构架三种常用疲劳强度校核方法对比研究.pdf

50 14 Vol.50 No.14 2 0 1 4 7 JOURNAL OF MECHANICAL ENGINEERING Jul. 2 0 1 4 DOI 10.3901/JME.2014.14.170 * ( 610031) (Multiple rigid body system dynamic simulation, MRBSDS) (Stress response factor, SRF)100 km MRBSDS MRBSDS U270 U260 Study on the Differences between the Three Common Fatigue Strength Analysis Methods for Bogie Frame LI Fansong WU Pingbo ZENG Jing WANG Jianbin (Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031) Abstract The differences between the three common fatigue strength analysis methods for bogie frame are studied. Comparison of the three main methods, the normative loading spectrum from the railway standard, the loading spectrum from multiple rigid body system dynamics simulation(MRBSDS) and the stress spectrum from running test, is conducted on one trailer bogie frame under the same precondition. During the analysis, the quasi-static superposition method is used to convert the loading spectrum to stress spectrum. Among the quasi-static superposition method, stress response factor(SRF) is defined, which is useful for the conversion between loading spectrum and stress spectrum. Equivalent stress of one million kilometers is used to contrast the three methods. Though comparative analysis, fatigue analysis results based on the railway standard are conservative and results from the MRBSDS method could not predict the fatigue life accurately. From the frequency domain comparative analysis, MRBSDS method should adopt the real line spectrum which contains high