This paper compares and analyzes the changes in the Chinese automobile market in recent years as well as the competition strategy of top makers of European, American, Japanese, Korean, and Chinese automobiles. In part...This paper compares and analyzes the changes in the Chinese automobile market in recent years as well as the competition strategy of top makers of European, American, Japanese, Korean, and Chinese automobiles. In particular, analysis is carried out on the cause of the rapid growth of European, American, and Korean makers in the passenger vehicle market and the slow growth of Japanese makers, especially, Toyota, Honda, and Chinese makers. In order to adapt to the environmental change in the Chinese automobile market, European and American makers like Volkwagen （VW） and General Motors （GM） have developed full model line-up strategies focusing on compact cars while utilizing the advantages of the annual production of their full model line-up and giving priority to local part procurement. What＇s more, Korea＇s Hyundai has converted its car model strategy from mid-sized cars into compact cars in accordance with the changes in the Chinese market. Through successful product development adjusting to local needs, Hyundai has firmly entrenched its brand name. For Honda and Toyota, the slow conversion from mid-sized cars to compact cars and the inability to decrease costs due to the slow development of local part procurement are the causes of their delayed development in the Chinese market.展开更多
To solve the problem of corrosion acoustic emission （AE） source feature extraction and recognition, the AE detection validation and the amplitude-frequency characteristics were derived in theory. The amplitude of AE...To solve the problem of corrosion acoustic emission （AE） source feature extraction and recognition, the AE detection validation and the amplitude-frequency characteristics were derived in theory. The amplitude of AE signal generated by bubble burst is proportional to its radius square and the liquid level, while the AE signal frequency is inversely proportional to the bubble radius. The AE signal amplitude of the steel and the steel corrosion product cracking is proportional to the local stress, and the AE signal frequency is proportional to the crack propagation velocity and inversely proportional to the crack propagation distance. Three Q235 specimens were separately immersed in the solution of 10% FeC13.6H20, 5% CuSOa.5H20 and 10% FeC13.6H20 with 0.01 mol/L HCL. The AE systems with high frequency and low frequency were used to detect the whole corrosion process AE signals. The AE signals of Q235 steel and the steel corrosion products cracking were detected as the verification experiment. The AE signals from different sources could be distinguished by AE hits count and the power spectrum. It is coincident with theoretical analysis. These conclusions have significant guidance for the corrosion detection and evaluation by on-line acoustic emission detecting.展开更多
文摘This paper compares and analyzes the changes in the Chinese automobile market in recent years as well as the competition strategy of top makers of European, American, Japanese, Korean, and Chinese automobiles. In particular, analysis is carried out on the cause of the rapid growth of European, American, and Korean makers in the passenger vehicle market and the slow growth of Japanese makers, especially, Toyota, Honda, and Chinese makers. In order to adapt to the environmental change in the Chinese automobile market, European and American makers like Volkwagen （VW） and General Motors （GM） have developed full model line-up strategies focusing on compact cars while utilizing the advantages of the annual production of their full model line-up and giving priority to local part procurement. What＇s more, Korea＇s Hyundai has converted its car model strategy from mid-sized cars into compact cars in accordance with the changes in the Chinese market. Through successful product development adjusting to local needs, Hyundai has firmly entrenched its brand name. For Honda and Toyota, the slow conversion from mid-sized cars to compact cars and the inability to decrease costs due to the slow development of local part procurement are the causes of their delayed development in the Chinese market.
基金supported by the Innovation Team Project of Liaoning Provincial Education Department(LT2010082)
文摘To solve the problem of corrosion acoustic emission （AE） source feature extraction and recognition, the AE detection validation and the amplitude-frequency characteristics were derived in theory. The amplitude of AE signal generated by bubble burst is proportional to its radius square and the liquid level, while the AE signal frequency is inversely proportional to the bubble radius. The AE signal amplitude of the steel and the steel corrosion product cracking is proportional to the local stress, and the AE signal frequency is proportional to the crack propagation velocity and inversely proportional to the crack propagation distance. Three Q235 specimens were separately immersed in the solution of 10% FeC13.6H20, 5% CuSOa.5H20 and 10% FeC13.6H20 with 0.01 mol/L HCL. The AE systems with high frequency and low frequency were used to detect the whole corrosion process AE signals. The AE signals of Q235 steel and the steel corrosion products cracking were detected as the verification experiment. The AE signals from different sources could be distinguished by AE hits count and the power spectrum. It is coincident with theoretical analysis. These conclusions have significant guidance for the corrosion detection and evaluation by on-line acoustic emission detecting.
