A Parameterized Simulation Model for Multi-Axle Vehicle

2011 ◽  
Vol 186 ◽  
pp. 170-175
Author(s):  
Li Qiang Jin ◽  
Chuan Xue Song
Keyword(s):  
Simulation Model ◽  
Present Model ◽  
Equations Of Motion ◽  
Steering System ◽  
Slip Angle ◽  
Vehicle Stability ◽  
Tire Model ◽  
Body System ◽  
Turning Motion ◽  
Turning Radius

This paper presents a mathematical model for multi-axle vehicles Inclusive of steering system, suspension system, tire model, body system. Considering possible factors related to turning motion such as vehicle configuration and suspension, equations of motion were constructed to predict steerability and stability of these vehicles. Turning radius, slip angle at the mass center, and each wheel velocity were obtained by numerically solving the equations. The simulation model is made by MATLAB based on the mathematic equation. To analyze the influence of the wheelbase layout on vehicle stability, driving performance and stability of the vehicle with three wheelbase layout is simulated based on the present model. It is concluded that the wheelbase between second axle and third axle should be long to get better stability when vehicle turning with rear axles.

Effect of Active Roll Stabilizer System Performance on Vehicle Stability

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
Essam M. Allam ◽  
M.A.A. Emam
Keyword(s):  
Simulation Model ◽  
Significant Influence ◽  
System Performance ◽  
Slip Angle ◽  
Vehicle Stability ◽  
Vehicle Speed ◽  
Road Vehicles ◽  
Side Slip Angle ◽  
Yaw Rate ◽  
Vehicle Systems

To investigate the effect of active roll stabilizer system performance on vehicle stability, it is needed to study the effects of varying speeds of the on-road vehicles under different wheel steer angle on the roll angle, side slip angle and yaw rate on the vehicle stability. For a safe drive, when a vehicle is cornering it should not lose its stability on road. In this paper the response of passive and active roll stabilizer vehicle systems are simulated and compared against each other. The results of the simulation model showed a significant influence of the vehicle speed on the vehicle stability under different wheel steer angles.

All Wheel Steering System

2015 ◽  
Vol 7 (02) ◽  
pp. 105-108
Author(s):  
Sanjay Kumar Singh ◽  
Sanjay Kumar Sharma ◽  
Akhilesh Kumar Verma
Keyword(s):  
Steering System ◽  
Vehicle Stability ◽  
Handling System ◽  
Low Speed ◽  
Steering Mechanism ◽  
All Wheel Steering ◽  
Response Increase ◽  
Vehicle Response ◽  
Turning Radius ◽  
System Mechanism

Now a days most of the vehicles are use the two wheel steering system mechanism as their main handling system but, the efficiency of two wheel steering vehicle is proven to be low compared to all wheel steering vehicles. All wheel steering system can be employed in some vehicles to improve vehicle response, increase vehicle stability while moving at certain speed, or to decrease turning radius at low speed. All wheel steering is a technologically, tremendous effort on heavy loaded vehicles. Hence, there is a requirement of a mechanism which result in less turning radius and it can be achieved by implementing all wheel steering mechanism instead of regular two wheel steering.

An Investigation into the Dynamic Stability of Steering Systems

1968 ◽  
Vol 183 (1) ◽  
pp. 113-124
Author(s):  
R. P. La Barre ◽  
B. Mills
Keyword(s):  
Dynamic Stability ◽  
Equations Of Motion ◽  
Harmonic Approximation ◽  
Steering System ◽  
Experimental Results ◽  
Historical Background ◽  
Slip Angle ◽  
Relaxation Properties ◽  
Nonlinear Variation

The historical background of the automobile shimmy problem is outlined. The behaviour of a suspension and steering system is predicted using a one-term harmonic approximation to the solution of the simplified equations of motion of the system. These equations include the effects of the nonlinear variation of the tyre aligning torque with applied slip angle and of the relaxation properties of the tyre. The unstable frequency regions of the steering system are predicted with and without coupling of the steering and vertical suspension motions. An estimate of the level of damping required to suppress the shimmy motion is made. An apparatus for the determination of the relevant tyre properties is described. The experimental results obtained for the behaviour of a laboratory suspension unit are compared with those predicted theoretically and the agreement is found to be reasonable.

scholarly journals Co-Simulation Study for Fuzzy ESP Control Strategy on Vehicle

2014 ◽  
Vol 8 (1) ◽  
pp. 682-688 ◽  
Author(s):  
Shengqin Li ◽  
Li Zhao ◽  
Chunbo Yang
Keyword(s):  
System Dynamics ◽  
Fuzzy Controller ◽  
Steering System ◽  
Slip Angle ◽  
Body System ◽  
The Road ◽  
Yaw Rate ◽  
System Body ◽  
The Right ◽  
Multi Body

ESP can help the road vehicle to improve driving dynamics and prevent accidents which result from loss of control. Based on the theory and account method of Multi-body System Dynamics, the Multi-body System Dynamics model of an A-class car is built by the ADAMS/Car software, which includes steering system, front and rear suspension, braking system, body, and so on. In order to study the handling stability of vehicle with ESP control system, the vehicle yaw rate is set as the controlling aim, to build the fuzzy controller of ESP. The performance evaluation methods of vehicle with ESP are proposed to evaluate the handling stability of vehicle with ESP. The results show that the vehicle with ESP can keep the right path, the yaw rate and the vehicle slip angle is all controlled better. The handling stability of vehicle can be improved.

An Analytical Transient Tire Model

2001 ◽  
Vol 29 (2) ◽  
pp. 108-132 ◽  
Author(s):  
A. Ghazi Zadeh ◽  
A. Fahim
Keyword(s):  
Transient Behavior ◽  
Stability Control ◽  
Vehicle Stability ◽  
Tire Model ◽  
Steering Angle ◽  
First Order ◽  
Vehicle Stability Control ◽  
Proposed Model ◽  
Depth Study ◽  
And Performance

Abstract The dynamics of a vehicle's tires is a major contributor to the vehicle stability, control, and performance. A better understanding of the handling performance and lateral stability of the vehicle can be achieved by an in-depth study of the transient behavior of the tire. In this article, the transient response of the tire to a steering angle input is examined and an analytical second order tire model is proposed. This model provides a means for a better understanding of the transient behavior of the tire. The proposed model is also applied to a vehicle model and its performance is compared with a first order tire model.

Lateral Tire Forces on Wet Roads

1977 ◽  
Vol 5 (2) ◽  
pp. 75-82 ◽  
Author(s):  
A. Schallamach
Keyword(s):  
Normal Load ◽  
The Self ◽  
Experimental Results ◽  
Slip Angle ◽  
Tire Model ◽  
Side Force ◽  
Tire Forces

Abstract Expressions are derived for side force and self-aligning torque of a simple tire model on wet roads with velocity-dependent friction. The results agree qualitatively with experimental results at moderate speeds. In particular, the theory correctly predicts that the self-aligning torque can become negative under easily realizable circumstances. The slip angle at which the torque reverses sign should increase with the normal load.

Theoretical Tire Model Considering Two-Dimensional Contact Patch for Force and Moment

2021 ◽  
Author(s):  
Y. Nakajima ◽  
S. Hidano
Keyword(s):  
Finite Element Method ◽  
Shear Force ◽  
The Self ◽  
Slip Angle ◽  
Force Distribution ◽  
Two Dimensional ◽  
Tire Model ◽  
Side Force ◽  
Contact Patch ◽  
Proposed Model

ABSTRACT The new theoretical tire model for force and moment has been developed by considering a two-dimensional contact patch of a tire with rib pattern. The force and moment are compared with the calculation by finite element method (FEM). The side force predicted by the theoretical tire model is somewhat undervalued as compared with the FEM calculation, while the self-aligning torque predicted by the theoretical tire model agrees well with the FEM calculation. The shear force distribution in a two-dimensional contact patch under slip angle predicted by the proposed model qualitatively agrees with the FEM calculation. Furthermore, the distribution of the adhesion region and sliding region in a two-dimensional contact patch predicted by the theoretical tire model qualitatively agrees with the FEM calculation.

scholarly journals Thermomechanical Couplings in Aircraft Tire Rolling/Sliding Modeling

2011 ◽  
Vol 274 ◽  
pp. 81-90 ◽  
Author(s):  
Ange Kongo Kondé ◽  
Iulian Rosu ◽  
F. Lebon ◽  
L. Seguin ◽  
Olivier Brardo ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Thermal Effects ◽  
Coulomb Friction ◽  
Large Deformations ◽  
Element Model ◽  
Slip Angle ◽  
Tire Model ◽  
Vertical Load ◽  
Coulomb Friction Law ◽  
Lateral Friction

This paper presents a finite element model for the simulation of aircraft tire rolling. Large deformations, material incompressibility, heterogeneities of the material, unilateral contact with Coulomb friction law are taken into account. The numerical model will allow estimating the forces in the contact patch - even in critical and extreme conditions for the aircraft safety and security. We show the influence of loading parameters (vertical load, velocity, inflating pressure) and slip angle on the Self Aligning torque and on the lateral friction coefficient. A friction coefficient law corresponding to Chichinadze model is considered to take into account thermal effects in the aircraft tire model behaviour.

scholarly journals Spontaneously Broken Gauge Symmetry in a Bose Gas with Constant Particle Number

2017 ◽  
Vol 16 (01) ◽  
pp. 1750009
Author(s):  
A. Schelle
Keyword(s):  
Gauge Symmetry ◽  
Particle Number ◽  
Present Model ◽  
Phase Distribution ◽  
Equations Of Motion ◽  
Einstein Condensation ◽  
Bose Einstein Condensation ◽  
Gauge Symmetries ◽  
Non Local ◽  
Bose Einstein

The interplay between spontaneously broken gauge symmetries and Bose–Einstein condensation has long been controversially discussed in science, since the equations of motion are invariant under phase transformations. Within the present model, it is illustrated that spontaneous symmetry breaking appears as a non-local process in position space, but within disjoint subspaces of the underlying Hilbert space. Numerical simulations show that it is the symmetry of the relative phase distribution between condensate and non-condensate quantum fields which is spontaneously broken when passing the critical temperature for Bose–Einstein condensation. Since the total number of gas particles remains constant over time, the global U(1)-gauge symmetry of the system is preserved.

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