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This paper describes a control strategy for throwing motion of the springed Pendubot based on the concept of unstable zero dynamics. An underactuated two-link planar robot called the Pendubot is investigated to realize dexterous actions of the superior limb in human throwing motion. A torsion spring is mounted on the passive joint of the Pendubot representing the flexibility of the cubital joint....
This paper describes a new trajectory planning method for the output tracking control of linear flexible systems; this method computes the exact solution of the equilibrium manifold. We establish a system of differential equations by combining kinematic and dynamic constraints and reformulate them in a singularly perturbed dynamics to obtain the equilibrium manifold in the form of an infinite series,...
The dynamic and friction parameters of a redundantly actuated parallel manipulator are identified by using the weighted least square (WLS) method. The dynamic model with nonlinear friction is formulated in the joint space for the parallel manipulator, and it is expressed in its linear matrix form with respect to the dynamic and friction parameters. In the WLS method, the difference algorithm of joint...
Safe mobility of the disabled is one of the major reasons for the study of electric powered wheelchairs. To achieve absolute safety - where possible accident is not attributed to by the user's inability, the wheelchair should be as easy as possible to control in nearly every kind of environment. A reliable controller can only be designed from a reliable dynamic model. In this paper, consider a 3D...
The present paper proposes the motion planning based on “the dynamics shaping” for a robotic arm to hit the target robustly toward the desired direction, of which the concept is to shape the robot dynamics appropriately in order to accomplish the desired motion. According to the linear system theory, the positional error of the end-point converges onto near the singular vector corresponding to its...
In this paper we consider the motion planning and control problem of an underactuated 3DOF rigid body. The dynamics of a particular experimental setup as abstraction of the rotational degrees of freedom of a helicopter is studied. The virtual holonomic constraints approach serves as analytical tool to plan various periodic motions of the system, where a synchronization pattern among the generalized...
This paper aims at generating desired feedforward torque for a specified motion by reuse of time-series torque data acquired by the iterative learning control. The suggested method named motion-scale transformation realizes a motion to an arbitrarily specified posture of a two-DOF planar robot arm on the basis of arithmetical operations of time-series torque of only four motions. The algorism is theoretically...
A general-purpose solution scheme of inverse dynamics for link systems was developed on the basis of a finite element approach. It can not only deal with different types of configurations, such as open-loop, closed-loop, or multibranch link systems, but also with the elasticity of constituted links without the need to revise any part of the scheme. The main objective of this study is to extend the...
We extend simple models previously developed for humanoids to large push recovery. Using these simple models, we develop analytic decision surfaces that are functions of reference points, such as the center of mass and center of pressure, that predict whether or not a fall is inevitable. We explore three strategies for recovery: 1) using ankle torques, 2) moving internal joints, and 3) taking a step...
A new approach to trajectory synthesis and formulation of the inverse dynamics model of flexible structures for point to point motions with minimal high frequency component of the actuating torques (forces) is presented. Trajectories are synthesized such that the flexible structure comes to rest undeformed at the completion of motion. The developed method is based on the Trajectory Pattern Method...
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