为深入研究轮轨匹配等效锥度算法,优化现有多种算法在计算服役条件下的磨耗轮轨,结果时常出现较大的差异和波动性问题,解决面对数据缺损型踏面时现有算法无法提供有效计算结果的问题。研究采用了一种基于准弹性模型修正的积分算法,以提...为深入研究轮轨匹配等效锥度算法,优化现有多种算法在计算服役条件下的磨耗轮轨,结果时常出现较大的差异和波动性问题,解决面对数据缺损型踏面时现有算法无法提供有效计算结果的问题。研究采用了一种基于准弹性模型修正的积分算法,以提高磨耗轮轨的匹配计算精度;采用一种缺损型踏面修补算法,能够解决服役中经常遇到的缺损踏面无法计算的问题。计算结果显示,在采用BS EN 15302标准轮轨数据进行名义等效锥度的计算中,结果与标准值误差降低至0.09%。引入随机误差后的等效锥度数值标准差也下降了9.96%,显示了算法的普适性和可靠性。选取国内高速铁路服役中常见的3种踏面:LMD、LMA和LMB10,以及2种轨面:60D和60N,通过计算这些踏面和轨面的磨耗及缺损型数据,验证了算法在面对服役条件下常见的磨耗踏面、缺损踏面、欠打磨轨面、新打磨轨面等计算中均有着良好的适用性,与实际运用经验相符,进一步验证了算法的普适性。展开更多
Since the view that the localized rail third-order bending mode can cause high-order polygonization(mainly 18-23)of high-speed train wheels was put forward in 2017,many scholars have attempted to link a connection bet...Since the view that the localized rail third-order bending mode can cause high-order polygonization(mainly 18-23)of high-speed train wheels was put forward in 2017,many scholars have attempted to link a connection between the localized rail bending modes and wheel polygonization phenomenon and polygonal wheel passing frequency.This paper first establishes a flexible track model considering the structural and parametric characteristics of fasteners,verifies the model by using vehicle tracking test data,then investigates the influence of fastener parameter matching on the localized rail bending modes,and obtains the following conclusions:(1)There is nearly a 1:1 mapping relationship between the localized rail bending modal frequency and polygonal wheel passing(PWP)frequency,which supports that the localized rail bending mode is one of the causes of wheel polygonization.(2)The iron plate of the fastener system plays a role of dynamic vibration absorber in the vehicle-rail coupled system,and the fastener parameters significantly influence the localized rail bending modal vibration.Finally,this paper proposes a design principle of a high-frequency vibration-absorbing fastener,which provides a feasible solution to mitigate the localized rail bending modal vibration and high-order wheel polygonization.Meanwhile,it points out that this measure may induce other high-frequency vibration problems,e.g.,aggravating modal vibration above 800 Hz.Further,this paper proposes a concept of differentiated arrangement of fasteners,suggesting that different high-frequency vibration-absorbing fasteners be installed in different sections of the whole line to make the localized rail bending modal frequency of the whole line disordered,thus disrupting and further mitigating the development of the wheel polygonization.展开更多
文摘为深入研究轮轨匹配等效锥度算法,优化现有多种算法在计算服役条件下的磨耗轮轨,结果时常出现较大的差异和波动性问题,解决面对数据缺损型踏面时现有算法无法提供有效计算结果的问题。研究采用了一种基于准弹性模型修正的积分算法,以提高磨耗轮轨的匹配计算精度;采用一种缺损型踏面修补算法,能够解决服役中经常遇到的缺损踏面无法计算的问题。计算结果显示,在采用BS EN 15302标准轮轨数据进行名义等效锥度的计算中,结果与标准值误差降低至0.09%。引入随机误差后的等效锥度数值标准差也下降了9.96%,显示了算法的普适性和可靠性。选取国内高速铁路服役中常见的3种踏面:LMD、LMA和LMB10,以及2种轨面:60D和60N,通过计算这些踏面和轨面的磨耗及缺损型数据,验证了算法在面对服役条件下常见的磨耗踏面、缺损踏面、欠打磨轨面、新打磨轨面等计算中均有着良好的适用性,与实际运用经验相符,进一步验证了算法的普适性。
基金supported by the National Natural Science Foundation of China(Grant Nos.:52202423,U2268211,and 52475136)the China Postdoctoral Science Foundation(Grant Nos.:2022M712636 and 2023T160546)+1 种基金the Natural Science Foundation of Sichuan Province(Grant No.:2025ZNSFSC0398)the Independent R&D Project of the State Key Laboratory of Traction Power(Grant No.:2023TPL-T14).
文摘Since the view that the localized rail third-order bending mode can cause high-order polygonization(mainly 18-23)of high-speed train wheels was put forward in 2017,many scholars have attempted to link a connection between the localized rail bending modes and wheel polygonization phenomenon and polygonal wheel passing frequency.This paper first establishes a flexible track model considering the structural and parametric characteristics of fasteners,verifies the model by using vehicle tracking test data,then investigates the influence of fastener parameter matching on the localized rail bending modes,and obtains the following conclusions:(1)There is nearly a 1:1 mapping relationship between the localized rail bending modal frequency and polygonal wheel passing(PWP)frequency,which supports that the localized rail bending mode is one of the causes of wheel polygonization.(2)The iron plate of the fastener system plays a role of dynamic vibration absorber in the vehicle-rail coupled system,and the fastener parameters significantly influence the localized rail bending modal vibration.Finally,this paper proposes a design principle of a high-frequency vibration-absorbing fastener,which provides a feasible solution to mitigate the localized rail bending modal vibration and high-order wheel polygonization.Meanwhile,it points out that this measure may induce other high-frequency vibration problems,e.g.,aggravating modal vibration above 800 Hz.Further,this paper proposes a concept of differentiated arrangement of fasteners,suggesting that different high-frequency vibration-absorbing fasteners be installed in different sections of the whole line to make the localized rail bending modal frequency of the whole line disordered,thus disrupting and further mitigating the development of the wheel polygonization.
