Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Mechanical Engineering, Turkey
Approval Date: 2022
Thesis Language: English
Student: BARIŞ ALTUN
Principal Supervisor (For Co-Supervisor Theses): Hakan Çalışkan
Co-Supervisor: Orkun Özşahin
Abstract:
Frequency Response Functions (FRFs) are utilized for
analyzing vibrations created during milling process. FRFs obtained with
external excitations are often not sufficient as machine-tool dynamics are
position-dependent (to machine-tool axes, workpiece placement) and frequency
domain to be identified requires specialized equipment. In this thesis, an
identification method based on operational excitation addressing these problems
is proposed. A single rectangular workpiece is processed and acceleration
measurements are taken. FRF is calculated according to the proposed method of
sampling engagements individually and force calculation based on mechanistic
models. Results are compared with tap test results. Force coefficients to be
used are identified by tap tests obtained from a different spot and mechanistic
force model by processing a similar rectangular workpiece. Results are
confirmed with FRF obtained in the same location.