International Journal of Engineering Systems Modelling and Simulation
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International Journal of Engineering Systems Modelling and Simulation (4 papers in press)
Redesign and Evaluation of an Equation-Based Model Reduction Method in OpenModelica by Fatemeh Davoudi, Oliver Lenord, Niklas Worschech, Umut Durak, Sven Hartmann Abstract: Even in times of a continuously growing computational power and progressing miniaturization of computers and control devices, the demand for model reduction techniques persists. This is due to the intrinsic conflict between precision and performance of simulations in general. The trade-off between precision and performance depends on the purpose of the simulation as well as the runtime requirements of the target device. Detailed models of physical systems used in an early stage of the system design process typically result in rather complex dynamic models. In later stages of the design process, when the design space has been narrowed down to a concrete design, it is often desirable to replace these detailed models by simpler ones. The reduced models are expected to run multitudes faster while preserving important properties of the original model required for control design and validation purposes. Equation-based model order reduction is a promising approach to serve the needs. This paper presents a redesigned implementation of a equation-based model reduction method in the OpenModelica compiler. For evaluation purposes the reduction method is applied to a simple sample model (two mass spring damper). The performance of the generated reduced model and the cost of the reduction process are evaluated. The reduced model generated by the reduction algorithm is compared with the results of a theoretically derived reduced model. In the conclusions deficits of the current implementation are discussed. Proposals for further improvements of the implementation and enhancements of the methodology for extended control design use cases are given in the outlook. Keywords: model reduction; parametric model reduction; non-linear model reduction; proper model generation; Modelica; OpenModelica; residual ranking.
Finite element analysis of the vertical roller mill based on ANSYS Workbench by Weihua Wei, Yuantong Li, Hongwei Zhu, Peng Jin Abstract: By using of element analysis software ANSYS Workbench, the static analysis of lower rocker arm and column, and the modal analysis of column are carried out. The three-dimensional models of lower rocker arm and column were imported into the ANSYS Workbench for meshing. The loads and constraints were imposed on the meshed model to solve for the stress and deformation. The contour plots of stress and the total deformation of the lower rocker arm and column indicate that the structure meets the design requirements in strength and stiffness, which verifies the reliability of the structure. Through the modal analysis of column under free and constrained states, the first eight natural frequencies and vibration modals under free and constrained states are obtained, which can intuitively reflect the dynamic characteristics of the column itself, help to avoid structural resonances in engineering applications, and provide a theoretical basis for the optimization design and fault detection of the column. Keywords: vertical roller mill; lower rocker arm; column; static analysis; modal analysis; ANSYS Workbench.
Three-dimensional Image Reconstruction Method for Human maxillofacial defect images Based on Block Sample Feature Matching by Lingling Cui Abstract: In traditional methods, template matching of human face image sample and edge contour segmentation are ignored, and the application is susceptible to the robustness of skin color features and pose changes, resulting in poor accurate three-dimensional reconstruction and recognition of human maxillofacial defect images. Therefore a three-dimensional image reconstruction method for human maxillofacial defect images based on block sample feature matching is proposed. A feature matching template of human maxillofacial images is constructed, and template matching and three-dimensional edge contour segmentation are performed to the sample images through the blocking technique. The simulation results show that this method has good feature detection and detection ability in three-dimensional reconstruction of human maxillofacial defect images and can provide high accuracy in three-dimensional reconstruction. Keywords: Human maxillofacial defect; image; three-dimensional reconstruction; corner detection.
Stress and Deformation Analysis of A Reinforced Continuous Girder Bridge by Dongyu Ji, Xiaofen Li Abstract: In order to study the stress and deformation of reinforced concrete continuous beam bridge, numerical simulation analysis of reinforced concrete continuous girder bridge is carried by finite element method. The results show that, the tensile stress of the bridge deck generally appears in the lower part of the span and the upper part of the support, while the compressive stress generally appears in the upper part of the span and the lower part of the support; The displacement of bridge superstructure is larger than that of substructure and soil layer, the vertical deformation of the bridge is mainly caused by the gravity of the bridge. The research results provide some references for the design and construction of continuous girder bridge. Keywords: Box girder; Continuous girder bridge; Numerical simulation; Calculation model; Stress distribution.