Video-based lateral vibration characteristics extraction in operational rotor systems

Video sequences endowed with high-density spatial resolution provide a new approach to vibration measurement, replacing conventional sensing devices. Based on the vibration measurement requirements of the operational rotor system, this study proposed a method to extract rotor systems’ full-field lateral vibration signals based on phase-based video processing technology. The method was validated on a test rig, covering steady-state and dynamic-state conditions, and compared with eddy current sensors for accuracy verification. It also enabled the measurement of rotor vibration shapes. Additionally, building upon phase-based motion amplification technique, we introduce adaptive input parameters for rotor vibration amplification to streamline the visualization process and reduce subjective assessments of vibration amplitudes via color mapping. The findings of this study demonstrate that the video-based rotor system measurement method achieves accuracy close to the eddy current displacement sensors while offering significant advantages in measurement range, application complexity, and visualization.