Challenges of Characterizing Geometric Nonlinearity of a Double-Clamped Thin Beam Using Nonlinear Modal Testing Methods

2021 ◽  
pp. 179-188
Author(s):  
Mahesh Nagesh ◽  
Randall J. Allemang ◽  
Allyn W. Phillips
Keyword(s):  
Geometric Nonlinearity ◽  
Modal Testing ◽  
Testing Methods ◽  
Thin Beam

A review of multishaker excitation modal testing methods

2005 ◽  
Vol 118 (3) ◽  
pp. 1928-1928
Author(s):  
Arun Menon ◽  
Weijie Zhao
Keyword(s):  
Modal Testing ◽  
Testing Methods

Characterization of Nonlinearities in a Structure Using Nonlinear Modal Testing Methods

2021 ◽  
pp. 167-178
Author(s):  
Mahesh Nagesh ◽  
Randall J. Allemang ◽  
Allyn W. Phillips
Keyword(s):  
Modal Testing ◽  
Testing Methods

Complex Modal Testing Methods for Rotating Machinery

1991 ◽  
Author(s):  
Chong-Won Lee ◽  
Young-Don Joh
Keyword(s):  
Frequency Response ◽  
Rotating Machinery ◽  
Modal Testing ◽  
Response Functions ◽  
Testing Methods ◽  
Complex Signals ◽  
Indirect Assessment ◽  
Testing Method ◽  
Effective Use ◽  
Complex Modal

Abstract Various modal testing methods are proposed for the effective use of complex modal testing for rotating machinery, focusing on excitations and measurements. The proposed methods are developed, based on the input/output relationships for complex signals, for the direct or indirect assessment of frequency response and coherence functions between complex inputs and outputs. The proposed testing methods and the classical modal testing method are compared in consideration of required number of frequency response functions (FRFs) and testing efforts.

scholarly journals Experimental and numerical identification of structural modes for engineering education

2014 ◽  
Vol 12 (2) ◽  
pp. 161-172
Author(s):  
Aleksandar Borkovic ◽  
Dragan Milasinovic ◽  
Valentina Golubovic-Bugarski ◽  
Ognjen Mijatovic ◽  
Manuel Desancic
Keyword(s):  
Structural Dynamics ◽  
Normal Modes ◽  
Free Vibration Analysis ◽  
Modal Testing ◽  
Testing Methods ◽  
Visual Patterns ◽  
Wolfram Mathematica ◽  
Plate Models ◽  
Element Free ◽  
Good Agreement

Development of simple classroom demonstration device and software for visualization of structural normal modes is presented. Device is made of parts of old speaker, controlled with personal computer, where the harmonic motion of solenoid is used as an excitation for beam and plate models. Simple code for finite element free vibration analysis of plates is written in Wolfram Mathematica. Good agreement of results and attractive visual patterns of normal modes attracted attention of students. Results are confirmed using modern modal testing methods. Presented approach is complementary to standard teaching of structural dynamics.

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