Spindle rotary position estimation for fast tool servo trajectory generation

被引：14
|
作者：
Lu, Xiaodong
Trumper, David L.
机构：
[1] Vancouver, BC V6T 1Z4
[2] Cambridge, MA 02139
来源：
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE | 2007年 / 47卷 / 09期
关键词：
spindle angle estimation; trajectory generation; fast tool servo; diamond turning;
D O I：
10.1016/j.ijmachtools.2006.08.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In diamond turning of non-rotationally symmetric surfaces, fast tool servo (FTS) trajectory is generated in real time based on the spindle rotation angle. Essentially, a digital rotary encoder updates its output (samples the spindle angle) at fixed rotary angle interval. In time domain, the encoder sampling frequency is different from that of the FTS control computer. Without proper spindle position estimation, this asynchronous nature between the encoder spatial sampling and the computer temporal sampling can cause significant amount of aliasing noise in the generated trajectory. In this paper, we first analyze this aliasing phenomenon using discrete-time signal processing theories. Based on this analysis, a spindle rotary position estimator is designed to improve both accuracy and resolution of the spindle angle feedback. Its effectiveness and the associated trajectory generation are experimentally verified in diamond turning of sinusoidal surfaces with uitra-FTS. (C) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1362 / 1367
页数：6
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