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• W3129060003 startingPage "102134" @default.
• W3129060003 abstract "• A hybrid model to predict the pose-dependent FRF of industrial robots was developed • Experimental Modal Analysis was conducted to calibrate a data-driven model • Operational Modal Analysis was performed from milling data to update the model • The hybrid model combining EMA and OMA was shown to improve calibration efficiency Models that predict the Frequency Response Function (FRF) of six degree-of-freedom (6-dof) industrial robots used for machining operations such as milling are usually built using Experimental Modal Analysis (EMA) of vibration data obtained from modal impact hammer tests performed at a finite number of points in the robot's workspace corresponding to specific arm configurations. While modal impact hammer tests are not constrained by the operating conditions of the robot, such as specific arm configurations allowed by part fixturing, they are limited by the number of workspace points that can be practically sampled and the associated robot downtime. Alternatively, the process of determining robot FRFs from on-line machining process data (e.g., forces and vibration) through Operational Modal Analysis (OMA) enables a denser sampling of the robot's workspace without requiring robot downtime. However, OMA may require several long tool paths and one or more complex part setups to enable sampling of a sufficiently large number of locations/arm configurations. This paper presents an efficient hybrid statistical modelling methodology that combines the two approaches, thus enabling possible optimization of sampling density and robot downtime, to efficiently determine the robot FRFs as a function arm configuration. The approach consists of first calibrating a Gaussian Process Regression (GPR) model with FRF data derived from EMA conducted at a small number of discrete locations in the robot's workspace. Then, FRFs calculated from OMA of milling forces and tool tip vibration data derived from robotic milling tests are used to update the initial GPR model using Bayesian inference and efficient hyperparameter updating. The proposed hybrid robot FRF modelling method is experimentally validated and shown to yield accurate predictions of the robot FRF while being computationally efficient." @default.
• W3129060003 created "2021-02-15" @default.
• W3129060003 creator A5065436865 @default.
• W3129060003 creator A5075529785 @default.
• W3129060003 date "2021-08-01" @default.
• W3129060003 modified "2023-10-12" @default.
• W3129060003 title "Hybrid statistical modelling of the frequency response function of industrial robots" @default.
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• W3129060003 doi "https://doi.org/10.1016/j.rcim.2021.102134" @default.
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