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실험적 방법을 통한 횡 탑재 엔진 차량에 대한 진동 해석
양성모,김남응,김중희 한국소음진동공학회 1999 소음 진동 Vol.9 No.4
Research on vibration of a vehicle with a transversely mounted 4-cylinder engine was performed using a vector synthesis method, Data of the engine vibration for the vector synthesis method was obtained experimentally and the data was ODS-fitted to calculate vibration level on any engine location assuming that the engine is rigid body in the frequency range of interest. In order to derive the excitation force on the vehicle body, the displacements were converted from the acceleration of engine. The transfer functions from engine mounts to toe pan on the floor were obtained experimentally. The vibration level on the toe pan was predicted by multiplying the excitation force by the transfer function. The predicted vibration level was compared with experimental data and the result was reasonable. Using the developed method, analysis was made for the effect of body fixture conditions of the vehicle when testing the engine vibration and for the effect of the transfer functions when the engine is installed or when the engine is removed. Finally the degree of contribution for 12 transfer paths was calculated.
양성모,강희용,김홍진,송준혁,A. Shimamoto 한국생산제조학회 2003 한국생산제조학회지 Vol.10 No.6
Evaluation of fatigue strength on the spot welded part is very important for strength design of spot welded steel structures. In this paper, we could get the life cycle of the spot welded part using the lethargy coefficient obtained through the quasi-static tensile shear test for the specimen welded by current 10kA. The reliability evaluation of the life cycle is completed by comparing the life cycle calculated under the constant loading rate with the life cycle obtained by dynamic fatigue test. And then the result calculated by the lethargy coefficient is verified through the lift cycle calculated using the dynamic final tensile stress formula under the increased loading speed. This way can make save the time and cost in processing of predicting the life cycle of a structure.
梁成模 啓明大學校 産業經營硏究所 1980 經營經濟 Vol.12 No.1
Ⅰ The purpose of this article is to review the possibility of trade onlargement between the Western nations and Eastern nations, and especially the possibility of exportmarket development in the Eastern nations for the Korean products. Ⅱ After a brief deseription of the historical development and current state of the East-West trade, the following special characteristics in the East-West trade emphasized. the foreign trade in the soeialist nations is controlled and managnd direetly by government. The East-West trade agreements are characterized by compensation deals, counter-purchases, and product buy-back. The methods of East-West trade are characterized by payment by transferrable currencies, compensation trade or switch trade, and payment by the bilateral payment agreement. There are two contradictive views on the perspeetives of the East-West trade. Firstly, the affirmative view insist that socialist nations will do their best to achieve their domestie eeonomie development and to enhance the standard of living of their people by continuous importing of machineries, equipments and technology. There has been sufficient variation of export-import programs and manage ment systems even among socialist nations. Socialist nations need the economic cooperation with the Western nations in the fields of technology and resource development. An excellent example of such optimistic view is the improve ment of China's international trade position, resulting from a detente between Peking and Washington. The other hand, the pessimistic view is that the differences of economic systems between the Eastern and the Western nations including politieal factors will hamper the East-West trade. The low-quality of the industrial goods has reduced the international competiveness of the socialist nations. It is very difficult for capitalist nations to acquire the economic information about socialist nations. The Korean government has amended the Trade Transaction Law to trade with non-hostile communict nations. Korea eurrently conducts trade with 13 socialist nations. Especially, we established foreign-exchange bank offiees in Austria and Switzerland to handle the currency exchange problems connected with such transactions. An agreement was also made with Finland on the establishment of a joint venture company solely for the transaction of trade with the East European nations on the private basis. Ⅲ There are still many negative factors on East-West trade. For the socialist nations, however it is eearly impossible to achieve their economic development program without importing both captital and consumer goods from capitalist nations. On the part of capitalist nations, there exists a great potential for their products in the socialis markets. So, the future of the East-West trade will have a bright prospect if the internal and external conditions become favorable and mutual efforts of both sides for active trade are continued.