Dynamic-Deflection Tire Modeling for Low-Speed Vehicle Lateral Dynamics

2007 ◽  
Vol 129 (4) ◽  
pp. 393-403 ◽  
Author(s):  
Shiang-Lung Koo ◽  
Han-Shue Tan
Keyword(s):  
Resonant Mode ◽  
Steering Control ◽  
Dynamic Interactions ◽  
Conventional Vehicle ◽  
Lateral Dynamics ◽  
Dynamics And Control ◽  
Low Speeds ◽  
And Control ◽  
Tire Models ◽  
Vehicle Lateral Dynamics

Vehicle lateral dynamics depends heavily on the tire characteristics. Accordingly, a number of tire models were developed to capture the tire behaviors. Among them, the empirical tire models, generally obtained through lab tests, are commonly used in vehicle dynamics and control analyses. However, the empirical models often do not reflect the actual dynamic interactions between tire and vehicle under real operational environments, especially at low vehicle speeds. This paper proposes a dynamic-deflection tire model, which can be incorporated with any conventional vehicle model to accurately predict the resonant mode in the vehicle yaw motion as well as steering lag behavior at low speeds. A snowblower was tested as an example and the data gathered verified the predictions from the improved vehicle lateral model. The simulation results show that these often-ignored characteristics can significantly impact the steering control designs for vehicle lane-keeping maneuvers at low speeds.

Improvement of Vehicle Lateral Dynamics by Active Front Steering Control

2004 ◽  
Author(s):  
W. A. H. Oraby ◽  
S. M. El-Demerdash ◽  
A. M. Selim ◽  
A. Faizz ◽  
D. A. Crolla
Keyword(s):  
Steering Control ◽  
Lateral Dynamics ◽  
Active Front Steering ◽  
Active Front Steering Control ◽  
Vehicle Lateral Dynamics

Lateral Dynamics and Control of a 4WD Vehicle Using Sliding Modes

1996 ◽  
Vol 29 (1) ◽  
pp. 7957-7962
Author(s):  
P. Serra ◽  
M. Innocenti ◽  
A. Balestrino
Keyword(s):  
Sliding Modes ◽  
Lateral Dynamics ◽  
Dynamics And Control ◽  
And Control

Planar, Large Excursion Bond Graph Model for Full Suspension Mountain Biking

2005 ◽  
Author(s):  
Robin C. Redfield
Keyword(s):  
Initial Conditions ◽  
Contact Point ◽  
Graph Model ◽  
Bond Graph ◽  
Mountain Bike ◽  
Dynamic Interactions ◽  
Dynamics And Control ◽  
Ground Profile ◽  
And Control ◽  
Main Frame

A bond graph model of a fully suspended mountain bike and non-seated rider is created to develop predictions for the performance of mountain bikes during large excursion maneuvers such as drops, jumps, crashes, and rough terrain riding. The model assumes planar dynamics, a single pivot full suspension bicycle, and a rigid-body rider suspended from the bicycle. The main frame, front fork, rear triangle, two wheels, and rider are modeled as separate bodies interconnected at the main pivot, telescoping fork, pedals, handlebars, and axles. Suspensions are between the main frame and front fork, main frame and rear triangle, handlebars and rider (arms) and pedals and rider (legs). An algorithm is used to allow tracking of a virtual tire-ground contact point for events that separate the wheels from the ground. Significant excursions of motion are allowed to model major slope changes, separations from the ground, and large rotational events (endos). The bond graph approach allows kinematics to drive the significant dynamic interactions with the effort (force and torque) relationships being derived for “free”. Simulations of a ground profile with a rise followed by a steep drop are performed for various initial conditions to qualitatively validate the predictions of the model. Rider strategies for negotiating the drop are examined in the process. Overarching goals of the research are to examine and understand the dynamics and control of interactions between a cyclist and mountain bike. Specific, longer term, goals are to understand the improvement in performance afforded by an experienced rider, to hypothesize human control algorithms that allow riders to perform maneuvers well and safely, to predict structural bike and body forces from these maneuvers, and to quantify performance differences between hard-tail and various full suspension bicycles.

PROJECT ON ELECTRONIC STEERING SYSYTEM

2018 ◽  
Vol 4 (5) ◽  
pp. 7
Author(s):  
Shivam Dwivedi ◽  
Prof. Vikas Gupta
Keyword(s):  
Steering System ◽  
Essential Elements ◽  
Variable Pressure ◽  
Passenger Cars ◽  
Control Techniques ◽  
Steering Mechanism ◽  
Dynamics And Control ◽  
Active Research ◽  
Electronic Steering ◽  
And Control

As the four-wheel steering (4WS) system has great potentials, many researchers' attention was attracted to this technique and active research was made. As a result, passenger cars equipped with 4WS systems were put on the market a few years ago. This report tries to identify the essential elements of the 4WS technology in terms of vehicle dynamics and control techniques. Based on the findings of this investigation, the report gives a mechanism of electronically controlling the steering system depending on the variable pressure applied on it. This enhances the controlling and smoothens the operation of steering mechanism.

Sign in / Sign up

Export Citation Format

Share Document