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Study of driver models forside wind disturbances
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

As the development of highways, it is quite normal for buses running in a speed around

100km/h. When buses are running in a high speed, they may suffer from the influence of side

wind disturbances at anytime. Sometimes, it may result in traffic accidents. Therefore, the

study of bus stability under side wind disturbances becomes more and more important. Due to

restrictions of real tests, computer simulation can be used to study this subject. The bus side

wind response character is reflected through the driver’s manoeuvre , so open-loop analysis is

hard to give a comprehensive evaluation of the side wind stability of the bus. Therefore,

closed-loop analysis is studied in this thesis.

An ADAMS bus model and a side wind force model are developed in this thesis, along with

two driver models, the PID control model and the preview curvature model. The driver

models are built in Simulink and co-simulation between ADAMS/View and Simulink is

conducted.

The results of co-simulation show that the two driver models can both control the bus from

deviating from the desired course under side wind disturbances. The PID control model is

simple and shows a very good control effect. The maximum lateral displacement of the bus by

PID control model is just 0.0205m under maximum side wind load 1000N and 2500Nm when

preview time is 1.2s, while it is 0.0702m by preview curvature model, however, it is difficult

to determine the coefficients Kd, Kp, and Ki in the PID controller. The preview curvature

model also shows a good control effect in terms of the maximum lateral displacement and

yaw angle of the bus. Comparing these two models, the PID control model is more sensitive

to deviations, with quicker response and larger steering input.

The bus model system is stable under side wind disturbances. Through driver ’s proper steering manoeuvre, the bus is well controlled. The closed-loop analysis is a good method to study the bus stability under side wind disturbances.

Place, publisher, year, edition, pages
2013. , 48 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2013:52
Keyword [en]
side wind disturbance, bus stability, driver model, PID control model, preview
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-157504OAI: oai:DiVA.org:kth-157504DiVA: diva2:770271
Supervisors
Available from: 2014-12-10 Created: 2014-12-10 Last updated: 2014-12-10Bibliographically approved

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