摘要
针对非对称性销孔的镗削加工,研究了用于高负荷孔精密镗削装置的超磁致伸缩致动器（GMA）的相关控制。考虑GMA的迟滞非线性,分析了准静态改进型Prandtl-Ishlinskii（P-I）模型的数学机理;为提高其动态适用频域和控制精度,提出了结合相角前馈补偿的动态改进型P-I模型,获得了满意的控制效果。结合PID反馈控制搭建的闭环控制实验结果显示,GMA的迟滞非线性由补偿前的14.5%～67.2%减小到1.5%～4.3%,有效降低了迟滞系统的非线性误差。在此基础上进行了椭圆销孔试镗削实验,结果显示其椭圆度均符合图纸要求,验证了补偿方法的正确性。本文的研究为实现高负荷异形孔的精密加工提供了新方法。
For high precision machining of asymmetric boring holes,a control technology of the Giant Magnetostictive Actuator（GMA）used in a precision high-load pinhole boring device was explored.According to the hysteresis nonlinearity of the GMA,the mathematic mechanism of the quasi static modified Prandtl-Ishlinskii（P-I）model was analyzed briefly.To broaden the application frequency domain and to improve the precision of quasi static modified P-I model,a modified dynamic P-I model was proposed by combining with hysteresis phase feedforword compensation,and good control results were obtained.The experiment of back loop control system based on the dynamic modified P-I model and a PID controller was conducted.Results after compensation show that the hysteresis nonlinearity of GMA has reduced from 14.5%-67.2% to 1.5%-4.3% at the case of open loop control,which controls the nonlinear error of the hysteresis.Moreover,a boring experiment for an oval pin hole was performed,the obtained ovality accords with the requirement of drawings,and verifies the feasibility of the proposed method.The research in this paper provides a new method for machining high-load oval pinholes.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2016年第6期1389-1398,共10页
Optics and Precision Engineering
