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Author: Mehrsa Marjani Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Tires are considered one of the most important components of ground vehicles as they are the only link between the chassis and ground. They support the vehicle weight and cushion road surface irregularities to provide a comfortable ride. Tires are designed in a way that provide necessary tractive, braking, and cornering forces to form a safe and stable ride for ground vehicles. Recent advancements in computerized and virtual modeling provided an efficient methodology for accurate prediction of tire characteristics. In this thesis Finite Element Analysis (FEA) is employed as a method to accurately construct a new virtual wide-base tire model, validate it, and then study rolling resistance of the tire on a hard surface. This thesis includes tire-soil interaction and effects of soil on tires rolling resistance. To accurately study rolling resistance on soft soil, various soil models are created by using FEA and Smoothed Particle Hydrodynamics (SPH), as a representative of dry sand soil. Soil models are calibrated by using shear-displacement and pressure-sinkage simulation tests. The simulation results are then compared to published data. Also, the created soil models are compared to each other to determine the optimum one based on computational time efficiency and accuracy. SPH, as the accurate current method for soil modeling, has long computational solving time. In this thesis FEA/SPH hybrid soil models are studied and modified to achieve lower computational solving time while having the desirable accuracy. Rolling resistance of tire on each soil model is carried out through various loads and inflation pressures and the simulation results are compared to physical test results to examine the accuracy of each soil model. The new hybrid soil model created in this thesis reduces the computational CPU time almost by half and slightly increases accuracy compared to full SPH soil model.
Author: Mehrsa Marjani Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Tires are considered one of the most important components of ground vehicles as they are the only link between the chassis and ground. They support the vehicle weight and cushion road surface irregularities to provide a comfortable ride. Tires are designed in a way that provide necessary tractive, braking, and cornering forces to form a safe and stable ride for ground vehicles. Recent advancements in computerized and virtual modeling provided an efficient methodology for accurate prediction of tire characteristics. In this thesis Finite Element Analysis (FEA) is employed as a method to accurately construct a new virtual wide-base tire model, validate it, and then study rolling resistance of the tire on a hard surface. This thesis includes tire-soil interaction and effects of soil on tires rolling resistance. To accurately study rolling resistance on soft soil, various soil models are created by using FEA and Smoothed Particle Hydrodynamics (SPH), as a representative of dry sand soil. Soil models are calibrated by using shear-displacement and pressure-sinkage simulation tests. The simulation results are then compared to published data. Also, the created soil models are compared to each other to determine the optimum one based on computational time efficiency and accuracy. SPH, as the accurate current method for soil modeling, has long computational solving time. In this thesis FEA/SPH hybrid soil models are studied and modified to achieve lower computational solving time while having the desirable accuracy. Rolling resistance of tire on each soil model is carried out through various loads and inflation pressures and the simulation results are compared to physical test results to examine the accuracy of each soil model. The new hybrid soil model created in this thesis reduces the computational CPU time almost by half and slightly increases accuracy compared to full SPH soil model.
Author: Moustafa El-Gindy Publisher: Springer Nature ISBN: 3031362160 Category : Technology & Engineering Languages : en Pages : 469
Book Description
This book introduces and provides a detailed understanding of on- and off-road vehicle dynamics. It discusses classical on-road tyre mechanics, including finite element tyre modelling and validation, using a combination of theoretical and experimental data sets. Chapters explore new computational techniques that describe terrain models and combined to develop better off-road vehicle models, and focus is placed on terrain characterization and modelling, using two popular modelling techniques, as well as performance characteristics of off-road vehicles - including rolling and driven combinations, traction, and steering. The effect of multi-pass and soil compaction on tyre performance is described as well. The book presents a unique neuro-tyre model for both on-road and off-road situations, capable of computing the steering, braking characteristics, and soil compaction. Road vehicle characteristics are described, including the stability and control, roll centre and roll axis, and rollover mechanics. The road vehicle braking performance is also described, including the brake components, choice of brake, and the transient load transfer. Finally, the dynamics and control of multi-wheel combat vehicles are presented and described extensively. The book is dedicated to undergraduate and graduate engineering students, in addition to researchers, and the automotive industry. As well as provide the readers with a better understanding of vehicle dynamics and soil mechanics. The book is also beneficial for automotive industries looking for a quick and reliable model to be implemented in their main software.
Author: Zeinab El-Sayegh Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
One of the key factors for improving the mobility and operating efficiency of trucks is the understanding of the tire-terrain interaction characteristics. Due to the broad range of terrains that trucks may operate over, the understanding process of the tire-terrain interaction is necessary. The terrains for on-road operations are commonly dry or wet surfaces. For off-road operations, a more extensive range of deformable terrains exists, such as dense sand, clayey soil, and gravel. In some cases, vehicles may operate over terrains covered with snow or layers of mixed snow and ice. This research work focuses on modeling and investigating the tire-terrain interaction on several terrains to better predict off-road truck performance. The truck tire used in this research is the off-road Regional Haul Drive (RHD) size 315/80R22.5 drive tire. The truck tire is built node-by-node using Finite Element Analysis (FEA) technique and is validated using different dynamic and static tests that are compared to the manufacturer's measured data. The terrains are modeled and calibrated using the Smoothed-Particle Hydrodynamics (SPH) instead of the classical FEA technique. Furthermore, two soil moisturizing techniques are presented to model moist soils, the virtually calibrated moist sand is validated against physical measurements. The in-plane and out-of-plane rigid ring tire model parameters are calculated for the off-road tire running on various terrains. The tire-terrain interaction is performed under several operating conditions and the effect of the operating conditions are investigated. Furthermore, a detailed study of the rolling resistance coefficient prediction over different terrains is presented. In this research work, the hydroplaning phenomenon is investigated. The hydroplaning speed of the tire is computed under different operating conditions. A novel equation to predict the truck tire hydroplaning speed as a function of several tire operational parameters is developed and validated against an empirical equation. In addition, the rigid ring tire model is integrated into a highly advanced full vehicle model to predict the truck on-road and off-road performance. Nonetheless, in order to validate the simulation results of the truck tire-terrain interaction obtained in this thesis physical testing was carried out in Gothenburg, Sweden by Volvo Groups Truck Technology.
Author: Publisher: ISBN: Category : Languages : en Pages : 10
Book Description
This research program is aimed at the development of a soil-tire interaction model based on Contact Mechanics Theory. The model developed obviates the need for a priori knowledge of soil-tire contact properties and instead relies on directly and accurately measurable quantities. Other major research outcomes of this program include: 1) the first complete solution to the frictional contact problem between a granular material and a deformable solid, 2) extension of the Double Shearing theory for dilatant granular flow to three dimensions and 3) the development of a new technique for the micro-mechanical analysis of granular media.
Author: Kristian Lee Lardner Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Significant time and cost savings can be realized through the use of virtual simulation of testing procedures across diverse areas of research and development. Fully detailed virtual truck models using the simplified off-road rigid-ring model parameters may further increase these economical savings within the automotive industry. The determination of the off-road rigid-ring parameters is meant to facilitate the simulation of full vehicle models developed by Volvo Group Trucks Technology. This works features new FEA (Finite Element Analysis) tire and SPH (Smoothed Particle Hydrodynamics) soil interaction modeling techniques. The in-plane and out-of-plane off-road rigid-ring parameters are predicted for an RHD (Regional Haul Drive) truck tire at varying operating conditions. The tire model is validated through static and dynamic virtual tests that are compared to previously published literature. Both the in-plane and out-of-plane off-road rigid-ring RHD parameters were successfully predicted. The majority of the in-plane parameters are strongly influenced by the inflation pressure of the tire because the in-plane parameters are derived with respect to the mode of vibration of the tire. The total equivalent vertical stiffness on a dry sand is not as heavily influenced by the inflation pressure compared to predictions on a hard surface. For perspective, at 110 psi, the dry sand total vertical stiffness is nearly nine times smaller than that determined on the hard surface, while the lateral stiffness on soft soil (Dry Sand) is at a minimal of three times higher than that of the corresponding values tested on a hard surface. The cornering stiffness is primarily load dependant because the inflation pressure is only noticeably influential at high vertical loads. More importantly, the soil builds in front of the tire, creating what is called a bulldozing effect, during high slip angles. The additional lateral force of the soil exerted onto the tire during cornering maneuvers may contribute to higher than expected results and may be confirmed through future investigation of the cohesion of the soil model.
Author: Ahmad Mohsenimanesh Publisher: LAP Lambert Academic Publishing ISBN: 9783843375535 Category : Agricultural machinery Languages : en Pages : 120
Book Description
Predicting tyre-soil interface pressures distributions that are based on experimental findings is a significant aspect of soil compaction. Applied Tyre-Soil Mechanics with ANSYS@ Application provide transportation, mechanical and agricultural engineering student and practitioner with processes to applying the finite element method to tyre-soil interaction. This book explains how to accurately measure the in-situ pressure patterns on the tyre-soil interface under dynamic wheel mode on a soft soil. It also describes the developing of a Finite Element model of a modern tractor tyre including the cord angles in each layer, the thickness of the individual rubber layers and nearly incompressible property of the tread rubber block on a rigid surface and multi- layered soft soil by considering the variability of the soil material. Topics covered include: Wireless data acquisition system Field test tyre-soil interface pressures 3D tyre footprint Tyre and soil material properties ANSYS Finite element software Soil compaction"
Author: Mehrsa Marjani
Author: Mehrsa Marjani
Author: Moustafa El-Gindy
Author: Ranvir Singh Dhillon
Author: Adam Cameron Reid
Author: Zeinab El-Sayegh
Author: 
Author: Kristian Lee Lardner
Author: Adnan Degirmencioglu
Author: Ryan Lescoe
Author: Ahmad Mohsenimanesh