%0 Journal Article %T Identifying phase-varying periodic behaviour in conservative nonlinear systems %A Dongxiao Hong %A Evangelia Nicolaidou %A Simon A. Neild %A Thomas L. Hill %J - %D 2020 %R 10.1098/rspa.2020.0028 %X Nonlinear normal modes (NNMs) are a widely used tool for studying nonlinear mechanical systems. The most commonly observed NNMs are synchronous (i.e. single-mode, in-phase and anti-phase NNMs). Add.. %U https://royalsocietypublishing.org/doi/10.1098/rspa.2020.0028