Extending Lagrangian and Hamiltonian Neural Networks with Differentiable Contact Models
Extending Lagrangian and Hamiltonian Neural Networks with Differentiable Contact Models
复制标题
用可微接触模型扩展拉格朗日和哈密顿神经网络
DOI:
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Amit Chakraborty
中科院分区:
文献类型:
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作者:
Yaofeng Desmond Zhong;Biswadip Dey;Amit Chakraborty
The incorporation of appropriate inductive bias plays a critical role in learning dynamics from data. A growing body of work has been exploring ways to enforce energy conservation in the learned dynamics by encoding Lagrangian or Hamiltonian dynamics into the neural network architecture. These existing approaches are based on differential equations, which do not allow discontinuity in the states and thereby limit the class of systems one can learn. However, in reality, most physical systems, such as legged robots and robotic manipulators, involve contacts and collisions, which introduce discontinuities in the states. In this paper, we introduce a differentiable contact model, which can capture contact mechanics: frictionless/frictional, as well as elastic/inelastic. This model can also accommodate inequality constraints, such as limits on the joint angles. The proposed contact model extends the scope of Lagrangian and Hamiltonian neural networks by allowing simultaneous learning of contact and system properties. We demonstrate this framework on a series of challenging 2D and 3D physical systems with different coefficients of restitution and friction. The learned dynamics can be used as a differentiable physics simulator for downstream gradient-based optimization tasks, such as planning and control.
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DOI:
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发表时间:
2020-06
期刊:
ArXiv
影响因子:
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作者:
Shuqi Yang;Xingzhe He;Bo Zhu
通讯作者:
Shuqi Yang;Xingzhe He;Bo Zhu
DOI:
10.1109/cdc40024.2019.9029624
发表时间:
2019
期刊:
IEEE Conference on Decision and Control
影响因子:
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作者:
Lin, Jianping;Divekar, Nikhil;Lv, Ge;Gregg, Robert D.
通讯作者:
Gregg, Robert D.
DOI:
10.15607/rss.2020.xvi.099
发表时间:
2020
期刊:
Robotics science and systems
影响因子:
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作者:
Song, Changkyu;Boularias, Abdeslam
通讯作者:
Boularias, Abdeslam
影响因子:
12.9
作者:
Nicholls, Thomas P.;Constable, Grace E.;Bissember, Alex C.
通讯作者:
Bissember, Alex C.
DOI:
10.1063/5.0130803
发表时间:
2023
期刊:
Chaos (Woodbury, N.Y.)
影响因子:
--
作者:
Fronk,Colby;Petzold,Linda
通讯作者:
Petzold,Linda