CAJ | 학술논문

针对汽车车身局部修形传统气动减阻方法存在经验式和盲目性问题，以某款成熟简化实车发动机罩低阻曲面优化减阻为例，提出了基于硬点‐骨架约束的车身低阻曲面优化设计法．采用DOE（design of experiment）试验设计方法对发动机舱罩进行硬点采样，通过硬点‐骨架约束建立样本曲面．构建以硬点为设计因子，阻力系数为响应值的数学近似模型，并使用多岛遗传算法获得发动机舱罩理论最优解．计算表明：优化后的实车车模气动阻力减少3．32％，证明了硬点‐骨架约束在车身减阻上的可行性和有效性．
침대기차차신국부수형전통기동감조방법존재경험식화맹목성문제，이모관성숙간화실차발동궤조저조곡면우화감조위례，제출료기우경점‐골가약속적차신저조곡면우화설계법．채용DOE（design of experiment）시험설계방법대발동궤창조진행경점채양，통과경점‐골가약속건립양본곡면．구건이경점위설계인자，조력계수위향응치적수학근사모형，병사용다도유전산법획득발동궤창조이론최우해．계산표명：우화후적실차차모기동조력감소3．32％，증명료경점‐골가약속재차신감조상적가행성화유효성．
Aiming at car body using traditional methods of local modification aerodynamic drag reduc‐tion with experience ,blindness and other problems ,taking a ripe simplified real vehicle engine hood low resistance surface optimization of drag reduction for example ,the low resistance surface optimiza‐tion design method is put forward that based on hard‐skeleton constraints .Using design of experiment (for shot DOE) methods to sample the hard points of vehicle engine hood ,then the sample surface is established through a hard points‐skeleton .A mathematical approximation model of hard point is con‐structed as design factors and drag coefficients for response values .Taking advantage of multi‐island genetic algorithm to get engine hatch theory of optimalsolutions .the calculation show s that the opti‐mized real vehicle model aerodynamic drag is reduced by 3 .32% ,w hich proves that the feasibility and effectiveness of hard‐skeleton constraints in automobile body drag reduction .