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Sungil Bang,Yoojin Park,Yeonsoo Kim,Tae Jin Shin,Jiseon Back,이상권 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.1
The paper presents the change of the interior noise according to the lamination angles of the carbon fiber in the carbon-fiber reinforced plastic (CFRP) laminated composite plate. In the previous paper, the charateristics of the sound radiated from a CFRP plate was studied in the free field condition. In this paper, vibro-acoustic interaction for the CFRP plate with various lamination angles was studed considering the application of the CFRP plate to car roof. In order to study the vibro-acoustic interaction, a certain enclosure with flexible wall was required and then the closed rectangular box was prepared. The one flexible wall of the rectangular box consisted of CFRP plate. Three CFRP plates with fiber lamination angles of [−15/15/15/−15]s, [−30/30/30/−30]s, and [−75/75/75/−75]s were fabricated and used as one flexible wall of the closed box. These plates were excited by an impact force, and the interior sound pressure within the closed box was calculated both theoretically and experimentally. Then, the identified vibro-acoustic characteristics were used to apply the CFRP plate to the roof of a car, thereby shifting the resonance frequency of the interior noise.
Complementarity of Horizontal and Vertical Multinational Activities
Sungil Bae,Tae Hwan Yoo 한국무역학회 2005 Journal of Korea trade Vol.9 No.2
This paper explores the multinational activities of the Japanese automobile industry by focusing on the vertical production structure of a firm. The main objective of this paper is to analyze the effects of horizontal multinational activities on vertical multinational activities. First, we construct a theoretical model to predict whether an increase in horizontal multinational activity leads to an increase in existing vertical multinational activity. This result mainly comes from the increased flow of intermediate products. Second, we test a theoretical model by applying annual data from Japanese automobile industry for 1982 to 1997. The estimated results provide a complementary relationship between horizontal and vertical multinational activities, thereby supporting the results of the theoretical model.