一般化運動量に基づくKoopman形式によるEuler-Lagrangian系のロバスト制御
Generalized Momenta-Based Koopman Formalism for Robust Control of Euler-Lagrangian Systems
Euler-Lagrangian系に対して一般化運動量を用いたKoopman表現を提案し、非駆動部のみを学習することでデータ効率と予測性能を向上させ、GESOで外乱補償する制御手法を開発した。
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著者: Rajpal Singh, Aditya Singh, Chidre Shravista Kashyap, Jishnu Keshavan
分類: cs.RO, cs.SY, eess.SY
原文アブストラクト
This paper presents a novel Koopman operator formulation for Euler Lagrangian dynamics that employs an implicit generalized momentum-based state space representation, which decouples a known linear actuation channel from state dependent dynamics and makes the system more amenable to linear Koopman modeling. By leveraging this structural separation, the proposed formulation only requires to learn the unactuated dynamics rather than the complete actuation dependent system, thereby significantly reducing the number of learnable parameters, improving data efficiency, and lowering overall model complexity. In contrast, conventional explicit formulations inherently couple inputs with the state dependent terms in a nonlinear manner, making them more suitable for bilinear Koopman models, which are more computationally expensive to train and deploy. Notably, the proposed scheme enables the formulation of linear models that achieve superior prediction performance compared to conventional bilinear models while remaining substantially more efficient. To realize this framework, we present two neural network architectures that construct Koopman embeddings from actuated or unactuated data, enabling flexible and efficient modeling across different tasks. Robustness is ensured through the integration of a linear Generalized Extended State Observer (GESO), which explicitly estimates disturbances and compensates for them in real time. The combined momentum-based Koopman and GESO framework is validated through comprehensive trajectory tracking simulations and experiments on robotic manipulators, demonstrating superior accuracy, robustness, and learning efficiency relative to state of the art alternatives.
