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김중배 ( Joong-bae Kim ) 한국고등직업교육학회 2003 한국고등직업교육학회논문집 Vol.4 No.3
All passenger vehicles are treated with damping materials like viscoelastic asphalts to reduce structure borne noise which has bad effects on the drivers and the passengers for driving comfort. The effectiveness of clamping treatments depends on design parameters such as properties and attaching locations of damping materials. The paper focuses on deciding locations and size of damping treatments for simple plate specimen by strain energy analysis on the vibrating plate. This approach shows the method of efficient and reliable damping treatments for structure borne noise reduction and can be applied to the complex panels such as vehicle panel assemblies.
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김중배(Joong Bae Kim),노진성(Jinsung Rho),이봉재(Bong Jae Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This study proposes a technique for measuring the thermal conductivity of powdered metal hydride. The proposed technique was verified through numerical simulation and uncertainty analysis, and its applicability was evaluated by implementing it as an actual apparatus. In order to overcome the problems such as requiring a large amount of sample and long measuring time of the Guarded Hot Plate method, the scale of the device was drastically reduced, and feedback control was applied in this study. In addition, it contributed to increasing the repeatability of measurement by adopting a case that can accurately contain powder samples in the repeated measurements. As a result, it got to be possible to precisely measure the effective thermal conductivity of metal hydrides using the proposed technique.
김중배 ( Joong-bae Kim ),김영훈 ( Young-hoon Kim ) 한국고등직업교육학회 2001 한국고등직업교육학회논문집 Vol.2 No.4
In this study the dynamic characteristic of a composite beam is analyzed. It is composed of SPCC metal beam and visco-elastic pad (asphalt). The well-known Oberst beam test is carried out to get the material properties of the visco-elastic material. The RKU equation is applied to the measured data from the Oberst beam test to get the equivalent properties of the composite beam, and the results are used to analyze the equivalent beam model. The frequency dependent elastic or shear modulus and the corresponding loss factor of a visco-elastic material are considered in numerical analysis. The results of the analysis are compared with the experimental analysis. The results of both analyses show so good agreement with each other that the method of numerical analysis for the highly non-linear material structure is proposed for the similar system.
김중배(Kim, Joong-Bae),유국현(Ryu, Kuk-Hyun),박상규(Park, Sang-Kyu),이상조(Lee, Sang-Jo) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.11
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.