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This paper presents a method for determining impact forces associated with an abrupt velocity change when a free-flying body comes into contact with another body. Hard impact is considered where deformation of the impacting surfaces is negligible. The proposed approach uses a discrete algebraic model of impact in conjunction with moment and tangential coefficients of restitution (CORs) to develop...
A nonlinear reference shaping method for manipulators which are operated in living environments is proposed. It generates an intermediate reference position, and it is combined with a control based on the virtual spring-damper hypothesis proposed by Arimoto et al. The initial acceleration is moderated by an intermediate reference position inserted between the original target and the current position...
Variational integrators are powerful tools for simulating constrained mechanical systems as well as computing optimal control strategies. While there are well-established methods to incorporate holonomic constraints in variational integrators, there have also been alternative suggestions that have appealing benefits in terms of computational efficiency. We compare the standard holonomic constraints...
We provide Lyapunov-based control laws that stabilize relative equilibria in a model consisting of particles that travel on the surface of a rotating sphere in a time-invariant flowfield. These control laws are of interest because they have applications in planetary-scale mobile sensing networks in air and sea. A rotating sphere is introduced so that the particles are subject to the Coriolis effect...
An adaptive friction compensator is proposed using the generalized Maxwell-slip (GMS) friction model, with a new, linearly-parameterized Stribeck function. It employs a polynomial equation that is linear-in-the-parameter to describe the nonlinear Stribeck effect in the GMS model, and simplifies the design of an adaptive friction compensator. The proposed compensator has a switching structure to accommodate...
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