Development of an image-based experimental modal analysis method based on phase-based motion magnification

Abstract

Conventionally, experimental modal analysis has been conducted with physical sensors such as laser displacement sensors and accelerometers. However, the number of sensors and their placement locations are limited. Therefore, it is difficult to measure the vibration of large-scale structures with physical sensors. Thus, large-scale experimental modal analysis by image processing is drawing attention. In this study, we propose a novel experimental modal analysis method based on Phase-based motion magnification (PBMM) that can magnify the vibration in a specified frequency and visualize the vibration shapes. In this report, we discuss the validity of the vibration mode shapes of cantilever beam visualized by PBMM.