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Fourier transform DFT [11]. The accuracy of the low and high frequency ends of the frequency responses is improved through overlapped windowing technique [7, 15]. At the same time, the coherence.... As seen in this figure, the estimated yaw angle is very similar to the actual yaw angle of the vessel. In this figure, the rudder angle has low motion at the wave frequency thanks to the effect......
in Figure 4. According to the collected amount of data points, the 12 IMFs were decomposed from the pressure fluctuation signal. Due to the low frequency and weak oscillation, only the preceding six... spectrum and the difference was quite obvious regarding time and frequency. For the bubble flow in Figure 5(a), energy was mainly concentrated in the low-frequency bands, especially dominated by stable......
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EFFECT OF LOW-FREQUENCY ELECTROMAGNETIC FIELD ON THE AS-CASTING MICROSTRUCTURES AND MECHANICAL PROPERTIES OF HDC 2024 ALUMINUM ALLOY F.Qu1,Y.B.Zuo1,Z.H.Zhao1,J.Z.Cui1,Q.F.Zhu1 (1.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China) Abstract:The influences of the low frequency electromagnetic field on the horizontal......
, Northeastern University, Shenyang 110004, China Received 23 October 2009; accepted 6 September 2010 Abstract: The working principle of LFEC(Low frequency electromagnetic casting) process developed in Northeastern University, China was introduced and the metallurgical results of LFEC were discussed according to the casting practices. The low frequency field around the mold produces Lorenz force......
Processing of Materials of Ministry of Education,Northeastern University, Shenyang 110004, China Received 23 September 2009; accepted 30 January 2010 Abstract: The effects of low frequency... are improved. Key words: low frequency electromagnetic field; ultrasonic field; Mg alloy; DC casting 1 Introduction Grain refinement is an effective way to improve the workability and strengthening......
: The d 120 mm ingots of 7050 aluminum alloy were made by low frequency electromagnetic casting (LFEC) and conventional DC casting process, respectively. After homogenization treatment the ingots were... and final state.
Key words: 7050 aluminum alloy; low frequency electromagnetic casting; microstructures; constituents
Effect of Rare Earth Elements on Low Frequency Fatigue of Hot Rolled Steel 60CrMnMo at High Temperature杨庆祥,吴浩泉,郭景海,丁柏群,吴朝晖摘 要:ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｏｎＬｏｗＦｒｅｑｕｅｎｃｙＦａｔｉｇｕｅｏｆＨｏｔＲｏｌｌｅｄＳｔｅｅｌ６０ＣｒＭｎＭｏａｔＨｉｇｈＴｅｍｐｅｒａｔｕｒｅＹａｎｇＱｉｎｇ－Ｘｉａｎｇ(杨庆祥)；ＷｕＨａｏ－Ｑｕａｎ(吴浩泉)；Ｇｕ...关键词:......Effect of Rare Earth Elements on Low Frequency Fatigue of Hot Rolled Steel 60CrMnMo at High Temperature
来源： 《Journal of Rare Earths1994年第1期》——杨庆祥 吴浩泉 郭景海 丁柏群 吴朝晖
Effect of Rare Earth Elements on Low Frequency Fatigue Cyclic Softening of Hot Rolled Steel 60CrMnMo at High Temperature杨庆祥,吴浩泉,任学军,郭景海摘 要:ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｏｎＬｏｗＦｒｅｑｕｅｎｃｙＦａｔｉｇｕｅＣｙｃｌｉｃＳｏｆｔｅｎｉｎｇｏｆＨｏｔＲｏｌｌｅｄＳｔｅｅｌ６０ＣｒＭｎＭｏａｔＨｉｇｈＴｅｍｐｅｒａｔｕｒｅＹａｎｇＱｉｎｇｘｉａｎｇ；ＷｕＨａｏｑｕａｎ...关键词:......
was defined as low frequency band, 175-250 kHz was defined as the intermediate frequency band, and more than 250 kHz was defined as the high frequency band. The samples had the following several characteristics: 1) High frequency AE signals were produced throughout the rock burst testing. 2) The low frequency signals were less in the initial loading period and tended to increase before the rock burst......
