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research-article

Frequency Domain Prediction of Varying Thin-Walled Workpiece Dynamics in Machining

[+] Author and Article Information
Oguzhan Tuysuz

PhD Candidate ASME Student Member The University of British Columbia Department of Mechanical Engineering Manufacturing Automation Laboratory (MAL) 2054-6250 Applied Science Lane Vancouver BC V6T 1Z4 Canada
oguzhan.tuysuz@alumni.ubc.ca

Yusuf Altintas

Professor Fellow ASME The University of British Columbia Department of Mechanical Engineering Manufacturing Automation Laboratory (MAL) 2054-6250 Applied Science Lane Vancouver BC V6T 1Z4 Canada
altintas@mech.ubc.ca

1Corresponding author.

ASME doi:10.1115/1.4036124 History: Received October 16, 2016; Revised February 20, 2017

Abstract

The structural dynamics of thin-walled parts vary as the material is removed during machining. This paper presents a new, computationally efficient reduced order dynamic substructuring method to predict the frequency response function (FRF) of the workpiece as the material is removed along the toolpath. The contribution of the removed mass to the dynamics of the workpiece is cancelled by adding a fictitious substructure having the opposite dynamics of the removed material. The equations of motion of the workpiece are updated, and workpiece FRFs are evaluated by solving the hybrid set of assembled equations of motion in frequency domain as the tool removes the material between two consecutive dynamics update steps. The orders of the initial workpiece structure and the removed substructures are reduced using a model order reduction method with a newly introduced automatic master set selection criterion. Both the full and reduced order FRF update models are validated with peripheral milling tests and FRF measurements on a plate-shaped workpiece.

Copyright (c) 2017 by ASME
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