Dynamics model of active fixturing systems for thin-walled parts under moving loads

摘要

This work presents a modelling approach that captures the dynamic response of active fixture elements and thin-walled workpieces subjected to dynamic moving loads. The impedance coupling method is deployed to achieve the integration of analytical expressions for the active elements and a discretised finite element-based model of a workpiece. The proposed model is validated experimentally and analytically via a test case, involving a single active fixture element in contact with a thin aluminium plate subjected to an evenly distributed dynamic moving load. A very good agreement is observed between the time response of the modelled and the experimental system to step and harmonic inputs. The moving load modelling approach presents a maximum error of ∈ = 5.82% in terms of predicting the dynamic elastic deformation of the work-piece in comparison to an analytical model.