Nonlinear disturbance observer-based direct joint control for manipulation of a flexible payload with output constraints. (English) Zbl 1519.93123
Summary: This paper discusses a nonlinear direct joint control scheme for manipulation of a flexible payload by a single-arm system with disturbances, parametric uncertainty and output constraints. The flexible payload can be considered as an Euler-Bernoulli beam. The equations of the coupled rigid-flexible motion are established on the basis of the ordinary differential equations (ODEs) and partial differential equation (PDE), which can avoid system spillover instability. A novel nonlinear disturbance observer-based control approach is proposed to enhance its disturbance attenuation ability. To handle the system parametric uncertainty, we apply adaptive direct joint control to approximate the unknown parameter, which does not require endpoint boundary control. Then a barrier Lyapunov function (BLF) is adopted to eliminate the impact of output restriction. The asymptotic stability of the closed-loop system is rigorously proven by semi-group theory and LaSalle’s invariance principle extended to an infinite-dimensional system. Finally, the performance of the direct joint control is validated via numerical simulations.
MSC:
| 93C40 | Adaptive control/observation systems |
| 93B53 | Observers |
| 93C15 | Control/observation systems governed by ordinary differential equations |
| 93C20 | Control/observation systems governed by partial differential equations |
| 93D20 | Asymptotic stability in control theory |
| 93C10 | Nonlinear systems in control theory |
Keywords:
nonlinear disturbance observer; adaptive control; output constraints; direct joint control; distributed parameter systemReferences:
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