The most important vibrations parameters for nonlinear systems are exactly the same as for linear systems: frequency, decay rate and amplitude. The main difference is that the frequency and decay rate of nonlinear system responses can be time‐varying. Furthermore, nonlinear systems have multiple solutions and each one may be associated to different vibration parameter values. This chapter introduces a number of techniques for estimating the properties of response data from nonlinear aeroelastic systems, experimental or numerical. The methodologies rely on signal processing and nonlinear dynamics approaches. Some of them are applied to numerical data after the response has been calculated. Other techniques need to be implemented in the time integration scheme for best results. The main objective is to obtain as much information as possible from the responses without carrying out an excessive number of calculations.
Determining the Vibration Parameters
Introduction to Nonlinear Aeroelasticity ; 113-157
2017-03-28
45 pages
Article/Chapter (Book)
Electronic Resource
English
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