The presentation is about a new concept known as Nonlinear Output Frequency
Response Functions (NOFRFs). The new concept allows the analysis to be implemented
in a manner similar to the analysis of linear systems in the frequency domain, and
provides great insight into the mechanisms which dominate the nonlinear behaviour.
The new analysis is helpful for the design of nonlinear systems in the frequency
domain. And this new concept is used to analyze the multi-degree-of-freedom (MDOF)
nonlinear systems. The results reveal very important properties of MDOF systems,
which are of significant importance for the analysis of nonlinear structures. One
important application of the results obtained in this study is the detection and
location of faults in engineering structures which make the structures behave
nonlinearly.

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