Triaxial Fast Tool Servo Using Hybrid Electromagnetic–Piezoelectric Actuation for Diamond Turning

Design and Control of a Piezo-based Fast Tool Servo System for Precision Diamond Turning

A novel fast tool servo driven by piezoelectric actuator for precision diamond turning is designed in this paper. To overcome the inherent hysteresis and drift nonlinearity effect of the piezoelectric actuator, a closed-loop control system is established using strain gauge integrated in the actuator for position feedback, which has compact structure and can avoid interference in the machining. ...

Fabrication of Micro-Optical Devices Using Slow Tool Servo Diamond Turning Process

Micro-optical devices, e.g., micro lenses, micro mirrors, play an important role in high speed data, voice and video signal transmissions. In this study, a new method of fabricating micro optical devices was investigated. The method is different from traditional fabrication processes in the sense that that the micro optical elements were simultaneously machined in a process known as slow tool s...

Fabrication of Micro and Diffractive Optical Devices by Use of Slow Tool Servo Diamond Turning Process

In recent years it has become possible to fabricate freeform optics using multi-axes ultraprecision machines. Unlike conventional process where a single diamond tool is used to machine each individual lens one at a time, this research demonstrates the development of an innovative diamond tool trajectory which allows the entire microlens array or diffractive lens to be machined in a single opera...

A Simple and Fast Method for Field Calibration of Triaxial Gyroscope by using Accelerometer

Reliability Analysis of Aircraft Servo-Actuation Systems Using Evidential Networks

Servo-actuation system is one of the key executing subsystems of the flight control system of an aircraft. With the development of fly-by-wire control systems, redundant servo-actuation systems have been extensively applied. A servo-actuation system has a long life and high reliability, which results in the lack of failure information. In the mean time, available data is insufficient and imprec...