Diagnosis of crack in rotating systems, through the methodology of state observer

• Grant number: 15/20219-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2015
• End date: October 31, 2016
• Field of knowledge: Engineering - Mechanical Engineering - Mechanical Engineering Design
• Principal Investigator: Gilberto Pechoto de Melo
• Grantee: Camilo Rocha Araujo
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

Currently, one of the factors of interest from industries in developing new fault detection and location techniques is concern about the security of their systems, and the need for supervision and monitoring so that the fault is detected and corrected as quickly as possible. It is found in practice that certain parameters of the systems may vary during the process due to features and failures or natural wear of its components. It is also known that even in well-designed rotary systems, the occurrence of cracks in some components, primarily the shaft, can cause economic losses or lead to dangerous situations. State observers can reconstruct the unmeasured states of the system, provided that they are observable with the number of measurements, making it possible to estimate the measurements in inaccessible places. The technique of the state observer consists of developing a model for the system under consideration and compare the estimated output with measured output, whereas the difference between the two signals present results in a residue which is used in the analysis. This work will mount an observer seat associated with a crack model in order to monitor its progress. The results obtained through computer simulations of a rotor, modeled and discretized by the finite element technique and analyzed by the technique of state observers, will later be validated with experimental analysis, using an existing rotor in the laboratory.