Abstract
Purpose. Wear parameters clarification in wear simulation is an actual goal because of absence of corresponding data for freight cars in condition of using them on Russian railways. Research is devoted to development of dynamic models of wagons on three-peace two-axle models 18-9810 and 18-9855 bogies with maximum axle-loads 23,5 ts and 25 ts, and to choice of factors, with varying which parameters in the model of wheel wear can be identified. Methodology. The problem is solved by method of mathematic simulation in «MEDYNA» software. Wear calculation is based on abrasive wear theory (Archard’s theory). Findings. Clarification of wheels’ wear model may be done with varying of friction coefficient between wheel and rail for different wheel profile areas (flange and tread), wear coefficient in Archard’s model for mild and heavy wear and transition between them. Originality. Dynamic models of universal gondola on models 18-9810 and 18-9855 bogies are developed. It is established, that rail treads irregularities size effect wheel wear insignificantly, when car is running on circle track of constant radius. Practical value. Developed dynamic models of wagons on models 18-9810 and 18-9855 bogies may be used in wear simulation, determination of car running characteristics, interaction of car and rail of different type, construction, condition and etc. Research results of some factors influence on freight car wheel wear may be interesting for people, who study this problem.
Highlights
Research is devoted to development of dynamic models of wagons on three-peace two-axle models 18-9810 and 18-9855 bogies with maximum axle-loads
That rail treads irregularities size effect wheel wear insignificantly, when car is running on circle track of constant radius
Developed dynamic models of wagons on models 18-9810 and 18-9855 bogies may be used in wear simulation, determination of car running characteristics, interaction of car and rail of different type, construction, condition and etc
Summary
Для этого на данном этапе проводилась разработка математических моделей движения вагонов на двухосных трехэлементных тележках 18-9810 и 18-9855 с учетом износа профилей колес, а также выбор факторов, варьированием которых можно идентифицировать параметры в модели износа профилей колес. Обзор работ в области моделирования износа колес показал необходимость исследования влияния величины неровностей пути на него, а также задание коэффициента трения в контакте в виде отдельных значений для зон поверхности катания и гребня колеса. Исследование влияния различного коэффициента трения между колесом и рельсом для различных зон профиля колеса проводилось для вагона, движущегося по пути, аналогичному описанному выше, с неровностями по РД 32.68. – коэффициента трения между колесом и рельсом для различных зон профиля колеса – гребня и поверхности катания (принимается усредненным для различных погодных условий, наблюдаемых при испытаниях);. 1 – неизношенный профиль; 2 – профиль при коэффициенте трения 0.25; 3 – профиль при коэффициенте трения 0,3 на гребне и 0,25 на поверхности катания
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