Rigid Body Dynamics of Mechanisms: 1 Theoretical Basis

ISBN-13: 9783642076176 / Angielski / Miękka / 2010 / 336 str.

Hubert Hahn

Opis

The dynamics of mechanical rigid-body mechanisms is a highly developed discipline. The model equations that apply to the tremendous variety of ap plications of rigid-body systems in industrial practice are based on just a few basic laws of, for example, Newton, Euler, or Lagrange. These basic laws can be written in an extremely compact, symmetrical, and esthetic form, simple enough to be easily learned and kept in mind by students and engi neers, not only from the area of mechanics but also from other disciplines such as physics, or mathematics, or even control, hydraulics, or electronics. This latter aspect is of immense practical importance since mechanisms, ma chines, robots, and vehicles in modern industrial practice (sometimes called mechatronic systems) usually include various subsystems from the areas of hydraulics, electronics, pneumatics, informatics, and control, and are built by engineers trained in quite different disciplines. Conventional methods of modeling rigid-body mechanisms In contrast to the comparatively simple and easy-to-learn basic laws of rigid body systems, the practical application of these laws to the planar or spatial motions of industrial mechanisms rapidly leads to extremely lengthy and complex equations of motion, where the form and complexity of the model equations depends critically on the choice of the model coordinates. Until recently this had the following consequences: 1. A large variety of specialized techniques have been developed, each suit able for efficiently modeling a special-purpose mechanism."

Recenzje

From the reviews:

"The present book is a very important and useful introduction of mechanical aspects of mechatronic systems. This book is very useful for undergraduate students of mechanical engineering, control engineering, civil engineering, electrical engineering, mathematics and physics. This book is also very useful for practicing engineers since with this book they have the opportunity of a systematic choice of notation, of an algebraic formulation of all the expressions, of a possibility of direct implementation in a computer and finally of an application ... ." (T. E. Simos, Journal of Computational Methods in Sciences and Engineering, Vol. 3 (1), 2003)

"This monograph presents an introduction into basic mechanical aspects of mechatronic systems for students, researchers and engineers from industrial practice. An overview over the theoretical background of rigid body mechanics is given as well as a systematic approach for deriving model equations of general rigid body mechanisms in the form of differential-algebraic equations (DAE). Objective of this book is to prepare the reader for being capable of efficiently handling and applying general purpose rigid body programs to complex mechanics ... ." (European Journal of Mechanical and Environmental Engineering, Vol. 47 (2), 2002)

Spis treści

1. Introduction.- 2. Planar and spatial vectors, matrices, and vector functions.- 3. Constraint equations and constraint reaction forces of mechanisms.- 4. Dynamics of planar and spatial rigid-body systems.- 5. Model equations of planar and spatial joints.- 6. Constitutive relations of planar and spatial external forces and torques.- A. Appendix.- A.1 Special vector and matrix operations used in mechanics.- A.1.1 Euclidean vector space.- A.1.2 Scalar product and cross product of planar vectors.- A.1.3 Cross product of spatial vectors.- A.1.4 Time derivatives of planar orientation matrices and of planar vectors in different frames.- A.1.5 Time derivatives of spatial orientation matrices and of spatial vectors in different frames.- A.1.6 Derivatives of vector functions.- A.2.1 Kinetic energy of an unconstrained rigid body.- A.2.3 Spatial equations of motion of a constrained rigid body.- A.4 Constraint equations of a general universal joint.- A.4.1 Notation and abbreviations.- A.4.2 Computation of constraint equations.- A.4.2.1 First constraint equation.- A.4.2.2 Second constraint equation.- A.4.2.3 Third constraint equation.- A.4.2.4 Fourth constraint equation.- A.4.3 Computation of the shortest distance between two rotation axes.- References.- List of figures.

Blurb

This monograph presents an introduction into basic mechanical aspects of mechatronic systems for students, researchers and engineers from industrial practice. An overview over the theoretical background of rigid body mechanics is given as well as a systematic approach for deriving and solving model equations of general rigid body mechanisms in the form of differential-algebraic equations (DAE). Objective of this book is to prepare the reader for being capable of efficiently handling and applying general purpose rigid body programs to complex mechanisms. The reader will be able to set up symbolic mathematical models of planar and spatial mechanisms in DAE-form for computer simulations, often required in dynamic analysis and in control design.