Coating methods to increase structural damping of compressor blades – measurements and modeling
2011 (English)Report (Other academic)
Methods are developed to improve the damping performance of compressor blades, where hard coating technique isapplied to increase the structural damping, displaying both measurements and modeling results. Two specimens madeof titanium and stainless steel, respectively, are treated by aluminum oxide and epoxy coating materials. Dampingmeasurements of simple beam specimens without and with treatments are carried out and results show that both treat-ments give an increase in damping, where aluminum oxide treatment is more eective than the corresponding epoxytreatment. The simple damping layer structure is modeled analytically to predict the total damping of the combinedstructure as well as the material damping of the coating layer. A real compressor blade treated by aluminum oxideis studied by using the half-power bandwidth and modal strain energy methods, respectively, to calculate the totaldamping of the blade. Two types of meshing strategies are implemented while showing a good agreement. Parametricanalyses are performed with the variations of the coating thickness and coating distribution, respectively. As a result,increased structural damping gives decreased peak stress values and will therefore prolong the life of compressorblades.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-101240OAI: oai:DiVA.org:kth-101240DiVA: diva2:546884
QC 201208272012-08-252012-08-252012-08-27Bibliographically approved