Arc Length Tracking Control for Blade MPAW Repair Based on Arc Pressure Feedback
In the process of micro-plasma additive repair of damaged aero-engine turbine blades,uneven surface of the cladding layer after multi-layer surfacing leads to formation of bulge morphology,which makes the surface to be repaired and the upper surface of the cladding layer have poor consistency.An arc length tracking control method based on arc pressure feedback was proposed to improve the arc length stability and solve the above problem.The arc voltage signal was used to indirectly characterize the arc length,and the algorithm which combines the variational mode decomposition and median average filtering was proposed to remove the noise signal.On this basis,a controller composed of variable universe fuzzy PID and PID was designed to adjust the height of the welding torch to achieve arc pressure stability,and the simulation optimization was carried out.Finally,a platform for arc voltage acquisition and arc length control was built to conduct the experiments of arc voltage signal denoising and welding for specimen with bulge.The results show that this method can significantly improve the stability of arc length,and the convex surface is consistent with surface the upper surface of cladding layer.
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