Horizontal curve design to accommodate tractive and braking forces and lateral load transfer of passenger cars and two-axle trucks

Mavromatis, S; Psarianos, B

dc.contributor.author	Mavromatis, S	en
dc.contributor.author	Psarianos, B	en
dc.date.accessioned	2014-03-01T02:48:41Z
dc.date.available	2014-03-01T02:48:41Z
dc.date.issued	1998	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34006
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-33645022293&partnerID=40&md5=58f81dd1bd550165e59fc8fdbee9ee8c	en
dc.subject	Friction	en
dc.subject	Operating speed	en
dc.subject	Rollover	en
dc.subject	Safe speed	en
dc.subject	Skid	en
dc.subject	Vehicle dynamics	en
dc.subject.other	Axles	en
dc.subject.other	Brakes	en
dc.subject.other	Loads (forces)	en
dc.subject.other	Roads and streets	en
dc.subject.other	Speed control	en
dc.subject.other	Operating speed	en
dc.subject.other	Rollover	en
dc.subject.other	Safe speed	en
dc.subject.other	Skid	en
dc.subject.other	Vehicle dynamics	en
dc.subject.other	Trucks	en
dc.title	Horizontal curve design to accommodate tractive and braking forces and lateral load transfer of passenger cars and two-axle trucks	en
heal.type	conferenceItem	en
heal.publicationDate	1998	en
heal.abstract	A dynamic model was developed to describe both the driving and braking mode of certain types of passenger vehicles and two-axle trucks in steady-state cornering. The influence of certain vehicle technical characteristics, road geometry, and tire friction which included: vehicle speed/ wheel drive/ sprung and unsprung mass and it's position of gravity center/ aerodynamic drag/ vertical lift/ loading conditions/ track width/ wheel-base/ roll center/ suspension roll stiffness/ cornering stiffness/ grade/ superelevation rate/ rolling resistance and tire-road adhesion values were inserted in the model and the minimum horizontal radius was determined. It was found that while the passenger cars in most cases could safely negotiate a curve according to RTAC-86 design guidelines, the safe motion of the examined trucks was intruded not only in tractive but in braking motion as well. Furthermore, the safe speed from the dynamic model for each of the examined vehicle types was determined, and multiple regression analysis were applied to investigate the variables that influence it most. The derived safe speed formula was correlated to the operating speed formula extracted from measurements that took place on two lane rural roads in Greece, and the areas of horizontal curvature where conflict between safe and operating speed was observed, were pointed out. The results revealed that the two-axle trucks in certain loading conditions -loaded in steep downgrades, unloaded in tractive motion- were the critical examined vehicles from the safety point of view.	en
heal.journalName	Proceedings, Annual Conference - Canadian Society for Civil Engineering	en
dc.identifier.volume	4 A	en
dc.identifier.spage	357	en
dc.identifier.epage	371	en