kąt nabiegania koła
English translation: wheel/wheelset angle of attack
| 09:43 Sep 19, 2020 |
| Polish to English translations [PRO] Tech/Engineering - Transport / Transportation / Shipping | |||||||
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|  Selected response from: geopiet | ||||||
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| 2 | wheel-rail striking angle |
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| 2 | wheel/wheelset angle of attack |
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Answers
55 mins confidence: 
wheel-rail striking angle Explanation: Propozycja na podstawie artykułów w Internecie, także Example sentence(s):
Reference: http://yadda.icm.edu.pl/baztech/element/bwmeta1.element.bazt... Reference: http://zeus.krb.com.pl/?wspolpraca-kola-lokomotyw-z-szyna-w-... |
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1 hr confidence:
| kąt nabiegu koła wheel/wheelset angle of attack Explanation: KRYTERIUM NADALA Kryterium służące do oceny bezpieczeństwa jazdy w zakresie możliwości wykolejenia pojazdu, określone stosunkiem sił Y/Q, gdzie Y – siła poprzeczna działająca na koło w punkcie styku koła z szyną, Q – siła pionowego obciążenia przenoszonego przez koło na szynę w punkcie kontaktu. Jako wartość krytyczną, zgodnie z opracowaniem ORE-B10, przyjmuje się (Y/Q) max = 1,2 dla kąta γ = 700. Wzór Nadala (przy założeniu, że kąt nabiegu α = 0) ma postać: Y/Q = (tg γ – f)/(1 + f • tg γ), gdzie: f – współczynnik tarcia, γ – kąt pochylenia boku obrzeża koła. - http://www.kurierkolejowy.home.pl/www.kolejpedia/regulacje/k... -------------------------------------------------- Note added at 1 hr (2020-09-19 11:20:22 GMT) -------------------------------------------------- Initial and still commonly used practical criterion (limit) of the wheel-climb derailment was introduced by French scientist M.J. Nadal in his article “Theorie de la stabilite des Locomotives” in 1896, based on simplified equilibrium assumption. Considering typical climb-up conditions, as associated with large lateral L and reduced vertical V forces, Nadal established the following well-known formulation for the critical L/V ratio: L TAN(β) – μ –– = ––––––––––– V 1 + μTAN (β) The formula shows that derailment possibility depends only on the wheel flange/rail angle of attack β and the amount of friction µ. - https://www.rtands.com/track-structure/ballast-ties-rail/pre... -- Application of the Nadal Limit to the prediction of wheel climb derailment is presented along with the effect of pertinent geometric and material parameters. Conditions which contribute to this climb include wheelset angle of attack, contact angle, friction and saturation surface properties, and lateral and vertical wheel loads. The Nadal limit is accurate for high angle of attack conditions, as the wheelset rolls forward in quasi-static steady motion leading to a flange climbing scenario. - https://tinyurl.com/y4xfpanr |
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