从物理原理出发构建新型摩擦模型,兼具可解释性与控制友好性。
First-order friction models with bristle dynamics: lumped and distributed formulations
- 基于毛刷元的物理机制,反推摩擦特性构建一阶动态模型
- 所提模型在稳定性与无源性上表现良好,支持控制器设计
- 提出分布参数版本,适用于滚动接触场景,实验验证有效
动态模型,尤其是速率依赖型模型,在捕捉摩擦过程的关键现象方面已证明有效,同时具备良好的数学性质,便于控制与估计算法的设计。然而,许多速率依赖模型基于经验假设,而物理推导则可能提供更强的可解释性。本文从基本物理原理出发,提出一类新型一阶动态摩擦模型,通过反转摩擦特性来近似毛刷元的动力学行为。其中,一种特定形式通过毛刷元的简单黏弹性方程推导得出,其结构与LuGre模型高度相似。该模型在稳定性与无源性方面进行了严格分析,这对观测器与控制器的综合至关重要。此外,还提出了一个分布参数版本,以双曲型偏微分方程(PDE)形式呈现,可用于建模常见的滚动接触摩擦现象。所提描述的摩擦学行为通过经典实验进行评估,并与LuGre模型预测结果对比,揭示出显著相似性与关键差异。
原文摘要 · Abstract (English)
Dynamic models, particularly rate-dependent models, have proven effective in capturing the key phenomenological features of frictional processes, whilst also possessing important mathematical properties that facilitate the design of control and estimation algorithms. However, many rate-dependent formulations are built on empirical considerations, whereas physical derivations may offer greater interpretability. In this context, starting from fundamental physical principles, this paper introduces a novel class of first-order dynamic friction models that approximate the dynamics of a bristle element by inverting the friction characteristic. Amongst the developed models, a specific formulation closely resembling the LuGre model is derived using a simple rheological equation for the bristle element. This model is rigorously analyzed in terms of stability and passivity -- important properties that support the synthesis of observers and controllers. Furthermore, a distributed version, formulated as a hyperbolic partial differential equation (PDE), is presented, which enables the modeling of frictional processes commonly encountered in rolling contact phenomena. The tribological behavior of the proposed description is evaluated through classical experiments and validated against the response predicted by the LuGre model, revealing both notable similarities and key differences.
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