| |
| |
| |
Introduction | |
| |
| |
| |
Why Another Book about Mechanical Vibrations? | |
| |
| |
| |
A Short Overview of Theory | |
| |
| |
| |
Single Degree of Freedom (sdof) Systems | |
| |
| |
| |
Damped Vibrations | |
| |
| |
| |
Multi-Degrees of Freedom (mdof) Dynamic Systems | |
| |
| |
| |
Modal Analysis | |
| |
| |
| |
Modal Effective Mass | |
| |
| |
| |
Response Analysis | |
| |
| |
| |
Transient Response Analysis | |
| |
| |
| |
Random Vibrations | |
| |
| |
| |
Shock-Response Spectrum | |
| |
| |
| |
Acoustic Loads, Structural Responses | |
| |
| |
| |
Statistical Energy Analy sis | |
| |
| |
| |
Inertia-Relief | |
| |
| |
| |
Mode Acceleration Method | |
| |
| |
| |
Residual Vectors | |
| |
| |
| |
Dynamic Model Reduction | |
| |
| |
| |
Component Model Synthesis | |
| |
| |
| |
Load Transformation Matrices | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Single Degree of Freedom System | |
| |
| |
| |
Introduction | |
| |
| |
| |
Undamped Sdof System | |
| |
| |
| |
Solution of an Sdof System with Initial Conditions | |
| |
| |
| |
Solution of an Sdof System with Applied Forces | |
| |
| |
| |
Damped Vibration and the Damping Ratio | |
| |
| |
| |
Solution of the Sdof System in the Time Domain | |
| |
| |
| |
Solution of the Damped Sdof System with Applied Forces | |
| |
| |
| |
Solution in the Frequency Domain | |
| |
| |
| |
State Space Representation of the Sdof System | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Problem 4 | |
| |
| |
| |
Problem 5 | |
| |
| |
| |
Problem 6 | |
| |
| |
| |
Problem 7 | |
| |
| |
| |
Problem 8 | |
| |
| |
| |
Damping Models | |
| |
| |
| |
Introduction | |
| |
| |
| |
Damped Vibration50 | |
| |
| |
| |
Linear Damping | |
| |
| |
| |
Viscous Damping | |
| |
| |
| |
Structural Damping | |
| |
| |
| |
Loss Factor | |
| |
| |
| |
Amplification Factor | |
| |
| |
| |
Modal Viscous Damping | |
| |
| |
| |
Modal Structural Damping | |
| |
| |
| |
Discussion of Modal Damping | |
| |
| |
| |
Method of Determining Damping from Measurements | |
| |
| |
| |
The Half-Power Point Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Multi-Degrees of Freedom Linear Dynamic Systems | |
| |
| |
| |
Introduction | |
| |
| |
| |
Derivation of the Equations of Motion | |
| |
| |
| |
Undamped Equations of Motion with Newton's Law | |
| |
| |
| |
Undamped Equations of Motion using Energies | |
| |
| |
| |
Undamped Equations of Motion using Lagrange's Equations | |
| |
| |
| |
Damped Equations of Motion using Lagrange's Equations | |
| |
| |
| |
Finite Element Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Modal Analysis | |
| |
| |
| |
Introduction | |
| |
| |
| |
Undamped Linear Dynamic Systems | |
| |
| |
| |
Natural Frequencies and Mode Shapes | |
| |
| |
| |
Orthogonality Relations of Modes | |
| |
| |
| |
Rigid-Body Modes | |
| |
| |
| |
Left Eigenvectors | |
| |
| |
| |
Damped Linear Dynamic Systems | |
| |
| |
| |
The State Vector | |
| |
| |
| |
Eigenvalue Problem | |
| |
| |
| |
Eigenvectors | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Natural Frequencies, an Approximation | |
| |
| |
| |
Introduction | |
| |
| |
| |
Static Displacement Method | |
| |
| |
| |
Ray leigh's Quotient | |
| |
| |
| |
Dunkerley's Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Problem 4 | |
| |
| |
| |
Problem 5 | |
| |
| |
| |
Modal Effective Mass | |
| |
| |
| |
Introduction | |
| |
| |
| |
Enforced Acceleration | |
| |
| |
| |
Modal Effective Masses of an Mdof System | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Response Analysis | |
| |
| |
| |
Introduction | |
| |
| |
| |
Forces and Enforced Acceleration | |
| |
| |
| |
Relative Motions | |
| |
| |
| |
Absolute Motions | |
| |
| |
| |
Large-Mass Approach | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Transient-Response Analysis | |
| |
| |
| |
Introduction | |
| |
| |
| |
Numerical Time Integration | |
| |
| |
| |
Discrete Solution Convolution Integral | |
| |
| |
| |
Explicit Time-Integration MethopP155 | |
| |
| |
| |
Implicit Time-Integration Methods | |
| |
| |
| |
Stability | |
| |
| |
| |
Explicit Time-Integration | |
| |
| |
| |
Central Difference Method | |
| |
| |
| |
Runge-Kutta Formulae for First-Order Differential Equations | |
| |
| |
| |
Runge-Kutta-Nystrom Method for S-O Differential Equations | |
| |
| |
| |
Implicit Time Integration | |
| |
| |
| |
Houbolt Method | |
| |
| |
| |
Wilson theta Method | |
| |
| |
| |
Newmark-beta Method | |
| |
| |
| |
The Hughes, Hilber and Taylor (HHT) alpha-Method | |
| |
| |
| |
The Wood, Bossak and Zienkiewicz (WBZ) alpha-Method | |
| |
| |
| |
The Generalised-alpha Algorithm | |
| |
| |
| |
Piecewise Linear Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Shock-Response Spectrum | |
| |
| |
| |
Introduction | |
| |
| |
| |
Enforced Acceleration | |
| |
| |
| |
Numerical Calculation of the SRS, the Piecewise Exact Method | |
| |
| |
| |
Response Analysis in Combination with Shock-Response Spectra | |
| |
| |
| |
Matching Shock Spectra with Synthesised Time Histories | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Random Vibration of Linear Dynamic Systems | |
| |
| |
| |
Introduction | |
| |
| |
| |
Random Process | |
| |
| |
| |
Power-Spectral Density | |
| |
| |
| |
Deterministic Linear Dynamic System | |
| |
| |
| |
Force-Loaded Sdof System | |
| |
| |
| |
Enforced Acceleration | |
| |
| |
| |
Multi-Inputs and Single Output (MISO) | |
| |
| |
| |
Deterministic Mdof Linear Dynamic System | |
| |
| |
| |
Random Forces | |
| |
| |
| |
Random Base Excitation | |
| |
| |
| |
Random Stresses and Forces | |
| |
| |
| |
Analysis of Narrow-Band Processes | |
| |
| |
| |
Crossings | |
| |
| |
| |
Fatigue Damage due to Random Excitation | |
| |
| |
| |
Some Practical Aspects | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Problem 4 | |
| |
| |
| |
Problem 5 | |
| |
| |
| |
Low-Frequency Acoustic Loads, Structural Responses | |
| |
| |
| |
Introduction | |
| |
| |
| |
Acoustic Loads | |
| |
| |
| |
Equations of Motion | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
Statistical Energy Analysis | |
| |
| |
| |
Introduction | |
| |
| |
| |
Some Basics about Averaged Quantities | |
| |
| |
| |
Two Coupled Oscillators | |
| |
| |
| |
Multimode Subsystems | |
| |
| |
| |
SEA Parameters | |
| |
| |
| |
Subsystem Modal Densities | |
| |
| |
| |
Source Power Input | |
| |
| |
| |
Subsystem Energies | |
| |
| |
| |
Damping Loss Factor | |
| |
| |
| |
Coupling Loss Factor | |
| |
| |
| |
Stresses and Strains | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Problem 4 | |
| |
| |
| |
Problem 5 | |
| |
| |
| |
Problem 6 | |
| |
| |
| |
Problem 7 | |
| |
| |
| |
Problem 8 | |
| |
| |
| |
Free-free Dynamic Systems, Inertia Relief | |
| |
| |
| |
Introduction | |
| |
| |
| |
Relative Motion | |
| |
| |
| |
Relative Forces | |
| |
| |
| |
Flexibility Matrix | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Mode Acceleration Method | |
| |
| |
| |
Introduction | |
| |
| |
| |
Decomposition of Flexibility and Mass Matrix | |
| |
| |
| |
Decomposition of the Flexibility Matrix | |
| |
| |
| |
Decomposition of the Mass Matrix | |
| |
| |
| |
Convergence Properties of Reconstructed Matrices | |
| |
| |
| |
Mode Acceleration Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Problem 4 | |
| |
| |
| |
Problem 5 | |
| |
| |
| |
| |
| |
| |
Introduction | |
| |
| |
| |
Residual Vectors | |
| |
| |
| |
Dickens Method | |
| |
| |
| |
Rose Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Dynamic Model Reduction Methods | |
| |
| |
| |
Introduction | |
| |
| |
| |
Static Condensation Method | |
| |
| |
| |
Improved Calculation of Eliminated Dofs | |
| |
| |
| |
Dynamic Reduction | |
| |
| |
| |
Improved Reduced System (IRS) | |
| |
| |
| |
Craig-Bampton Reduced Models | |
| |
| |
| |
Generalised Dynamic Reduction | |
| |
| |
| |
System Equivalent Reduction Expansion Process (SEREP) | |
| |
| |
| |
Ritz Vectors | |
| |
| |
| |
Conclusion | |
| |
| |
| |
| |
| |
| |
Introduction | |
| |
| |
| |
The Unified CMS Method | |
| |
| |
| |
Modal Truncation | |
| |
| |
| |
General Synthesis of Two Components | |
| |
| |
| |
General Example | |
| |
| |
| |
Special CMS Methods | |
| |
| |
| |
Craig-Bampton Fixed-Interface Method | |
| |
| |
| |
Free-Interface Method | |
| |
| |
| |
General-Purpose CMS Method | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Load Transformation Matrices | |
| |
| |
| |
Introduction | |
| |
| |
| |
Reduced Model with Boundary Conditions | |
| |
| |
| |
Reduced Free-Free Dynamic Model | |
| |
| |
| |
Continuous Dynamic Systems | |
| |
| |
| |
Problems | |
| |
| |
| |
Problem 1 | |
| |
| |
| |
Problem 2 | |
| |
| |
| |
Problem 3 | |
| |
| |
| |
Problem 4 | |
| |
| |
References | |
| |
| |
Author Index | |
| |
| |
Subject Index | |