Four wheel steering (4WS) is a concept proven to be beneficial in low speed
applications requiring large steering angles, which is the case in city traffic or
parking. By steering the rear wheels in the opposite direction to the front ones,
maneuverability can be improved. However, a conflict is encountered at high speeds
for all the steering strategies developed. If sharper response is achieved, this is at the
expense of undesirably large vehicle sideslip angles. On the other hand, small vehicle
sideslip angles are associated with heavy understeering behavior. It is not possible to
improve both simultaneously in case of two-axle 4WS vehicles.
The object of this study is the simulation of various steering configurations for
multi-axle vehicles in an attempt to find a means of solving the problem of 4WS and
to determine the best steering strategy. In addition to two-axle vehicles which have
been extensively studied in literature, three- and four-axle vehicles are taken into
consideration. By extending the strategies used for 4WS two-axle vehicles, new
strategies are established for three and four-axle vehicles. An integrated non-linear
ride and handling model in Matlab & / Simulink environment considering sprung and
unsprung mass motions, wheel and tire dynamics, is used for simulations. It is shown
by case studies that, with the application of the derived strategies for three and fouraxle
vehicles, lateral acceleration and yaw velocity responses can be improved
without degrading vehicle sideslip angle.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12607387/index.pdf |
| Date | 01 July 2006 |
| Creators | Bayar, Kerem |
| Contributors | Unlusoy, Samim Y. |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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