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Mechanical Vibration and Shock Analysis Volume 2 Mechanical Shock 3rd Edition by Christian Lalanne ISBN 978-1848216457 1848216459

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Mechanical Vibration and Shock Analysis Volume 2 Mechanical Shock 3rd Edition Christian Lalanne Digital Instant Download

Author(s): Christian Lalanne
ISBN(s): 9781848216457, 1848216459
Edition: 3rd
File Details: PDF, 11.03 MB
Year: 2014
Language: english
SKU: EB-7307242 Category: Tag:

Mechanical Vibration and Shock Analysis Volume 2 Mechanical Shock 3rd Edition by Christian Lalanne – Ebook PDF Instant Download/Delivery:  978-1848216457, 1848216459
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ISBN 10:  1848216459

ISBN 13: 978-1848216457

Author: Christian Lalanne

This volume considers the shock response spectrum, its various definitions, properties and the assumptions involved in its calculation. In developing the practical application of these concepts, the forms of shock most often used with test facilities are presented together with their characteristics and indications of how to establish test configurations comparable with those in the real, measured environment. This is followed by a demonstration of how to meet these specifications using standard laboratory equipment – shock machines, electrodynamic exciters driven by a time signal or a response spectrum – with a discussion on the limitations, advantages and disadvantages of each method.
 

Table of contents: 

Chapter 1. Shock Analysis

  • Definitions

    • Shock

    • Transient Signal

    • Jerk

    • Simple (or Perfect) Shock

    • Half-Sine Shock

    • Versed Sine (or Haversine) Shock

    • Terminal Peak Sawtooth (TPS) Shock (or Final Peak Sawtooth FPS)

    • Initial Peak Sawtooth (IPS) Shock

    • Square Shock

    • Trapezoidal Shock

    • Decaying Sinusoidal Pulse

    • Bump Test

    • Pyroshock

  • Analysis in the Time Domain

  • Temporal Moments

  • Fourier Transform

    • Definition

    • Reduced Fourier Transform

    • Fourier Transforms of Simple Shocks

    • What Represents the Fourier Transform of a Shock?

    • Importance of the Fourier Transform

  • Energy Spectrum

    • Energy According to Frequency

    • Average Energy Spectrum

  • Practical Calculations of the Fourier Transform

    • General

    • Case: Signal Not Yet Digitized

    • Case: Signal Already Digitized

    • Adding Zeros to the Shock Signal Before the Calculation of Its Fourier Transform

    • Windowing

  • The Interest of Time-Frequency Analysis

    • Limit of the Fourier Transform

    • Short Term Fourier Transform (STFT)

    • Wavelet Transform

Chapter 2. Shock Response Spectrum

  • Main Principles

  • Response of a Linear One-Degree-of-Freedom System

    • Shock Defined by a Force

    • Shock Defined by an Acceleration

    • Generalization

    • Response to Simple Shocks

  • Definitions

    • Response Spectrum

    • Absolute Acceleration SRS

    • Relative Displacement Shock Spectrum

    • Primary (Initial) Positive SRS

    • Primary (Initial) Negative SRS

    • Secondary (Residual) SRS

    • Positive (Maximum Positive) SRS

    • Negative (Maximum Negative) SRS

    • Maximax SRS

  • Standardized Response Spectra

    • Definition

    • Half-Sine Pulse

    • Versed Sine Pulse

    • Terminal Peak Sawtooth Pulse

    • Initial Peak Sawtooth Pulse

    • Square Pulse

    • Trapezoidal Pulse

  • Choice of the Type of SRS

  • Comparison of the SRS of the Usual Simple Shapes

  • SRS of a Shock Defined by an Absolute Displacement of the Support

  • Influence of Amplitude and Duration on SRS

  • Difference Between SRS and Extreme Response Spectrum (ERS)

  • Algorithms for Calculation of the SRS

  • Subroutine for Calculation of the SRS

  • Choice of Sampling Frequency of the Signal

  • Example of Use of the SRS

  • Use of SRS for Systems with Several Degrees of Freedom

  • Damage Boundary Curve

Chapter 3. Properties of Shock Response Spectra

  • Shock Response Spectra Domains

  • Properties of SRS at Low Frequencies

  • Properties of SRS at High Frequencies

  • Damping Influence

  • Choice of Damping

  • Choice of Frequency Range

  • Choice of Number of Points and Their Distribution

  • Charts

  • Relation of SRS with Fourier Spectrum

  • Care to Be Taken in the Calculation of Spectra

  • Specific Case of Pyroshocks

  • Pseudo-Velocity Shock Spectrum

  • Use of SRS for Pyroshocks

  • Other Propositions of Spectra

Chapter 4. Development of Shock Test Specifications

  • Introduction

  • Simplification of the Measured Signal

  • Use of Shock Response Spectra

  • Other Methods

  • Interest Behind Simulation of Shocks on Shaker Using a Shock Spectrum

Chapter 5. Kinematics of Simple Shocks

  • Introduction

  • Half-Sine Pulse

  • Versed Sine Pulse

  • Square Pulse

  • Terminal Peak Sawtooth Pulse

  • Initial Peak Sawtooth Pulse

Chapter 6. Standard Shock Machines

  • Main Types

  • Impact Shock Machines

  • High Impact Shock Machines

  • Pneumatic Machines

  • Specific Testing Facilities

  • Programmers

Chapter 7. Generation of Shocks Using Shakers

  • Principle Behind Generation of a Signal with a Simple Shape

  • Advantages of Using Shakers

  • Limitations of Electrodynamic Shakers

  • Remarks on Electrohydraulic Shakers

  • Pre- and Post-Shocks

  • Incidence on Quality of Simulation

Chapter 8. Control of a Shaker Using a Shock Response Spectrum

  • Principle of Control Using a Shock Response Spectrum

  • Decaying Sinusoid

  • D.L. Kern and C.D. Hayes’ Function

  • ZERD Function

  • WAVSIN Waveform

  • SHOC Waveform

  • Comparison of Waveforms

  • Waveforms Based on Cosm(x) Window

  • Use of a Fast Swept Sine

  • Problems During Synthesis of Waveforms

  • Criticism of Control by SRS

  • Possible Improvements

  • Estimate of Feasibility of a Shock Specified by Its SRS

Chapter 9. Simulation of Pyroshocks

  • Simulations Using Pyrotechnic Facilities

  • Simulation Using Metal-to-Metal Impact

  • Simulation Using Electrodynamic Shakers

  • Simulation Using Conventional Shock Machines

Appendix. Similitude in Mechanics

  • Conservation of Materials

  • Conservation of Acceleration and Stress

Mechanical Shock Tests: A Brief Historical Background
Bibliography
Index
Summary of Other Volumes in the Series

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