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arXiv 2110.00541cs.RO
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验证机器人模拟器对现实世界的影响

Validating Robotics Simulators on Real-World Impacts

University of Pennsylvania(宾夕法尼亚大学)

Brian Acosta, William Yang, Michael Posa

摘要:

逼真的仿真环境是每个机器人专家工具包中的重要工具,其用途从规划和控制到强化学习的训练策略。尽管仿真在现代机器人技术中处于中心地位,但很少有人将机器人仿真器的性能与真实世界的数据进行比较,特别是对于涉及高速冲击事件的动态运动的场景。处理动态接触是大多数模拟的计算瓶颈,因此围绕冲击和摩擦的建模和算法选择形成了流行工具之间的最大区别。在这里,我们评估的能力,几个模拟器再现现实世界的轨迹,涉及影响。使用实验数据,我们确定流行的模拟器德雷克,MuJoCo和子弹系统特定的接触参数,分析这些参数周围的建模选择的影响。举一个简单的例子,把一个立方体扔到桌子上,模拟器可以很好地捕捉非弹性冲击,但无法捕捉弹性冲击。对于Cassie从跳跃中着陆的高维情况,模拟器很好地捕捉了大量运动,但准确性受到真实机器人和模拟器之间众多模型差异的限制。

英文摘要:

A realistic simulation environment is an essential tool in every roboticist's toolkit, with uses ranging from planning and control to training policies with reinforcement learning. Despite the centrality of simulation in modern robotics, little work has been done to compare the performance of robotics simulators against real-world data, especially for scenarios involving dynamic motions with high speed impact events. Handling dynamic contact is the computational bottleneck for most simulations, and thus the modeling and algorithmic choices surrounding impacts and friction form the largest distinctions between popular tools. Here, we evaluate the ability of several simulators to reproduce real-world trajectories involving impacts. Using experimental data, we identify system-specific contact parameters of popular simulators Drake, MuJoCo, and Bullet, analyzing the effects of modeling choices around these parameters. For the simple example of a cube tossed onto a table, simulators capture inelastic impacts well while failing to capture elastic impacts. For the higher-dimensional case of a Cassie biped landing from a jump, the simulators capture the bulk motion well but the accuracy is limited by numerous model differences between the real robot and the simulators.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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