An improved multiple per revolution-based blade tip timing method and its applications on large-scale compressor blades. (15th March 2022)

• Record Type: Journal Article
• Authors: Fan, Zhenfang; Li, Hongkun; Dong, Jiannan; Zhao, Xinwei
• Is Part Of: Mechanical systems and signal processing. Volume 167:Part A(2022)
• Publication Date: 2022-03-15
• Subjects: Blade Tip Timing -- Speed fluctuation per revolution -- Once per revolution -- Multiple per revolution -- Compressor blades; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2021.108538
• Languages: English
• ISSNs: 0888-3270

Abstract

Highlight: Based on the assumption of linear change of speed, measurement error induced by the speed fluctuation per revolution (SFPR) is studied. An improved multiple per revolution-based blade tip timing method is proposed. Simulations and experiments investigate the feasibility and superiority of the MPR method. The MPR technology is applied to blade vibration monitoring of two large-scale Compressors. Abstract: Blade Tip Timing (BTT) is one of the most effective technologies for blade vibration measurement of turbomachinery. The blade vibration measurement indicates the operational status of the blades, which is of great significance for blade health management and fault diagnosis. However, the approaches and applications of BTT technologies are still facing enormous challenges. This study, based on the traditional once per revolution (OPR) methods, the measurement error of blade vibration induced by the speed fluctuation per revolution (SFPR) is investigated. Considering the effect of the SFPR, an improved multiple per revolution-based BTT method (MPR) for calculating the blade vibration is proposed. Furthermore, numerical simulation and experimental work of the MPR method are executed. Compared with the results of different technologies, the feasibility and reliability of the MPR method are verified by theoretical analysis and experimental verification. The MPR technology is also applied to blade vibration measurement of a large-scale Centrifugal Compressor and a large-scale Axial-Centrifugal Compressor. The conclusions of applications are well practical.