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Planar position of the friction pendulum‐element (output node 1) over the time period of excitation; friction coefficent μ = 0.08; x‐axes ... slider displacement in x‐direction [m], y‐axes ... slider displacement y‐direction [m]; blue line ... full response; red line ... proper orthogonal decomposition response; green line ... modal truncation response. [Colour figure can be viewed at wileyonlinelibrary.com]
