An Intelligent Non-Collocated Control Strategy for Ball-Screw Feed Drives with Dynamic Variations  

作　　者：Hui Liu Jun Zhang Wanhua Zhao 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering, Xi'an fiaotung University. Xi'an 710054, China [2]Collaborative Innovation Center of High-End Manufacturing Equipment, Xi'an fiaotong University, Xi'an 710054, China

出　　处：《Engineering》2017年第5期641-647,共7页工程（英文）

基　　金：This work was supported by the key project of the National Natural Science Foundation of China （51235009）.

摘　　要：The ball-screw feed drive has varying high-order dynamic characteristics due to flexibilities of the slender screw spindle and joints between components, and an obvious feature of non-collocated control when a direct position measurement using a linear＇scale is employed. The dynamic characteristics and non- collocated situation have long been the source of difficulties in motion and vibration control, and deterio- rate the achieved accuracy of the axis motion. In this study, a dynamic model using a frequency-based sub- structure approach is established, considering the flexibilities and their variation. The position-dependent variation of the dynamic characteristics is then fully investigated. A corresponding control strategy, which is composed of a modal characteristic modifier （MCM） and an intelligent adaptive tuning algorithm （ATA）, is then developed. The MCM utilizes a combination of peak filters and notch filters, thereby shaping the plant dynamics into a virtual collocated system and avoiding control spillover. An ATA using an artificial neural network （ANN） as a smooth parameter interpolator updates the parameters of the filters in real time in order to cope with the feed drive＇s dynamic variation. Numerical verification of the effectiveness and robustness of the orooosed strategy is shown for a real feed drive.

关 键 词：Ball-screw feed drives Varying high-order dynamics Non-collocated control Modal characteristic modifier Intelligent adaptive tuning algorithm 

分 类 号：N[自然科学总论]