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Investigations Regarding the Effects of Simulating Parameters During 3D Garments' Drape Simulations

Rudolf A., Zadravec M., Stjepanovič Z.

Fibres & Textiles in Eastern Europe

2016

Vol. 24, no. 6 (120)

143--150

This paper presents research into simulating parameters effects on 3D garment drape simulations with the aim of examining influential parameters regarding the accuracies of the appearances of virtual garments. The effects on the modified appearances of 3D virtual garments due to the simulated parameters, i.e. the solver setting, soft bending and resolution were investigated. Drape simulations of fabrics and garments were analysed by using the OptiTex 3D commercial CAD system for different fabrics, of which low-stress mechanical properties were measured by using the FAST measuring system and drape parameters by a Cusic Drape Tester. A comparison between the orthogonal projections of the real and virtual fabric drapes based on the Cusic method was performed and between the appearances and dimensions of the real and 3D virtual garments. The simulation parameters observed influence drape simulations of the 3D virtual fabrics and 3D garments depending on the fabric properties and pattern piece sizes. The results reveal that there is still a fundamental problem regarding the introduction of real fabric physical and seam properties during garment drape simulation. Therefore further consistent studies are needed for resolving limitations in this area on the synergistic effects of simulation parameters on 3D garment drape simulation.

Praca prezentuje badania symulacji efektów parametrów przestrzennej układalności ubioru i ich symulacji w celu sprawdzenia oddziaływania parametrów i dokładności uzyskanych wyników dla wirtualnych ubiorów w stosunku do rzeczywistych ubiorów. Badano układalność zarówno ubiorów jak i tkanin za pomocą komercyjnego systemu CAD OptiTex 3D. Parametry mechaniczne tkanin przy małych obciążeniach badano stosując system FAST, a parametry układalności za pomocą Cusic Drape Meter. Porównanie układalności pomiędzy ortogonalnymi rzutami rzeczywistych i wirtualnych tkanin przeprowadzono w oparciu o metodę Cusic. Wyniki badań wykazały, że w dalszym ciągu istnieje podstawowy problem odpowiedniej symulacji wszystkich realnych właściwości tkanin oraz ubiorów, w tym zastosowanych szwów.

Planar arm movement trajectory formation: an optimization based simulation study

Zadravec M., Matjačić Z.

Biocybernetics and Biomedical Engineering

2013

Vol. 33, no. 2

106--117

Rehabilitation of post stroke patients with upper extremity motor deficits is typically focused on relearning of motor abilities and functionalities requiring interaction with physiotherapists and/or rehabilitation robots. In a point-to-point movement training, the trajectories are usually arbitrarily determined without considering the motor impairment of the individual. In this paper, we used an optimal control model based on arm dynamics enabling also incorporation of muscle functioning constraints (i.e. simulation of muscle tightness) to find the optimal trajectories for planar arm reaching movements. First, we tested ability of the minimum joint torque cost function to replicate the trajectories obtained in previously published experimental trials done by neurologically intact subjects, and second, we predicted the optimal trajectories when muscle constraints were modeled. The resulting optimal trajectories show considerable similarity as compared to the experimental data, while on the other hand, the muscle constraints play a major role in determination of the optimal trajectories for stroke rehabilitation.