IDENTIFICATION OF WEAKLY NONLINEAR-SYSTEMS USING EQUIVALENT LINEARIZATION

Many vibrating systems when experimentally tested show weak non-linear ity. In these cases linear response features such as natural frequenci es and damping ratios though clearly identifiable, nevertheless show a mplitude dependency. This paper describes an approach where the underl ying non-linear differential equation governing the system may be iden tified. As input the equivalent linear response parameters measured ov er a range of amplitudes are used. A commercial aircraft trim panel mo unting is considered as an example to demonstrate the technique. (C) 1 995 Academic Press Limited