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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 23, Issue 12 - Dec 2013
Volume 23, Issue 11 - Nov 2013
Volume 23, Issue 10 - Oct 2013
Volume 23, Issue 9 - Sep 2013
Volume 23, Issue 8 - Aug 2013
Volume 23, Issue 7 - Jul 2013
Volume 23, Issue 6 - Jun 2013
Volume 23, Issue 5 - May 2013
Volume 23, Issue 4 - Apr 2013
Volume 23, Issue 3 - Mar 2013
Volume 23, Issue 2 - Feb 2013
Volume 23, Issue 1 - Jan 2013
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Study on 4-degree-of-freedom Mathematical Model for Simulation of Wind Turbine System at Initial Design Stage
Shin, Yun-Ho ; Moon, Seok-Jun ; Chung, Tae-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 681~689
DOI : 10.5050/KSNVE.2013.23.8.681
The commercial tools to simulate the non-linear dynamic characteristics of wind turbine system are various but, the tool take much time to simulate the control algorithm and require many input variables. In this paper, the procedures to derive the simplified 4-degree-of-freedom mathematical model of a 2-MW wind turbine which could be used at the initial design stage of the controller are proposed based on RISO`s suggested method. In this model, the 1st tower fore-after bending motion and 1st blade flapping motion are also considered in addition to the rotor-generator rotation motion in the 2-DOF model. The effectiveness of the 4-DOF model is examined comparing with the 2-DOF model and verification of the simplified model is accomplished through modal analysis for whole wind turbine system.
The Development of PLS-II Storage-ring Girder Systems at PAL
Kim, Seungnam ; Lee, Chaesun ; Lee, Honggi ; Kim, Kwangwoo ; Nam, Sanghun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 690~697
DOI : 10.5050/KSNVE.2013.23.8.690
The magnets and vacuum chambers, which are the main facilities of the Pohang light source are installed on the storage-ring girders. System safety and reliability should be taken into account for the precise operating of the main facilities, so vibration analysis is essential to do this. Static and seismic analyses were performed for the design of structure considering safety, and also frequency and response spectrum analyses were performed for the precise alignment. With these results, the effects of surrounding vibration were checked. This paper explains about the design and vibration analysis of girder systems.
Vibration of Beams Induced by Wall Pressure Fluctuation in Turbulent Boundary Layer Using Numerical Approaches
Ryue, Jungsoo ; Kim, Eunbi ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 698~706
DOI : 10.5050/KSNVE.2013.23.8.698
Structural vibration induced by excitation forces under turbulent boundary layer is investigated in terms of the numerical analysis in this paper. Since the responses of structures excited by the wall pressure fluctuation(WPF) are described by the power spectral density functions, they are calculated and reviewed theoretically for finite and infinite length beams. For the use of numerical approaches, the WPF needs to be discretized but conventional finite element method is not much effective for that purpose because the WPF lose the spatial correlation characteristics. As an alternative numerical technique for WPF modelling, a wavenumber domain finite element approach, called waveguide finite element method, is examined here for infinite length beams. From the comparison between the numerical and theoretical results, it was confirmed that the WFE method can effectively and easily cope with the excitation from WPF and hence the suitable approach.
Prediction of Tire Pattern Noise Based on Image Signal Processing
Kim, Byung-Hyun ; Hwang, Sung-Uk ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 707~716
DOI : 10.5050/KSNVE.2013.23.8.707
Tire noise is divided into two parts. One is pattern noise the other one is road noise. Pattern noise primarily occurs in over 500 Hz frequency but road noise occurs mainly in low frequency. It is important to develop a technology to predict the pattern noise at the design stage. Prediction technology of pattern noise has been developed by using image processing. Shape of tire pattern is computed by using imaging signal processing. Its results are different with the measured one. Therefore, the prediction of actual measured pattern noise is valuable. In the signal processing theory is applied to calculate the impulse response for the measurement environment. This impulse response used for the prediction of pattern noise by convolving this impulse response by the results of image processing of tire pattern.
Brake Squeal Analysis with Respect to Caliper Contact Stiffness
Nam, Jaehyun ; Kang, Jaeyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 717~724
DOI : 10.5050/KSNVE.2013.23.8.717
The present study provides the numerical results in association with caliper stiffness and friction curve. From the numerical results, it is concluded that the pad vibration modes with dominant displacement in rotation direction is sensitive in the flutter instability. Particularly, the pad rigid mode is shown to become the squeal mode when the caliper stiffness is introduced in brake squeal model. Therefore, the caliper contact stiffness between the pad and caliper is expected to contribute to the squeal modes of the brake pad.
New Formulation of MNDIF Method for Extracting Accurate Natural Frequencies of Plates
Kang, Sang-Wook ; Yoon, Juil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 725~733
DOI : 10.5050/KSNVE.2013.23.8.725
An improved formulation of the MNDIF method is introduced to extract highly accurate natural frequencies of concave plates with arbitrary shape. Originally, the MNDIF method cannot yield accurate natural frequencies for concave plates. It can be applicable to only convex plates. To overcome this weak point, a new approach of dividing a concave plate into two convex domains and applying the MNDIF method to each domain is proposed and the validity and accuracy are shown in verification examples.
Stability Analysis of Mathieu Equation by Floquet Theory and Perturbation Method
Park, Chan Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 734~741
DOI : 10.5050/KSNVE.2013.23.8.734
In contrast of external excitations, parametric excitations can produce a large response when the excitation frequency is away from the linear natural frequencies. The Mathieu equation is the simplest differential equation with periodic coefficients, which lead to the parametric excitation. The Mathieu equation may have the unbounded solutions. This work conducted the stability analysis for the Mathieu equation, using Floquet theory and numerical method. Using Lindstedt`s perturbation method, harmonic solutions of the Mathieu equation and transition curves separating stable from unstable motions were obtained. Using Floquet theory with numerical method, stable and unstable regions were calculated. The numerical method had the same transition curves as the perturbation method. Increased stable regions due to the inclusion of damping were calculated.
Free Vibration Analysis of a Rotating Cantilever Beam Made-up of Functionally Graded Materials
Lee, Ki Bok ; Yoo, Hong Hee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 742~751
DOI : 10.5050/KSNVE.2013.23.8.742
The vibration analysis of a rotating cantilever beam made-up of functionally graded materials is presented based on Timoshenko beam theory. The material properties of the beams are assumed to be varied through the thickness direction following a simple power-law form. The frequency equations, which are coupled through gyroscopic coupling terms, are calculated using hybrid deformation variable modeling along with the Rayleigh-Ritz assumed mode methods. In this study, resulting system of ordinary differential equations shows the effects of power-law exponent, angular speed, length to height ratio and Young`s modulus ratio. It is believed that the results will be a reference with which other researchers and commercial FE analysis program, ANSYS can compare their results.
External Leakage on Helmholtz Resonators
Lee, Iljae ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 752~758
DOI : 10.5050/KSNVE.2013.23.8.752
The effect of external leakage on the acoustic performance of Helmholtz resonators is experimentally and numerically investigated. The transmission loss of the Helmholtz resonator with a circular perforated hole is measured by using an impedance tube setup. The experimental results are then compared with one-dimensional analytical and three-dimensional numerical results. As the size of the hole increases, the peak of the transmission loss shifts to higher frequency, especially for the holes on the cavity. While the transmission loss is almost independent of the location of the hole on the cavity, the impact of the hole location on the neck on the transmission loss is not negligible. The results show that one-dimensional analytical method can predict the overall trends, whereas three-dimensional numerical method is necessary for more accurate predictions.
Dynamic Characteristic Analysis Procedure of Helicopter-mounted Electronic Equipment
Lee, Jong-Hak ; Kwon, Byunghyun ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 759~769
DOI : 10.5050/KSNVE.2013.23.8.759
Electronic equipment has been applied to virtually every area associated with commercial, industrial, and military applications. Specifically, electronics have been incorporated into avionics components installed in aircraft. This equipment is exposed to dynamic loads such as vibration, shock, and acceleration. Especially, avionics components installed in a helicopter are subjected to simultaneous sine and random base excitations. These are denoted as sine on random vibrations according to MIL-STD-810F, Method 514.5. In the past, isolators have been applied to avionics components to reduce vibration and shock. However, an isolator applied to an avionics component installed in a helicopter can amplify the vibration magnitude, and damage the chassis, circuit card assembly, and the isolator itself via resonance at low-frequency sinusoidal vibrations. The objective of this study is to investigate the dynamic characteristics of an avionics component installed in a helicopter and the structural dynamic modification of its tray plate without an isolator using both a finite element analysis and experiments. The structure is optimized by dynamic loads that are selected by comparing the vibration, shock, and acceleration loads using vibration and shock response spectra. A finite element model(FEM) was constructed using a simplified geometry and valid element types that reflect the dynamic characteristics. The FEM was verified by an experimental modal analysis. Design parameters were extracted and selected to modify the structural dynamics using topology optimization, and design of experiments(DOE). A prototype of a modified model was constructed and its feasibility was evaluated using an FEM and a performance test.
A Study on the Absorptive Silencer for Reducing Noise Propagate in Seawater Pipes on Ship
Seo, Youngsoo ; Park, Kyenghoon ; Jeon, Jaejin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 23, issue 8, 2013, Pages 770~776
DOI : 10.5050/KSNVE.2013.23.8.770
Fluid-borne noise produced by seawater circulating pumps propagates through the seawater connected pipes and radiates from the hull opening of a ship. This noise causes the increases of underwater radiated noise and self noise of ship. To reduce the noise propagation through the seawater connected pipes, absorptive silencer must be needed. In this paper, theoretical model to analyze the transmission loss of absorptive silencer was presented and the design parameters of absorptive silencer were verified. Theoretical calculations were performed according to a thickness, a length, an internal pressure and mechanical properties of its absorptive material in order to analyze the characteristics of absorptive silencer. From the theoretical calculation results, the absorptive silencer was manufactured and transmission loss was measured in the test facilities. The results of theory and measurement are compared and discussed.