Jos Havinga
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View article: Radial basis function interpolation of fields resulting from nonlinear simulations
Radial basis function interpolation of fields resulting from nonlinear simulations Open
Three approaches for construction of a surrogate model of a result field consisting of multiple physical quantities are presented. The first approach uses direct interpolation of the result space on the input space. In the second and third…
View article: Asymptotic Homogenization in the Determination of Effective Intrinsic Magnetic Properties of Composites
Asymptotic Homogenization in the Determination of Effective Intrinsic Magnetic Properties of Composites Open
We present a computational framework for two-scale asymptotic homogenization to determine the intrinsic magnetic permeability of composites. To this end, considering linear magnetostatics, both vector and scalar potential formulations are …
View article: Discontinuous Galerkin FEM with Hot Element Addition for the Thermal Simulation of Additive Manufacturing
Discontinuous Galerkin FEM with Hot Element Addition for the Thermal Simulation of Additive Manufacturing Open
Despite its promising advantages, the application of directed energy deposition (DED) to produce large metal parts is hindered by challenges inherent to the process. Undesired residual stresses, distortions and heterogeneous material prope…
View article: Estimation of the Effective Magnetic Properties of Two-Phase Steels
Estimation of the Effective Magnetic Properties of Two-Phase Steels Open
We investigate the predictive performance of specific analytical and numerical methods to determine the effective magnetic properties of two-phase steels at the macroscale. We utilize various mixture rules reported in the literature for th…
View article: Evaluation of POD based surrogate models of fields resulting from nonlinear FEM simulations
Evaluation of POD based surrogate models of fields resulting from nonlinear FEM simulations Open
Surrogate modelling is a powerful tool to replace computationally expensive nonlinear numerical simulations, with fast representations thereof, for inverse analysis, model-based control or optimization. For some problems, it is required th…
View article: Process Linearization for Closed-Loop Control of Incremental Sheet Forming
Process Linearization for Closed-Loop Control of Incremental Sheet Forming Open
Incremental sheet forming has, despite its great flexibility, not yet been widely adopted by the forming industry, due to its limited geometric accuracy. One of the approaches to overcome this problem is the development of closed-loop cont…
View article: Bayesian Model-based State Estimation for Mass Production Metal Forming
Bayesian Model-based State Estimation for Mass Production Metal Forming Open
Modern metal forming factories produce large amounts of data, such as process forces and product geometries. These data contain indirect information about fluctuations in the manufacturing process, such as changes in temperature, material …
View article: Exploiting data in smart factories: real-time state estimation and model improvement in metal forming mass production
Exploiting data in smart factories: real-time state estimation and model improvement in metal forming mass production Open
Modern production systems have numerous sensors that produce large amounts of data. This data can be exploited in many ways, from providing insight into the manufacturing process to facilitating automated decision making. These opportuniti…
View article: Control of ring rolling with variable thickness and curvature
Control of ring rolling with variable thickness and curvature Open
Radial-Axial Ring Rolling (RARR) is an industrial forging process for making strong, seamless metal rings. Conventionally, rings are made circular with constant cross-section. In this work we demonstrate a sensing and control strategy to c…
View article: Sequential improvement for robust optimization using an uncertainty measure for radial basis functions
Sequential improvement for robust optimization using an uncertainty measure for radial basis functions Open
The performance of the sequential metamodel based optimization procedure depends strongly on the chosen building blocks for the algorithm, such as the used metamodeling method and sequential improvement criterion. In this study, the effect…
View article: Optimization and control of metal forming processes
Optimization and control of metal forming processes Open
Inevitable variations in process and material properties limit the accuracy of metal forming processes. Robust optimization methods or control systems can be used to improve the production accuracy. Robust optimization methods are used to …