基于多目标区间优化算法的吸尘口结构优化

Structure optimization of vaccum nozzle based on interval multi⁃objective optimization algorithm

为了降低离地间隙变化对吸尘口结构优化的干扰,使优化模型在不同离地间隙下都具有较好的吸尘性能,以吸尘口挡板角度θ1、θ2、θ3为确定性变量、离地间隙d为不确定性变量,依次进行正交试验设计、两相流仿真和近似模型拟合,基于多目标区间优化算法得到最优参数组合为:θ1=29°、θ2=10°、θ3=21°。当离地间隙分别为8、10、12、14 mm时,优化模型的出口颗粒质量流量分别提高了6.33%、3.54%、2.02%、2.33%,进、出口压力损失分别降低了18.09%、16.14%、13.22%、14.29%。

In order to improve the performance of vacuum nozzle of dust,three structure parameters and an operating parameter were selected as the design variables,and 32 samples were obtained by using the orthogonal experimental design method. The discrete phase model was used to analyse the track of particles and the cubic response surface model was used to establish a prediction model,which is used to predict and evaluate the performance of vacuum nozzle. Based on the prediction model,an interval multi-objective optimization algorithm was adopted to search the optimal parameters. By adopting the optimized structure,when the ground clearances are 8 mm,10 mm,12 mm and 14 mm respectively,the outlet mass flows of particles are increased by 6.33%,3.54%,2.02% and 2.33% respectively,and the total pressure losses are reduced by 18.09%,16.14%,13.22% and 14.29% respectively. It indicates that the interval multiobjective optimization algorithm is useful for structure optimization of the vacuum nozzle of dust.