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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
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 24, Issue 12 - Dec 2014
Volume 24, Issue 11 - Nov 2014
Volume 24, Issue 10 - Oct 2014
Volume 24, Issue 9 - Sep 2014
Volume 24, Issue 8 - Aug 2014
Volume 24, Issue 7 - Jul 2014
Volume 24, Issue 6 - Jun 2014
Volume 24, Issue 5 - May 2014
Volume 24, Issue 4 - Apr 2014
Volume 24, Issue 3 - Mar 2014
Volume 24, Issue 2 - Feb 2014
Volume 24, Issue 1 - Jan 2014
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Effect of Contact Stiffness on Brake Squeal Analysis Using Analytical FE Squeal Model
Kang, Jaeyoung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 749~755
DOI : 10.5050/KSNVE.2014.24.10.749
The analytical-finite element(FE) squeal model is applied to investigate the squeal propensity associated with contact stiffness of the disc brake system. The system contact stiffness is incorporated into the perturbed equations of motion in the analytical manner where the brake components are modeled by FE method. The results show that the contact stiffness of the friction material and the contact stiffness between the pads and caliper are the influential factors on the squeal propensity. Particularly, the modal instability of the 3200 Hz squeal mode drastically changes with respect to the contact stiffness between the pads and caliper.
Analysis and Experiment of Pressure Pulsation in a Suction Pipe of Compressor
Oh, Han-Eum ; Jeong, Weui-Bong ; Ahn, Se-Jin ; Kim, Min-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 756~762
DOI : 10.5050/KSNVE.2014.24.10.756
This paper dealt with numerical estimation of the pressure pulsation of the refrigerant in a suction pipe of the compressor. The behavior of the pressure pulsation was assumed to satisfy the wave equation. The boundary conditions and properties of refrigerant are necessary as input data of the simulation. The pulsating pressures at 15 points in a pipe were measured simultaneously from the pressure transducers. From the experimental data, the complex phase speed and impedance at the end of the pipe of the refrigerant were estimated using the signal processing and used as the input conditions of the numerical analysis. A commercial acoustic software was used to solve the behavior of pressure pulsation. The numerical results for the pressure pulsation in a pipe with and without expansion chamber were carried out and compared with those by experiments. Finally, numerical procedure to estimate the pressure pulsation in a pipe was established and verified.
A Study on the Radiated Noise the Prediction in the Pipe by Fluid Induced Vibration using the Radiation Efficiency and Pipe Surface Vibration
Yi, Jongju ; Park, Kyunghoon ; Jung, Woojin ; Seo, Youngsoo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 763~769
DOI : 10.5050/KSNVE.2014.24.10.763
This study is on the experiment and prediction of the pipe noise due to the internal fluid. The vibration of pipe external surface and noise in air were measured according to the internal fluid velocity and pipe type. In the experiment, the vibration and noise level of the straight pipe and rounded pipes show that the vibration and noise level are almost same. The 900 mitred pipe shows the high vibration and noise level. In the prediction of noise due to the internal flow, the method using the pipe surface vibration and radiation efficiency shows good agreement with experimental result.
A Numerical Analysis Study on the Estimation of the 3D Underwater Radiated Noise Pattern using the Hull Vibration Signals
Yi, Jong-Ju ; Kang, Myung-Hwan ; Han, Seung-Jin ; Bae, Soo-Ryong ; Kim, Jae-Ho ; Jung, Woo-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 770~779
DOI : 10.5050/KSNVE.2014.24.10.770
In this study, a numerical estimation method for 3D underwater radiated noise pattern using hull vibration and total acoustic power of the vibrating structure in the far-field is proposed. The underwater radiated noise pattern is known to be predicted using the vibration signals and radiation efficiency of each surface patch. But it is very difficult to know radiation efficiency of each surface patch which is one of important factors to calculate the 3D underwater radiated noise pattern. Instead of using radiation efficiency of each patch, the underwater radiated noise level is modified with the total acoustic power of the vibrating structure. The suggested estimation method for underwater radiated noise pattern is discussed with numerical model.
In-plane Vibration Characteristics of Piezoelectric Ring Transducers
Piao, Chunguang ; Kim, Jin Oh ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 780~787
DOI : 10.5050/KSNVE.2014.24.10.780
This paper experimentally deals with the vibration characteristics of flat ring transducers used for ultrasonic sensors and actuators. Radial vibration mode, which is the fundamental mode of a thin piezoelectric transducer, was measured by a laser in-plane vibrometer. An impedance analyzer was used to measure natural frequencies. The results measured by experiments verified theoretical predictions. The vibration characteristics of ring transducers were identified according to the outer diameter size. The shape of the fundamental mode is almost uniform but slightly decreases from the inner to the outer circumferential surfaces. The natural frequency of the fundamental mode decreases as the outer diameter increases. It appears that the ring type transducer is suitable to excite uniformly distributed vibration on a flat surface.
Transient Response Analysis of Trapezoidal Corrugated Plates with Stiffeners
Park, Kyung-Jo ; Kim, Young-Wann ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 788~794
DOI : 10.5050/KSNVE.2014.24.10.788
In this paper, the transient response analysis of the trapezoidal corrugated plate subjected to the pulse load is investigated by the theoretical method. Three types of pulse loads are considered: stepped, isosceles triangular and right triangular pulse loads. The corrugated plates can be represented as an orthotropic plate. Both the effective extensional and flexural stiffness of this equivalent orthotropic plate are considered in the analysis. The plate is stiffened by concentric stiffeners perpendicular to the corrugation direction. The stiffening effect is represented by the discrete stiffener theory. This theoretical results are validated by those obtained from 3D finite element analysis based on shell elements. Some numerical results are presented to check the effect of the geometric properties.
Correction of Error due to Camera Vibrating During Detecting Steam Leakage by Using Image
Choi, Young-Chul ; Jeon, Hyeong-Seop ; Son, Ki-Sung ; Park, Jong Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 795~801
DOI : 10.5050/KSNVE.2014.24.10.795
Steam leakage is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. Recently, the research detecting the steam leakage by using camera image is introduced. However, this method has a disadvantage. If a camera oscillates, it cannot detect a steam leakage exactly. In this paper, the technique that reduces the error due to a camera shaking is proposed. To verify the proposed method, we have performed the experiments for the oil leakage experiments. The results show that the technique can calibrate the error due to camera shaking.
A Comparison of Estimation Method for Population Exposed to Noise Using Noise Map
Choi, Sung Kyu ; Lee, Byung Chan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 802~808
DOI : 10.5050/KSNVE.2014.24.10.802
The purpose of this study is to suggest efficient methods for estimating population exposed to noises by analyzing differences of population exposed to noises estimated by each method through comparing exposed population estimated by utilizing existing methods and those estimated by using census output areas reflecting the actual population information of each address. For population exposed to noises, the error of exposed population estimated by using the per capita living space turned out to be the biggest, and other estimation methods had no significant difference. For population exposed to excess noises, as a result of analyzing population estimated by each method based on census output areas, the error of the method using a grid noise map turned out to be the biggest. For the method to estimate population exposed to noises by using a noise map, the estimation methods using census output areas and total ground area are considered to be more rational than the grid noise map estimation method or the method to estimate the living space per capita.
Design Optimization Process for Electromagnetic Vibration Energy Harvesters Using Finite Element Analysis
Lee, Hanmin ; Kim, Young-Cheol ; Lim, Jaewon ; Park, Seong-Whan ; Seo, Jongho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 809~816
DOI : 10.5050/KSNVE.2014.24.10.809
This paper presents a systematic optimization process for designing an electromagnetic vibration energy harvester using FEA(finite element analysis) to improve computational accuracy and efficiency. A static FEA is used in the optimization process where trend analysis in a short period of time is rather important than precise computation, while a dynamic FEA is used in the verification step for the final result where precise computation is more important. An electromechanical transduction factor can be calculated efficiently by using an approach to use the radial component of magnetic flux density directly instead of an approach to compute the flux density gradient. The proposed optimization process was verified through a case study where simulation and experiment results were compared.
Correction of Error due to Camera Shaking when Vibration Measurement by Using Camera Image
Jeon, Hyeong-Seop ; Son, Ki-Sung ; Han, Soon Woo ; Park, Jong Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 10, 2014, Pages 817~824
DOI : 10.5050/KSNVE.2014.24.10.817
Accelerometer and laser vibrometers are widely used to measure vibration of structures like a building or piping. Recently, the research measuring vibration by using camera image is introduced. However, this method has a disadvantage. If camera moves by the vibration cannot measure the vibration displacement of structure. We proposed the enhanced technique for measuring vibration using camera. This paper took the experiment for correction of error due to camera shaking. We verified through an experiment. And the accuracy of the method measuring the vibration displacement by using the camera images was analyzed.