Equivalent-plane cross-coupling control method

US10921772B2 · kind B2 · utility

Assignee

• Dalian University of Technology · CN

Inventors

• Jianwei Ma · Dalian, CN
• Zhenyuan JIA · 东风镇, CN
• Dening Song · Dalian, CN
• Fuji Wang · 东风镇, CN
• Wei Liu · Lo Wu, CN
• Ning Zhang · Saratoga, US
• Siyu Chen · Beijing, CN
• Guangzhi He · Dalian, CN

Key dates

• Filing date: Jan 7, 2018
• Grant date: Feb 16, 2021
• Expiry date: May 10, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/33099
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The invented equivalent-plane cross-coupling control method belongs to high-precision and high-efficiency intelligent multi-axis CNC (Computer Numerical Control) machining filed, featured a three-axis cross-coupling controller based on the equivalent plane which can be used for improvement of the three-dimensional contour-following accuracy. This method first find the foot point from the actual motion position to the desired contour using a tangential back stepping based Newton method. Then, establish an equivalent plane which containing the spatial contouring-error vector by passing through the actual motion position and the tangential line at the foot point. After that, estimate the three-dimensional contouring error in a scalar form, thus controlling the signed error using a PID based two-axis cross-coupling controller. Finally, calculate the three-axis control signals according to the geometry of the equivalent plane, thus realizing the three-axis contouring-error control by using the well-studied two-axis contour controllers.