Contact Modeling with OpenSim: a User’s Approach

This project presents step-by-step tutorials on how to integrate contact elements within a OpenSim model. Contact modeling is performed by editing two *.osim files. The first tutorial covers the classic model of a bouncing sphere on an even plane (two cases will be considered: pure elastic contact; and dissipative contact). The second tutorial considers multiple contact interactions between a sphere, an ellipsoid and a plane. Contact forces are described with the Hunt & Crossley and the Elastic Foundation models. No friction forces are applied. The main motivation of this project is to provide easy to follow tutorials for contact modeling in OpenSim, therefore, complementing the current documentation on this topic. Musculoskeletal modelers or computational researchers that wish to incorporate surface contact elements within a multibody model will find this project of their interest.<a href="https://www.youtube.com/embed/BeOzPwoz1nk?version=3&hl=pt_PT">https://www.youtube.com/embed/BeOzPwoz1nk?version=3&hl=pt_PT</a> <br/><br/>This project includes the following software/data packages: <br/> <ul> <li> <a href="https://simtk.org/frs?group_id=735#pack_1198">contact_modeling_osim </a> : Step-by-step tutorials with OpenSim models, geometries and code. </li> </ul>

本项目呈现了在 OpenSim 模型中集成接触元素的操作步骤教程。接触建模通过编辑两个 *.osim 文件实现。第一篇教程涵盖了经典模型——球体在平坦表面上的弹跳（将考虑两种情况：纯弹性接触；以及耗散接触）。第二篇教程则探讨了球体、椭球体和平面之间的多重接触相互作用。接触力采用 Hunt & Crossley 模型以及弹性基础模型进行描述，未施加摩擦力。本项目的核心动机在于提供易于遵循的接触建模教程，从而补充当前关于此主题的文档。对于希望将表面接触元素纳入多体模型的肌肉骨骼模型构建者或计算研究人员而言，本项目将具有极大的吸引力。<a href="https://www.youtube.com/embed/BeOzPwoz1nk?version=3&hl=pt_PT">观看教程视频</a><br/><br>本项目包含以下软件/数据包：<br/><ul> <li><a href="https://simtk.org/frs?group_id=735#pack_1198">contact_modeling_osim</a>：包含 OpenSim 模型、几何形状和代码的逐步教程。</li> </ul>