1.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2.Engineering Research Center for Structural Reliability and Application Inspection Technology of Rail Vehicles, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
To investigate the impact of high frequency wheel-rail excitation on vibration-induced damage of bogie frames and improve the accuracy of frequency-domain damage calculations, vibration bench tests of bogie frames under different wheel-rail excitation frequencies and amplitudes were conducted. Critical regions of the bogie frame and the effect from excitation frequencies and amplitudes on the stresses under different excitation conditions were analyzed. In response to the non-Gaussian characteristics of stress signals, the frequency-domain correction method for frame damage calculation was optimized and validated through comparative studies with time-domain methods, conventional frequency-domain methods, and existing frequency-domain correction methods. Based on the optimized frequency-domain correction method, the impact of different excitation conditions on frame damage was systematically investigated. The results reveal that the high-frequency wheel-rail excitation frequencies of 523, 578, and 670 Hz, frequently encountered during train operation, closely align with the natural frequencies of the frame, inducing significant stress responses. At these strong-response excitation frequencies, the root mean square (RMS) values of stress in critical regions which called the frame end zone, arm positioning seat area, brake hanger area, and vertical damper seat area, exhibit maximum increases of 6.9, 2.6, 6.5, and 10.6 times, respectively, compared to non-resonant conditions. Correspondingly, the equivalent damage per 10,000 kilometers amplifies by factors of 987, 109, 653, and 1,139. At strong-response excitation frequencies, increasing the excitation amplitude from 0.075 mm to 0.200 mm resulted in an average increase of approximately 0.5 times in RMS stress and about 3 times in equivalent damage. The proposed optimized frequency-domain correction method reduces the maximum error in frequency-domain damage calculations to below 10% and ensures a more conservative damage assessment for the frame. These findings offer valuable references and data support for the anti-vibration fatigue design of high-speed train bogie frames.
高速列车在线路上实际运行速度在0~350 km · h-1之间,为覆盖整个速度范围,此次试验采用的运行速度及激励频率见表1。试验过程中激励幅值为0.200 mm时,轨道轮运行速度超过300 km · h-1后引发试验台整体强烈振动,存在一定安全隐患,故将此激励幅值下最高运行速度降为300 km · h-1。
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