平滑化された陰的接触ダイナミクスのための安全制御
Safety-Critical Control for Smoothed Implicit Contact Dynamics
接触を伴うタスクの安全制御を実現するため、平滑化パラメータの影響を解析し、接触力の近似誤差を考慮した離散時間制御バリア関数を提案した。
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著者: Haegu Lee, Yitaek Kim, Christoffer Sloth
分類: cs.RO
原文アブストラクト
Smoothed implicit contact dynamics enables gradient-based planning and control for contact-rich tasks without predefined mode sequences. However, safety-critical control remains challenging because implicit contact dynamics makes safety-filter design nontrivial. The smoothing parameter $\kappa$ relaxes contact complementarity constraints, which makes the dynamics smooth but affects the contact force. This paper provides a method for bounding the actual contact force despite the use of relaxed complementarity constraints. We show that constraint violations can be non-monotonic in $\kappa$. Smaller $\kappa$ reduces force-approximation error, but it does not necessarily improve safety performance. To address this issue, we introduce boundary-focused rollouts to screen $\kappa$ by comparing the safety margin with the approximation error. We then develop a discrete-time control barrier function (CBF) framework based on a first-order Taylor approximation of the implicitly defined contact force. To account for possible force under-prediction, we augment the resulting safety constraint with a fixed robust margin. Simulations on four contact-rich systems show that the proposed method eliminates force violations observed under a standard CBF.
