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 Wysłany: Pon 21:24, 10 Sty 2011 Temat postu: Shaft length on 2C0 Curve Curving Performance of L |
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Shaft length on 2C0 Curve Curving Performance of Locomotives
Wheel load reduction rate of the transient maximum length of transition curve by the greatest impact, increasing the length of transition curve, and its value to decrease the length of transition curve increases from the 50m to 120m, the wheel load reduction rate of the maximum transient reduce the very large values; and ease the curve length of circular curve the rate of the last round of load reduction had little effect steady-state value. As can be seen from the above analysis, locomotive line through the curve, the most severe operating environment in the transition curve, so locomotive performance curve by the maximum in relief 【Next】 765432OOOOOO turn on page 38 if they like plus plus ∞ 38 were exploration diesel locomotive axle 2005 is ⑦ specimen axis should be the same material, so that the data returned is true. For the crack, the length will have depth,[link widoczny dla zalogowanych], which is complementary to the law. There are different due to different axle attenuation coefficient, testing should be noted that when the specimen through the shaft axis and the sound of the crack situation and the difference between the number of dB; as some of the axle shaft and the test block material on the differences, leading to chaotic waveform when testing, impact The echo height of the crack, while also interfering with the quantitative crack. Therefore, when appropriate, by testing, reducing the number of dB, to achieve uniform standards of medical assessment. ⑧ also artificial depth of 2mm crack detection with the attenuator in the echo height adjustment range of 80% are full screen situation, due to the probe angle and location of artificial cracks of different, the result is not the same , as listed in Table 1. Table 12mm deep artificial Jukou test data tables based on data in the table shows: people detection gear set are connected within the Ministry of page 18 【】 and the curve. Locomotive on the transition curve through performance indicators (mainly the wheel load reduction rate) have improved,[link widoczny dla zalogowanych], through the performance of the entire curve has been improved correspondingly, the locomotive has been enhanced by the speed at the same time. 4 Conclusion (1) When the curve radius is small, the value of the performance index is larger than the radius of curvature slightly worse,[link widoczny dla zalogowanych], but the wheel load reduction rate is different. (2) motorcycle segment through the curves,[link widoczny dla zalogowanych], the maximum value of the performance occurred in the transition curve, but not in the circular curve segment. (3) motorcycle segment through the curve, the index value on the transition curve is a transient value, and in the circular curve segment is a steady-state value. By extending the length of transition curve can significantly reduce the maximum value of the transient. (4) transition curve length of the wheel load reduction rate of large increases with the length of transition curve, the rate of wheel load reduction value decreases rapidly. 2mm 640mm at the side of the artificial crack, with 6. / J, the angle probe is more appropriate. Ministry of Non-detection gear set inside the human 530rll / n at 2mil1 artificial crack, with 8. Small-angle probe to 6. , 7. Suitable for small-angle probe. People outside the Ministry of detection set at 2mm 380mm when the artificial crack, loo than 8. , 9. More suitable for small-angle probe. If the probe is chosen properly, the reflected wave low, easy to misjudge the larger crack into smaller defects. Therefore, the actual detection of the probe to be the right choice and find the maximum echo crack, the real argument is the crack depth quantitative and reliable data. 3 Conclusion locomotive speed has been improving, the tonnage is increasing traction, and the use of the 3O-year DF4 locomotive axle still run in bad conditions. Therefore, the Department of the set of people will continue to trumpet the root of the transverse cracks generate great harm. The necessary measures to prevent the axle fracture is to strictly enforce the Ministry, the Council issued the scope and limits of the process, strengthen the ultrasonic testing of axles, the crack control in the bud. (5) in the development of new standards, you can consider the appropriate length of transition curve increases, so to some extent,[link widoczny dla zalogowanych], can improve the speed of the locomotive through curves. Some conclusions in this paper are essentially based on numerical analysis, although the model is validated through simulation, and uses the results can be achieved on some issues is a reasonable explanation, but it needs to conduct more tests, in the actual circuit test validation.
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