O-ring Airtightness Analysis of Key Components of a Certain Type of Aircraft Hatch Cover
The reason for the abnormal ejection of the actuator cylinder of an aircraft hatch cover is that the oil contains gas,which leads to the decrease of the volumetric modulus of elasticity of the oil,the increase of compressibility,and the easy occurrence of the ejection phenomenon,and the relationship between the gas content and the volumetric modulus of elasticity of the oil is obtained based on the IFAS model.The sealing area of the hydraulic maneuvering system of the hatch cover is sealed by O-ring,but the existence of rough surface features of the key components constitutes a gas leakage channel,which leads to the mixing of gas in the hydraulic maneuvering system of the hatch cover.Therefore,this paper proposes a leakage rate calculation method based on the Roth model,in which the contact relationship between the O-ring and the metal rough surface is regarded as the contact relationship between the elastic metal smooth surface and the rigid metal rough surface,and the triangular peaks of the metal roughness surface contour are arranged in a homogeneous manner,so that the leakage path is defined as a trapezoidal channel.Based on the finite element software ABAQUS,the sealing performance coefficient of the seal is calculated,and the effects of surface roughness as well as bias loading condition on the gas leakage rate are analyzed,and finally,the results are compared with the theoretical results by ANSYS simulation analysis.This work has important guiding significance for the design of high-precision seal structure processing.
万方数据
维普
