Experimental Studies on Ultra-precision Positioning (2nd Report)

Development of Ultra Precision Machining with High Positioning Resolution

INSTRUCTIONS The technology for ultra-precision machining has been developed rapidly and steadily. In recent years, the demand for free form, complex and microscopic cutting has increased as a result of the need for highvalue-added fabrication for items such as high NA glass lenses, micro-grooves, diffractive aspheric lenses and other optical components. The ultra-precision machine for cutting ...

Model Reference Control for Ultra - High Precision Positioning Systems

MODEL REFERENCE CONTROL FOR ULTRA-HIGH PRECISION POSITIONING SYSTEMS by Lan Yu Due to the increasing demands of high-density semiconductors, molecular biology, optoelectronics, and MEMS/NEMS in the past decades, control of ultra-high precision positioning using piezoelectricity has become an important area because of its high displacement resolution, wide bandwidth, low power consumption, and p...

Ultra-wideband Methods for Ugv Positioning: Experimental and Simulation Results

U.S. Army RDECOM-TARDEC, in collaboration with Oakland University and JADI Inc., is currently conducting novel research devoted to obtain fine-grain (centimeter accuracy) indoor positioning for unmanned ground vehicle (UGV) navigation applications using Ultra-Wideband (UWB) technologies. This paper will present recent results from advanced closed-form solutions and analyses for positioning erro...

2nd Annual Report on Strees

Practical control method for ultra-precision positioning using a ballscrew mechanism

This paper describes a practical control method for nanometer level point-to-point positioning (PTP) using a conventional ballscrew mechanism. nominal characteristic trajectory following controller (NCTF controller) is used for the ultra-precision positioning. The controller design, which s comprised of a nominal characteristic trajectory (NCT) and a PI compensator, is free from exact modeling ...