Local structural nonlinearities identification based on the minimum error linear frequency response function

Abstract

Purpose

The purpose of this paper is to consider the dynamic characteristics identification of local structural nonlinearities.

Design/methodology/approach

Proposed identification method is based on minimum error linear frequency response function (MELF). Two different techniques are developed to extract nonlinear element's dynamic behavior from MELF. The first method, in which no pre‐assumed model is considered for the nonlinearity mechanism behavior, is called “direct identification method.” The second method is “model based identification method.”

Findings

Cubic stiffness dynamic characteristics are identified using the proposed techniques as a case study.

Originality/value

The paper shows that the proposed identification technique is simple and free of any sophisticated measurement hardwares and constraints, which is required by most of the methods proposed so far.

Citation

Kashani, H. and Nobari, A.S. (2009), "Local structural nonlinearities identification based on the minimum error linear frequency response function", Aircraft Engineering and Aerospace Technology, Vol. 81 No. 6, pp. 522-528. https://doi.org/10.1108/00022660910997829