Authors: Basar Ozkan; Erchan Aptoula; A. Tayfun Heren; Hasan Mandaci
Addresses: Department of Mechanical Engineering, Okan University, Istanbul 34959, Turkey ' Department of Computer Engineering, Okan University, Istanbul 34959, Turkey ' TIRSAN Treyler San. A.?., Adapazar?, Sakarya, 54010, Turkey ' TIRSAN Treyler San. A.?., Adapazar?, Sakarya, 54010, Turkey
Abstract: Steering the rear wheels of semi-trailers has become common to improve the manoeuvrability of the vehicle. Command steering is one of the methods of steering semi-trailers. Depending on the articulation angle, a mechanism steers the rear wheels accordingly. In this paper, this mechanism is optimised to meet three goals. The first goal is staying within the boundaries of the road for specific tests. The second goal is to decrease tyre wear. The third goal is to minimise the difference between the trailer hub angles caused by the left and right hydraulic pistons of the steering system. All of these goals are achieved using a genetic algorithm by searching the parameter space. The hydraulic and mechanical command steer system is also modelled and used in the optimisation process. The complete system is optimised so that the semi-trailer wheels approximate the Ackerman condition as closely as possible.
Keywords: vehicle dynamics; articulated vehicles; path following; command steering; off-tracking; optimisation; genetic algorithms; tractor semi-trailers; tyre wear; trailer hub angles; vehicle modelling; dynamic modelling; Ackerman condition.
International Journal of Vehicle Design, 2016 Vol.71 No.1/2/3/4, pp.258 - 278
Received: 05 Dec 2014
Accepted: 16 Dec 2015
Published online: 02 Sep 2016 *