This paper deals with a newly discovered train hunting mode--- the pulling mode. As the name suggests, the pulling mode is caused by pulling. Compared with the well-known tapered wheel tread mode, we can see that the pulling mode is another train hunting mode. Thus, there are two hunting modes discovered for train movements. The starting point and hunting characteristics of the pulling mode are discussed. Just like the tapered wheel tread mode, the pulling mode has also two degrees of freedom. The pulling mode is generally and easily observed from the movement of a trailer on the road. The mechanism caused the pulling mode in a trailer-car system is first analyzed. In normal operations, lateral displacement (disturbance) to a trailer-car is inevitable no matter how good quality is the system. The pulling power will act to straighten the system at the same time to overshoot to cause hunting. That is why this hunting mode is called the pulling mode. Thus, the existence of the pulling mode is proven. Stable hunting motions can be viewed as the harmonic vibration. Hunting motion curves for the car and trailer were established respectively. The two curves have a difference of π in phase angle, and a difference in amplitudes; however, the period and the wave length are the same. The characteristics of the pulling mode, such as the sway center and the sway momentum etc., are demonstrated mainly by using a trailer-car system because it makes the hunting mode easy to understand. The first degree of freedom of wheelset hunting is the culprit of rail corrugations. The wave length of corrugations was calculated. With understanding the principle of the pulling mode, the knowledge can be applied to solve the corrugation problem caused by the pulling mode. Proper weight distributions within a vehicle are analyzed to try to reduce severer train hunting. Power distribution can be a factor to cause the polling mode hunting. Some other measures can also be taken to reduce the pulling mode hunting. A hunting eliminator can be developed to eliminate hunting totally.
| Published in | Innovation (Volume 3, Issue 4) |
| DOI | 10.11648/j.innov.20220304.13 |
| Page(s) | 98-105 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2022. Published by Science Publishing Group |
Train Hunting Modes, The Pulling Mode, The Tapered Wheel Tread Mode, Degree of Freedom, Wave Length of Corrugation, Vehicle Sway, Hunting Alleviation And Elimination
| [1] | Jack Youqin Huang, Principles of Wheelset Hunting and Construction of Total Solution to Hunting, Engineering Physics. Volume 5, Issue 2, December 2021, pp. 29-39. doi: 10.11648/j.ep.20210502.12. |
| [2] | Jack Youqin Huang, DRAFT, Proceedings of the 2009 ASME Joint Rail Conference JRC2009 March 3-5, 2009, Pueblo, Colorado, USA. JRC2009-63033. |
| [3] | William. T. Thomson, “Theory of Vibration with Applications”, Third Edition, Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, California, Prentice Hall, Englewood Cliffs, New Jersey 07632, 1988. |
| [4] | Trailer Sway – Video Review & Discussion - https://mechanicalelements.com/trailer-sway-video-review/ |
| [5] | Union Pacific freight train with rear car problems hunting oscillation https://www.youtube.com/watch?v=5sVbCRLEZCE |
| [6] | B. Betgen, et al., Assessment of the efficiency of railway wheel dampers using laboratory methods within the STARDAMP project, HAL Id: hal-00810782 https://hal.archives-ouvertes.fr/hal-00810782 Submitted on 23 Apr 2012. |
| [7] | J. Y. Huang, “Balance Velocity of Tapered Wheelset and Hunting Eliminator”, Presentation, 2021 IEEE/ASME Joint Rail Conference, USA. |
| [8] | Jack Y. Huang, “Sliding Friction and Rolling Friction of a Wheel”, internal technique paper, High Tech Pressure Safety, Illinois, September 2015. |
| [9] | Jack Y. Huang, “Theory of Wheel Braking with Brake Design and Train Control”, internal technique paper, High Tech Pressure Safety, Illinois, September 2018. |
| [10] | Andrew Duffy, PY105 Notes - Physics - Boston University, http://physics.bu.edu/~duffy/py105.html. |
| [11] | E. Avallone et al, “Mark’s Standard Handbook for Mechanical Engineer”, 9th edition, New York, McGraw-Hill, 1987. |
| [12] | Christopher Sheppard, “RAIL CORRUGATION ISSUES AT BART”, Rail Transit Seminar, May 6, 2013. WRI 2013. |
| [13] | M. Cruz & A. Woelfle, “Wheel/Rail Interface A Meeting in St. Louis”, Rail Transit Seminar, May 6, 2013. WRI 2013. |
| [14] | Tian Li et al, “Nonlinear Dynamics Analysis of Car-trailer Combinations Body Sway considering Steering System Damping”, Engineering 2019 Chinese Control Conference (CCC), 1 July 2019. |
| [15] | Jack Youqin Huang, Nadal’s Limit (L/V) to Wheel Climb and Two Derailment Modes, Engineering Physics. Volume 5, Issue 1, June 2021, pp. 8-14. doi: 10.11648/j.ep.20210501.12. |
APA Style
Jack Youqin Huang. (2022). The Pulling Mode of Hunting and the Root Cause of Corrugation. Innovation, 3(4), 98-105. https://doi.org/10.11648/j.innov.20220304.13
ACS Style
Jack Youqin Huang. The Pulling Mode of Hunting and the Root Cause of Corrugation. Innovation. 2022, 3(4), 98-105. doi: 10.11648/j.innov.20220304.13
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Download@article{10.11648/j.innov.20220304.13,
author = {Jack Youqin Huang},
title = {The Pulling Mode of Hunting and the Root Cause of Corrugation},
journal = {Innovation},
volume = {3},
number = {4},
pages = {98-105},
doi = {10.11648/j.innov.20220304.13},
url = {https://doi.org/10.11648/j.innov.20220304.13},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.innov.20220304.13},
abstract = {This paper deals with a newly discovered train hunting mode--- the pulling mode. As the name suggests, the pulling mode is caused by pulling. Compared with the well-known tapered wheel tread mode, we can see that the pulling mode is another train hunting mode. Thus, there are two hunting modes discovered for train movements. The starting point and hunting characteristics of the pulling mode are discussed. Just like the tapered wheel tread mode, the pulling mode has also two degrees of freedom. The pulling mode is generally and easily observed from the movement of a trailer on the road. The mechanism caused the pulling mode in a trailer-car system is first analyzed. In normal operations, lateral displacement (disturbance) to a trailer-car is inevitable no matter how good quality is the system. The pulling power will act to straighten the system at the same time to overshoot to cause hunting. That is why this hunting mode is called the pulling mode. Thus, the existence of the pulling mode is proven. Stable hunting motions can be viewed as the harmonic vibration. Hunting motion curves for the car and trailer were established respectively. The two curves have a difference of π in phase angle, and a difference in amplitudes; however, the period and the wave length are the same. The characteristics of the pulling mode, such as the sway center and the sway momentum etc., are demonstrated mainly by using a trailer-car system because it makes the hunting mode easy to understand. The first degree of freedom of wheelset hunting is the culprit of rail corrugations. The wave length of corrugations was calculated. With understanding the principle of the pulling mode, the knowledge can be applied to solve the corrugation problem caused by the pulling mode. Proper weight distributions within a vehicle are analyzed to try to reduce severer train hunting. Power distribution can be a factor to cause the polling mode hunting. Some other measures can also be taken to reduce the pulling mode hunting. A hunting eliminator can be developed to eliminate hunting totally.},
year = {2022}
}
TY - JOUR T1 - The Pulling Mode of Hunting and the Root Cause of Corrugation AU - Jack Youqin Huang Y1 - 2022/12/15 PY - 2022 N1 - https://doi.org/10.11648/j.innov.20220304.13 DO - 10.11648/j.innov.20220304.13 T2 - Innovation JF - Innovation JO - Innovation SP - 98 EP - 105 PB - Science Publishing Group SN - 2994-7138 UR - https://doi.org/10.11648/j.innov.20220304.13 AB - This paper deals with a newly discovered train hunting mode--- the pulling mode. As the name suggests, the pulling mode is caused by pulling. Compared with the well-known tapered wheel tread mode, we can see that the pulling mode is another train hunting mode. Thus, there are two hunting modes discovered for train movements. The starting point and hunting characteristics of the pulling mode are discussed. Just like the tapered wheel tread mode, the pulling mode has also two degrees of freedom. The pulling mode is generally and easily observed from the movement of a trailer on the road. The mechanism caused the pulling mode in a trailer-car system is first analyzed. In normal operations, lateral displacement (disturbance) to a trailer-car is inevitable no matter how good quality is the system. The pulling power will act to straighten the system at the same time to overshoot to cause hunting. That is why this hunting mode is called the pulling mode. Thus, the existence of the pulling mode is proven. Stable hunting motions can be viewed as the harmonic vibration. Hunting motion curves for the car and trailer were established respectively. The two curves have a difference of π in phase angle, and a difference in amplitudes; however, the period and the wave length are the same. The characteristics of the pulling mode, such as the sway center and the sway momentum etc., are demonstrated mainly by using a trailer-car system because it makes the hunting mode easy to understand. The first degree of freedom of wheelset hunting is the culprit of rail corrugations. The wave length of corrugations was calculated. With understanding the principle of the pulling mode, the knowledge can be applied to solve the corrugation problem caused by the pulling mode. Proper weight distributions within a vehicle are analyzed to try to reduce severer train hunting. Power distribution can be a factor to cause the polling mode hunting. Some other measures can also be taken to reduce the pulling mode hunting. A hunting eliminator can be developed to eliminate hunting totally. VL - 3 IS - 4 ER -
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