Rotating Blade Vibration Reduction Technology Based On Hard Coating

With the continuous development of aerospace technology,the problem of blade damage of aero-engines has become more and more prominent,especially the blade vibration damage caused by high-intensity operation.Therefore,the damping measures for the tail of the blade are particularly important.The damping performance of the blade is increased by applying a hard coating to the blade to reduce the deformation of the blade due to vibration and increase the life of the blade.In this paper,by sorting out and calculating the formulas of the composite beam,the motion equation of transverse vibration is derived from the bending strength of the composite beam when the composite beam is in stable bending vibration.The position of the center line of the composite beam is confirmed according to the brief geometric relation,and the complex bending stiffness of the composite beam is obtained by applying the theory of material mechanics,and then the dynamic equation of the composite beam is solved.Use SOLIDWORKS software to perform3 D modeling and ANSYS WORKBENCH simulation analysis on the overall engine impeller and coated blades.Obtain the first six-order mode cloud diagram and the harmonic response analysis origin line diagram in the range of 0-750 Hz.The vibration damping effect is most obvious when the thickness of the full coating on one side and the full coating on both sides is 10% of the thickness of the metal substrate.The aluminum oxide hard coating was sprayed on the stainless steel substrate by plasma spraying method.The characterized specimens were magnified by scanning electron microscopy（SEM）to 100 to 10,000 times for surface morphology analysis and energy spectrum analysis,and X-ray diffraction（XRD）was used to analyze the composition of the coating and determine the grain size,and it was concluded that the coating was aluminum oxide coating.The coating composition analysis and the determination of the grain size show that the coating is alumina coating.Use the measurement and control technology platform to measure the vibration displacement of the uncoated,25 m and 100 m thick aluminum oxide coatings,and measure the relationship between the voltage and the displacement of the coatings of different thicknesses.The relationship between the voltage and the displacement is measured through the sensor detection technology platform,and the relationship between the voltage and the displacement is calculated separately.The analysis results show that it is feasible to add alumina hard coating to engine blade to reduce vibration and increase damping.Through the simulation,different thickness of the coating will have a r-educed effect on the shape variable.The experimental results show th-at both 25μm and100μm alumina coatings have damping effect on the substrate,and the damping ratio increases with the increase of the coating thickness,and the damping ratio of 100μm alumina coating is the largest.The research content of this paper lays a foundation for the development and practical application of alumina hard coating in damping.