[4F1] Distinguished overview speaker: Structural multi-dimensional dynamic parameters monitoring based on displacement-sensitive fringe pattern
J Zhong
Fuzhou University, China
Dynamic measurement is one of the basic technologies in modern industry, the accuracy and efficiency of which are of great significance to the development of industrial manufacturing. In recent years, vision-based dynamic measurement technology has been of wide concern and undergone rapid development due to its advantages of non-contact application, high efficiency, high accuracy and no loading effect. Aiming at the problem of existing monocular vision measuring techniques in synchronous measurement for structural 3D vibration and rotational parameter measurement, novel displacement-sensitive fringe pattern (DSFP, ie fringe pattern that is sensitive to displacement change)-based dynamic measurement theories, methods and systems were proposed. The idea originated from the interference fringe-based 3D imaging principle of optical coherence tomography (OCT). Synchronous measurement for 3D structural displacement, rotating shaft 3D displacement, rotation angle and rotation speed could be realised using the novel DSFP as a vibration or rotation angular displacement sensor and using a high-speed camera as a detector. The proposed DSFP-based method provides an effective measurement technique for orbit analysis, order analysis of the rotating machinery and dynamic monitoring of non-rotational structures. The experimental results demonstrate the practicability, convenience, accuracy and reliability of the proposed DSFP-based measurement system. Therefore, the proposed theories and systems provide novel measurement techniques for structural condition monitoring and equipment fault diagnosis, which also demonstrates its potential application value in real engineering.
