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This talk will outline a comprehensive set of modeling, analysis and design techniques for a class of mechanical systems. We concern ourselves with simple mechanical control systems, that is, systems whose Lagrangian is kinetic energy minus potential energy. Example devices include robotic manipulators, aerospace and underwater vehicles, and mechanisms that… (More)

- Andrew D. Lewis, Richard M. Murray
- SIAM Review
- 1999

In this paper we present a definition of " configuration controllability " for mechanical systems whose Lagrangian is kinetic energy with respect to a Riemannian metric minus potential energy. A computable test for this new version of controllability is derived. This condition involves an object that we call the symmetric product. Of particular interest is… (More)

- Francesco Bullo, Naomi Ehrich Leonard, Andrew D. Lewis
- IEEE Trans. Automat. Contr.
- 2000

In this paper, we provide controllability tests and motion control algorithms for under-actuated mechanical control systems on Lie groups with Lagrangian equal to kinetic energy. Examples include satellite and underwater vehicle control systems with the number of control inputs less than the dimension of the configuration space. Local controllability… (More)

- Andrew D. Lewis
- IEEE Trans. Automat. Contr.
- 2000

Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE Abstract We apply some recently… (More)

In this paper we present a deenition of \connguration controllability" for mechanical systems whose Lagrangian is kinetic energy with respect to a Riemannian metric minus potential energy. A computable test for this new version of controllability is also derived. This condition involves a new object which we call the symmetric product. Of particular… (More)

- Francesco Bullo, Andrew D. Lewis
- SIAM J. Control and Optimization
- 2005

Controllability and kinematic modelling notions are investigated for a class of mechanical control systems. First, low-order controllability results are given for the class of mechanical control systems. Second, a precise connection is made between those mechanical systems which are dynamic (i.e., have forces as inputs) and those which are kinematic (i.e.,… (More)

- Francesco Bullo, Andrew D. Lewis
- IEEE Trans. Robotics and Automation
- 2003

— The snakeboard is shown to possess two de-coupling vector fields, and to be kinematically controllable. Accordingly, the problem of steering the snakeboard from a given configuration at rest to a desired configuration at rest is posed as a constrained static nonlinear inversion problem. An explicit algorithmic solution to the problem is provided, and its… (More)

In this paper we present two methods, the nonholonomic method and the vakonomic method, for deriving equations of motion for a mechanical system with constraints. The resulting equations are compared. Results are also presented from an experiment for a model system: a ball rolling without sliding on a rotating table. Both sets of equations of motion for the… (More)

- Ron M. Hirschorn, Andrew D. Lewis, R. M. Hirschorn
- 2002

In a geometric point of view, a nonlinear control system, affine in the controls, is thought of as an affine subbundle of the tangent bundle of the state space. In deriving conditions for local controllability from this point of view, one should describe those properties of the affine subbundle that either ensure or prohibit local controllability. In this… (More)