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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 22, Issue 12 - Dec 2012
Volume 22, Issue 11 - Nov 2012
Volume 22, Issue 10 - Oct 2012
Volume 22, Issue 9 - Sep 2012
Volume 22, Issue 8 - Aug 2012
Volume 22, Issue 7 - Jul 2012
Volume 22, Issue 6 - Jun 2012
Volume 22, Issue 5 - May 2012
Volume 22, Issue 4 - Apr 2012
Volume 22, Issue 3 - Mar 2012
Volume 22, Issue 2 - Feb 2012
Volume 22, Issue 1 - Jan 2012
Selecting the target year
A Comparison of Vibration Isolation Characteristics of Various Forms of Passive Vibration Isolator
Lee, Dae-Oen ; Han, Jae-Hung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 817~824
DOI : 10.5050/KSNVE.2012.22.9.817
Transmission of unwanted vibration to sensitive systems can cause various problems including performance degradation and system malfunction. The most common approach to limit the transmission of harmful vibration disturbances to the sensitive system is adapting passive vibration isolator. The classical passive vibration isolator comprising a viscous damper and spring element in parallel, however, exhibits conflicting performance characteristics in that low amplification at the resonance, which is desirable, can only be achieved at the sacrifice of vibration isolation performance in high frequency region, which is undesirable. In this paper, vibration isolation characteristics of various passive isolator schemes in literature to circumvent this conflict are introduced and compared.
Sound Quality Characteristics of the Cicada Singing Noise in Urban Areas
Gu, Jin-Hoi ; Lee, Jae-Won ; Lee, Woo-Seok ; Choi, Kyung-Hee ; Seo, Chung-Youl ; Park, Hyung-Kyu ; Kim, Sam-Soo ; Han, Jin-Seok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 825~829
DOI : 10.5050/KSNVE.2012.22.9.825
The global warming caused the changes of our environment like an increasing tropical night phenomenon in the middle latitude areas. Especially, in Korea, the habitats of tropical Korean blockish cicada have changed from Jeju island located in Southern part of Korea to the whole of Korea because of the increasingly warming weather. The cicadas crying sound have been social problem because the tropical Korean blockish cicadas cry at middle of the night owing to the various outdoor lights. The cicada is positive phototaxis insect. So, the cicada is not cry at night. But if the outdoor light is very bright, then the cicada confuse the night as a day and start to cry. As a result, the cicadas crying noise has caused the resident living in downtown to an unpleasure and sleeplessness. In this research, we have measured three kinds of cicada singing noise at 16 points of urban area(Incheon, Gwangju, Busan, Gyeonggido Anyang). And then we analyzed the sound quality of the three kinds of cicada singing noise using by CADA-X signal process program. And we analyzed the acoustical characteristics by STFT(short time Fourier transform) which is a time-frequency analysis method. The characteristics of the cicada singing noise in terms of the sound quality and the time-frequency variation will be usefull to discover the relations between the human annoyance about the cicada singing noise and the acoustical characteristics.
Development of the NDIF Method Using a Sub-domain Approach for Extracting Highly Accurate Natural Frequencies of Arbitrarily Shaped Plates
Kang, S.W. ; Yon, J.I. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 830~836
DOI : 10.5050/KSNVE.2012.22.9.830
The NDIF method based on a sub-domain technique is introduced to extract highly accurate natural frequencies of arbitrarily shaped plates with the simply-supported boundary condition. The NDIF method, which was developed by the authors for the eigen-mode analysis of arbitrarily shaped plates with various boundary conditions, has the feature that it yields highly accurate natural frequencies thanks to its effective theoretical formulation, compared with other analytical methods or numerical methods(FEM and BEM). However, the NDIF method has the weak point that it can be applicable for only convex plates. It was revealed that the NDIF method offers very inaccurate natural frequencies or no solution for concave cavities. To overcome the weak point, the paper proposes the sub-domain method of dividing a concave plate into several convex domains. Finally, the validity of the proposed method is verified in various case studies, which indicate that natural frequencies obtained by the proposed method are very accurate compared to the exact method and FEM(ANSYS).
Improvement of Insulation Performance of Vehicle Rubber Hoses
Jung, Heon-Seob ; Min, Byung-Kwon ; Lee, Seong-Hoon ; Woo, Hee-Soo ; Park, Hyun-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 837~844
DOI : 10.5050/KSNVE.2012.22.9.837
We considered an approach in terms of materials for improvement of insulation performance of vehicle rubber hoses. Ethylene propylene rubber(EPDM) for heater hoses in cooling system and acrylic rubber(AR) for intercooler hose in intake system were chosen for mixing for the vibration and noise performance. We modified EPDM and AR through changing compound of base polymer, reinforcement fillers and additives. Dynamic mechanical analysis(DMA) was used to measure viscoelastic properties such as shear modulus and loss factor(
). Vehicle acceleration test was also conducted to observe indoor changes in insulation performance of hoses.
Development of Ultrasonic Transducer System for Wireless Power Transfer Part 1 : Transmitter Development
Youm, Woo-Sub ; Hwang, Gunn ; Yang, Woo-Seok ; Lee, Sung-Q ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 845~852
DOI : 10.5050/KSNVE.2012.22.9.845
Recently, wireless power transfer technology is ready to be commercialized in consumer electronics. It draws attention from not only experts but also public because of its convenience and huge market. However, previous technologies such as magnetic resonance and induction coupling have limited applications because of its short transfer distance compared to device size and magnetic intensity limitation on the safety of body exposure. As an alternative, ultrasonic wireless power transfer technology is proposed. The ultrasonic wireless power transfer system is composed of transmitter which converts electrical energy to ultrasonic energy and receiver which converts the ultrasonic energy to the electrical energy again. This paper is focused on the development of high energy conversion efficiency of ultrasonic transmitter. Optimal transfer frequency is calculated based on the acoustic radiation and damping effect. The transmitter is designed through numerical analysis, and is manufactured to match the optimal transfer frequency with the size of 100 mm diameter, 12.2 mm thickness plate. The energy conversion efficiency of about 13.6 % at 2 m distance is obtained, experimentally. This result is quite high considered with the device size and the power transfering distance.
Identification of Pick up Sound for Laser printers Based on Psychoacoustic Parameters
Lee, Young-Jun ; Shin, Tae-Jin ; You, Jin ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 853~860
DOI : 10.5050/KSNVE.2012.22.9.853
This paper identifies a cause of pick up noise in a laser printer and a relationship between pick up noise and major components related to pick up noise. A pick up sound is affected by many components such as spring force, spring constant, and friction coefficient. Objective evaluation for the pick up sound is difficult because of back ground sound such as operating sound. Especially, a sound between a friction pad and a paper in the process of printing has become an essential issue in an aspect of quality evaluation. However the existing criteria for determining the above sound have solely relied on human's subjective judgments; which highlights the requirement to objectify these criteria. In this paper, the standard of existing pick up noise is established by finding the tonality, which is a psychoacoustic parameter, of noticeable limit sound level. Based on the findings of the method, the study has found factors which cause pick up noise and suggests the substitution of following components of printers such as spring constants, spring force, and the quality of friction pads. As a result, it is confirmed that the proposed pick up noise index has usefulness to classify whether existence of pick up noise with an objective evaluation and not to occur the noise based on design optimized combination of laser printer components.
Improvement of Steady-state Error in a Driving System with Time-optimal Controller
Lee, Seong-Woo ; Song, Oh-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 861~869
DOI : 10.5050/KSNVE.2012.22.9.861
This paper presents a high performance position controller in a driving system using a time optimal control which is widely used to control driving systems to a desired reference position or velocity in minimum response time. The main purpose of this study is an improvement of transient response performance rather than steady-state response comparing with another various control strategies. In order to improve the performance of time optimal control, we tried to find the cause of the steady-state error in the driving system we have already made up and also suggest the newly modified type of time optimal control method in this paper.
A Case Study of Analysis and Evaluation of Vibration by Construction of Cast in Place Concrete Pile in the Neighboring Areas of Heunginjimun
Choi, Jae-Sung ; Min, Kyung-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 870~878
DOI : 10.5050/KSNVE.2012.22.9.870
This paper analysed the effect on Heunginjimun of ground vibrations due to C.I.P. works during Heunginjimun restoration period. Vibration criteria and laws for historic structures was investigated. The vibration was measured under test construction in the field, analysed and evaluated. Because the ground vibration exceeded the vibration criteria, the restoration construction could not be go along. But as vibration was transferred to the upper structures, it was confirmed that vibration levels declined, because of differences between natural and forced frequencies. If the natural frequencies database of historic structures are established, it will help with management and preservation of cultural properties by an environmental vibration effects evaluation.
Nonlinear Dynamic Analysis of Space Truss by Using Multistage Homotopy Perturbation Method
Shon, Su-Deok ; Ha, Jun-Hong ; Lee, Seung-Jae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 879~888
DOI : 10.5050/KSNVE.2012.22.9.879
This study aims to apply multistage homotopy perturbation method(MHPM) to space truss composed of discrete members to obtain a semi-analytical solution. For the purpose of this research, a nonlinear governing equation of the structures is formulated in consideration of geometrical nonlinearity, and homotopy equation is derived. The result of carrying out dynamic analysis on a simple model is compared to a numerical method of 4th order Runge-Kutta method(RK4), and the dynamic response by MHPM concurs with the numerical result. Besides, the displacement response and attractor in the phase space is able to delineate dynamic snapping properties under step excitations and the responses of damped system are reflected well the reduction effect of the displacement.
Statistical Analysis of Initial Behavior of a Vertically-launched Missile from Surface Ship
Kim, Kyung-Tae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 889~895
DOI : 10.5050/KSNVE.2012.22.9.889
A vertical launching system(VLS) is a system for holding and firing missiles on surface ships. When a missile is launched in VLS, relative motion between canister and missile and drag force induced by wind can cause initial unstability of a missile. Thus dynamic analysis of initial behavior of vertically launched missile should be performed to prevent collision with any structure of a ship. In this study, dynamic analyses of initial behavior of vertically launched missile are performed using Monte-Carlo simulation, which relys on random sampling and probabilistic distribution of variables. Each parameter related with dynamic behavior of a missile is modeled with probability variables and Recurdyn, a commercial software for multi body dynamic analysis, is used to perform Monte-Carlo simulation. As a result, initial behavior of a missile is evaluated with respect to various performance indexes in a probabilistic sense and sensitivity of the each parameters is calculated.
Development of a Dedicated Algorithm for the Analysis of DC Electrical Outputs of Cantilevered Piezoelectric Vibration Energy Harvesters
Kim, Jae-Eun ; Kim, Yoon-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 896~902
DOI : 10.5050/KSNVE.2012.22.9.896
For most applications of the vibration energy harvesting technology as in wireless sensor networks for smart buildings and plants, the evaluation of DC output performance of vibration energy harvesters is typically required. However, there is no dedicated algorithm for the evaluation. The lack of a dedicated algorithm results from difficulties in the direct incorporation of nonlinear rectifying and regulating circuitry into finite element models of piezoelectric vibration energy harvesters. In this study, we develop a dedicated algorithm and present software based on it for the evaluation of not only AC but also DC electrical quantities. Here, an equivalent electrical circuit model is employed. The COMSOL multiphysics simulation tool is adopted for extracting equivalent electrical circuit parameters of a piezoelectric vibration energy harvester and MATLAB is used to make a graphical user interface. The AC voltage and power outputs calculated by the proposed algorithm under various conditions are compared with those by a traditional finite element analysis. The DC output voltage and power through a rectifier are obtained for varying values of smoothing capacitance and external resistance.
Kinematical Analysis and Vibrational Characteristics of Orthogonal 2-dimensional Vibration Assisted Cutting Device
Loh, Byoung-Gook ; Kim, Gi-Dae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 9, 2012, Pages 903~909
DOI : 10.5050/KSNVE.2012.22.9.903
In elliptical vibration cutting(EVC) where the cutting tool traces a micro-scale 2-dimensional elliptical trajectory, the kinematical and vibrational characteristics of the EVC device greatly affect cutting performance. In this study, kinematical and vibrational characteristics of an EVC device constructed with two orthogonally-arranged stacked piezoelectric actuators were investigated both analytically and experimentally. The step voltage was applied to the orthogonal EVC device and the associated displacements of the cutting tool were measured to assess kinematical characteristics of the orthogonal EVC device. To investigate the vibrational characteristic of the orthogonal EVC, sinusoidal voltage was applied to the EVC device and the resulting displacements were measured. It was found from experiments that coupling of displacements in the thrust and cutting directions and the tilt of the major axis of the elliptical trajectory exists. In addition, as the excitation frequency is in vicinity of resonant frequencies the distortion in the shape of the elliptical trajectory becomes greater and change in the rotation direction occurs. To correct the shape distortion of the elliptical trajectory, the shape correcting procedure developed for the parallel EVC device was applied for the orthogonal EVC device and it was shown that the shape correcting method successfully corrects distortion.