Study on applicability of a contactless measurement method for vibration stress using laser displacement sensors

Abstract

This study presented a contactless method to measure vibration-induced stress (vibration stress) using multiple laser displacement sensors and the applicability of the method was investigated using beam theory and vibration test. First, the measurement errors were discussed based on the beam theory when the method was applied to the measurement of piping vibration. The classification of the errors caused in the measurement was clarified and the measurement accuracy was estimated by taking these errors into account. Next, the vibration test by the random excitation using the beam-plate was conducted and the applicability and measurement accuracy of the presented method was examined. By comparing with the vibration stress values measured by the conventional method using strain gauges, the presented method was demonstrated to be applicable to the vibration stress measurement. Additionally the awaiting solution for the practical use was extracted.

Keywords

• vibration measurement
• contactless measurement
• laser sensor
• vibration-induced stress
• vibration stress
• applicability
• measurement accuracy
• vibration test