Physical Handling Tire Model Incorporating Temperature and Inflation Pressure Change Effect

2018 ◽  
Author(s):  
Gibin Gil ◽  
Jeongheon Park
Keyword(s):  
Pressure Change ◽  
Tire Model ◽  
Inflation Pressure ◽  
Change Effect

scholarly journals Characterization and Modelling of Various Sized Mountain Bike Tires and the Effects of Tire Tread Knobs and Inflation Pressure

2020 ◽  
Vol 10 (9) ◽  
pp. 3156 ◽  
Author(s):  
Andrew Dressel ◽  
James Sadauckas
Keyword(s):  
Simple Model ◽  
Lateral Stiffness ◽  
Tire Model ◽  
Laboratory Measurements ◽  
Inflation Pressure ◽  
Mountain Bike ◽  
Basic Model ◽  
Radial Stiffness ◽  
In Series ◽  
Distinguishing Features

Mountain bikes continue to be the largest segment of U.S. bicycle sales, totaling some USD 577.5 million in 2017 alone. One of the distinguishing features of the mountain bike is relatively wide tires with thick, knobby treads. Although some work has been done on characterizing street and commuter bicycle tires, little or no data have been published on off-road bicycle tires. This work presents laboratory measurements of inflated tire profiles, tire contact patch footprints, and force and moment data, as well as static lateral and radial stiffness for various modern mountain bike tire sizes including plus size and fat bike tires. Pacejka’s Motorcycle Magic Formula tire model was applied and used to compare results. A basic model of tire lateral stiffness incorporating individual tread knobs as springs in parallel with the overall tread and the inflated carcass as springs in series was derived. Finally, the influence of inflation pressure was also examined. Results demonstrated appreciable differences in tire performance between 29 × 2.3”, 27.5 × 2.8”, 29 × 3”, and 26 × 4” knobby tires. The proposed simple model to combine tread knob and carcass stiffness offered a good approximation, whereas inflation pressure had a strong effect on mountain bike tire behavior.

scholarly journals Vibration Analysis of a Tire in Ground Contact under Varied Conditions

2017 ◽  
Vol 47 (1) ◽  
pp. 3-17 ◽  
Author(s):  
Murat Karakus ◽  
Aydin Cavus ◽  
Mehmet Colakoglu
Keyword(s):  
Free Vibration ◽  
Natural Frequencies ◽  
Three Dimensional ◽  
Concrete Block ◽  
Ground Contact ◽  
Tire Model ◽  
Inflation Pressure ◽  
Monitoring Method ◽  
The Impact ◽  
Good Agreement

Abstract The effect of three different factors, which are inflation pressure, vertical load and coefficient of friction on the natural frequencies of a tire (175/70 R13) has been studied. A three dimensional tire model is constructed, using four different material properties and parts in the tire. Mechanical properties of the composite parts are evaluated. After investigating the free vibration, contact analysis is carried out. A concrete block and the tire are modelled together, using three different coefficients of friction. Experiments are run under certain conditions to check the accuracy of the numerical model. The natural frequencies are measured to describe free vibration and vibration of the tire contacted by ground, using a damping monitoring method. It is seen, that experimental and numerical results are in good agreement. On the other hand, investigating the impact of three different factors together is quite difficult on the natural frequencies. When some of these factors are assumed to be constant and the variables are taken one by one, it is easier to assess the effects.

Analysis on the Hydroplaning of Aircraft Tire

2009 ◽  
Vol 87-88 ◽  
pp. 1-6 ◽  
Author(s):  
You Shan Wang ◽  
Jian Wu ◽  
Ben Long Su
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
Tire Model ◽  
Inflation Pressure ◽  
Civil Aircraft ◽  
Key Factor ◽  
Lagrangian Finite Element ◽  
Patterned Tire ◽  
Volume Method

Aircraft tire is an important subassembly of aircraft, which is related to its safety tightly, especially for civil aircraft. Moreover, hydroplaning of aircraft tires is often a contributing factor in take-off and landing overrun and veeroff accidents. Therefore the study on them is imperative. For studying the hydroplaning of aircraft tire, a 2D finite element model of aircraft tire is developed by using TYABAS software, and then a 3D patterned tire model is presented. The hydroplaning of aircraft tire is analyzed by generally coupling an Eulerian finite volume method and an explicit Lagrangian finite element method. The hydroplaning speeds are investigated, which is a key factor of hydroplaning. Results indicated that the hydroplaning speed increases with the increment of inflation pressure; the hydroplaning speed decreases with the increment of the footprint aspect ratio.

The in vitro Study of Pressure Change Effect on Corneal Birefringence

2010 ◽  
Vol 43 (3) ◽  
pp. 159-168 ◽  
Author(s):  
Zhen Xiao ◽  
Chong Wang ◽  
Yan-sheng Hao
Keyword(s):  
In Vitro Study ◽  
Pressure Change ◽  
Vitro Study ◽  
Change Effect

scholarly journals An Improved Optimal Slip Ratio Prediction considering Tyre Inflation Pressure Changes

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Guoxing Li ◽  
Tie Wang ◽  
Ruiliang Zhang ◽  
Fengshou Gu ◽  
Jinxian Shen
Keyword(s):  
Pressure Change ◽  
Inflation Pressure ◽  
Slip Ratio ◽  
Braking Performance ◽  
Tyre Pressure ◽  
Software Packages ◽  
Optimal Slip Ratio ◽  
Nominal Pressure ◽  
The Difference ◽  
Pressure Changes

The prediction of optimal slip ratio is crucial to vehicle control systems. Many studies have verified there is a definitive impact of tyre pressure change on the optimal slip ratio. However, the existing method of optimal slip ratio prediction has not taken into account the influence of tyre pressure changes. By introducing a second-order factor, an improved optimal slip ratio prediction considering tyre inflation pressure is proposed in this paper. In order to verify and evaluate the performance of the improved prediction, a cosimulation platform is developed by using MATLAB/Simulink and CarSim software packages, achieving a comprehensive simulation study of vehicle braking performance cooperated with an ABS controller. The simulation results show that the braking distances and braking time under different tyre pressures and initial braking speeds are effectively shortened with the improved prediction of optimal slip ratio. When the tyre pressure is slightly lower than the nominal pressure, the difference of braking performances between original optimal slip ratio and improved optimal slip ratio is the most obvious.

scholarly journals Development of the Flexible Ring on an Elastic Continuous Foundation Tire Model for Planar Vibration of the Heavy Load Radial Tire

2018 ◽  
Vol 8 (11) ◽  
pp. 2064
Author(s):  
Zhihao Liu ◽  
Qinhe Gao ◽  
Hailong Niu
Keyword(s):  
Structural Parameters ◽  
Kinematic Characteristic ◽  
Vibration Characteristic ◽  
Tire Model ◽  
Inflation Pressure ◽  
Heavy Load ◽  
Coupling Vibration ◽  
Radial Tire ◽  
Planar Vibration ◽  
Flexible Ring

This paper investigates the planar vibration characteristic of heavy load radial tires with a large flat ratio. A proposed tire model with a flexible ring on an elastic continuous foundation is investigated utilizing kinematic modeling and experimental modal analysis. Planar coupling deformation of the radial and tangential direction is considered to enrich the kinematic characteristic of the flexible belt and the continuous sidewall; a flexible ring on an elastic continuous foundation tire model is proposed to investigate the coupling vibration characteristic between the flexible belt and the continuous sidewall. In-extensibility assumption is utilized to simplify the proposed tire model and the planar vibration modal features of the heavy load radial tire are discussed. The variation of the inflation pressure on the radial and tangential stiffness of the sidewall spring model is enriched into the flexible ring on an elastic continuous foundation tire model to extend the modal prediction of the tires with a different inflation pressure. Taking the relative error between the experimental and analytical modal resonance frequency of the tested tire with a different inflation pressure as the object value, structural parameters of the proposed tire model are identified by a backward genetic algorithm. Experimental and theoretical results show that: the planar coupling vibration characteristic of the heavy load radial tire can be predicted precisely with the flexible ring on an elastic continuous foundation tire model; meanwhile, considering the linear variations of the radial and tangential sidewall stiffness due to the inflation pressure, the proposed tire model can be extended to analyze the vibration characteristic of the heavy load radial tire with a different inflation pressure.

Effects of Variations in Geometry and Material on the Non-uniformity of Tires

2001 ◽  
Vol 29 (1) ◽  
pp. 56-64 ◽  
Author(s):  
Y. Meijuan ◽  
D. Yuankan ◽  
R. Gall ◽  
N. D. Rodriguez
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Radial Force ◽  
Numerical Results ◽  
Radial Load ◽  
Tire Model ◽  
Inflation Pressure ◽  
Element Analysis ◽  
Product Thickness

Abstract Finite element analysis is used to predict radial force variations caused by geometry and material imperfections in the tire. Imperfections, such as a change in tread compound modulus or an increase in product thickness, are applied in a 180° section of the tire model. The radial load variation for a given deflection is then computed. Experimental studies are carried out to confirm the numerical results. Further studies investigate the influence of the inflation pressure and address the application of results to other tire designs.

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