基于正交试验设计方法优化仿生活塞结构参数

Optimization of Bionic Piston Structure Parameters Based on the Orthogonal Experiment Method

基于生物非光滑耐磨理论,仿照自然生物体表形态,在光滑标准泥浆泵活塞表面加工凹坑形仿生单元体可显著提高泥浆泵活塞的使用寿命.本文运用正交试验优化技术设计实验方案,以优化仿生活塞结构参数。通过对实验结果进行多元正交多项式回归分析,研究仿生活塞表面凹坑形结构参数对活塞寿命的影响规律.凹坑直径对BW-160型泥浆泵活塞寿命的影响最大,凹坑中心夹角的影响次之,影响最小的因素是凹坑深度.基于正交试验方法优化出的最优泥浆泵仿生活塞结构参数分别为：凹坑直径3mm,凹坑中心夹角10°,凹坑深度4mm.最优仿生活塞在实际现场钻井测试中,可提高活塞寿命1.2倍.

Based on the bionics, processing dimples shape bionic units on the standard smooth mud pump piston surface can improve the life-span of mud pump piston. Imitating natural biological surface morphology, we got the bionic units. Under the same experimental conditions, the test scheme is designed to optimize the structure parameters of the piston with the method of orthogonal experiment optimization design. The results show that dimples shape piston can obviously increase the life-span of the piston, and the dimples＇ diameter has a great influence on the life of piston. The second influence factor is dimples＇ center angle. The dimples＇ depth has little effect on the life span. Orthogonal polynomial optimization analysis results show that the optimal structural parameters of the dimples shape mud pump piston are the dimple diameter 3 mm, the dimple center angle is 10°,and the depth of dimples is 4 mm. In the actual drilling tests, the optimal bionic piston can improve the piston life 1.2 times.