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Alexander Peiffer
Vibroacoustic Simulation
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Vibroacoustic Simulation An Introduction to Statistical Energy Analysis and Hybrid Methods
Страница 3
Страница 4
Contents
List of Illustrations
List of Tables
Guide
Pages
Preface
Acknowledgments
Acronyms
1 Linear Systems, Random Process and Signals
1.1 The Damped Harmonic Oscillator
1.1.1 Homogeneous Solutions
1.1.2 The Overdamped Oscillator (ζ > 1)
1.1.3 The Underdamped Oscillator (ζ < 1)
1.1.4 The Critically Damped Oscillator (ζ = 1)
1.2 Forced Harmonic Oscillator
1.2.1 Frequency Response
1.2.2 Energy, Power and Impedance
1.2.3 Impedance and Response Functions
1.2.3.1 Power Balance
1.2.4 Damping
1.2.5 Damping in Real Systems
1.2.5.1 Hysteretic Damping
1.3 Two Degrees of Freedom Systems (2DOF)
1.3.1 Natural Frequencies of the 2DOF System
1.3.1.1 Forced Vibration of the 2DOF System
1.3.1.2 Dynamic Vibration Absorber
1.4 Multiple Degrees of Freedom Systems MDOF
1.4.1 Assembling the Mass Matrix
1.4.2 Assembling the Stiffness Matrix
1.4.3 Power Input into MDOF Systems
1.4.4 Normal Modes
1.4.4.1 Equation of Motion in Modal Coordinates
1.5 Random Process
1.5.1 Probability Function
1.5.2 Correlation Coefficient
1.5.3 Correlation Functions for Random Time Signals
1.5.4 Fourier Analysis of Random Signals
1.5.5 Estimation of Power and Cross Spectra
1.6 Systems
1.6.1 SISO-System Response in Frequency Domain
1.6.2 System Response in Time Domain
1.6.3 Systems Excited by Random Signals
1.7 Multiple-input–multiple-output Systems
1.7.1 Multiple Random Inputs
1.7.1.1 Fully Uncorrelated Signals – Rain on the Roof Excitation
1.7.1.2 Fully Correlated Signals
1.7.2 Response of MIMO Systems to Random Load
Bibliography
Notes
2 Waves in Fluids 2.1 Introduction
2.2 Wave Equation for Fluids 2.2.1 Conservation of Mass
2.2.2 Newton’s law – Conservation of Momentum
2.2.3 Equation of State
2.2.4 Linearized Equations
2.2.5 Acoustic Wave Equation
2.3 Solutions of the Wave Equation
2.3.1 Harmonic Waves
2.3.2 Helmholtz equation
2.3.3 Field Quantities: Sound Intensity, Energy Density and Sound Power
2.3.4 Damping in Waves
2.4 Fundamental Acoustic Sources
2.4.1 Monopoles – Spherical Sources
2.4.1.1 Field Properties of Spherical Waves
2.4.1.2 Field Intensity, Power and Source Strength
2.4.1.3 Power and Radiation Impedance at the Surface Sphere
2.4.1.4 Point Sources
2.5 Reflection of Plane Waves
2.6 Reflection and Transmission of Plane Waves
2.7 Inhomogeneous Wave Equation
2.7.1 Acoustic Green’s Functions
2.7.2 Rayleigh integral
2.7.3 Piston in a Wall
2.7.3.1 Impedance Concept
2.7.3.2 Inertia Effects
2.7.4 Power Radiation
2.7.4.1 Radiation Efficiency
2.8 Units, Measures, and levels
Bibliography
Notes
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