2026-10-11T20:56:45Z https://www.scidb.cn/oai

10.57760/sciencedb.Tribology.00081 2026-06-22T15:37:25Z

2026-06-22 Process of Dynamic Low Adhesion Behavior between Wheel and Rail at High Speeds Considering Rolling-Sliding-Jumping Contact doi:10.57760/sciencedb.tribology.00081 en Ignoring variations of the wheel-rail adhesion requirement during commercial running, three mechanisms of dynamic low adhesion are identified from the definition of the maximum creep force between wheel and rail under dynamic conditions. Consequently, three types of dynamic low adhesion problems were summarized, i.e., those caused by excessively low adhesion coefficient, excessively low normal contact force during unloading, and insufficient to meet requirements in both the longitudinal and the lateral directions. Dynamic low adhesion was scarcely studied in the past due to its insignificance, while has become an important issue at present because of continuous increase of the wheel-rail adhesion exploitation rate in the past decades. Based on published and the latest researches, mechanisms of three types of dynamic low adhesion problems are presented with the focus on high-speed wheel-rail systems. The transient wheel-rail "rolling-sliding-jumping" contact model and the vehicle-track coupled dynamics model are employed, and cases with low adhesion coefficients, wide-wavelength irregularities, and adhesion saturation in the longitudinal are separately taken as typical examples. To clarify each mechanism more clearly and avoid unnecessary difficulties in explanations and understanding, three mechanisms of dynamic low adhesion are separately presented. Dynamic characteristics of the normal wheel-rail contact force, creep force/creepage, contact patch/contact stresses/adhesion-slip distinction, instantaneous adhesion exploitation rate, and creep curves are analyzed in detail together with influences of some key parameters. In a word, the research process of dynamic low adhesion at high speeds is explained. In reality, three low adhesion problems may co-exist in the meantime, explaining dispersions of measured adhesion data to a large certain extent, but further mechanism studies and development of technologies against dynamic low adhesion are still required. More detailed research should be conducted in future to ensure the operating performance of future high-speed trains.  high speed rail; wheel-rail adhesion; wide-frequency dynamics; rolling contact; dynamic low adhesion; transient adhesion exploitation rate Zhao Xin Huang Shuangchao Geng Chen Cai Yuanwu Wen Zefeng Liangshulin PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank