基于响应面法的内燃机曲轴优化

针对内燃机曲轴的结构强度问题,以内燃机实际运行工况下整体曲轴有限元仿真为基础,通过中心组合试验方法进行采样,运用最小二乘法、显著性分析和拟合精度检测,构建并修正了曲轴结构强度计算的响应面模型,选择关键几何结构参数为设计变量,采用模拟退火与直接搜索相结合的协同优化方法对响应面模型进行优化。对某内燃机曲轴的优化算例表明,该优化方法能大大提高曲轴设计的优化效率,具有较高的精度。

Optimization of Internal Combustion Engine Crankshaft Based on Response Surface Method

To improve the structural strength of internal combustion engine crankshaft,the response surface model of crank-shaft structural strength was established and corrected by using least square method,significance analysis and fitting accuracy test based on the finite element simulation of whole crankshaft in real operating conditions of internal combustion engine.Sam-pling was conducted through the central composite design test method.The response surface model was optimized by using the combination of simulated annealing and direct Hooke-Jeeve search algorithm while certain key structural dimensions of crank-shaft were taken as the design variables.Optimization of a certain internal combustion engine crankshaft was carried out.The results showed that the proposed method could greatly improve the optimization efficiency of crankshaft design and as well had high accuracy.