摘要
为优化水平定向钻扩孔器的形状以及尺寸,建立了扩孔器形状优化的数学模型。采用轴对称数值方法,将三维模型转化为二维模型,再采用弹性体边界元边界方法,精确计算扩孔器端面的扩张应力,在此基础上求得扩孔器工作过程中所受的阻力和阻力矩,并通过遗传算法,以阻力和阻力矩最小为优化目标函数,对扩孔器的形状、尺寸进行优化。优化结果表明:优化后的较之传统设计形状在阻力和阻力矩上有大幅度降低。
In order to optimize the shape and size of reamers,the mathematical model for shape optimization of reamers is established. Firstly, BEM can be used to accurately calculate the expanding stress at the tip of reamers,with regarding the soil medium as the elastomer. Then the resistance and resistance moment of reamers in the working process is solved for. Finally, by genetic algorithm ,the shape and size of reamers are optimized with minimizing resistance and resistance moment. Many examples indicate that, compared with conventional design,the resistance and resistance moment are decreased greatly after the optimization.
出处
《机械制造与自动化》
2010年第1期83-86,共4页
Machine Building & Automation
关键词
水平定向钻机
扩孔器
边界元
形状优化
遗传算法
horizontal directional drill
reamer
BEM
shape optimization
genetic algorithm
