Fig. 5From: The influence of vehicle dynamics on the time-dependent resonances of a bridgeThe intact and the damaged bridge instantaneous frequency ridges are displayed in black and red respectively, for two VBI systems; a the VBI system with a car-bridge mass ratio of 0.16 (m1) and a car-bridge frequency ratio of 1.68 and, b the VBI system with a car-bridge mass ratio of 0.32 (m9) and a car-bridge frequency ratio of 0.55Back to article page