scholarly journals SIDE SLIP OF WHEELS WITH LOW AND ULTRA-LOW PROFILE TIRES OF A PERSONAL CAR NEGOTIATING A TURN

2021 ◽  
Vol 3 ◽  
pp. 336-342
Author(s):  
Stiliyana Taneva ◽  
Krasimir Ambarev
Keyword(s):  
Slip Angle ◽  
Software System ◽  
Interactive Software ◽  
Lateral Loads ◽  
Side Slip Angle ◽  
Handling Characteristics ◽  
Low Profile ◽  
Pneumatic Tires

This article studies the influence of the speed of a car with low and ultra-low profile tires, 14ʹʹ and 16ʹʹ, negotiating a turn through an interactive software system developed by us in the MATLAB environment. The changes of the normal and lateral loads of the wheels are obtained and the characteristics of the side slip angle (known as side slip) of the pneumatic tires are determined. Taking into account the side slip of the wheels, the software determines the center of the turn. The characteristics for the normal and lateral loads and of the side slip of the wheels for both types of tires are given. The influence of the tire profile on the handling characteristics is analysed. Recommendations are proposed for a personal car’s motion in a turn with both types of tires.

Vehicle side-slip angle estimation on a banked and low-friction road

2017 ◽  
Vol 232 (12) ◽  
pp. 1584-1596 ◽  
Author(s):  
Martin Haudum ◽  
Johannes Edelmann ◽  
Manfred Plöchl ◽  
Manuel Höll
Keyword(s):  
Vehicle Dynamics ◽  
Stability Control ◽  
Velocity Estimation ◽  
Slip Angle ◽  
State Variables ◽  
Low Friction ◽  
Bank Angle ◽  
Angle Estimation ◽  
Side Slip Angle ◽  
Handling Characteristics

The effective application of integrated vehicle dynamics control and automatic driving require consistent vehicle state variables and parameters. Considering lateral vehicle dynamics, the yaw rate and (estimated) vehicle side-slip angle are the minimum set of state variables that can give insight into the handling characteristics of a vehicle. Various methods of vehicle side-slip angle (lateral velocity) estimation have been tested in virtual and real world applications, in particular on a horizontal dry road. Vehicle side-slip angle, however, is not only affected by the (steering) commands of the driver, and possibly by a vehicle dynamics controller, but can also arise from a banked road or result from a low-friction surface, changing tyre–road contact. The combined effects require a comprehensive estimation approach, which is less often touched upon in the literature. Based on earlier findings on important aspects of observability, the paper addresses a modular vehicle side-slip angle estimation approach that is particularly focused upon practical aspects of modelling and design. Estimation of the combined vehicle side-slip angle, road bank angle and maximum tyre–road friction coefficient has been broadly tested with a vehicle equipped with an electronic stability control (ESC) and electric power-assisted steering (EPS) sensor configuration, for various road conditions, driving situations and vehicle/tyre setups.

Examination of different models following types of yaw moment control strategy for improving handling safety of a car-caravan combination

2003 ◽  
Vol 217 (7) ◽  
pp. 561-571 ◽  
Author(s):  
O Mokhiamar ◽  
M Abe
Keyword(s):  
Lateral Force ◽  
Slip Angle ◽  
Side Slip Angle ◽  
Yaw Control ◽  
Handling Characteristics ◽  
Bicycle Model ◽  
Model Response ◽  
Single Vehicle ◽  
Yaw Moment Control ◽  
Moment Control

This paper examines the effect of two model responses on the performance of model following types of direct yaw control (DYC). The model responses are the side-slip angle and yaw rate vehicle response of two-degree-of-freedom vehicle motion (bicycle model). The controls aim primarily at stabilizing the handling behaviour of a car-caravan combination as well as making its handling characteristics close to those of a single vehicle. Sensing of the lateral force exerted on a hitch point is essential for the control systems proposed. The estimated side-slip angle using the model observer was compared with the real side-slip angle measured by optical side-slip sensors. The effect of the model response is proved by computer simulations of a closed-loop driver-vehicle system subjected to evasive lane change with braking. It is found that the influence of the model response has a significant effect on the control performance.

Stability Optimal Control Based on 15-Dof Vehicle Model

2011 ◽  
Vol 299-300 ◽  
pp. 1266-1270 ◽  
Author(s):  
Xiao Bin Fan ◽  
Yu Jiang ◽  
Hui Gang Wang
Keyword(s):  
Control System ◽  
Estimation Algorithm ◽  
Stability Control ◽  
Slip Angle ◽  
Vehicle Model ◽  
Simulation Test ◽  
Side Slip Angle ◽  
Handling Characteristics ◽  
Stability Control System ◽  
The Stability

The 15 degrees of nonlinear dynamic vehicle model is established, and then Dugoff and magic formula tire model are studied by comparison. Then the braking system dynamics model and the side-slip angle estimation algorithm are discussed. Stability control system is established based on the control target of combined yaw and side-slip angle with linear 2-dof vehicle handling characteristics model. It shows that control system can perfectly control vehicle driving and can improve the stability of car active safety through the serpent’s simulation test.

Braille System Using an UX Evaluation Methodology Focused on the Use of Methods for Blind Users

2020 ◽  
pp. 96-115
Author(s):  
Vanessa Villalpando Serna ◽  
Jorge E. Herrera ◽  
Teresita de Jesús Álvarez Robles ◽  
Francisco Javier Álvarez Rodríguez
Keyword(s):  
Mobile Device ◽  
Ease Of Use ◽  
Evaluation Methodology ◽  
Blind People ◽  
Software System ◽  
Interactive Software ◽  
Card Sorting ◽  
Blind Users ◽  
Thinking Aloud ◽  
Visual Disabilities

Recently, technology has been advancing and making some aspects of life simpler. Most people have an intelligent mobile device. These devices have applications that support users to perform various tasks. However, these applications are developed for users who don't have any type of disability. This chapter focuses on making use of some tools that exist within the area of software engineering (SE) and user experience (UX) with the aim of developing an interactive software system (ISS). It is expected that this ISS will support people with visual disabilities to learn Braille. To develop the ISS, the authors use modified usability and UX evaluation methods for blind people. The methodology to be followed is based on the ISO15288: 2015 standard of the SE. The methods used to perform the evaluation tests with blind users are card sorting and thinking aloud. Based on the results, it is observed that the ISS complies with most of the UX factors, such as ease of use, accessibility, and utility, so they expect the ISS to be usable for blind people.

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