%0 Journal Article
%T 基于凹坑型非光滑结构的车身气动减阻优化方法研究<br>Optimizing Strategy on Car Body Aerodynamic Drag Reduction Based on Pit-type Non-smooth Structure
%A 杨易
%A 许亮
%A 聂云
%A 徐永康
%J 机械科学与技术
%D 2015
%X 采用了梯度优化法和全局优化法对凹坑型非光滑单元进行优化设计,寻求非光滑单元对汽车的最佳气动减阻效果。将凹坑型非光滑结构布置在某款集装箱货车模型的不同位置,比较减阻效果差异,确定了模型的有效减阻位置。以凹坑单元体开口直径、深度、纵向间距、横向间距为设计变量,分别采用梯度优化法和全局优化法优化凹坑型非光滑结构,比较了两种方法的差异。结果表明:梯度优化法可以快速得到适用于工程实际的优化方案;全局优化法考虑到了变量的耦合因素,优化结果更加全面、准确;经过优化,凹坑型非光滑结构可有效减小气动阻力达10.44%。<br>This paper uses gradient optimization method and global optimization method to optimize the design of the pit-type non-smooth unit, seeking the best drag reduction effect on the car body by adding non-smooth structures. The pit-type non-smooth structure is arranged on different locations of a container truck model, the difference in drag reduction effect is compared to determine the effective drag reduction position of the model. The pit-type non-smooth structure's design variables of aperture diameter, depth, vertical spacing, and horizontal spacing were optimized using the gradient method and the global optimization method respectively; the differences between the two methods were compared. The results and their discussion show preliminarily that: the gradient method can quickly obtain optimization program for practical engineering; global optimization method takes the variable coupling factor into account and its optimization results are more comprehensive and accurate; after optimization, pit-type non-smooth structure can effectively reduce the aerodynamic drag up to 10.44%
%K 非光滑单元
%K 气动减阻
%K 设计变量
%K 优化&lt
%K br&gt
%K aerodynamic drag
%K automobiles
%K boundary conditions
%K calculations
%K computational fluid dynamics
%K computer simulation
%K computer software
%K design
%K drag reduction
%K efficiency
%K flow fields
%K flow velocity
%K global optimization
%K gradient methods
%K mesh generation
%K optimization
%K schematic diagrams
%K trucks
%K turbulence models
%K Non-smooth surface
%U http://journals.nwpu.edu.cn/jxkxyjs/CN/abstract/abstract6250.shtml