Modal Testing

Informationen zum Autor PETER AVITABILE is Professor Emeritus at the University of Massachusetts Lowell, the co-director of the Structural Dynamics and Acoustic Systems Laboratory, and the former President for the Society for Experimental Mechanics. In addition, he is the Associate Editor of the Handbook for Experimental Structural Mechanics. He has written hundreds of papers and articles on analytical and experimental modal analysis techniques, including the Modal Space article series published in SEM's Experimental Techniques. Klappentext The practical, clear, and concise guide for conducting experimental modal testsModal Testing: A Practitioner's Guide outlines the basic information necessary to conduct an experimental modal test. The text draws on the author's extensive experience to cover the practical side of the concerns that may arise when performing an experimental modal test. Taking a hands-on approach, the book explores the issues related to conducting a test from start to finish. It covers the cornerstones of the basic information needed and summarizes all the pertinent theory related to experimental modal testing.Designed to be accessible, Modal Testing presents the most common excitation techniques used for modal testing today and is filled with illustrative examples related to impact testing which is the most widely used excitation technique for traditional experimental modal tests. This practical text is not about developing the details of the theory but rather applying the theory to solve real-life problems, and: Delivers easy to understand explanations of complicated theoretical concepts Presents basic steps of an experimental modal test Offers simple explanations of methods to obtain good measurements and avoid the common blunders typically found in many test approaches Focuses on the issues to be faced when performing an experimental modal test* Contains full-color format that enhances the clarity of the figures and presentationsModal Testing: A Practitioner's Guide is a groundbreaking reference that treats modal testing at the level of the practicing engineer or a new entrant to the field of experimental dynamic testing. Zusammenfassung The practical, clear, and concise guide for conducting experimental modal tests Modal Testing: A Practitioner's Guide outlines the basic information necessary to conduct an experimental modal test. Inhaltsverzeichnis Preface xv About the CompanionWebsite xix Part I Overview of Experimental Modal Analysis using the Frequency Response Method 1 1 Introduction to ExperimentalModal Analysis: A Simple Non-mathematical Presentation 3 1.1 Could you Explain Modal Analysis to Me? 6 1.2 Just what are these Measurements called FRFs? 10 1.2.1 Why is Only One Row or Column of the FRF Matrix Needed? 13 1.3 What's the Difference between a Shaker Test and an Impact Test? 17 1.3.1 What Measurements do we Actually make to Compute the FRF? 18 1.4 What's the Most ImportantThing toThink about when Impact Testing? 21 1.5 What's the Most ImportantThing toThink about when Shaker Testing? 22 1.6 Tell me More AboutWindows; They Seem Pretty Important! 24 1.7 So how do we get Mode Shapes from the Plate FRFs? 25 1.8 Modal Data and Operating Data 29 1.8.1 What is Operating Data? 29 1.8.2 So what Good is Modal Data? 33 1.8.3 So Should I Collect Modal Data or Operating Data? 34 1.9 Closing Remarks 36 2 General Theory of Experimental Modal Analysis 37 2.1 Introduction 37 2.2 Basic Modal AnalysisTheory - SDOF 38 2.2.1 Single Degree of Freedom System Equation 38 2.2.2 Single Degree of Freedom System Response due to Harmonic Excitation 40 2.2.3 Damping Estimation for Single Degree of Freedom System 42 2.2.4 Response Assessment with Varying D...

Auteur

PETER AVITABILE is Professor Emeritus at the University of Massachusetts Lowell, the co-director of the Structural Dynamics and Acoustic Systems Laboratory, and the former President for the Society for Experimental Mechanics. In addition, he is the Associate Editor of the Handbook for Experimental Structural Mechanics. He has written hundreds of papers and articles on analytical and experimental modal analysis techniques, including the Modal Space article series published in SEM's Experimental Techniques.

Texte du rabat

The practical, clear, and concise guide for conducting experimental modal tests Modal Testing: A Practitioner's Guide outlines the basic information necessary to conduct an experimental modal test. The text draws on the author's extensive experience to cover the practical side of the concerns that may arise when performing an experimental modal test. Taking a hands-on approach, the book explores the issues related to conducting a test from start to finish. It covers the cornerstones of the basic information needed and summarizes all the pertinent theory related to experimental modal testing. Designed to be accessible, Modal Testing presents the most common excitation techniques used for modal testing today and is filled with illustrative examples related to impact testing which is the most widely used excitation technique for traditional experimental modal tests. This practical text is not about developing the details of the theory but rather applying the theory to solve real-life problems, and: Delivers easy to understand explanations of complicated theoretical concepts Presents basic steps of an experimental modal test Offers simple explanations of methods to obtain good measurements and avoid the common blunders typically found in many test approaches Focuses on the issues to be faced when performing an experimental modal test * Contains full-color format that enhances the clarity of the figures and presentations Modal Testing: A Practitioner's Guide is a groundbreaking reference that treats modal testing at the level of the practicing engineer or a new entrant to the field of experimental dynamic testing.

Contenu

Preface xv

About the CompanionWebsite xix

Part I Overview of Experimental Modal Analysis using the Frequency Response Method 1

1 Introduction to ExperimentalModal Analysis: A Simple Non-mathematical Presentation 3

1.1 Could you Explain Modal Analysis to Me? 6

1.2 Just what are these Measurements called FRFs? 10

1.2.1 Why is Only One Row or Column of the FRF Matrix Needed? 13

1.3 What's the Difference between a Shaker Test and an Impact Test? 17

1.3.1 What Measurements do we Actually make to Compute the FRF? 18

1.4 What's the Most ImportantThing toThink about when Impact Testing? 21

1.5 What's the Most ImportantThing toThink about when Shaker Testing? 22

1.6 Tell me More AboutWindows; They Seem Pretty Important! 24

1.7 So how do we get Mode Shapes from the Plate FRFs? 25

1.8 Modal Data and Operating Data 29

1.8.1 What is Operating Data? 29

1.8.2 So what Good is Modal Data? 33

1.8.3 So Should I Collect Modal Data or Operating Data? 34

1.9 Closing Remarks 36

2 General Theory of Experimental Modal Analysis 37

2.1 Introduction 37

2.2 Basic Modal AnalysisTheory - SDOF 38

2.2.1 Single Degree of Freedom System Equation 38

2.2.2 Single Degree of Freedom System Response due to Harmonic Excitation 40

2.2.3 Damping Estimation for Single Degree of Freedom System 42

2.2.4 Response Assessment with Varying Damping 43

2.2.5 Laplace Domain Approach for Single Degree of Freedom System 46

2.2.6 System Transfer Function 47

2.2.7 Different Forms of the Transfer Function 48

2.2.8 Residue of the SDOF System 49

2.2.9 Frequency Response Function for a Single Degree of Freedom System 49

2.2.10 Transfer Function/Frequency Response Function/S-plane for a Single Degree of Freedom System 51

2.2.11 Frequency Response Function Regions for a Single Degree of Freedom System 51

2.2.12 Different Forms of the Frequency Response Function 53

2.2.13 Complex Frequency Response Function 53

2.3 Basic Modal AnalysisTheory - MDOF …