Research On Wing Electro-impulse De-icing System Electromagnetic Force And De-icing Process Calculation Simulation

The Boeing 787,which starts a new era of the more electric aircraft(MEA),put forward new requirements of the de-icing system.MEA cancels the bleed air from the engine except the nacelle anti-icing,so the electric energy becomes the only possible way to the de-icing system of wings.The Electro-impulse de-icing(EIDI)system has the advantages of high efficiency,light weight,good maintainability,etc.,so that the system has been paid more and more attention on de-icing research.Using the combination of theory analysis,numerical simulation and experiments,this paper discusses the electromagnetic force,dynamic analysis,and the optimization analysis on the de-icing system of more electric aircraft.Specific contents and achievements are as follows:Firstly,an electric circuit simulation model has been built according to the working principle of electro-impulse,and the circuit of the electric-impulse is simulated.The discharge process of EIDI system has been studied by using the method of time domain analysis on current.Under the defined condition of the circuit parameters,the current response of the output of the electric circuit has been solved.The relationship between the impulse current and the circuit parameters is researched by changing the parameters of circuit.For the simulation of electromagnetic field,the output of the circuit is simulated.Secondly,the electromagnetic field anti shock model of the electro-impulse de-icing system is established by the finite element analysis software to simulate the electromagnetic field change and structure stress during system working period.Based on the given current excitation,transient distribution of current density and intensity of magnetization in the electromagnetic field is calculated by the Maxwell equation.Then the stress state of every finite element at every moment is further solved.The influence of the parameters of circuit,the turns of coil,the parameters of wire,the distance between the skin and the coil on the force on the skin is studied,also the relationship between the induced current density,the acceleration,the displacement and the position of the skin is analyzed.Moreover,based on the combination of normal stress and shear stress between skin and ice,de-icing finite element model on flat is developed.Analyze on the simulation results with different ice failure criterions are analyzed,the best fit ice failure criterion for apply to EIDI system is determined.Part of the skin is selected to be the corresponding structural dynamic geometric model.The stress state of every finite element at every moment is input to simulate the model boundary of the fixed condition.The related structural dynamic model is built to solute the accelerated speed and displacement distribution on the skin.The deicing effects and the influences of structure dynamic at different de-icing pulse load by changing are researched.The variation of pulse load is realized by changing the de-icing pulse peak load on the leading edge.Finally,the relationship between the input energy,the rate of de-icing and the structure has been determined.Based on the contrastive analysis on the rate of de-icing,the maximum equivalent stress of the skin and the maximum equivalent structural stress between double EIDI systems and four EIDI systems,the optimization results on relevant parameters are acquired.The concepts like the unit load of the rate of de-icing,the unit load of the maximum equivalent stress of the skin and the unit load of the maximum equivalent structural stress have been proposed.In order to determine the influence of the different strike time lag and the different peak load on the full structural,the simulation of muti-pulse strike mode on the edge of a wing has been studied.The research provides the design and optimize theory for the coil arrangement,logic control system and the rate of the de-icing of EIDI system.