Two-dimensional optical coherence vibration tomography for low-frequency vibration measurement and response-only modal analysis. (15th October 2016)

• Record Type: Journal Article
• Authors: Zhong, Jianfeng; Zhong, Shuncong; Zhang, Qiukun
• Is Part Of: Mechanical systems and signal processing. Volume 79(2016)
• Page Start: 65
• Page End: 71
• Publication Date: 2016-10-15
• Subjects: Two-dimensional optical coherence tomography -- Line vibration measurement -- Three-dimension surface vibration -- Modal analysis; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2016.02.027
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: A high-speed camera-based two-dimensional optical coherence vibration tomography (2DOCVT) system with a subnanometre displacement resolution was developed and employed for low-frequency vibration measurement and modal analysis. Experimental results demonstrated the ability of low-frequency absolute displacement measurement of structural line vibrations without scanning. Three-dimensional (3D) surface displacement of a vibrating structure could also be obtained using the developed 2DOCVT by scanning the structure. The scanning 2DOCVT system acted like a 3D optical coherence vibration tomography system. The developed 2DOCVT system could capture structural modal parameters without vibration excitation input information, and therefore, it is a response-only method. The 2DOCVT could be recommended in the application of low-frequency vibration measurement and modal analysis of beam and plate structures, especially when the vibration amplitude is at nanometre or micrometre scale. Highlights: A subnanometre-resolution 2DOCVT system was developed for low-frequency vibration measurement and modal analysis. Three-dimensional displacement of vibrating structures could be obtained using the 2DOCVT by scanning the structures. The 2DOCVT is a response-only method that could capture structural modal parameters without input information.