文档介绍：STRUCTURAL TESTING
Part II: Modal Analysis and Simulation
by
Ole Døssing, Brüel&Kjær
Experimental Modal Analysis………………………………. 2 What is Curve-fitting? ..................................................... 29
All Structures Exhibit Modal Behaviour………………... 4 Curve-fitters for Modal Analysis .................................. 30
Single-degree-of-freedom (SDOF) Models……………….. 6 Local and Global Curve-fitters ..................................... 32
SDOF Models in the Frequency Domain ...............…...... puter-aided Modal Testing ..................................... 33
A Closer Look at Pole Location and Residue .....……..... 9 Step 1 - Setting up the Modal Test .......................... 34
The DOF and MDOF models ....….................................... 10 Step 2 - Making the Measurements .......................... 36
What is a Mode Shape? ................................................. 11 Step 3 - Parameter Estimation by Curve-fitting .... 37
Normal Modes plex Modes .......................... 12 Step 4 - Documentation of the Test .......................... 38
How Residues Relate to Mode Shapes ...................... 13 The Dynamic Modal Model ............................................ 40
Scaling the Mode Shapes .............................................. 14 Checking and Applying the Model ............................. 41
Modal Coupling ................................................................ 15 Considerations of pleteness .................... 42
What Does the Modal Description Assume? ............ puter Simulations .................................................... 43
Practical Structures ......................................................... 17 Response Simulation ...................................................... 44
The Lumped-parameter Model and Modal Theory . 18 Modification Simulation .................................................. 46
The Modal Space ............................................