Book description
MECHANICAL VIBRATIONS by J. P. DEN HARTOG. Originally published in
1917. PREFACE: This book grew from a course of lectures given to
students in the Design School of the Westinghouse Company in Pittsburgh,
Pa., in the period from 1926 to 1932, when the subject had not yet been
introduced into the curriculum of our technical schools. From 1932 until
the beginning of the war, it became a regular course at the Harvard
Engineering School, and the book was written for the purpose of
facilitating that course, being first published in 1934. In its first
edition, it was influenced entirely by the authors industrial experience
at Westinghouse the later editions have brought modifications and
additions suggested by actual problems published in the literature, by
private consulting practice, and by service during the war in the Bureau
of Ships of the U. S. Navy. The book aims to be as simple as is
compatible with a reason ably complete treatment of the subject.
Mathematics has not been avoided, but in all cases the mathematical
approach used is the simplest one available. In the third edition the
number of problems has again been increased, while the principal changes
in the text concern subjects in which recent advances have been made,
such as airplane wing flutter, helicopter ground vibration, torsional
pendulum dampers, singing ships propellers, and electronic instruments.
The author expresses his gratitude to the many readers who have written
him calling attention to errors and making sugges tions for improvements
and hopes that readers of this third edition will also offer
suggestions. J P. DEN HAIITOG. CAMBRIDGE, MASS., January, 1947. Contents
include: PREFACE. . . LIST OF SYMBOLS CHAPTER I KINEMATICS OF VIBRATION
1. Definitions . 2. The Vector Method of Representing Vibrations 3.
Beats 4. A Case of Hydraulic-turbine Penstock Vibration tS 5.
Representation by Complex Numbers 11 6. Work Done on Harmonic Motions. .
. . . . 14 7. Non-harmonic Periodic Motions. . . . . . 19 CHAPTER II THE
SINGLE DEGREE OF FREEDOM SYSTEM 8. Degrees of Freedom 34 9. Derivation
of the Differential Equation , 36 10. Other Cases 38 11. Free Vibrations
without Damping 43 12. Examples 47 13. Free Vibrations with Viscous
Damping . ... 51 14. Forced Vibrations without Damping ... .57 15.
Forced Vibrations with Viscous Damping. .... 63 16. Frequency Measuring
Instruments. ... ... 72 17. Seismic Instruments .75 18. Electrical
Measuring Instruments ... . SO 19. Theory of Vibration Isolation ....
... S9 20. Application to Single-phase Electrical Machinery 92 21.
Application to Automobiles Floating Power 96 CHAPTER III Two DEGREES OF
FREEDOM 22. Free Vibrations Natural Modes 103 23. The Undamped Dynamic
Vibration Absorber 112 24. The Damped Vibration Absorber .119 viii
CONTENTS 25. Ship Stabilization by Means of Frahms Tanks 133 26.
Gyroscopic Ship Stabilizers 139 26a. Activated Ship Stabilizers 142 27.
Automobile Shock Absorbers 145 CHAPTER IV MANY DEGREES OF FREEDOM 28.
Free Vibrations without Damping 155 29. Forced Vibrations without
Damping 160 30. Free and Forced Vibration with Damping 165 31. Strings
and Organ Pipes Longitudinal and Torsional Vibra tions of Uniform Bars
170 32. Rayleighs Method 178 33. Bending Vibrations of Uniform Beams 185
34. Beams of Variable Cross Section 194 35. Normal Functions and Their
Applications 198 35a. Stodolas Method for Higher Modes 202 36. Rings,
Membranes, and Plates 205 CHAPTER V MULTICYLINDER ENGINES 37. Troubles
Peculiar to Reciprocating Engines 213 38. Dynamics of the Crank
Mechanism 217 39...
