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| m3_seminar:m3_seminar_2018:projects_ustutt:active_dummy_2018 [2018/05/16 17:58] – created oleksandr | m3_seminar:m3_seminar_2018:projects_ustutt:active_dummy_2018 [2018/07/04 11:45] (current) – stud_ustutt | ||
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| ====== Active Dummy-active muscle modelling with finite elements ====== | ====== Active Dummy-active muscle modelling with finite elements ====== | ||
| - | ^ Autors | Name Surname, Name Surname, Name Surname & Name Surname | + | ^ Autors | Daniela Wertenauer, Nadia Jäckle, Tobias Stöckerl, Eduardo Key | |
| ^ Betreuer | Oleksandr Martynenko | | ^ Betreuer | Oleksandr Martynenko | | ||
| ^ Bearbeitungsdauer | ca. 25 Stunden | | ^ Bearbeitungsdauer | ca. 25 Stunden | | ||
| ^ Präsentationstermin | ^ Präsentationstermin | ||
| - | <note tip> | + | ===== Introduction – initial question ===== |
| - | You can find more information following | + | Simulation techniques are widely used within all fields of engineering, |
| - | * Wiki page ** formatting **: [[https:// | + | This method |
| - | * Creation | + | In the following study, the method is used to simulate the acting forces on the human body during |
| - | </ | + | The initial question was to add muscles to the neck of the existing model and show how they influence the motion of the head during the crash. |
| - | ===== Introduction/ | + | ===== Materials |
| - | At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Temporibus autem quibusdam et aut officiis debitis aut rerum necessitatibus saepe eveniet ut et voluptates repudiandae sint et molestiae non recusandae. Itaque earum rerum hic tenetur | + | The software used for the simulation was LS-DYNA. For pre- and postprocessing LSPrePost was used. For calculation, the model was uploaded to the university server. |
| + | The basis model used for the study was offered by the University of Stuttgart. The model consisted of a passive dummy, where no muscles were implemented. In addition, the model was diagonally belted. The regarded timespan of the crash was 20ms. | ||
| + | |||
| + | ===== Simulations & Results ===== | ||
| + | First of all, the muscles had to be implemented in the model. It has been decided, that 4 anatomic aligned muscles in the neck should be implemented. These muscles need material properties, which were entered within the model, given values were used here. In order to place the muscles, every muscle needs two nodes within the model which define the endpoints of the muscle. In LSDYNA, | ||
| + | For all these muscles there are two different parameters, which can be varied to change the result of the simulation. The first one is the muscle activation curve, which defines how the muscle is activated over the time. The second one is the cross sectional area of the muscles, which defines the cross section of the muscles, and with this, its strength. | ||
| + | To compare the influence of the different parameters three different version of the model were created. The used parameters can be seen within the following table: | ||
| + | ^ Version 1: | Basic passive model without changes (Reference) | | ||
| + | ^ Version 2: | Active dummy with 2 muscles implemented | | ||
| + | | | - Full activation (time independent) | | ||
| + | | | - Cross sectional area: 0,075| | ||
| + | ^ Version 3.1/ | ||
| + | | | - Full activation (time independent) | | ||
| + | | | - Cross sectional area: 0,075 / 2 / 200 | | ||
| + | ^ Version 4: | Active dummy with 4 muscles, edited activation curve| | ||
| + | | | - Step up in activation after 0,02ms from 0 to 1 | | ||
| + | | | - Cross sectional area: 0,075 | | ||
| + | ^ Version 5: | Active dummy with 4 muscles, change in muscle nodes | | ||
| + | | | - Nodes attached differently (for 2 dorsal muscles) | | ||
| ===== Podcast ===== | ===== Podcast ===== | ||
| - | Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, | + | {{ : |
| - | ===== Summary | + | ===== Conclusion |
| - | At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Temporibus autem quibusdam et aut officiis debitis aut rerum necessitatibus saepe eveniet ut et voluptates repudiandae sint et molestiae non recusandae. Itaque earum rerum hic tenetur | + | As the results show, the added muscles do not have a significant influence on the crash-caused movement of the head during a crash. |
| + | This may be a viable result, as the muscles of the neck are not supposed to compensate such huge forces occurring during | ||
| ===== References ===== | ===== References ===== | ||
| - | - Bayer, A., Schmitt, S., Günther, M., Haeufle, D.F.B. (2017): The influence of biophysical muscle properties on simulating fast human arm movements. Computer Methods in Biomechanics and Biomedical Engineering 20(8), 11-24. https:// | + | |
| - | - Christensen, | + | |