Globally convergent observers are designed for a class of systems with monotonic nonlinearities. The approach is to represent the observer error system as the feedback interconnection of a linear system and a time-varying multivariable sector nonlinearity. Using LMI software, observer gain matrices are computed to satisfy the circle criterion and, hence, to drive the observer error to zero. In ...

Erosive wear of the parts gas path an axial compressor a turbine is common reason for premature decommissioning equipment. The creation advanced diagnostic system, which will allow determining level blade erosion according to standard parameters without inspection or disassembly, topical Russian transmission enterprises. paper presents preliminary results applying machine learning methods solve...

Abstract The operating range of a compressor is limited by surge or rotating stall line, among others. Numerical simulations must accurately predict these phenomena. This study based on the experimental CME2, which low-subsonic axial compressor. tip-critical as rotor tip responsible for stall. paper shows that onset flow rate well captured computational fluid dynamics, compared to experiments. ...

Abstract Significant non-synchronous blade vibrations (NSVs) have been observed in an experimental three-stage high-speed compressor at part-speed conditions. High-amplitude acoustic modes, propagating around the circumference and originating highly loaded stage-3, coherence with structural vibration mode. In order to understand occurring phenomena, a detailed numerical study has carried out re...

An axial compressor has high efficiency under design conditions, but its stable working range is narrow. Adjusting the rotational speed can effectively expand range. In this paper, a five-stage for specific compressed air energy storage (CAES) system taken as research object, and different (DRS) characteristics are studied with NUMECA software. Firstly, influence of DRS on overall aerodynamic p...

This paper presents a comprehensive validation and verification study of turbomachinery Reynolds-averaged Navier-Stokes flow solvers on the transonic axial compressor TUDa-GLR-OpenStage. Two commercial namely Ansys CFX Numeca FineTurbo are adopted to provide benchmark solutions, which can be used for other RANS in future. Based these solvers, five sets grids, two advection schemes (i.e., centra...