基于汽车行驶内外压差的门密封失效分析

Door Seal Failure Analysis Based on Internal and External Pressure Difference of Vehicle Driving Condition

摘要:

汽车内外空气压差随车速提高大幅增长，随之影响车辆密封，导致车门密封失效风险上升。车门密封失效后会产生强气吸噪声，破坏车内声品质。通过风洞实验和仿真计算获得不同车速及偏航角条件下的车门密封条内外压差分布，作为输入条件，分别对车门和门密封条进行有限元建模，综合考虑压差作用下车门变形和密封条变形，以密封条与车门钣金接触宽度为标的分析其失效情况。结果表明，车门变形及位移引起的密封条预压缩量减小是密封失效的主要原因。

Abstract:

The air pressure difference inside and outside the vehicle increases significantly with the increase of vehicle speed， which affects the vehicle seal and leads to an increase in the risk of door seal failure. Once the seal fails， it will produce a strong air suction noise which destroys the sound quality in the vehicle . In this paper， through wind tunnel experiments and simulations， the pressure difference distributions between both sides of the door seal at different vehicle speeds and yaw angles were obtained as input conditions. The finite element simulations of door and door sealing strip were conducted respectively. The door deformation and the sealing strip deformation under the action of the pressure difference were considered comprehensively， and the failure situation was analyzed based on the contact width of the sealing strip and the door sheet metal. The results show that the reduction of pre-compression of the sealing strip caused by door deformation and displacement is the main reason for seal failure.