11th Edition

Dynamics in Engineering Practice

By Dara W. Childs, Andrew P. Conkey Copyright 2015
    474 Pages 706 B/W Illustrations
    by CRC Press

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    Observing that most books on engineering dynamics left students lacking and failing to grasp the general nature of dynamics in engineering practice, the authors of Dynamics in Engineering Practice, Eleventh Edition focused their efforts on remedying the problem. This text shows readers how to develop and analyze models to predict motion. While establishing dynamics as an evolution of continuous motion, it offers a brief history of dynamics, discusses the SI and US customary unit systems, and combines topics that are typically covered in an introductory and intermediate, or possibly even an advanced dynamics course. It also contains plenty of computer example problems and enough tools to enable readers to fully grasp the subject. A free support book with worked computer examples using MATLAB® is available upon request.

    New in the Eleventh Edition:

    A large number of problems have been added; specifically, 59 new problems have been included in the original problem sets provided in chapters two through five. Chapter six has been added and covers the application of Lagrange’s equations for deriving equations of motion.

    The new and improved chapters in this text:

    • Address the fundamental requirements of dynamics, including units, force, and mass, and provides a brief history of the development of dynamics
    • Explore the kinematics of a particle, including displacement, velocity, and acceleration in one and two dimensions
    • Cover planar kinetics of rigid bodies, starting with inertia properties and including the mass moment of inertia, the radius of gyration, and the parallel-axis formula
    • Explain how to develop equations of motion for dynamics using Lagrange’s equations

    Dynamics in Engineering Practice, Eleventh Edition shows readers how to develop general kinematic equations and EOMs, analyze systems, and set up and solve equations, using a revolutionary approach to modeling and analysis along with current computer techniques.

    Introduction and Fundamentals
    Short History of Dynamics
    Planar Kinematics of Particles
    Motion in a Straight Line
    Particle Motion in a Plane: Cartesian Coordinates
    Coordinate Transformations: Relationships between Components of a Vector in Two-Coordinate Systems
    Particle Motion in a Plane: Polar Coordinates
    Particle Motion in a Plane: Normal-Tangential (Path) Coordinates
    Moving between Cartesian, Polar-, and Path-Coordinate Definitions for Velocity and Acceleration Components
    Time-Derivative Relationships in Two-Coordinate Systems
    Velocity and Acceleration Relationships in Two Cartesian Coordinate Systems
    Relative Position, Velocity, and Acceleration Vectors between Two Points in the Same Coordinate System
    Summary and Discussion
    Planar Kinetics of Particles
    Differential Equations of Motion for a Particle Moving in a Straight Line: An Introduction to Physical Modeling
    More Motion in a Straight Line: Degrees of Freedom and Equations of Kinematic Constraints
    Motion in a Plane: Equations of Motion and Forces of Constraint
    Particle Kinetics Examples with More than 1DOF
    Work-Energy Applications for 1DOF Problems in Plane Motion
    Linear-Momentum Applications in Plane Motion
    Moment of Momentum
    Summary and Discussion
    Planar Kinematics of Rigid Bodies
    Rotation about a Fixed Axis
    Velocity and Acceleration Relationships for Two Points in a Rigid Body
    Rolling without Slipping
    Planar Mechanisms
    Summary and Discussion
    Planar Kinetics of Rigid Bodies
    Inertia Properties and the Parallel-Axis Formula
    Governing Force and Moment Equations for a Rigid Body
    Kinetic Energy for Planar Motion of a Rigid Body
    Fixed-Axis-Rotation Applications of the Force, Moment, and Energy Equations
    Compound Pendulum Applications
    General Applications of Force, Moment, and Energy Equations for Planar Motion of a Rigid Body
    Moment of Momentum for Planar Motion
    Summary and Discussion
    Lagrange’s Equations of Motion
    Deriving Lagrange’s Equations of Motion
    Applying Lagrange’s Equation of Motion to Problems without Kinematic Constraints
    Conservation of Momenta from Lagrange’s Equations of Motion
    Application of Lagrange’s Equations to Examples with Algebraic Kinematic Constraints
    Using Lagrange Multipliers to Define Reaction Forces for Systems with Generalized Coordinates
    Summary and Discussion
    A: Essentials of Matrix Algebra
    B: Essentials of Differential Equations
    Mass Properties of Common Solid Bodies
    Answers to Selected Problems


    Dr. Dara Childs is professor of mechanical engineering at Texas A&M University (TAMU) in College Station, Texas. He has been director of the TAMU Turbomachinery Laboratory since 1984. He has received several best-paper awards, is an American Society of Mechanical Engineers (ASME) life fellow, and received the ASME Henry R. Worthington medal for outstanding contributions in pumping machinery. He is the author of many conference and journal papers plus two prior books. Dr. Childs has taught graduate and undergraduate courses in dynamics and vibrations since 1968: Colorado State University (1968–1971), University of Louisville (1971–1980), TAMU (1980–present).

    Andrew P. Conkey received his PhD from Texas A&M University (TAMU) in 2007, where his research was in the application of the fiber Fabry–Perot interferometer to machinery/vibration measurements. He received his bachelor’s and master’s degrees from TAMU–Kingsville. He has over 16 years of teaching experience, having taught at TAMU–Kingsville, TAMU–College Station, TAMU–Qatar, and TAMU–Corpus Christi. In addition to teaching, he has worked for a refinery, a fiber-optic sensor company, and an engineering consulting firm.

    "It is easy to identify students who learned dynamics from (previous editions) of this book…. They are confident, they approach new problems based on fundamental principles, they are not afraid of dynamics. The integrated, differential equations & fundamental principles based approach removes the dread from dynamics! No longer is there fear an uncertainty of picking the correct equation & guessing the correct special case… every problem can be methodically approached from the same few principles and conquered."
    —James R Morgan, Charles Sturt University, Bathurst, NSW, Australia