. The effect of time step size during the numerical integration is also investigated. The numerical study shows that the friction model employed for most commercial codes is not as good as the one proposed in this study.
Topology-optimization-based Partition Design for Maximizing or Minimizing the Eigenfrequency of a Double Cavity
Lee, Jin-Woo ; Kim, Yoon-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1118~1127
DOI : 10.5050/KSNVN.2008.18.11.1118
The position and size of holes in the partition of a double cavity are known to strongly affect the eigenfrequency of the longitudinal eigenmodes of the double cavity. To maximize or minimize the eigenfrequency of the hole-partitioned double cavity, two acoustical topology optimization problems are formulated and solved. While two sub-cavities are filled with air, a partition between them is assumed to consist of sub-partitions of variable acoustical properties. One design variable is assigned to each sub-partition, whose material properties are interpolated as those of an intermediate material between air and a rigid body. The penalty parameter of the used interpolation function is adjusted to obtain a distinct air and rigid body distribution at the converged stage in each acoustical topology optimization problem. A special attention is paid to the selection of initial values of design variables to obtain solutions as close to global optimum and symmetric as possible. To show numerical characteristics of these optimization problems, the formulated problems are first solved for the one-dimensional partition design domain and then for the two-dimensional partition design domain.
Surface Acoustic Wave Sensor Using Electroactive Paper(EAPap)
Lee, Min-Hee ; Kim, Joo-Hyung ; Kim, Jae-Hwan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1128~1133
DOI : 10.5050/KSNVN.2008.18.11.1128
Cellulose based electroactive paper(EAPap) has been developed as a new smart material due to its advantages of piezoelectricity, large displacement, low power consumption, low cost and flexibility. EAPap can be used for a surface acoustic wave (SAW) device using the piezoelectric property of EAPap, resulting in the cost effective and flexible SAW device. In this paper, inter digit transducer(IDT) structure using lift-off technique with a finger gap of 10mm was used for micro fabrication of the cellulose EAPap SAW devices. The performance of IDT patterned SAW device was characterized by a Network Analyzer. The feasibility of cellulose EAPap as a potential acoustic device was presented and explained.
Micro-positioning of a Smart Structure Using an Enhanced Stick-slip Model
Lee, Chul-Hee ; Jang, Min-Gyu ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1134~1142
DOI : 10.5050/KSNVN.2008.18.11.1134
In this paper, a model-based stick-slip compensation for the micro-positioning is proposed using an enhanced stick-slip model based on statistical rough surface contact model. The smart structure is comprised with PZT(lead (Pb) zirconia(Zr) Titanate(Ti)) based stack actuator incorporating with the PID(proportional-integral-derivative) control algorithm, mechanical displacement amplifier and positioning devices. For the stick-slip compensation, the elastic-plastic static friction model is used considering the elastic-plastic asperity contact in the rough surfaces statistically. Mathematical model of system for the positioning apparatus was derived from the dynamic behaviors of structural parts. PID feedback control algorithms with the developed stick-slip model as well as feedforward friction compensator are formulated for achieving the accurate positioning performance. Experimental results are provided to show the performances of friction control using the developed positioning apparatus.
Source Localization Technique for Metallic Impact Source by Using Phase Delay between Different Type Sensors
Choi, Kyoung-Sik ; Choi, Young-Chul ; Park, Jin-Ho ; Kim, Whan-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1143~1149
DOI : 10.5050/KSNVN.2008.18.11.1143
In a nuclear power plant, loose part monitoring and its diagnostic technique is one of the major issues for ensuring the structural integrity of the reactor system. Typically, accelerometers are mounted on the surface of a reactor vessel to localize impact location cavsed by the impact of metallic substances on the reactor system. However, in some cases, the number of the accelerometers is not enough to estimate the impact location precisely. In such a case, one of alternative plan is to utilize another type sensors that can measure the vibration of the reactor structure even though the measuring frequency ranges are different from each others. The AE sensors installed on the reactor structure can be utilized as additional sensors for loose part monitoring. In this paper, we proposed a new method to estimate impact location by using both accelerometer signal and AE signal, simultaneously. The feasibility of the proposed method is verified by an experiment. The experimental results demonstrate that we can enhance the reliability and precision of the loose part monitoring.
Active Vibration Control of Automotive Engine Mount Using MR Fluid and Piezostack
Choi, Sang-Min ; Nguyen, Vien-Quoc ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1150~1156
DOI : 10.5050/KSNVN.2008.18.11.1150
This paper presents vibration control of an active hybrid engine mount featuring a magneto-rheological(MR) fluid and a piezostack actuator. The MR fluid is adopted to improve isolation performance at resonant frequencies, while the piezostack actuator is adopted for performance improvement at non-resonant frequencies, especially at high frequencies. Based on some particular practical requirements of engine mounts, the proposed mount is designed and manufactured. The characteristics of rubber element, piezostack actuator and MR fluid are verified for system analysis and controller synthesis. The dynamic model of the proposed mount with a supported mass (engine) is established. In this work, a sliding mode controller is synthesized for the mount system to reduce vibrations transmitted from the engine in a wide frequency range. Computer simulations are performed to evaluate control performances of the proposed active engine mount in time and frequency domains.
Spectral Element Formulation for Analysis of Lamb Wave Propagation on a Plate Induced by Surface Bonded PZT Transducers
Lim, Ki-Lyong ; Kim, Eun-Jin ; Kang, Joo-Sung ; Park, Hyun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1157~1169
DOI : 10.5050/KSNVN.2008.18.11.1157
This paper presents spectral element formulation which approximates Lamb wave propagation by PZT transducers bonded on a thin plate. A two layer beam model under 2-D plane strain condition is introduced to simulate high-frequency dynamic responses induced by a piezoelectric (PZT) layer rigidly bonded on a base plate. Mindlin-Herrmann and Timoshenko beam theories are employed to represent the first symmetric and anti-symmetric Lamb wave modes on a base plate, respectively. The Euler-Bernoulli beam theory and 1-D linear piezoelectricity are used to model the electro-mechanical behavior of a PZT layer. The equations of motions of a two layer beam model are derived through Hamilton`s principle. The necessary boundary conditions associated with the electro-mechanical properties of a PZT layer are formulated in the context of dual functions of a PZT layer as an actuator and a sensor. General spectral shape functions of response field and the associated boundary conditions are obtained through equations of motions converted into frequency domain. Detailed spectrum element formulation for composing the dynamic stiffness matrix of a two layer beam model is presented as well. The validity of the proposed spectral element is demonstrated through numerical examples.
A Study on the Control of the Beat Clarity and the Beat Period in a Ring Structure
Kim, S.H. ; Cui, C. X. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1170~1176
DOI : 10.5050/KSNVN.2008.18.11.1170
In this study, we propose a new method to control both the beat clarity and beat period in a ring structure. An equivalent ring which satisfies the measured mode condition is determined by using the equivalent ring theory. Theoretical analysis and finite element analysis on the equivalent ring are performed to investigate the effect of the local structural modification on the beat clarity and beat period. Beat clarity and period are improved by attaching asymmetric mass or decreasing local thickness. Through the analysis on the equivalent ring, the proper position and the amount of the local variation are determined to satisfy the required clarity and period condition. All the analysis results are compared and verified by the experiment.
Analysis for Reducing Vibration Transmitted from the Sea-water Conveying Pipe to the Hull
Han, Hyung-Suk ; Jeong, Weui-Bong ; Park, Kyung-Hoon ; Hong, Chin-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1177~1184
DOI : 10.5050/KSNVN.2008.18.11.1177
URN(underwater radiated noise) is one of the important performances of the battle ship related to the stealth. The main source of the URN is the structure-borne noise on the hull. And the pipe vibration transmitted to the hull is the main source of the structure-borne noise when the speed of the ship is lower than CIS(cavitation inception speed). In this paper, the vibration isolator(rubber mount) for the pipe system is described in order to reduce the structure-borne noise transmitted to the hull. The vibrations on the sea-water conveying pipes and their supports are measured in order to know how much vibration occurs on those positions. Based on these test results, the improved design of the rubber mount is suggested by the parametric study and is verified numerically with the pipe and hull model.
Effect of Piezoactuator Length Variation for Vibration Control of Beams
Lee, Young-Sup ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1185~1191
DOI : 10.5050/KSNVN.2008.18.11.1185
This paper presents an approach to define an optimal piezoactuator length to actively control structural vibration. The optimal ratio of the piezoactuator length against the beam length when a pair of piezoceramic actuator and accelerometer is used to suppress unwanted vibration with direct velocity feedback(DVFB) control strategy is not clearly defined so far. It is well known that DVFB control can be very useful when a pair of sensor and actuator is collocated on structures with a high gain and excellent stability. It is considered that three different collocated Pairs of piezoelectric actuators (20, 50 and 100 mm long) and accelerometers installed on three identical clamped-clamped beams(
). The response of each sensor-actuator pair requires strictly positive real(SPR) property to apply a high feedback gain. However the length of the piezoactuator affects the SPR property of the sensor-actuator response. Intensive simulation and experiment show the effect of the actuator length variation is strongly related with the frequency range of the SPR property. Thus an optimal length ratio was suggested to obtain relevant performance with a good stability under the DVFB strategy.
Reduction of Vibration and Shock in an HDD Car-holder
Im, Hyung-Bin ; Park, Ki-Sun ; Kim, Doo-Hwan ; Chung, Jin-Tai ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1192~1198
DOI : 10.5050/KSNVN.2008.18.11.1192
In this paper, the vibration and shock of an HDD car-holder are reduced through vibration analysis and a structural modification. In order to identify the exciting frequency components of vibration and shock, vibration signals are measured and analyzed from the wind shield or dashboard. In addition, the modal test for the current HDD car-holder is performed to investigate the dynamic characteristics of the car-holder. From these experiments, it is found that the exciting frequencies coincide to the natural frequencies of the car-holder. For the purpose of avoiding resonance, some FEM simulations are carried out and then structural modifications are made for the car-holder. Based on the results of simulations, a prototype of new car-holder are manufactured and tested to demonstrate the reduction of vibration and shock. It is verified by the test that a considerable amount of vibration and shock are reduced.
Application of Strain Energy for Determining the Location of Damping Material
Kim, Joong-Bae ; Ryu, Kuk-Hyun ; Park, Sang-Kyu ; Lee, Sang-Jo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1199~1205
DOI : 10.5050/KSNVN.2008.18.11.1199
The vehicle design engineers have studied the method of applying damping materials to the vehicle bodies by computer simulations and experimental methods in order to improve the vibration and noise characteristics of the vehicles. The unconstrained layer damping, being concerned with this study, has two layers(base layer and damping layer) and proyides vibration control of the base layer through extensional damping. Generally this kind of surface damping method is effectively used in reducing structural vibration at frequencies beyond 150Hz. The most important thing is how to apply damping treatment with respect to location and size of the damping material. To solve these problems, the current experimental methods have technical limits which are cumbersome, time consuming, and expensive. This Paper proposes a method based on finite element method and it employes averaged ESE(element strain energy) percent of total of dash panel assembly for 1/1 octave band frequency range by MSC/NASTRAN. The regions of high ESE percent of total are selected as proposed location of damping treatment. The effect of damping treatment is analyzed by comparing the frequency response function of the SPCC bare Panel and the damping treated panels.
Transfer Path Analysis and Interior Noise Estimation of the Road Noise Using Multi-dimensional Spectral Analysis Method
Park, Sang-Gil ; Kang, Kwi-Hyun ; Hwang, Sung-Wook ; Oh, Ki-Seok ; Rho, Kuk-Hee ; Oh, Jae-Eung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 18, issue 11, 2008, Pages 1206~1212
DOI : 10.5050/KSNVN.2008.18.11.1206
This paper presents a the method for estimating the noise source contribution on the road noise of the vehicle in a multiple input system where the input sources may be coherent with each other. By coherence function method, it is found that the biggest part of the noise source in the road noise is generated by structural vibration on the mechanical-acoustic transfer functions of vehicles. This analysis is modeled as four input/single output system because the noise is generated with four wheels that mechanism of the road noise is very complicated. The coherence function method is proved to be useful tool for identifying of noise source. The overall levels of the interior noise be coherence function method are compared with those measured and calculated by the frequency response function approach using mechanical excitation test. The experimental results have shown a good agreement with the results calculated by the coherence function method when the input sources are coherent strongly each other. The estimation of the road noise indicates that significant coherent can be achieved in the vehicle interior noise.