Motion Measurement on Rear Swinging Fork

The video shows the appli­ca­tion of a stereo image cor­re­la­tion (phase syn­chro­nized) for a three-dimen­sion­al dis­place­ment mea­sure­ment or move­ment analy­sis (Vic-3D).

The used stereo cam­era sys­tem is based on two 5 Mpix­el cam­eras with a frame rate of 6Hz (at full res­o­lu­tion) in com­bi­na­tion with the isi-sys syn­chro­niza­tion and trig­ger device for stro­bo­scop­ic obser­va­tion of peri­od­ic events.


Four mea­sure­ment areas (hydraulic cylin­der — below, wheel hub — left, swingarm — mid­dle and lin­ear unit — right above) with speck­le pat­terns were mon­i­tored for the eval­u­a­tion. The vec­tor arrows rep­re­sent the cur­rent dis­place­ment state.