1st Edition

Dynamics of Wheel-Soil Systems A Soil Stress and Deformation-Based Approach

By Jaroslaw A. Pytka Copyright 2013
    331 Pages 174 B/W Illustrations
    by CRC Press

    Why is knowledge of soil stress and deformation state important for off-road locomotion? How do you measure soil stress and deformation under wheel loads? What are the actual values of stresses and deformation in soil or snow under a passing wheel? Providing answers to these questions and more, Dynamics of Wheel–Soil Systems: A Soil Stress and Deformation-Based Approach is a practical reference for anyone who works with experiment design and data analysis of soil stress and deformation measurements under vehicle load.

    Based on the author’s 15 years of experience in field experimentation on wheel–soil dynamics, the book describes methods and devices for soil stress and deformation measurements and presents numerical data from full-scale field experiments. These methods offer practical solutions to methodological problems that may arise during the design and preparation of field experiments.

    • Provides technical information on measuring, modeling, and optimizing off-road vehicle traction—including a novel method for describing off-road traction
    • Provides rare experimental data on soil stress and deformation under a variety of wheeled and tracked vehicles
    • Supplies solutions for designing, building, and using soil or snow pressure transducers and sensors
    • Compiles original experimental data on soil degradation due to agricultural machinery traffic and soil compaction
    • Explains how to create dynamic models of wheel–soil systems based on experimental data

    A valuable reference on an important area of terramechanics, this book shows how to analyze and model wheel–soil interactions to create more effective designs for a range of vehicle types.

    Introduction to Wheel–Soil Systems
    Ground Vehicles and Their Running Gears
    Major Research Problems
    References

    Measurement of Soil Stress and Deformation
    Soil Stress Measurements: Introduction
    Characterisation of Soil Stress Transducers
    Strain Gage Pressure Transducers for Soils
    Stress State Transducer (SST)
    Soil Deformation Determination
    Conclusions
    References

    Soil Stress and Deformation State: Investigations in Monolith Soil Samples
    Introduction
    Effect of Static Load and Soil Stress and Deformation in Loamy Luvisol
    Effects Deformation Rate on Soil Stress and Deformation State in Loess
    References

    Stress State under Wheeled Vehicle Loads
    Introduction
    Field Experiment Preparation
    Analysis of Principal Stresses
    Effect of Vehicle Loading and Reduced Inflation Pressure
    Effects of Repeated Rolling
    Analysis of Octahedral Stresses
    Relationships of Soil Stress and Drawbar Pull
    Final Discussion and Concluding Remarks
    References

    Stress State under Tracked Vehicle Loads
    Introduction
    Experimental Methods
    Analysis of Soil Stress State under Loading by Tracked Vehicles
    Determination of Soil Stress–Strain Relationships
    Effects of Rubber Pads on Soil Stress and Tracked Vehicle Traction
    Final Conclusions
    References

    Wheel–Soil Dynamics for Aircraft Tyres on Unsurfaced Airfields
    Introduction
    Soil Stress State under Loading of Landing Aircraft
    Rolling Resistance Coefficients for Aircraft Tyres on Unsurfaced Airfields
    Effect of Grassy Surface on Take-Off Distance
    Proposed Method for Airfield Surface Evaluation and Classification
    Summary
    References

    Snow Stress State under Ground Vehicle Loads
    Introduction
    Snow Stress Measurement Methods
    Determining Snow Stress under Loading of Grooming Machine
    Determination of Winter Traction and Snow Stresses under Military Truck Loading
    Effects of Snow Skis on Snow Stresses and Aircraft Ground Performance
    Summary
    References

    Modelling of Wheel–Soil System Based on Soil Stress and Deformation State Analysis
    Introduction
    Modelling Off-Road Traction
    Modelling Soil Stress State by System Identification (SI)
    Modelling Dynamic Effects of Wheel–Soil System
    Summary
    References

    Summary

    Index

    Biography

    Jaroslaw Alexander Pytka is a research engineer and instructor of undergraduate and graduate students of automotive technology at the Lublin University of Technology, Poland. Dr. Pytka earned an MS in automotive technology from the Lublin University of Technology in 1992, and a Ph.D. in soil physics from the Institute of Agrophysics in Lublin. His major research interest is wheel–soil interaction analysis with a focus on experimental studies. Dr. Pytka has authored or coauthored more than 50 papers and is a reviewer for the Journal of Terramechanics.