Key Performance And Molding Process Of Rubber Sealing Structure For Aviation

Aerial rubber sealing structure is the key component of the airliner for the sealing of cabin and the motion of mechanism.The performance of the rubber sealing structure directly determines the safety and reliability of the aircraft.Because of the complex structure,the harsh working environment and high reliability of the aerial rubber sealing structure,the performance of friction,sealing in working conditions and molding process of the aerial rubber seal are the urgent scientific problems to be solved.Therefore,some innovative research works about the mechanical,the frictional and the sealing performance and the molding process of rubber sealing structure are carried out as follows:First,the stick-slip motion models of the aerial tubular rubber seals are established which indicated the stick-slip mechanism of the tubular rubber seal.The influences of the sliding velocity and the compressive displacement on the stick-slip motion are also studied by experiment.The friction analysis model of the fabric tubular rubber seal based on finite element method is also established to analyze the relationship between the friction behavior of the fabric rubber material and the tubular rubber seal structure.The impact factor of the friction performance on the driving torque when the tubular fabric rubber seal transmits the torque from one curved surface to the other.Second,the gas leakage model based on micro-channel of the contact interface between the fabric rubber material and metal material is proposed.The gas leakage rate of the contact interface for different contact stress is predicted by combining finite element method and computational fluid dynamics.The method of the gas leakage prediction of the tubular fabric rubber seal is proposed to analyze the gas leakage rate of the tubular fabric rubber seal for different pressure difference.The gas leakage testing platform for tubular fabric rubber seal is also built to study the effects of pressure on the gas leakage rate.The results from experiment show good agreement with the prediction results from the micro-channel model.Then,the effects of the diameter of the doorframe and the rubber sealing structure on the contact stress,the contact area and the leakage rate are studied based on the leakage model of the tubular fabric rubber seal.The method to predict the gas leakagerate of the cargo door is proposed to analyze the gas leakage rate of the cargo door on the airliner from takeoff to cruise by numerical analysis.Finally,the rubber vulcanization kinetics model is established to analyze the vulcanization molding process of the tubular fabric rubber seals and the tubular pure rubber seals numerically.The forming process in two steps and the evaluation methodology of the fabric rubber are proposed based on the rubber coated fabric.The relationship between the interfacial adhesive strength and the cure degree of rubber substrate are studied by experiment.The door seal of the airliner forming in one step and two steps are proposed based on the analysis of the vulcanization molding process and the experimental results.The research provides reliable experimental data and theoretical support on the mechanical designing,frictional mechanism,sealing structure evaluation and the rubber seal molding for the sealing structure of the airliner C919.