某乘用车复合材料发动机底护板变形问题优化

Optimization Of Deformation Of Composite Engine Under-Hood Panels

为了解决发动机底护板存在变形问题,以某款乘用车车型开发为研究对象,首先采用横向对标发现底护板刚度不足,通过增加加强筋及翻边结构,使刚度平均提升10 N/mm;其次通过CFD数值模拟分析发现发动机底护板高温区分布面积大、存在热变形现象。仿真结果表明:优化后方案平均温度为50℃,且较之前平均温度降低13℃,此优化方案可以有效地降低发动机底护板的表面温度。研究结果表明:增加加强筋及翻边结构有效地提升底护板的抗变形能力,并且增加排气口较好地解决高温变形问题,该研究方法提升了自主研发能力,为后续车型的开发提供了强有力理论支撑。

In order to solve the deformation problem of the engine bottom guard plate,taking the development of a certain passenger car model as the research object.Firstly,it was found that the rigidity of the bottom guard plate was insufficient by horizontal benchmarking.Secondly,through CFD numerical simulation analysisit is found that the distribution area of the high temperature area of the engine bottom guard plate is large and there is thermal deformation.The simulation results show that the average temperature of the optimized scheme is 50℃,which is 13℃lower than the previous average temperature.This optimization scheme can effectively reduce the surface temperature of the engine bottom shield.The research results show that adding reinforcing ribs and flanging structures can effectively improve the deformation resistance of the bottom guard,and adding exhaust ports can better solve the problem of high temperature deformation and pr ovide strong theoretical support.