Research On Optimization Of Laser Electrolysis Combined Micromachining Parameters Based On Neural Network

The film cooling hole technology of nickel base alloy blade with Thermal barrier coating can improve the performance and reliability of the engine.Laser electrolysis combined micro machining can solve the problems of microcracks and recast layers in traditional laser processing of gas film holes.The requirements for film cooling holes in aviation engines are very strict,and there are too many influencing parameters in processing.If the process parameters are not selected properly,it will not only lead to substandard quality of the film holes,but also cause defects inside the engine blades,causing serious impacts.Traditional optimization methods for machining parameters have drawbacks such as time-consuming and labor-intensive,and lack of systematicity.In recent years,people have increasingly tended to use artificial intelligence methods to solve these problems.This article introduces artificial intelligence technology and applies the combination of BP neural network and whale optimization algorithm in the study of parameter optimization in laser electrolytic combination machining.Firstly,a hybrid strategy is proposed to improve the whale optimization algorithm,including the introduction of Circle chaotic mapping,adaptive inertia weight strategy,and Levy flight strategy.Through experimental verification and comparison on 10standard functions,the results show that the optimization ability of the hybrid strategy improved Whale Optimization Algorithm（IWOA）has been improved.Secondly,two fusion methods of BP neural network and improved whale algorithm were designed:BP neural network optimization method based on improved whale algorithm and nonlinear function extremum optimization method based on neural network and improved whale algorithm.Finally,two fusion algorithms were used to model and optimize the electrolyte assisted nanosecond ultraviolet laser processing of Thermal barrier coating and small gap electrochemical processing of nickel based alloys in the combined processing,and the optimal processing parameters were obtained:laser power factor 773‰,laser pulse frequency 40k Hz,laser rotary cutting speed 14mm/s,and laser rotary cutting spacing21μm and current value 3.5A,pulse voltage 9V,pulse power frequency 8k Hz,pulse power duty cycle 67%,initial machining gap 51μm.Electrode feed rate 11μm·s^-1.Through the experimental results,the validity of the optimal machining parameters is verified,which has a certain guiding significance for the laser electrochemical combined machining of the gas film hole with Thermal barrier coating on the engine blade.