NDLI: Modeling of Abradable Coating Removal in Aircraft Engines Through Delay Differential Equations

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Salvat, Nicolas Batailly, Alain Legrand, Mathias
Copyright Year	2013
Abstract	In modern turbomachinery, abradable materials are implemented on casings to reduce operating tip clearances and mitigate direct unilateral contact occurrences between rotating and stationary components. However, both experimental and numerical investigations revealed that blade/abradable interactions may lead to blade failures. In order to comprehend the underlying mechanism, an accurate modeling of the abradable removal process is required. Time-marching strategies where the abradable removal is modeled through plasticity are available but another angle of attack is proposed in this work. It is assumed that the removal of abradable liners shares similarities with machine tool chatter encountered in manufacturing. Chatter is a self-excited vibration caused by the interaction between the machine and the workpiece through the cutting forces, and the corresponding dynamics are efficiently captured by delay differential equations. They differ from ordinary differential equations in that previous states of the system are involved. This mathematical framework is here employed for the exploration of the blade stability during abradable removal. The proposed tool advantageously features a reduced computational cost and consistency with existing time-marching solution methods. Potentially dangerous interaction regimes are accurately predicted and instability lobes match both flexural and torsional modal responses. Essentially, the regenerative nature of chatter in machining processes can also be attributed to abradable coating removal in turbomachinery.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791855270
DOI	10.1115/GT2013-94400
Volume Number	Volume 7B: Structures and Dynamics
Conference Proceedings	ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2013-06-03
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Stability Vibration Blades Delay differential equations Machining Turbomachinery Aircraft engines Coatings Modeling Machinery Chatter Cutting Dynamics (mechanics) Differential equations Plasticity Coating processes Machine tools Manufacturing Failure
Content Type	Text
Resource Type	Article

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