Work

Uncertainty Evaluation of CMM and Optical 3D Scanning in Centrifugal Rotor Inspection

Year: 2026

Type: article

Abstract: Dimensional verification of turbomachinery rotors requires traceable accuracy on functional data and dense coverage of freeform blades. This study quantifies the expanded measurement uncertainty (U95) for a centrifugal rotor inspected with a bridge-type CMM (Nikon Altera 10.10.8) and a structured-light scanner (ATOS Compact Scan 5M Rev.1), using repeated measurements in accordance with ISO 10360 and ISO 15530-3. The CMM achieved U95 ≈ 4–6 µm on bores, whereas optical scanning yielded U95 ≈ 12–18 µm on freeform blade regions. Cross-system results exhibited systematic offsets, indicating that the two methods are not directly interchangeable in absolute terms. Nevertheless, they are complementary: CMM ensures datum traceability, while optical scanning enables rapid full-field blade assessment, supporting uncertainty-aware hybrid inspection.

Source: Metrology

DOI: 10.3390/metrology6010012

Authors: Ionuț-Alin Dumitrache, Andrei George Totu, Ana-Maria Dumitrache, Mihai Vlăduț

Institutions: Romanian Research and Development Institute for Gas Turbines, Universitatea Națională de Știință și Tehnologie Politehnica București

Language: English

Topic: Advanced Measurement and Metrology Techniques

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,207

Funder: Ministerul Cercetării, Inovării şi Digitalizării