Causes of Error for Turbine Radial Palette Measurement

Abstract

This paper describes the project of an optical measurement system, an evolution of the system currently installed on the lathe for turbine palettes refinement in Ansaldo Energie, developed by the Politecnico di Milano. This article analyzes the most significant causes of errors found in designing an optical measurement system, proposing improvements that can optimize the system, both in terms of performance and reliability. The idea behind this work is to develop a system that can measure with an accuracy of $10\\ \\mu\\mathrm{m}$ the difference of length of palettes of a turbine stadium in real time, while the turbine is turning on a refinement lathe.